You've already forked UnrealEngineUWP
mirror of
https://github.com/izzy2lost/UnrealEngineUWP.git
synced 2026-03-26 18:15:20 -07:00
52b23c8d20
AlphaCoverageThresholds was accidentally enabled for all textures with thresholds = {0,0,0,1}
add new Texture bool bDoScaleMipsForAlphaCoverage
to make toggling coverage processing very clear
on old Textures that don't have the bDoScaleMipsForAlphaCoverage field, we can infer the correct value except in the case that threshold = {0,0,0,1} , in that case it's impossible to tell if it's wanted or not. There we look up a config value "EnableLegacyAlphaCoverageThresholdScaling"
Current config has EnableLegacyAlphaCoverageThresholdScaling=1
so the legacy bad behavior is maintained
#rb fabian.giesen,julien.stjean
#preflight 6205c4050d0c8cd8aba6dd9d
[CL 18952713 by charles bloom in ue5-main branch]
2817 lines
90 KiB
C++
2817 lines
90 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
|
|
|
|
#include "TextureCompressorModule.h"
|
|
#include "Math/RandomStream.h"
|
|
#include "Containers/IndirectArray.h"
|
|
#include "Stats/Stats.h"
|
|
#include "Async/AsyncWork.h"
|
|
#include "Async/ParallelFor.h"
|
|
#include "Modules/ModuleManager.h"
|
|
#include "Engine/TextureDefines.h"
|
|
#include "TextureFormatManager.h"
|
|
#include "Interfaces/ITextureFormat.h"
|
|
#include "Misc/Paths.h"
|
|
#include "ImageCore.h"
|
|
#include <cmath>
|
|
|
|
#if PLATFORM_WINDOWS
|
|
#include "Windows/WindowsHWrapper.h"
|
|
#endif
|
|
|
|
DEFINE_LOG_CATEGORY_STATIC(LogTextureCompressor, Log, All);
|
|
|
|
/*------------------------------------------------------------------------------
|
|
Mip-Map Generation
|
|
------------------------------------------------------------------------------*/
|
|
|
|
enum EMipGenAddressMode
|
|
{
|
|
MGTAM_Wrap,
|
|
MGTAM_Clamp,
|
|
MGTAM_BorderBlack,
|
|
};
|
|
|
|
/**
|
|
* 2D view into one slice of an image.
|
|
*/
|
|
struct FImageView2D
|
|
{
|
|
/** Pointer to colors in the slice. */
|
|
FLinearColor* SliceColors;
|
|
/** Width of the slice. */
|
|
int32 SizeX;
|
|
/** Height of the slice. */
|
|
int32 SizeY;
|
|
|
|
FImageView2D() : SliceColors(nullptr), SizeX(0), SizeY(0) {}
|
|
|
|
/** Initialization constructor. */
|
|
FImageView2D(FImage& Image, int32 SliceIndex)
|
|
{
|
|
SizeX = Image.SizeX;
|
|
SizeY = Image.SizeY;
|
|
SliceColors = (&Image.AsRGBA32F()[0]) + SliceIndex * SizeY * SizeX;
|
|
}
|
|
|
|
/** Access a single texel. */
|
|
FLinearColor& Access(int32 X, int32 Y)
|
|
{
|
|
return SliceColors[X + Y * SizeX];
|
|
}
|
|
|
|
/** Const access to a single texel. */
|
|
const FLinearColor& Access(int32 X, int32 Y) const
|
|
{
|
|
return SliceColors[X + Y * SizeX];
|
|
}
|
|
|
|
bool IsValid() const { return SliceColors != nullptr; }
|
|
|
|
static const FImageView2D ConstructConst(const FImage& Image, int32 SliceIndex)
|
|
{
|
|
return FImageView2D(const_cast<FImage&>(Image), SliceIndex);
|
|
}
|
|
|
|
};
|
|
|
|
// 2D sample lookup with input conversion
|
|
// requires SourceImageData.SizeX and SourceImageData.SizeY to be power of two
|
|
template <EMipGenAddressMode AddressMode>
|
|
FLinearColor LookupSourceMip(const FImageView2D& SourceImageData, int32 X, int32 Y)
|
|
{
|
|
if(AddressMode == MGTAM_Wrap)
|
|
{
|
|
// wrap
|
|
X = (int32)((uint32)X) & (SourceImageData.SizeX - 1);
|
|
Y = (int32)((uint32)Y) & (SourceImageData.SizeY - 1);
|
|
}
|
|
else if(AddressMode == MGTAM_Clamp)
|
|
{
|
|
// clamp
|
|
X = FMath::Clamp(X, 0, SourceImageData.SizeX - 1);
|
|
Y = FMath::Clamp(Y, 0, SourceImageData.SizeY - 1);
|
|
}
|
|
else if(AddressMode == MGTAM_BorderBlack)
|
|
{
|
|
// border color 0
|
|
if((uint32)X >= (uint32)SourceImageData.SizeX
|
|
|| (uint32)Y >= (uint32)SourceImageData.SizeY)
|
|
{
|
|
return FLinearColor(0, 0, 0, 0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
check(0);
|
|
}
|
|
//return *(SourceImageData.AsRGBA32F() + X + Y * SourceImageData.SizeX);
|
|
return SourceImageData.Access(X,Y);
|
|
}
|
|
|
|
// Kernel class for image filtering operations like image downsampling
|
|
// at max MaxKernelExtend x MaxKernelExtend
|
|
class FImageKernel2D
|
|
{
|
|
public:
|
|
FImageKernel2D() :FilterTableSize(0)
|
|
{
|
|
}
|
|
|
|
// @param TableSize1D 2 for 2x2, 4 for 4x4, 6 for 6x6, 8 for 8x8
|
|
// @param SharpenFactor can be negative to blur
|
|
// generate normalized 2D Kernel with sharpening
|
|
void BuildSeparatableGaussWithSharpen(uint32 TableSize1D, float SharpenFactor = 0.0f)
|
|
{
|
|
if(TableSize1D > MaxKernelExtend)
|
|
{
|
|
TableSize1D = MaxKernelExtend;
|
|
}
|
|
|
|
float Table1D[MaxKernelExtend];
|
|
float NegativeTable1D[MaxKernelExtend];
|
|
|
|
FilterTableSize = TableSize1D;
|
|
|
|
if(SharpenFactor < 0.0f)
|
|
{
|
|
// blur only
|
|
BuildGaussian1D(Table1D, TableSize1D, 1.0f, -SharpenFactor);
|
|
BuildFilterTable2DFrom1D(KernelWeights, Table1D, TableSize1D);
|
|
return;
|
|
}
|
|
else if(TableSize1D == 2)
|
|
{
|
|
// 2x2 kernel: simple average
|
|
KernelWeights[0] = KernelWeights[1] = KernelWeights[2] = KernelWeights[3] = 0.25f;
|
|
return;
|
|
}
|
|
else if(TableSize1D == 4)
|
|
{
|
|
// 4x4 kernel with sharpen or blur: can alias a bit
|
|
BuildFilterTable1DBase(Table1D, TableSize1D, 1.0f + SharpenFactor);
|
|
BuildFilterTable1DBase(NegativeTable1D, TableSize1D, -SharpenFactor);
|
|
BlurFilterTable1D(NegativeTable1D, TableSize1D, 1);
|
|
}
|
|
else if(TableSize1D == 6)
|
|
{
|
|
// 6x6 kernel with sharpen or blur: still can alias
|
|
BuildFilterTable1DBase(Table1D, TableSize1D, 1.0f + SharpenFactor);
|
|
BuildFilterTable1DBase(NegativeTable1D, TableSize1D, -SharpenFactor);
|
|
BlurFilterTable1D(NegativeTable1D, TableSize1D, 2);
|
|
}
|
|
else if(TableSize1D == 8)
|
|
{
|
|
//8x8 kernel with sharpen or blur
|
|
|
|
// * 2 to get similar appearance as for TableSize 6
|
|
SharpenFactor = SharpenFactor * 2.0f;
|
|
|
|
BuildFilterTable1DBase(Table1D, TableSize1D, 1.0f + SharpenFactor);
|
|
// positive lobe is blurred a bit for better quality
|
|
BlurFilterTable1D(Table1D, TableSize1D, 1);
|
|
BuildFilterTable1DBase(NegativeTable1D, TableSize1D, -SharpenFactor);
|
|
BlurFilterTable1D(NegativeTable1D, TableSize1D, 3);
|
|
}
|
|
else
|
|
{
|
|
// not yet supported
|
|
check(0);
|
|
}
|
|
|
|
AddFilterTable1D(Table1D, NegativeTable1D, TableSize1D);
|
|
BuildFilterTable2DFrom1D(KernelWeights, Table1D, TableSize1D);
|
|
}
|
|
|
|
inline uint32 GetFilterTableSize() const
|
|
{
|
|
return FilterTableSize;
|
|
}
|
|
|
|
inline float GetAt(uint32 X, uint32 Y) const
|
|
{
|
|
checkSlow(X < FilterTableSize);
|
|
checkSlow(Y < FilterTableSize);
|
|
return KernelWeights[X + Y * FilterTableSize];
|
|
}
|
|
|
|
inline float& GetRefAt(uint32 X, uint32 Y)
|
|
{
|
|
checkSlow(X < FilterTableSize);
|
|
checkSlow(Y < FilterTableSize);
|
|
return KernelWeights[X + Y * FilterTableSize];
|
|
}
|
|
|
|
private:
|
|
|
|
inline static float NormalDistribution(float X, float Variance)
|
|
{
|
|
const float StandardDeviation = FMath::Sqrt(Variance);
|
|
return FMath::Exp(-FMath::Square(X) / (2.0f * Variance)) / (StandardDeviation * FMath::Sqrt(2.0f * (float)PI));
|
|
}
|
|
|
|
// support even and non even sized filters
|
|
static void BuildGaussian1D(float *InOutTable, uint32 TableSize, float Sum, float Variance)
|
|
{
|
|
float Center = TableSize * 0.5f;
|
|
float CurrentSum = 0;
|
|
for(uint32 i = 0; i < TableSize; ++i)
|
|
{
|
|
float Actual = NormalDistribution(i - Center + 0.5f, Variance);
|
|
InOutTable[i] = Actual;
|
|
CurrentSum += Actual;
|
|
}
|
|
// Normalize
|
|
float InvSum = Sum / CurrentSum;
|
|
for(uint32 i = 0; i < TableSize; ++i)
|
|
{
|
|
InOutTable[i] *= InvSum;
|
|
}
|
|
}
|
|
|
|
//
|
|
static void BuildFilterTable1DBase(float *InOutTable, uint32 TableSize, float Sum )
|
|
{
|
|
// we require a even sized filter
|
|
check(TableSize % 2 == 0);
|
|
|
|
float Inner = 0.5f * Sum;
|
|
|
|
uint32 Center = TableSize / 2;
|
|
for(uint32 x = 0; x < TableSize; ++x)
|
|
{
|
|
if(x == Center || x == Center - 1)
|
|
{
|
|
// center elements
|
|
InOutTable[x] = Inner;
|
|
}
|
|
else
|
|
{
|
|
// outer elements
|
|
InOutTable[x] = 0.0f;
|
|
}
|
|
}
|
|
}
|
|
|
|
// InOutTable += InTable
|
|
static void AddFilterTable1D( float *InOutTable, float *InTable, uint32 TableSize )
|
|
{
|
|
for(uint32 x = 0; x < TableSize; ++x)
|
|
{
|
|
InOutTable[x] += InTable[x];
|
|
}
|
|
}
|
|
|
|
// @param Times 1:box, 2:triangle, 3:pow2, 4:pow3, ...
|
|
// can be optimized with double buffering but doesn't need to be fast
|
|
static void BlurFilterTable1D( float *InOutTable, uint32 TableSize, uint32 Times )
|
|
{
|
|
check(Times>0);
|
|
check(TableSize<32);
|
|
|
|
float Intermediate[32];
|
|
|
|
for(uint32 Pass = 0; Pass < Times; ++Pass)
|
|
{
|
|
for(uint32 x = 0; x < TableSize; ++x)
|
|
{
|
|
Intermediate[x] = InOutTable[x];
|
|
}
|
|
|
|
for(uint32 x = 0; x < TableSize; ++x)
|
|
{
|
|
float sum = Intermediate[x];
|
|
|
|
if(x)
|
|
{
|
|
sum += Intermediate[x-1];
|
|
}
|
|
if(x < TableSize - 1)
|
|
{
|
|
sum += Intermediate[x+1];
|
|
}
|
|
|
|
InOutTable[x] = sum / 3.0f;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void BuildFilterTable2DFrom1D( float *OutTable2D, float *InTable1D, uint32 TableSize )
|
|
{
|
|
for(uint32 y = 0; y < TableSize; ++y)
|
|
{
|
|
for(uint32 x = 0; x < TableSize; ++x)
|
|
{
|
|
OutTable2D[x + y * TableSize] = InTable1D[y] * InTable1D[x];
|
|
}
|
|
}
|
|
}
|
|
|
|
// at max we support MaxKernelExtend x MaxKernelExtend kernels
|
|
const static uint32 MaxKernelExtend = 12;
|
|
// 0 if no kernel was setup yet
|
|
uint32 FilterTableSize;
|
|
// normalized, means the sum of it should be 1.0f
|
|
float KernelWeights[MaxKernelExtend * MaxKernelExtend];
|
|
};
|
|
|
|
static float DetermineScaledThreshold(float Threshold, float Scale)
|
|
{
|
|
check(Threshold > 0.f && Scale > 0.f);
|
|
|
|
// Assuming Scale > 0 and Threshold > 0, find ScaledThreshold such that
|
|
// x * Scale >= Threshold
|
|
// is exactly equivalent to
|
|
// x >= ScaledThreshold.
|
|
//
|
|
// This is for a test that was originally written in the first form that we want to
|
|
// transform to the second form without changing results (which would in turn change
|
|
// texture cooks).
|
|
//
|
|
// In exact arithmetic, this is just ScaledThreshold = Threshold / Scale.
|
|
//
|
|
// In floating point, we need to consider rounding. Computed in floating point
|
|
// and assuming round-to-nearest (breaking ties towards even), we get
|
|
//
|
|
// RN(x * Scale) >= Threshold
|
|
//
|
|
// The smallest conceivable x that passes RN(x * Scale) >= Threshold is
|
|
// x = (Threshold - 0.5u) / Scale, landing exactly halfway with the rounding
|
|
// going up; this is slightly less than an exact Threshold/Scale.
|
|
//
|
|
// For regular floating point division, we get
|
|
// RN(Threshold / Scale)
|
|
// = (Threshold / Scale) * (1 + e), |e| < 0.5u (the inequality is strict for divisions)
|
|
//
|
|
// That gets us relatively close to the target value, but we have no guarantee that rounding
|
|
// on the division was in the direction we wanted. Just check whether our target inequality
|
|
// is satisfied and bump up or down to the next representable float as required.
|
|
float ScaledThreshold = Threshold / Scale;
|
|
float SteppedDown = std::nextafter(ScaledThreshold, 0.f);
|
|
|
|
// We want ScaledThreshold to be the smallest float such that
|
|
// ScaledThreshold * Scale >= Threshold
|
|
// meaning the next-smaller float below ScaledThreshold (which is SteppedDown)
|
|
// should not be >=Threshold.
