Mesa (master): mesa: check for z=0 in _mesa_Vertex3dv()
Brian Paul
brianp at kemper.freedesktop.org
Tue Jan 5 20:04:16 UTC 2016
Module: Mesa
Branch: master
Commit: f04d7439a0ad6e13ff2912ff824553b6bcf511a4
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=f04d7439a0ad6e13ff2912ff824553b6bcf511a4
Author: Brian Paul <brianp at vmware.com>
Date: Tue Jan 5 13:03:04 2016 -0700
mesa: check for z=0 in _mesa_Vertex3dv()
It's very rare that a GL app calls glVertex3dv(), but one in particular
calls it lot, always with Z = 0. Check for that condition and convert
the call into glVertex2f. This reduces VBO memory used and reduces
the number of times we have to switch between float[2] and float[3]
vertex formats in the svga driver. This results in a small but
measurable performance improvement.
Reviewed-by: Charmaine Lee <charmainel at vmware.com>
---
src/mesa/main/api_loopback.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/mesa/main/api_loopback.c b/src/mesa/main/api_loopback.c
index a7fd82c..8b63d9c 100644
--- a/src/mesa/main/api_loopback.c
+++ b/src/mesa/main/api_loopback.c
@@ -629,7 +629,10 @@ _mesa_Vertex2sv( const GLshort *v )
void GLAPIENTRY
_mesa_Vertex3dv( const GLdouble *v )
{
- VERTEX3( (GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2] );
+ if (v[2] == 0.0)
+ VERTEX2( (GLfloat) v[0], (GLfloat) v[1] );
+ else
+ VERTEX3( (GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2] );
}
void GLAPIENTRY
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