public static TextureFormat ConvertBasisTextureFormat(TranscoderTextureFormat format)
{
TextureFormat unityTF = 0;
switch (format)
{
case TranscoderTextureFormat.ETC1:
unityTF = TextureFormat.ETC_RGB4;
break;
case TranscoderTextureFormat.ETC2:
//???
goto default;
case TranscoderTextureFormat.PVRTC1_4_OPAQUE_ONLY:
unityTF = TextureFormat.PVRTC_RGB4;
break;
case TranscoderTextureFormat.BC1:
unityTF = TextureFormat.DXT1;
break;
case TranscoderTextureFormat.BC3:
//???
goto default;
case TranscoderTextureFormat.BC4:
unityTF = TextureFormat.BC4;
break;
case TranscoderTextureFormat.BC5:
unityTF = TextureFormat.BC5;
break;
case TranscoderTextureFormat.BC7_M6_OPAQUE_ONLY:
unityTF = TextureFormat.BC7;
break;
default:
throw new Exception($"TranscoderTextureFormat {format.ToString()} not supported by Unity");
}
return(unityTF);
}
//TODO(Simon): If image has multiple levels (mips), add them to LoadRawTextureData if mipChain == true. if false, set mipChain to false
public Texture2D GetTexture(int imageIndex = 0, int levelIndex = 0, TranscoderTextureFormat format = TranscoderTextureFormat.ETC1, bool mipChain = true, bool linear = false)
{
if (!transcodingStarted)
{
StartTranscoding();
transcodingStarted = true;
}
if (format == TranscoderTextureFormat.PVRTC1_4_OPAQUE_ONLY)
{
}
var width = ImageWidth(imageIndex, levelIndex);
var height = ImageHeight(imageIndex, levelIndex);
var unityTF = ConvertBasisTextureFormat(format);
var transcoded = TranscodeImage(imageIndex, levelIndex, format, false, false, out int size);
var texture = new Texture2D(width, height, unityTF, mipChain, linear);
texture.LoadRawTextureData(transcoded, size);
texture.Apply();
return(texture);
}
public IntPtr TranscodeImage(int imageIndex, int levelIndex, TranscoderTextureFormat format, bool pvrtcWrapAddressing, bool getAlphaForOpaqueFormats, out int size)
{
//NOTE(Simon): int size is a size_t in C++, but C# can't handle array size > 32bit anyways, so it's an int here.
bf_transcodeImage(nativeFile, out IntPtr dst, out size, imageIndex, levelIndex, format, pvrtcWrapAddressing, getAlphaForOpaqueFormats);
return(dst);
}
public static extern bool bf_transcodeImage(IntPtr file, out IntPtr dst, out int size, int image_index, int level_index, TranscoderTextureFormat format, bool pvrtc_wrap_addressing, bool get_alpha_for_opaque_formats);