|
|
|
|
if (SteppedDown * Scale >= Threshold)
|
|
{
|
|
// We were too large, go down by 1 ulp
|
|
ScaledThreshold = SteppedDown;
|
|
}
|
|
else if (ScaledThreshold * Scale < Threshold)
|
|
{
|
|
// We were too small, go up by 1 ulp
|
|
ScaledThreshold = std::nextafter(ScaledThreshold, 2.f * ScaledThreshold);
|
|
}
|
|
|
|
// We should now have the right threshold:
|
|
check(ScaledThreshold * Scale >= Threshold); // ScaledThreshold is large enough
|
|
check(std::nextafter(ScaledThreshold, 0.f) * Scale < Threshold); // next below is too small
|
|
|
|
return ScaledThreshold;
|
|
}
|
|
|
|
|
|
static FVector4f ComputeAlphaCoverage(const FVector4f& Thresholds, const FVector4f& Scales, const FImageView2D& SourceImageData)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(ComputeAlphaCoverage);
|
|
|
|
FVector4f Coverage(0, 0, 0, 0);
|
|
|
|
int32 NumRowsEachJob;
|
|
int32 NumJobs = ImageParallelForComputeNumJobsForRows(NumRowsEachJob,SourceImageData.SizeX,SourceImageData.SizeY);
|
|
|
|
if ( Thresholds[0] == 0.f && Thresholds[1] == 0.f && Thresholds[2] == 0.f )
|
|
{
|
|
// common case that only channel 3 (A) is used for alpha coverage :
|
|
|
|
check( Thresholds[3] != 0.f );
|
|
|
|
const float ThresholdScaled = DetermineScaledThreshold(Thresholds[3] , Scales[3]);
|
|
|
|
int32 CommonResult = 0;
|
|
ParallelFor(NumJobs, [&](int32 Index)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(ComputeAlphaCoverage.PF);
|
|
|
|
int32 StartIndex = Index * NumRowsEachJob;
|
|
int32 EndIndex = FMath::Min(StartIndex + NumRowsEachJob, SourceImageData.SizeY);
|
|
int32 LocalCoverage = 0;
|
|
for (int32 y = StartIndex; y < EndIndex; ++y)
|
|
{
|
|
const FLinearColor * RowPixels = &SourceImageData.Access(0,y);
|
|
|
|
for (int32 x = 0; x < SourceImageData.SizeX; ++x)
|
|
{
|
|
LocalCoverage += (RowPixels[x].A >= ThresholdScaled);
|
|
}
|
|
}
|
|
|
|
FPlatformAtomics::InterlockedAdd(&CommonResult, LocalCoverage);
|
|
});
|
|
|
|
Coverage[3] = float(CommonResult) / float(SourceImageData.SizeX * SourceImageData.SizeY);
|
|
|
|
UE_LOG(LogTextureCompressor, VeryVerbose, TEXT("Thresholds = 000 %f Coverage = 000 %f"), \
|
|
Thresholds[3], Coverage[3] );
|
|
}
|
|
else
|
|
{
|
|
FVector4f ThresholdsScaled;
|
|
|
|
for (int32 i = 0; i < 4; ++i)
|
|
{
|
|
// Skip channel if Threshold is 0
|
|
if (Thresholds[i] == 0)
|
|
{
|
|
// stuff a value that we will always be less than
|
|
ThresholdsScaled[i] = FLT_MAX;
|
|
}
|
|
else
|
|
{
|
|
check( Scales[i] != 0.f );
|
|
ThresholdsScaled[i] = DetermineScaledThreshold( Thresholds[i] , Scales[i] );
|
|
}
|
|
}
|
|
|
|
int32 CommonResults[4] = { 0, 0, 0, 0 };
|
|
ParallelFor(NumJobs, [&](int32 Index)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(ComputeAlphaCoverage.PF);
|
|
|
|
int32 StartIndex = Index * NumRowsEachJob;
|
|
int32 EndIndex = FMath::Min(StartIndex + NumRowsEachJob, SourceImageData.SizeY);
|
|
int32 LocalCoverage[4] = { 0, 0, 0, 0 };
|
|
for (int32 y = StartIndex; y < EndIndex; ++y)
|
|
{
|
|
const FLinearColor * RowPixels = &SourceImageData.Access(0,y);
|
|
|
|
for (int32 x = 0; x < SourceImageData.SizeX; ++x)
|
|
{
|
|
const FLinearColor & PixelValue = RowPixels[x];
|
|
|
|
// Calculate coverage for each channel
|
|
for (int32 i = 0; i < 4; ++i)
|
|
{
|
|
LocalCoverage[i] += ( PixelValue.Component(i) >= ThresholdsScaled[i] );
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int32 i = 0; i < 4; ++i)
|
|
{
|
|
FPlatformAtomics::InterlockedAdd(&CommonResults[i], LocalCoverage[i]);
|
|
}
|
|
});
|
|
|
|
for (int32 i = 0; i < 4; ++i)
|
|
{
|
|
Coverage[i] = float(CommonResults[i]) / float(SourceImageData.SizeX * SourceImageData.SizeY);
|
|
}
|
|
|
|
UE_LOG(LogTextureCompressor, VeryVerbose, TEXT("Thresholds = %f %f %f %f Coverage = %f %f %f %f"), \
|
|
Thresholds[0], Thresholds[1], Thresholds[2], Thresholds[3], \
|
|
Coverage[0], Coverage[1], Coverage[2], Coverage[3] );
|
|
}
|
|
|
|
return Coverage;
|
|
}
|
|
|
|
static FVector4f ComputeAlphaScale(const FVector4f& Coverages, const FVector4f& AlphaThresholds, const FImageView2D& SourceImageData)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(ComputeAlphaScale);
|
|
|
|
// This function is not a good way to do this
|
|
// but we cannot change it without changing output pixels
|
|
// A better method would be to histogram the channel and scale the histogram to meet the desired threshold
|
|
// even if using this binary search method, you should remember which value gave the closest result
|
|
// don't assume that each binary search step is an improvement
|
|
//
|
|
|
|
FVector4f MinAlphaScales (0, 0, 0, 0);
|
|
FVector4f MaxAlphaScales (4, 4, 4, 4);
|
|
FVector4f AlphaScales (1, 1, 1, 1);
|
|
|
|
//Binary Search to find Alpha Scale
|
|
// limit binary search to 8 steps
|
|
for (int32 i = 0; i < 8; ++i)
|
|
{
|
|
FVector4f ComputedCoverages = ComputeAlphaCoverage(AlphaThresholds, AlphaScales, SourceImageData);
|
|
|
|
UE_LOG(LogTextureCompressor, VeryVerbose, TEXT("Tried AlphaScale = %f ComputedCoverage = %f Goal = %f"), AlphaScales[3], ComputedCoverages[3], Coverages[3] );
|
|
|
|
for (int32 j = 0; j < 4; ++j)
|
|
{
|
|
if (AlphaThresholds[j] == 0 || fabsf(ComputedCoverages[j] - Coverages[j]) < KINDA_SMALL_NUMBER)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if (ComputedCoverages[j] < Coverages[j])
|
|
{
|
|
MinAlphaScales[j] = AlphaScales[j];
|
|
}
|
|
else if (ComputedCoverages[j] > Coverages[j])
|
|
{
|
|
MaxAlphaScales[j] = AlphaScales[j];
|
|
}
|
|
|
|
// guess alphascale is best at next midpoint :
|
|
// this means we wind up returning an alphascale value we have never tested
|
|
AlphaScales[j] = (MinAlphaScales[j] + MaxAlphaScales[j]) * 0.5f;
|
|
}
|
|
|
|
// Equals default tolerance is KINDA_SMALL_NUMBER so it checks the same condition as above
|
|
if (ComputedCoverages.Equals(Coverages))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
UE_LOG(LogTextureCompressor, VeryVerbose, TEXT("Final AlphaScales = %f %f %f %f"), AlphaScales[0], AlphaScales[1], AlphaScales[2], AlphaScales[3] );
|
|
|
|
return AlphaScales;
|
|
}
|
|
|
|
|
|
/**
|
|
* Generates a mip-map for an 2D B8G8R8A8 image using a 4x4 filter with sharpening
|
|
* @param SourceImageData - The source image's data.
|
|
* @param DestImageData - The destination image's data.
|
|
* @param ImageFormat - The format of both the source and destination images.
|
|
* @param FilterTable2D - [FilterTableSize * FilterTableSize]
|
|
* @param FilterTableSize - >= 2
|
|
* @param ScaleFactor 1 / 2:for downsampling
|
|
*/
|
|
template <EMipGenAddressMode AddressMode>
|
|
static void GenerateSharpenedMipB8G8R8A8Templ(
|
|
const FImageView2D& SourceImageData,
|
|
FImageView2D& DestImageData,
|
|
bool bDitherMipMapAlpha,
|
|
bool bDoScaleMipsForAlphaCoverage,
|
|
FVector4f AlphaCoverages,
|
|
FVector4f AlphaThresholds,
|
|
const FImageKernel2D& Kernel,
|
|
uint32 ScaleFactor,
|
|
bool bSharpenWithoutColorShift,
|
|
bool bUnfiltered)
|
|
{
|
|
check( SourceImageData.SizeX == ScaleFactor * DestImageData.SizeX || DestImageData.SizeX == 1 );
|
|
check( SourceImageData.SizeY == ScaleFactor * DestImageData.SizeY || DestImageData.SizeY == 1 );
|
|
checkf( Kernel.GetFilterTableSize() >= 2, TEXT("Kernel table size %d, expected at least 2!"), Kernel.GetFilterTableSize());
|
|
|
|
const int32 KernelCenter = (int32)Kernel.GetFilterTableSize() / 2 - 1;
|
|
|
|
// Set up a random number stream for dithering.
|
|
FRandomStream RandomStream(0);
|
|
|
|
FVector4f AlphaScale(1, 1, 1, 1);
|
|
if (bDoScaleMipsForAlphaCoverage)
|
|
{
|
|
AlphaScale = ComputeAlphaScale(AlphaCoverages, AlphaThresholds, SourceImageData);
|
|
}
|
|
|
|
int32 NumRowsEachJob;
|
|
int32 NumJobs = ImageParallelForComputeNumJobsForRows(NumRowsEachJob,DestImageData.SizeX,DestImageData.SizeY);
|
|
|
|
ParallelFor(NumJobs, [&](int32 Index)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateSharpenedMip.PF);
|
|
|
|
int32 StartIndex = Index * NumRowsEachJob;
|
|
int32 EndIndex = FMath::Min(StartIndex + NumRowsEachJob, DestImageData.SizeY);
|
|
for (int32 DestY = StartIndex; DestY < EndIndex; ++DestY)
|
|
{
|
|
for ( int32 DestX = 0;DestX < DestImageData.SizeX; DestX++ )
|
|
{
|
|
const int32 SourceX = DestX * ScaleFactor;
|
|
const int32 SourceY = DestY * ScaleFactor;
|
|
|
|
FLinearColor FilteredColor(0, 0, 0, 0);
|
|
|
|
if ( bUnfiltered )
|
|
{
|
|
FilteredColor = LookupSourceMip<AddressMode>(SourceImageData, SourceX + 0, SourceY + 0);
|
|
}
|
|
else if ( bSharpenWithoutColorShift )
|
|
{
|
|
FLinearColor SharpenedColor(0, 0, 0, 0);
|
|
|
|
for ( uint32 KernelY = 0; KernelY < Kernel.GetFilterTableSize(); ++KernelY )
|
|
{
|
|
for ( uint32 KernelX = 0; KernelX < Kernel.GetFilterTableSize(); ++KernelX )
|
|
{
|
|
float Weight = Kernel.GetAt( KernelX, KernelY );
|
|
FLinearColor Sample = LookupSourceMip<AddressMode>( SourceImageData, SourceX + KernelX - KernelCenter, SourceY + KernelY - KernelCenter );
|
|
SharpenedColor += Weight * Sample;
|
|
}
|
|
}
|
|
|
|
float NewLuminance = SharpenedColor.GetLuminance();
|
|
|
|
// simple 2x2 kernel to compute the color
|
|
FilteredColor =
|
|
( LookupSourceMip<AddressMode>( SourceImageData, SourceX + 0, SourceY + 0 )
|
|
+ LookupSourceMip<AddressMode>( SourceImageData, SourceX + 1, SourceY + 0 )
|
|
+ LookupSourceMip<AddressMode>( SourceImageData, SourceX + 0, SourceY + 1 )
|
|
+ LookupSourceMip<AddressMode>( SourceImageData, SourceX + 1, SourceY + 1 ) ) * 0.25f;
|
|
|
|
float OldLuminance = FilteredColor.GetLuminance();
|
|
|
|
if ( OldLuminance > 0.001f )
|
|
{
|
|
float Factor = NewLuminance / OldLuminance;
|
|
FilteredColor.R *= Factor;
|
|
FilteredColor.G *= Factor;
|
|
FilteredColor.B *= Factor;
|
|
}
|
|
|
|
// We also want to sharpen the alpha channel (was missing before)
|
|
FilteredColor.A = SharpenedColor.A;
|
|
}
|
|
else
|
|
{
|
|
for ( uint32 KernelY = 0; KernelY < Kernel.GetFilterTableSize(); ++KernelY )
|
|
{
|
|
for ( uint32 KernelX = 0; KernelX < Kernel.GetFilterTableSize(); ++KernelX )
|
|
{
|
|
float Weight = Kernel.GetAt( KernelX, KernelY );
|
|
FLinearColor Sample = LookupSourceMip<AddressMode>( SourceImageData, SourceX + KernelX - KernelCenter, SourceY + KernelY - KernelCenter );
|
|
FilteredColor += Weight * Sample;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Apply computed alpha scales to each channel
|
|
FilteredColor.R *= AlphaScale.X;
|
|
FilteredColor.G *= AlphaScale.Y;
|
|
FilteredColor.B *= AlphaScale.Z;
|
|
FilteredColor.A *= AlphaScale.W;
|
|
|
|
|
|
if ( bDitherMipMapAlpha )
|
|
{
|
|
// Dither the alpha of any pixel which passes an alpha threshold test.
|
|
const int32 DitherAlphaThreshold = 5.0f / 255.0f;
|
|
const float MinRandomAlpha = 85.0f;
|
|
const float MaxRandomAlpha = 255.0f;
|
|
|
|
if ( FilteredColor.A > DitherAlphaThreshold)
|
|
{
|
|
FilteredColor.A = FMath::TruncToInt( FMath::Lerp( MinRandomAlpha, MaxRandomAlpha, RandomStream.GetFraction() ) );
|
|
}
|
|
}
|
|
|
|
// Set the destination pixel.
|
|
//FLinearColor& DestColor = *(DestImageData.AsRGBA32F() + DestX + DestY * DestImageData.SizeX);
|
|
FLinearColor& DestColor = DestImageData.Access(DestX, DestY);
|
|
DestColor = FilteredColor;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
// to switch conveniently between different texture wrapping modes for the mip map generation
|
|
// the template can optimize the inner loop using a constant AddressMode
|
|
static void GenerateSharpenedMipB8G8R8A8(
|
|
const FImageView2D& SourceImageData,
|
|
const FImageView2D& SourceImageData2, // Only used with volume texture.
|
|
FImageView2D& DestImageData,
|
|
EMipGenAddressMode AddressMode,
|
|
bool bDitherMipMapAlpha,
|
|
bool bDoScaleMipsForAlphaCoverage,
|
|
FVector4f AlphaCoverages,
|
|
FVector4f AlphaThresholds,
|
|
const FImageKernel2D &Kernel,
|
|
uint32 ScaleFactor,
|
|
bool bSharpenWithoutColorShift,
|
|
bool bUnfiltered
|
|
)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateSharpenedMip);
|
|
|
|
switch(AddressMode)
|
|
{
|
|
case MGTAM_Wrap:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_Wrap>(SourceImageData, DestImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
case MGTAM_Clamp:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_Clamp>(SourceImageData, DestImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
case MGTAM_BorderBlack:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_BorderBlack>(SourceImageData, DestImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
default:
|
|
check(0);
|
|
}
|
|
|
|
// For volume texture, do the average between the 2.
|
|
if (SourceImageData2.IsValid() && !bUnfiltered)
|
|
{
|
|
FImage Temp(DestImageData.SizeX, DestImageData.SizeY, 1, ERawImageFormat::RGBA32F);
|
|
FImageView2D TempImageData (Temp, 0);
|
|
|
|
switch(AddressMode)
|
|
{
|
|
case MGTAM_Wrap:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_Wrap>(SourceImageData2, TempImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
case MGTAM_Clamp:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_Clamp>(SourceImageData2, TempImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
case MGTAM_BorderBlack:
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_BorderBlack>(SourceImageData2, TempImageData, bDitherMipMapAlpha, bDoScaleMipsForAlphaCoverage, AlphaCoverages, AlphaThresholds, Kernel, ScaleFactor, bSharpenWithoutColorShift, bUnfiltered);
|
|
break;
|
|
default:
|
|
check(0);
|
|
}
|
|
|
|
const int32 NumColors = DestImageData.SizeX * DestImageData.SizeY;
|
|
for (int32 ColorIndex = 0; ColorIndex < NumColors; ++ColorIndex)
|
|
{
|
|
DestImageData.SliceColors[ColorIndex] += TempImageData.SliceColors[ColorIndex];
|
|
DestImageData.SliceColors[ColorIndex] *= .5;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Update border texels after normal mip map generation to preserve the colors there (useful for particles and decals).
