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93 行
3.5 KiB
93 行
3.5 KiB
#ifndef LIGHTWEIGHT_SHADOWS_INCLUDED
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#define LIGHTWEIGHT_SHADOWS_INCLUDED
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#define MAX_SHADOW_CASCADES 4
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#if defined(_HARD_SHADOWS) || defined(_SOFT_SHADOWS) || defined(_HARD_SHADOWS_CASCADES) || defined(_SOFT_SHADOWS_CASCADES)
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#define _SHADOWS
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#endif
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#if defined(_HARD_SHADOWS_CASCADES) || defined(_SOFT_SHADOWS_CASCADES)
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#define _SHADOW_CASCADES
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#endif
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#ifdef _SHADOWS
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#define LIGHTWEIGHT_SHADOW_ATTENUATION(posWorld, vertexNormal, shadowDir) ComputeShadowAttenuation(posWorld, vertexNormal, shadowDir)
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#else
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#define LIGHTWEIGHT_SHADOW_ATTENUATION(posWorld, vertexNormal, shadowDir) 1.0h
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#endif
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sampler2D_float _ShadowMap;
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float _PCFKernel[8];
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float4x4 _WorldToShadow[MAX_SHADOW_CASCADES];
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float4 _DirShadowSplitSpheres[MAX_SHADOW_CASCADES];
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half4 _ShadowData;
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half4 _ShadowLightDirection;
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inline half ShadowAttenuation(float3 shadowCoord)
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{
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if (shadowCoord.x <= 0 || shadowCoord.x >= 1 || shadowCoord.y <= 0 || shadowCoord.y >= 1)
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return 1;
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float depth = tex2D(_ShadowMap, shadowCoord).r;
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#if defined(UNITY_REVERSED_Z)
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return step(depth - _ShadowData.y, shadowCoord.z);
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#else
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return step(shadowCoord.z, depth + _ShadowData.y);
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#endif
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}
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inline half ComputeCascadeIndex(float3 wpos)
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{
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float3 fromCenter0 = wpos.xyz - _DirShadowSplitSpheres[0].xyz;
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float3 fromCenter1 = wpos.xyz - _DirShadowSplitSpheres[1].xyz;
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float3 fromCenter2 = wpos.xyz - _DirShadowSplitSpheres[2].xyz;
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float3 fromCenter3 = wpos.xyz - _DirShadowSplitSpheres[3].xyz;
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float4 distances2 = float4(dot(fromCenter0, fromCenter0), dot(fromCenter1, fromCenter1), dot(fromCenter2, fromCenter2), dot(fromCenter3, fromCenter3));
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float4 vDirShadowSplitSphereSqRadii;
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vDirShadowSplitSphereSqRadii.x = _DirShadowSplitSpheres[0].w;
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vDirShadowSplitSphereSqRadii.y = _DirShadowSplitSpheres[1].w;
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vDirShadowSplitSphereSqRadii.z = _DirShadowSplitSpheres[2].w;
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vDirShadowSplitSphereSqRadii.w = _DirShadowSplitSpheres[3].w;
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fixed4 weights = fixed4(distances2 < vDirShadowSplitSphereSqRadii);
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weights.yzw = saturate(weights.yzw - weights.xyz);
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return 4 - dot(weights, fixed4(4, 3, 2, 1));
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}
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inline half ShadowPCF(half3 shadowCoord)
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{
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// TODO: simulate textureGatherOffset not available, simulate it
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half2 offset = half2(0, 0);
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half attenuation = ShadowAttenuation(half3(shadowCoord.xy + half2(_PCFKernel[0], _PCFKernel[1]) + offset, shadowCoord.z)) +
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ShadowAttenuation(half3(shadowCoord.xy + half2(_PCFKernel[2], _PCFKernel[3]) + offset, shadowCoord.z)) +
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ShadowAttenuation(half3(shadowCoord.xy + half2(_PCFKernel[4], _PCFKernel[5]) + offset, shadowCoord.z)) +
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ShadowAttenuation(half3(shadowCoord.xy + half2(_PCFKernel[6], _PCFKernel[7]) + offset, shadowCoord.z));
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return attenuation * 0.25;
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}
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inline half ComputeShadowAttenuation(float3 posWorld, half3 vertexNormal, half3 shadowDir)
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{
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half NdotL = dot(vertexNormal, shadowDir);
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half bias = saturate(1.0 - NdotL) * _ShadowData.z;
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float3 posWorldOffsetNormal = posWorld + vertexNormal * bias;
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int cascadeIndex = 0;
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#ifdef _SHADOW_CASCADES
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cascadeIndex = ComputeCascadeIndex(posWorldOffsetNormal);
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if (cascadeIndex >= MAX_SHADOW_CASCADES)
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return 1.0;
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#endif
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float4 shadowCoord = mul(_WorldToShadow[cascadeIndex], float4(posWorldOffsetNormal, 1.0));
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shadowCoord.xyz /= shadowCoord.w;
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shadowCoord.z = saturate(shadowCoord.z);
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#if defined(_SOFT_SHADOWS) || defined(_SOFT_SHADOWS_CASCADES)
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return ShadowPCF(shadowCoord.xyz);
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#else
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return ShadowAttenuation(shadowCoord.xyz);
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#endif
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}
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#endif
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