source/blender/draw/engines/eevee/shaders/update_noise_frag.glsl


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#pragma BLENDER_REQUIRE(common_math_lib.glsl)

uniform sampler2D blueNoise;
uniform vec3 offsets;

out vec4 FragColor;

void main(void)
{
  vec3 blue_noise = texelFetch(blueNoise, ivec2(gl_FragCoord.xy), 0).xyz;

  float noise = fract(blue_noise.y + offsets.z);
  FragColor.x = fract(blue_noise.x + offsets.x);
  FragColor.y = fract(blue_noise.z + offsets.y);
  FragColor.z = cos(noise * M_2PI);
  FragColor.w = sin(noise * M_2PI);
}