|
|
static void GenerateMipBorder(
|
|
const FImageView2D& SrcImageData,
|
|
FImageView2D& DestImageData
|
|
)
|
|
{
|
|
check( SrcImageData.SizeX == 2 * DestImageData.SizeX || DestImageData.SizeX == 1 );
|
|
check( SrcImageData.SizeY == 2 * DestImageData.SizeY || DestImageData.SizeY == 1 );
|
|
|
|
for ( int32 DestY = 0; DestY < DestImageData.SizeY; DestY++ )
|
|
{
|
|
for ( int32 DestX = 0; DestX < DestImageData.SizeX; )
|
|
{
|
|
FLinearColor FilteredColor(0, 0, 0, 0);
|
|
{
|
|
float WeightSum = 0.0f;
|
|
for ( int32 KernelY = 0; KernelY < 2; ++KernelY )
|
|
{
|
|
for ( int32 KernelX = 0; KernelX < 2; ++KernelX )
|
|
{
|
|
const int32 SourceX = DestX * 2 + KernelX;
|
|
const int32 SourceY = DestY * 2 + KernelY;
|
|
|
|
// only average the source border
|
|
if ( SourceX == 0 ||
|
|
SourceX == SrcImageData.SizeX - 1 ||
|
|
SourceY == 0 ||
|
|
SourceY == SrcImageData.SizeY - 1 )
|
|
{
|
|
FLinearColor Sample = LookupSourceMip<MGTAM_Wrap>( SrcImageData, SourceX, SourceY );
|
|
FilteredColor += Sample;
|
|
WeightSum += 1.0f;
|
|
}
|
|
}
|
|
}
|
|
FilteredColor /= WeightSum;
|
|
}
|
|
|
|
// Set the destination pixel.
|
|
//FLinearColor& DestColor = *(DestImageData.AsRGBA32F() + DestX + DestY * DestImageData.SizeX);
|
|
FLinearColor& DestColor = DestImageData.Access(DestX, DestY);
|
|
DestColor = FilteredColor;
|
|
|
|
++DestX;
|
|
|
|
if ( DestY > 0 &&
|
|
DestY < DestImageData.SizeY - 1 &&
|
|
DestX > 0 &&
|
|
DestX < DestImageData.SizeX - 1 )
|
|
{
|
|
// jump over the non border area
|
|
DestX += FMath::Max( 1, DestImageData.SizeX - 2 );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// how should be treat lookups outside of the image
|
|
static EMipGenAddressMode ComputeAdressMode(const FTextureBuildSettings& Settings)
|
|
{
|
|
EMipGenAddressMode AddressMode = MGTAM_Wrap;
|
|
|
|
if(Settings.bPreserveBorder)
|
|
{
|
|
AddressMode = Settings.bBorderColorBlack ? MGTAM_BorderBlack : MGTAM_Clamp;
|
|
}
|
|
|
|
return AddressMode;
|
|
}
|
|
|
|
static void GenerateTopMip(const FImage& SrcImage, FImage& DestImage, const FTextureBuildSettings& Settings)
|
|
{
|
|
EMipGenAddressMode AddressMode = ComputeAdressMode(Settings);
|
|
|
|
FImageKernel2D KernelDownsample;
|
|
// /2 as input resolution is same as output resolution and the settings assumed the output is half resolution
|
|
KernelDownsample.BuildSeparatableGaussWithSharpen( FMath::Max( 2u, Settings.SharpenMipKernelSize / 2 ), Settings.MipSharpening );
|
|
|
|
DestImage.Init(SrcImage.SizeX, SrcImage.SizeY, SrcImage.NumSlices, SrcImage.Format, SrcImage.GammaSpace);
|
|
|
|
for (int32 SliceIndex = 0; SliceIndex < SrcImage.NumSlices; ++SliceIndex)
|
|
{
|
|
FImageView2D SrcView((FImage&)SrcImage, SliceIndex);
|
|
FImageView2D DestView(DestImage, SliceIndex);
|
|
|
|
// generate DestImage: down sample with sharpening
|
|
GenerateSharpenedMipB8G8R8A8(
|
|
SrcView,
|
|
FImageView2D(),
|
|
DestView,
|
|
AddressMode,
|
|
Settings.bDitherMipMapAlpha,
|
|
false,
|
|
FVector4f(0, 0, 0, 0),
|
|
FVector4f(0, 0, 0, 0),
|
|
KernelDownsample,
|
|
1,
|
|
Settings.bSharpenWithoutColorShift,
|
|
Settings.MipGenSettings == TMGS_Unfiltered);
|
|
}
|
|
}
|
|
|
|
static FLinearColor LookupSourceMipBilinear(const FImageView2D& SourceImageData, float X, float Y)
|
|
{
|
|
X = FMath::Clamp(X, 0.f, SourceImageData.SizeX - 1.f);
|
|
Y = FMath::Clamp(Y, 0.f, SourceImageData.SizeY - 1.f);
|
|
int32 IntX0 = FMath::FloorToInt(X);
|
|
int32 IntY0 = FMath::FloorToInt(Y);
|
|
float FractX = X - IntX0;
|
|
float FractY = Y - IntY0;
|
|
int32 IntX1 = FMath::Min(IntX0+1, SourceImageData.SizeX-1);
|
|
int32 IntY1 = FMath::Min(IntY0+1, SourceImageData.SizeY-1);
|
|
|
|
FLinearColor Sample00 = SourceImageData.Access(IntX0,IntY0);
|
|
FLinearColor Sample10 = SourceImageData.Access(IntX1,IntY0);
|
|
FLinearColor Sample01 = SourceImageData.Access(IntX0,IntY1);
|
|
FLinearColor Sample11 = SourceImageData.Access(IntX1,IntY1);
|
|
FLinearColor Sample0 = FMath::Lerp(Sample00, Sample10, FractX);
|
|
FLinearColor Sample1 = FMath::Lerp(Sample01, Sample11, FractX);
|
|
|
|
return FMath::Lerp(Sample0, Sample1, FractY);
|
|
}
|
|
|
|
struct FTextureDownscaleSettings
|
|
{
|
|
int32 BlockSize;
|
|
float Downscale;
|
|
uint8 DownscaleOptions;
|
|
bool bDitherMipMapAlpha;
|
|
};
|
|
|
|
static void DownscaleImage(const FImage& SrcImage, FImage& DstImage, const FTextureDownscaleSettings& Settings)
|
|
{
|
|
if (Settings.Downscale <= 1.f)
|
|
{
|
|
return;
|
|
}
|
|
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(DownscaleImage);
|
|
|
|
float Downscale = FMath::Clamp(Settings.Downscale, 1.f, 8.f);
|
|
int32 FinalSizeX = FMath::CeilToInt(SrcImage.SizeX / Downscale);
|
|
int32 FinalSizeY = FMath::CeilToInt(SrcImage.SizeY / Downscale);
|
|
|
|
// compute final size respecting image block size
|
|
if (Settings.BlockSize > 1
|
|
&& SrcImage.SizeX % Settings.BlockSize == 0
|
|
&& SrcImage.SizeY % Settings.BlockSize == 0)
|
|
{
|
|
int32 NumBlocksX = SrcImage.SizeX / Settings.BlockSize;
|
|
int32 NumBlocksY = SrcImage.SizeY / Settings.BlockSize;
|
|
int32 GCD = FMath::GreatestCommonDivisor(NumBlocksX, NumBlocksY);
|
|
int32 RatioX = NumBlocksX/GCD;
|
|
int32 RatioY = NumBlocksY/GCD;
|
|
int32 FinalNumBlocksX = (int32)FMath::GridSnap((float)FinalSizeX/Settings.BlockSize, (float)RatioX);
|
|
int32 FinalNumBlocksY = FinalNumBlocksX/RatioX*RatioY;
|
|
FinalSizeX = FinalNumBlocksX*Settings.BlockSize;
|
|
FinalSizeY = FinalNumBlocksY*Settings.BlockSize;
|
|
}
|
|
|
|
Downscale = (float)SrcImage.SizeX / FinalSizeX;
|
|
|
|
FImage Image0;
|
|
FImage Image1;
|
|
FImage* ImageChain[2] = {&const_cast<FImage&>(SrcImage), &Image1};
|
|
bool bUnfiltered = Settings.DownscaleOptions == (uint8)ETextureDownscaleOptions::Unfiltered;
|
|
|
|
// Scaledown using 2x2 average, use user specified filtering only for last iteration
|
|
FImageKernel2D AvgKernel;
|
|
AvgKernel.BuildSeparatableGaussWithSharpen(2);
|
|
int32 NumIterations = 0;
|
|
while(Downscale > 2.0f)
|
|
{
|
|
int32 DstSizeX = ImageChain[0]->SizeX / 2;
|
|
int32 DstSizeY = ImageChain[0]->SizeY / 2;
|
|
ImageChain[1]->Init(DstSizeX, DstSizeY, ImageChain[0]->NumSlices, ImageChain[0]->Format, ImageChain[0]->GammaSpace);
|
|
|
|
FImageView2D SrcImageData(*ImageChain[0], 0);
|
|
FImageView2D DstImageData(*ImageChain[1], 0);
|
|
GenerateSharpenedMipB8G8R8A8Templ<MGTAM_Clamp>(
|
|
SrcImageData,
|
|
DstImageData,
|
|
Settings.bDitherMipMapAlpha,
|
|
false,
|
|
FVector4f(0, 0, 0, 0),
|
|
FVector4f(0, 0, 0, 0),
|
|
AvgKernel,
|
|
2,
|
|
false,
|
|
bUnfiltered);
|
|
|
|
if (NumIterations == 0)
|
|
{
|
|
ImageChain[0] = &Image0;
|
|
}
|
|
Swap(ImageChain[0], ImageChain[1]);
|
|
|
|
NumIterations++;
|
|
Downscale/= 2.f;
|
|
}
|
|
|
|
if (ImageChain[0]->SizeX == FinalSizeX &&
|
|
ImageChain[0]->SizeY == FinalSizeY)
|
|
{
|
|
ImageChain[0]->CopyTo(DstImage, ImageChain[0]->Format, ImageChain[0]->GammaSpace);
|
|
return;
|
|
}
|
|
|
|
int32 KernelSize = 2;
|
|
float Sharpening = 0.0f;
|
|
if (Settings.DownscaleOptions >= (uint8)ETextureDownscaleOptions::Sharpen0 && Settings.DownscaleOptions <= (uint8)ETextureDownscaleOptions::Sharpen10)
|
|
{
|
|
// 0 .. 2.0f
|
|
Sharpening = ((int32)Settings.DownscaleOptions - (int32)ETextureDownscaleOptions::Sharpen0) * 0.2f;
|
|
KernelSize = 8;
|
|
}
|
|
|
|
bool bBilinear = Settings.DownscaleOptions == (uint8)ETextureDownscaleOptions::SimpleAverage;
|
|
|
|
FImageKernel2D KernelSharpen;
|
|
KernelSharpen.BuildSeparatableGaussWithSharpen(KernelSize, Sharpening);
|
|
const int32 KernelCenter = (int32)KernelSharpen.GetFilterTableSize() / 2 - 1;
|
|
|
|
ImageChain[1] = &DstImage;
|
|
if (ImageChain[0] == ImageChain[1])
|
|
{
|
|
ImageChain[0]->CopyTo(Image0, ImageChain[0]->Format, ImageChain[0]->GammaSpace);
|
|
ImageChain[0] = &Image0;
|
|
}
|
|
|
|
// Set up a random number stream for dithering.
|
|
FRandomStream RandomStream(0);
|
|
ImageChain[1]->Init(FinalSizeX, FinalSizeY, ImageChain[0]->NumSlices, ImageChain[0]->Format, ImageChain[0]->GammaSpace);
|
|
Downscale = (float)ImageChain[0]->SizeX / FinalSizeX;
|
|
|
|
FImageView2D SrcImageData(*ImageChain[0], 0);
|
|
FImageView2D DstImageData(*ImageChain[1], 0);
|
|
|
|
for (int32 Y = 0; Y < FinalSizeY; ++Y)
|
|
{
|
|
float SourceY = Y * Downscale;
|
|
int32 IntSourceY = FMath::RoundToInt(SourceY);
|
|
|
|
for (int32 X = 0; X < FinalSizeX; ++X)
|
|
{
|
|
float SourceX = X * Downscale;
|
|
int32 IntSourceX = FMath::RoundToInt(SourceX);
|
|
|
|
FLinearColor FilteredColor(0,0,0,0);
|
|
|
|
if (bUnfiltered)
|
|
{
|
|
FilteredColor = LookupSourceMip<MGTAM_Clamp>(SrcImageData, IntSourceX, IntSourceY);
|
|
}
|
|
else if(bBilinear)
|
|
{
|
|
FilteredColor = LookupSourceMipBilinear(SrcImageData, SourceX, SourceY);
|
|
}
|
|
else
|
|
{
|
|
for (uint32 KernelY = 0; KernelY < KernelSharpen.GetFilterTableSize(); ++KernelY)
|
|
{
|
|
for (uint32 KernelX = 0; KernelX < KernelSharpen.GetFilterTableSize(); ++KernelX)
|
|
{
|
|
float Weight = KernelSharpen.GetAt(KernelX, KernelY);
|
|
FLinearColor Sample = LookupSourceMipBilinear(SrcImageData, SourceX + KernelX - KernelCenter, SourceY + KernelY - KernelCenter);
|
|
FilteredColor += Weight * Sample;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Settings.bDitherMipMapAlpha)
|
|
{
|
|
// Dither the alpha of any pixel which passes an alpha threshold test.
|
|
const int32 DitherAlphaThreshold = 5.0f / 255.0f;
|
|
const float MinRandomAlpha = 85.0f;
|
|
const float MaxRandomAlpha = 255.0f;
|
|
|
|
if (FilteredColor.A > DitherAlphaThreshold)
|
|
{
|
|
FilteredColor.A = FMath::TruncToInt(FMath::Lerp(MinRandomAlpha, MaxRandomAlpha, RandomStream.GetFraction()));
|
|
}
|
|
}
|
|
|
|
// Set the destination pixel.
|
|
FLinearColor& DestColor = DstImageData.Access(X, Y);
|
|
DestColor = FilteredColor;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ITextureCompressorModule::GenerateMipChain(
|
|
const FTextureBuildSettings& Settings,
|
|
const FImage& BaseImage,
|
|
TArray<FImage> &OutMipChain,
|
|
uint32 MipChainDepth
|
|
)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateMipChain);
|
|
|
|
check(BaseImage.Format == ERawImageFormat::RGBA32F);
|
|
|
|
const FImage& BaseMip = BaseImage;
|
|
const int32 SrcWidth = BaseMip.SizeX;
|
|
const int32 SrcHeight= BaseMip.SizeY;
|
|
const int32 SrcNumSlices = BaseMip.NumSlices;
|
|
const ERawImageFormat::Type ImageFormat = ERawImageFormat::RGBA32F;
|
|
|
|
FVector4f AlphaCoverages(0, 0, 0, 0);
|
|
|
|
|
|
const FImage* IntermediateSrcPtr;
|
|
FImage* IntermediateDstPtr;
|
|
|
|
// This will be used as a buffer for the mip processing
|
|
FImage FirstTempImage;
|
|
|
|
if (BaseMip.GammaSpace != EGammaSpace::Linear)
|
|
{
|
|
// copy base mip
|
|
BaseMip.CopyTo(FirstTempImage, ERawImageFormat::RGBA32F, EGammaSpace::Linear);
|
|
|
|
IntermediateSrcPtr = &FirstTempImage;
|
|
}
|
|
else
|
|
{
|
|
// It looks like the BaseMip can be reused for the intermediate source of the second Mip (assuming that the format was check earlier to be RGBA32F)
|
|
IntermediateSrcPtr = &BaseMip;
|
|
|
|
// This temp image will be first used as an intermediate destination for the third mip in the chain
|
|
FirstTempImage.Init( FMath::Max<uint32>( 1, SrcWidth >> 2 ), FMath::Max<uint32>( 1, SrcHeight >> 2 ), Settings.bVolume ? FMath::Max<uint32>( 1, SrcNumSlices >> 2 ) : SrcNumSlices, ImageFormat );
|
|
}
|
|
|
|
// The image for the first destination
|
|
FImage SecondTempImage(FMath::Max<uint32>( 1, SrcWidth >> 1 ), FMath::Max<uint32>( 1, SrcHeight >> 1 ), Settings.bVolume ? FMath::Max<uint32>( 1, SrcNumSlices >> 1 ) : SrcNumSlices, ImageFormat);
|
|
IntermediateDstPtr = &SecondTempImage;
|
|
|
|
// Filtering kernels.
|
|
FImageKernel2D KernelSimpleAverage;
|
|
FImageKernel2D KernelDownsample;
|
|
KernelSimpleAverage.BuildSeparatableGaussWithSharpen( 2 );
|
|
KernelDownsample.BuildSeparatableGaussWithSharpen( Settings.SharpenMipKernelSize, Settings.MipSharpening );
|
|
|
|
//@TODO : add a true 3D kernel.
