SHD_geom.c

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/*
 * $Id: SHD_geom.c 36276 2011-04-21 15:53:30Z campbellbarton $
 *
 * ***** 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) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "../SHD_util.h"

#include "DNA_customdata_types.h"

/* **************** GEOMETRY  ******************** */

/* output socket type definition */
static bNodeSocketType sh_node_geom_out[]= {
        {       SOCK_VECTOR, 0, "Global",       0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},   /* btw; uses no limit */
        {       SOCK_VECTOR, 0, "Local",        0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
        {       SOCK_VECTOR, 0, "View", 0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
        {       SOCK_VECTOR, 0, "Orco", 0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
        {       SOCK_VECTOR, 0, "UV",   0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
        {       SOCK_VECTOR, 0, "Normal",       0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
        {       SOCK_RGBA,   0, "Vertex Color", 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {       SOCK_VALUE,   0, "Front/Back", 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {       -1, 0, ""       }
};

/* node execute callback */
static void node_shader_exec_geom(void *data, bNode *node, bNodeStack **UNUSED(in), bNodeStack **out)
{
        if(data) {
                ShadeInput *shi= ((ShaderCallData *)data)->shi;
                NodeGeometry *ngeo= (NodeGeometry*)node->storage;
                ShadeInputUV *suv= &shi->uv[shi->actuv];
                static float defaultvcol[4] = {1.0f, 1.0f, 1.0f, 1.0f};
                int i;

                if(ngeo->uvname[0]) {
                        /* find uv layer by name */
                        for(i = 0; i < shi->totuv; i++) {
                                if(strcmp(shi->uv[i].name, ngeo->uvname)==0) {
                                        suv= &shi->uv[i];
                                        break;
                                }
                        }
                }

                /* out: global, local, view, orco, uv, normal, vertex color */
                VECCOPY(out[GEOM_OUT_GLOB]->vec, shi->gl);
                VECCOPY(out[GEOM_OUT_LOCAL]->vec, shi->co);
                VECCOPY(out[GEOM_OUT_VIEW]->vec, shi->view);
                VECCOPY(out[GEOM_OUT_ORCO]->vec, shi->lo);
                VECCOPY(out[GEOM_OUT_UV]->vec, suv->uv);
                VECCOPY(out[GEOM_OUT_NORMAL]->vec, shi->vno);

                if (shi->totcol) {
                        /* find vertex color layer by name */
                        ShadeInputCol *scol= &shi->col[0];

                        if(ngeo->colname[0]) {
                                for(i = 0; i < shi->totcol; i++) {
                                        if(strcmp(shi->col[i].name, ngeo->colname)==0) {
                                                scol= &shi->col[i];
                                                break;
                                        }
                                }
                        }

                        VECCOPY(out[GEOM_OUT_VCOL]->vec, scol->col);
                        out[GEOM_OUT_VCOL]->vec[3]= 1.0f;
                }
                else
                        memcpy(out[GEOM_OUT_VCOL]->vec, defaultvcol, sizeof(defaultvcol));
                
                if(shi->osatex) {
                        out[GEOM_OUT_GLOB]->data= shi->dxgl;
                        out[GEOM_OUT_GLOB]->datatype= NS_OSA_VECTORS;
                        out[GEOM_OUT_LOCAL]->data= shi->dxco;
                        out[GEOM_OUT_LOCAL]->datatype= NS_OSA_VECTORS;
                        out[GEOM_OUT_VIEW]->data= &shi->dxview;
                        out[GEOM_OUT_VIEW]->datatype= NS_OSA_VALUES;
                        out[GEOM_OUT_ORCO]->data= shi->dxlo;
                        out[GEOM_OUT_ORCO]->datatype= NS_OSA_VECTORS;
                        out[GEOM_OUT_UV]->data= suv->dxuv;
                        out[GEOM_OUT_UV]->datatype= NS_OSA_VECTORS;
                        out[GEOM_OUT_NORMAL]->data= shi->dxno;
                        out[GEOM_OUT_NORMAL]->datatype= NS_OSA_VECTORS;
                }
                
                /* front/back, normal flipping was stored */
                out[GEOM_OUT_FRONTBACK]->vec[0]= (shi->flippednor)? 0.0f: 1.0f;
        }
}

static void node_shader_init_geometry(bNode *node)
{
        node->storage= MEM_callocN(sizeof(NodeGeometry), "NodeGeometry");
}

static int gpu_shader_geom(GPUMaterial *mat, bNode *node, GPUNodeStack *in, GPUNodeStack *out)
{
        NodeGeometry *ngeo= (NodeGeometry*)node->storage;
        GPUNodeLink *orco = GPU_attribute(CD_ORCO, "");
        GPUNodeLink *mtface = GPU_attribute(CD_MTFACE, ngeo->uvname);
        GPUNodeLink *mcol = GPU_attribute(CD_MCOL, ngeo->colname);

        return GPU_stack_link(mat, "geom", in, out,
                GPU_builtin(GPU_VIEW_POSITION), GPU_builtin(GPU_VIEW_NORMAL),
                GPU_builtin(GPU_INVERSE_VIEW_MATRIX), orco, mtface, mcol);
}

/* node type definition */
void register_node_type_sh_geom(ListBase *lb)
{
        static bNodeType ntype;

        node_type_base(&ntype, SH_NODE_GEOMETRY, "Geometry", NODE_CLASS_INPUT, NODE_OPTIONS,
                NULL, sh_node_geom_out);
        node_type_size(&ntype, 120, 80, 160);
        node_type_init(&ntype, node_shader_init_geometry);
        node_type_storage(&ntype, "NodeGeometry", node_free_standard_storage, node_copy_standard_storage);
        node_type_exec(&ntype, node_shader_exec_geom);
        node_type_gpu(&ntype, gpu_shader_geom);

        nodeRegisterType(lb, &ntype);
}