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refactor: shift probe to probe blending logic itsself on out to it's own method to make thatg end easeier to deal with in isolation. (though does still depend on a bit of upstream calculation in the form of tracking how many probes hit a given pixel, and 'how hard' as it wetre from the attenuation calcs,

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Azaezel 2019-03-24 18:04:41 -05:00
parent de8b267780
commit 3af1129e75
1 changed files with 48 additions and 43 deletions
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91
Templates/Full/game/shaders/common/lighting/advanced/reflectionProbeArrayP.hlsl
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@ -152,6 +152,52 @@ float3 iblSkylightSpecular(Surface surface, ProbeData probe)
return color; return color;
} }
void blendProbes(ProbeData probes[MAX_PROBES], float blendSum, float probehits)
{
int i = 0;
float blendFactor[MAX_PROBES];
float blendFacSum = 0;
// Weight0 = normalized NDF, inverted to have 1 at center, 0 at boundary.
// And as we invert, we need to divide by Num-1 to stay normalized (else sum is > 1).
// respect constraint B.
// Weight1 = normalized inverted NDF, so we have 1 at center, 0 at boundary
// and respect constraint A.
for (i = 0; i < numProbes; i++)
{
if (probehits>1.0)
{
blendFactor[i] = ((probes[i].contribution / blendSum)) / (probehits - 1);
blendFactor[i] *= ((probes[i].contribution) / (1.0-blendSum));
blendFacSum += blendFactor[i];
}
else
{
blendFactor[i] = probes[i].contribution;
blendFacSum = probes[i].contribution;
}
}
// Normalize blendVal
#if DEBUGVIZ_ATTENUATION == 0 //this can likely be removed when we fix the above normalization behavior
if (blendFacSum == 0.0f) // Possible with custom weight
{
blendFacSum = 1.0f;
}
#endif
//use probehits for sharp cuts when singular,
//blendSum when wanting blend on all edging
if (blendSum>1.0)
{
float invBlendSumWeighted = 1.0f / blendFacSum;
for (i = 0; i < numProbes; ++i)
{
blendFactor[i] *= invBlendSumWeighted;
probes[i].contribution = blendFactor[i];
}
}
}
float4 main( PFXVertToPix IN ) : SV_TARGET float4 main( PFXVertToPix IN ) : SV_TARGET
{ {
//unpack normal and linear depth //unpack normal and linear depth
@ -168,10 +214,7 @@ float4 main( PFXVertToPix IN ) : SV_TARGET
} }
int i = 0; int i = 0;
float blendFactor[MAX_PROBES];
float blendSum = 0; float blendSum = 0;
float blendFacSum = 0;
float invBlendSum = 0;
int skyID = 0; int skyID = 0;
float probehits = 0; float probehits = 0;
//Set up our struct data //Set up our struct data
@ -212,47 +255,9 @@ float4 main( PFXVertToPix IN ) : SV_TARGET
probes[i].contribution = 0; probes[i].contribution = 0;
blendSum += probes[i].contribution; blendSum += probes[i].contribution;
invBlendSum += (1.0f - probes[i].contribution);
}
// Weight0 = normalized NDF, inverted to have 1 at center, 0 at boundary.
// And as we invert, we need to divide by Num-1 to stay normalized (else sum is > 1).
// respect constraint B.
// Weight1 = normalized inverted NDF, so we have 1 at center, 0 at boundary
// and respect constraint A.
for (i = 0; i < numProbes; i++)
{
if (probehits>1.0)
{
blendFactor[i] = ((probes[i].contribution / blendSum)) / (probehits - 1);
blendFactor[i] *= ((probes[i].contribution) / invBlendSum);
blendFacSum += blendFactor[i];
}
else
{
blendFactor[i] = probes[i].contribution;
blendFacSum = probes[i].contribution;
}
}
// Normalize blendVal
#if DEBUGVIZ_ATTENUATION == 0 //this can likely be removed when we fix the above normalization behavior
if (blendFacSum == 0.0f) // Possible with custom weight
{
blendFacSum = 1.0f;
}
#endif
//use probehits for sharp cuts when singular,
//blendSum when wanting blend on all edging
if (blendSum>1.0)
{
float invBlendSumWeighted = 1.0f / blendFacSum;
for (i = 0; i < numProbes; ++i)
{
blendFactor[i] *= invBlendSumWeighted;
probes[i].contribution = blendFactor[i];
}
} }
blendProbes(probes, blendSum, probehits);
#if DEBUGVIZ_ATTENUATION == 1 #if DEBUGVIZ_ATTENUATION == 1
float attenVis = 0; float attenVis = 0;
for (i = 0; i < numProbes; ++i) for (i = 0; i < numProbes; ++i)