[Bf-blender-cvs] [4960006] blender-v2.77-release: Fix T47985: VSE GL-render scene strip hangs

[Campbell Barton]

Commit: 4960006b2716d0361ebabf31d9c5820cd9a75eb5
Author: Campbell Barton
Date:   Thu Mar 31 15:35:47 2016 +1100
Branches: blender-v2.77-release
https://developer.blender.org/rB4960006b2716d0361ebabf31d9c5820cd9a75eb5

Fix T47985: VSE GL-render scene strip hangs

Regression in d5f1b9c22,
threading deadlock rendering a scene from the OpenGL preview.

===================================================================

M       source/blender/editors/render/render_opengl.c

===================================================================

diff --git a/source/blender/editors/render/render_opengl.c 
b/source/blender/editors/render/render_opengl.c
index 12fed3f..992b827 100644
--- a/source/blender/editors/render/render_opengl.c
+++ b/source/blender/editors/render/render_opengl.c
@@ -88,8 +88,13 @@ typedef struct OGLRender {
        ScrArea *prevsa;
        ARegion *prevar;
 
+       int views_len;  /* multi-view views */
+
        bool is_sequencer;
        SpaceSeq *sseq;
+       struct {
+               ImBuf **ibufs_arr;
+       } seq_data;
 
 
        Image *ima;
@@ -253,7 +258,6 @@ static void screen_opengl_render_doit(OGLRender *oglrender, 
RenderResult *rr)
        View3D *v3d = oglrender->v3d;
        RegionView3D *rv3d = oglrender->rv3d;
        Object *camera = NULL;
-       ImBuf *ibuf;
        int sizex = oglrender->sizex;
        int sizey = oglrender->sizey;
        const short view_context = (v3d != NULL);
@@ -263,22 +267,11 @@ static void screen_opengl_render_doit(OGLRender 
*oglrender, RenderResult *rr)
        const char *viewname = RE_GetActiveRenderView(oglrender->re);
 
        if (oglrender->is_sequencer) {
-               SeqRenderData context;
                SpaceSeq *sseq = oglrender->sseq;
-               int chanshown = sseq ? sseq->chanshown : 0;
                struct bGPdata *gpd = (sseq && (sseq->flag & SEQ_SHOW_GPENCIL)) 
? sseq->gpd : NULL;
 
-               BKE_sequencer_new_render_data(
-                       oglrender->bmain->eval_ctx, oglrender->bmain, scene,
-                       oglrender->sizex, oglrender->sizey, 100.0f,
-                       &context);
-
-               context.view_id = BKE_scene_multiview_view_id_get(&scene->r, 
viewname);
-               context.gpu_offscreen = oglrender->ofs;
-               context.gpu_fx = oglrender->fx;
-               context.gpu_full_samples = oglrender->ofs_full_samples;
-
-               ibuf = BKE_sequencer_give_ibuf(&context, CFRA, chanshown);
+               /* use pre-calculated ImBuf (avoids deadlock), see: */
+               ImBuf *ibuf = oglrender->seq_data.ibufs_arr[oglrender->view_id];
 
                if (ibuf) {
                        ImBuf *out = IMB_dupImBuf(ibuf);
@@ -429,8 +422,31 @@ static void screen_opengl_render_apply(OGLRender 
*oglrender)
        ImBuf *ibuf;
        void *lock;
 
+       if (oglrender->is_sequencer) {
+               Scene *scene = oglrender->scene;
+
+               SeqRenderData context;
+               SpaceSeq *sseq = oglrender->sseq;
+               int chanshown = sseq ? sseq->chanshown : 0;
+
+               BKE_sequencer_new_render_data(
+                       oglrender->bmain->eval_ctx, oglrender->bmain, scene,
+                       oglrender->sizex, oglrender->sizey, 100.0f,
+                       &context);
+
+               for (view_id = 0; view_id < oglrender->views_len; view_id++) {
+                       context.view_id = view_id;
+                       context.gpu_offscreen = oglrender->ofs;
+                       context.gpu_fx = oglrender->fx;
+                       context.gpu_full_samples = oglrender->ofs_full_samples;
+
+                       oglrender->seq_data.ibufs_arr[view_id] = 
BKE_sequencer_give_ibuf(&context, CFRA, chanshown);
+               }
+       }
+
        rr = RE_AcquireResultRead(oglrender->re);
        for (rv = rr->views.first, view_id = 0; rv; rv = rv->next, view_id++) {
+               BLI_assert(view_id < oglrender->views_len);
                RE_SetActiveRenderView(oglrender->re, rv->name);
                oglrender->view_id = view_id;
                screen_opengl_render_doit(oglrender, rr);
@@ -529,9 +545,13 @@ static bool screen_opengl_render_init(bContext *C, 
wmOperator *op)
 
        oglrender->write_still = is_write_still && !is_animation;
 
+       oglrender->views_len = BKE_scene_multiview_num_views_get(&scene->r);
+
        oglrender->is_sequencer = is_sequencer;
        if (is_sequencer) {
                oglrender->sseq = CTX_wm_space_seq(C);
+               ImBuf **ibufs_arr = MEM_callocN(sizeof(*ibufs_arr) * 
oglrender->views_len, __func__);
+               oglrender->seq_data.ibufs_arr = ibufs_arr;
        }
 
        oglrender->prevsa = prevsa;
@@ -616,6 +636,10 @@ static void screen_opengl_render_end(bContext *C, 
OGLRender *oglrender)
 
        GPU_offscreen_free(oglrender->ofs);
 
+       if (oglrender->is_sequencer) {
+               MEM_freeN(oglrender->seq_data.ibufs_arr);
+       }
+
        oglrender->scene->customdata_mask_modal = 0;
 
        CTX_wm_area_set(C, oglrender->prevsa);

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