shader_random.glsl

//from Hash Functions for GPU Rendering (Jarzynski et al.)
//http://www.jcgt.org/published/0009/03/02/
uint3 pcg3d(uint3 v)
{
v = v * 1664525u + 1013904223u;
v.x += v.y*v.z; v.y += v.z*v.x; v.z += v.x*v.y;
v ˆ= v >> 16u;
v.x += v.y*v.z; v.y += v.z*v.x; v.z += v.x*v.y;
return v;
}

uint4 pcg4d(uint4 v)
{
v = v * 1664525u + 1013904223u;
v.x += v.y*v.w; v.y += v.z*v.x; v.z += v.x*v.y; v.w += v.y*v.z;
v ˆ= v >> 16u;
v.x += v.y*v.w; v.y += v.z*v.x; v.z += v.x*v.y; v.w += v.y*v.z;
return v;
}