bool LibDxtHelper::DecompressImageToRGBA(const Image & image, Vector<Image*> &imageSet, bool forseSoftwareConvertation)
{
if(!(image.format >= FORMAT_DXT1 && image.format <= FORMAT_DXT5NM) )
{
Logger::Error("[LibDxtHelper::DecompressImageToRGBA] Wrong copression format (%d).", image.format);
return false;
}
nvtt::Format innerComprFormat = NvttHelper::GetNVTTFormatByPixelFormat(image.format);
if(nvtt::Format_BC5 == innerComprFormat)
{ //bc5 is unsupported, used to determinate fail in search
Logger::Error("[LibDxtHelper::DecompressImageToRGBA] Can't work with nvtt::Format_BC5.");
return false;
}
InputOptions inputOptions;
inputOptions.setTextureLayout(TextureType_2D, image.width, image.height);
inputOptions.setMipmapGeneration(false);
CompressionOptions compressionOptions;
compressionOptions.setFormat(innerComprFormat);
if(FORMAT_DXT1NM == image.format)
{
compressionOptions.setColorWeights(1, 1, 0);
}
else if (FORMAT_DXT5NM == image.format)
{
inputOptions.setNormalMap(true);
}
uint32 headerSize = DX10HEADER_SIZE;
uint8* imageHeaderBuffer = new uint8[headerSize];
uint32 realHeaderSize = nvtt::Decompressor::getHeader(imageHeaderBuffer, headerSize, inputOptions, compressionOptions);
nvtt::Decompressor dec;
uint8* compressedImageBuffer = new uint8[realHeaderSize + image.dataSize];
memcpy(compressedImageBuffer, imageHeaderBuffer, realHeaderSize);
memcpy(compressedImageBuffer + realHeaderSize, image.data, image.dataSize);
SafeDeleteArray(imageHeaderBuffer);
bool retValue = NvttHelper::InitDecompressor(dec, compressedImageBuffer, realHeaderSize + image.dataSize);
if(retValue)
{
retValue = NvttHelper::ReadDxtFile(dec, imageSet, forseSoftwareConvertation);
}
SafeDeleteArray(compressedImageBuffer);
return retValue;
}
bool LibDxtHelper::WriteDxtFile(const String & fileNameOriginal, int32 width, int32 height, uint8 * data, PixelFormat compressionFormat, bool generateMipmaps)
{
if(!( (compressionFormat >= FORMAT_DXT1 && compressionFormat <= FORMAT_DXT5NM)|| (compressionFormat == FORMAT_RGBA8888)) )
{
Logger::Error("[LibDxtHelper::WriteDxtFile] Wrong copression format (%d).", compressionFormat);
return false;
}
//creating tmp dds file, nvtt accept only filename.dds as input, because of this the last letter befor "." should be changed to "_".
String extension = FileSystem::Instance()->GetExtension(fileNameOriginal);
if(0 != CompareCaseInsensitive(extension, ".dds"))
{
Logger::Error("[LibDxtHelper::WriteDxtFile] Wrong input file name (%s).", fileNameOriginal.c_str());
return false;
}
nvtt::Format innerComprFormat = NvttHelper::GetNVTTFormatByPixelFormat(compressionFormat);
if(nvtt::Format_BC5 == innerComprFormat)
{ //bc5 is unsupported, used to determinate fail in search
Logger::Error("[LibDxtHelper::WriteDxtFile] Can't work with nvtt::Format_BC5.");
return false;
}
uint32 imgDataSize = width * height * Texture::GetPixelFormatSizeInBytes(FORMAT_RGBA8888);
NvttHelper::SwapBRChannels(data, imgDataSize);
InputOptions inputOptions;
inputOptions.setTextureLayout(TextureType_2D, width, height);
inputOptions.setMipmapGeneration(generateMipmaps);
inputOptions.setMipmapData(data, width, height);
CompressionOptions compressionOptions;
compressionOptions.setFormat(innerComprFormat);
if(FORMAT_DXT1NM == compressionFormat)
{
compressionOptions.setColorWeights(1, 1, 0);
}
else if (FORMAT_DXT5NM == compressionFormat)
{
inputOptions.setNormalMap(true);
}
OutputOptions outputOptions;
String fileName = FileSystem::Instance()->ReplaceExtension(fileNameOriginal, "_dds");
outputOptions.setFileName(fileName.c_str());
Compressor compressor;
bool ret = compressor.process(inputOptions, compressionOptions, outputOptions);
if(ret)
{
FileSystem::Instance()->DeleteFile(fileNameOriginal);
if(!FileSystem::Instance()->MoveFile(fileName, fileNameOriginal, true))
{
Logger::Error("[LibDxtHelper::WriteDxtFile] Temporary dds file renamig failed.");
ret = false;
}
}
else
{
Logger::Error("[LibDxtHelper::WriteDxtFile] Error during writing DDS file (%s).", fileName.c_str());
}
return ret;
}