Limit the supported texture types for GLSL

[jkwak-work]

GLSL supports only four types for textures: vec4, ivec4, uvec4, and float. The generic parameterization for the vector element count is not needed for the GLSL texture functions.

In other words, N is removed from __generic and it is replaced with 4.

[csyonghe]

I understand the change is to make the definitions more conformant to glsl, but does it have any downside to allow more texture types?

[ArielG-NV]

I tested the question.

It seems this change is not be required if we prefer functionality over conformance to GLSL as described.

example of functionally working:

#version 450 core
#extension GL_EXT_texture_shadow_lod : enable

RWStructuredBuffer<float> outputBuffer;
uniform Sampler1D<vector<float,3>> uniform_sampler1D;

[numthreads(4, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
    outputBuffer[0] = textureLod(uniform_sampler1D, 0, 0).z;
}

[jkwak-work]

Thanks for the comments and also for the testing. Honestly I didn't think more than thinking about the GLSL conformance. And it appears that my understanding was incorrect based on my testing that is similar to what Ariel did. I am abandoning this change.