pipeline.c

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/*  
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2006 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <math.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>

#include "DNA_group_types.h"
#include "DNA_image_types.h"
#include "DNA_node_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_sequence_types.h"
#include "DNA_userdef_types.h"

#include "MEM_guardedalloc.h"

#include "BKE_animsys.h"        /* <------ should this be here?, needed for sequencer update */
#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_main.h"
#include "BKE_node.h"
#include "BKE_object.h"
#include "BKE_pointcache.h"
#include "BKE_report.h"
#include "BKE_scene.h"
#include "BKE_sequencer.h"
#include "BKE_utildefines.h"
#include "BKE_writeavi.h"       /* <------ should be replaced once with generic movie module */

#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_rand.h"
#include "BLI_threads.h"
#include "BLI_callbacks.h"
#include "BLI_utildefines.h"

#include "PIL_time.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"

#include "intern/openexr/openexr_multi.h"

#include "RE_pipeline.h"

/* internal */
#include "render_types.h"
#include "renderpipeline.h"
#include "renderdatabase.h"
#include "rendercore.h"
#include "envmap.h"
#include "initrender.h"
#include "shadbuf.h"
#include "pixelblending.h"
#include "zbuf.h"


/* render flow

1) Initialize state
- state data, tables
- movie/image file init
- everything that doesn't change during animation

2) Initialize data
- camera, world, matrices
- make render verts, faces, halos, strands
- everything can change per frame/field

3) Render Processor
- multiple layers
- tiles, rect, baking
- layers/tiles optionally to disk or directly in Render Result

4) Composite Render Result
- also read external files etc

5) Image Files
- save file or append in movie

*/


/* ********* globals ******** */

/* here we store all renders */
static struct {
        ListBase renderlist;

        /* commandline thread override */
        int threads;
} RenderGlobal = {{NULL, NULL}, -1}; 

/* hardcopy of current render, used while rendering for speed */
Render R;

/* ********* alloc and free ******** */

static int do_write_image_or_movie(Render *re, Scene *scene, bMovieHandle *mh, const char *name_override);

static volatile int g_break= 0;
static int thread_break(void *UNUSED(arg))
{
        return g_break;
}

/* default callbacks, set in each new render */
static void result_nothing(void *UNUSED(arg), RenderResult *UNUSED(rr)) {}
static void result_rcti_nothing(void *UNUSED(arg), RenderResult *UNUSED(rr), volatile struct rcti *UNUSED(rect)) {}
static void stats_nothing(void *UNUSED(arg), RenderStats *UNUSED(rs)) {}
static void float_nothing(void *UNUSED(arg), float UNUSED(val)) {}
static int default_break(void *UNUSED(arg)) {return G.afbreek == 1;}

static void stats_background(void *UNUSED(arg), RenderStats *rs)
{
        uintptr_t mem_in_use, mmap_in_use, peak_memory;
        float megs_used_memory, mmap_used_memory, megs_peak_memory;

        mem_in_use= MEM_get_memory_in_use();
        mmap_in_use= MEM_get_mapped_memory_in_use();
        peak_memory = MEM_get_peak_memory();

        megs_used_memory= (mem_in_use-mmap_in_use)/(1024.0*1024.0);
        mmap_used_memory= (mmap_in_use)/(1024.0*1024.0);
        megs_peak_memory = (peak_memory)/(1024.0*1024.0);

        fprintf(stdout, "Fra:%d Mem:%.2fM (%.2fM, peak %.2fM) ", rs->cfra,
                                   megs_used_memory, mmap_used_memory, megs_peak_memory);

        if(rs->curfield)
                fprintf(stdout, "Field %d ", rs->curfield);
        if(rs->curblur)
                fprintf(stdout, "Blur %d ", rs->curblur);

        if(rs->infostr) {
                fprintf(stdout, "| %s", rs->infostr);
        }
        else {
                if(rs->tothalo)
                        fprintf(stdout, "Sce: %s Ve:%d Fa:%d Ha:%d La:%d", rs->scenename, rs->totvert, rs->totface, rs->tothalo, rs->totlamp);
                else
                        fprintf(stdout, "Sce: %s Ve:%d Fa:%d La:%d", rs->scenename, rs->totvert, rs->totface, rs->totlamp);
        }
        fputc('\n', stdout);
        fflush(stdout);
}

void RE_FreeRenderResult(RenderResult *res)
{
        if(res==NULL) return;

        while(res->layers.first) {
                RenderLayer *rl= res->layers.first;
                
                if(rl->rectf) MEM_freeN(rl->rectf);
                /* acolrect and scolrect are optionally allocated in shade_tile, only free here since it can be used for drawing */
                if(rl->acolrect) MEM_freeN(rl->acolrect);
                if(rl->scolrect) MEM_freeN(rl->scolrect);
                
                while(rl->passes.first) {
                        RenderPass *rpass= rl->passes.first;
                        if(rpass->rect) MEM_freeN(rpass->rect);
                        BLI_remlink(&rl->passes, rpass);
                        MEM_freeN(rpass);
                }
                BLI_remlink(&res->layers, rl);
                MEM_freeN(rl);
        }
        
        if(res->rect32)
                MEM_freeN(res->rect32);
        if(res->rectz)
                MEM_freeN(res->rectz);
        if(res->rectf)
                MEM_freeN(res->rectf);
        if(res->text)
                MEM_freeN(res->text);
        
        MEM_freeN(res);
}

/* version that's compatible with fullsample buffers */
static void free_render_result(ListBase *lb, RenderResult *rr)
{
        RenderResult *rrnext;
        
        for(; rr; rr= rrnext) {
                rrnext= rr->next;
                
                if(lb && lb->first)
                        BLI_remlink(lb, rr);
                
                RE_FreeRenderResult(rr);
        }
}


/* all layers except the active one get temporally pushed away */
static void push_render_result(Render *re)
{
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        /* officially pushed result should be NULL... error can happen with do_seq */
        RE_FreeRenderResult(re->pushedresult);
        
        re->pushedresult= re->result;
        re->result= NULL;

        BLI_rw_mutex_unlock(&re->resultmutex);
}

/* if scemode is R_SINGLE_LAYER, at end of rendering, merge the both render results */
static void pop_render_result(Render *re)
{
        if(re->result==NULL) {
                printf("pop render result error; no current result!\n");
                return;
        }

        if(re->pushedresult) {
                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

                if(re->pushedresult->rectx==re->result->rectx && re->pushedresult->recty==re->result->recty) {
                        /* find which layer in pushedresult should be replaced */
                        SceneRenderLayer *srl;
                        RenderLayer *rlpush;
                        RenderLayer *rl= re->result->layers.first;
                        int nr;
                        
                        /* render result should be empty after this */
                        BLI_remlink(&re->result->layers, rl);
                        
                        /* reconstruct render result layers */
                        for(nr=0, srl= re->scene->r.layers.first; srl; srl= srl->next, nr++) {
                                if(nr==re->r.actlay)
                                        BLI_addtail(&re->result->layers, rl);
                                else {
                                        rlpush= RE_GetRenderLayer(re->pushedresult, srl->name);
                                        if(rlpush) {
                                                BLI_remlink(&re->pushedresult->layers, rlpush);
                                                BLI_addtail(&re->result->layers, rlpush);
                                        }
                                }
                        }
                }
                
                RE_FreeRenderResult(re->pushedresult);
                re->pushedresult= NULL;

                BLI_rw_mutex_unlock(&re->resultmutex);
        }
}

/* NOTE: OpenEXR only supports 32 chars for layer+pass names
   In blender we now use max 10 chars for pass, max 20 for layer */
static const char *get_pass_name(int passtype, int channel)
{
        
        if(passtype == SCE_PASS_COMBINED) {
                if(channel==-1) return "Combined";
                if(channel==0) return "Combined.R";
                if(channel==1) return "Combined.G";
                if(channel==2) return "Combined.B";
                return "Combined.A";
        }
        if(passtype == SCE_PASS_Z) {
                if(channel==-1) return "Depth";
                return "Depth.Z";
        }
        if(passtype == SCE_PASS_VECTOR) {
                if(channel==-1) return "Vector";
                if(channel==0) return "Vector.X";
                if(channel==1) return "Vector.Y";
                if(channel==2) return "Vector.Z";
                return "Vector.W";
        }
        if(passtype == SCE_PASS_NORMAL) {
                if(channel==-1) return "Normal";
                if(channel==0) return "Normal.X";
                if(channel==1) return "Normal.Y";
                return "Normal.Z";
        }
        if(passtype == SCE_PASS_UV) {
                if(channel==-1) return "UV";
                if(channel==0) return "UV.U";
                if(channel==1) return "UV.V";
                return "UV.A";
        }
        if(passtype == SCE_PASS_RGBA) {
                if(channel==-1) return "Color";
                if(channel==0) return "Color.R";
                if(channel==1) return "Color.G";
                if(channel==2) return "Color.B";
                return "Color.A";
        }
        if(passtype == SCE_PASS_EMIT) {
                if(channel==-1) return "Emit";
                if(channel==0) return "Emit.R";
                if(channel==1) return "Emit.G";
                return "Emit.B";
        }
        if(passtype == SCE_PASS_DIFFUSE) {
                if(channel==-1) return "Diffuse";
                if(channel==0) return "Diffuse.R";
                if(channel==1) return "Diffuse.G";
                return "Diffuse.B";
        }
        if(passtype == SCE_PASS_SPEC) {
                if(channel==-1) return "Spec";
                if(channel==0) return "Spec.R";
                if(channel==1) return "Spec.G";
                return "Spec.B";
        }
        if(passtype == SCE_PASS_SHADOW) {
                if(channel==-1) return "Shadow";
                if(channel==0) return "Shadow.R";
                if(channel==1) return "Shadow.G";
                return "Shadow.B";
        }
        if(passtype == SCE_PASS_AO) {
                if(channel==-1) return "AO";
                if(channel==0) return "AO.R";
                if(channel==1) return "AO.G";
                return "AO.B";
        }
        if(passtype == SCE_PASS_ENVIRONMENT) {
                if(channel==-1) return "Env";
                if(channel==0) return "Env.R";
                if(channel==1) return "Env.G";
                return "Env.B";
        }
        if(passtype == SCE_PASS_INDIRECT) {
                if(channel==-1) return "Indirect";
                if(channel==0) return "Indirect.R";
                if(channel==1) return "Indirect.G";
                return "Indirect.B";
        }
        if(passtype == SCE_PASS_REFLECT) {
                if(channel==-1) return "Reflect";
                if(channel==0) return "Reflect.R";
                if(channel==1) return "Reflect.G";
                return "Reflect.B";
        }
        if(passtype == SCE_PASS_REFRACT) {
                if(channel==-1) return "Refract";
                if(channel==0) return "Refract.R";
                if(channel==1) return "Refract.G";
                return "Refract.B";
        }
        if(passtype == SCE_PASS_INDEXOB) {
                if(channel==-1) return "IndexOB";
                return "IndexOB.X";
        }
        if(passtype == SCE_PASS_INDEXMA) {
                if(channel==-1) return "IndexMA";
                return "IndexMA.X";
        }
        if(passtype == SCE_PASS_MIST) {
                if(channel==-1) return "Mist";
                return "Mist.Z";
        }
        if(passtype == SCE_PASS_RAYHITS)
        {
                if(channel==-1) return "Rayhits";
                if(channel==0) return "Rayhits.R";
                if(channel==1) return "Rayhits.G";
                return "Rayhits.B";
        }
        return "Unknown";
}

static int passtype_from_name(char *str)
{
        
        if(strcmp(str, "Combined")==0)
                return SCE_PASS_COMBINED;

        if(strcmp(str, "Depth")==0)
                return SCE_PASS_Z;

        if(strcmp(str, "Vector")==0)
                return SCE_PASS_VECTOR;

        if(strcmp(str, "Normal")==0)
                return SCE_PASS_NORMAL;

        if(strcmp(str, "UV")==0)
                return SCE_PASS_UV;

        if(strcmp(str, "Color")==0)
                return SCE_PASS_RGBA;

        if(strcmp(str, "Emit")==0)
                return SCE_PASS_EMIT;

        if(strcmp(str, "Diffuse")==0)
                return SCE_PASS_DIFFUSE;

        if(strcmp(str, "Spec")==0)
                return SCE_PASS_SPEC;

        if(strcmp(str, "Shadow")==0)
                return SCE_PASS_SHADOW;
        
        if(strcmp(str, "AO")==0)
                return SCE_PASS_AO;

        if(strcmp(str, "Env")==0)
                return SCE_PASS_ENVIRONMENT;

        if(strcmp(str, "Indirect")==0)
                return SCE_PASS_INDIRECT;

        if(strcmp(str, "Reflect")==0)
                return SCE_PASS_REFLECT;

        if(strcmp(str, "Refract")==0)
                return SCE_PASS_REFRACT;

        if(strcmp(str, "IndexOB")==0)
                return SCE_PASS_INDEXOB;

        if(strcmp(str, "IndexMA")==0)
                return SCE_PASS_INDEXMA;

        if(strcmp(str, "Mist")==0)
                return SCE_PASS_MIST;
        
        if(strcmp(str, "RayHits")==0)
                return SCE_PASS_RAYHITS;
        return 0;
}

static void scene_unique_exr_name(Scene *scene, char *str, int sample)
{
        char di[FILE_MAX], name[FILE_MAXFILE+MAX_ID_NAME+100], fi[FILE_MAXFILE];
        
        BLI_strncpy(di, G.main->name, FILE_MAX);
        BLI_splitdirstring(di, fi);
        
        if(sample==0)
                BLI_snprintf(name, sizeof(name), "%s_%s.exr", fi, scene->id.name+2);
        else
                BLI_snprintf(name, sizeof(name), "%s_%s%d.exr", fi, scene->id.name+2, sample);

        BLI_make_file_string("/", str, btempdir, name);
}

static void render_unique_exr_name(Render *re, char *str, int sample)
{
        scene_unique_exr_name(re->scene, str, sample);
}

static void render_layer_add_pass(RenderResult *rr, RenderLayer *rl, int channels, int passtype)
{
        const char *typestr= get_pass_name(passtype, 0);
        RenderPass *rpass= MEM_callocN(sizeof(RenderPass), typestr);
        int rectsize= rr->rectx*rr->recty*channels;
        
