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/* Copyright 2015-2016 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include "pch.h"
#include "TextureLoader.h"
#include "GraphicsUtilities.h"
#include <algorithm>
#include <limits>
#include "DDSLoader.h"
using namespace Diligent;
namespace Diligent
{
static const float a = 0.055f;
// https://en.wikipedia.org/wiki/SRGB
float SRGBToLinear(float SRGB)
{
if( SRGB < 0.04045f )
return SRGB / 12.92f;
else
return powf( (SRGB + a) / (1 + a), 2.4f );
}
float LinearToSRGB( float c )
{
if( c < 0.0031308f )
return 12.92f * c;
else
return (1+a) * pow(c, 1.f/2.4f) - a;
}
template<typename ChannelType>
ChannelType SRGBAverage(ChannelType c0, ChannelType c1, ChannelType c2, ChannelType c3)
{
const float NormVal = static_cast<float>(std::numeric_limits<ChannelType>::max());
float fc0 = static_cast<float>(c0) / NormVal;
float fc1 = static_cast<float>(c1) / NormVal;
float fc2 = static_cast<float>(c2) / NormVal;
float fc3 = static_cast<float>(c3) / NormVal;
float fLinearAverage = (SRGBToLinear( fc0 ) + SRGBToLinear( fc1 ) + SRGBToLinear( fc2 ) + SRGBToLinear( fc3 )) / 4.f;
float fSRGBAverage = LinearToSRGB(fLinearAverage);
Int32 SRGBAverage = static_cast<Int32>(fSRGBAverage * NormVal);
SRGBAverage = std::min(SRGBAverage, static_cast<Int32>( std::numeric_limits<ChannelType>::max()) );
SRGBAverage = std::max(SRGBAverage, static_cast<Int32>( std::numeric_limits<ChannelType>::min()) );
return static_cast<ChannelType>(SRGBAverage);
}
template < typename ChannelType >
void ComputeCoarseMip(Uint32 NumChannels, bool IsSRGB,
const void *pFineMip, Uint32 FineMipStride,
void *pCoarseMip, Uint32 CoarseMipStride,
Uint32 CoarseMipWidth, Uint32 CoarseMipHeight)
{
for( Uint32 row = 0; row < CoarseMipHeight; ++row )
for( Uint32 col = 0; col < CoarseMipWidth; ++col )
{
auto FineRow0 = reinterpret_cast<const ChannelType*>( reinterpret_cast<const Uint8*>(pFineMip) + row * 2 * FineMipStride );
auto FineRow1 = reinterpret_cast<const ChannelType*>( reinterpret_cast<const Uint8*>(pFineMip) + (row * 2 + 1 ) * FineMipStride );
for( Uint32 c = 0; c < NumChannels; ++c )
{
auto Col00 = FineRow0[ col*2 * NumChannels + c ];
auto Col01 = FineRow0[ (col*2+1) * NumChannels + c ];
auto Col10 = FineRow1[ col*2 * NumChannels + c ];
auto Col11 = FineRow1[ (col*2+1) * NumChannels + c ];
auto &DstCol = reinterpret_cast<ChannelType*>(reinterpret_cast<Uint8*>(pCoarseMip) + row * CoarseMipStride)[col * NumChannels + c];
if( IsSRGB )
DstCol = SRGBAverage( Col00, Col01, Col10, Col11 );
else
DstCol = (Col00 + Col01 + Col10 + Col11)/4;
}
}
}
template < typename ChannelType >
void RGBToRGBA(const void *pRGBData, Uint32 RGBStride,
void *pRGBAData, Uint32 RGBAStride,
Uint32 Width, Uint32 Height)
{
for( Uint32 row = 0; row < Height; ++row )
for( Uint32 col = 0; col < Width; ++col )
{
for( int c = 0; c < 3; ++c )
{
reinterpret_cast<ChannelType*>( (reinterpret_cast<Uint8*>(pRGBAData) + RGBAStride * row) ) [col *4 + c] =
reinterpret_cast<const ChannelType*>( (reinterpret_cast<const Uint8*>(pRGBData) + RGBStride * row))[col*3 + c];
}
reinterpret_cast<ChannelType*>( (reinterpret_cast<Uint8*>(pRGBAData) + RGBAStride * row) ) [col *4 + 3] = std::numeric_limits<ChannelType>::max();
}
}
void CreateTextureFromImage( Image *pSrcImage,
const TextureLoadInfo& TexLoadInfo,
Diligent::IRenderDevice *pDevice,
Diligent::ITexture **ppTexture )
{
const auto& ImgDesc = pSrcImage->GetDesc();
TextureDesc TexDesc;
TexDesc.Type = RESOURCE_DIM_TEX_2D;
TexDesc.Width = ImgDesc.Width;
TexDesc.Height = ImgDesc.Height;
TexDesc.MipLevels = ComputeMipLevelsCount( TexDesc.Width, TexDesc.Height );
if( TexLoadInfo.MipLevels > 0 )
TexDesc.MipLevels = std::min(TexDesc.MipLevels, TexLoadInfo.MipLevels);
TexDesc.Usage = TexLoadInfo.Usage;
TexDesc.BindFlags = TexLoadInfo.BindFlags;
TexDesc.Format = TexLoadInfo.Format;
TexDesc.CPUAccessFlags = TexLoadInfo.CPUAccessFlags;
