nla_draw.c

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/*
 * $Id: nla_draw.c 35824 2011-03-27 17:22:04Z 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) 2009 Blender Foundation, Joshua Leung
 * All rights reserved.
 *
 * 
 * Contributor(s): Joshua Leung (major recode)
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>

#include "DNA_anim_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_windowmanager_types.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_rand.h"
#include "BLI_dlrbTree.h"
#include "BLI_utildefines.h"

#include "BKE_fcurve.h"
#include "BKE_nla.h"
#include "BKE_context.h"
#include "BKE_screen.h"

#include "ED_anim_api.h"
#include "ED_keyframes_draw.h"

#include "BIF_gl.h"
#include "BIF_glutil.h"

#include "WM_types.h"

#include "UI_interface.h"
#include "UI_interface_icons.h"
#include "UI_resources.h"
#include "UI_view2d.h"


#include "nla_intern.h" // own include


/* *********************************************** */
/* Strips */

/* Action-Line ---------------------- */

/* get colors for drawing Action-Line 
 * NOTE: color returned includes fine-tuned alpha!
 */
static void nla_action_get_color (AnimData *adt, bAction *act, float color[4])
{
        // TODO: if tweaking some action, use the same color as for the tweaked track (quick hack done for now)
        if (adt && (adt->flag & ADT_NLA_EDIT_ON)) {
                // greenish color (same as tweaking strip) - hardcoded for now
                color[0]= 0.30f;
                color[1]= 0.95f;
                color[2]= 0.10f;
                color[3]= 0.30f;
        }
        else {
                if (act) {
                        // reddish color - hardcoded for now    
                        color[0]= 0.8f;
                        color[1]= 0.2f;
                        color[2]= 0.0f;
                        color[3]= 0.4f;
                }
                else {
                        // greyish-red color - hardcoded for now
                        color[0]= 0.6f;
                        color[1]= 0.5f;
                        color[2]= 0.5f;
                        color[3]= 0.3f;
                }
        }
}

/* draw the keyframes in the specified Action */
static void nla_action_draw_keyframes (AnimData *adt, bAction *act, View2D *v2d, float y, float ymin, float ymax)
{
        DLRBT_Tree keys;
        ActKeyColumn *ak;
        float xscale, f1, f2;
        float color[4];
        
        /* get a list of the keyframes with NLA-scaling applied */
        BLI_dlrbTree_init(&keys);
        action_to_keylist(adt, act, &keys, NULL);
        BLI_dlrbTree_linkedlist_sync(&keys);
        
        if ELEM(NULL, act, keys.first)
                return;
        
        /* draw a darkened region behind the strips 
         *      - get and reset the background color, this time without the alpha to stand out better 
         */
        nla_action_get_color(adt, act, color);
        glColor3fv(color);
        /*      - draw a rect from the first to the last frame (no extra overlaps for now) 
         *        that is slightly stumpier than the track background (hardcoded 2-units here)
         */
        f1= ((ActKeyColumn *)keys.first)->cfra;
        f2= ((ActKeyColumn *)keys.last)->cfra;
        
        glRectf(f1, ymin+2, f2, ymax-2);
        
        
        /* get View2D scaling factor */
        UI_view2d_getscale(v2d, &xscale, NULL);
        
        /* for now, color is hardcoded to be black */
        glColor3f(0.0f, 0.0f, 0.0f);
        
        /* just draw each keyframe as a simple dot (regardless of the selection status) 
         *      - size is 3.0f which is smaller than the editable keyframes, so that there is a distinction
         */
        for (ak= keys.first; ak; ak= ak->next)
                draw_keyframe_shape(ak->cfra, y, xscale, 3.0f, 0, ak->key_type, KEYFRAME_SHAPE_FRAME, 1.0f);
        