        BLI_addtail(&rl->passes, rpass);
        rpass->passtype= passtype;
        rpass->channels= channels;
        rpass->rectx= rl->rectx;
        rpass->recty= rl->recty;
        
        if(rr->exrhandle) {
                int a;
                for(a=0; a<channels; a++)
                        IMB_exr_add_channel(rr->exrhandle, rl->name, get_pass_name(passtype, a), 0, 0, NULL);
        }
        else {
                float *rect;
                int x;
                
                rpass->rect= MEM_mapallocN(sizeof(float)*rectsize, typestr);
                
                if(passtype==SCE_PASS_VECTOR) {
                        /* initialize to max speed */
                        rect= rpass->rect;
                        for(x= rectsize-1; x>=0; x--)
                                rect[x]= PASS_VECTOR_MAX;
                }
                else if(passtype==SCE_PASS_Z) {
                        rect= rpass->rect;
                        for(x= rectsize-1; x>=0; x--)
                                rect[x]= 10e10;
                }
        }
}

float *RE_RenderLayerGetPass(RenderLayer *rl, int passtype)
{
        RenderPass *rpass;
        
        for(rpass=rl->passes.first; rpass; rpass= rpass->next)
                if(rpass->passtype== passtype)
                        return rpass->rect;
        return NULL;
}

RenderLayer *RE_GetRenderLayer(RenderResult *rr, const char *name)
{
        RenderLayer *rl;
        
        if(rr==NULL) return NULL;
        
        for(rl= rr->layers.first; rl; rl= rl->next)
                if(strncmp(rl->name, name, RE_MAXNAME)==0)
                        return rl;
        return NULL;
}

#define RR_USEMEM       0
/* called by main render as well for parts */
/* will read info from Render *re to define layers */
/* called in threads */
/* re->winx,winy is coordinate space of entire image, partrct the part within */
static RenderResult *new_render_result(Render *re, rcti *partrct, int crop, int savebuffers)
{
        RenderResult *rr;
        RenderLayer *rl;
        SceneRenderLayer *srl;
        int rectx, recty, nr;
        
        rectx= partrct->xmax - partrct->xmin;
        recty= partrct->ymax - partrct->ymin;
        
        if(rectx<=0 || recty<=0)
                return NULL;
        
        rr= MEM_callocN(sizeof(RenderResult), "new render result");
        rr->rectx= rectx;
        rr->recty= recty;
        rr->renrect.xmin= 0; rr->renrect.xmax= rectx-2*crop;
        /* crop is one or two extra pixels rendered for filtering, is used for merging and display too */
        rr->crop= crop;
        
        /* tilerect is relative coordinates within render disprect. do not subtract crop yet */
        rr->tilerect.xmin= partrct->xmin - re->disprect.xmin;
        rr->tilerect.xmax= partrct->xmax - re->disprect.xmax;
        rr->tilerect.ymin= partrct->ymin - re->disprect.ymin;
        rr->tilerect.ymax= partrct->ymax - re->disprect.ymax;
        
        if(savebuffers) {
                rr->exrhandle= IMB_exr_get_handle();
        }
        
        /* check renderdata for amount of layers */
        for(nr=0, srl= re->r.layers.first; srl; srl= srl->next, nr++) {
                
                if((re->r.scemode & R_SINGLE_LAYER) && nr!=re->r.actlay)
                        continue;
                if(srl->layflag & SCE_LAY_DISABLE)
                        continue;
                
                rl= MEM_callocN(sizeof(RenderLayer), "new render layer");
                BLI_addtail(&rr->layers, rl);
                
                BLI_strncpy(rl->name, srl->name, sizeof(rl->name));
                rl->lay= srl->lay;
                rl->lay_zmask= srl->lay_zmask;
                rl->layflag= srl->layflag;
                rl->passflag= srl->passflag; // for debugging: srl->passflag|SCE_PASS_RAYHITS;
                rl->pass_xor= srl->pass_xor;
                rl->light_override= srl->light_override;
                rl->mat_override= srl->mat_override;
                rl->rectx= rectx;
                rl->recty= recty;
                
                if(rr->exrhandle) {
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.R", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.G", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.B", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.A", 0, 0, NULL);
                }
                else
                        rl->rectf= MEM_mapallocN(rectx*recty*sizeof(float)*4, "Combined rgba");
                
                if(srl->passflag  & SCE_PASS_Z)
                        render_layer_add_pass(rr, rl, 1, SCE_PASS_Z);
                if(srl->passflag  & SCE_PASS_VECTOR)
                        render_layer_add_pass(rr, rl, 4, SCE_PASS_VECTOR);
                if(srl->passflag  & SCE_PASS_NORMAL)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_NORMAL);
                if(srl->passflag  & SCE_PASS_UV) 
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_UV);
                if(srl->passflag  & SCE_PASS_RGBA)
                        render_layer_add_pass(rr, rl, 4, SCE_PASS_RGBA);
                if(srl->passflag  & SCE_PASS_EMIT)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_EMIT);
                if(srl->passflag  & SCE_PASS_DIFFUSE)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_DIFFUSE);
                if(srl->passflag  & SCE_PASS_SPEC)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_SPEC);
                if(srl->passflag  & SCE_PASS_AO)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_AO);
                if(srl->passflag  & SCE_PASS_ENVIRONMENT)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_ENVIRONMENT);
                if(srl->passflag  & SCE_PASS_INDIRECT)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_INDIRECT);
                if(srl->passflag  & SCE_PASS_SHADOW)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_SHADOW);
                if(srl->passflag  & SCE_PASS_REFLECT)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_REFLECT);
                if(srl->passflag  & SCE_PASS_REFRACT)
                        render_layer_add_pass(rr, rl, 3, SCE_PASS_REFRACT);
                if(srl->passflag  & SCE_PASS_INDEXOB)
                        render_layer_add_pass(rr, rl, 1, SCE_PASS_INDEXOB);
                if(srl->passflag  & SCE_PASS_INDEXMA)
                        render_layer_add_pass(rr, rl, 1, SCE_PASS_INDEXMA);
                if(srl->passflag  & SCE_PASS_MIST)
                        render_layer_add_pass(rr, rl, 1, SCE_PASS_MIST);
                if(rl->passflag & SCE_PASS_RAYHITS)
                        render_layer_add_pass(rr, rl, 4, SCE_PASS_RAYHITS);
                
        }
        /* sss, previewrender and envmap don't do layers, so we make a default one */
        if(rr->layers.first==NULL) {
                rl= MEM_callocN(sizeof(RenderLayer), "new render layer");
                BLI_addtail(&rr->layers, rl);
                
                rl->rectx= rectx;
                rl->recty= recty;

                /* duplicate code... */
                if(rr->exrhandle) {
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.R", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.G", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.B", 0, 0, NULL);
                        IMB_exr_add_channel(rr->exrhandle, rl->name, "Combined.A", 0, 0, NULL);
                }
                else
                        rl->rectf= MEM_mapallocN(rectx*recty*sizeof(float)*4, "Combined rgba");
                
                /* note, this has to be in sync with scene.c */
                rl->lay= (1<<20) -1;
                rl->layflag= 0x7FFF;    /* solid ztra halo strand */
                rl->passflag= SCE_PASS_COMBINED;
                
                re->r.actlay= 0;
        }
        
        /* border render; calculate offset for use in compositor. compo is centralized coords */
        rr->xof= re->disprect.xmin + (re->disprect.xmax - re->disprect.xmin)/2 - re->winx/2;
        rr->yof= re->disprect.ymin + (re->disprect.ymax - re->disprect.ymin)/2 - re->winy/2;
        
        return rr;
}

static int render_scene_needs_vector(Render *re)
{
        SceneRenderLayer *srl;
        
        for(srl= re->scene->r.layers.first; srl; srl= srl->next)
                if(!(srl->layflag & SCE_LAY_DISABLE))
                        if(srl->passflag & SCE_PASS_VECTOR)
                                return 1;

        return 0;
}

static void do_merge_tile(RenderResult *rr, RenderResult *rrpart, float *target, float *tile, int pixsize)
{
        int y, ofs, copylen, tilex, tiley;
        
        copylen= tilex= rrpart->rectx;
        tiley= rrpart->recty;
        
        if(rrpart->crop) {      /* filters add pixel extra */
                tile+= pixsize*(rrpart->crop + rrpart->crop*tilex);
                
                copylen= tilex - 2*rrpart->crop;
                tiley -= 2*rrpart->crop;
                
                ofs= (rrpart->tilerect.ymin + rrpart->crop)*rr->rectx + (rrpart->tilerect.xmin+rrpart->crop);
                target+= pixsize*ofs;
        }
        else {
                ofs= (rrpart->tilerect.ymin*rr->rectx + rrpart->tilerect.xmin);
                target+= pixsize*ofs;
        }

        copylen *= sizeof(float)*pixsize;
        tilex *= pixsize;
        ofs= pixsize*rr->rectx;

        for(y=0; y<tiley; y++) {
                memcpy(target, tile, copylen);
                target+= ofs;
                tile+= tilex;
        }
}

/* used when rendering to a full buffer, or when reading the exr part-layer-pass file */
/* no test happens here if it fits... we also assume layers are in sync */
/* is used within threads */
static void merge_render_result(RenderResult *rr, RenderResult *rrpart)
{
        RenderLayer *rl, *rlp;
        RenderPass *rpass, *rpassp;
        
        for(rl= rr->layers.first, rlp= rrpart->layers.first; rl && rlp; rl= rl->next, rlp= rlp->next) {
                
                /* combined */
                if(rl->rectf && rlp->rectf)
                        do_merge_tile(rr, rrpart, rl->rectf, rlp->rectf, 4);
                
                /* passes are allocated in sync */
                for(rpass= rl->passes.first, rpassp= rlp->passes.first; rpass && rpassp; rpass= rpass->next, rpassp= rpassp->next) {
                        do_merge_tile(rr, rrpart, rpass->rect, rpassp->rect, rpass->channels);
                }
        }
}


static void save_render_result_tile(RenderResult *rr, RenderResult *rrpart)
{
        RenderLayer *rlp;
        RenderPass *rpassp;
        int offs, partx, party;
        
        BLI_lock_thread(LOCK_IMAGE);
        
        for(rlp= rrpart->layers.first; rlp; rlp= rlp->next) {
                
                if(rrpart->crop) {      /* filters add pixel extra */
                        offs= (rrpart->crop + rrpart->crop*rrpart->rectx);
                }
                else {
                        offs= 0;
                }
                
                /* combined */
                if(rlp->rectf) {
                        int a, xstride= 4;
                        for(a=0; a<xstride; a++)
                                IMB_exr_set_channel(rr->exrhandle, rlp->name, get_pass_name(SCE_PASS_COMBINED, a), 
                                                                xstride, xstride*rrpart->rectx, rlp->rectf+a + xstride*offs);
                }
                
                /* passes are allocated in sync */
                for(rpassp= rlp->passes.first; rpassp; rpassp= rpassp->next) {
                        int a, xstride= rpassp->channels;
                        for(a=0; a<xstride; a++)
                                IMB_exr_set_channel(rr->exrhandle, rlp->name, get_pass_name(rpassp->passtype, a), 
                                                                        xstride, xstride*rrpart->rectx, rpassp->rect+a + xstride*offs);
                }
                
        }

        party= rrpart->tilerect.ymin + rrpart->crop;
        partx= rrpart->tilerect.xmin + rrpart->crop;
        IMB_exrtile_write_channels(rr->exrhandle, partx, party, 0);

        BLI_unlock_thread(LOCK_IMAGE);

}

static void save_empty_result_tiles(Render *re)
{
        RenderPart *pa;
        RenderResult *rr;
        
        for(rr= re->result; rr; rr= rr->next) {
                IMB_exrtile_clear_channels(rr->exrhandle);
                
                for(pa= re->parts.first; pa; pa= pa->next) {
                        if(pa->ready==0) {
                                int party= pa->disprect.ymin - re->disprect.ymin + pa->crop;
                                int partx= pa->disprect.xmin - re->disprect.xmin + pa->crop;
                                IMB_exrtile_write_channels(rr->exrhandle, partx, party, 0);
                        }
                }
        }
}


/* for passes read from files, these have names stored */
static char *make_pass_name(RenderPass *rpass, int chan)
{
        static char name[16];
        int len;
        
        BLI_strncpy(name, rpass->name, EXR_PASS_MAXNAME);
        len= strlen(name);
        name[len]= '.';
        name[len+1]= rpass->chan_id[chan];
        name[len+2]= 0;

        return name;
}

/* filename already made absolute */
/* called from within UI, saves both rendered result as a file-read result */
void RE_WriteRenderResult(RenderResult *rr, const char *filename, int compress)
{
        RenderLayer *rl;
        RenderPass *rpass;
        void *exrhandle= IMB_exr_get_handle();

        BLI_make_existing_file(filename);
        
        /* composite result */
        if(rr->rectf) {
                IMB_exr_add_channel(exrhandle, "Composite", "Combined.R", 4, 4*rr->rectx, rr->rectf);
                IMB_exr_add_channel(exrhandle, "Composite", "Combined.G", 4, 4*rr->rectx, rr->rectf+1);
                IMB_exr_add_channel(exrhandle, "Composite", "Combined.B", 4, 4*rr->rectx, rr->rectf+2);
                IMB_exr_add_channel(exrhandle, "Composite", "Combined.A", 4, 4*rr->rectx, rr->rectf+3);
        }
        
        /* add layers/passes and assign channels */
        for(rl= rr->layers.first; rl; rl= rl->next) {
                
                /* combined */
                if(rl->rectf) {
                        int a, xstride= 4;
                        for(a=0; a<xstride; a++)
                                IMB_exr_add_channel(exrhandle, rl->name, get_pass_name(SCE_PASS_COMBINED, a), 
                                                                        xstride, xstride*rr->rectx, rl->rectf+a);
                }
                
