120fe74ffe
Doing linearization with GLSL was already faster, but even faster is to just read the bytes instead of floats and convert those to linear, since byte => float is just a quick 256 entry table lookup. Also made it assign the bytes directly to the image buffer so they do not need to be converted back from float to byte for file saving, and made sky render write the background color with OpenGL instead of doing it on the CPU.