        /* free icons */
        BLI_dlrbTree_free(&keys);
}

/* Strips (Proper) ---------------------- */

/* get colors for drawing NLA-Strips */
static void nla_strip_get_color_inside (AnimData *adt, NlaStrip *strip, float color[3])
{
        if (strip->type == NLASTRIP_TYPE_TRANSITION) {
                /* Transition Clip */
                if (strip->flag & NLASTRIP_FLAG_SELECT) {
                        /* selected - use a bright blue color */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.18f;
                        color[1]= 0.46f;
                        color[2]= 0.86f;
                }
                else {
                        /* normal, unselected strip - use (hardly noticable) blue tinge */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.11f;
                        color[1]= 0.15f;
                        color[2]= 0.19f;
                }
        }       
        else if (strip->type == NLASTRIP_TYPE_META) {
                /* Meta Clip */
                // TODO: should temporary metas get different colors too?
                if (strip->flag & NLASTRIP_FLAG_SELECT) {
                        /* selected - use a bold purple color */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.41f;
                        color[1]= 0.13f;
                        color[2]= 0.59f;
                }
                else {
                        /* normal, unselected strip - use (hardly noticable) dark purple tinge */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.20f;
                        color[1]= 0.15f;
                        color[2]= 0.26f;
                }
        }       
        else {
                /* Action Clip (default/normal type of strip) */
                if ((strip->flag & NLASTRIP_FLAG_ACTIVE) && (adt && (adt->flag & ADT_NLA_EDIT_ON))) {
                        /* active strip should be drawn green when it is acting as the tweaking strip.
                         * however, this case should be skipped for when not in EditMode...
                         */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.3f;
                        color[1]= 0.95f;
                        color[2]= 0.1f;
                }
                else if (strip->flag & NLASTRIP_FLAG_TWEAKUSER) {
                        /* alert user that this strip is also used by the tweaking track (this is set when going into
                         * 'editmode' for that strip), since the edits made here may not be what the user anticipated
                         */
                        // FIXME: hardcoded temp-hack colors
                        color[0]= 0.85f;
                        color[1]= 0.0f;
                        color[2]= 0.0f;
                }
                else if (strip->flag & NLASTRIP_FLAG_SELECT) {
                        /* selected strip - use theme color for selected */
                        UI_GetThemeColor3fv(TH_STRIP_SELECT, color);
                }
                else {
                        /* normal, unselected strip - use standard strip theme color */
                        UI_GetThemeColor3fv(TH_STRIP, color);
                }
        }
}

/* helper call for drawing influence/time control curves for a given NLA-strip */
static void nla_draw_strip_curves (NlaStrip *strip, float yminc, float ymaxc)
{
        const float yheight = ymaxc - yminc;
        
        /* drawing color is simply a light-grey */
        // TODO: is this color suitable?
        // XXX nasty hacked color for now... which looks quite bad too...
        glColor3f(0.7f, 0.7f, 0.7f);
        
        /* draw with AA'd line */
        glEnable(GL_LINE_SMOOTH);
        glEnable(GL_BLEND);
        
        /* influence -------------------------- */
        if (strip->flag & NLASTRIP_FLAG_USR_INFLUENCE) {
                FCurve *fcu= list_find_fcurve(&strip->fcurves, "influence", 0);
                float cfra;
                
                /* plot the curve (over the strip's main region) */
                glBegin(GL_LINE_STRIP);
                        /* sample at 1 frame intervals, and draw 
                         *      - min y-val is yminc, max is y-maxc, so clamp in those regions
                         */
                        for (cfra= strip->start; cfra <= strip->end; cfra += 1.0f) {
                                float y= evaluate_fcurve(fcu, cfra); // assume this to be in 0-1 range
                                glVertex2f(cfra, ((y*yheight)+yminc));
                        }
                glEnd(); // GL_LINE_STRIP
        }
        else {
                /* use blend in/out values only if both aren't zero */
                if ((IS_EQF(strip->blendin, 0.0f) && IS_EQF(strip->blendout, 0.0f))==0) {
                        glBegin(GL_LINE_STRIP);
                                /* start of strip - if no blendin, start straight at 1, otherwise from 0 to 1 over blendin frames */
                                if (IS_EQF(strip->blendin, 0.0f) == 0) {
                                        glVertex2f(strip->start,                                        yminc);
                                        glVertex2f(strip->start + strip->blendin,       ymaxc);
                                }
                                else
                                        glVertex2f(strip->start, ymaxc);
                                        
                                /* end of strip */
                                if (IS_EQF(strip->blendout, 0.0f) == 0) {
                                        glVertex2f(strip->end - strip->blendout,        ymaxc);
                                        glVertex2f(strip->end,                                          yminc);
                                }
                                else
                                        glVertex2f(strip->end, ymaxc);
                        glEnd(); // GL_LINE_STRIP
                }
        }
        
        /* time -------------------------- */
        // XXX do we want to draw this curve? in a different color too?
        
