Fix T78452 EEVEE: Motion Blur: Crash when using camera switching

This was caused by the ViewLayer being freed with all its
engine data.

2 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index 7a889d9399e..16e6269aad6 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -632,6 +632,10 @@ void DRW_render_object_iter(void *vedata,
                                              struct RenderEngine *engine,
                                              struct Depsgraph *depsgraph));
 void DRW_render_instance_buffer_finish(void);
+void DRW_render_set_time(struct RenderEngine *engine,
+                         struct Depsgraph *depsgraph,
+                         int frame,
+                         float subframe);
 void DRW_render_viewport_size_set(const int size[2]);
 
 void DRW_custom_pipeline(DrawEngineType *draw_engine_type,
diff --git a/source/blender/draw/intern/draw_manager.c b/source/blender/draw/intern/draw_manager.c
index 43025d9fef4..2beab021cfb 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -1953,6 +1953,14 @@ void DRW_render_instance_buffer_finish(void)
   drw_resource_buffer_finish(DST.vmempool);
 }
 
+/* WARNING: Changing frame might free the ViewLayerEngineData */
+void DRW_render_set_time(RenderEngine *engine, Depsgraph *depsgraph, int frame, float subframe)
+{
+  RE_engine_frame_set(engine, frame, subframe);
+  DST.draw_ctx.scene = DEG_get_evaluated_scene(depsgraph);
+  DST.draw_ctx.view_layer = DEG_get_evaluated_view_layer(depsgraph);
+}
+
 /**
  * object mode select-loop, see: ED_view3d_draw_select_loop (legacy drawing).
  */