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99 行
3.8 KiB
99 行
3.8 KiB
#ifndef UNITY_HDRENDERPIPELINE_SSAO_NOISEFILTER
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#define UNITY_HDRENDERPIPELINE_SSAO_NOISEFILTER
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half _Downsample;
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TEXTURE2D(_MainTex);
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SAMPLER2D(sampler_MainTex);
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float4 _MainTex_TexelSize;
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half4 FragSeparableFilter(Varyings input) : SV_Target
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{
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// input.positionCS is SV_Position
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PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
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float2 uv = posInput.positionSS;
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#if defined(SSAO_NOISEFILTER_HORIZONTAL)
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// Horizontal pass: Always use 2 texels interval to match to
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// the dither pattern.
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float2 delta = float2(_MainTex_TexelSize.x * 2.0, 0.0);
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#else // SSAO_NOISEFILTER_VERTICAL
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// Vertical pass: Apply _Downsample to match to the dither
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// pattern in the original occlusion buffer.
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float2 delta = float2(0.0, _MainTex_TexelSize.y / _Downsample * 2.0);
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#endif
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// 5-tap Gaussian with linear sampling.
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half4 p0 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv);
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half4 p1a = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - delta * 1.3846153846);
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half4 p1b = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + delta * 1.3846153846);
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half4 p2a = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - delta * 3.2307692308);
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half4 p2b = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + delta * 3.2307692308);
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#if defined(SSAO_NOISEFILTER_CENTERNORMAL)
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half3 n0 = SampleNormal(posInput.unPositionSS);
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#else
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half3 n0 = GetPackedNormal(p0);
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#endif
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// Geometry-aware weighting.
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half w0 = 0.2270270270;
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half w1a = CompareNormal(n0, GetPackedNormal(p1a)) * 0.3162162162;
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half w1b = CompareNormal(n0, GetPackedNormal(p1b)) * 0.3162162162;
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half w2a = CompareNormal(n0, GetPackedNormal(p2a)) * 0.0702702703;
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half w2b = CompareNormal(n0, GetPackedNormal(p2b)) * 0.0702702703;
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half s;
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s = GetPackedAO(p0) * w0;
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s += GetPackedAO(p1a) * w1a;
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s += GetPackedAO(p1b) * w1b;
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s += GetPackedAO(p2a) * w2a;
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s += GetPackedAO(p2b) * w2b;
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s /= w0 + w1a + w1b + w2a + w2b;
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return PackAONormal(s, n0);
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}
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half4 FragFinalFilter(Varyings input) : SV_Target0
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{
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// input.positionCS is SV_Position
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PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
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float2 uv = posInput.positionSS;
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float2 delta = _MainTex_TexelSize.xy / _Downsample; // TODO: is it correct, we have already bilateral upsample here ?
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// 5-tap box blur filter.
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half4 p0 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv);
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half4 p1 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(-delta.x, -delta.y));
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half4 p2 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(+delta.x, -delta.y));
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half4 p3 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(-delta.x, +delta.y));
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half4 p4 = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(+delta.x, +delta.y));
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half3 n0 = GetPackedNormal(p0);
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// Geometry-aware weighting.
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half w0 = 1.0;
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half w1 = CompareNormal(n0, GetPackedNormal(p1));
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half w2 = CompareNormal(n0, GetPackedNormal(p2));
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half w3 = CompareNormal(n0, GetPackedNormal(p3));
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half w4 = CompareNormal(n0, GetPackedNormal(p4));
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half ao;
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ao = GetPackedAO(p0) * w0;
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ao += GetPackedAO(p1) * w1;
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ao += GetPackedAO(p2) * w2;
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ao += GetPackedAO(p3) * w3;
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ao += GetPackedAO(p4) * w4;
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ao /= w0 + w1 + w2 + w3 + w4;
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// Note: When we ImageLoad outside of texture size, the value returned by Load is 0.
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// We use this property to have a neutral value for AO that doesn't consume a sampler and work also with compute shader (i.e use ImageLoad)
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// We store inverse AO so neutral is black. So either we sample inside or outside the texture it return 0 in case of neutral
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return half4(ao, 0, 0, 0); // <= we don't invert ao here but when we sample the texture for reasons explain above
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}
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#endif // UNITY_HDRENDERPIPELINE_SSAO_NOISEFILTER
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