        /* turn off AA'd lines */
        glDisable(GL_LINE_SMOOTH);
        glDisable(GL_BLEND);
}

/* main call for drawing a single NLA-strip */
static void nla_draw_strip (SpaceNla *snla, AnimData *adt, NlaTrack *UNUSED(nlt), NlaStrip *strip, View2D *v2d, float yminc, float ymaxc)
{
        float color[3];
        
        /* get color of strip */
        nla_strip_get_color_inside(adt, strip, color);
        
        /* draw extrapolation info first (as backdrop) */
        if (strip->extendmode != NLASTRIP_EXTEND_NOTHING) {
                /* enable transparency... */
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                glEnable(GL_BLEND);
                
                switch (strip->extendmode) {
                        /* since this does both sides, only do the 'before' side, and leave the rest to the next case */
                        case NLASTRIP_EXTEND_HOLD: 
                                /* only need to draw here if there's no strip before since 
                                 * it only applies in such a situation 
                                 */
                                if (strip->prev == NULL) {
                                        /* set the drawing color to the color of the strip, but with very faint alpha */
                                        glColor4f(color[0], color[1], color[2], 0.15f);
                                        
                                        /* draw the rect to the edge of the screen */
                                        glBegin(GL_QUADS);
                                                glVertex2f(v2d->cur.xmin, yminc);
                                                glVertex2f(v2d->cur.xmin, ymaxc);
                                                glVertex2f(strip->start, ymaxc);
                                                glVertex2f(strip->start, yminc);
                                        glEnd();
                                }
                                /* no break needed... */
                                
                        /* this only draws after the strip */
                        case NLASTRIP_EXTEND_HOLD_FORWARD: 
                                /* only need to try and draw if the next strip doesn't occur immediately after */
                                if ((strip->next == NULL) || (IS_EQF(strip->next->start, strip->end)==0)) {
                                        /* set the drawing color to the color of the strip, but this time less faint */
                                        glColor4f(color[0], color[1], color[2], 0.3f);
                                        
                                        /* draw the rect to the next strip or the edge of the screen */
                                        glBegin(GL_QUADS);
                                                glVertex2f(strip->end, yminc);
                                                glVertex2f(strip->end, ymaxc);
                                                
                                                if (strip->next) {
                                                        glVertex2f(strip->next->start, ymaxc);
                                                        glVertex2f(strip->next->start, yminc);
                                                }
                                                else {
                                                        glVertex2f(v2d->cur.xmax, ymaxc);
                                                        glVertex2f(v2d->cur.xmax, yminc);
                                                }
                                        glEnd();
                                }
                                break;
                }
                
                glDisable(GL_BLEND);
        }
        
        /* draw 'inside' of strip itself */
        glColor3fv(color);
        uiSetRoundBox(15); /* all corners rounded */
        uiDrawBoxShade(GL_POLYGON, strip->start, yminc, strip->end, ymaxc, 0.0, 0.5, 0.1);
        
        
        /* draw strip's control 'curves'
         *      - only if user hasn't hidden them...
         */
        if ((snla->flag & SNLA_NOSTRIPCURVES) == 0)
                nla_draw_strip_curves(strip, yminc, ymaxc);
        
        /* draw strip outline 
         *      - color used here is to indicate active vs non-active
         */
        if (strip->flag & NLASTRIP_FLAG_ACTIVE) {
                /* strip should appear 'sunken', so draw a light border around it */
                glColor3f(0.9f, 1.0f, 0.9f); // FIXME: hardcoded temp-hack colors
        }
        else {
                /* strip should appear to stand out, so draw a dark border around it */
                glColor3f(0.0f, 0.0f, 0.0f);
        }
        
        /* - line style: dotted for muted */
        if (strip->flag & NLASTRIP_FLAG_MUTED)
                setlinestyle(4);
                
