146 lines
4.7 KiB
Plaintext
146 lines
4.7 KiB
Plaintext
Shader "Hidden/Universal Render Pipeline/ScreenSpaceAmbientOcclusion"
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{
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HLSLINCLUDE
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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/EntityLighting.hlsl"
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/ImageBasedLighting.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionHCS : POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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Varyings VertDefault(Attributes input)
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{
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Varyings output;
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
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// Note: The pass is setup with a mesh already in CS
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// Therefore, we can just output vertex position
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output.positionCS = float4(input.positionHCS.xyz, 1.0);
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#if UNITY_UV_STARTS_AT_TOP
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output.positionCS.y *= _ScaleBiasRt.x;
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#endif
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output.uv = input.uv;
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// Add a small epsilon to avoid artifacts when reconstructing the normals
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output.uv += 1.0e-6;
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return output;
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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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Cull Off ZWrite Off ZTest Always
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// ------------------------------------------------------------------
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// Depth only passes
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// ------------------------------------------------------------------
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// 0 - Occlusion estimation with CameraDepthTexture
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Pass
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{
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Name "SSAO_Occlusion"
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ZTest Always
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ZWrite Off
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Cull Off
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HLSLPROGRAM
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#pragma vertex VertDefault
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#pragma fragment SSAO
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#pragma multi_compile_fragment _ _GBUFFER_NORMALS_OCT
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#pragma multi_compile_local _SOURCE_DEPTH _SOURCE_DEPTH_NORMALS
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#pragma multi_compile_local _RECONSTRUCT_NORMAL_LOW _RECONSTRUCT_NORMAL_MEDIUM _RECONSTRUCT_NORMAL_HIGH
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#pragma multi_compile_local _ _ORTHOGRAPHIC
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl"
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ENDHLSL
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}
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// 1 - Horizontal Blur
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Pass
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{
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Name "SSAO_HorizontalBlur"
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HLSLPROGRAM
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#pragma vertex VertDefault
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#pragma fragment HorizontalBlur
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#define BLUR_SAMPLE_CENTER_NORMAL
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#pragma multi_compile_local _ _ORTHOGRAPHIC
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#pragma multi_compile_fragment _ _GBUFFER_NORMALS_OCT
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#pragma multi_compile_local _SOURCE_DEPTH _SOURCE_DEPTH_NORMALS
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl"
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ENDHLSL
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}
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// 2 - Vertical Blur
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Pass
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{
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Name "SSAO_VerticalBlur"
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HLSLPROGRAM
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#pragma vertex VertDefault
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#pragma fragment VerticalBlur
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl"
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ENDHLSL
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}
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// 3 - Final Blur
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Pass
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{
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Name "SSAO_FinalBlur"
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HLSLPROGRAM
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#pragma vertex VertDefault
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#pragma fragment FinalBlur
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/SSAO.hlsl"
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ENDHLSL
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}
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// 4 - After Opaque
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Pass
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{
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Name "SSAO_AfterOpaque"
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ZTest NotEqual
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ZWrite Off
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Cull Off
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Blend One SrcAlpha, Zero One
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BlendOp Add, Add
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HLSLPROGRAM
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#pragma vertex VertDefault
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#pragma fragment FragAfterOpaque
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#define _SCREEN_SPACE_OCCLUSION
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
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half4 FragAfterOpaque(Varyings input) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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AmbientOcclusionFactor aoFactor = GetScreenSpaceAmbientOcclusion(input.uv);
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half occlusion = aoFactor.indirectAmbientOcclusion;
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return half4(0.0, 0.0, 0.0, occlusion);
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}
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ENDHLSL
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}
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}
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}
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