One liner pseudo random generator with HLSL

prng.cginc

float nrand(float2 uv)
{
    return frac(sin(dot(uv, float2(12.9898, 78.233))) * 43758.5453);
}

ChatGPT found and used this exact snippet whilst I was asking it to convert some code to HLSL and needed a random generator.

@mikec316 well for how simple this code is (now that I have the years of experience) I am surprised GPT did not just write it out instead of finding a link? Did you ask for it to find it online specifically?

@mikec316 well for how simple this code is (now that I have the years of experience) I am surprised GPT did not just write it out instead of finding a link? Did you ask for it to find it online specifically?

ChatGPT wrote it out exactly as it appears above, no link. I just managed to find the link while verifying :D

@mikec316 ah ok yeah that is because its a well known function from long before @keijiro wrote it. Its a simple concept really, but for a more effective aproach make sure that if you are using the noise within a texture or some finite space that you divide the uv by a float2(width, height). Or multiply it, i forget. Its to make SURE there is no repeating pattern