36 lines
975 B
Plaintext
36 lines
975 B
Plaintext
float4 shadeVideo(ShaderContext context)
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{
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float2 texel = 1.0 / max(context.inputResolution, float2(1.0, 1.0));
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float blurRadius = max(radius, 0.0);
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float2 sampleStep = texel * blurRadius;
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int sampleRadius = int(clamp(samples, 0.0, 8.0) + 0.5);
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float4 center = sampleVideo(context.uv);
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float4 blur = float4(0.0, 0.0, 0.0, 0.0);
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float totalWeight = 0.0;
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for (int y = -sampleRadius; y <= sampleRadius; ++y)
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{
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for (int x = -sampleRadius; x <= sampleRadius; ++x)
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{
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float distanceSquared = float(x * x + y * y);
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float sigma = max(float(sampleRadius) * 0.5, 0.5);
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float weight = exp(-distanceSquared / (2.0 * sigma * sigma));
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float2 offset = float2(float(x), float(y)) * sampleStep;
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blur += sampleVideo(context.uv + offset) * weight;
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totalWeight += weight;
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}
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}
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if (sampleRadius == 0)
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{
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blur = center;
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totalWeight = 1.0;
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}
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blur /= max(totalWeight, 0.0001);
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float mixValue = saturate(strength);
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return lerp(center, blur, mixValue);
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}
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