Update README.md
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@@ -60,7 +60,7 @@
### Command Line Compression Tool
-The command line tool used to create, validate, and transcode/unpack .basis files is named "basisu". Run basisu without any parameters for help.
+The command line tool used to create, validate, and transcode/unpack .basis/.KTX2 files is named "basisu". Run basisu without any parameters for help.
To build basisu (without SSE 4.1 support - the default):
@@ -131,10 +131,12 @@
You can either use the command line tool or [call the transcoder directly](https://github.com/BinomialLLC/basis_universal/wiki/How-to-Use-and-Configure-the-Transcoder) from JavaScript or C/C++ code to decompress .basis/.KTX2 files to GPU texture data or uncompressed images.
-To use the command line tool to unpack a .basis file to multiple .png/.ktx files:
+To use the command line tool to unpack a .basis or .KTX2 file to multiple .png/.ktx files:
`basisu x.basis`
+Use the `-no_ktx` and `-etc1_only` options to unpack to less files. `-info` and `-validate` will just display file information and not output any files. The output .KTX1 files are currently in the KTX1 file format, not KTX2.
+
The mipmapped or cubemap .KTX files will be in a wide variety of compressed GPU texture formats (PVRTC1 4bpp, ETC1-2, BC1-5, BC7, etc.), and to my knowledge there is no single .KTX viewer tool that correctly and reliably supports every GPU texture format that we support. BC1-5 and BC7 files are viewable using AMD's Compressonator, ETC1/2 using Mali's Texture Compression Tool, and PVRTC1 using Imagination Tech's PVRTexTool. Links:
[Mali Texture Compression Tool](https://developer.arm.com/tools-and-software/graphics-and-gaming/graphics-development-tools/mali-texture-compression-tool)