                /* passes are allocated in sync */
                for(rpass= rl->passes.first; rpass; rpass= rpass->next) {
                        int a, xstride= rpass->channels;
                        for(a=0; a<xstride; a++) {
                                if(rpass->passtype)
                                        IMB_exr_add_channel(exrhandle, rl->name, get_pass_name(rpass->passtype, a), 
                                                                                xstride, xstride*rr->rectx, rpass->rect+a);
                                else
                                        IMB_exr_add_channel(exrhandle, rl->name, make_pass_name(rpass, a), 
                                                                                xstride, xstride*rr->rectx, rpass->rect+a);
                        }
                }
        }
        
        IMB_exr_begin_write(exrhandle, filename, rr->rectx, rr->recty, compress);
        
        IMB_exr_write_channels(exrhandle);
        IMB_exr_close(exrhandle);
}

/* callbacks for RE_MultilayerConvert */
static void *ml_addlayer_cb(void *base, char *str)
{
        RenderResult *rr= base;
        RenderLayer *rl;
        
        rl= MEM_callocN(sizeof(RenderLayer), "new render layer");
        BLI_addtail(&rr->layers, rl);
        
        BLI_strncpy(rl->name, str, EXR_LAY_MAXNAME);
        return rl;
}
static void ml_addpass_cb(void *UNUSED(base), void *lay, char *str, float *rect, int totchan, char *chan_id)
{
        RenderLayer *rl= lay;   
        RenderPass *rpass= MEM_callocN(sizeof(RenderPass), "loaded pass");
        int a;
        
        BLI_addtail(&rl->passes, rpass);
        rpass->channels= totchan;

        rpass->passtype= passtype_from_name(str);
        if(rpass->passtype==0) printf("unknown pass %s\n", str);
        rl->passflag |= rpass->passtype;
        
        BLI_strncpy(rpass->name, str, EXR_PASS_MAXNAME);
        /* channel id chars */
        for(a=0; a<totchan; a++)
                rpass->chan_id[a]= chan_id[a];
        
        rpass->rect= rect;
}

/* from imbuf, if a handle was returned we convert this to render result */
RenderResult *RE_MultilayerConvert(void *exrhandle, int rectx, int recty)
{
        RenderResult *rr= MEM_callocN(sizeof(RenderResult), "loaded render result");
        RenderLayer *rl;
        RenderPass *rpass;
        
        rr->rectx= rectx;
        rr->recty= recty;
        
        IMB_exr_multilayer_convert(exrhandle, rr, ml_addlayer_cb, ml_addpass_cb);

        for(rl=rr->layers.first; rl; rl=rl->next) {
                rl->rectx= rectx;
                rl->recty= recty;

                for(rpass=rl->passes.first; rpass; rpass=rpass->next) {
                        rpass->rectx= rectx;
                        rpass->recty= recty;
                }
        }
        
        return rr;
}

/* called in end of render, to add names to passes... for UI only */
static void renderresult_add_names(RenderResult *rr)
{
        RenderLayer *rl;
        RenderPass *rpass;
        
        for(rl= rr->layers.first; rl; rl= rl->next)
                for(rpass= rl->passes.first; rpass; rpass= rpass->next)
                        BLI_strncpy(rpass->name, get_pass_name(rpass->passtype, -1), sizeof(rpass->name));
}

/* called for reading temp files, and for external engines */
static int read_render_result_from_file(const char *filename, RenderResult *rr)
{
        RenderLayer *rl;
        RenderPass *rpass;
        void *exrhandle= IMB_exr_get_handle();
        int rectx, recty;

        if(IMB_exr_begin_read(exrhandle, filename, &rectx, &recty)==0) {
                printf("failed being read %s\n", filename);
                IMB_exr_close(exrhandle);
                return 0;
        }

        if(rr == NULL || rectx!=rr->rectx || recty!=rr->recty) {
                if(rr)
                        printf("error in reading render result: dimensions don't match\n");
                else
                        printf("error in reading render result: NULL result pointer\n");
                IMB_exr_close(exrhandle);
                return 0;
        }
        else {
                for(rl= rr->layers.first; rl; rl= rl->next) {
                        
                        /* combined */
                        if(rl->rectf) {
                                int a, xstride= 4;
                                for(a=0; a<xstride; a++)
                                        IMB_exr_set_channel(exrhandle, rl->name, get_pass_name(SCE_PASS_COMBINED, a), 
                                                                                xstride, xstride*rectx, rl->rectf+a);
                        }
                        
                        /* passes are allocated in sync */
                        for(rpass= rl->passes.first; rpass; rpass= rpass->next) {
                                int a, xstride= rpass->channels;
                                for(a=0; a<xstride; a++)
                                        IMB_exr_set_channel(exrhandle, rl->name, get_pass_name(rpass->passtype, a), 
                                                                                xstride, xstride*rectx, rpass->rect+a);
                        }
                        
                }
                IMB_exr_read_channels(exrhandle);
                renderresult_add_names(rr);
        }
        
        IMB_exr_close(exrhandle);

        return 1;
}

/* only for temp buffer files, makes exact copy of render result */
static void read_render_result(Render *re, int sample)
{
        char str[FILE_MAX];

        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        RE_FreeRenderResult(re->result);
        re->result= new_render_result(re, &re->disprect, 0, RR_USEMEM);

        render_unique_exr_name(re, str, sample);
        printf("read exr tmp file: %s\n", str);

        if(!read_render_result_from_file(str, re->result))
                printf("cannot read: %s\n", str);

        BLI_rw_mutex_unlock(&re->resultmutex);
}

/* *************************************************** */

Render *RE_GetRender(const char *name)
{
        Render *re;

        /* search for existing renders */
        for(re= RenderGlobal.renderlist.first; re; re= re->next)
                if(strncmp(re->name, name, RE_MAXNAME)==0)
                        break;

        return re;
}

/* if you want to know exactly what has been done */
RenderResult *RE_AcquireResultRead(Render *re)
{
        if(re) {
                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_READ);
                return re->result;
        }

        return NULL;
}

RenderResult *RE_AcquireResultWrite(Render *re)
{
        if(re) {
                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
                return re->result;
        }

        return NULL;
}

void RE_SwapResult(Render *re, RenderResult **rr)
{
        /* for keeping render buffers */
        if(re) {
                SWAP(RenderResult*, re->result, *rr);
        }
}


void RE_ReleaseResult(Render *re)
{
        if(re)
                BLI_rw_mutex_unlock(&re->resultmutex);
}

/* displist.c util.... */
Scene *RE_GetScene(Render *re)
{
        if(re)
                return re->scene;
        return NULL;
}

RenderLayer *render_get_active_layer(Render *re, RenderResult *rr)
{
        RenderLayer *rl= BLI_findlink(&rr->layers, re->r.actlay);
        
        if(rl) 
                return rl;
        else 
                return rr->layers.first;
}


/* fill provided result struct with what's currently active or done */
void RE_AcquireResultImage(Render *re, RenderResult *rr)
{
        memset(rr, 0, sizeof(RenderResult));

        if(re) {
                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_READ);

                if(re->result) {
                        RenderLayer *rl;
                        
                        rr->rectx= re->result->rectx;
                        rr->recty= re->result->recty;
                        
                        rr->rectf= re->result->rectf;
                        rr->rectz= re->result->rectz;
                        rr->rect32= re->result->rect32;
                        
                        /* active layer */
                        rl= render_get_active_layer(re, re->result);

                        if(rl) {
                                if(rr->rectf==NULL)
                                        rr->rectf= rl->rectf;
                                if(rr->rectz==NULL)
                                        rr->rectz= RE_RenderLayerGetPass(rl, SCE_PASS_Z);       
                        }

                        rr->have_combined= (re->result->rectf != NULL);
                        rr->layers= re->result->layers;
                }
        }
}

void RE_ReleaseResultImage(Render *re)
{
        if(re)
                BLI_rw_mutex_unlock(&re->resultmutex);
}

/* caller is responsible for allocating rect in correct size! */
void RE_ResultGet32(Render *re, unsigned int *rect)
{
        RenderResult rres;
        
        RE_AcquireResultImage(re, &rres);

        if(rres.rect32) 
                memcpy(rect, rres.rect32, sizeof(int)*rres.rectx*rres.recty);
        else if(rres.rectf) {
                float *fp= rres.rectf;
                int tot= rres.rectx*rres.recty;
                char *cp= (char *)rect;
                
                if (re->r.color_mgt_flag & R_COLOR_MANAGEMENT) {
                        /* Finally convert back to sRGB rendered image */ 
                        for(;tot>0; tot--, cp+=4, fp+=4) {
                                cp[0] = FTOCHAR(linearrgb_to_srgb(fp[0]));
                                cp[1] = FTOCHAR(linearrgb_to_srgb(fp[1]));
                                cp[2] = FTOCHAR(linearrgb_to_srgb(fp[2]));
                                cp[3] = FTOCHAR(fp[3]);
                        }
                }
                else {
                        /* Color management is off : no conversion necessary */
                        for(;tot>0; tot--, cp+=4, fp+=4) {
                                cp[0] = FTOCHAR(fp[0]);
                                cp[1] = FTOCHAR(fp[1]);
                                cp[2] = FTOCHAR(fp[2]);
                                cp[3] = FTOCHAR(fp[3]);
                        }
                }

        }
        else
                /* else fill with black */
                memset(rect, 0, sizeof(int)*re->rectx*re->recty);

        RE_ReleaseResultImage(re);
}

RenderStats *RE_GetStats(Render *re)
{
        return &re->i;
}

Render *RE_NewRender(const char *name)
{
        Render *re;

        /* only one render per name exists */
        re= RE_GetRender(name);
        if(re==NULL) {
                
                /* new render data struct */
                re= MEM_callocN(sizeof(Render), "new render");
                BLI_addtail(&RenderGlobal.renderlist, re);
                strncpy(re->name, name, RE_MAXNAME);
                BLI_rw_mutex_init(&re->resultmutex);
        }
        
        RE_InitRenderCB(re);

        /* init some variables */
        re->ycor= 1.0f;
        
        return re;
}

/* called for new renders and when finishing rendering so
 * we calways have valid callbacks on a render */
void RE_InitRenderCB(Render *re)
{
        /* set default empty callbacks */
        re->display_init= result_nothing;
        re->display_clear= result_nothing;
        re->display_draw= result_rcti_nothing;
        re->progress= float_nothing;
        re->test_break= default_break;
        if(G.background)
                re->stats_draw= stats_background;
        else
                re->stats_draw= stats_nothing;
        /* clear callback handles */
        re->dih= re->dch= re->ddh= re->sdh= re->prh= re->tbh= NULL;
}

/* only call this while you know it will remove the link too */
void RE_FreeRender(Render *re)
{
        BLI_rw_mutex_end(&re->resultmutex);
        
        free_renderdata_tables(re);
        free_sample_tables(re);
        
        RE_FreeRenderResult(re->result);
        RE_FreeRenderResult(re->pushedresult);
        
        BLI_remlink(&RenderGlobal.renderlist, re);
        MEM_freeN(re);
}

/* exit blender */
void RE_FreeAllRender(void)
{
        while(RenderGlobal.renderlist.first) {
                RE_FreeRender(RenderGlobal.renderlist.first);
        }
}

/* ********* initialize state ******** */


/* what doesn't change during entire render sequence */
/* disprect is optional, if NULL it assumes full window render */
void RE_InitState(Render *re, Render *source, RenderData *rd, SceneRenderLayer *srl, int winx, int winy, rcti *disprect)
{
        re->ok= TRUE;   /* maybe flag */
        
        re->i.starttime= PIL_check_seconds_timer();
        re->r= *rd;             /* hardcopy */
        
        re->winx= winx;
        re->winy= winy;
        if(disprect) {
                re->disprect= *disprect;
                re->rectx= disprect->xmax-disprect->xmin;
                re->recty= disprect->ymax-disprect->ymin;
        }
        else {
                re->disprect.xmin= re->disprect.ymin= 0;
                re->disprect.xmax= winx;
                re->disprect.ymax= winy;
                re->rectx= winx;
                re->recty= winy;
        }
        
        if(re->rectx < 2 || re->recty < 2 || (BKE_imtype_is_movie(rd->imtype) &&
                                                                                  (re->rectx < 16 || re->recty < 16) )) {
                BKE_report(re->reports, RPT_ERROR, "Image too small");
                re->ok= 0;
                return;
        }

        if((re->r.mode & (R_OSA))==0)
                re->r.scemode &= ~R_FULL_SAMPLE;

#ifdef WITH_OPENEXR
        if(re->r.scemode & R_FULL_SAMPLE)
                re->r.scemode |= R_EXR_TILE_FILE;       /* enable automatic */

        /* Until use_border is made compatible with save_buffers/full_sample, render without the later instead of not rendering at all.*/
        if(re->r.mode & R_BORDER) 
        {
                re->r.scemode &= ~(R_EXR_TILE_FILE|R_FULL_SAMPLE);
        }

#else
        /* can't do this without openexr support */
        re->r.scemode &= ~(R_EXR_TILE_FILE|R_FULL_SAMPLE);
#endif
        
        /* fullsample wants uniform osa levels */
        if(source && (re->r.scemode & R_FULL_SAMPLE)) {
                /* but, if source has no full sample we disable it */
                if((source->r.scemode & R_FULL_SAMPLE)==0)
                        re->r.scemode &= ~R_FULL_SAMPLE;
                else
                        re->r.osa= re->osa= source->osa;
        }
        else {
                /* check state variables, osa? */
                if(re->r.mode & (R_OSA)) {
                        re->osa= re->r.osa;
                        if(re->osa>16) re->osa= 16;
                }
                else re->osa= 0;
        }
        
        if (srl) {
                int index = BLI_findindex(&re->r.layers, srl);
                if (index != -1) {
                        re->r.actlay = index;
                        re->r.scemode |= R_SINGLE_LAYER;
                }
        }
                
        /* always call, checks for gamma, gamma tables and jitter too */
        make_sample_tables(re); 
        
        /* if preview render, we try to keep old result */
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        if(re->r.scemode & R_PREVIEWBUTS) {
                if(re->result && re->result->rectx==re->rectx && re->result->recty==re->recty);
                else {
                        RE_FreeRenderResult(re->result);
                        re->result= NULL;
                }
        }
        else {
                
                /* make empty render result, so display callbacks can initialize */
                RE_FreeRenderResult(re->result);
                re->result= MEM_callocN(sizeof(RenderResult), "new render result");
                re->result->rectx= re->rectx;
                re->result->recty= re->recty;
        }

