Please pass texture resolutions to shaders

[mal]

The textureSize function was only added in GLSL 1.30 and GLES 3.0 so at present it's not possible to create or use shaders that rely upon or make use of texture aspect ratios or pixel calculations as there's no good way to pass texture dimensions to a shader program.

Would it be possible to add this information as standard under a predictable name? I'd suggest something like resN to mirror texN, such that uniform vec2 res0 would hold the pixel dimensions of tex0 and so on for the available textures. The data (at least for tex0) is already available to the Transform at the time shader uniforms are being set, so this seems like it could be a quick and simple win.

Would be happy to PR a basic version of this. 🙂

[renpytom]

I think that makes sense to do, so if you want to PR it, I'll accept it.

[renpytom]

a8e2cc0 fixes this. I didn't think your PR was correct - you're using the resolution of the Model, which is in virtual pixels, rather than the resolution of the actual texture, which is in drawable-space pixels. I also made this change as the uniform is loaded, provided that it's loaded from a GLTexture (which it should be everywhere except for the texture loader.)

[mal]

Aha! Thanks, taking a look implementing the correct solution, this addition looks to be working great in the a8e2cc0 nightly! 🎉