http://www.reedbeta.com/blog/2013/01/12/quick-and-easy-gpu-random-numbers-in-d3d11/
https://github.com/openglsuperbible/sb6code/blob/master/bin/media/shaders/ssao/ssao.fs.glsl http://math.stackexchange.com/questions/337782/pseudo-random-number-generation-on-the-gpu
http://www.trentreed.net/blog/screen-space-ambient-occlusion/
http://www.ozone3d.net/blogs/lab/20110427/glsl-random-generator/ http://stackoverflow.com/questions/12964279/whats-the-origin-of-this-glsl-rand-one-liner http://stackoverflow.com/questions/4200224/random-noise-functions-for-glsl https://gist.github.com/keijiro/ee7bc388272548396870 http://stackoverflow.com/questions/5149544/can-i-generate-a-random-number-inside-a-pixel-shader http://gamedev.stackexchange.com/questions/32681/random-number-hlsl
"Pseudorandom Number Generation on the GPU" http://www.graphicshardware.org/previous/www_2006/presentations/sussman-PseudorandomNumberGenerationOnTheGPU-gh06.pdf "Efficient Random Number Generation and Application Using CUDA" GPU Gems 3 http://http.developer.nvidia.com/GPUGems3/gpugems3_ch37.html
https://github.com/ashima/webgl-noise
http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter26.html
GPU Gems 3 chapter 37 seems to have moved here, and GPU Gems 2 chapter 26 here.