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How do you pack one 32 bit integers into 4, 8bit ints in GLSL / WebGL?

You can bitshift by multiplying/dividing by powers of two. As pointed out in the comments the approach I originally posted was working but incorrect, here’s one by Aras Pranckevičius, note that the source code in the post itself contains a typo and is HLSL, this is a GLSL port with the typo corrected: const vec4 … Read more

In a fragment shader, why can’t I use a flat input integer to index a uniform array of sampler2D?

[…] but can’t use it to index an array of samplers as expected because compiler sees it as “non-constant” […] In GLSL up to version 3.30 respectively GLSL ES up to version 3.00, the index of an array of texture samplers has to be a constant expression: GLSL 3.30 Specification – 4.1.7 Samplers (page 21) … Read more