        /* draw outline */
        uiDrawBoxShade(GL_LINE_LOOP, strip->start, yminc, strip->end, ymaxc, 0.0, 0.0, 0.1);
        
        /* if action-clip strip, draw lines delimiting repeats too (in the same color as outline) */
        if ((strip->type == NLASTRIP_TYPE_CLIP) && IS_EQF(strip->repeat, 1.0f)==0) {
                float repeatLen = (strip->actend - strip->actstart) * strip->scale;
                int i;
                
                /* only draw lines for whole-numbered repeats, starting from the first full-repeat
                 * up to the last full repeat (but not if it lies on the end of the strip)
                 */
                for (i = 1; i < strip->repeat; i++) {
                        float repeatPos = strip->start + (repeatLen * i);
                        
                        /* don't draw if line would end up on or after the end of the strip */
                        if (repeatPos < strip->end)
                                fdrawline(repeatPos, yminc+4, repeatPos, ymaxc-4);
                }
        }
        /* or if meta-strip, draw lines delimiting extents of sub-strips (in same color as outline, if more than 1 exists) */
        else if ((strip->type == NLASTRIP_TYPE_META) && (strip->strips.first != strip->strips.last)) {
                NlaStrip *cs;
                float y= (ymaxc-yminc)/2.0f + yminc;
                
                /* only draw first-level of child-strips, but don't draw any lines on the endpoints */
                for (cs= strip->strips.first; cs; cs= cs->next) {
                        /* draw start-line if not same as end of previous (and only if not the first strip) 
                         *      - on upper half of strip
                         */
                        if ((cs->prev) && IS_EQF(cs->prev->end, cs->start)==0)
                                fdrawline(cs->start, y, cs->start, ymaxc);
                                
                        /* draw end-line if not the last strip
                         *      - on lower half of strip
                         */
                        if (cs->next) 
                                fdrawline(cs->end, yminc, cs->end, y);
                }
        }
        
        /* reset linestyle */
        setlinestyle(0);
} 

/* add the relevant text to the cache of text-strings to draw in pixelspace */
static void nla_draw_strip_text (NlaTrack *UNUSED(nlt), NlaStrip *strip, int UNUSED(index), View2D *v2d, float yminc, float ymaxc)
{
        char str[256], dir[3];
        char col[4];
        rctf rect;
        
        /* 'dir' - direction that strip is played in */
        if (strip->flag & NLASTRIP_FLAG_REVERSE)
                sprintf(dir, "<-");
        else
                sprintf(dir, "->");
        
        /* just print the name and the range */
        if (strip->flag & NLASTRIP_FLAG_TEMP_META)
                sprintf(str, "Temp-Meta | %.2f %s %.2f", strip->start, dir, strip->end);
        else
                sprintf(str, "%s | %.2f %s %.2f", strip->name, strip->start, dir, strip->end);
        
        /* set text color - if colors (see above) are light, draw black text, otherwise draw white */
        if (strip->flag & (NLASTRIP_FLAG_ACTIVE|NLASTRIP_FLAG_SELECT|NLASTRIP_FLAG_TWEAKUSER)) {
                col[0]= col[1]= col[2]= 0;
        }
        else {
                col[0]= col[1]= col[2]= 255;
        }
        col[3]= 1.0;

        /* set bounding-box for text 
         *      - padding of 2 'units' on either side
         */
        // TODO: make this centered?
        rect.xmin= strip->start + 0.5f;
        rect.ymin= yminc;
        rect.xmax= strip->end - 0.5f;
        rect.ymax= ymaxc;
        
        /* add this string to the cache of texts to draw*/

        UI_view2d_text_cache_rectf(v2d, &rect, str, col);
}

/* ---------------------- */

void draw_nla_main_data (bAnimContext *ac, SpaceNla *snla, ARegion *ar)
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        View2D *v2d= &ar->v2d;
        float y= 0.0f;
        int items, height;
        
