[Mesa-dev] GLSL swizzle lowering

[Ian Romanick]

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Luca Barbieri wrote:
> nv30 and nv40 support SEQ everywhere, and Marek's SEQ/DP4 seems optimal.
> 
> BTW, the nVidia Cg compiler (which can tell us what nVidia does)
> doesn't seem to accept my naive attempts to index a vector in GLSL: is
> something special needed to do it? (some version directive, or special
> syntax?)

Nope.  The following shader is valid in all versions of GLSL and should
generate an index into the vector.  What does the Cg compiler generate
for that?

uniform int i;
uniform vec4 c;

void main()
{
	gl_FragColor = vec4(c[i]);
}
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