|
|
|
|
EMipGenAddressMode AddressMode = ComputeAdressMode(Settings);
|
|
bool bReDrawBorder = false;
|
|
if( Settings.bPreserveBorder )
|
|
{
|
|
bReDrawBorder = !Settings.bBorderColorBlack;
|
|
}
|
|
|
|
// Calculate alpha coverage value to preserve along mip chain
|
|
if ( Settings.bDoScaleMipsForAlphaCoverage )
|
|
{
|
|
check(Settings.AlphaCoverageThresholds != FVector4f(0,0,0,0));
|
|
check(IntermediateSrcPtr);
|
|
const FImageView2D IntermediateSrcView = FImageView2D::ConstructConst(*IntermediateSrcPtr, 0);
|
|
|
|
const FVector4f AlphaScales(1, 1, 1, 1);
|
|
AlphaCoverages = ComputeAlphaCoverage(Settings.AlphaCoverageThresholds, AlphaScales, IntermediateSrcView);
|
|
}
|
|
|
|
// Generate mips
|
|
// default value of MipChainDepth is MAX_uint32, means generate all mips down to 1x1
|
|
// (break inside the loop)
|
|
for (; MipChainDepth != 0 ; --MipChainDepth)
|
|
{
|
|
check(IntermediateSrcPtr && IntermediateDstPtr);
|
|
const FImage& IntermediateSrc = *IntermediateSrcPtr;
|
|
FImage& IntermediateDst = *IntermediateDstPtr;
|
|
|
|
// add new mip to TArray<FImage> &OutMipChain :
|
|
// placement new on TArray does AddUninitialized then constructs in the last element
|
|
FImage& DestImage = *new(OutMipChain) FImage(IntermediateDst.SizeX, IntermediateDst.SizeY, IntermediateDst.NumSlices, ImageFormat);
|
|
|
|
for (int32 SliceIndex = 0; SliceIndex < IntermediateDst.NumSlices; ++SliceIndex)
|
|
{
|
|
const int32 SrcSliceIndex = Settings.bVolume ? (SliceIndex * 2) : SliceIndex;
|
|
const FImageView2D IntermediateSrcView = FImageView2D::ConstructConst(IntermediateSrc, SrcSliceIndex);
|
|
const FImageView2D IntermediateSrcView2 = Settings.bVolume ? FImageView2D::ConstructConst(IntermediateSrc, SrcSliceIndex + 1) : FImageView2D(); // Volume texture mips take 2 slices
|
|
FImageView2D DestView(DestImage, SliceIndex);
|
|
FImageView2D IntermediateDstView(IntermediateDst, SliceIndex);
|
|
|
|
GenerateSharpenedMipB8G8R8A8(
|
|
IntermediateSrcView,
|
|
IntermediateSrcView2,
|
|
DestView,
|
|
AddressMode,
|
|
Settings.bDitherMipMapAlpha,
|
|
Settings.bDoScaleMipsForAlphaCoverage,
|
|
AlphaCoverages,
|
|
Settings.AlphaCoverageThresholds,
|
|
KernelDownsample,
|
|
2,
|
|
Settings.bSharpenWithoutColorShift,
|
|
Settings.MipGenSettings == TMGS_Unfiltered);
|
|
|
|
// generate IntermediateDstImage:
|
|
if ( Settings.bDownsampleWithAverage )
|
|
{
|
|
// down sample without sharpening for the next iteration
|
|
GenerateSharpenedMipB8G8R8A8(
|
|
IntermediateSrcView,
|
|
IntermediateSrcView2,
|
|
IntermediateDstView,
|
|
AddressMode,
|
|
Settings.bDitherMipMapAlpha,
|
|
Settings.bDoScaleMipsForAlphaCoverage,
|
|
AlphaCoverages,
|
|
Settings.AlphaCoverageThresholds,
|
|
KernelSimpleAverage,
|
|
2,
|
|
Settings.bSharpenWithoutColorShift,
|
|
Settings.MipGenSettings == TMGS_Unfiltered);
|
|
}
|
|
}
|
|
|
|
if ( Settings.bDownsampleWithAverage == false )
|
|
{
|
|
FMemory::Memcpy( (&IntermediateDst.AsRGBA32F()[0]), (&DestImage.AsRGBA32F()[0]),
|
|
IntermediateDst.SizeX * IntermediateDst.SizeY * IntermediateDst.NumSlices * sizeof(FLinearColor) );
|
|
}
|
|
|
|
if ( bReDrawBorder )
|
|
{
|
|
for (int32 SliceIndex = 0; SliceIndex < IntermediateDst.NumSlices; ++SliceIndex)
|
|
{
|
|
const FImageView2D IntermediateSrcView = FImageView2D::ConstructConst(IntermediateSrc, SliceIndex);
|
|
FImageView2D DestView(DestImage, SliceIndex);
|
|
FImageView2D IntermediateDstView(IntermediateDst, SliceIndex);
|
|
GenerateMipBorder( IntermediateSrcView, DestView );
|
|
GenerateMipBorder( IntermediateSrcView, IntermediateDstView );
|
|
}
|
|
}
|
|
|
|
// Once we've created mip-maps down to 1x1, we're done.
|
|
if ( IntermediateDst.SizeX == 1 && IntermediateDst.SizeY == 1 && (!Settings.bVolume || IntermediateDst.NumSlices == 1))
|
|
{
|
|
break;
|
|
}
|
|
|
|
// last destination becomes next source
|
|
if (IntermediateDstPtr == &SecondTempImage)
|
|
{
|
|
IntermediateDstPtr = &FirstTempImage;
|
|
IntermediateSrcPtr = &SecondTempImage;
|
|
}
|
|
else
|
|
{
|
|
IntermediateDstPtr = &SecondTempImage;
|
|
IntermediateSrcPtr = &FirstTempImage;
|
|
}
|
|
|
|
// Update the destination size for the next iteration.
|
|
IntermediateDstPtr->SizeX = FMath::Max<uint32>( 1, IntermediateSrcPtr->SizeX >> 1 );
|
|
IntermediateDstPtr->SizeY = FMath::Max<uint32>( 1, IntermediateSrcPtr->SizeY >> 1 );
|
|
IntermediateDstPtr->NumSlices = Settings.bVolume ? FMath::Max<uint32>( 1, IntermediateSrcPtr->NumSlices >> 1 ) : SrcNumSlices;
|
|
}
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
Angular Filtering for HDR Cubemaps.
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* View in to an image that allows access by converting a direction to longitude and latitude.
|
|
*/
|
|
struct FImageViewLongLat
|
|
{
|
|
/** Image colors. */
|
|
FLinearColor* ImageColors;
|
|
/** Width of the image. */
|
|
int32 SizeX;
|
|
/** Height of the image. */
|
|
int32 SizeY;
|
|
|
|
/** Initialization constructor. */
|
|
explicit FImageViewLongLat(FImage& Image, int32 SliceIndex)
|
|
{
|
|
SizeX = Image.SizeX;
|
|
SizeY = Image.SizeY;
|
|
ImageColors = (&Image.AsRGBA32F()[0]) + SliceIndex * SizeY * SizeX;
|
|
}
|
|
|
|
/** Wraps X around W. */
|
|
static void WrapTo(int32& X, int32 W)
|
|
{
|
|
X = X % W;
|
|
|
|
if(X < 0)
|
|
{
|
|
X += W;
|
|
}
|
|
}
|
|
|
|
/** Const access to a texel. */
|
|
FLinearColor Access(int32 X, int32 Y) const
|
|
{
|
|
return ImageColors[X + Y * SizeX];
|
|
}
|
|
|
|
/** Makes a filtered lookup. */
|
|
FLinearColor LookupFiltered(float X, float Y) const
|
|
{
|
|
int32 X0 = (int32)floor(X);
|
|
int32 Y0 = (int32)floor(Y);
|
|
|
|
float FracX = X - X0;
|
|
float FracY = Y - Y0;
|
|
|
|
int32 X1 = X0 + 1;
|
|
int32 Y1 = Y0 + 1;
|
|
|
|
WrapTo(X0, SizeX);
|
|
WrapTo(X1, SizeX);
|
|
Y0 = FMath::Clamp(Y0, 0, (int32)(SizeY - 1));
|
|
Y1 = FMath::Clamp(Y1, 0, (int32)(SizeY - 1));
|
|
|
|
FLinearColor CornerRGB00 = Access(X0, Y0);
|
|
FLinearColor CornerRGB10 = Access(X1, Y0);
|
|
FLinearColor CornerRGB01 = Access(X0, Y1);
|
|
FLinearColor CornerRGB11 = Access(X1, Y1);
|
|
|
|
FLinearColor CornerRGB0 = FMath::Lerp(CornerRGB00, CornerRGB10, FracX);
|
|
FLinearColor CornerRGB1 = FMath::Lerp(CornerRGB01, CornerRGB11, FracX);
|
|
|
|
return FMath::Lerp(CornerRGB0, CornerRGB1, FracY);
|
|
}
|
|
|
|
/** Makes a filtered lookup using a direction. */
|
|
FLinearColor LookupLongLat(FVector NormalizedDirection) const
|
|
{
|
|
// see http://gl.ict.usc.edu/Data/HighResProbes
|
|
// latitude-longitude panoramic format = equirectangular mapping
|
|
|
|
float X = (1 + atan2(NormalizedDirection.X, - NormalizedDirection.Z) / PI) / 2 * SizeX;
|
|
float Y = acos(NormalizedDirection.Y) / PI * SizeY;
|
|
|
|
return LookupFiltered(X, Y);
|
|
}
|
|
};
|
|
|
|
// transform world space vector to a space relative to the face
|
|
static FVector TransformSideToWorldSpace(uint32 CubemapFace, FVector InDirection)
|
|
{
|
|
float x = InDirection.X, y = InDirection.Y, z = InDirection.Z;
|
|
|
|
FVector Ret = FVector(0, 0, 0);
|
|
|
|
// see http://msdn.microsoft.com/en-us/library/bb204881(v=vs.85).aspx
|
|
switch(CubemapFace)
|
|
{
|
|
case 0: Ret = FVector(+z, -y, -x); break;
|
|
case 1: Ret = FVector(-z, -y, +x); break;
|
|
case 2: Ret = FVector(+x, +z, +y); break;
|
|
case 3: Ret = FVector(+x, -z, -y); break;
|
|
case 4: Ret = FVector(+x, -y, +z); break;
|
|
case 5: Ret = FVector(-x, -y, -z); break;
|
|
default:
|
|
checkSlow(0);
|
|
}
|
|
|
|
// this makes it with the Unreal way (z and y are flipped)
|
|
return FVector(Ret.X, Ret.Z, Ret.Y);
|
|
}
|
|
|
|
// transform vector relative to the face to world space
|
|
static FVector TransformWorldToSideSpace(uint32 CubemapFace, FVector InDirection)
|
|
{
|
|
// undo Unreal way (z and y are flipped)
|
|
float x = InDirection.X, y = InDirection.Z, z = InDirection.Y;
|
|
|
|
FVector Ret = FVector(0, 0, 0);
|
|
|
|
// see http://msdn.microsoft.com/en-us/library/bb204881(v=vs.85).aspx
|
|
switch(CubemapFace)
|
|
{
|
|
case 0: Ret = FVector(-z, -y, +x); break;
|
|
case 1: Ret = FVector(+z, -y, -x); break;
|
|
case 2: Ret = FVector(+x, +z, +y); break;
|
|
case 3: Ret = FVector(+x, -z, -y); break;
|
|
case 4: Ret = FVector(+x, -y, +z); break;
|
|
case 5: Ret = FVector(-x, -y, -z); break;
|
|
default:
|
|
checkSlow(0);
|
|
}
|
|
|
|
return Ret;
|
|
}
|
|
|
|
FVector ComputeSSCubeDirectionAtTexelCenter(uint32 x, uint32 y, float InvSideExtent)
|
|
{
|
|
// center of the texels
|
|
FVector DirectionSS((x + 0.5f) * InvSideExtent * 2 - 1, (y + 0.5f) * InvSideExtent * 2 - 1, 1);
|
|
DirectionSS.Normalize();
|
|
return DirectionSS;
|
|
}
|
|
|
|
static FVector ComputeWSCubeDirectionAtTexelCenter(uint32 CubemapFace, uint32 x, uint32 y, float InvSideExtent)
|
|
{
|
|
FVector DirectionSS = ComputeSSCubeDirectionAtTexelCenter(x, y, InvSideExtent);
|
|
FVector DirectionWS = TransformSideToWorldSpace(CubemapFace, DirectionSS);
|
|
return DirectionWS;
|
|
}
|
|
|
|
static uint32 ComputeLongLatCubemapExtents(const FImage& SrcImage, const uint32 MaxCubemapTextureResolution)
|
|
{
|
|
return FMath::Clamp(1U << FMath::FloorLog2(SrcImage.SizeX / 2), 32U, MaxCubemapTextureResolution);
|
|
}
|
|
|
|
void ITextureCompressorModule::GenerateBaseCubeMipFromLongitudeLatitude2D(FImage* OutMip, const FImage& SrcImage, const uint32 MaxCubemapTextureResolution, uint8 SourceEncodingOverride)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateBaseCubeMipFromLongitudeLatitude2D);
|
|
|
|
FImage LongLatImage;
|
|
SrcImage.Linearize(SourceEncodingOverride, LongLatImage);
|
|
|
|
// TODO_TEXTURE: Expose target size to user.
|
|
uint32 Extent = ComputeLongLatCubemapExtents(LongLatImage, MaxCubemapTextureResolution);
|
|
float InvExtent = 1.0f / Extent;
|
|
OutMip->Init(Extent, Extent, SrcImage.NumSlices * 6, ERawImageFormat::RGBA32F, EGammaSpace::Linear);
|
|
|
|
for (int32 Slice = 0; Slice < SrcImage.NumSlices; ++Slice)
|
|
{
|
|
FImageViewLongLat LongLatView(LongLatImage, Slice);
|
|
for (uint32 Face = 0; Face < 6; ++Face)
|
|
{
|
|
FImageView2D MipView(*OutMip, Slice * 6 + Face);
|
|
for (uint32 y = 0; y < Extent; ++y)
|
|
{
|
|
for (uint32 x = 0; x < Extent; ++x)
|
|
{
|
|
FVector DirectionWS = ComputeWSCubeDirectionAtTexelCenter(Face, x, y, InvExtent);
|
|
MipView.Access(x, y) = LongLatView.LookupLongLat(DirectionWS);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
class FTexelProcessor
|
|
{
|
|
public:
|
|
// @param InConeAxisSS - normalized, in side space
|
|
// @param TexelAreaArray - precomputed area of each texel for correct weighting
|
|
FTexelProcessor(const FVector& InConeAxisSS, float ConeAngle, const FLinearColor* InSideData, const float* InTexelAreaArray, uint32 InFullExtent)
|
|
: ConeAxisSS(InConeAxisSS)
|
|
, AccumulatedColor(0, 0, 0, 0)
|
|
, SideData(InSideData)
|
|
, TexelAreaArray(InTexelAreaArray)
|
|
, FullExtent(InFullExtent)
|
|
{
|
|
ConeAngleSin = sinf(ConeAngle);
|
|
ConeAngleCos = cosf(ConeAngle);
|
|
|
|
// *2 as the position is from -1 to 1
|
|
// / InFullExtent as x and y is in the range 0..InFullExtent-1
|
|
PositionToWorldScale = 2.0f / InFullExtent;
|
|
InvFullExtent = 1.0f / FullExtent;
|
|
|
|
// examples: 0 to diffuse convolution, 0.95f for glossy
|
|
DirDot = FMath::Min(FMath::Cos(ConeAngle), 0.9999f);
|
|
|
|
InvDirOneMinusDot = 1.0f / (1.0f - DirDot);
|
|
|
|
// precomputed sqrt(2.0f * 2.0f + 2.0f * 2.0f)
|
|
float Sqrt8 = 2.8284271f;
|
|
RadiusToWorldScale = Sqrt8 / (float)InFullExtent;
|
|
}
|
|
|
|
// @return true: yes, traverse deeper, false: not relevant
|
|
bool TestIfRelevant(uint32 x, uint32 y, uint32 LocalExtent) const
|
|
{
|
|
float HalfExtent = LocalExtent * 0.5f;
|
|
float U = (x + HalfExtent) * PositionToWorldScale - 1.0f;
|
|
float V = (y + HalfExtent) * PositionToWorldScale - 1.0f;
|
|
|
|
float SphereRadius = RadiusToWorldScale * LocalExtent;
|
|
|
|
FVector SpherePos(U, V, 1);
|
|
|
|
return FMath::SphereConeIntersection(SpherePos, SphereRadius, ConeAxisSS, ConeAngleSin, ConeAngleCos);
|
|
}
|
|
|
|
void Process(uint32 x, uint32 y)
|
|
{
|
|
const FLinearColor* In = &SideData[x + y * FullExtent];
|
|
|
|
FVector DirectionSS = ComputeSSCubeDirectionAtTexelCenter(x, y, InvFullExtent);
|
|
|
|
float DotValue = ConeAxisSS | DirectionSS;
|
|
|
|
if(DotValue > DirDot)
|
|
{
|
|
// 0..1, 0=at kernel border..1=at kernel center
|
|
float KernelWeight = 1.0f - (1.0f - DotValue) * InvDirOneMinusDot;
|
|
|
|
// apply smoothstep function (softer, less linear result)
|
|
KernelWeight = KernelWeight * KernelWeight * (3 - 2 * KernelWeight);
|
|
|
|
float AreaCompensation = TexelAreaArray[x + y * FullExtent];
|
|
// AreaCompensation would be need for correctness but seems it has a but
|
|
// as it looks much better (no seam) without, the effect is minor so it's deactivated for now.
