Custom function for Unity shader graph to perform image processing convolutions

Convolution3x3.hlsl

static float2 kernel3UVs[9] = {
    float2(-1, 1), float2(0, 1), float2(1, 1),
    float2(-1, 0), float2(0, 0), float2(1, 0),
    float2(-1, -1), float2(0, -1), float2(1, -1),
};
void DoubleKernel3x3_float(Texture2D Texture, SamplerState Sampler, float TexelWidth, float TexelHeight, float2 UV,
                           float3x3 KernelX, float3x3 KernelY, float Thickness, out float Out)
{
    const float2 texelSize = float2(TexelWidth, TexelHeight);
    const float2 offset = Thickness / texelSize;
    float3 samples[9];

    [unroll] for (int i = 0; i < 9; i++)
    {
        samples[i] = SAMPLE_TEXTURE2D_X(Texture, Sampler,
                                        UnityStereoTransformScreenSpaceTex(UV + kernel3UVs[i] * offset));
    }

    float3 horizontal = 0;
    float3 vertical = 0;
    [unroll] for (int x = 0; x < 3; x++)
    {
        [unroll] for (int y = 0; y < 3; y++)
        {
            horizontal += samples[x * 3 + y] * KernelX[x][y];
            vertical += samples[x * 3 + y] * KernelY[x][y];
        }
    }

    Out = sqrt(dot(horizontal, horizontal) + dot(vertical, vertical));
}

Example.md