auto ChannelDepth = ImgDesc.BitsPerPixel / ImgDesc.NumComponents;
Uint32 NumComponents = ImgDesc.NumComponents == 3 ? 4 : ImgDesc.NumComponents;
bool IsSRGB = (ImgDesc.NumComponents >= 3 && ChannelDepth == 8) ? TexLoadInfo.IsSRGB : false;
if( TexDesc.Format == TEX_FORMAT_UNKNOWN )
{
if( ChannelDepth == 8 )
{
switch( NumComponents )
{
case 1: TexDesc.Format = TEX_FORMAT_R8_UNORM; break;
case 2: TexDesc.Format = TEX_FORMAT_RG8_UNORM; break;
case 4: TexDesc.Format = IsSRGB ? TEX_FORMAT_RGBA8_UNORM_SRGB : TEX_FORMAT_RGBA8_UNORM; break;
default: LOG_ERROR_AND_THROW( "Unexpected number of color channels (", ImgDesc.NumComponents, ")" );
}
}
else if( ChannelDepth == 16 )
{
switch( NumComponents )
{
case 1: TexDesc.Format = TEX_FORMAT_R16_UNORM; break;
case 2: TexDesc.Format = TEX_FORMAT_RG16_UNORM; break;
case 4: TexDesc.Format = TEX_FORMAT_RGBA16_UNORM; break;
default: LOG_ERROR_AND_THROW( "Unexpected number of color channels (", ImgDesc.NumComponents, ")" );
}
}
else
LOG_ERROR_AND_THROW( "Unsupported color channel depth (", ChannelDepth, ")" );
}
else
{
const auto& TexFmtDesc = GetTextureFormatAttribs( TexDesc.Format );
if( TexFmtDesc.NumComponents != NumComponents )
LOG_ERROR_AND_THROW( "Incorrect number of components ", ImgDesc.NumComponents, ") for texture format ", TexFmtDesc.Name );
if( TexFmtDesc.ComponentSize != ChannelDepth / 8 )
LOG_ERROR_AND_THROW( "Incorrect channel size ", ChannelDepth, ") for texture format ", TexFmtDesc.Name );
}
std::vector<TextureSubResData> pSubResources(TexDesc.MipLevels);
std::vector< std::vector<Uint8> > Mips(TexDesc.MipLevels);
if( ImgDesc.NumComponents == 3 )
{
VERIFY_EXPR( NumComponents == 4 );
auto RGBAStride = ImgDesc.Width * NumComponents * ChannelDepth / 8;
RGBAStride = (RGBAStride + 3) & (-4);
Mips[0].resize(RGBAStride * ImgDesc.Height);
pSubResources[0].pData = Mips[0].data();
pSubResources[0].Stride = RGBAStride;
if( ChannelDepth == 8 )
RGBToRGBA<Uint8>( pSrcImage->GetData()->GetDataPtr(), ImgDesc.RowStride,
Mips[0].data(), RGBAStride,
ImgDesc.Width, ImgDesc.Height);
else if( ChannelDepth == 16 )
RGBToRGBA<Uint16>( pSrcImage->GetData()->GetDataPtr(), ImgDesc.RowStride,
Mips[0].data(), RGBAStride,
ImgDesc.Width, ImgDesc.Height);
}
else
{
pSubResources[0].pData = pSrcImage->GetData()->GetDataPtr();
pSubResources[0].Stride = ImgDesc.RowStride;
}
auto MipWidth = TexDesc.Width;
auto MipHeight = TexDesc.Height;
for( Uint32 m = 1; m < TexDesc.MipLevels; ++m )
{
auto CoarseMipWidth = std::max(MipWidth/2u, 1u);
auto CoarseMipHeight = std::max(MipHeight/2u, 1u);
auto CoarseMipStride = CoarseMipWidth * NumComponents * ChannelDepth / 8;
CoarseMipStride = (CoarseMipStride + 3) & (-4);
Mips[m].resize(CoarseMipStride * CoarseMipHeight);
if( ChannelDepth == 8 )
ComputeCoarseMip<Uint8>( NumComponents, IsSRGB,
pSubResources[m-1].pData, pSubResources[m-1].Stride,
Mips[m].data(), CoarseMipStride,
CoarseMipWidth, CoarseMipHeight);
else if( ChannelDepth == 16 )
ComputeCoarseMip<Uint16>( NumComponents, IsSRGB,
pSubResources[m-1].pData, pSubResources[m-1].Stride,
Mips[m].data(), CoarseMipStride,
CoarseMipWidth, CoarseMipHeight);
pSubResources[m].pData = Mips[m].data();
pSubResources[m].Stride = CoarseMipStride;
MipWidth = CoarseMipWidth;
MipHeight = CoarseMipHeight;
}
TextureData TexData;
TexData.pSubResources = pSubResources.data();
TexData.NumSubresources = TexDesc.MipLevels;
pDevice->CreateTexture( TexDesc, TexData, ppTexture );
}
void CreateTextureFromDDS( IDataBlob *pDDSData,
const TextureLoadInfo& TexLoadInfo,
Diligent::IRenderDevice *pDevice,
Diligent::ITexture **ppTexture )
{
CreateDDSTextureFromMemoryEx(pDevice,
reinterpret_cast<const Uint8*>(pDDSData->GetDataPtr()),
static_cast<size_t>(pDDSData->GetSize()),
0, // maxSize
TexLoadInfo.Usage,
TexLoadInfo.BindFlags,
TexLoadInfo.CPUAccessFlags,
0, // miscFlags
TexLoadInfo.IsSRGB, // forceSRGB
ppTexture );
}
}
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