        BLI_rw_mutex_unlock(&re->resultmutex);
        
        /* we clip faces with a minimum of 2 pixel boundary outside of image border. see zbuf.c */
        re->clipcrop= 1.0f + 2.0f/(float)(re->winx>re->winy?re->winy:re->winx);
        
        re->mblur_offs = re->field_offs = 0.f;
        
        RE_init_threadcount(re);
}

/* part of external api, not called for regular render pipeline */
void RE_SetDispRect (struct Render *re, rcti *disprect)
{
        re->disprect= *disprect;
        re->rectx= disprect->xmax-disprect->xmin;
        re->recty= disprect->ymax-disprect->ymin;
        
        /* initialize render result */
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        RE_FreeRenderResult(re->result);
        re->result= new_render_result(re, &re->disprect, 0, RR_USEMEM);

        BLI_rw_mutex_unlock(&re->resultmutex);
}

void RE_SetWindow(Render *re, rctf *viewplane, float clipsta, float clipend)
{
        /* re->ok flag? */
        
        re->viewplane= *viewplane;
        re->clipsta= clipsta;
        re->clipend= clipend;
        re->r.mode &= ~R_ORTHO;

        perspective_m4( re->winmat,re->viewplane.xmin, re->viewplane.xmax, re->viewplane.ymin, re->viewplane.ymax, re->clipsta, re->clipend);
        
}

void RE_SetOrtho(Render *re, rctf *viewplane, float clipsta, float clipend)
{
        /* re->ok flag? */
        
        re->viewplane= *viewplane;
        re->clipsta= clipsta;
        re->clipend= clipend;
        re->r.mode |= R_ORTHO;

        orthographic_m4( re->winmat,re->viewplane.xmin, re->viewplane.xmax, re->viewplane.ymin, re->viewplane.ymax, re->clipsta, re->clipend);
}

void RE_SetView(Render *re, float mat[][4])
{
        /* re->ok flag? */
        copy_m4_m4(re->viewmat, mat);
        invert_m4_m4(re->viewinv, re->viewmat);
}

/* image and movie output has to move to either imbuf or kernel */
void RE_display_init_cb(Render *re, void *handle, void (*f)(void *handle, RenderResult *rr))
{
        re->display_init= f;
        re->dih= handle;
}
void RE_display_clear_cb(Render *re, void *handle, void (*f)(void *handle, RenderResult *rr))
{
        re->display_clear= f;
        re->dch= handle;
}
void RE_display_draw_cb(Render *re, void *handle, void (*f)(void *handle, RenderResult *rr, volatile rcti *rect))
{
        re->display_draw= f;
        re->ddh= handle;
}
void RE_stats_draw_cb(Render *re, void *handle, void (*f)(void *handle, RenderStats *rs))
{
        re->stats_draw= f;
        re->sdh= handle;
}
void RE_progress_cb(Render *re, void *handle, void (*f)(void *handle, float))
{
        re->progress= f;
        re->prh= handle;
}

void RE_draw_lock_cb(Render *re, void *handle, void (*f)(void *handle, int i))
{
        re->draw_lock= f;
        re->tbh= handle;
}

void RE_test_break_cb(Render *re, void *handle, int (*f)(void *handle))
{
        re->test_break= f;
        re->tbh= handle;
}


/* ********* add object data (later) ******** */

/* object is considered fully prepared on correct time etc */
/* includes lights */
void RE_AddObject(Render *UNUSED(re), Object *UNUSED(ob))
{
        
}

/* *************************************** */

static int render_display_draw_enabled(Render *re)
{
        /* don't show preprocess for previewrender sss */
        if(re->sss_points)
                return !(re->r.scemode & R_PREVIEWBUTS);
        else
                return 1;
}

/* allocate osa new results for samples */
static RenderResult *new_full_sample_buffers(Render *re, ListBase *lb, rcti *partrct, int crop)
{
        int a;
        
        if(re->osa==0)
                return new_render_result(re, partrct, crop, RR_USEMEM);
        
        for(a=0; a<re->osa; a++) {
                RenderResult *rr= new_render_result(re, partrct, crop, RR_USEMEM);
                BLI_addtail(lb, rr);
                rr->sample_nr= a;
        }
        
        return lb->first;
}


/* the main thread call, renders an entire part */
static void *do_part_thread(void *pa_v)
{
        RenderPart *pa= pa_v;
        
        /* need to return nicely all parts on esc */
        if(R.test_break(R.tbh)==0) {
                
                if(!R.sss_points && (R.r.scemode & R_FULL_SAMPLE))
                        pa->result= new_full_sample_buffers(&R, &pa->fullresult, &pa->disprect, pa->crop);
                else
                        pa->result= new_render_result(&R, &pa->disprect, pa->crop, RR_USEMEM);

                if(R.sss_points)
                        zbufshade_sss_tile(pa);
                else if(R.osa)
                        zbufshadeDA_tile(pa);
                else
                        zbufshade_tile(pa);
                
                /* merge too on break! */
                if(R.result->exrhandle) {
                        RenderResult *rr, *rrpart;
                        
                        for(rr= R.result, rrpart= pa->result; rr && rrpart; rr= rr->next, rrpart= rrpart->next)
                                save_render_result_tile(rr, rrpart);
                        
                }
                else if(render_display_draw_enabled(&R)) {
                        /* on break, don't merge in result for preview renders, looks nicer */
                        if(R.test_break(R.tbh) && (R.r.scemode & R_PREVIEWBUTS));
                        else merge_render_result(R.result, pa->result);
                }
        }
        
        pa->ready= 1;
        
        return NULL;
}

/* calculus for how much 1 pixel rendered should rotate the 3d geometry */
/* is not that simple, needs to be corrected for errors of larger viewplane sizes */
/* called in initrender.c, initparts() and convertblender.c, for speedvectors */
float panorama_pixel_rot(Render *re)
{
        float psize, phi, xfac;
        float borderfac= (float)(re->disprect.xmax - re->disprect.xmin) / (float)re->winx;
        
        /* size of 1 pixel mapped to viewplane coords */
        psize= (re->viewplane.xmax-re->viewplane.xmin)/(float)(re->winx);
        /* angle of a pixel */
        phi= atan(psize/re->clipsta);
        
        /* correction factor for viewplane shifting, first calculate how much the viewplane angle is */
        xfac= borderfac*((re->viewplane.xmax-re->viewplane.xmin))/(float)re->xparts;
        xfac= atan(0.5f*xfac/re->clipsta); 
        /* and how much the same viewplane angle is wrapped */
        psize= 0.5f*phi*((float)re->partx);
        
        /* the ratio applied to final per-pixel angle */
        phi*= xfac/psize;
        
        return phi;
}

/* call when all parts stopped rendering, to find the next Y slice */
/* if slice found, it rotates the dbase */
static RenderPart *find_next_pano_slice(Render *re, int *minx, rctf *viewplane)
{
        RenderPart *pa, *best= NULL;
        
        *minx= re->winx;
        
        /* most left part of the non-rendering parts */
        for(pa= re->parts.first; pa; pa= pa->next) {
                if(pa->ready==0 && pa->nr==0) {
                        if(pa->disprect.xmin < *minx) {
                                best= pa;
                                *minx= pa->disprect.xmin;
                        }
                }
        }
                        
        if(best) {
                float phi= panorama_pixel_rot(re);

                R.panodxp= (re->winx - (best->disprect.xmin + best->disprect.xmax) )/2;
                R.panodxv= ((viewplane->xmax-viewplane->xmin)*R.panodxp)/(float)(re->winx);

                /* shift viewplane */
                R.viewplane.xmin = viewplane->xmin + R.panodxv;
                R.viewplane.xmax = viewplane->xmax + R.panodxv;
                RE_SetWindow(re, &R.viewplane, R.clipsta, R.clipend);
                copy_m4_m4(R.winmat, re->winmat);
                
                /* rotate database according to part coordinates */
                project_renderdata(re, projectverto, 1, -R.panodxp*phi, 1);
                R.panosi= sin(R.panodxp*phi);
                R.panoco= cos(R.panodxp*phi);
        }
        return best;
}

static RenderPart *find_next_part(Render *re, int minx)
{
        RenderPart *pa, *best= NULL;

        /* long long int's needed because of overflow [#24414] */
        long long int centx=re->winx/2, centy=re->winy/2, tot=1;
        long long int mindist= (long long int)re->winx * (long long int)re->winy;
        
        /* find center of rendered parts, image center counts for 1 too */
        for(pa= re->parts.first; pa; pa= pa->next) {
                if(pa->ready) {
                        centx+= (pa->disprect.xmin+pa->disprect.xmax)/2;
                        centy+= (pa->disprect.ymin+pa->disprect.ymax)/2;
                        tot++;
                }
        }
        centx/=tot;
        centy/=tot;
        
        /* closest of the non-rendering parts */
        for(pa= re->parts.first; pa; pa= pa->next) {
                if(pa->ready==0 && pa->nr==0) {
                        long long int distx= centx - (pa->disprect.xmin+pa->disprect.xmax)/2;
                        long long int disty= centy - (pa->disprect.ymin+pa->disprect.ymax)/2;
                        distx= (long long int)sqrt(distx*distx + disty*disty);
                        if(distx<mindist) {
                                if(re->r.mode & R_PANORAMA) {
                                        if(pa->disprect.xmin==minx) {
                                                best= pa;
                                                mindist= distx;
                                        }
                                }
                                else {
                                        best= pa;
                                        mindist= distx;
                                }
                        }
                }
        }
        return best;
}

static void print_part_stats(Render *re, RenderPart *pa)
{
        char str[64];
        
        BLI_snprintf(str, sizeof(str), "%s, Part %d-%d", re->scene->id.name+2, pa->nr, re->i.totpart);
        re->i.infostr= str;
        re->stats_draw(re->sdh, &re->i);
        re->i.infostr= NULL;
}

/* make osa new results for samples */
static RenderResult *new_full_sample_buffers_exr(Render *re)
{
        int a;
        
        for(a=0; a<re->osa; a++) {
                RenderResult *rr= new_render_result(re, &re->disprect, 0, 1);
                BLI_addtail(&re->fullresult, rr);
                rr->sample_nr= a;
        }
        
        return re->fullresult.first;
}

static void threaded_tile_processor(Render *re)
{
        ListBase threads;
        RenderPart *pa, *nextpa;
        rctf viewplane= re->viewplane;
        int rendering=1, counter= 1, drawtimer=0, hasdrawn, minx=0;
        
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        /* first step; free the entire render result, make new, and/or prepare exr buffer saving */
        if(re->result==NULL || !(re->r.scemode & R_PREVIEWBUTS)) {
                RE_FreeRenderResult(re->result);
        
                if(re->sss_points && render_display_draw_enabled(re))
                        re->result= new_render_result(re, &re->disprect, 0, 0);
                else if(re->r.scemode & R_FULL_SAMPLE)
                        re->result= new_full_sample_buffers_exr(re);
                else
                        re->result= new_render_result(re, &re->disprect, 0, re->r.scemode & (R_EXR_TILE_FILE|R_FULL_SAMPLE));
        }

        BLI_rw_mutex_unlock(&re->resultmutex);
        
        if(re->result==NULL)
                return;
        
        /* warning; no return here without closing exr file */
        
        initparts(re);

        if(re->result->exrhandle) {
                RenderResult *rr;
                char str[FILE_MAX];
                
                for(rr= re->result; rr; rr= rr->next) {
                        render_unique_exr_name(re, str, rr->sample_nr);
                
                        printf("write exr tmp file, %dx%d, %s\n", rr->rectx, rr->recty, str);
                        IMB_exrtile_begin_write(rr->exrhandle, str, 0, rr->rectx, rr->recty, re->partx, re->party);
                }
        }
        
        BLI_init_threads(&threads, do_part_thread, re->r.threads);
        
        /* assuming no new data gets added to dbase... */
        R= *re;
        
        /* set threadsafe break */
        R.test_break= thread_break;
        
        /* timer loop demands to sleep when no parts are left, so we enter loop with a part */
        if(re->r.mode & R_PANORAMA)
                nextpa= find_next_pano_slice(re, &minx, &viewplane);
        else
                nextpa= find_next_part(re, 0);
        
        while(rendering) {
                
                if(re->test_break(re->tbh))
                        PIL_sleep_ms(50);
                else if(nextpa && BLI_available_threads(&threads)) {
                        drawtimer= 0;
                        nextpa->nr= counter++;  /* for nicest part, and for stats */
                        nextpa->thread= BLI_available_thread_index(&threads);   /* sample index */
                        BLI_insert_thread(&threads, nextpa);

                        nextpa= find_next_part(re, minx);
                }
                else if(re->r.mode & R_PANORAMA) {
                        if(nextpa==NULL && BLI_available_threads(&threads)==re->r.threads)
                                nextpa= find_next_pano_slice(re, &minx, &viewplane);
                        else {
                                PIL_sleep_ms(50);
                                drawtimer++;
                        }
                }
                else {
                        PIL_sleep_ms(50);
                        drawtimer++;
                }
                
                /* check for ready ones to display, and if we need to continue */
                rendering= 0;
                hasdrawn= 0;
                for(pa= re->parts.first; pa; pa= pa->next) {
                        if(pa->ready) {
                                
                                BLI_remove_thread(&threads, pa);
                                
                                if(pa->result) {
                                        if(render_display_draw_enabled(re))
                                                re->display_draw(re->ddh, pa->result, NULL);
                                        print_part_stats(re, pa);
                                        
                                        free_render_result(&pa->fullresult, pa->result);
                                        pa->result= NULL;
                                        re->i.partsdone++;
                                        re->progress(re->prh, re->i.partsdone / (float)re->i.totpart);
                                        hasdrawn= 1;
                                }
                        }
                        else {
                                rendering= 1;
                                if(pa->nr && pa->result && drawtimer>20) {
                                        if(render_display_draw_enabled(re))
                                                re->display_draw(re->ddh, pa->result, &pa->result->renrect);
                                        hasdrawn= 1;
                                }
                        }
                }
                if(hasdrawn)
                        drawtimer= 0;