        /* build list of channels to draw */
        filter= (ANIMFILTER_VISIBLE|ANIMFILTER_CHANNELS);
        items= ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* Update max-extent of channels here (taking into account scrollers):
         *      - this is done to allow the channel list to be scrollable, but must be done here
         *        to avoid regenerating the list again and/or also because channels list is drawn first
         *      - offset of NLACHANNEL_HEIGHT*2 is added to the height of the channels, as first is for 
         *        start of list offset, and the second is as a correction for the scrollers.
         */
        height= ((items*NLACHANNEL_STEP) + (NLACHANNEL_HEIGHT*2));
        /* don't use totrect set, as the width stays the same 
         * (NOTE: this is ok here, the configuration is pretty straightforward) 
         */
        v2d->tot.ymin= (float)(-height);
        
        /* loop through channels, and set up drawing depending on their type  */        
        y= (float)(-NLACHANNEL_HEIGHT);
        
        for (ale= anim_data.first; ale; ale= ale->next) {
                const float yminc= (float)(y - NLACHANNEL_HEIGHT_HALF);
                const float ymaxc= (float)(y + NLACHANNEL_HEIGHT_HALF);
                
                /* check if visible */
                if ( IN_RANGE(yminc, v2d->cur.ymin, v2d->cur.ymax) ||
                         IN_RANGE(ymaxc, v2d->cur.ymin, v2d->cur.ymax) ) 
                {
                        /* data to draw depends on the type of channel */
                        switch (ale->type) {
                                case ANIMTYPE_NLATRACK:
                                {
                                        AnimData *adt= ale->adt;
                                        NlaTrack *nlt= (NlaTrack *)ale->data;
                                        NlaStrip *strip;
                                        int index;
                                        
                                        /* draw each strip in the track (if visible) */
                                        for (strip=nlt->strips.first, index=1; strip; strip=strip->next, index++) {
                                                if (BKE_nlastrip_within_bounds(strip, v2d->cur.xmin, v2d->cur.xmax)) {
                                                        /* draw the visualisation of the strip */
                                                        nla_draw_strip(snla, adt, nlt, strip, v2d, yminc, ymaxc);
                                                        
                                                        /* add the text for this strip to the cache */
                                                        nla_draw_strip_text(nlt, strip, index, v2d, yminc, ymaxc);
                                                }
                                        }
                                }
                                        break;
                                        
                                case ANIMTYPE_NLAACTION:
                                {
                                        AnimData *adt= ale->adt;
                                        float color[4];
                                        
                                        /* just draw a semi-shaded rect spanning the width of the viewable area if there's data,
                                         * and a second darker rect within which we draw keyframe indicator dots if there's data
                                         */
                                        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                                        glEnable(GL_BLEND);
                                                
                                        /* get colors for drawing */
                                        nla_action_get_color(adt, ale->data, color);
                                        glColor4fv(color);
                                        
                                        /* draw slightly shifted up for greater separation from standard channels,
                                         * but also slightly shorter for some more contrast when viewing the strips
                                         */
                                        glRectf(v2d->cur.xmin, yminc+NLACHANNEL_SKIP, v2d->cur.xmax, ymaxc-NLACHANNEL_SKIP);
                                        
                                        /* draw keyframes in the action */
                                        nla_action_draw_keyframes(adt, ale->data, v2d, y, yminc+NLACHANNEL_SKIP, ymaxc-NLACHANNEL_SKIP);
                                        
                                        /* draw 'embossed' lines above and below the strip for effect */
                                                /* white base-lines */
                                        glLineWidth(2.0f);
                                        glColor4f(1.0f, 1.0f, 1.0f, 0.3);
                                        fdrawline(v2d->cur.xmin, yminc+NLACHANNEL_SKIP, v2d->cur.xmax, yminc+NLACHANNEL_SKIP);
                                        fdrawline(v2d->cur.xmin, ymaxc-NLACHANNEL_SKIP, v2d->cur.xmax, ymaxc-NLACHANNEL_SKIP);
                                        
                                                /* black top-lines */
                                        glLineWidth(1.0f);
                                        glColor3f(0.0f, 0.0f, 0.0f);
                                        fdrawline(v2d->cur.xmin, yminc+NLACHANNEL_SKIP, v2d->cur.xmax, yminc+NLACHANNEL_SKIP);
                                        fdrawline(v2d->cur.xmin, ymaxc-NLACHANNEL_SKIP, v2d->cur.xmax, ymaxc-NLACHANNEL_SKIP);
                                        
