Fast ISPC Texture Compressor

Texture compression for BC1-BC7, ETC1 and ASTC.

Uses ISPC compiler.

See Fast ISPC Texture Compressor post on Intel Developer Zone and the included Technical Paper.

Supported compression formats

Strenghts

Compression speed runtime adjustable over two magnitudes, making this library suitable for fast iteration and production use.
BC7 texture compression.
Visual demonstration tools included.

Limitations

Lack of notion about user intended colorspaces or compression metrics (sRGB is assumed for LDR input).
Limited input formats:
- BC6H requires clamped fp16 input.
- Otherwise 8 and 16 bit uint only.
Very basic support for BC3 alpha channel and BC4/BC5.
BC1 lacks punchthrough alpha support.
Only unsigned format of BC4/BC5/BC6H is supported.
ASTC is LDR only and won't support block sizes above 8x8.
Lack of documentation.
No decompression support.
No unit testing.

License

ISPC Texture Compressor is distributed under the MIT License.

Build Instructions

Using a later ispc version results in library not running on at least AMD Phenom II on Windows 7. This may or may not be a configuration issue in this project.

Windows:
- Use Visual Studio 2012 on later, build solution or project files.
- ISPC version 1.8.2 is included in this repo.
Mac OS X (outdated):
- Xcode project file included only for compressor itself, not for the examples.
- You'll need to get ISPC compiler version 1.8.2 build and put the compiler executable into ISPC Texture Compressor/ispc_osx.
- Use ISPC Texture Compressor/ispc_texcomp.xcodeproj, tested with Xcode 7.3.
- Minimum OS X deployment version set to 10.9.
- dylib install name is set to @executable_path/../Frameworks/$(EXECUTABLE_PATH)
Linux:
- Makefile included only for compressor itself, not for the examples.
- You'll need to get ISPC compiler version 1.8.2 build and put the compiler executable into ISPC Texture Compressor/ispc_linux.
- make -f Makefile.linux from ISPC Texture Compressor folder.