On Thu, 22 Sep 2011 12:41:21 -0700, Kenneth Graunke <kenn...@whitecape.org> wrote: > Very simple shaders don't actually use GLSL built-ins. For example: > - gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; > - gl_FragColor = vec4(0.0); > Both of the shaders used by _mesa_meta_glsl_Clear() also qualify. > > By waiting to initialize the built-ins until the first time we need to > look for a signature, we can avoid the overhead entirely in these cases. > > Makes piglit run roughly 18% faster (255 vs. 312 seconds).
Reviewed-by: Eric Anholt <e...@anholt.net>
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