Maybe somebody on this list can save me from reinventing the wheel...
I'm looking to get a better understanding of performance issues related to
uniforms.
How much overhead is there in having a uniform? If there only a performance
hit if the uniform changes values or every frame. What if I change the Uniform
in OSG to exactly the same value it already has, would there be a performance
hit?
I have uniforms that might not change values very often. Some are simply
boolean flags. Can I have different shaders and somehow switch between them?
Can I "recompile" the shader on-the-fly (i.e. defining these boolean using
#define/#if-#endif)?
In some cases, I have variables which can change within the shader, but I know
these values when I create the scene graph so I currently use #define instead
of passing them as uniforms (which will ever only have one value). Does this
gain me much in performance?
Also, is there a difference in performance in using four "float" uniforms
versus setting a Vec4?
Paul P.
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