                /* on break, wait for all slots to get freed */
                if( (g_break=re->test_break(re->tbh)) && BLI_available_threads(&threads)==re->r.threads)
                        rendering= 0;
                
        }
        
        if(re->result->exrhandle) {
                RenderResult *rr;

                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
                save_empty_result_tiles(re);
                
                for(rr= re->result; rr; rr= rr->next) {
                        IMB_exr_close(rr->exrhandle);
                        rr->exrhandle= NULL;
                }
                
                free_render_result(&re->fullresult, re->result);
                re->result= NULL;

                BLI_rw_mutex_unlock(&re->resultmutex);
                
                read_render_result(re, 0);
        }
        
        /* unset threadsafety */
        g_break= 0;
        
        BLI_end_threads(&threads);
        freeparts(re);
        re->viewplane= viewplane; /* restore viewplane, modified by pano render */
}

/* currently only called by preview renders and envmap */
void RE_TileProcessor(Render *re)
{
        threaded_tile_processor(re);
}

/* ************  This part uses API, for rendering Blender scenes ********** */

static int external_render_3d(Render *re, int do_all);

static void do_render_3d(Render *re)
{
        /* try external */
        if(external_render_3d(re, 0))
                return;

        /* internal */
        
//      re->cfra= cfra; /* <- unused! */
        re->scene->r.subframe = re->mblur_offs + re->field_offs;
        
        /* lock drawing in UI during data phase */
        if(re->draw_lock)
                re->draw_lock(re->dlh, 1);
        
        /* make render verts/faces/halos/lamps */
        if(render_scene_needs_vector(re))
                RE_Database_FromScene_Vectors(re, re->main, re->scene, re->lay);
        else
           RE_Database_FromScene(re, re->main, re->scene, re->lay, 1);
        
        /* clear UI drawing locks */
        if(re->draw_lock)
                re->draw_lock(re->dlh, 0);
        
        threaded_tile_processor(re);
        
        /* do left-over 3d post effects (flares) */
        if(re->flag & R_HALO)
                if(!re->test_break(re->tbh))
                        add_halo_flare(re);
        
        /* free all render verts etc */
        RE_Database_Free(re);
        
        re->scene->r.subframe = 0.f;
}

/* called by blur loop, accumulate RGBA key alpha */
static void addblur_rect_key(RenderResult *rr, float *rectf, float *rectf1, float blurfac)
{
        float mfac= 1.0f - blurfac;
        int a, b, stride= 4*rr->rectx;
        int len= stride*sizeof(float);
        
        for(a=0; a<rr->recty; a++) {
                if(blurfac==1.0f) {
                        memcpy(rectf, rectf1, len);
                }
                else {
                        float *rf= rectf, *rf1= rectf1;
                        
                        for( b= rr->rectx; b>0; b--, rf+=4, rf1+=4) {
                                if(rf1[3]<0.01f)
                                        rf[3]= mfac*rf[3];
                                else if(rf[3]<0.01f) {
                                        rf[0]= rf1[0];
                                        rf[1]= rf1[1];
                                        rf[2]= rf1[2];
                                        rf[3]= blurfac*rf1[3];
                                }
                                else {
                                        rf[0]= mfac*rf[0] + blurfac*rf1[0];
                                        rf[1]= mfac*rf[1] + blurfac*rf1[1];
                                        rf[2]= mfac*rf[2] + blurfac*rf1[2];
                                        rf[3]= mfac*rf[3] + blurfac*rf1[3];
                                }                               
                        }
                }
                rectf+= stride;
                rectf1+= stride;
        }
}

/* called by blur loop, accumulate renderlayers */
static void addblur_rect(RenderResult *rr, float *rectf, float *rectf1, float blurfac, int channels)
{
        float mfac= 1.0f - blurfac;
        int a, b, stride= channels*rr->rectx;
        int len= stride*sizeof(float);
        
        for(a=0; a<rr->recty; a++) {
                if(blurfac==1.0f) {
                        memcpy(rectf, rectf1, len);
                }
                else {
                        float *rf= rectf, *rf1= rectf1;
                        
                        for( b= rr->rectx*channels; b>0; b--, rf++, rf1++) {
                                rf[0]= mfac*rf[0] + blurfac*rf1[0];
                        }
                }
                rectf+= stride;
                rectf1+= stride;
        }
}


/* called by blur loop, accumulate renderlayers */
static void merge_renderresult_blur(RenderResult *rr, RenderResult *brr, float blurfac, int key_alpha)
{
        RenderLayer *rl, *rl1;
        RenderPass *rpass, *rpass1;
        
        rl1= brr->layers.first;
        for(rl= rr->layers.first; rl && rl1; rl= rl->next, rl1= rl1->next) {
                
                /* combined */
                if(rl->rectf && rl1->rectf) {
                        if(key_alpha)
                                addblur_rect_key(rr, rl->rectf, rl1->rectf, blurfac);
                        else
                                addblur_rect(rr, rl->rectf, rl1->rectf, blurfac, 4);
                }
                
                /* passes are allocated in sync */
                rpass1= rl1->passes.first;
                for(rpass= rl->passes.first; rpass && rpass1; rpass= rpass->next, rpass1= rpass1->next) {
                        addblur_rect(rr, rpass->rect, rpass1->rect, blurfac, rpass->channels);
                }
        }
}

/* main blur loop, can be called by fields too */
static void do_render_blur_3d(Render *re)
{
        RenderResult *rres;
        float blurfac;
        int blur= re->r.mblur_samples;
        
        /* create accumulation render result */
        rres= new_render_result(re, &re->disprect, 0, RR_USEMEM);
        
        /* do the blur steps */
        while(blur--) {
                re->mblur_offs = re->r.blurfac*((float)(re->r.mblur_samples-blur))/(float)re->r.mblur_samples;
                
                re->i.curblur= re->r.mblur_samples-blur;        /* stats */
                
                do_render_3d(re);
                
                blurfac= 1.0f/(float)(re->r.mblur_samples-blur);
                
                merge_renderresult_blur(rres, re->result, blurfac, re->r.alphamode & R_ALPHAKEY);
                if(re->test_break(re->tbh)) break;
        }
        
        /* swap results */
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        RE_FreeRenderResult(re->result);
        re->result= rres;
        BLI_rw_mutex_unlock(&re->resultmutex);
        
        re->mblur_offs = 0.0f;
        re->i.curblur= 0;       /* stats */
        
        /* weak... the display callback wants an active renderlayer pointer... */
        re->result->renlay= render_get_active_layer(re, re->result);
        re->display_draw(re->ddh, re->result, NULL);    
}


/* function assumes rectf1 and rectf2 to be half size of rectf */
static void interleave_rect(RenderResult *rr, float *rectf, float *rectf1, float *rectf2, int channels)
{
        int a, stride= channels*rr->rectx;
        int len= stride*sizeof(float);
        
        for(a=0; a<rr->recty; a+=2) {
                memcpy(rectf, rectf1, len);
                rectf+= stride;
                rectf1+= stride;
                memcpy(rectf, rectf2, len);
                rectf+= stride;
                rectf2+= stride;
        }
}

/* merge render results of 2 fields */
static void merge_renderresult_fields(RenderResult *rr, RenderResult *rr1, RenderResult *rr2)
{
        RenderLayer *rl, *rl1, *rl2;
        RenderPass *rpass, *rpass1, *rpass2;
        
        rl1= rr1->layers.first;
        rl2= rr2->layers.first;
        for(rl= rr->layers.first; rl && rl1 && rl2; rl= rl->next, rl1= rl1->next, rl2= rl2->next) {
                
                /* combined */
                if(rl->rectf && rl1->rectf && rl2->rectf)
                        interleave_rect(rr, rl->rectf, rl1->rectf, rl2->rectf, 4);
                
                /* passes are allocated in sync */
                rpass1= rl1->passes.first;
                rpass2= rl2->passes.first;
                for(rpass= rl->passes.first; rpass && rpass1 && rpass2; rpass= rpass->next, rpass1= rpass1->next, rpass2= rpass2->next) {
                        interleave_rect(rr, rpass->rect, rpass1->rect, rpass2->rect, rpass->channels);
                }
        }
}


/* interleaves 2 frames */
static void do_render_fields_3d(Render *re)
{
        Object *camera= RE_GetCamera(re);
        RenderResult *rr1, *rr2= NULL;
        
        /* no render result was created, we can safely halve render y */
        re->winy /= 2;
        re->recty /= 2;
        re->disprect.ymin /= 2;
        re->disprect.ymax /= 2;
        
        re->i.curfield= 1;      /* stats */
        
        /* first field, we have to call camera routine for correct aspect and subpixel offset */
        RE_SetCamera(re, camera);
        if(re->r.mode & R_MBLUR && (re->r.scemode & R_FULL_SAMPLE)==0)
                do_render_blur_3d(re);
        else
                do_render_3d(re);

        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        rr1= re->result;
        re->result= NULL;
        BLI_rw_mutex_unlock(&re->resultmutex);
        
        /* second field */
        if(!re->test_break(re->tbh)) {
                
                re->i.curfield= 2;      /* stats */
                
                re->flag |= R_SEC_FIELD;
                if((re->r.mode & R_FIELDSTILL)==0) {
                        re->field_offs = 0.5f;
                }
                RE_SetCamera(re, camera);
                if(re->r.mode & R_MBLUR && (re->r.scemode & R_FULL_SAMPLE)==0)
                        do_render_blur_3d(re);
                else
                        do_render_3d(re);
                re->flag &= ~R_SEC_FIELD;
                
                re->field_offs = 0.0f;
                
                rr2= re->result;
        }
        
        /* allocate original height new buffers */
        re->winy *= 2;
        re->recty *= 2;
        re->disprect.ymin *= 2;
        re->disprect.ymax *= 2;

        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        re->result= new_render_result(re, &re->disprect, 0, RR_USEMEM);

        if(rr2) {
                if(re->r.mode & R_ODDFIELD)
                        merge_renderresult_fields(re->result, rr2, rr1);
                else
                        merge_renderresult_fields(re->result, rr1, rr2);
                
                RE_FreeRenderResult(rr2);
        }

        RE_FreeRenderResult(rr1);
        
        re->i.curfield= 0;      /* stats */
        
        /* weak... the display callback wants an active renderlayer pointer... */
        re->result->renlay= render_get_active_layer(re, re->result);

        BLI_rw_mutex_unlock(&re->resultmutex);

        re->display_draw(re->ddh, re->result, NULL);
}

/* main render routine, no compositing */
static void do_render_fields_blur_3d(Render *re)
{
        Object *camera= RE_GetCamera(re);
        /* also check for camera here */
        if(camera == NULL) {
                printf("ERROR: Cannot render, no camera\n");
                G.afbreek= 1;
                return;
        }

        /* now use renderdata and camera to set viewplane */
        RE_SetCamera(re, camera);
        
        if(re->r.mode & R_FIELDS)
                do_render_fields_3d(re);
        else if(re->r.mode & R_MBLUR && (re->r.scemode & R_FULL_SAMPLE)==0)
                do_render_blur_3d(re);
        else
                do_render_3d(re);
        
        /* when border render, check if we have to insert it in black */
        if(re->result) {
                if(re->r.mode & R_BORDER) {
                        if((re->r.mode & R_CROP)==0) {
                                RenderResult *rres;
                                
                                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

                                /* sub-rect for merge call later on */
                                re->result->tilerect= re->disprect;
                                
                                /* this copying sequence could become function? */
                                /* weak is: it chances disprect from border */
                                re->disprect.xmin= re->disprect.ymin= 0;
                                re->disprect.xmax= re->winx;
                                re->disprect.ymax= re->winy;
                                re->rectx= re->winx;
                                re->recty= re->winy;
                                
                                rres= new_render_result(re, &re->disprect, 0, RR_USEMEM);
                                
                                merge_render_result(rres, re->result);
                                RE_FreeRenderResult(re->result);
                                re->result= rres;
                                
                                /* weak... the display callback wants an active renderlayer pointer... */
                                re->result->renlay= render_get_active_layer(re, re->result);
                                
                                BLI_rw_mutex_unlock(&re->resultmutex);
                
                                re->display_init(re->dih, re->result);
                                re->display_draw(re->ddh, re->result, NULL);
                        }
                        else {
                                /* set offset (again) for use in compositor, disprect was manipulated. */
                                re->result->xof= 0;
                                re->result->yof= 0;
                        }
                }
        }
}


/* within context of current Render *re, render another scene.
   it uses current render image size and disprect, but doesn't execute composite
*/
static void render_scene(Render *re, Scene *sce, int cfra)
{
        Render *resc= RE_NewRender(sce->id.name);
        int winx= re->winx, winy= re->winy;
        
        sce->r.cfra= cfra;

        scene_camera_switch_update(sce);

        /* exception: scene uses own size (unfinished code) */
        if(0) {
                winx= (sce->r.size*sce->r.xsch)/100;
                winy= (sce->r.size*sce->r.ysch)/100;
        }
        
        /* initial setup */
        RE_InitState(resc, re, &sce->r, NULL, winx, winy, &re->disprect);
        
        /* still unsure entity this... */
        resc->main= re->main;
        resc->scene= sce;
        resc->lay= sce->lay;
        
        /* ensure scene has depsgraph, base flags etc OK */
        set_scene_bg(re->main, sce);

        /* copy callbacks */
        resc->display_draw= re->display_draw;
        resc->ddh= re->ddh;
        resc->test_break= re->test_break;
        resc->tbh= re->tbh;
        resc->stats_draw= re->stats_draw;
        resc->sdh= re->sdh;
        
        do_render_fields_blur_3d(resc);
}

/* helper call to detect if this scene needs a render, or if there's a any render layer to render */
static int composite_needs_render(Scene *sce, int this_scene)
{
        bNodeTree *ntree= sce->nodetree;
        bNode *node;
        
        if(ntree==NULL) return 1;
        if(sce->use_nodes==0) return 1;
        if((sce->r.scemode & R_DOCOMP)==0) return 1;
        
        for(node= ntree->nodes.first; node; node= node->next) {
                if(node->type==CMP_NODE_R_LAYERS)
                        if(this_scene==0 || node->id==NULL || node->id==&sce->id)
                                return 1;
        }
        return 0;
}

static void tag_scenes_for_render(Render *re)
{
        bNode *node;
        Scene *sce;
        
        for(sce= re->main->scene.first; sce; sce= sce->id.next)
                sce->id.flag &= ~LIB_DOIT;
        
        if(RE_GetCamera(re) && composite_needs_render(re->scene, 1))
                re->scene->id.flag |= LIB_DOIT;
        
        if(re->scene->nodetree==NULL) return;
        
