Just a simple productivity enhancement. It would be nice if we could get the size of a sampler directly in GLSL rather than always passing in a uniform. Often times you need these parameters for doing things like texture filtering or handling boundary conditions.
The way I’ve been doing things so far (set 1 uniform per texture) is ugly, brittle and tedious. Every time I need to pass a texture to a shader it seems like I am always passing these values with it, and repeating the same code ad nauseum. A much better way would be to simply add built-in GLSL functions to pull the bounds out of the texture, ie:
uniform sampler2D my_tex;
uniform sampler2D my_other_tex;
ivec2 my_bounds = getBounds2D(my_tex);
ivec2 my_other_bounds = getBounds2D(my_other_tex);
I don’t think that such a feature would be very difficult to implement (though I could be wrong) and it would save an enormous amount of headaches.
