2.5: WM Compositing

* Triple Buffer is now more complete:
  - Proper handling of window resize, duplicate, etc.
  - It now uses 3x3 textures (or less) if the power of two sizes
    do not match well. That still has a worst case wast of 23.4%,
    but better than 300%.
  - It can also use the ARB/NV/EXT_texture_rectangle extension
    now, which may be supported on hardware that does not support
    ARB_texture_non_power_of_two.
  - Gesture, menu and brushe redraws now require no redraws at all
    from the area regions. So even on a high poly scene just moving
    the paint cursor or opening a menu should be fast.

* Testing can be done by setting the "Window Draw Method" in the
  User Preferences in the outliner. "Overlap" is still default,
  since "Triple Buffer" has not been tested on computers other than
  mine, would like to avoid crashing Blender on startup in case
  there is a common bug, but it's ready for testing now.

  - For reference "Full" draws the full window each time.
  - "Triple Buffer" should work for both swap copy and swap exchange
    systems, the latter still need the -E command line option for
    "Overlap".
  - Resizing and going fullscreen still gives flicker here but no
    more than "Full" drawing.

* Partial Redraw was added. ED_region_tag_redraw_partial takes a
  rect in window coordinates to define a subarea of the region.
  On region draw it will then set glScissor to a smaller area, and
  ar->drawrct will always be set to either the partial or full
  window rect. The latter can then be used for clipping in the 3D
  view or clipping interface drawing. Neither is implemented yet.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index 64db4a5f191..24f5df4dbcf 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -1513,6 +1513,12 @@ static void rna_def_userdef_system(StructRNA *srna)
 		{2048, "AUDIO_SAMPLES_2048", "2048", "Set audio mixing buffer size to 2048 samples"},
 		{0, NULL, NULL, NULL}};
 
+	static EnumPropertyItem draw_method_items[] = {
+		{USER_DRAW_TRIPLE, "TRIPLE_BUFFER", "Triple Buffer", "Use a third buffer for minimal redraws at the cost of more memory."},
+		{USER_DRAW_OVERLAP, "OVERLAP", "Overlap", "Redraw all overlapping regions, minimal memory usage but more redraws."},
+		{USER_DRAW_FULL, "FULL", "Full", "Do a full redraw each time, slow, only use for reference or when all else fails."},
+		{0, NULL, NULL, NULL}};
+
 	/* System & OpenGL */
 
 	prop= RNA_def_property(srna, "solid_lights", PROP_COLLECTION, PROP_NONE);
@@ -1592,6 +1598,11 @@ static void rna_def_userdef_system(StructRNA *srna)
 	RNA_def_property_range(prop, 1, 3600);
 	RNA_def_property_ui_text(prop, "Texture Collection Rate", "Number of seconds between each run of the GL texture garbage collector.");
 
+	prop= RNA_def_property(srna, "window_draw_method", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "wmdrawmethod");
+	RNA_def_property_enum_items(prop, draw_method_items);
+	RNA_def_property_ui_text(prop, "Window Draw Method", "Drawing method used by the window manager.");
+
 	prop= RNA_def_property(srna, "audio_mixing_buffer", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "mixbufsize");
 	RNA_def_property_enum_items(prop, audio_mixing_samples_items);