                                        glDisable(GL_BLEND);
                                }
                                        break;
                        }
                }
                
                /* adjust y-position for next one */
                y -= NLACHANNEL_STEP;
        }
        
        /* free tempolary channels */
        BLI_freelistN(&anim_data);
}

/* *********************************************** */
/* Channel List */

/* old code for drawing NLA channels using GL only */
// TODO: depreceate this code...
static void draw_nla_channel_list_gl (bAnimContext *ac, ListBase *anim_data, View2D *v2d, float y)
{
        bAnimListElem *ale;
        float x = 0.0f;
        
        /* loop through channels, and set up drawing depending on their type  */        
        for (ale= anim_data->first; ale; ale= ale->next) {
                const float yminc= (float)(y - NLACHANNEL_HEIGHT_HALF);
                const float ymaxc= (float)(y + NLACHANNEL_HEIGHT_HALF);
                const float ydatac= (float)(y - 7);
                
                /* check if visible */
                if ( IN_RANGE(yminc, v2d->cur.ymin, v2d->cur.ymax) ||
                         IN_RANGE(ymaxc, v2d->cur.ymin, v2d->cur.ymax) ) 
                {
                        short indent= 0, offset= 0, sel= 0, group= 0;
                        int expand= -1, protect = -1, special= -1, mute = -1;
                        char name[128];
                        short doDraw=0;
                        
                        /* determine what needs to be drawn */
                        switch (ale->type) {
                                case ANIMTYPE_NLATRACK: /* NLA Track */
                                {
                                        NlaTrack *nlt= (NlaTrack *)ale->data;
                                        
                                        indent= 0;
                                        
                                        if (ale->id) {
                                                /* special exception for materials and particles */
                                                if (ELEM(GS(ale->id->name),ID_MA,ID_PA)) {
                                                        offset= 21;
                                                        indent= 1;
                                                }
                                                else
                                                        offset= 14;
                                        }
                                        else
                                                offset= 0;
                                        
                                        /* FIXME: 'solo' as the 'special' button?
                                         *      - need special icons for these
                                         */
                                        if (nlt->flag & NLATRACK_SOLO)
                                                special= ICON_LAYER_ACTIVE;
                                        else
                                                special= ICON_LAYER_USED;
                                                
                                        /* if this track is active and we're tweaking it, don't draw these toggles */
                                        // TODO: need a special macro for this...
                                        if ( ((nlt->flag & NLATRACK_ACTIVE) && (nlt->flag & NLATRACK_DISABLED)) == 0 ) 
                                        {
                                                if (nlt->flag & NLATRACK_MUTED)
                                                        mute = ICON_MUTE_IPO_ON;
                                                else    
                                                        mute = ICON_MUTE_IPO_OFF;
                                                        
                                                if (EDITABLE_NLT(nlt))
                                                        protect = ICON_UNLOCKED;
                                                else
                                                        protect = ICON_LOCKED;
                                        }
                                                
                                        sel = SEL_NLT(nlt);
                                        strcpy(name, nlt->name);
                                        
                                        // draw manually still
                                        doDraw= 1;
                                }
                                        break;
                                case ANIMTYPE_NLAACTION: /* NLA Action-Line */
                                {
                                        bAction *act= (bAction *)ale->data;
                                        
                                        group = 5;
                                        
                                        if (ale->id) {
                                                /* special exception for materials and particles */
                                                if (ELEM(GS(ale->id->name),ID_MA,ID_PA)) {
                                                        offset= 21;
                                                        indent= 1;
                                                }
                                                else
                                                        offset= 14;
                                        }
                                        else
                                                offset= 0;
                                        
                                        special = ICON_ACTION;
                                        
                                        if (act)
                                                sprintf(name, "ActAction: <%s>", act->id.name+2);
                                        else
                                                sprintf(name, "<No Action>");
                                                
                                        // draw manually still
                                        doDraw= 1;
                                }
                                        break;
                                        
                                default: /* handled by standard channel-drawing API */
                                        // draw backdrops only...
                                        ANIM_channel_draw(ac, ale, yminc, ymaxc);
                                        break;
                        }       
                        
