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312 lines
12 KiB
312 lines
12 KiB
Shader "Hidden/HDRP/VolumetricCloudsCombine"
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{
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Properties {}
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SubShader
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{
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HLSLINCLUDE
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#pragma target 4.5
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#pragma only_renderers d3d11 playstation xboxone xboxseries vulkan metal switch
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//#pragma enable_d3d11_debug_symbols
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#pragma vertex Vert
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#pragma fragment Frag
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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/VolumeRendering.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/ShaderVariables.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricClouds/VolumetricCloudsDef.cs.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Sky/SkyUtils.hlsl"
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// Aerial perspective is already applied during cloud tracing
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#define ATMOSPHERE_NO_AERIAL_PERSPECTIVE
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TEXTURE2D_X(_CameraColorTexture);
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TEXTURE2D_X(_VolumetricCloudsLightingTexture);
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TEXTURE2D_X(_VolumetricCloudsDepthTexture);
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TEXTURECUBE(_VolumetricCloudsTexture);
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int _Mipmap;
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struct Attributes
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{
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uint vertexID : SV_VertexID;
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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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UNITY_VERTEX_OUTPUT_STEREO
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};
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Varyings Vert(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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output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID);
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return output;
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}
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ENDHLSL
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Tags{ "RenderPipeline" = "HDRenderPipeline" }
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Pass
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{
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// Pass 0
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Cull Off
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ZTest Less // Required for XR occlusion mesh optimization
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ZWrite Off
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// If this is a background pixel, we want the cloud value, otherwise we do not.
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Blend 0 One OneMinusSrcAlpha, Zero One
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Blend 1 DstColor Zero // Multiply to combine the transmittance
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HLSLPROGRAM
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#pragma multi_compile_fragment _ OUTPUT_TRANSMITTANCE_BUFFER
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/AtmosphericScattering/AtmosphericScattering.hlsl"
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void Frag(Varyings input, out float4 color : SV_Target0
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#if defined(OUTPUT_TRANSMITTANCE_BUFFER)
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, out float2 fogTransmittance : SV_Target3
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#endif
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)
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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// Read cloud data
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color = LOAD_TEXTURE2D_X(_VolumetricCloudsLightingTexture, input.positionCS.xy);
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color.a = 1.0f - color.a;
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float transmittance = 1.0f - color.a;
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float deviceDepth = LOAD_TEXTURE2D_X(_VolumetricCloudsDepthTexture, input.positionCS.xy).x;
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float linearDepth = DecodeInfiniteDepth(deviceDepth, _CloudNearPlane);
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float3 V = GetSkyViewDirWS(input.positionCS.xy);
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float3 positionWS = GetCameraPositionWS() - linearDepth * V;
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// Compute pos inputs
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PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw, positionWS);
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posInput.linearDepth = linearDepth;
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// Apply fog
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float3 volColor, volOpacity;
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EvaluateAtmosphericScattering(posInput, V, volColor, volOpacity);
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color.rgb = color.rgb * (1 - volOpacity) + volColor * color.a;
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// Output transmittance for lens flares
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#if defined(OUTPUT_TRANSMITTANCE_BUFFER)
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// channel 1 is used when fog multiple scattering is enabled and we don't want clouds in this opacity (it doesn't work well with water and transparent sorting)
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fogTransmittance = float2(transmittance, 1);
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#endif
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 1
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Cull Off
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ZWrite Off
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ZTest Always
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Blend Off
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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// Composite the result via hardware blending.
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float4 clouds = LOAD_TEXTURE2D_X(_VolumetricCloudsLightingTexture, input.positionCS.xy);
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clouds.rgb *= GetInverseCurrentExposureMultiplier();
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float4 color = LOAD_TEXTURE2D_X(_CameraColorTexture, input.positionCS.xy);
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return float4(clouds.xyz + color.xyz * clouds.w, 1.0);
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 2
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Cull Off
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ZWrite Off
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ZTest Always
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// If this is a background pixel, we want the cloud value, otherwise we do not.
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Blend One SrcAlpha, Zero One
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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// Composite the result via hardware blending.
