simple changes to grid drawing logic.

- make ortho grid drawing use vertex arrays
- make perspective view floor drawing cache result of UI_ThemeColorShade so its not called on every line.
- make perspective view floor only loop once on each axis when the grid floor isnt being drawn (was looking over all grid lines for no reason).
- add UI_GetColorPtrShade3ubv() to replace UI_GetColorPtrBlendShade3ubv() when no blending is needed.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_resources.h b/source/blender/editors/include/UI_resources.h
index d383bc0ab78..ab5b8e8aff3 100644
--- a/source/blender/editors/include/UI_resources.h
+++ b/source/blender/editors/include/UI_resources.h
@@ -296,6 +296,9 @@ void	UI_GetThemeColorType4ubv(int colorid, int spacetype, char col[4]);
 // blends and shades between two color pointers
 void	UI_ColorPtrBlendShade3ubv(const unsigned char cp1[3], const unsigned char cp2[3], float fac, int offset);
 
+// shade a 3 byte color (same as UI_GetColorPtrBlendShade3ubv with 0.0 factor)
+void	UI_GetColorPtrShade3ubv(const unsigned char cp1[3], unsigned char col[3], int offset);
+
 // get a 3 byte color, blended and shaded between two other char color pointers
 void	UI_GetColorPtrBlendShade3ubv(const unsigned char cp1[3], const unsigned char cp2[3], unsigned char col[3], float fac, int offset);