112 lines
3.6 KiB
Plaintext
112 lines
3.6 KiB
Plaintext
Shader "Hidden/PostProcessing/Debug/LightMeter"
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{
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HLSLINCLUDE
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#pragma exclude_renderers gles gles3 d3d11_9x
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#pragma target 4.5
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#include "Packages/com.unity.postprocessing/PostProcessing/Shaders/StdLib.hlsl"
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#include "Packages/com.unity.postprocessing/PostProcessing/Shaders/Builtins/ExposureHistogram.hlsl"
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#pragma multi_compile __ COLOR_GRADING_HDR
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#pragma multi_compile __ AUTO_EXPOSURE
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float4 _Params; // x: lowPercent, y: highPercent, z: minBrightness, w: maxBrightness
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float4 _ScaleOffsetRes; // x: scale, y: offset, w: histogram pass width, h: histogram pass height
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TEXTURE3D_SAMPLER3D(_Lut3D, sampler_Lut3D);
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StructuredBuffer<uint> _HistogramBuffer;
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struct VaryingsLightMeter
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{
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float4 vertex : SV_POSITION;
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float2 texcoord : TEXCOORD0;
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float maxValue : TEXCOORD1;
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float avgLuminance : TEXCOORD2;
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};
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VaryingsLightMeter Vert(AttributesDefault v)
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{
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VaryingsLightMeter o;
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o.vertex = float4(v.vertex.xy, 0.0, 1.0);
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o.texcoord = TransformTriangleVertexToUV(v.vertex.xy);
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#if UNITY_UV_STARTS_AT_TOP
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o.texcoord = o.texcoord * float2(1.0, -1.0) + float2(0.0, 1.0);
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#endif
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o.maxValue = 1.0 / FindMaxHistogramValue(_HistogramBuffer);
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o.avgLuminance = GetAverageLuminance(_HistogramBuffer, _Params, o.maxValue, _ScaleOffsetRes.xy);
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return o;
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}
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float4 Frag(VaryingsLightMeter i) : SV_Target
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{
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uint ix = (uint)(round(i.texcoord.x * HISTOGRAM_BINS));
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float bin = saturate(float(_HistogramBuffer[ix]) * i.maxValue);
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float fill = step(i.texcoord.y, bin);
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float4 color = float4(lerp(0.0, 0.75, fill).xxx, 1.0);
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#if AUTO_EXPOSURE
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const float3 kRangeColor = float3(0.05, 0.3, 0.4);
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const float3 kAvgColor = float3(0.75, 0.1, 1.0);
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// Min / max brightness markers
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float luminanceMin = GetHistogramBinFromLuminance(_Params.z, _ScaleOffsetRes.xy);
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float luminanceMax = GetHistogramBinFromLuminance(_Params.w, _ScaleOffsetRes.xy);
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if (i.texcoord.x > luminanceMin && i.texcoord.x < luminanceMax)
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{
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color.rgb = fill.rrr * kRangeColor;
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color.rgb += kRangeColor;
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}
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#endif
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#if COLOR_GRADING_HDR
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// Draw color curves on top
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float4 curves = 0.0;
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float3 lut = SAMPLE_TEXTURE3D(_Lut3D, sampler_Lut3D, i.texcoord.xxx).rgb;
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if (abs(lut.r - i.texcoord.y) < _ScaleOffsetRes.w)
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curves.ra += (1.0).xx;
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if (abs(lut.g - i.texcoord.y) < _ScaleOffsetRes.w)
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curves.ga += (1.0).xx;
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if (abs(lut.b - i.texcoord.y) < _ScaleOffsetRes.w)
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curves.gba += float3(0.5, (1.0).xx);
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color = any(curves) ? curves : color;
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#endif
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#if AUTO_EXPOSURE
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// Current average luminance marker
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float luminanceAvg = GetHistogramBinFromLuminance(i.avgLuminance, _ScaleOffsetRes.xy);
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float avgPx = luminanceAvg * _ScaleOffsetRes.z;
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if (abs(i.texcoord.x - luminanceAvg) < _ScaleOffsetRes.z * 2.0)
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color.rgb = kAvgColor;
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#endif
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return color;
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}
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ENDHLSL
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SubShader
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{
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Cull Off ZWrite Off ZTest Always
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Pass
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{
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HLSLPROGRAM
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#pragma vertex Vert
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#pragma fragment Frag
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ENDHLSL
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}
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}
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}
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