Sculpt: Improve sculpt debug draw

* Fixed crash in debug draw code.  Apparently this is
  only used by PBVH draw?
* Debug draw code can now be forcibly enabled in release
  mode (i.e. RelWithDebugInfo) by uncommenting a commented
  out #define.
* Fixed colors in debug draw mode.
* PBVH node boxes in debug mode now flash a different color
  when they are updated.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/pbvh_intern.h b/source/blender/blenkernel/intern/pbvh_intern.h
index 5babfd3acbe..3d67ab9ba6b 100644
--- a/source/blender/blenkernel/intern/pbvh_intern.h
+++ b/source/blender/blenkernel/intern/pbvh_intern.h
@@ -123,6 +123,11 @@ struct PBVHNode {
   /* Used to store the brush color during a stroke and composite it over the original color */
   PBVHColorBufferNode color_buffer;
   PBVHPixelsNode pixels;
+
+  /* Used to flash colors of updated node bounding boxes in
+   * debug draw mode (when G.debug_value / bpy.app.debug_value is 889).
+   */
+  int debug_draw_gen;
 };
 
 typedef enum { PBVH_DYNTOPO_SMOOTH_SHADING = 1 } PBVHFlags;