public static void DecodeTexture(FTexture2DMipMap mip, EPixelFormat format, bool isNormalMap, out byte[] data, out SKColorType colorType)
{
switch (format)
{
case EPixelFormat.PF_DXT1:
data = DXTDecoder.DXT1(mip.Data.Data, mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_DXT5:
data = DXTDecoder.DXT5(mip.Data.Data, mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ASTC_4x4:
case EPixelFormat.PF_ASTC_6x6:
case EPixelFormat.PF_ASTC_8x8:
case EPixelFormat.PF_ASTC_10x10:
case EPixelFormat.PF_ASTC_12x12:
data = ASTCDecoder.RGBA8888(
mip.Data.Data,
FormatHelper.GetBlockWidth(format),
FormatHelper.GetBlockHeight(format),
FormatHelper.GetBlockDepth(format),
mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
if (isNormalMap)
{
// UE4 drops blue channel for normal maps before encoding, restore it
unsafe
{
var offset = 0;
fixed(byte *d = data)
{
for (var i = 0; i < mip.SizeX * mip.SizeY; i++)
{
d[offset + 2] = BCDecoder.GetZNormal(d[offset], d[offset + 1]);
offset += 4;
}
}
}
}
break;
case EPixelFormat.PF_BC4:
data = BCDecoder.BC4(mip.Data.Data, mip.SizeX, mip.SizeY);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC5:
data = BCDecoder.BC5(mip.Data.Data, mip.SizeX, mip.SizeY);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC6H:
// BC6H doesn't work no matter the pixel format, the closest we can get is either
// Rgb565 DETEX_PIXEL_FORMAT_FLOAT_RGBX16 or Rgb565 DETEX_PIXEL_FORMAT_FLOAT_BGRX16
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, true,
DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC_FLOAT,
DetexPixelFormat.DETEX_PIXEL_FORMAT_FLOAT_RGBX16);
colorType = SKColorType.Rgb565;
break;
case EPixelFormat.PF_BC7:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC,
DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC1:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC1,
DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGB:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2,
DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGBA:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2_EAC,
DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_R16F:
case EPixelFormat.PF_R16F_FILTER:
unsafe
{
fixed(byte *d = mip.Data.Data)
{
data = ConvertRawR16DataToRGB888X(mip.SizeX, mip.SizeY, d, mip.SizeX * 2); // 2 BPP
}
}
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_B8G8R8A8:
data = mip.Data.Data;
colorType = SKColorType.Bgra8888;
break;
case EPixelFormat.PF_G8:
data = mip.Data.Data;
colorType = SKColorType.Gray8;
break;
case EPixelFormat.PF_FloatRGBA:
unsafe
{
fixed(byte *d = mip.Data.Data)
{
data = ConvertRawR16G16B16A16FDataToRGBA8888(mip.SizeX, mip.SizeY, d, mip.SizeX * 8, false); // 8 BPP
}
}
colorType = SKColorType.Rgba8888;
break;
default: throw new NotImplementedException($"Unknown pixel format: {format}");
}
}
private static void DecodeTexture(FTexture2DMipMap mip, EPixelFormat format, out byte[] data, out SKColorType colorType)
{
switch (format)
{
case EPixelFormat.PF_DXT1:
data = DXTDecoder.DXT1(mip.Data.Data, mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_DXT5:
data = DXTDecoder.DXT5(mip.Data.Data, mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ASTC_8x8:
data = ASTCDecoder.RGBA8888(
mip.Data.Data,
FormatHelper.GetBlockWidth(format),
FormatHelper.GetBlockHeight(format),
FormatHelper.GetBlockDepth(format),
mip.SizeX, mip.SizeY, mip.SizeZ);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_BC4:
data = BCDecoder.BC4(mip.Data.Data, mip.SizeX, mip.SizeY);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC5:
data = BCDecoder.BC5(mip.Data.Data, mip.SizeX, mip.SizeY);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_BC6H:
// BC6H doesn't work no matter the pixel format, the closest we can get is either
// Rgb565 DETEX_PIXEL_FORMAT_FLOAT_RGBX16 or Rgb565 DETEX_PIXEL_FORMAT_FLOAT_BGRX16
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, true,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC_FLOAT,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_FLOAT_RGBX16);
colorType = SKColorType.Rgb565;
break;
case EPixelFormat.PF_BC7:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_BPTC,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgb888x;
break;
case EPixelFormat.PF_ETC1:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC1,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGB:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_ETC2_RGBA:
data = Detex.DecodeDetexLinear(mip.Data.Data, mip.SizeX, mip.SizeY, false,
inputFormat: DetexTextureFormat.DETEX_TEXTURE_FORMAT_ETC2_EAC,
outputPixelFormat: DetexPixelFormat.DETEX_PIXEL_FORMAT_RGBA8);
colorType = SKColorType.Rgba8888;
break;
case EPixelFormat.PF_B8G8R8A8:
data = mip.Data.Data;
colorType = SKColorType.Bgra8888;
break;
case EPixelFormat.PF_G8:
data = mip.Data.Data;
colorType = SKColorType.Gray8;
break;
case EPixelFormat.PF_FloatRGBA:
data = mip.Data.Data;
colorType = SKColorType.RgbaF16;
break;
default: throw new NotImplementedException($"Unknown pixel format: {format}");
}
}
