Function OverrideTextureBcFormat

tools/cli/NtcCommandLine.cpp:657–699

}

void OverrideTextureBcFormat(ntc::ITextureMetadata* texture, ManifestEntry* manifestEntry)
{
    // Override the BC format from command line, if specified.
    // Overriding with 'none' is also an option here.
    if (g_options.bcFormat.has_value())
    {
        ntc::BlockCompressedFormat bcFormat = *g_options.bcFormat;

        // Automatic selection of BCn mode based on channel count and HDR-ness
        if (bcFormat == BlockCompressedFormat_Auto)
        {
            ntc::ChannelFormat const channelFormat = texture->GetChannelFormat();
            if (channelFormat == ntc::ChannelFormat::FLOAT16 || channelFormat == ntc::ChannelFormat::FLOAT32)
            {
                // HDR textures use only BC6, no other options
                bcFormat = ntc::BlockCompressedFormat::BC6;
            }
            else
            {
                // Best quality options.
                // If you want more control, use a manifest.
                int const channels = texture->GetNumChannels();
                switch(channels)
                {
                    case 1:  bcFormat = ntc::BlockCompressedFormat::BC4; break;
                    case 2:  bcFormat = ntc::BlockCompressedFormat::BC5; break;
                    default: bcFormat = ntc::BlockCompressedFormat::BC7; break;
                }       
            }
        }

        assert(bcFormat != BlockCompressedFormat_Auto);

        texture->SetBlockCompressedFormat(bcFormat);

        // Apply the same override to the manifest entry, if it's provided
        // (in case the user wants to save the manifest)
        if (manifestEntry)
        {
            manifestEntry->bcFormat = bcFormat;
        }
    }
}

ntc::ITextureSet* LoadImages(ntc::IContext* context, Manifest& manifest, bool manifestIsGenerated)
{