        /* check for render-layers nodes using other scenes, we tag them LIB_DOIT */
        for(node= re->scene->nodetree->nodes.first; node; node= node->next) {
                if(node->type==CMP_NODE_R_LAYERS) {
                        if(node->id) {
                                if(node->id != (ID *)re->scene)
                                        node->id->flag |= LIB_DOIT;
                        }
                }
        }
        
}

static void ntree_render_scenes(Render *re)
{
        bNode *node;
        int cfra= re->scene->r.cfra;
        int restore_scene= 0;
        
        if(re->scene->nodetree==NULL) return;
        
        tag_scenes_for_render(re);
        
        /* now foreach render-result node tagged we do a full render */
        /* results are stored in a way compisitor will find it */
        for(node= re->scene->nodetree->nodes.first; node; node= node->next) {
                if(node->type==CMP_NODE_R_LAYERS) {
                        if(node->id && node->id != (ID *)re->scene) {
                                if(node->id->flag & LIB_DOIT) {
                                        Scene *scene = (Scene*)node->id;

                                        render_scene(re, scene, cfra);
                                        restore_scene= (scene != re->scene);
                                        node->id->flag &= ~LIB_DOIT;
                                        
                                        NodeTagChanged(re->scene->nodetree, node);
                                }
                        }
                }
        }

        /* restore scene if we rendered another last */
        if(restore_scene)
                set_scene_bg(re->main, re->scene);
}

/* bad call... need to think over proper method still */
static void render_composit_stats(void *UNUSED(arg), char *str)
{
        R.i.infostr= str;
        R.stats_draw(R.sdh, &R.i);
        R.i.infostr= NULL;
}


/* reads all buffers, calls optional composite, merges in first result->rectf */
static void do_merge_fullsample(Render *re, bNodeTree *ntree)
{
        float *rectf, filt[3][3];
        int sample;
        
        /* interaction callbacks */
        if(ntree) {
                ntree->stats_draw= render_composit_stats;
                ntree->test_break= re->test_break;
                ntree->progress= re->progress;
                ntree->sdh= re->sdh;
                ntree->tbh= re->tbh;
                ntree->prh= re->prh;
        }
        
        /* filtmask needs it */
        R= *re;
        
        /* we accumulate in here */
        rectf= MEM_mapallocN(re->rectx*re->recty*sizeof(float)*4, "fullsample rgba");
        
        for(sample=0; sample<re->r.osa; sample++) {
                Render *re1;
                RenderResult rres;
                int x, y, mask;
                
                /* enable full sample print */
                R.i.curfsa= sample+1;
                
                /* set all involved renders on the samplebuffers (first was done by render itself, but needs tagged) */
                /* also function below assumes this */
                        
                tag_scenes_for_render(re);
                for(re1= RenderGlobal.renderlist.first; re1; re1= re1->next) {
                        if(re1->scene->id.flag & LIB_DOIT) {
                                if(re1->r.scemode & R_FULL_SAMPLE) {
                                        if(sample)
                                                read_render_result(re1, sample);
                                        ntreeCompositTagRender(re1->scene); /* ensure node gets exec to put buffers on stack */
                                }
                        }
                }
                
                /* composite */
                if(ntree) {
                        ntreeCompositTagRender(re->scene);
                        ntreeCompositTagAnimated(ntree);
                        
                        ntreeCompositExecTree(ntree, &re->r, G.background==0);
                }
                
                /* ensure we get either composited result or the active layer */
                RE_AcquireResultImage(re, &rres);
                
                /* accumulate with filter, and clip */
                mask= (1<<sample);
                mask_array(mask, filt);

                for(y=0; y<re->recty; y++) {
                        float *rf= rectf + 4*y*re->rectx;
                        float *col= rres.rectf + 4*y*re->rectx;
                                
                        for(x=0; x<re->rectx; x++, rf+=4, col+=4) {
                                /* clamping to 1.0 is needed for correct AA */
                                if(col[0]<0.0f) col[0]=0.0f; else if(col[0] > 1.0f) col[0]= 1.0f;
                                if(col[1]<0.0f) col[1]=0.0f; else if(col[1] > 1.0f) col[1]= 1.0f;
                                if(col[2]<0.0f) col[2]=0.0f; else if(col[2] > 1.0f) col[2]= 1.0f;
                                
                                add_filt_fmask_coord(filt, col, rf, re->rectx, re->recty, x, y);
                        }
                }
                
                RE_ReleaseResultImage(re);

                /* show stuff */
                if(sample!=re->osa-1) {
                        /* weak... the display callback wants an active renderlayer pointer... */
                        re->result->renlay= render_get_active_layer(re, re->result);
                        re->display_draw(re->ddh, re->result, NULL);
                }
                
                if(re->test_break(re->tbh))
                        break;
        }
        
        /* clear interaction callbacks */
        if(ntree) {
                ntree->stats_draw= NULL;
                ntree->test_break= NULL;
                ntree->progress= NULL;
                ntree->tbh= ntree->sdh= ntree->prh= NULL;
        }
        
        /* disable full sample print */
        R.i.curfsa= 0;
        
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        if(re->result->rectf) 
                MEM_freeN(re->result->rectf);
        re->result->rectf= rectf;
        BLI_rw_mutex_unlock(&re->resultmutex);
}

/* called externally, via compositor */
void RE_MergeFullSample(Render *re, Main *bmain, Scene *sce, bNodeTree *ntree)
{
        Scene *scene;
        bNode *node;

        /* default start situation */
        G.afbreek= 0;
        
        re->main= bmain;
        re->scene= sce;
        
        /* first call RE_ReadRenderResult on every renderlayer scene. this creates Render structs */
        
        /* tag scenes unread */
        for(scene= re->main->scene.first; scene; scene= scene->id.next) 
                scene->id.flag |= LIB_DOIT;
        
        for(node= ntree->nodes.first; node; node= node->next) {
                if(node->type==CMP_NODE_R_LAYERS) {
                        Scene *nodescene= (Scene *)node->id;
                        
                        if(nodescene==NULL) nodescene= sce;
                        if(nodescene->id.flag & LIB_DOIT) {
                                nodescene->r.mode |= R_OSA;     /* render struct needs tables */
                                RE_ReadRenderResult(sce, nodescene);
                                nodescene->id.flag &= ~LIB_DOIT;
                        }
                }
        }
        
        /* own render result should be read/allocated */
        if(re->scene->id.flag & LIB_DOIT) {
                RE_ReadRenderResult(re->scene, re->scene);
                re->scene->id.flag &= ~LIB_DOIT;
        }
        
        /* and now we can draw (result is there) */
        re->display_init(re->dih, re->result);
        re->display_clear(re->dch, re->result);
        
        do_merge_fullsample(re, ntree);
}

/* returns fully composited render-result on given time step (in RenderData) */
static void do_render_composite_fields_blur_3d(Render *re)
{
        bNodeTree *ntree= re->scene->nodetree;
        int update_newframe=0;
        
        /* INIT seeding, compositor can use random texture */
        BLI_srandom(re->r.cfra);
        
        if(composite_needs_render(re->scene, 1)) {
                /* save memory... free all cached images */
                ntreeFreeCache(ntree);
                
                do_render_fields_blur_3d(re);
        } 
        else {
                /* ensure new result gets added, like for regular renders */
                BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
                
                RE_FreeRenderResult(re->result);
                re->result= new_render_result(re, &re->disprect, 0, RR_USEMEM);

                BLI_rw_mutex_unlock(&re->resultmutex);
                
                /* scene render process already updates animsys */
                update_newframe = 1;
        }
        
        /* swap render result */
        if(re->r.scemode & R_SINGLE_LAYER)
                pop_render_result(re);
        
        if(!re->test_break(re->tbh)) {
                
                if(ntree) {
                        ntreeCompositTagRender(re->scene);
                        ntreeCompositTagAnimated(ntree);
                }
                
                if(ntree && re->r.scemode & R_DOCOMP) {
                        /* checks if there are render-result nodes that need scene */
                        if((re->r.scemode & R_SINGLE_LAYER)==0)
                                ntree_render_scenes(re);
                        
                        if(!re->test_break(re->tbh)) {
                                ntree->stats_draw= render_composit_stats;
                                ntree->test_break= re->test_break;
                                ntree->progress= re->progress;
                                ntree->sdh= re->sdh;
                                ntree->tbh= re->tbh;
                                ntree->prh= re->prh;
                                
                                /* in case it was never initialized */
                                R.sdh= re->sdh;
                                R.stats_draw= re->stats_draw;
                                
                                if (update_newframe)
                                        scene_update_for_newframe(re->main, re->scene, re->lay);
                                
                                if(re->r.scemode & R_FULL_SAMPLE) 
                                        do_merge_fullsample(re, ntree);
                                else {
                                        ntreeCompositExecTree(ntree, &re->r, G.background==0);
                                }
                                
                                ntree->stats_draw= NULL;
                                ntree->test_break= NULL;
                                ntree->progress= NULL;
                                ntree->tbh= ntree->sdh= ntree->prh= NULL;
                        }
                }
                else if(re->r.scemode & R_FULL_SAMPLE)
                        do_merge_fullsample(re, NULL);
        }

        /* weak... the display callback wants an active renderlayer pointer... */
        re->result->renlay= render_get_active_layer(re, re->result);
        re->display_draw(re->ddh, re->result, NULL);
}

static void renderresult_stampinfo(Render *re)
{
        RenderResult rres;

        /* this is the basic trick to get the displayed float or char rect from render result */
        RE_AcquireResultImage(re, &rres);
        BKE_stamp_buf(re->scene, RE_GetCamera(re), (unsigned char *)rres.rect32, rres.rectf, rres.rectx, rres.recty, 4);
        RE_ReleaseResultImage(re);
}

static int seq_render_active(Render *re)
{
        Editing *ed;
        Sequence *seq;

        ed = re->scene->ed;
        
        if (!(re->r.scemode & R_DOSEQ) || !ed || !ed->seqbase.first)
                return 0;
        
        for (seq= ed->seqbase.first; seq; seq= seq->next) {
                if (seq->type != SEQ_SOUND)
                        return 1;
        }
        
        return 0;
}

static void do_render_seq(Render * re)
{
        static int recurs_depth = 0;
        struct ImBuf *ibuf;
        RenderResult *rr; /* don't assign re->result here as it might change during give_ibuf_seq */
        int cfra = re->r.cfra;
        SeqRenderData context;

        re->i.cfra= cfra;

        if(recurs_depth==0) {
                /* otherwise sequencer animation isnt updated */
                BKE_animsys_evaluate_all_animation(re->main, (float)cfra); // XXX, was BKE_curframe(re->scene)
        }

        recurs_depth++;

        context = seq_new_render_data(re->main, re->scene,
                                      re->result->rectx, re->result->recty, 
                                      100);

        ibuf = give_ibuf_seq(context, cfra, 0);

        recurs_depth--;

        rr = re->result;
        
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);

        if(ibuf) {
                if(ibuf->rect_float) {
                        if (!rr->rectf)
                                rr->rectf= MEM_mallocN(4*sizeof(float)*rr->rectx*rr->recty, "render_seq rectf");
                        
                        /* color management: when off ensure rectf is non-lin, since thats what the internal
                         * render engine delivers */
                        if(re->r.color_mgt_flag & R_COLOR_MANAGEMENT) {
                                if(ibuf->profile == IB_PROFILE_LINEAR_RGB)
                                        memcpy(rr->rectf, ibuf->rect_float, 4*sizeof(float)*rr->rectx*rr->recty);
                                else
                                        srgb_to_linearrgb_rgba_rgba_buf(rr->rectf, ibuf->rect_float, rr->rectx*rr->recty);
                                        
                        }
                        else {
                                if(ibuf->profile != IB_PROFILE_LINEAR_RGB)
                                        memcpy(rr->rectf, ibuf->rect_float, 4*sizeof(float)*rr->rectx*rr->recty);
                                else
                                        linearrgb_to_srgb_rgba_rgba_buf(rr->rectf, ibuf->rect_float, rr->rectx*rr->recty);
                        }
                        
                        /* TSK! Since sequence render doesn't free the *rr render result, the old rect32
                           can hang around when sequence render has rendered a 32 bits one before */
                        if(rr->rect32) {
                                MEM_freeN(rr->rect32);
                                rr->rect32= NULL;
                        }
                }
                else if(ibuf->rect) {
                        if (!rr->rect32)
                                rr->rect32= MEM_mallocN(sizeof(int)*rr->rectx*rr->recty, "render_seq rect");

                        memcpy(rr->rect32, ibuf->rect, 4*rr->rectx*rr->recty);

                        /* if (ibuf->zbuf) { */
                        /*      if (R.rectz) freeN(R.rectz); */
                        /*      R.rectz = BLI_dupallocN(ibuf->zbuf); */
                        /* } */

                        /* Same things as above, old rectf can hang around from previous render. */
                        if(rr->rectf) {
                                MEM_freeN(rr->rectf);
                                rr->rectf= NULL;
                        }
                }
                
                if (recurs_depth == 0) { /* with nested scenes, only free on toplevel... */
                        Editing * ed = re->scene->ed;
                        if (ed) {
                                free_imbuf_seq(re->scene, &ed->seqbase, TRUE, TRUE);
                        }
                }
                IMB_freeImBuf(ibuf);
        }
        else {
                /* render result is delivered empty in most cases, nevertheless we handle all cases */
                if (rr->rectf)
                        memset(rr->rectf, 0, 4*sizeof(float)*rr->rectx*rr->recty);
                else if (rr->rect32)
                        memset(rr->rect32, 0, 4*rr->rectx*rr->recty);
                else
                        rr->rect32= MEM_callocN(sizeof(int)*rr->rectx*rr->recty, "render_seq rect");
        }

        BLI_rw_mutex_unlock(&re->resultmutex);

        /* just in case this flag went missing at some point */
        re->r.scemode |= R_DOSEQ;
}

