Cycles: optimization for 3D viewport border render with heavy scenes, the OpenGL

render of objects could slow things down when redrawing the view each time a new
sample is displayed.

Now it does a partial redraw of the viewport with only the render border area,
skipping OpenGL object drawing while the render is refining.

2 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index eb364c35091..3dc5ec0ebce 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -64,7 +64,7 @@ void    ED_region_panels(const struct bContext *C, struct ARegion *ar, int verti
 void    ED_region_header_init(struct ARegion *ar);
 void    ED_region_header(const struct bContext *C, struct ARegion *ar);
 void    ED_region_toggle_hidden(struct bContext *C, struct ARegion *ar);
-void    ED_region_info_draw(struct ARegion *ar, const char *text, int block, float alpha);
+void    ED_region_info_draw(struct ARegion *ar, const char *text, int block, float fill_color[4]);
 void    ED_region_grid_draw(struct ARegion *ar, float zoomx, float zoomy);
 float	ED_region_blend_factor(struct ARegion *ar);
 void	ED_region_visible_rect(struct ARegion *ar, struct rcti *rect);
diff --git a/source/blender/editors/include/ED_view3d.h b/source/blender/editors/include/ED_view3d.h
index a1cfc6f91a7..7bb00429eaf 100644
--- a/source/blender/editors/include/ED_view3d.h
+++ b/source/blender/editors/include/ED_view3d.h
@@ -223,6 +223,8 @@ void ED_view3d_calc_camera_border(struct Scene *scene, struct ARegion *ar,
 void ED_view3d_calc_camera_border_size(struct Scene *scene, struct ARegion *ar,
                                        struct View3D *v3d, struct RegionView3D *rv3d,
                                        float r_size[2]);
+bool ED_view3d_calc_render_border(struct Scene *scene, struct View3D *v3d,
+                                  struct ARegion *ar, struct rcti *rect);
 
 void ED_view3d_clipping_calc(struct BoundBox *bb, float planes[4][4], struct bglMats *mats, const struct rcti *rect);
 void ED_view3d_clipping_local(struct RegionView3D *rv3d, float mat[4][4]);