Commit: 505309f659d349c95c16297d5e6785f83764c740
Author: Clément Foucault
Date: Sat Dec 1 20:15:23 2018 +0100
Branches: blender2.8
https://developer.blender.org/rB505309f659d349c95c16297d5e6785f83764c740
WM: Optimization: Don't clear the window color buffer
This is not needed and is rather costly.
Can be reverted if that causes problem.
===================================================================
M source/blender/windowmanager/intern/wm_draw.c
===================================================================
diff --git a/source/blender/windowmanager/intern/wm_draw.c
b/source/blender/windowmanager/intern/wm_draw.c
index 00364489af7..d6058ac0d28 100644
--- a/source/blender/windowmanager/intern/wm_draw.c
+++ b/source/blender/windowmanager/intern/wm_draw.c
@@ -622,8 +622,14 @@ static void wm_draw_window_onscreen(bContext *C, wmWindow
*win, int view)
/* Draw into the window framebuffer, in full window coordinates. */
wmWindowViewport(win);
+
+ /* We draw on all pixels of the windows so we don't need to clear them
before.
+ * Actually this is only a problem when resizing the window.
+ * If it becomes a problem we should clear only when window size
changes. */
+#if 0
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
+#endif
/* Blit non-overlapping area regions. */
ED_screen_areas_iter(win, screen, sa) {
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