/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */

/* main loop: doing sequence + fields + blur + 3d render + compositing */
static void do_render_all_options(Render *re)
{
        scene_camera_switch_update(re->scene);

        re->i.starttime= PIL_check_seconds_timer();

        /* ensure no images are in memory from previous animated sequences */
        BKE_image_all_free_anim_ibufs(re->r.cfra);

        if(external_render_3d(re, 1)) {
                /* in this case external render overrides all */
        }
        else if(seq_render_active(re)) {
                /* note: do_render_seq() frees rect32 when sequencer returns float images */
                if(!re->test_break(re->tbh)) 
                        do_render_seq(re);
                
                re->stats_draw(re->sdh, &re->i);
                re->display_draw(re->ddh, re->result, NULL);
        }
        else {
                do_render_composite_fields_blur_3d(re);
        }
        
        /* for UI only */
        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        renderresult_add_names(re->result);
        BLI_rw_mutex_unlock(&re->resultmutex);
        
        re->i.lastframetime= PIL_check_seconds_timer()- re->i.starttime;
        
        re->stats_draw(re->sdh, &re->i);
        
        /* stamp image info here */
        if((re->r.stamp & R_STAMP_ALL) && (re->r.stamp & R_STAMP_DRAW)) {
                renderresult_stampinfo(re);
                re->display_draw(re->ddh, re->result, NULL);
        }
}

static int check_valid_camera(Scene *scene, Object *camera_override)
{
        int check_comp= 1;

        if (camera_override == NULL && scene->camera == NULL)
                scene->camera= scene_find_camera(scene);

        if(scene->r.scemode&R_DOSEQ) {
                if(scene->ed) {
                        Sequence *seq= scene->ed->seqbase.first;

                        check_comp= 0;

                        while(seq) {
                                if(seq->type == SEQ_SCENE) {
                                        if(!seq->scene_camera) {
                                                if(!seq->scene->camera && !scene_find_camera(seq->scene)) {
                                                        if(seq->scene == scene) {
                                                                /* for current scene camera could be unneeded due to compisite nodes */
                                                                check_comp= 1;
                                                        } else {
                                                                /* for other scenes camera is necessary */
                                                                return 0;
                                                        }
                                                }
                                        }
                                }

                                seq= seq->next;
                        }
                }
        }

        if(check_comp) { /* no sequencer or sequencer depends on compositor */
                if(scene->r.scemode&R_DOCOMP && scene->use_nodes) {
                        bNode *node= scene->nodetree->nodes.first;

                        while(node) {
                                if(node->type == CMP_NODE_R_LAYERS) {
                                        Scene *sce= node->id ? (Scene*)node->id : scene;

                                        if(!sce->camera && !scene_find_camera(sce)) {
                                                /* all render layers nodes need camera */
                                                return 0;
                                        }
                                }

                                node= node->next;
                        }
                } else {
                        return (camera_override != NULL || scene->camera != NULL);
                }
        }

        return 1;
}

int RE_is_rendering_allowed(Scene *scene, Object *camera_override, ReportList *reports)
{
        SceneRenderLayer *srl;
        
        if(scene->r.mode & R_BORDER) {
                if(scene->r.border.xmax <= scene->r.border.xmin ||
                   scene->r.border.ymax <= scene->r.border.ymin) {
                        BKE_report(reports, RPT_ERROR, "No border area selected.");
                        return 0;
                }
        }
        
        if(scene->r.scemode & (R_EXR_TILE_FILE|R_FULL_SAMPLE)) {
                char str[FILE_MAX];
                
                scene_unique_exr_name(scene, str, 0);
                
                if (BLI_is_writable(str)==0) {
                        BKE_report(reports, RPT_ERROR, "Can not save render buffers, check the temp default path");
                        return 0;
                }
                
                /* no fullsample and edge */
                if((scene->r.scemode & R_FULL_SAMPLE) && (scene->r.mode & R_EDGE)) {
                        BKE_report(reports, RPT_ERROR, "Full Sample doesn't support Edge Enhance");
                        return 0;
                }
                
        }
        else
                scene->r.scemode &= ~R_FULL_SAMPLE;     /* clear to be sure */
        
        if(scene->r.scemode & R_DOCOMP) {
                if(scene->use_nodes) {
                        bNodeTree *ntree= scene->nodetree;
                        bNode *node;
                
                        if(ntree==NULL) {
                                BKE_report(reports, RPT_ERROR, "No Nodetree in Scene");
                                return 0;
                        }
                        
                        for(node= ntree->nodes.first; node; node= node->next)
                                if(node->type==CMP_NODE_COMPOSITE)
                                        break;
                        
                        if(node==NULL) {
                                BKE_report(reports, RPT_ERROR, "No Render Output Node in Scene");
                                return 0;
                        }
                        
                        if(scene->r.scemode & R_FULL_SAMPLE) {
                                if(composite_needs_render(scene, 0)==0) {
                                        BKE_report(reports, RPT_ERROR, "Full Sample AA not supported without 3d rendering");
                                        return 0;
                                }
                        }
                }
        }
        
         /* check valid camera, without camera render is OK (compo, seq) */
        if(!check_valid_camera(scene, camera_override)) {
                BKE_report(reports, RPT_ERROR, "No camera");
                return 0;
        }
        
        /* get panorama & ortho, only after camera is set */
        object_camera_mode(&scene->r, camera_override ? camera_override : scene->camera);

        /* forbidden combinations */
        if(scene->r.mode & R_PANORAMA) {
                if(scene->r.mode & R_ORTHO) {
                        BKE_report(reports, RPT_ERROR, "No Ortho render possible for Panorama");
                        return 0;
                }
        }

        /* layer flag tests */
        if(scene->r.scemode & R_SINGLE_LAYER) {
                srl= BLI_findlink(&scene->r.layers, scene->r.actlay);
                /* force layer to be enabled */
                srl->layflag &= ~SCE_LAY_DISABLE;
        }
        
        for(srl= scene->r.layers.first; srl; srl= srl->next)
                if(!(srl->layflag & SCE_LAY_DISABLE))
                        break;
        if(srl==NULL) {
                BKE_report(reports, RPT_ERROR, "All RenderLayers are disabled");
                return 0;
        }
        
        /* renderer */
        if(!ELEM(scene->r.renderer, R_INTERN, R_YAFRAY)) {
                BKE_report(reports, RPT_ERROR, "Unknown render engine set");
                return 0;
        }

        return 1;
}

static void validate_render_settings(Render *re)
{
        if(re->r.scemode & (R_EXR_TILE_FILE|R_FULL_SAMPLE)) {
                /* no osa + fullsample won't work... */
                if(re->r.osa==0)
                        re->r.scemode &= ~R_FULL_SAMPLE;
        } else re->r.scemode &= ~R_FULL_SAMPLE; /* clear to be sure */
}

static void update_physics_cache(Render *re, Scene *scene, int UNUSED(anim_init))
{
        PTCacheBaker baker;

        baker.main = re->main;
        baker.scene = scene;
        baker.pid = NULL;
        baker.bake = 0;
        baker.render = 1;
        baker.anim_init = 1;
        baker.quick_step = 1;
        baker.break_test = re->test_break;
        baker.break_data = re->tbh;
        baker.progressbar = NULL;

        BKE_ptcache_bake(&baker);
}
/* evaluating scene options for general Blender render */
static int render_initialize_from_main(Render *re, Main *bmain, Scene *scene, SceneRenderLayer *srl, Object *camera_override, unsigned int lay, int anim, int anim_init)
{
        int winx, winy;
        rcti disprect;
        
        /* r.xsch and r.ysch has the actual view window size
                r.border is the clipping rect */
        
        /* calculate actual render result and display size */
        winx= (scene->r.size*scene->r.xsch)/100;
        winy= (scene->r.size*scene->r.ysch)/100;
        
        /* we always render smaller part, inserting it in larger image is compositor bizz, it uses disprect for it */
        if(scene->r.mode & R_BORDER) {
                disprect.xmin= scene->r.border.xmin*winx;
                disprect.xmax= scene->r.border.xmax*winx;
                
                disprect.ymin= scene->r.border.ymin*winy;
                disprect.ymax= scene->r.border.ymax*winy;
        }
        else {
                disprect.xmin= disprect.ymin= 0;
                disprect.xmax= winx;
                disprect.ymax= winy;
        }
        
        re->main= bmain;
        re->scene= scene;
        re->camera_override= camera_override;
        re->lay= lay;
        
        /* not too nice, but it survives anim-border render */
        if(anim) {
                re->disprect= disprect;
                return 1;
        }
        
        /* check all scenes involved */
        tag_scenes_for_render(re);

        /*
         * Disabled completely for now,
         * can be later set as render profile option
         * and default for background render.
        */
        if(0) {
                /* make sure dynamics are up to date */
                update_physics_cache(re, scene, anim_init);
        }
        
        if(srl || scene->r.scemode & R_SINGLE_LAYER)
                push_render_result(re);
        
        RE_InitState(re, NULL, &scene->r, srl, winx, winy, &disprect);
        if(!re->ok)  /* if an error was printed, abort */
                return 0;
        
        /* initstate makes new result, have to send changed tags around */
        ntreeCompositTagRender(re->scene);

        validate_render_settings(re);

        re->display_init(re->dih, re->result);
        re->display_clear(re->dch, re->result);
        
        return 1;
}

void RE_SetReports(Render *re, ReportList *reports)
{
        re->reports= reports;
}

/* general Blender frame render call */
void RE_BlenderFrame(Render *re, Main *bmain, Scene *scene, SceneRenderLayer *srl, Object *camera_override, unsigned int lay, int frame, const short write_still)
{
        /* ugly global still... is to prevent preview events and signal subsurfs etc to make full resol */
        G.rendering= 1;
        
        scene->r.cfra= frame;
        
        if(render_initialize_from_main(re, bmain, scene, srl, camera_override, lay, 0, 0)) {
                MEM_reset_peak_memory();

                BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_PRE);

                do_render_all_options(re);

                if(write_still && !G.afbreek) {
                        if(BKE_imtype_is_movie(scene->r.imtype)) {
                                /* operator checks this but incase its called from elsewhere */
                                printf("Error: cant write single images with a movie format!\n");
                        }
                        else {
                                char name[FILE_MAX];
                                BKE_makepicstring(name, scene->r.pic, scene->r.cfra, scene->r.imtype, scene->r.scemode & R_EXTENSION, FALSE);
        
                                /* reports only used for Movie */
                                do_write_image_or_movie(re, scene, NULL, name);
                        }
                }

                BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_POST); /* keep after file save */
        }

        /* UGLY WARNING */
        G.rendering= 0;
}

static int do_write_image_or_movie(Render *re, Scene *scene, bMovieHandle *mh, const char *name_override)
{
        char name[FILE_MAX];
        RenderResult rres;
        Object *camera= RE_GetCamera(re);
        int ok= 1;
        
        RE_AcquireResultImage(re, &rres);

        /* write movie or image */
        if(BKE_imtype_is_movie(scene->r.imtype)) {
                int dofree = 0;
                /* note; the way it gets 32 bits rects is weak... */
                if(rres.rect32==NULL) {
                        rres.rect32= MEM_mapallocN(sizeof(int)*rres.rectx*rres.recty, "temp 32 bits rect");
                        dofree = 1;
                }
                RE_ResultGet32(re, (unsigned int *)rres.rect32);
                ok= mh->append_movie(&re->r, scene->r.cfra, rres.rect32, rres.rectx, rres.recty, re->reports);
                if(dofree) {
                        MEM_freeN(rres.rect32);
                }
                printf("Append frame %d", scene->r.cfra);
        } 
        else {
                if(name_override)
                        BLI_strncpy(name, name_override, sizeof(name));
                else
                        BKE_makepicstring(name, scene->r.pic, scene->r.cfra, scene->r.imtype, scene->r.scemode & R_EXTENSION, TRUE);
                
                if(re->r.imtype==R_MULTILAYER) {
                        if(re->result) {
                                RE_WriteRenderResult(re->result, name, scene->r.quality);
                                printf("Saved: %s", name);
                        }
                }
                else {
                        ImBuf *ibuf= IMB_allocImBuf(rres.rectx, rres.recty, scene->r.planes, 0);
                        
                        /* if not exists, BKE_write_ibuf makes one */
                        ibuf->rect= (unsigned int *)rres.rect32;    
                        ibuf->rect_float= rres.rectf;
                        ibuf->zbuf_float= rres.rectz;
                        
                        /* float factor for random dither, imbuf takes care of it */
                        ibuf->dither= scene->r.dither_intensity;
                        
                        /* prepare to gamma correct to sRGB color space */
                        if (scene->r.color_mgt_flag & R_COLOR_MANAGEMENT) {
                                /* sequence editor can generate 8bpc render buffers */
                                if (ibuf->rect) {
                                        ibuf->profile = IB_PROFILE_SRGB;
                                        if (ELEM(scene->r.imtype, R_OPENEXR, R_RADHDR))
                                                IMB_float_from_rect(ibuf);
                                } else {                                
                                        ibuf->profile = IB_PROFILE_LINEAR_RGB;
                                }
                        }

                        /* color -> greyscale */
                        /* editing directly would alter the render view */
                        if(scene->r.planes == 8) {
                                ImBuf *ibuf_bw= IMB_dupImBuf(ibuf);
                                IMB_color_to_bw(ibuf_bw);
                                IMB_freeImBuf(ibuf);
                                ibuf= ibuf_bw;
                        }

                        ok= BKE_write_ibuf_stamp(scene, camera, ibuf, name, scene->r.imtype, scene->r.subimtype, scene->r.quality);
                        
                        if(ok==0) {
                                printf("Render error: cannot save %s\n", name);
                        }
                        else printf("Saved: %s", name);
                        
                        /* optional preview images for exr */
                        if(ok && scene->r.imtype==R_OPENEXR && (scene->r.subimtype & R_PREVIEW_JPG)) {
                                if(BLI_testextensie(name, ".exr")) 
                                        name[strlen(name)-4]= 0;
                                BKE_add_image_extension(name, R_JPEG90);
                                ibuf->depth= 24; 
                                BKE_write_ibuf_stamp(scene, camera, ibuf, name, R_JPEG90, scene->r.subimtype, scene->r.quality);
                                printf("\nSaved: %s", name);
                        }
                        
