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Reduce the source tree depth a bit.
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This is a more logical place for this code.
Also add some functions for querying vertex shader input names, types, etc.
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This allows code such as "vec4 a = gl_LightSource[i].ambient;" to work.
When a built-in uniform array is indexed with a variable index we need to
"unroll" the whole array into the parameter list (aka constant buffer) because
we don't know which elements may be accessed at compile-time. In the case of
the gl_LightSource array of size [8], we emit 64 state references into the
parameter array (8 elements times 8 vec4s per gl_LightSourceParameters
struct).
Previously, we only allowed constant-indexed references to uniform arrays
(such as gl_LightSource[2].position) which resulted in a single state reference
being added to the parameter array, not 64. We still optimize this case.
Users should be aware that using "gl_LightSource[i].ambient" in their shaders
is a bit expensive since state validation will involve updating all 64
light source entries in the parameter list.
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of -I flags.
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After several tries at making a table-based system for examining pre-defined
uniforms to find statevar indexes, give up and do it the simple way (lots of
strcmp() calls). Not terribly elegant, but perfectly functional.
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