                        /* if special types, draw manually for now... */
                        if (doDraw) {
                                /* now, start drawing based on this information */
                                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                                glEnable(GL_BLEND);
                                
                                /* draw backing strip behind channel name */
                                if (group == 5) {
                                        /* Action Line */
                                        AnimData *adt= ale->adt;
                                        
                                        // TODO: if tweaking some action, use the same color as for the tweaked track (quick hack done for now)
                                        if (adt && (adt->flag & ADT_NLA_EDIT_ON)) {
                                                // greenish color (same as tweaking strip) - hardcoded for now
                                                glColor3f(0.3f, 0.95f, 0.1f);
                                        }
                                        else {
                                                if (ale->data)
                                                        glColor3f(0.8f, 0.2f, 0.0f);    // reddish color - hardcoded for now 
                                                else
                                                        glColor3f(0.6f, 0.5f, 0.5f);    // greyish-red color - hardcoded for now
                                        }
                                        
                                        offset += 7 * indent;
                                        
                                        /* only on top two corners, to show that this channel sits on top of the preceding ones */
                                        uiSetRoundBox((1|2)); 
                                        
                                        /* draw slightly shifted up vertically to look like it has more separtion from other channels,
                                         * but we then need to slightly shorten it so that it doesn't look like it overlaps
                                         */
                                        uiDrawBox(GL_POLYGON, x+offset,  yminc+NLACHANNEL_SKIP, (float)v2d->cur.xmax, ymaxc+NLACHANNEL_SKIP-1, 8);
                                        
                                        /* clear group value, otherwise we cause errors... */
                                        group = 0;
                                }
                                else {
                                        /* for normal channels 
                                         *      - use 3 shades of color group/standard color for 3 indention level
                                         */
                                        UI_ThemeColorShade(TH_HEADER, ((indent==0)?20: (indent==1)?-20: -40));
                                        
                                        indent += group;
                                        offset += 7 * indent;
                                        glBegin(GL_QUADS);
                                                glVertex2f(x+offset, yminc);
                                                glVertex2f(x+offset, ymaxc);
                                                glVertex2f((float)v2d->cur.xmax, ymaxc);
                                                glVertex2f((float)v2d->cur.xmax, yminc);
                                        glEnd();
                                }
                                
                                /* draw expand/collapse triangle */
                                if (expand > 0) {
                                        UI_icon_draw(x+offset, ydatac, expand);
                                        offset += 17;
                                }
                                
                                /* draw special icon indicating certain data-types */
                                if (special > -1) {
                                        /* for normal channels */
                                        UI_icon_draw(x+offset, ydatac, special);
                                        offset += 17;
                                }
                                glDisable(GL_BLEND);
                                
                                /* draw name */
                                if (sel)
                                        UI_ThemeColor(TH_TEXT_HI);
                                else
                                        UI_ThemeColor(TH_TEXT);
                                offset += 3;
                                UI_DrawString(x+offset, y-4, name);
                                
                                /* reset offset - for RHS of panel */
                                offset = 0;
                                
                                /* set blending again, as text drawing may clear it */
                                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                                glEnable(GL_BLEND);
                                
                                /* draw protect 'lock' */
                                if (protect > -1) {
                                        offset = 16;
                                        UI_icon_draw((float)(v2d->cur.xmax-offset), ydatac, protect);
                                }
                                
                                /* draw mute 'eye' */
                                if (mute > -1) {
                                        offset += 16;
                                        UI_icon_draw((float)(v2d->cur.xmax-offset), ydatac, mute);
                                }
                                
                                /* draw NLA-action line 'status-icons' - only when there's an action */
                                if ((ale->type == ANIMTYPE_NLAACTION) && (ale->data)) {
                                        AnimData *adt= ale->adt;
                                        
                                        offset += 16;
                                        
                                        /* now draw some indicator icons  */
                                        if ((adt) && (adt->flag & ADT_NLA_EDIT_ON)) {
                                                /* toggle for tweaking with mapping/no-mapping (i.e. 'in place editing' toggle) */
                                                // for now, use pin icon to symbolise this
                                                if (adt->flag & ADT_NLA_EDIT_NOMAP)
                                                        UI_icon_draw((float)(v2d->cur.xmax-offset), ydatac, ICON_PINNED);
                                                else
                                                        UI_icon_draw((float)(v2d->cur.xmax-offset), ydatac, ICON_UNPINNED);
                                                
