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So for attributes the spacing between indexes is vec4, so if I had 2 matrix as an attribute, they'd be layout (location = 0) in mat4 a and layout (location = 4) in mat4 b

If I did the same for 2 uniform matix, what would the index of matrix b be?

Side note: with OpenGL 4, are VBOs also attributes, there isn't a key word for vertex?

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Uniform locations don't work like attribute locations.

Every basic type in OpenGL takes up 1 uniform location. So a float and a mat4 both take up 1 location. The only time multiple locations are consumed is if you're using an aggregate (aka: struct or array) of basic types. Each basic type element of the aggregate, recursively, takes up one location.

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