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samplerRECT & texRECT in GLSL ?

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Yes. From the ARB_texture_rectangle specs:

Quote:

Additions to the OpenGL Shading Language specification

Add the following keywords:

samplerRect
samplerRectShadow

Add to section 8.7 "Texture Lookup Functions"

vec4 textureRect(samplerRect sampler, float coord)
vec4 textureRectProj(samplerRect sampler, float coord)

No "bias" parameter is allowed because mipmaps are not allowed for
texture rectangles.

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