Fix samplers in texture-integer
According to GLSL 1.30 spec, samplers must be of the same type as the internal format of the texture.
Thus, a signed sampler can't be used to access unsigned format textures.
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According to GLSL 1.30 spec, samplers must be of the same type as the internal format of the texture.
Thus, a signed sampler can't be used to access unsigned format textures.