Compression artifacts with -bc3

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Reported in the forums:

http://developer.nvidia.com/forums/index.php?showtopic=2893&pid=8291&mode=thread
ed&start=#entry8291

Original issue reported on code.google.com by cast...@gmail.com on 16 Apr 2009 at 8:49

[GoogleCodeExporter]

I can confirm this too. We using the SVN latest version on GeForce 8800GTX with 
Cuda
2.2-beta on Windows XP 32-bit.

We are getting blocky textures - it looks like something connected with the 
alpha.

This is my code:

                if( use_nvtt )
                {
                    nvtt::CompressionOptions compressionOptions;
                    compressionOptions.setQuality(nvtt::Quality_Highest);
                    switch( options.textureFormat )
                    {
                        case kDXT1:  compressionOptions.setFormat(nvtt::Format_DXT1); break;
                        case kDXT1a: compressionOptions.setFormat(nvtt::Format_DXT1a); break;
                        case kDXT3:  compressionOptions.setFormat(nvtt::Format_DXT3); break;
                        case kDXT5:  compressionOptions.setFormat(nvtt::Format_DXT5); break;
                        default: assert(0);
                    }

                    nvtt::InputOptions inputOptions;
                    inputOptions.setTextureLayout(nvtt::TextureType_2D, inWidth, inHeight);
                    inputOptions.setFormat(nvtt::InputFormat_BGRA_8UB);
                    inputOptions.setMipmapGeneration(false);
                    inputOptions.setMipmapData( inData, inWidth, inHeight );//, 1, 0, 0 );

                    nvtt::Compressor compressor;
                    compressor.enableCudaAcceleration(true);
                    static bool cudaAccelerated;
                    //compressor.enableCudaAcceleration(false);
                    cudaAccelerated = compressor.isCudaAccelerationEnabled();
                    printf( "cudaAccelerated = %d\n", cudaAccelerated );
                    int estimatedSize = compressor.estimateSize(inputOptions, compressionOptions);

                    dxtcImg->pixels[face][mipLevel] = new byte[estimatedSize];

                    Image_nvttOutputHandler outputHandler( dxtcImg->pixels[face][mipLevel],
estimatedSize );
                    nvtt::OutputOptions outputOptions;
                    outputOptions.setOutputHandler( &outputHandler );

                    {
                        DEJA_CONTEXT("nvtt compress");
                        bool result = compressor.process( inputOptions, compressionOptions,
outputOptions );
                        printf("result = %d\n", result);
                        hr = result ? S_OK : S_FALSE;
                    }
                }
                else // Old way
                {
                    DEJA_CONTEXT("nvDXTcompressBGRA");
                    hr = nvDXTcompressBGRA( inData, inWidth, inHeight, inWidth * channelCount,
&options, channelCount, Image_DxtcMipCallback, NULL );
                }

Original comment by mal...@gmail.com on 17 Apr 2009 at 9:43

[GoogleCodeExporter]

This is now fixed in trunk. Sorry, this was a regression in trunk only and was 
fixed
in the 2.0 branch already. Closing now.

Original comment by cast...@gmail.com on 21 Sep 2009 at 6:46

• Changed state: Fixed

[GoogleCodeExporter]

Thanks!

Original comment by mal...@gmail.com on 5 Oct 2009 at 9:09