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85 行
3.7 KiB
85 行
3.7 KiB
// In unity we can have a mix of fully baked lightmap (static lightmap) + enlighten realtime lightmap (dynamic lightmap)
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// for each case we can have directional lightmap or not.
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// Else we have lightprobe for dynamic/moving entity. Either SH9 per object lightprobe or SH4 per pixel per object volume probe
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float3 SampleBakedGI(float3 positionWS, float3 normalWS, float2 uvStaticLightmap, float2 uvDynamicLightmap)
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{
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// If there is no lightmap, it assume lightprobe
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#if !defined(LIGHTMAP_ON) && !defined(DYNAMICLIGHTMAP_ON)
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// TODO: Confirm with Ionut but it seems that UNITY_LIGHT_PROBE_PROXY_VOLUME is always define for high end and
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// unity_ProbeVolumeParams always bind.
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if (unity_ProbeVolumeParams.x == 0.0)
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{
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// TODO: pass a tab of coefficient instead!
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float4 SHCoefficients[7];
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SHCoefficients[0] = unity_SHAr;
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SHCoefficients[1] = unity_SHAg;
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SHCoefficients[2] = unity_SHAb;
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SHCoefficients[3] = unity_SHBr;
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SHCoefficients[4] = unity_SHBg;
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SHCoefficients[5] = unity_SHBb;
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SHCoefficients[6] = unity_SHC;
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return SampleSH9(SHCoefficients, normalWS);
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}
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else
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{
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// TODO: Move all this to C++!
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float4x4 identity = 0;
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identity._m00_m11_m22_m33 = 1.0;
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float4x4 WorldToTexture = (unity_ProbeVolumeParams.y == 1.0f) ? unity_ProbeVolumeWorldToObject : identity;
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float4x4 translation = identity;
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translation._m30_m31_m32 = -unity_ProbeVolumeMin.xyz;
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float4x4 scale = 0;
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scale._m00_m11_m22_m33 = float4(unity_ProbeVolumeSizeInv.xyz, 1.0);
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WorldToTexture = mul(mul(scale, translation), WorldToTexture);
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return SampleProbeVolumeSH4(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), positionWS, normalWS, WorldToTexture, unity_ProbeVolumeParams.z);
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}
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#else
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float3 bakeDiffuseLighting = float3(0.0, 0.0, 0.0);
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#ifdef LIGHTMAP_ON
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#ifdef DIRLIGHTMAP_COMBINED
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bakeDiffuseLighting += SampleDirectionalLightmap(TEXTURE2D_PARAM(unity_Lightmap, samplerunity_Lightmap),
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TEXTURE2D_PARAM(unity_LightmapInd, samplerunity_Lightmap),
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uvStaticLightmap, unity_LightmapST, normalWS, true);
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#else
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bakeDiffuseLighting += SampleSingleLightmap(TEXTURE2D_PARAM(unity_Lightmap, samplerunity_Lightmap), uvStaticLightmap, unity_LightmapST, true);
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#endif
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#endif
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#ifdef DYNAMICLIGHTMAP_ON
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#ifdef DIRLIGHTMAP_COMBINED
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bakeDiffuseLighting += SampleDirectionalLightmap(TEXTURE2D_PARAM(unity_DynamicLightmap, samplerunity_DynamicLightmap),
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TEXTURE2D_PARAM(unity_DynamicDirectionality, samplerunity_DynamicLightmap),
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uvDynamicLightmap, unity_DynamicLightmapST, normalWS, false);
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#else
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bakeDiffuseLighting += SampleSingleLightmap(TEXTURE2D_PARAM(unity_DynamicLightmap, samplerunity_DynamicLightmap), uvDynamicLightmap, unity_DynamicLightmapST, false);
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#endif
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#endif
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return bakeDiffuseLighting;
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#endif
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}
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float2 CalculateVelocity(float4 positionCS, float4 previousPositionCS)
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{
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// This test on define is required to remove warning of divide by 0 when initializing empty struct
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// TODO: Add forward opaque MRT case...
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#if (SHADERPASS == SHADERPASS_VELOCITY) || (SHADERPASS == SHADERPASS_GBUFFER && SHADEROPTIONS_VELOCITY_IN_GBUFFER)
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// Encode velocity
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positionCS.xy = positionCS.xy / positionCS.w;
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previousPositionCS.xy = previousPositionCS.xy / previousPositionCS.w;
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return (positionCS.xy - previousPositionCS.xy) * _ForceNoMotion;
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#else
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return float2(0.0, 0.0);
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#endif
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}
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