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Accessing texture in vertex shader

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In GLSL, on a card with PS2.0 support only (x800xt). Is it possible to access a texture value from a vertex shader? (as opposed to a fragment shader). (Under GLSL in particular). I get linking errors when I attempt this. I guess usually you don't need texture values in the vertex shader. I was just hoping I use a texture as a lookup table to store some values :-/

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