217 lines
9.1 KiB
Plaintext
217 lines
9.1 KiB
Plaintext
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Shader "Hidden/Universal Render Pipeline/Bloom"
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{
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HLSLINCLUDE
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#pragma exclude_renderers gles
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#pragma multi_compile_local _ _USE_RGBM
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#pragma multi_compile _ _USE_DRAW_PROCEDURAL
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Filtering.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/Shaders/PostProcessing/Common.hlsl"
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TEXTURE2D_X(_SourceTex);
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float4 _SourceTex_TexelSize;
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TEXTURE2D_X(_SourceTexLowMip);
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float4 _SourceTexLowMip_TexelSize;
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float4 _Params; // x: scatter, y: clamp, z: threshold (linear), w: threshold knee
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#define Scatter _Params.x
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#define ClampMax _Params.y
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#define Threshold _Params.z
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#define ThresholdKnee _Params.w
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half4 EncodeHDR(half3 color)
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{
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#if _USE_RGBM
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half4 outColor = EncodeRGBM(color);
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#else
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half4 outColor = half4(color, 1.0);
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#endif
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#if UNITY_COLORSPACE_GAMMA
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return half4(sqrt(outColor.xyz), outColor.w); // linear to γ
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#else
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return outColor;
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#endif
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}
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half3 DecodeHDR(half4 color)
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{
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#if UNITY_COLORSPACE_GAMMA
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color.xyz *= color.xyz; // γ to linear
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#endif
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#if _USE_RGBM
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return DecodeRGBM(color);
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#else
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return color.xyz;
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#endif
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}
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half4 FragPrefilter(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float2 uv = UnityStereoTransformScreenSpaceTex(input.uv);
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#if _BLOOM_HQ
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float texelSize = _SourceTex_TexelSize.x;
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half4 A = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(-1.0, -1.0));
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half4 B = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(0.0, -1.0));
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half4 C = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(1.0, -1.0));
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half4 D = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(-0.5, -0.5));
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half4 E = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(0.5, -0.5));
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half4 F = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(-1.0, 0.0));
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half4 G = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv);
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half4 H = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(1.0, 0.0));
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half4 I = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(-0.5, 0.5));
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half4 J = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(0.5, 0.5));
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half4 K = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(-1.0, 1.0));
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half4 L = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(0.0, 1.0));
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half4 M = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + texelSize * float2(1.0, 1.0));
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half2 div = (1.0 / 4.0) * half2(0.5, 0.125);
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half4 o = (D + E + I + J) * div.x;
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o += (A + B + G + F) * div.y;
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o += (B + C + H + G) * div.y;
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o += (F + G + L + K) * div.y;
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o += (G + H + M + L) * div.y;
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half3 color = o.xyz;
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#else
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half3 color = SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv).xyz;
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#endif
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// User controlled clamp to limit crazy high broken spec
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color = min(ClampMax, color);
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// Thresholding
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half brightness = Max3(color.r, color.g, color.b);
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half softness = clamp(brightness - Threshold + ThresholdKnee, 0.0, 2.0 * ThresholdKnee);
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softness = (softness * softness) / (4.0 * ThresholdKnee + 1e-4);
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half multiplier = max(brightness - Threshold, softness) / max(brightness, 1e-4);
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color *= multiplier;
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// Clamp colors to positive once in prefilter. Encode can have a sqrt, and sqrt(-x) == NaN. Up/Downsample passes would then spread the NaN.
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color = max(color, 0);
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return EncodeHDR(color);
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}
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half4 FragBlurH(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float texelSize = _SourceTex_TexelSize.x * 2.0;
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float2 uv = UnityStereoTransformScreenSpaceTex(input.uv);
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// 9-tap gaussian blur on the downsampled source
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half3 c0 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(texelSize * 4.0, 0.0)));
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half3 c1 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(texelSize * 3.0, 0.0)));
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half3 c2 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(texelSize * 2.0, 0.0)));
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half3 c3 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(texelSize * 1.0, 0.0)));
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half3 c4 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv ));
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half3 c5 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(texelSize * 1.0, 0.0)));
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half3 c6 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(texelSize * 2.0, 0.0)));
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half3 c7 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(texelSize * 3.0, 0.0)));
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half3 c8 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(texelSize * 4.0, 0.0)));
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half3 color = c0 * 0.01621622 + c1 * 0.05405405 + c2 * 0.12162162 + c3 * 0.19459459
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+ c4 * 0.22702703
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+ c5 * 0.19459459 + c6 * 0.12162162 + c7 * 0.05405405 + c8 * 0.01621622;
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return EncodeHDR(color);
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}
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half4 FragBlurV(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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float texelSize = _SourceTex_TexelSize.y;
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float2 uv = UnityStereoTransformScreenSpaceTex(input.uv);
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// Optimized bilinear 5-tap gaussian on the same-sized source (9-tap equivalent)
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half3 c0 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(0.0, texelSize * 3.23076923)));
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half3 c1 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv - float2(0.0, texelSize * 1.38461538)));
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half3 c2 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv ));
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half3 c3 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(0.0, texelSize * 1.38461538)));
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half3 c4 = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv + float2(0.0, texelSize * 3.23076923)));
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half3 color = c0 * 0.07027027 + c1 * 0.31621622
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+ c2 * 0.22702703
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+ c3 * 0.31621622 + c4 * 0.07027027;
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return EncodeHDR(color);
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}
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half3 Upsample(float2 uv)
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{
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half3 highMip = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTex, sampler_LinearClamp, uv));
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#if _BLOOM_HQ && !defined(SHADER_API_GLES)
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half3 lowMip = DecodeHDR(SampleTexture2DBicubic(TEXTURE2D_X_ARGS(_SourceTexLowMip, sampler_LinearClamp), uv, _SourceTexLowMip_TexelSize.zwxy, (1.0).xx, unity_StereoEyeIndex));
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#else
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half3 lowMip = DecodeHDR(SAMPLE_TEXTURE2D_X(_SourceTexLowMip, sampler_LinearClamp, uv));
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#endif
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return lerp(highMip, lowMip, Scatter);
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}
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half4 FragUpsample(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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half3 color = Upsample(UnityStereoTransformScreenSpaceTex(input.uv));
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return EncodeHDR(color);
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}
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ENDHLSL
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SubShader
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{
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Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline"}
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LOD 100
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ZTest Always ZWrite Off Cull Off
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Pass
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{
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Name "Bloom Prefilter"
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HLSLPROGRAM
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#pragma vertex FullscreenVert
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#pragma fragment FragPrefilter
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#pragma multi_compile_local _ _BLOOM_HQ
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ENDHLSL
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}
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Pass
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{
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Name "Bloom Blur Horizontal"
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HLSLPROGRAM
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#pragma vertex FullscreenVert
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#pragma fragment FragBlurH
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ENDHLSL
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}
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Pass
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{
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Name "Bloom Blur Vertical"
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HLSLPROGRAM
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#pragma vertex FullscreenVert
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#pragma fragment FragBlurV
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ENDHLSL
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}
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Pass
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{
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Name "Bloom Upsample"
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HLSLPROGRAM
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#pragma vertex FullscreenVert
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#pragma fragment FragUpsample
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#pragma multi_compile_local _ _BLOOM_HQ
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ENDHLSL
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}
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}
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}
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