pex-renderer/shaders/chunks/depth-pack.glsl.js

Physically Based Renderer for Pex

module.exports = /* glsl */ `
//from http://spidergl.org/example.php?id=6
vec4 packDepth(const in float depth) {
  const vec4 bit_shift = vec4(256.0*256.0*256.0, 256.0*256.0, 256.0, 1.0);
  const vec4 bit_mask  = vec4(0.0, 1.0/256.0, 1.0/256.0, 1.0/256.0);
  vec4 res = fract(depth * bit_shift);
  res -= res.xxyz * bit_mask;
  return res;
}
`