|
|
// float Weight = KernelWeight * AreaCompensation;
|
|
float Weight = KernelWeight;
|
|
|
|
AccumulatedColor.R += Weight * In->R;
|
|
AccumulatedColor.G += Weight * In->G;
|
|
AccumulatedColor.B += Weight * In->B;
|
|
AccumulatedColor.A += Weight;
|
|
}
|
|
}
|
|
|
|
// normalized, in side space
|
|
FVector ConeAxisSS;
|
|
|
|
FLinearColor AccumulatedColor;
|
|
|
|
// cached for better performance
|
|
float ConeAngleSin;
|
|
float ConeAngleCos;
|
|
float PositionToWorldScale;
|
|
float RadiusToWorldScale;
|
|
float InvFullExtent;
|
|
// 0 to diffuse convolution, 0.95f for glossy
|
|
float DirDot;
|
|
float InvDirOneMinusDot;
|
|
|
|
/** [x + y * FullExtent] */
|
|
const FLinearColor* SideData;
|
|
const float* TexelAreaArray;
|
|
uint32 FullExtent;
|
|
};
|
|
|
|
template <class TVisitor>
|
|
void TCubemapSideRasterizer(TVisitor &TexelProcessor, int32 x, uint32 y, uint32 Extent)
|
|
{
|
|
if(Extent > 1)
|
|
{
|
|
if(!TexelProcessor.TestIfRelevant(x, y, Extent))
|
|
{
|
|
return;
|
|
}
|
|
Extent /= 2;
|
|
|
|
TCubemapSideRasterizer(TexelProcessor, x, y, Extent);
|
|
TCubemapSideRasterizer(TexelProcessor, x + Extent, y, Extent);
|
|
TCubemapSideRasterizer(TexelProcessor, x, y + Extent, Extent);
|
|
TCubemapSideRasterizer(TexelProcessor, x + Extent, y + Extent, Extent);
|
|
}
|
|
else
|
|
{
|
|
TexelProcessor.Process(x, y);
|
|
}
|
|
}
|
|
|
|
static FLinearColor IntegrateAngularArea(FImage& Image, FVector FilterDirectionWS, float ConeAngle, const float* TexelAreaArray)
|
|
{
|
|
// Alpha channel is used to renormalize later
|
|
FLinearColor ret(0, 0, 0, 0);
|
|
int32 Extent = Image.SizeX;
|
|
|
|
for(uint32 Face = 0; Face < 6; ++Face)
|
|
{
|
|
FImageView2D ImageView(Image, Face);
|
|
FVector FilterDirectionSS = TransformWorldToSideSpace(Face, FilterDirectionWS);
|
|
FTexelProcessor Processor(FilterDirectionSS, ConeAngle, &ImageView.Access(0,0), TexelAreaArray, Extent);
|
|
|
|
// recursively split the (0,0)-(Extent-1,Extent-1), tests for intersection and processes only colors inside
|
|
TCubemapSideRasterizer(Processor, 0, 0, Extent);
|
|
ret += Processor.AccumulatedColor;
|
|
}
|
|
|
|
if(ret.A != 0)
|
|
{
|
|
float Inv = 1.0f / ret.A;
|
|
|
|
ret.R *= Inv;
|
|
ret.G *= Inv;
|
|
ret.B *= Inv;
|
|
}
|
|
else
|
|
{
|
|
// should not happen
|
|
// checkSlow(0);
|
|
}
|
|
|
|
ret.A = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
// @return 2 * computed triangle area
|
|
static inline float TriangleArea2_3D(FVector A, FVector B, FVector C)
|
|
{
|
|
return ((A-B) ^ (C-B)).Size();
|
|
}
|
|
|
|
static inline float ComputeTexelArea(uint32 x, uint32 y, float InvSideExtentMul2)
|
|
{
|
|
float fU = x * InvSideExtentMul2 - 1;
|
|
float fV = y * InvSideExtentMul2 - 1;
|
|
|
|
FVector CornerA = FVector(fU, fV, 1);
|
|
FVector CornerB = FVector(fU + InvSideExtentMul2, fV, 1);
|
|
FVector CornerC = FVector(fU, fV + InvSideExtentMul2, 1);
|
|
FVector CornerD = FVector(fU + InvSideExtentMul2, fV + InvSideExtentMul2, 1);
|
|
|
|
CornerA.Normalize();
|
|
CornerB.Normalize();
|
|
CornerC.Normalize();
|
|
CornerD.Normalize();
|
|
|
|
return TriangleArea2_3D(CornerA, CornerB, CornerC) + TriangleArea2_3D(CornerC, CornerB, CornerD) * 0.5f;
|
|
}
|
|
|
|
/**
|
|
* Generate a mip using angular filtering.
|
|
* @param DestMip - The filtered mip.
|
|
* @param SrcMip - The source mip which will be filtered.
|
|
* @param ConeAngle - The cone angle with which to filter.
|
|
*/
|
|
static void GenerateAngularFilteredMip(FImage* DestMip, FImage& SrcMip, float ConeAngle)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateAngularFilteredMip);
|
|
|
|
int32 MipExtent = DestMip->SizeX;
|
|
float MipInvSideExtent = 1.0f / MipExtent;
|
|
|
|
TArray<float> TexelAreaArray;
|
|
TexelAreaArray.AddUninitialized(SrcMip.SizeX * SrcMip.SizeY);
|
|
|
|
// precompute the area size for one face (is the same for each face)
|
|
for(int32 y = 0; y < SrcMip.SizeY; ++y)
|
|
{
|
|
for(int32 x = 0; x < SrcMip.SizeX; ++x)
|
|
{
|
|
TexelAreaArray[x + y * SrcMip.SizeX] = ComputeTexelArea(x, y, MipInvSideExtent * 2);
|
|
}
|
|
}
|
|
|
|
// We start getting gains running threaded upwards of sizes >= 128
|
|
if (SrcMip.SizeX >= 128)
|
|
{
|
|
// Quick workaround: Do a thread per mip
|
|
struct FAsyncGenerateMipsPerFaceWorker : public FNonAbandonableTask
|
|
{
|
|
int32 Face;
|
|
FImage* DestMip;
|
|
int32 Extent;
|
|
float ConeAngle;
|
|
const float* TexelAreaArray;
|
|
FImage* SrcMip;
|
|
FAsyncGenerateMipsPerFaceWorker(int32 InFace, FImage* InDestMip, int32 InExtent, float InConeAngle, const float* InTexelAreaArray, FImage* InSrcMip) :
|
|
Face(InFace),
|
|
DestMip(InDestMip),
|
|
Extent(InExtent),
|
|
ConeAngle(InConeAngle),
|
|
TexelAreaArray(InTexelAreaArray),
|
|
SrcMip(InSrcMip)
|
|
{
|
|
}
|
|
|
|
void DoWork()
|
|
{
|
|
const float InvSideExtent = 1.0f / Extent;
|
|
FImageView2D DestMipView(*DestMip, Face);
|
|
for (int32 y = 0; y < Extent; ++y)
|
|
{
|
|
for (int32 x = 0; x < Extent; ++x)
|
|
{
|
|
FVector DirectionWS = ComputeWSCubeDirectionAtTexelCenter(Face, x, y, InvSideExtent);
|
|
DestMipView.Access(x, y) = IntegrateAngularArea(*SrcMip, DirectionWS, ConeAngle, TexelAreaArray);
|
|
}
|
|
}
|
|
}
|
|
|
|
FORCEINLINE TStatId GetStatId() const
|
|
{
|
|
RETURN_QUICK_DECLARE_CYCLE_STAT(FAsyncGenerateMipsPerFaceWorker, STATGROUP_ThreadPoolAsyncTasks);
|
|
}
|
|
};
|
|
|
|
typedef FAsyncTask<FAsyncGenerateMipsPerFaceWorker> FAsyncGenerateMipsPerFaceTask;
|
|
TIndirectArray<FAsyncGenerateMipsPerFaceTask> AsyncTasks;
|
|
|
|
for (int32 Face = 0; Face < 6; ++Face)
|
|
{
|
|
auto* AsyncTask = new FAsyncGenerateMipsPerFaceTask(Face, DestMip, MipExtent, ConeAngle, TexelAreaArray.GetData(), &SrcMip);
|
|
AsyncTasks.Add(AsyncTask);
|
|
AsyncTask->StartBackgroundTask();
|
|
}
|
|
|
|
for (int32 TaskIndex = 0; TaskIndex < AsyncTasks.Num(); ++TaskIndex)
|
|
{
|
|
auto& AsyncTask = AsyncTasks[TaskIndex];
|
|
AsyncTask.EnsureCompletion();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int32 Face = 0; Face < 6; ++Face)
|
|
{
|
|
FImageView2D DestMipView(*DestMip, Face);
|
|
for (int32 y = 0; y < MipExtent; ++y)
|
|
{
|
|
for (int32 x = 0; x < MipExtent; ++x)
|
|
{
|
|
FVector DirectionWS = ComputeWSCubeDirectionAtTexelCenter(Face, x, y, MipInvSideExtent);
|
|
DestMipView.Access(x, y) = IntegrateAngularArea(SrcMip, DirectionWS, ConeAngle, TexelAreaArray.GetData());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void ITextureCompressorModule::GenerateAngularFilteredMips(TArray<FImage>& InOutMipChain, int32 NumMips, uint32 DiffuseConvolveMipLevel)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(GenerateAngularFilteredMips);
|
|
|
|
TArray<FImage> SrcMipChain;
|
|
Exchange(SrcMipChain, InOutMipChain);
|
|
InOutMipChain.Empty(NumMips);
|
|
|
|
// Generate simple averaged mips to accelerate angular filtering.
|
|
for (int32 MipIndex = SrcMipChain.Num(); MipIndex < NumMips; ++MipIndex)
|
|
{
|
|
FImage& BaseMip = SrcMipChain[MipIndex - 1];
|
|
int32 BaseExtent = BaseMip.SizeX;
|
|
int32 MipExtent = FMath::Max(BaseExtent >> 1, 1);
|
|
FImage* Mip = new(SrcMipChain) FImage(MipExtent, MipExtent, BaseMip.NumSlices, BaseMip.Format);
|
|
|
|
for(int32 Face = 0; Face < 6; ++Face)
|
|
{
|
|
FImageView2D BaseMipView(BaseMip, Face);
|
|
FImageView2D MipView(*Mip, Face);
|
|
|
|
for(int32 y = 0; y < MipExtent; ++y)
|
|
{
|
|
for(int32 x = 0; x < MipExtent; ++x)
|
|
{
|
|
FLinearColor Sum = (
|
|
BaseMipView.Access(x*2, y*2) +
|
|
BaseMipView.Access(x*2+1, y*2) +
|
|
BaseMipView.Access(x*2, y*2+1) +
|
|
BaseMipView.Access(x*2+1, y*2+1)
|
|
) * 0.25f;
|
|
MipView.Access(x,y) = Sum;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int32 Extent = 1 << (NumMips - 1);
|
|
int32 BaseExtent = Extent;
|
|
for (int32 i = 0; i < NumMips; ++i)
|
|
{
|
|
// 0:top mip 1:lowest mip = diffuse convolve
|
|
float NormalizedMipLevel = i / (float)(NumMips - DiffuseConvolveMipLevel);
|
|
float AdjustedMipLevel = NormalizedMipLevel * NumMips;
|
|
float NormalizedWidth = BaseExtent * FMath::Pow(2.0f, -AdjustedMipLevel);
|
|
float TexelSize = 1.0f / NormalizedWidth;
|
|
|
|
// 0.001f:sharp .. PI/2: diffuse convolve
|
|
// all lower mips are used for diffuse convolve
|
|
// above that the angle blends from sharp to diffuse convolved version
|
|
float ConeAngle = PI / 2.0f * TexelSize;
|
|
|
|
// restrict to reasonable range
|
|
ConeAngle = FMath::Clamp(ConeAngle, 0.002f, (float)PI / 2.0f);
|
|
|
|
UE_LOG(LogTextureCompressor, Verbose, TEXT("GenerateAngularFilteredMips %f %f %f %f %f"), NormalizedMipLevel, AdjustedMipLevel, NormalizedWidth, TexelSize, ConeAngle * 180 / PI);
|
|
|
|
// 0:normal, -1:4x faster, +1:4 times slower but more precise, -2, 2 ...
