Function to sample a blue noise texture for use with each screen pixel

GetNoiseUV.hlsl

// Requires NDC from GetVertexPositionInputs() in the vert shader
float2 GetNoiseUV(float2 positionNDC) {
    float2 blueTexSizeMultiplier = _BlueNoise_TexelSize.xy; // i.e. 1/32
    float2 screenWidthHeight = _ScreenParams.xy + float2(0.5, 0.5); // i.e. 1920,1080 + half to center
    return screenWidthHeight * blueTexSizeMultiplier * positionNDC;
}