                                                fdrawline((float)(v2d->cur.xmax-offset), yminc, 
                                                                  (float)(v2d->cur.xmax-offset), ymaxc);
                                                offset += 16;
                                                
                                                /* 'tweaking action' indicator - not a button */
                                                UI_icon_draw((float)(v2d->cur.xmax-offset), ydatac, ICON_EDIT); 
                                        }
                                        else {
                                                /* XXX firstly draw a little rect to help identify that it's different from the toggles */
                                                glBegin(GL_LINE_LOOP);
                                                        glVertex2f((float)v2d->cur.xmax-offset-1, y-7);
                                                        glVertex2f((float)v2d->cur.xmax-offset-1, y+9);
                                                        glVertex2f((float)v2d->cur.xmax-1, y+9);
                                                        glVertex2f((float)v2d->cur.xmax-1, y-7);
                                                glEnd(); // GL_LINES
                                                
                                                /* 'push down' icon for normal active-actions */
                                                UI_icon_draw((float)v2d->cur.xmax-offset, ydatac, ICON_FREEZE);
                                        }
                                }
                                
                                glDisable(GL_BLEND);
                        }
                }
                
                /* adjust y-position for next one */
                y -= NLACHANNEL_STEP;
        }
}

void draw_nla_channel_list (bContext *C, bAnimContext *ac, ARegion *ar)
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        View2D *v2d= &ar->v2d;
        float y= 0.0f;
        int items, height;
        
        /* build list of channels to draw */
        filter= (ANIMFILTER_VISIBLE|ANIMFILTER_CHANNELS);
        items= ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* Update max-extent of channels here (taking into account scrollers):
         *      - this is done to allow the channel list to be scrollable, but must be done here
         *        to avoid regenerating the list again and/or also because channels list is drawn first
         *      - offset of NLACHANNEL_HEIGHT*2 is added to the height of the channels, as first is for 
         *        start of list offset, and the second is as a correction for the scrollers.
         */
        height= ((items*NLACHANNEL_STEP) + (NLACHANNEL_HEIGHT*2));
        /* don't use totrect set, as the width stays the same 
         * (NOTE: this is ok here, the configuration is pretty straightforward) 
         */
        v2d->tot.ymin= (float)(-height);
        /* need to do a view-sync here, so that the keys area doesn't jump around (it must copy this) */
        UI_view2d_sync(NULL, ac->sa, v2d, V2D_LOCK_COPY);
        
        /* draw channels */
        {       /* first pass: backdrops + oldstyle drawing */
                y= (float)(-NLACHANNEL_HEIGHT);
                
                draw_nla_channel_list_gl(ac, &anim_data, v2d, y);
        }
        {       /* second pass: UI widgets */
                uiBlock *block= uiBeginBlock(C, ar, "NLA channel buttons", UI_EMBOSS);
                
                y= (float)(-NLACHANNEL_HEIGHT);
                
                /* set blending again, as may not be set in previous step */
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
                glEnable(GL_BLEND);
                
                /* loop through channels, and set up drawing depending on their type  */        
                for (ale= anim_data.first; ale; ale= ale->next) {
                        const float yminc= (float)(y - NLACHANNEL_HEIGHT_HALF);
                        const float ymaxc= (float)(y + NLACHANNEL_HEIGHT_HALF);
                        
                        /* check if visible */
                        if ( IN_RANGE(yminc, v2d->cur.ymin, v2d->cur.ymax) ||
                                 IN_RANGE(ymaxc, v2d->cur.ymin, v2d->cur.ymax) ) 
                        {
                                /* draw all channels using standard channel-drawing API */
                                ANIM_channel_draw_widgets(ac, ale, block, yminc, ymaxc);
                        }
                        
                        /* adjust y-position for next one */
                        y -= NLACHANNEL_STEP;
                }
                
                uiEndBlock(C, block);
                uiDrawBlock(C, block);
                
                glDisable(GL_BLEND);
        }
        
        /* free tempolary channels */
        BLI_freelistN(&anim_data);
}

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