|
|
float QualityBias = 3.0f;
|
|
|
|
// defined to result in a area of 1.0f (NormalizedArea)
|
|
// optimized = 0.5f * FMath::Sqrt(1.0f / PI);
|
|
float SphereRadius = 0.28209478f;
|
|
float SegmentHeight = SphereRadius * (1.0f - FMath::Cos(ConeAngle));
|
|
// compute SphereSegmentArea
|
|
float AreaCoveredInNormalizedArea = 2 * PI * SphereRadius * SegmentHeight;
|
|
checkSlow(AreaCoveredInNormalizedArea <= 0.5f);
|
|
|
|
// unoptimized
|
|
// float FloatInputMip = FMath::Log2(FMath::Sqrt(AreaCoveredInNormalizedArea)) + InputMipCount - QualityBias;
|
|
// optimized
|
|
float FloatInputMip = 0.5f * FMath::Log2(AreaCoveredInNormalizedArea) + NumMips - QualityBias;
|
|
uint32 InputMip = FMath::Clamp(FMath::TruncToInt(FloatInputMip), 0, NumMips - 1);
|
|
|
|
FImage* Mip = new(InOutMipChain) FImage(Extent, Extent, 6, ERawImageFormat::RGBA32F);
|
|
GenerateAngularFilteredMip(Mip, SrcMipChain[InputMip], ConeAngle);
|
|
Extent = FMath::Max(Extent >> 1, 1);
|
|
}
|
|
}
|
|
|
|
void ITextureCompressorModule::AdjustImageColors(FImage& Image, const FTextureBuildSettings& InBuildSettings)
|
|
{
|
|
const FColorAdjustmentParameters& InParams = InBuildSettings.ColorAdjustment;
|
|
check( Image.SizeX > 0 && Image.SizeY > 0 );
|
|
|
|
if( !FMath::IsNearlyEqual( InParams.AdjustBrightness, 1.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustBrightnessCurve, 1.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustSaturation, 1.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustVibrance, 0.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustRGBCurve, 1.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustHue, 0.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustMinAlpha, 0.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
!FMath::IsNearlyEqual( InParams.AdjustMaxAlpha, 1.0f, (float)KINDA_SMALL_NUMBER ) ||
|
|
InBuildSettings.bChromaKeyTexture )
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(AdjustImageColors);
|
|
|
|
const FLinearColor ChromaKeyTarget = InBuildSettings.ChromaKeyColor;
|
|
const float ChromaKeyThreshold = InBuildSettings.ChromaKeyThreshold + SMALL_NUMBER;
|
|
const int64 NumPixels = (int64)Image.SizeX * Image.SizeY * Image.NumSlices;
|
|
TArrayView64<FLinearColor> ImageColors = Image.AsRGBA32F();
|
|
|
|
int64 NumPixelsEachJob;
|
|
int32 NumJobs = ImageParallelForComputeNumJobsForPixels(NumPixelsEachJob,NumPixels);
|
|
|
|
// bForceSingleThread is set to true when:
|
|
// editor or cooker is loading as this is when the derived data cache is rebuilt as it will already be limited to a single thread
|
|
// and thus overhead of multithreading will simply make it slower
|
|
bool bForceSingleThread = GIsEditorLoadingPackage || GIsCookerLoadingPackage || IsInAsyncLoadingThread();
|
|
|
|
// TFunction or auto are okay here
|
|
// TFunctionRef is not
|
|
TFunction<void (int32)> AdjustImageColorsFunc = [&](int32 Index)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(AdjustImageColors.PF);
|
|
|
|
int64 StartIndex = Index * NumPixelsEachJob;
|
|
int64 EndIndex = FMath::Min(StartIndex + NumPixelsEachJob, NumPixels);
|
|
for (int64 CurPixelIndex = StartIndex; CurPixelIndex < EndIndex; ++CurPixelIndex)
|
|
{
|
|
const FLinearColor OriginalColorRaw = ImageColors[CurPixelIndex];
|
|
|
|
FLinearColor OriginalColor = OriginalColorRaw;
|
|
if (InBuildSettings.bChromaKeyTexture && (OriginalColor.Equals(ChromaKeyTarget, ChromaKeyThreshold)))
|
|
{
|
|
OriginalColor = FLinearColor::Transparent;
|
|
}
|
|
|
|
// Convert to HSV
|
|
FLinearColor HSVColor = OriginalColor.LinearRGBToHSV();
|
|
float& PixelHue = HSVColor.R;
|
|
float& PixelSaturation = HSVColor.G;
|
|
float& PixelValue = HSVColor.B;
|
|
|
|
float OriginalLuminance = PixelValue;
|
|
|
|
// Apply brightness adjustment
|
|
PixelValue *= InParams.AdjustBrightness;
|
|
|
|
// Apply brightness power adjustment
|
|
if (!FMath::IsNearlyEqual(InParams.AdjustBrightnessCurve, 1.0f, (float)KINDA_SMALL_NUMBER) && InParams.AdjustBrightnessCurve != 0.0f)
|
|
{
|
|
// Raise HSV.V to the specified power
|
|
PixelValue = FMath::Pow(PixelValue, InParams.AdjustBrightnessCurve);
|
|
}
|
|
|
|
// Apply "vibrance" adjustment
|
|
if (!FMath::IsNearlyZero(InParams.AdjustVibrance, (float)KINDA_SMALL_NUMBER))
|
|
{
|
|
const float SatRaisePow = 5.0f;
|
|
const float InvSatRaised = FMath::Pow(1.0f - PixelSaturation, SatRaisePow);
|
|
|
|
const float ClampedVibrance = FMath::Clamp(InParams.AdjustVibrance, 0.0f, 1.0f);
|
|
const float HalfVibrance = ClampedVibrance * 0.5f;
|
|
|
|
const float SatProduct = HalfVibrance * InvSatRaised;
|
|
|
|
PixelSaturation += SatProduct;
|
|
}
|
|
|
|
// Apply saturation adjustment
|
|
PixelSaturation *= InParams.AdjustSaturation;
|
|
|
|
// Apply hue adjustment
|
|
PixelHue += InParams.AdjustHue;
|
|
|
|
// Clamp HSV values
|
|
{
|
|
PixelHue = FMath::Fmod(PixelHue, 360.0f);
|
|
if (PixelHue < 0.0f)
|
|
{
|
|
// Keep the hue value positive as HSVToLinearRGB prefers that
|
|
PixelHue += 360.0f;
|
|
}
|
|
PixelSaturation = FMath::Clamp(PixelSaturation, 0.0f, 1.0f);
|
|
|
|
// Clamp brightness if non-HDR
|
|
if (!InBuildSettings.bHDRSource)
|
|
{
|
|
PixelValue = FMath::Clamp(PixelValue, 0.0f, 1.0f);
|
|
}
|
|
}
|
|
|
|
// Convert back to a linear color
|
|
FLinearColor LinearColor = HSVColor.HSVToLinearRGB();
|
|
|
|
// Apply RGB curve adjustment (linear space)
|
|
if (!FMath::IsNearlyEqual(InParams.AdjustRGBCurve, 1.0f, (float)KINDA_SMALL_NUMBER) && InParams.AdjustRGBCurve != 0.0f)
|
|
{
|
|
LinearColor.R = FMath::Pow(LinearColor.R, InParams.AdjustRGBCurve);
|
|
LinearColor.G = FMath::Pow(LinearColor.G, InParams.AdjustRGBCurve);
|
|
LinearColor.B = FMath::Pow(LinearColor.B, InParams.AdjustRGBCurve);
|
|
}
|
|
|
|
// Clamp HDR RGB channels to 1 or the original luminance (max original RGB channel value), whichever is greater
|
|
if (InBuildSettings.bHDRSource)
|
|
{
|
|
LinearColor.R = FMath::Clamp(LinearColor.R, 0.0f, (OriginalLuminance > 1.0f ? OriginalLuminance : 1.0f));
|
|
LinearColor.G = FMath::Clamp(LinearColor.G, 0.0f, (OriginalLuminance > 1.0f ? OriginalLuminance : 1.0f));
|
|
LinearColor.B = FMath::Clamp(LinearColor.B, 0.0f, (OriginalLuminance > 1.0f ? OriginalLuminance : 1.0f));
|
|
}
|
|
|
|
// Remap the alpha channel
|
|
LinearColor.A = FMath::Lerp(InParams.AdjustMinAlpha, InParams.AdjustMaxAlpha, OriginalColor.A);
|
|
ImageColors[CurPixelIndex] = LinearColor;
|
|
}
|
|
};
|
|
|
|
ParallelFor(NumJobs, AdjustImageColorsFunc, bForceSingleThread);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compute the alpha channel how BokehDOF needs it setup
|
|
*
|
|
* @param Image Image to adjust
|
|
*/
|
|
static void ComputeBokehAlpha(FImage& Image)
|
|
{
|
|
check( Image.SizeX > 0 && Image.SizeY > 0 );
|
|
|
|
const int32 NumPixels = Image.SizeX * Image.SizeY * Image.NumSlices;
|
|
TArrayView64<FLinearColor> ImageColors = Image.AsRGBA32F();
|
|
|
|
// compute LinearAverage
|
|
FLinearColor LinearAverage;
|
|
{
|
|
FLinearColor LinearSum(0, 0, 0, 0);
|
|
for( int32 CurPixelIndex = 0; CurPixelIndex < NumPixels; ++CurPixelIndex )
|
|
{
|
|
LinearSum += ImageColors[ CurPixelIndex ];
|
|
}
|
|
LinearAverage = LinearSum / (float)NumPixels;
|
|
}
|
|
|
|
FLinearColor Scale(1, 1, 1, 1);
|
|
|
|
// we want to normalize the image to have 0.5 as average luminance, this is assuming clamping doesn't happen (can happen when using a very small Bokeh shape)
|
|
{
|
|
float RGBLum = (LinearAverage.R + LinearAverage.G + LinearAverage.B) / 3.0f;
|
|
|
|
// ideally this would be 1 but then some pixels would need to be >1 which is not supported for the textureformat we want to use.
|
|
// The value affects the occlusion computation of the BokehDOF
|
|
const float LumGoal = 0.25f;
|
|
|
|
// clamp to avoid division by 0
|
|
Scale *= LumGoal / FMath::Max(RGBLum, 0.001f);
|
|
}
|
|
|
|
{
|
|
for( int32 CurPixelIndex = 0; CurPixelIndex < NumPixels; ++CurPixelIndex )
|
|
{
|
|
const FLinearColor OriginalColor = ImageColors[ CurPixelIndex ];
|
|
|
|
// Convert to a linear color
|
|
FLinearColor LinearColor = OriginalColor * Scale;
|
|
float RGBLum = (LinearColor.R + LinearColor.G + LinearColor.B) / 3.0f;
|
|
LinearColor.A = FMath::Clamp(RGBLum, 0.0f, 1.0f);
|
|
ImageColors[ CurPixelIndex ] = LinearColor;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Replicates the contents of the red channel to the green, blue, and alpha channels.
|
|
*/
|
|
static void ReplicateRedChannel( TArray<FImage>& InOutMipChain )
|
|
{
|
|
const uint32 MipCount = InOutMipChain.Num();
|
|
for ( uint32 MipIndex = 0; MipIndex < MipCount; ++MipIndex )
|
|
{
|
|
FImage& SrcMip = InOutMipChain[MipIndex];
|
|
FLinearColor* FirstColor = (&SrcMip.AsRGBA32F()[0]);
|
|
FLinearColor* LastColor = FirstColor + (SrcMip.SizeX * SrcMip.SizeY * SrcMip.NumSlices);
|
|
for ( FLinearColor* Color = FirstColor; Color < LastColor; ++Color )
|
|
{
|
|
*Color = FLinearColor( Color->R, Color->R, Color->R, Color->R );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Replicates the contents of the alpha channel to the red, green, and blue channels.
|
|
*/
|
|
static void ReplicateAlphaChannel( TArray<FImage>& InOutMipChain )
|
|
{
|
|
const uint32 MipCount = InOutMipChain.Num();
|
|
for ( uint32 MipIndex = 0; MipIndex < MipCount; ++MipIndex )
|
|
{
|
|
FImage& SrcMip = InOutMipChain[MipIndex];
|
|
FLinearColor* FirstColor = (&SrcMip.AsRGBA32F()[0]);
|
|
FLinearColor* LastColor = FirstColor + (SrcMip.SizeX * SrcMip.SizeY * SrcMip.NumSlices);
|
|
for ( FLinearColor* Color = FirstColor; Color < LastColor; ++Color )
|
|
{
|
|
*Color = FLinearColor( Color->A, Color->A, Color->A, Color->A );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Flips the contents of the green channel.
|
|
* @param InOutMipChain - The mip chain on which the green channel shall be flipped.
|
|
*/
|
|
static void FlipGreenChannel( FImage& Image )
|
|
{
|
|
FLinearColor* FirstColor = (&Image.AsRGBA32F()[0]);
|
|
FLinearColor* LastColor = FirstColor + (Image.SizeX * Image.SizeY * Image.NumSlices);
|
|
for ( FLinearColor* Color = FirstColor; Color < LastColor; ++Color )
|
|
{
|
|
Color->G = 1.0f - FMath::Clamp(Color->G, 0.0f, 1.0f);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Detects whether or not the image contains an alpha channel where at least one texel is != 255.
|
|
*/
|
|
static bool DetectAlphaChannel(const FImage& InImage)
|
|
{
|
|
// Uncompressed data is required to check for an alpha channel.
|
|
const FLinearColor* SrcColors = (&InImage.AsRGBA32F()[0]);
|
|
const FLinearColor* LastColor = SrcColors + (InImage.SizeX * InImage.SizeY * InImage.NumSlices);
|
|
while (SrcColors < LastColor)
|
|
{
|
|
if (SrcColors->A < (1.0f - SMALL_NUMBER))
|
|
{
|
|
return true;
|
|
}
|
|
++SrcColors;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/** Calculate a scale per 4x4 block of each image, and apply it to the red/green channels. Store scale in the blue channel. */
|
|
static void ApplyYCoCgBlockScale(TArray<FImage>& InOutMipChain)
|
|
{
|
|
const uint32 MipCount = InOutMipChain.Num();
|
|
for (uint32 MipIndex = 0; MipIndex < MipCount; ++MipIndex)
|
|
{
|
|
FImage& SrcMip = InOutMipChain[MipIndex];
|
|
FLinearColor* FirstColor = (&SrcMip.AsRGBA32F()[0]);
|
|
|
|
int32 BlockWidthX = SrcMip.SizeX / 4;
|
|
int32 BlockWidthY = SrcMip.SizeY / 4;
|
|
|
|
for (int32 Slice = 0; Slice < SrcMip.NumSlices; ++Slice)
|
|
{
|
|
FLinearColor* SliceFirstColor = FirstColor + (SrcMip.SizeX * SrcMip.SizeY * Slice);
|
|
|
|
for (int32 Y = 0; Y < BlockWidthY; ++Y)
|
|
{
|
|
FLinearColor* RowFirstColor = SliceFirstColor + (Y * 4 * SrcMip.SizeY);
|
|
|
|
for (int32 X = 0; X < BlockWidthX; ++X)
|
|
{
|
|
FLinearColor* BlockFirstColor = RowFirstColor + (X * 4);
|
|
|
|
// Iterate block to find MaxComponent
|
|
float MaxComponent = 0.f;
|
|
for (int32 BlockY = 0; BlockY < 4; ++BlockY)
|
|
{
|
|
FLinearColor* Color = BlockFirstColor + (BlockY * SrcMip.SizeY);
|
|
for (int32 BlockX = 0; BlockX < 4; ++BlockX, ++Color)
|
|
{
|
|
MaxComponent = FMath::Max(FMath::Abs(Color->R - 128.f / 255.f), MaxComponent);
|
|
MaxComponent = FMath::Max(FMath::Abs(Color->G - 128.f / 255.f), MaxComponent);
|
|
}
|
|
}
|
|
|
|
const float Scale = (MaxComponent < 32.f / 255.f) ? 4.f : (MaxComponent < 64.f / 255.f) ? 2.f : 1.f;
|
|
const float OutB = (Scale - 1.f) * 8.f / 255.f;
|
|
|
|
// Iterate block to modify for scale
|
|
for (int32 BlockY = 0; BlockY < 4; ++BlockY)
|
|
{
|
|
FLinearColor* Color = BlockFirstColor + (BlockY * SrcMip.SizeY);
|
|
for (int32 BlockX = 0; BlockX < 4; ++BlockX, ++Color)
|
|
{
|
|
const float OutR = (Color->R - 128.f / 255.f) * Scale + 128.f / 255.f;
|
|
const float OutG = (Color->G - 128.f / 255.f) * Scale + 128.f / 255.f;
|
|
|
|
*Color = FLinearColor(OutR, OutG, OutB, Color->A);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static float RoughnessToSpecularPower(float Roughness)
|
|
{
|
|
float Div = FMath::Pow(Roughness, 4);
|
|
|
|
// Roughness of 0 should result in a high specular power
|
|
float MaxSpecPower = 10000000000.0f;
|
|
Div = FMath::Max(Div, 2.0f / (MaxSpecPower + 2.0f));
|
|
|
|
return 2.0f / Div - 2.0f;
|
|
}
|
|
|
|
static float SpecularPowerToRoughness(float SpecularPower)
|
|
{
|
|
float Out = FMath::Pow( SpecularPower * 0.5f + 1.0f, -0.25f );
|
|
|
|
return Out;
|
|
}
|
|
|
|
// @param CompositeTextureMode original type ECompositeTextureMode
|
|
void ApplyCompositeTexture(FImage& RoughnessSourceMips, const FImage& NormalSourceMips, uint8 CompositeTextureMode, float CompositePower)
|
|
{
|
|
check(RoughnessSourceMips.SizeX == NormalSourceMips.SizeX);
|
|
check(RoughnessSourceMips.SizeY == NormalSourceMips.SizeY);
|
|
|
|
FLinearColor* FirstColor = (&RoughnessSourceMips.AsRGBA32F()[0]);
|
|
const FLinearColor* NormalColors = (&NormalSourceMips.AsRGBA32F()[0]);
|
|
|
|
FLinearColor* LastColor = FirstColor + (RoughnessSourceMips.SizeX * RoughnessSourceMips.SizeY * RoughnessSourceMips.NumSlices);
|
|
for ( FLinearColor* Color = FirstColor; Color < LastColor; ++Color, ++NormalColors )
|
|
{
|
|
FVector Normal = FVector(NormalColors->R * 2.0f - 1.0f, NormalColors->G * 2.0f - 1.0f, NormalColors->B * 2.0f - 1.0f);
|
|
|
|
// to prevent crash for unknown CompositeTextureMode
|
|
float Dummy;
|
|
float* RefValue = &Dummy;
|
|
|
|
switch((ECompositeTextureMode)CompositeTextureMode)
|
|
{
|
|
case CTM_NormalRoughnessToRed:
|
|
RefValue = &Color->R;
|
|
break;
|
|
case CTM_NormalRoughnessToGreen:
|
|
RefValue = &Color->G;
|
|
break;
|
|
case CTM_NormalRoughnessToBlue:
|
|
RefValue = &Color->B;
|
|
break;
|
|
case CTM_NormalRoughnessToAlpha:
|
|
RefValue = &Color->A;
|
|
break;
|
|
default:
|
|
checkSlow(0);
|
|
}
|
|
|
|
// Toksvig estimation of variance
|
|
float LengthN = FMath::Min( Normal.Size(), 1.0f );
|
|
float Variance = ( 1.0f - LengthN ) / LengthN;
|
|
Variance = FMath::Max( 0.0f, Variance - 0.00004f );
|
|
|
|
Variance *= CompositePower;
|
|
|
|
float Roughness = *RefValue;
|
|
|
|
#if 0
|
|
float Power = RoughnessToSpecularPower( Roughness );
|
|
Power = Power / ( 1.0f + Variance * Power );
|
|
Roughness = SpecularPowerToRoughness( Power );
|
|
#else
|
|
// Refactored above to avoid divide by zero
|
|
float a = Roughness * Roughness;
|
|
float a2 = a * a;
|
|
float B = 2.0f * Variance * (a2 - 1.0f);
|
|
a2 = ( B - a2 ) / ( B - 1.0f );
|
|
Roughness = FMath::Pow( a2, 0.25f );
|
|
#endif
|
|
|
|
*RefValue = Roughness;
|
|
}
|
|
}
|
|
|
|
/*------------------------------------------------------------------------------
|
|
Image Compression.