                                        /* imbuf knows which rects are not part of ibuf */
                        IMB_freeImBuf(ibuf);
                }
        }
        
        RE_ReleaseResultImage(re);

        BLI_timestr(re->i.lastframetime, name);
        printf(" Time: %s\n", name);
        fflush(stdout); /* needed for renderd !! (not anymore... (ton)) */

        return ok;
}

/* saves images to disk */
void RE_BlenderAnim(Render *re, Main *bmain, Scene *scene, Object *camera_override, unsigned int lay, int sfra, int efra, int tfra)
{
        bMovieHandle *mh= BKE_get_movie_handle(scene->r.imtype);
        int cfrao= scene->r.cfra;
        int nfra;
        
        /* do not fully call for each frame, it initializes & pops output window */
        if(!render_initialize_from_main(re, bmain, scene, NULL, camera_override, lay, 0, 1))
                return;
        
        /* ugly global still... is to prevent renderwin events and signal subsurfs etc to make full resol */
        /* is also set by caller renderwin.c */
        G.rendering= 1;

        if(BKE_imtype_is_movie(scene->r.imtype))
                if(!mh->start_movie(scene, &re->r, re->rectx, re->recty, re->reports))
                        G.afbreek= 1;

        if (mh->get_next_frame) {
                while (!(G.afbreek == 1)) {
                        int nf = mh->get_next_frame(&re->r, re->reports);
                        if (nf >= 0 && nf >= scene->r.sfra && nf <= scene->r.efra) {
                                scene->r.cfra = re->r.cfra = nf;

                                BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_PRE);

                                do_render_all_options(re);

                                if(re->test_break(re->tbh) == 0) {
                                        if(!do_write_image_or_movie(re, scene, mh, NULL))
                                                G.afbreek= 1;
                                }

                                if(G.afbreek == 0) {
                                        BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_POST); /* keep after file save */
                                }
                        }
                        else {
                                if(re->test_break(re->tbh))
                                        G.afbreek= 1;
                        }
                }
        } else {
                for(nfra= sfra, scene->r.cfra= sfra; scene->r.cfra<=efra; scene->r.cfra++) {
                        char name[FILE_MAX];
                        
                        /* only border now, todo: camera lens. (ton) */
                        render_initialize_from_main(re, bmain, scene, NULL, camera_override, lay, 1, 0);

                        if(nfra!=scene->r.cfra) {
                                /*
                                 * Skip this frame, but update for physics and particles system.
                                 * From convertblender.c:
                                 * in localview, lamps are using normal layers, objects only local bits.
                                 */
                                unsigned int updatelay;

                                if(re->lay & 0xFF000000)
                                        updatelay= re->lay & 0xFF000000;
                                else
                                        updatelay= re->lay;

                                scene_update_for_newframe(bmain, scene, updatelay);
                                continue;
                        }
                        else
                                nfra+= tfra;

                        /* Touch/NoOverwrite options are only valid for image's */
                        if(BKE_imtype_is_movie(scene->r.imtype) == 0) {
                                if(scene->r.mode & (R_NO_OVERWRITE | R_TOUCH))
                                        BKE_makepicstring(name, scene->r.pic, scene->r.cfra, scene->r.imtype, scene->r.scemode & R_EXTENSION, TRUE);

                                if(scene->r.mode & R_NO_OVERWRITE && BLI_exist(name)) {
                                        printf("skipping existing frame \"%s\"\n", name);
                                        continue;
                                }
                                if(scene->r.mode & R_TOUCH && !BLI_exist(name)) {
                                        BLI_make_existing_file(name); /* makes the dir if its not there */
                                        BLI_touch(name);
                                }
                        }

                        re->r.cfra= scene->r.cfra;         /* weak.... */

                        /* run callbacs before rendering, before the scene is updated */
                        BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_PRE);

                        
                        do_render_all_options(re);
                        
                        if(re->test_break(re->tbh) == 0) {
                                if(!G.afbreek)
                                        if(!do_write_image_or_movie(re, scene, mh, NULL))
                                                G.afbreek= 1;
                        }
                        else
                                G.afbreek= 1;
                
                        if(G.afbreek==1) {
                                /* remove touched file */
                                if(BKE_imtype_is_movie(scene->r.imtype) == 0) {
                                        if (scene->r.mode & R_TOUCH && BLI_exist(name) && BLI_filepathsize(name) == 0) {
                                                BLI_delete(name, 0, 0);
                                        }
                                }
                                
                                break;
                        }

                        if(G.afbreek==0) {
                                BLI_exec_cb(re->main, (ID *)scene, BLI_CB_EVT_RENDER_POST); /* keep after file save */
                        }
                }
        }
        
        /* end movie */
        if(BKE_imtype_is_movie(scene->r.imtype))
                mh->end_movie();

        scene->r.cfra= cfrao;

        /* UGLY WARNING */
        G.rendering= 0;
}

void RE_PreviewRender(Render *re, Main *bmain, Scene *sce)
{
        Object *camera;
        int winx, winy;

        winx= (sce->r.size*sce->r.xsch)/100;
        winy= (sce->r.size*sce->r.ysch)/100;

        RE_InitState(re, NULL, &sce->r, NULL, winx, winy, NULL);

        re->main = bmain;
        re->scene = sce;
        re->lay = sce->lay;

        camera = RE_GetCamera(re);
        RE_SetCamera(re, camera);

        do_render_3d(re);
}

/* note; repeated win/disprect calc... solve that nicer, also in compo */

/* only the temp file! */
void RE_ReadRenderResult(Scene *scene, Scene *scenode)
{
        Render *re;
        int winx, winy;
        rcti disprect;
        
        /* calculate actual render result and display size */
        winx= (scene->r.size*scene->r.xsch)/100;
        winy= (scene->r.size*scene->r.ysch)/100;
        
        /* only in movie case we render smaller part */
        if(scene->r.mode & R_BORDER) {
                disprect.xmin= scene->r.border.xmin*winx;
                disprect.xmax= scene->r.border.xmax*winx;
                
                disprect.ymin= scene->r.border.ymin*winy;
                disprect.ymax= scene->r.border.ymax*winy;
        }
        else {
                disprect.xmin= disprect.ymin= 0;
                disprect.xmax= winx;
                disprect.ymax= winy;
        }
        
        if(scenode)
                scene= scenode;
        
        /* get render: it can be called from UI with draw callbacks */
        re= RE_GetRender(scene->id.name);
        if(re==NULL)
                re= RE_NewRender(scene->id.name);
        RE_InitState(re, NULL, &scene->r, NULL, winx, winy, &disprect);
        re->scene= scene;
        
        read_render_result(re, 0);
}

void RE_set_max_threads(int threads)
{
        if (threads==0) {
                RenderGlobal.threads = BLI_system_thread_count();
        } else if(threads>=1 && threads<=BLENDER_MAX_THREADS) {
                RenderGlobal.threads= threads;
        } else {
                printf("Error, threads has to be in range 0-%d\n", BLENDER_MAX_THREADS);
        }
}

void RE_init_threadcount(Render *re) 
{
        if(RenderGlobal.threads >= 1) { /* only set as an arg in background mode */
                re->r.threads= MIN2(RenderGlobal.threads, BLENDER_MAX_THREADS);
        } else if ((re->r.mode & R_FIXED_THREADS)==0 || RenderGlobal.threads == 0) { /* Automatic threads */
                re->r.threads = BLI_system_thread_count();
        }
}

/************************** External Engines ***************************/

RenderResult *RE_engine_begin_result(RenderEngine *engine, int x, int y, int w, int h)
{
        Render *re= engine->re;
        RenderResult *result;
        rcti disprect;

        /* ensure the coordinates are within the right limits */
        CLAMP(x, 0, re->result->rectx);
        CLAMP(y, 0, re->result->recty);
        CLAMP(w, 0, re->result->rectx);
        CLAMP(h, 0, re->result->recty);

        if(x + w > re->result->rectx)
                w= re->result->rectx - x;
        if(y + h > re->result->recty)
                h= re->result->recty - y;

        /* allocate a render result */
        disprect.xmin= x;
        disprect.xmax= x+w;
        disprect.ymin= y;
        disprect.ymax= y+h;

        if(0) { // XXX (re->r.scemode & R_FULL_SAMPLE)) {
                result= new_full_sample_buffers(re, &engine->fullresult, &disprect, 0);
        }
        else {
                result= new_render_result(re, &disprect, 0, RR_USEMEM);
                BLI_addtail(&engine->fullresult, result);
        }

        return result;
}

void RE_engine_update_result(RenderEngine *engine, RenderResult *result)
{
        Render *re= engine->re;

        if(result && render_display_draw_enabled(re)) {
                result->renlay= result->layers.first; // weak
                re->display_draw(re->ddh, result, NULL);
        }
}

void RE_engine_end_result(RenderEngine *engine, RenderResult *result)
{
        Render *re= engine->re;

        if(!result)
                return;

        /* merge */
        if(re->result->exrhandle) {
                RenderResult *rr, *rrpart;
                
                // XXX crashes, exr expects very particular part sizes
                for(rr= re->result, rrpart= result; rr && rrpart; rr= rr->next, rrpart= rrpart->next)
                        save_render_result_tile(rr, rrpart);
        }
        else if(render_display_draw_enabled(re)) {
                /* on break, don't merge in result for preview renders, looks nicer */
                if(re->test_break(re->tbh) && (re->r.scemode & R_PREVIEWBUTS));
                else merge_render_result(re->result, result);
        }

        /* draw */
        if(!re->test_break(re->tbh) && render_display_draw_enabled(re)) {
                result->renlay= result->layers.first; // weak
                re->display_draw(re->ddh, result, NULL);
        }

        /* free */
        free_render_result(&engine->fullresult, result);
}

int RE_engine_test_break(RenderEngine *engine)
{
        Render *re= engine->re;

        return re->test_break(re->tbh);
}

void RE_engine_update_stats(RenderEngine *engine, const char *stats, const char *info)
{
        Render *re= engine->re;

        re->i.statstr= stats;
        re->i.infostr= info;
        re->stats_draw(re->sdh, &re->i);
        re->i.infostr= NULL;
        re->i.statstr= NULL;
}

void RE_engine_report(RenderEngine *engine, int type, const char *msg)
{
        BKE_report(engine->re->reports, type, msg);
}

/* loads in image into a result, size must match
 * x/y offsets are only used on a partial copy when dimensions dont match */
void RE_layer_load_from_file(RenderLayer *layer, ReportList *reports, const char *filename, int x, int y)
{
        ImBuf *ibuf = IMB_loadiffname(filename, IB_rect);

        if(ibuf  && (ibuf->rect || ibuf->rect_float)) {
                if (ibuf->x == layer->rectx && ibuf->y == layer->recty) {
                        if(ibuf->rect_float==NULL)
                                IMB_float_from_rect(ibuf);

                        memcpy(layer->rectf, ibuf->rect_float, sizeof(float)*4*layer->rectx*layer->recty);
                } else {
                        if ((ibuf->x - x >= layer->rectx) && (ibuf->y - y >= layer->recty)) {
                                ImBuf *ibuf_clip;

                                if(ibuf->rect_float==NULL)
                                        IMB_float_from_rect(ibuf);

                                ibuf_clip = IMB_allocImBuf(layer->rectx, layer->recty, 32, IB_rectfloat);
                                if(ibuf_clip) {
                                        IMB_rectcpy(ibuf_clip, ibuf, 0,0, x,y, layer->rectx, layer->recty);

                                        memcpy(layer->rectf, ibuf_clip->rect_float, sizeof(float)*4*layer->rectx*layer->recty);
                                        IMB_freeImBuf(ibuf_clip);
                                }
                                else {
                                        BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: failed to allocate clip buffer '%s'\n", filename);
                                }
                        }
                        else {
                                BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: incorrect dimensions for partial copy '%s'\n", filename);
                        }
                }

                IMB_freeImBuf(ibuf);
        }
        else {
                BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: failed to load '%s'\n", filename);
        }
}

void RE_result_load_from_file(RenderResult *result, ReportList *reports, const char *filename)
{
        if(!read_render_result_from_file(filename, result)) {
                BKE_reportf(reports, RPT_ERROR, "RE_result_rect_from_file: failed to load '%s'\n", filename);
                return;
        }
}

static int external_render_3d(Render *re, int do_all)
{
        RenderEngineType *type= BLI_findstring(&R_engines, re->r.engine, offsetof(RenderEngineType, idname));
        RenderEngine engine;

        if(!(type && type->render))
                return 0;
        if((re->r.scemode & R_PREVIEWBUTS) && !(type->flag & RE_DO_PREVIEW))
                return 0;
        if(do_all && !(type->flag & RE_DO_ALL))
                return 0;
        if(!do_all && (type->flag & RE_DO_ALL))
                return 0;

        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        if(re->result==NULL || !(re->r.scemode & R_PREVIEWBUTS)) {
                RE_FreeRenderResult(re->result);
        
                if(0) // XXX re->r.scemode & R_FULL_SAMPLE)
                        re->result= new_full_sample_buffers_exr(re);
                else
                        re->result= new_render_result(re, &re->disprect, 0, 0); // XXX re->r.scemode & (R_EXR_TILE_FILE|R_FULL_SAMPLE));
        }
        BLI_rw_mutex_unlock(&re->resultmutex);
        
        if(re->result==NULL)
                return 1;

        /* external */
        memset(&engine, 0, sizeof(engine));
        engine.type= type;
        engine.re= re;

        type->render(&engine, re->scene);

        free_render_result(&engine.fullresult, engine.fullresult.first);

        BLI_rw_mutex_lock(&re->resultmutex, THREAD_LOCK_WRITE);
        if(re->result->exrhandle) {
                RenderResult *rr;

                save_empty_result_tiles(re);
                
                for(rr= re->result; rr; rr= rr->next) {
                        IMB_exr_close(rr->exrhandle);
                        rr->exrhandle= NULL;
                }
                
                free_render_result(&re->fullresult, re->result);
                re->result= NULL;
                
                read_render_result(re, 0);
        }
        BLI_rw_mutex_unlock(&re->resultmutex);

        return 1;
}