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float4 clouds = LOAD_TEXTURE2D_X(_VolumetricCloudsLightingTexture, input.positionCS.xy);
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clouds.rgb *= GetInverseCurrentExposureMultiplier();
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return clouds;
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 3
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Cull Off
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ZWrite Off
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Blend Off
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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return LOAD_TEXTURE2D_X(_VolumetricCloudsLightingTexture, input.positionCS.xy);
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 4
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Cull Off
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ZWrite Off
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Blend Off
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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// Points towards the camera
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float3 viewDirWS = -GetSkyViewDirWS(input.positionCS.xy * (float)_Mipmap);
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// Fetch the clouds
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return SAMPLE_TEXTURECUBE_LOD(_VolumetricCloudsTexture, s_linear_clamp_sampler, viewDirWS, _Mipmap);
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 5
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Cull Off
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ZWrite Off
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Blend Off
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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// Construct the view direction
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float3 viewDirWS = -GetSkyViewDirWS(input.positionCS.xy * (float)_Mipmap);
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// Fetch the clouds
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float4 clouds = SAMPLE_TEXTURECUBE_LOD(_VolumetricCloudsTexture, s_linear_clamp_sampler, viewDirWS, _Mipmap);
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// Inverse the exposure
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clouds.rgb *= GetInverseCurrentExposureMultiplier();
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// Read the color value
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float4 color = LOAD_TEXTURE2D_X(_CameraColorTexture, input.positionCS.xy);
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// Combine the clouds
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return float4(clouds.xyz + color.xyz * clouds.w, 1.0);
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 6
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Cull Off
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ZWrite Off
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// If this is a background pixel, we want the cloud value, otherwise we do not.
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Blend One SrcAlpha, Zero One
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HLSLPROGRAM
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float4 Frag(Varyings input) : SV_Target
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{
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// Construct the view direction
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float3 viewDirWS = -GetSkyViewDirWS(input.positionCS.xy * (float)_Mipmap);
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// Fetch the clouds
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float4 clouds = SAMPLE_TEXTURECUBE_LOD(_VolumetricCloudsTexture, s_linear_clamp_sampler, viewDirWS, _Mipmap);
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// Inverse the exposure
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clouds.rgb *= GetInverseCurrentExposureMultiplier();
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return clouds;
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}
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ENDHLSL
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}
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Pass
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{
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// Pass 7
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// This pass does per pixel sorting with refractive objects
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// Mainly used to correctly sort clouds above water
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Cull Off
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ZTest Less // Required for XR occlusion mesh optimization
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ZWrite Off
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// If this is a background pixel, we want the cloud value, otherwise we do not.
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Blend One OneMinusSrcAlpha, Zero One
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Blend 1 One OneMinusSrcAlpha // before refraction
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Blend 2 One OneMinusSrcAlpha // before refraction alpha
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Blend 3 DstColor Zero // Multiply to combine the transmittance
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HLSLPROGRAM
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#pragma multi_compile_fragment _ OUTPUT_TRANSMITTANCE_BUFFER
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Material/MaterialBlendModeEnum.cs.hlsl"
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#define _BlendMode BLENDINGMODE_ALPHA
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// For refraction sorting, clouds are considered pre-refraction transparents
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#define SUPPORT_WATER_ABSORPTION
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#define _TRANSPARENT_REFRACTIVE_SORT
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Water/Shaders/UnderWaterUtilities.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/AtmosphericScattering/AtmosphericScattering.hlsl"
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#include "Packages/com.unity.render-pipelines.high-definition/Runtime/Lighting/VolumetricClouds/VolumetricCloudsUtilities.hlsl"
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void Frag(Varyings input
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, out float4 color : SV_Target0
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, out float4 outBeforeRefractionColor : SV_Target1
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, out float4 outBeforeRefractionAlpha : SV_Target2
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#if defined(OUTPUT_TRANSMITTANCE_BUFFER)
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, out float2 fogTransmittance : SV_Target3
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#endif
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)
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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// Read cloud data
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color = LOAD_TEXTURE2D_X(_VolumetricCloudsLightingTexture, input.positionCS.xy);
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color.a = 1.0f - color.a;
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float transmittance = 1.0f - color.a;
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float deviceDepth = LOAD_TEXTURE2D_X(_VolumetricCloudsDepthTexture, input.positionCS.xy).x;
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float linearDepth = min(DecodeInfiniteDepth(deviceDepth, _CloudNearPlane), _ProjectionParams.z);
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float3 V = GetSkyViewDirWS(input.positionCS.xy);
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float3 positionWS = GetCameraPositionWS() - linearDepth * V;
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// Compute pos inputs
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PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw, positionWS);
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posInput.linearDepth = linearDepth;
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posInput.deviceDepth = saturate(ConvertCloudDepth(positionWS));
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// Apply fog
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float3 volColor, volOpacity;
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EvaluateAtmosphericScattering(posInput, V, volColor, volOpacity);
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color.rgb = color.rgb * (1 - volOpacity) + volColor * color.a;
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// Sort clouds with refractive objects
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ComputeRefractionSplitColor(posInput, color, outBeforeRefractionColor, outBeforeRefractionAlpha);
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// Output transmittance for lens flares
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#if defined(OUTPUT_TRANSMITTANCE_BUFFER)
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// channel 1 is used when fog multiple scattering is enabled and we don't want clouds in this opacity (it doesn't work well with water and transparent sorting)
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fogTransmittance = float2(transmittance, 1);
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#endif
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}
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ENDHLSL
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}
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}
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Fallback Off
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}
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