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100 行
2.7 KiB
100 行
2.7 KiB
Shader "Hidden/HDRenderPipeline/Sky/SkyHDRI"
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{
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HLSLINCLUDE
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#pragma vertex Vert
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#pragma fragment Frag
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#pragma target 4.5
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#pragma only_renderers d3d11 ps4 xboxone vulkan metal
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#include "ShaderLibrary/Common.hlsl"
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#include "../../../ShaderVariables.hlsl"
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#include "ShaderLibrary/Color.hlsl"
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#include "ShaderLibrary/CommonLighting.hlsl"
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#include "ShaderLibrary/VolumeRendering.hlsl"
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TEXTURECUBE(_Cubemap);
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#ifdef VOLUMETRIC_LIGHTING_ENABLED
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TEXTURE3D(_VBufferLighting);
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#endif
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float4 _SkyParam; // x exposure, y multiplier, z rotation
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float4x4 _PixelCoordToViewDirWS; // Actually just 3x3, but Unity can only set 4x4
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struct Attributes
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{
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uint vertexID : SV_VertexID;
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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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};
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Varyings Vert(Attributes input)
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{
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Varyings output;
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output.positionCS = GetFullScreenTriangleVertexPosition(input.vertexID, UNITY_RAW_FAR_CLIP_VALUE);
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return output;
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}
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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 = normalize(mul(float3(input.positionCS.xy, 1.0), (float3x3)_PixelCoordToViewDirWS));
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// Reverse it to point into the scene
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float3 dir = -viewDirWS;
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// Rotate direction
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float phi = DegToRad(_SkyParam.z);
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float cosPhi, sinPhi;
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sincos(phi, sinPhi, cosPhi);
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float3 rotDirX = float3(cosPhi, 0, -sinPhi);
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float3 rotDirY = float3(sinPhi, 0, cosPhi);
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dir = float3(dot(rotDirX, dir), dir.y, dot(rotDirY, dir));
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float3 skyColor = ClampToFloat16Max(SAMPLE_TEXTURECUBE_LOD(_Cubemap, s_linear_clamp_sampler, dir, 0).rgb * exp2(_SkyParam.x) * _SkyParam.y);
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#ifdef VOLUMETRIC_LIGHTING_ENABLED
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PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
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float4 volumetricLighting = GetInScatteredRadianceAndTransmittance(posInput.positionNDC,
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TEXTURE3D_PARAM(_VBufferLighting, s_linear_clamp_sampler),
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_VBufferResolutionAndScale.zw);
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skyColor *= volumetricLighting.a;
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skyColor += volumetricLighting.rgb;
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#endif
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return float4(skyColor, 1.0);
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}
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ENDHLSL
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SubShader
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{
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Pass
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{
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ZWrite Off
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ZTest Always
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Blend Off
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Cull Off
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HLSLPROGRAM
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ENDHLSL
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}
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Pass
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{
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ZWrite Off
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ZTest LEqual
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Blend Off
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Cull Off
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HLSLPROGRAM
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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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