|
|
------------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Asynchronous compression, used for compressing mips simultaneously.
|
|
*/
|
|
class FAsyncCompressionWorker
|
|
{
|
|
public:
|
|
/**
|
|
* Initializes the data and creates the async compression task.
|
|
*/
|
|
FAsyncCompressionWorker(const ITextureFormat* InTextureFormat, const FImage* InImages, uint32 InNumImages, const FTextureBuildSettings& InBuildSettings, FStringView InDebugTexturePathName, bool bInImageHasAlphaChannel, uint32 InExtData)
|
|
: TextureFormat(*InTextureFormat)
|
|
, SourceImages(InImages)
|
|
, BuildSettings(InBuildSettings)
|
|
, bImageHasAlphaChannel(bInImageHasAlphaChannel)
|
|
, ExtData(InExtData)
|
|
, NumImages(InNumImages)
|
|
, bCompressionResults(false)
|
|
, DebugTexturePathName(InDebugTexturePathName)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Compresses the texture
|
|
*/
|
|
void DoWork()
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(CompressImage);
|
|
|
|
bCompressionResults = TextureFormat.CompressImageEx(
|
|
SourceImages,
|
|
NumImages,
|
|
BuildSettings,
|
|
DebugTexturePathName,
|
|
bImageHasAlphaChannel,
|
|
ExtData,
|
|
CompressedImage
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Transfer the result of the compression to the OutCompressedImage
|
|
* Can only be called once
|
|
*/
|
|
bool ConsumeCompressionResults(FCompressedImage2D& OutCompressedImage)
|
|
{
|
|
OutCompressedImage = MoveTemp(CompressedImage);
|
|
return bCompressionResults;
|
|
}
|
|
|
|
private:
|
|
|
|
/** Texture format interface with which to compress. */
|
|
const ITextureFormat& TextureFormat;
|
|
/** The image(s) to compress. */
|
|
const FImage* SourceImages;
|
|
/** The resulting compressed image. */
|
|
FCompressedImage2D CompressedImage;
|
|
/** Build settings. */
|
|
FTextureBuildSettings BuildSettings;
|
|
/** true if the image has a non-white alpha channel. */
|
|
bool bImageHasAlphaChannel;
|
|
/** Extra data that the format may want to pass to each Compress call */
|
|
uint32 ExtData;
|
|
/** For miptails with multiple images going in to one, this is the number of them */
|
|
uint32 NumImages;
|
|
/** true if compression was successful. */
|
|
bool bCompressionResults;
|
|
FStringView DebugTexturePathName;
|
|
};
|
|
|
|
// compress mip-maps in InMipChain and add mips to Texture, might alter the source content
|
|
static bool CompressMipChain(
|
|
const ITextureFormat* TextureFormat,
|
|
const TArray<FImage>& MipChain,
|
|
const FTextureBuildSettings& Settings,
|
|
FStringView DebugTexturePathName,
|
|
TArray<FCompressedImage2D>& OutMips,
|
|
uint32& OutNumMipsInTail,
|
|
uint32& OutExtData)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(CompressMipChain)
|
|
|
|
const bool bImageHasAlphaChannel = !Settings.bForceNoAlphaChannel && (Settings.bForceAlphaChannel || DetectAlphaChannel(MipChain[0]));
|
|
|
|
// now call the Ex version now that we have the proper MipChain
|
|
const FTextureFormatCompressorCaps CompressorCaps = TextureFormat->GetFormatCapabilitiesEx(Settings, MipChain.Num(), MipChain[0], bImageHasAlphaChannel);
|
|
OutNumMipsInTail = CompressorCaps.NumMipsInTail;
|
|
OutExtData = CompressorCaps.ExtData;
|
|
|
|
int32 MipCount = MipChain.Num();
|
|
check(MipCount >= (int32)CompressorCaps.NumMipsInTail);
|
|
// This number was too small (128) for current hardware and caused too many
|
|
// context switch for work taking < 1ms. Bump the value for 2020 CPUs.
|
|
const int32 MinAsyncCompressionSize = 512;
|
|
const bool bAllowParallelBuild = TextureFormat->AllowParallelBuild();
|
|
bool bCompressionSucceeded = true;
|
|
int32 FirstMipTailIndex = MipCount;
|
|
uint32 StartCycles = FPlatformTime::Cycles();
|
|
|
|
// check if we need to merge mips together into tail
|
|
if (CompressorCaps.NumMipsInTail > 1)
|
|
{
|
|
FirstMipTailIndex = MipCount - CompressorCaps.NumMipsInTail;
|
|
}
|
|
|
|
OutMips.Empty(MipCount);
|
|
TArray<FAsyncCompressionWorker> AsyncCompressionTasks;
|
|
AsyncCompressionTasks.Reserve(MipCount);
|
|
|
|
struct PreWork
|
|
{
|
|
int32 MipIndex;
|
|
const FImage& SrcMip;
|
|
FCompressedImage2D& DestMip;
|
|
};
|
|
TArray<PreWork> PreWorkTasks;
|
|
PreWorkTasks.Reserve(MipCount);
|
|
|
|
for (int32 MipIndex = 0; MipIndex < MipCount; ++MipIndex)
|
|
{
|
|
const FImage& SrcMip = MipChain[MipIndex];
|
|
FCompressedImage2D& DestMip = *new(OutMips) FCompressedImage2D;
|
|
|
|
if (MipIndex > FirstMipTailIndex)
|
|
{
|
|
continue;
|
|
}
|
|
else if (bAllowParallelBuild && FMath::Min(SrcMip.SizeX, SrcMip.SizeY) >= MinAsyncCompressionSize)
|
|
{
|
|
AsyncCompressionTasks.Emplace(
|
|
TextureFormat,
|
|
&SrcMip,
|
|
MipIndex == FirstMipTailIndex ? CompressorCaps.NumMipsInTail : 1, // number of mips pointed to by SrcMip
|
|
Settings,
|
|
DebugTexturePathName,
|
|
bImageHasAlphaChannel,
|
|
CompressorCaps.ExtData
|
|
);
|
|
}
|
|
else
|
|
{
|
|
PreWorkTasks.Emplace(PreWork { MipIndex, SrcMip, DestMip });
|
|
}
|
|
}
|
|
|
|
ParallelForWithPreWork(AsyncCompressionTasks.Num(), [&AsyncCompressionTasks](int32 TaskIndex)
|
|
{
|
|
AsyncCompressionTasks[TaskIndex].DoWork();
|
|
},
|
|
[&PreWorkTasks, &TextureFormat, &OutMips, &bCompressionSucceeded, &CompressorCaps, &Settings, DebugTexturePathName, FirstMipTailIndex, bImageHasAlphaChannel]()
|
|
{
|
|
for (PreWork& Work : PreWorkTasks)
|
|
{
|
|
bCompressionSucceeded = bCompressionSucceeded && TextureFormat->CompressImageEx(
|
|
&Work.SrcMip,
|
|
Work.MipIndex == FirstMipTailIndex ? CompressorCaps.NumMipsInTail : 1, // number of mips pointed to by SrcMip
|
|
Settings,
|
|
DebugTexturePathName,
|
|
bImageHasAlphaChannel,
|
|
CompressorCaps.ExtData,
|
|
Work.DestMip
|
|
);
|
|
}
|
|
}, EParallelForFlags::Unbalanced);
|
|
|
|
for (int32 TaskIndex = 0; TaskIndex < AsyncCompressionTasks.Num(); ++TaskIndex)
|
|
{
|
|
FAsyncCompressionWorker& AsynTask = AsyncCompressionTasks[TaskIndex];
|
|
FCompressedImage2D& DestMip = OutMips[TaskIndex];
|
|
bCompressionSucceeded = bCompressionSucceeded && AsynTask.ConsumeCompressionResults(DestMip);
|
|
}
|
|
|
|
for (int32 MipIndex = FirstMipTailIndex + 1; MipIndex < MipCount; ++MipIndex)
|
|
{
|
|
FCompressedImage2D& PrevMip = OutMips[MipIndex - 1];
|
|
FCompressedImage2D& DestMip = OutMips[MipIndex];
|
|
DestMip.SizeX = FMath::Max(1, PrevMip.SizeX >> 1);
|
|
DestMip.SizeY = FMath::Max(1, PrevMip.SizeY >> 1);
|
|
DestMip.SizeZ = Settings.bVolume ? FMath::Max(1, PrevMip.SizeZ >> 1) : PrevMip.SizeZ;
|
|
DestMip.PixelFormat = PrevMip.PixelFormat;
|
|
}
|
|
|
|
if (!bCompressionSucceeded)
|
|
{
|
|
OutMips.Empty();
|
|
}
|
|
|
|
uint32 EndCycles = FPlatformTime::Cycles();
|
|
UE_LOG(LogTextureCompressor,Verbose,TEXT("Compressed %dx%dx%d %s in %fms"),
|
|
MipChain[0].SizeX,
|
|
MipChain[0].SizeY,
|
|
MipChain[0].NumSlices,
|
|
*Settings.TextureFormatName.ToString(),
|
|
FPlatformTime::ToMilliseconds( EndCycles-StartCycles )
|
|
);
|
|
|
|
return bCompressionSucceeded;
|
|
}
|
|
|
|
// only useful for normal maps, fixed bad input (denormalized normals) and improved quality (quantization artifacts)
|
|
static void NormalizeMip(FImage& InOutMip)
|
|
{
|
|
const uint32 NumPixels = InOutMip.SizeX * InOutMip.SizeY * InOutMip.NumSlices;
|
|
TArrayView64<FLinearColor> ImageColors = InOutMip.AsRGBA32F();
|
|
for(uint32 CurPixelIndex = 0; CurPixelIndex < NumPixels; ++CurPixelIndex)
|
|
{
|
|
FLinearColor& Color = ImageColors[CurPixelIndex];
|
|
|
|
FVector Normal = FVector(Color.R * 2.0f - 1.0f, Color.G * 2.0f - 1.0f, Color.B * 2.0f - 1.0f);
|
|
|
|
Normal = Normal.GetSafeNormal();
|
|
|
|
Color = FLinearColor(Normal.X * 0.5f + 0.5f, Normal.Y * 0.5f + 0.5f, Normal.Z * 0.5f + 0.5f, Color.A);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Texture compression module
|
|
*/
|
|
class FTextureCompressorModule : public ITextureCompressorModule
|
|
{
|
|
public:
|
|
FTextureCompressorModule()
|
|
#if PLATFORM_WINDOWS
|
|
: nvTextureToolsHandle(0)
|
|
#endif //PLATFORM_WINDOWS
|
|
{
|
|
}
|
|
|
|
virtual bool BuildTexture(
|
|
const TArray<FImage>& SourceMips,
|
|
const TArray<FImage>& AssociatedNormalSourceMips,
|
|
const FTextureBuildSettings& BuildSettings,
|
|
FStringView DebugTexturePathName,
|
|
TArray<FCompressedImage2D>& OutTextureMips,
|
|
uint32& OutNumMipsInTail,
|
|
uint32& OutExtData
|
|
)
|
|
{
|
|
const ITextureFormat* TextureFormat = nullptr;
|
|
|
|
ITextureFormatManagerModule* TFM = GetTextureFormatManager();
|
|
if (TFM)
|
|
{
|
|
TextureFormat = TFM->FindTextureFormat(BuildSettings.TextureFormatName);
|
|
}
|
|
if (TextureFormat == nullptr)
|
|
{
|
|
UE_LOG(LogTextureCompressor, Warning,
|
|
TEXT("Failed to find compressor for texture format '%s'."),
|
|
*BuildSettings.TextureFormatName.ToString()
|
|
);
|
|
|
|
return false;
|
|
}
|
|
|
|
TArray<FImage> IntermediateMipChain;
|
|
|
|
// we can't use the Ex version here because it needs an FImage, which needs BuildTextureMips to be called
|
|
const FTextureFormatCompressorCaps CompressorCaps = TextureFormat->GetFormatCapabilities();
|
|
|
|
if (!BuildTextureMips(SourceMips, BuildSettings, CompressorCaps, IntermediateMipChain))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// apply roughness adjustment depending on normal map variation
|
|
if (AssociatedNormalSourceMips.Num())
|
|
{
|
|
// check AssociatedNormalSourceMips.Format;
|
|
|
|
TArray<FImage> IntermediateAssociatedNormalSourceMipChain;
|
|
|
|
FTextureBuildSettings DefaultSettings;
|
|
|
|
// helps to reduce aliasing further
|
|
DefaultSettings.MipSharpening = -4.0f;
|
|
DefaultSettings.SharpenMipKernelSize = 4;
|
|
DefaultSettings.bApplyKernelToTopMip = true;
|
|
// important to make accurate computation with normal length
|
|
DefaultSettings.bRenormalizeTopMip = true;
|
|
|
|
if (!BuildTextureMips(AssociatedNormalSourceMips, DefaultSettings, CompressorCaps, IntermediateAssociatedNormalSourceMipChain))
|
|
{
|
|
UE_LOG(LogTextureCompressor, Warning, TEXT("Failed to generate texture mips for composite texture"));
|
|
}
|
|
|
|
if (!ApplyCompositeTexture(IntermediateMipChain, IntermediateAssociatedNormalSourceMipChain, BuildSettings.CompositeTextureMode, BuildSettings.CompositePower))
|
|
{
|
|
UE_LOG(LogTextureCompressor, Warning, TEXT("Failed to apply composite texture"));
|
|
}
|
|
}
|
|
|
|
// Set the correct biased texture size so that the compressor understands the original source image size
|
|
// This is requires for platforms that may need to tile based on the original source texture size
|
|
BuildSettings.TopMipSize.X = IntermediateMipChain[0].SizeX;
|
|
BuildSettings.TopMipSize.Y = IntermediateMipChain[0].SizeY;
|
|
BuildSettings.VolumeSizeZ = BuildSettings.bVolume ? IntermediateMipChain[0].NumSlices : 1;
|
|
if (BuildSettings.bTextureArray)
|
|
{
|
|
if (BuildSettings.bCubemap)
|
|
{
|
|
BuildSettings.ArraySlices = IntermediateMipChain[0].NumSlices / 6;
|
|
}
|
|
else
|
|
{
|
|
BuildSettings.ArraySlices = IntermediateMipChain[0].NumSlices;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
BuildSettings.ArraySlices = 1;
|
|
}
|
|
|
|
return CompressMipChain(TextureFormat, IntermediateMipChain, BuildSettings, DebugTexturePathName, OutTextureMips, OutNumMipsInTail, OutExtData);
|
|
}
|
|
|
|
// IModuleInterface implementation.
|
|
void StartupModule()
|
|
{
|
|
#if PLATFORM_WINDOWS
|
|
#if PLATFORM_64BITS
|
|
if (FWindowsPlatformMisc::HasAVX2InstructionSupport())
|
|
{
|
|
nvTextureToolsHandle = FPlatformProcess::GetDllHandle(*(FPaths::EngineDir() / TEXT("Binaries/ThirdParty/nvTextureTools/Win64/AVX2/nvtt_64.dll")));
|
|
}
|
|
else
|
|
{
|
|
nvTextureToolsHandle = FPlatformProcess::GetDllHandle(*(FPaths::EngineDir() / TEXT("Binaries/ThirdParty/nvTextureTools/Win64/nvtt_64.dll")));
|
|
}
|
|
#else //32-bit platform
|
|
nvTextureToolsHandle = FPlatformProcess::GetDllHandle(*(FPaths::EngineDir() / TEXT("Binaries/ThirdParty/nvTextureTools/Win32/nvtt_.dll")));
|
|
#endif
|
|
#endif //PLATFORM_WINDOWS
|
|
}
|
|
|
|
void ShutdownModule()
|
|
{
|
|
#if PLATFORM_WINDOWS
|
|
FPlatformProcess::FreeDllHandle(nvTextureToolsHandle);
|
|
nvTextureToolsHandle = 0;
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
#if PLATFORM_WINDOWS
|
|
// Handle to the nvtt dll
|
|
void* nvTextureToolsHandle;
|
|
#endif //PLATFORM_WINDOWS
|
|
|
|
bool BuildTextureMips(
|
|
const TArray<FImage>& InSourceMips,
|
|
const FTextureBuildSettings& BuildSettings,
|
|
const FTextureFormatCompressorCaps& CompressorCaps,
|
|
TArray<FImage>& OutMipChain)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(BuildTextureMips);
|
|
|
|
check(InSourceMips.Num());
|
|
check(InSourceMips[0].SizeX > 0 && InSourceMips[0].SizeY > 0 && InSourceMips[0].NumSlices > 0);
|
|
|
|
// Identify long-lat cubemaps.
