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// In unity we can have a mix of fully baked lightmap (static lightmap) + enlighten realtime lightmap (dynamic lightmap)
// for each case we can have directional lightmap or not.
// Else we have lightprobe for dynamic/moving entity. Either SH9 per object lightprobe or SH4 per pixel per object volume probe
float3 SampleBakedGI(float3 positionWS, float3 normalWS, float2 uvStaticLightmap, float2 uvDynamicLightmap)
{
// If there is no lightmap, it assume lightprobe
#if !defined(LIGHTMAP_ON) && !defined(DYNAMICLIGHTMAP_ON)
// TODO: Confirm with Ionut but it seems that UNITY_LIGHT_PROBE_PROXY_VOLUME is always define for high end and
// unity_ProbeVolumeParams always bind.
if (unity_ProbeVolumeParams.x == 0.0)
{
// TODO: pass a tab of coefficient instead!
float4 SHCoefficients[7];
SHCoefficients[0] = unity_SHAr;
SHCoefficients[1] = unity_SHAg;
SHCoefficients[2] = unity_SHAb;
SHCoefficients[3] = unity_SHBr;
SHCoefficients[4] = unity_SHBg;
SHCoefficients[5] = unity_SHBb;
SHCoefficients[6] = unity_SHC;
return SampleSH9(SHCoefficients, normalWS);
}
else
{
// TODO: We use GetAbsolutePositionWS(positionWS) to handle the camera relative case here but this should be part of the unity_ProbeVolumeWorldToObject matrix on C++ side (sadly we can't modify it for HDRenderPipeline...)
return SampleProbeVolumeSH4(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), GetAbsolutePositionWS(positionWS), normalWS, unity_ProbeVolumeWorldToObject,
unity_ProbeVolumeParams.y, unity_ProbeVolumeParams.z, unity_ProbeVolumeMin, unity_ProbeVolumeSizeInv);
}
#else
float3 bakeDiffuseLighting = float3(0.0, 0.0, 0.0);
#ifdef UNITY_LIGHTMAP_FULL_HDR
bool useRGBMLightmap = false;
#else
bool useRGBMLightmap = true;
#endif
#ifdef LIGHTMAP_ON
#ifdef DIRLIGHTMAP_COMBINED
bakeDiffuseLighting += SampleDirectionalLightmap(TEXTURE2D_PARAM(unity_Lightmap, samplerunity_Lightmap),
TEXTURE2D_PARAM(unity_LightmapInd, samplerunity_Lightmap),
uvStaticLightmap, unity_LightmapST, normalWS, useRGBMLightmap);
#else
bakeDiffuseLighting += SampleSingleLightmap(TEXTURE2D_PARAM(unity_Lightmap, samplerunity_Lightmap), uvStaticLightmap, unity_LightmapST, useRGBMLightmap);
#endif
#endif
#ifdef DYNAMICLIGHTMAP_ON
#ifdef DIRLIGHTMAP_COMBINED
bakeDiffuseLighting += SampleDirectionalLightmap(TEXTURE2D_PARAM(unity_DynamicLightmap, samplerunity_DynamicLightmap),
TEXTURE2D_PARAM(unity_DynamicDirectionality, samplerunity_DynamicLightmap),
uvDynamicLightmap, unity_DynamicLightmapST, normalWS, false);
#else
bakeDiffuseLighting += SampleSingleLightmap(TEXTURE2D_PARAM(unity_DynamicLightmap, samplerunity_DynamicLightmap), uvDynamicLightmap, unity_DynamicLightmapST, false);
#endif
#endif
return bakeDiffuseLighting;
#endif
}
float4 SampleShadowMask(float3 positionWS, float2 uvStaticLightmap) // normalWS not use for now
{
#if defined(LIGHTMAP_ON)
float2 uv = uvStaticLightmap * unity_LightmapST.xy + unity_LightmapST.zw;
float4 rawOcclusionMask = SAMPLE_TEXTURE2D(unity_ShadowMask, samplerunity_Lightmap, uv); // Reuse sampler from Lightmap
#else
float4 rawOcclusionMask;
if (unity_ProbeVolumeParams.x == 1.0)
{
// TODO: We use GetAbsolutePositionWS(positionWS) to handle the camera relative case here but this should be part of the unity_ProbeVolumeWorldToObject matrix on C++ side (sadly we can't modify it for HDRenderPipeline...)
rawOcclusionMask = SampleProbeOcclusion(TEXTURE3D_PARAM(unity_ProbeVolumeSH, samplerunity_ProbeVolumeSH), GetAbsolutePositionWS(positionWS), unity_ProbeVolumeWorldToObject,
unity_ProbeVolumeParams.y, unity_ProbeVolumeParams.z, unity_ProbeVolumeMin, unity_ProbeVolumeSizeInv);
}
else
{
// Note: Default value when the feature is not enabled is float(1.0, 1.0, 1.0, 1.0) in C++
rawOcclusionMask = unity_ProbesOcclusion;
}
#endif
return rawOcclusionMask;
}
float2 CalculateVelocity(float4 positionCS, float4 previousPositionCS)
{
// This test on define is required to remove warning of divide by 0 when initializing empty struct
// TODO: Add forward opaque MRT case...
#if (SHADERPASS == SHADERPASS_VELOCITY)
// Encode velocity
positionCS.xy = positionCS.xy / positionCS.w;
previousPositionCS.xy = previousPositionCS.xy / previousPositionCS.w;
float2 velocity = (positionCS.xy - previousPositionCS.xy);
#if UNITY_UV_STARTS_AT_TOP
velocity.y = -velocity.y;
#endif
return velocity;
#else
return float2(0.0, 0.0);
#endif
}
// Flipping or mirroring a normal can be done directly on the tangent space. This has the benefit to apply to the whole process either in surface gradient or not.
// This function will modify FragInputs and this is not propagate outside of GetSurfaceAndBuiltinData(). This is ok as tangent space is not use outside of GetSurfaceAndBuiltinData().
void ApplyDoubleSidedFlipOrMirror(inout FragInputs input)
{
#ifdef _DOUBLESIDED_ON
// _DoubleSidedConstants is float3(-1, -1, -1) in flip mode and float3(1, 1, -1) in mirror mode
// To get a flipped normal with the tangent space, we must flip bitangent (because it is construct from the normal) and normal
// To get a mirror normal with the tangent space, we only need to flip the normal and not the tangent
float2 flipSign = input.isFrontFace ? float2(1.0, 1.0) : _DoubleSidedConstants.yz; // TOCHECK : GetOddNegativeScale() is not necessary here as it is apply for tangent space creation.
input.worldToTangent[1] = flipSign.x * input.worldToTangent[1]; // bitangent
input.worldToTangent[2] = flipSign.y * input.worldToTangent[2]; // normal
#ifdef SURFACE_GRADIENT
// TOCHECK: seems that we don't need to invert any genBasisTB(), sign cancel. Which is expected as we deal with surface gradient.
// TODO: For surface gradient we must invert or mirror the normal just after the interpolation. It will allow to work with layered with all basis. Currently it is not the case
#endif
#endif
}
// This function convert the tangent space normal/tangent to world space and orthonormalize it + apply a correction of the normal if it is not pointing towards the near plane
void GetNormalWS(FragInputs input, float3 V, float3 normalTS, out float3 normalWS)
{
#ifdef SURFACE_GRADIENT
normalWS = SurfaceGradientResolveNormal(input.worldToTangent[2], normalTS);
#else
// We need to normalize as we use mikkt tangent space and this is expected (tangent space is not normalize)
normalWS = normalize(TransformTangentToWorld(normalTS, input.worldToTangent));
#endif
}