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c++openglglslopengl-3opengl-4

Referring to uniforms without glGetUniformLocation

in my shaders I like to use a syntax like this:

layout (location = 0) in vec3 aPos;

So that I can just use the index 0 in glVertexAttribPointer and the such, saving the effort for the glGetAttribLocation call. I'd like to do the same with uniform values, but if I do 

layout (location = 2) uniform float offset;

My vertex shader fails to compile. Is there any way to achieve the same behavior and not use glGetUniformLocation?

Solution

  • OpenGL 4.3 or the ARB_explicit_uniform_location extension allows you to specify uniform locations within the shader using that syntax. So your shader #version needs to be 430 or you need to activate the extension in your shader to be able to use this syntax.