|
|
const bool bLongLatCubemap = BuildSettings.bLongLatSource;
|
|
if (BuildSettings.bCubemap && !bLongLatCubemap)
|
|
{
|
|
if (BuildSettings.bTextureArray && (InSourceMips[0].NumSlices % 6) != 0)
|
|
{
|
|
// Cube array must have multiiple of 6 slices
|
|
return false;
|
|
}
|
|
if (!BuildSettings.bTextureArray && InSourceMips[0].NumSlices != 6)
|
|
{
|
|
// Non-array cube must have exactly 6 slices
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Determine the maximum possible mip counts for source and dest.
|
|
const int32 MaxSourceMipCount = bLongLatCubemap ?
|
|
1 + FMath::CeilLogTwo(ComputeLongLatCubemapExtents(InSourceMips[0], BuildSettings.MaxTextureResolution)) :
|
|
1 + FMath::CeilLogTwo(FMath::Max3(InSourceMips[0].SizeX, InSourceMips[0].SizeY, BuildSettings.bVolume ? InSourceMips[0].NumSlices : 1));
|
|
const int32 MaxDestMipCount = 1 + FMath::CeilLogTwo(FMath::Min(CompressorCaps.MaxTextureDimension, BuildSettings.MaxTextureResolution));
|
|
|
|
// Determine the number of mips required by BuildSettings.
|
|
int32 NumOutputMips = (BuildSettings.MipGenSettings == TMGS_NoMipmaps) ? 1 : MaxSourceMipCount;
|
|
|
|
int32 NumSourceMips = InSourceMips.Num();
|
|
|
|
// See if the smallest provided mip image is still too large for the current compressor.
|
|
int32 LevelsToUsableSource = FMath::Max(0, MaxSourceMipCount - MaxDestMipCount);
|
|
int32 StartMip = FMath::Max(0, LevelsToUsableSource);
|
|
|
|
if (BuildSettings.MipGenSettings == TMGS_LeaveExistingMips)
|
|
{
|
|
NumOutputMips = InSourceMips.Num() - StartMip;
|
|
if (NumOutputMips <= 0)
|
|
{
|
|
// We can't generate 0 mip maps
|
|
UE_LOG(LogTextureCompressor, Warning,
|
|
TEXT("The source image has %d mips while the first mip would be %d. Please verify the maximun texture size or change the mips gen settings."),
|
|
NumSourceMips,
|
|
StartMip);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
NumOutputMips = FMath::Min(NumOutputMips, MaxDestMipCount);
|
|
|
|
|
|
if (BuildSettings.MipGenSettings != TMGS_LeaveExistingMips || bLongLatCubemap)
|
|
{
|
|
NumSourceMips = 1;
|
|
}
|
|
|
|
TArray<FImage> PaddedSourceMips;
|
|
|
|
{
|
|
const FImage& FirstSourceMipImage = InSourceMips[0];
|
|
int32 TargetTextureSizeX = FirstSourceMipImage.SizeX;
|
|
int32 TargetTextureSizeY = FirstSourceMipImage.SizeY;
|
|
int32 TargetTextureSizeZ = BuildSettings.bVolume ? FirstSourceMipImage.NumSlices : 1; // Only used for volume texture.
|
|
bool bPadOrStretchTexture = false;
|
|
|
|
const int32 PowerOfTwoTextureSizeX = FMath::RoundUpToPowerOfTwo(TargetTextureSizeX);
|
|
const int32 PowerOfTwoTextureSizeY = FMath::RoundUpToPowerOfTwo(TargetTextureSizeY);
|
|
const int32 PowerOfTwoTextureSizeZ = FMath::RoundUpToPowerOfTwo(TargetTextureSizeZ);
|
|
switch (static_cast<const ETexturePowerOfTwoSetting::Type>(BuildSettings.PowerOfTwoMode))
|
|
{
|
|
case ETexturePowerOfTwoSetting::None:
|
|
break;
|
|
|
|
case ETexturePowerOfTwoSetting::PadToPowerOfTwo:
|
|
bPadOrStretchTexture = true;
|
|
TargetTextureSizeX = PowerOfTwoTextureSizeX;
|
|
TargetTextureSizeY = PowerOfTwoTextureSizeY;
|
|
TargetTextureSizeZ = PowerOfTwoTextureSizeZ;
|
|
break;
|
|
|
|
case ETexturePowerOfTwoSetting::PadToSquarePowerOfTwo:
|
|
bPadOrStretchTexture = true;
|
|
TargetTextureSizeX = TargetTextureSizeY = FMath::Max3<int32>(PowerOfTwoTextureSizeX, PowerOfTwoTextureSizeY, PowerOfTwoTextureSizeZ);
|
|
break;
|
|
|
|
default:
|
|
checkf(false, TEXT("Unknown entry in ETexturePowerOfTwoSetting::Type"));
|
|
break;
|
|
}
|
|
|
|
if (bPadOrStretchTexture)
|
|
{
|
|
// Want to stretch or pad the texture
|
|
bool bSuitableFormat = FirstSourceMipImage.Format == ERawImageFormat::RGBA32F;
|
|
|
|
FImage Temp;
|
|
if (!bSuitableFormat)
|
|
{
|
|
// convert to RGBA32F
|
|
FirstSourceMipImage.CopyTo(Temp, ERawImageFormat::RGBA32F, EGammaSpace::Linear);
|
|
}
|
|
|
|
// space for one source mip and one destination mip
|
|
const FImage& SourceImage = bSuitableFormat ? FirstSourceMipImage : Temp;
|
|
FImage& TargetImage = *new (PaddedSourceMips) FImage(TargetTextureSizeX, TargetTextureSizeY, BuildSettings.bVolume ? TargetTextureSizeZ : SourceImage.NumSlices, SourceImage.Format);
|
|
FLinearColor FillColor = BuildSettings.PaddingColor;
|
|
|
|
FLinearColor* TargetPtr = (FLinearColor*)TargetImage.RawData.GetData();
|
|
FLinearColor* SourcePtr = (FLinearColor*)SourceImage.RawData.GetData();
|
|
check(SourceImage.GetBytesPerPixel() == sizeof(FLinearColor));
|
|
check(TargetImage.GetBytesPerPixel() == sizeof(FLinearColor));
|
|
|
|
const int32 SourceBytesPerLine = SourceImage.SizeX * SourceImage.GetBytesPerPixel();
|
|
const int32 DestBytesPerLine = TargetImage.SizeX * TargetImage.GetBytesPerPixel();
|
|
for (int32 SliceIndex = 0; SliceIndex < SourceImage.NumSlices; ++SliceIndex)
|
|
{
|
|
for (int32 Y = 0; Y < TargetTextureSizeY; ++Y)
|
|
{
|
|
int32 XStart = 0;
|
|
if (Y < SourceImage.SizeY)
|
|
{
|
|
XStart = SourceImage.SizeX;
|
|
FMemory::Memcpy(TargetPtr, SourcePtr, SourceImage.SizeX * sizeof(FLinearColor));
|
|
SourcePtr += SourceImage.SizeX;
|
|
TargetPtr += SourceImage.SizeX;
|
|
}
|
|
|
|
for (int32 XPad = XStart; XPad < TargetImage.SizeX; ++XPad)
|
|
{
|
|
*TargetPtr++ = FillColor;
|
|
}
|
|
}
|
|
}
|
|
// Pad new slices for volume texture
|
|
for (int32 SliceIndex = SourceImage.NumSlices; SliceIndex < TargetImage.NumSlices; ++SliceIndex)
|
|
{
|
|
for (int32 Y = 0; Y < TargetImage.SizeY; ++Y)
|
|
{
|
|
for (int32 X = 0; X< TargetImage.SizeX; ++X)
|
|
{
|
|
*TargetPtr++ = FillColor;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const TArray<FImage>& PostOptionalUpscaleSourceMips = (PaddedSourceMips.Num() > 0) ? PaddedSourceMips : InSourceMips;
|
|
|
|
bool bBuildSourceImage = StartMip > (NumSourceMips - 1);
|
|
|
|
TArray<FImage> GeneratedSourceMips;
|
|
if (bBuildSourceImage)
|
|
{
|
|
// the source is larger than the compressor allows and no mip image exists to act as a smaller source.
|
|
// We must generate a suitable source image:
|
|
bool bSuitableFormat = PostOptionalUpscaleSourceMips.Last().Format == ERawImageFormat::RGBA32F;
|
|
const FImage& BaseImage = PostOptionalUpscaleSourceMips.Last();
|
|
|
|
if (BaseImage.SizeX != FMath::RoundUpToPowerOfTwo(BaseImage.SizeX) || BaseImage.SizeY != FMath::RoundUpToPowerOfTwo(BaseImage.SizeY))
|
|
{
|
|
UE_LOG(LogTextureCompressor, Warning,
|
|
TEXT("Source image %dx%d (npot) prevents resizing and is too large for compressors max dimension (%d)."),
|
|
BaseImage.SizeX,
|
|
BaseImage.SizeY,
|
|
CompressorCaps.MaxTextureDimension
|
|
);
|
|
return false;
|
|
}
|
|
|
|
FImage Temp;
|
|
if (!bSuitableFormat)
|
|
{
|
|
// convert to RGBA32F
|
|
BaseImage.CopyTo(Temp, ERawImageFormat::RGBA32F, EGammaSpace::Linear);
|
|
}
|
|
|
|
UE_LOG(LogTextureCompressor, Verbose,
|
|
TEXT("Source image %dx%d too large for compressors max dimension (%d). Resizing."),
|
|
BaseImage.SizeX,
|
|
BaseImage.SizeY,
|
|
CompressorCaps.MaxTextureDimension
|
|
);
|
|
GenerateMipChain(BuildSettings, bSuitableFormat ? BaseImage : Temp, GeneratedSourceMips, LevelsToUsableSource);
|
|
|
|
check(GeneratedSourceMips.Num() != 0);
|
|
// Note: The newly generated mip chain does not include the original top level mip.
|
|
StartMip--;
|
|
}
|
|
|
|
const TArray<FImage>& SourceMips = bBuildSourceImage ? GeneratedSourceMips : PostOptionalUpscaleSourceMips;
|
|
|
|
OutMipChain.Empty(NumOutputMips);
|
|
// Copy over base mips.
|
|
check(StartMip < SourceMips.Num());
|
|
int32 CopyCount = SourceMips.Num() - StartMip;
|
|
|
|
for (int32 MipIndex = StartMip; MipIndex < StartMip + CopyCount; ++MipIndex)
|
|
{
|
|
const FImage& Image = SourceMips[MipIndex];
|
|
|
|
// create base for the mip chain
|
|
FImage* Mip = new(OutMipChain) FImage();
|
|
|
|
if (bLongLatCubemap)
|
|
{
|
|
// Generate the base mip from the long-lat source image.
|
|
GenerateBaseCubeMipFromLongitudeLatitude2D(Mip, Image, BuildSettings.MaxTextureResolution, BuildSettings.SourceEncodingOverride);
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
// copy base source content to the base of the mip chain
|
|
if(BuildSettings.bApplyKernelToTopMip)
|
|
{
|
|
FImage Temp;
|
|
Image.Linearize(BuildSettings.SourceEncodingOverride, Temp);
|
|
if(BuildSettings.bRenormalizeTopMip)
|
|
{
|
|
NormalizeMip(Temp);
|
|
}
|
|
|
|
GenerateTopMip(Temp, *Mip, BuildSettings);
|
|
}
|
|
else
|
|
{
|
|
Image.Linearize(BuildSettings.SourceEncodingOverride, *Mip);
|
|
|
|
if(BuildSettings.bRenormalizeTopMip)
|
|
{
|
|
NormalizeMip(*Mip);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (BuildSettings.Downscale > 1.f)
|
|
{
|
|
FTextureDownscaleSettings DownscaleSettings;
|
|
DownscaleSettings.Downscale = BuildSettings.Downscale;
|
|
DownscaleSettings.DownscaleOptions = BuildSettings.DownscaleOptions;
|
|
DownscaleSettings.bDitherMipMapAlpha = BuildSettings.bDitherMipMapAlpha;
|
|
DownscaleSettings.BlockSize = 4;
|
|
|
|
DownscaleImage(*Mip, *Mip, DownscaleSettings);
|
|
}
|
|
|
|
if (BuildSettings.bHasColorSpaceDefinition)
|
|
{
|
|
Mip->TransformToWorkingColorSpace(
|
|
FVector2D(BuildSettings.RedChromaticityCoordinate),
|
|
FVector2D(BuildSettings.GreenChromaticityCoordinate),
|
|
FVector2D(BuildSettings.BlueChromaticityCoordinate),
|
|
FVector2D(BuildSettings.WhiteChromaticityCoordinate),
|
|
static_cast<UE::Color::EChromaticAdaptationMethod>(BuildSettings.ChromaticAdaptationMethod));
|
|
}
|
|
|
|
// Apply color adjustments
|
|
AdjustImageColors(*Mip, BuildSettings);
|
|
if (BuildSettings.bComputeBokehAlpha)
|
|
{
|
|
// To get the occlusion in the BokehDOF shader working for all Bokeh textures.
|
|
ComputeBokehAlpha(*Mip);
|
|
}
|
|
if (BuildSettings.bFlipGreenChannel)
|
|
{
|
|
FlipGreenChannel(*Mip);
|
|
}
|
|
}
|
|
|
|
// Generate any missing mips in the chain.
|
|
if (NumOutputMips > OutMipChain.Num())
|
|
{
|
|
// Do angular filtering of cubemaps if requested.
|
|
if (BuildSettings.MipGenSettings == TMGS_Angular)
|
|
{
|
|
GenerateAngularFilteredMips(OutMipChain, NumOutputMips, BuildSettings.DiffuseConvolveMipLevel);
|
|
}
|
|
else
|
|
{
|
|
GenerateMipChain(BuildSettings, OutMipChain.Last(), OutMipChain);
|
|
}
|
|
}
|
|
check(OutMipChain.Num() == NumOutputMips);
|
|
|
|
// Apply post-mip generation adjustments.
|
|
if (BuildSettings.bReplicateRed)
|
|
{
|
|
ReplicateRedChannel(OutMipChain);
|
|
}
|
|
else if (BuildSettings.bReplicateAlpha)
|
|
{
|
|
ReplicateAlphaChannel(OutMipChain);
|
|
}
|
|
if (BuildSettings.bApplyYCoCgBlockScale)
|
|
{
|
|
ApplyYCoCgBlockScale(OutMipChain);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// @param CompositeTextureMode original type ECompositeTextureMode
|
|
// @return true on success, false on failure. Can fail due to bad mismatched dimensions of incomplete mip chains.
|
|
bool ApplyCompositeTexture(TArray<FImage>& RoughnessSourceMips, const TArray<FImage>& NormalSourceMips, uint8 CompositeTextureMode, float CompositePower)
|
|
{
|
|
uint32 MinLevel = FMath::Min(RoughnessSourceMips.Num(), NormalSourceMips.Num());
|
|
|
|
if( RoughnessSourceMips[RoughnessSourceMips.Num() - MinLevel].SizeX != NormalSourceMips[NormalSourceMips.Num() - MinLevel].SizeX ||
|
|
RoughnessSourceMips[RoughnessSourceMips.Num() - MinLevel].SizeY != NormalSourceMips[NormalSourceMips.Num() - MinLevel].SizeY )
|
|
{
|
|
UE_LOG(LogTextureCompressor, Warning, TEXT("Couldn't apply composite texture as RoughnessSourceMips (mip %d, %d x %d) doesn't match NormalSourceMips (mip %d, %d x %d); mipchain might be mismatched/incomplete"),
|
|
RoughnessSourceMips.Num() - MinLevel,
|
|
RoughnessSourceMips[RoughnessSourceMips.Num() - MinLevel].SizeX,
|
|
RoughnessSourceMips[RoughnessSourceMips.Num() - MinLevel].SizeY,
|
|
NormalSourceMips.Num() - MinLevel,
|
|
NormalSourceMips[NormalSourceMips.Num() - MinLevel].SizeX,
|
|
NormalSourceMips[NormalSourceMips.Num() - MinLevel].SizeY
|
|
);
|
|
return false;
|
|
}
|
|
|
|
for(uint32 Level = 0; Level < MinLevel; ++Level)
|
|
{
|
|
::ApplyCompositeTexture(RoughnessSourceMips[RoughnessSourceMips.Num() - 1 - Level], NormalSourceMips[NormalSourceMips.Num() - 1 - Level], CompositeTextureMode, CompositePower);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
IMPLEMENT_MODULE(FTextureCompressorModule, TextureCompressor)
|