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struct v2f |
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{ |
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float4 uv01 : TEXCOORD0; // uv01.xy: uv0, uv01.zw: uv1 |
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float4 posWS : TEXCOORD1; // xyz: posWorld |
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float3 posWS : TEXCOORD1; |
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half3 tangentToWorld[3] : TEXCOORD2; // tangentToWorld matrix |
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half3 tangentToWorld0 : TEXCOORD2; // tangentToWorld matrix |
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half3 tangentToWorld1 : TEXCOORD3; // tangentToWorld matrix |
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half3 tangentToWorld2 : TEXCOORD4; // tangentToWorld matrix |
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float4 hpos : SV_POSITION; |
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#ifndef _SHADOW_CASCADES |
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float3 shadowCoord : TEXCOORD7; |
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#endif |
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float4 hpos : SV_POSITION; |
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}; |
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// The variables are very similar to built-in unity_LightColor, unity_LightPosition, |
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// glsl compiler will generate underperforming code by using a row-major pre multiplication matrix: mul(normalmap, i.tangentToWorld) |
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// i.tangetToWorld was initialized as column-major in vs and here dot'ing individual for better performance. |
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// The code below is similar to post multiply: mul(i.tangentToWorld, normalmap) |
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normal = half3(dot(normalmap, i.tangentToWorld[0]), dot(normalmap, i.tangentToWorld[1]), dot(normalmap, i.tangentToWorld[2])); |
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normal = half3(dot(normalmap, i.tangentToWorld0), dot(normalmap, i.tangentToWorld1), dot(normalmap, i.tangentToWorld2)); |
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#else |
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normal = normalize(i.normal); |
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#endif |
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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 = float4(distances2 < vDirShadowSplitSphereSqRadii); |
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fixed4 weights = fixed4(distances2 < vDirShadowSplitSphereSqRadii); |
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return 4 - dot(weights, float4(4, 3, 2, 1)); |
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return 4 - dot(weights, fixed4(4, 3, 2, 1)); |
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} |
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inline half ShadowAttenuation(half2 shadowCoord, half shadowCoordDepth) |
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#endif |
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} |
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inline half ShadowPCF(half4 shadowCoord) |
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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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float distanceSqr = max(dot(posToLight, posToLight), 0.001); |
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float lightAtten = 1.0 / (1.0 + distanceSqr * lightInput.atten.z); |
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float3 lightDir = posToLight * rsqrt(distanceSqr); |
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float SdotL = saturate(dot(lightInput.spotDir.xyz, lightDir)); |
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half3 lightDir = posToLight * rsqrt(distanceSqr); |
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half SdotL = saturate(dot(lightInput.spotDir.xyz, lightDir)); |
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float cutoff = step(distanceSqr, lightInput.atten.w); |
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half cutoff = step(distanceSqr, lightInput.atten.w); |
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float NdotL = saturate(dot(normal, lightDir)); |
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half NdotL = saturate(dot(normal, lightDir)); |
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half3 halfVec = normalize(lightDir + viewDir); |
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half NdotH = saturate(dot(normal, halfVec)); |
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#endif |
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} |
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inline half3 EvaluateMainLight(LightInput lightInput, half3 diffuseColor, half4 specularGloss, half3 normal, float4 posWorld, half3 viewDir) |
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inline half ComputeShadowAttenuation(v2f i) |
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half3 color = EvaluateOneLight(lightInput, diffuseColor, specularGloss, normal, posWorld, viewDir); |
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#if defined(HARD_SHADOWS) || defined(SOFT_SHADOWS) |
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int cascadeIndex = ComputeCascadeIndex(posWorld); |
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half shadowAttenuation = 1.0; |
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if (cascadeIndex < 4) |
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{ |
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float4 shadowCoord = mul(_WorldToShadow[cascadeIndex], float4(posWorld.xyz, 1.0)); |
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shadowCoord.z = saturate(shadowCoord.z); |
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#ifdef SOFT_SHADOWS |
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shadowAttenuation = ShadowPCF(shadowCoord); |
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#else |
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shadowAttenuation = ShadowAttenuation(shadowCoord.xy, shadowCoord.z); |
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half3 shadowCoord; |
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#ifndef _SHADOW_CASCADES |
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shadowCoord = i.shadowCoord; |
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#else |
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int cascadeIndex = ComputeCascadeIndex(i.posWS); |
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if (cascadeIndex < 4) |
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shadowCoord = mul(_WorldToShadow[cascadeIndex], half4(i.posWS, 1.0)).xyz; |
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else |
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return 1.0; |
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} |
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#if DEBUG_CASCADES |
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half3 cascadeColors[MAX_SHADOW_CASCADES] = {half3(1.0, 0.0, 0.0), half3(0.0, 1.0, 0.0), half3(0.0, 0.0, 1.0), half3(1.0, 0.0, 1.0)}; |
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return cascadeColors[cascadeIndex] * diffuseColor * max(shadowAttenuation, 0.5); |
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#endif |
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shadowCoord.z = saturate(shadowCoord.z); |
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return color * shadowAttenuation; |
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#ifdef SOFT_SHADOWS |
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return ShadowPCF(shadowCoord); |
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return color; |
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return ShadowAttenuation(shadowCoord.xy, shadowCoord.z); |
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#endif |
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} |
Felipe Lira
7 年前