mirror of
https://github.com/yuzu-emu/FasTC
synced 2024-11-22 16:33:41 +00:00
116 lines
5.2 KiB
Markdown
116 lines
5.2 KiB
Markdown
FasTC [](https://travis-ci.org/Mokosha/FasTC)
|
|
=======
|
|
|
|
A <b>Fas</b>t <b>T</b>exture <b>C</b>ompressor for a variety of formats. This compressor
|
|
supports multi-threading via native Win32 threads on Windows and pthreads on other
|
|
operating systems. It has been tested on Windows, OS X, and Ubuntu Linux.
|
|
|
|
---
|
|
|
|
Requirements:
|
|
--------------
|
|
|
|
[CMake](http://www.cmake.org) (2.8.8) <br>
|
|
[libpng](http://www.libpng.org/pub/png/libpng.html) (1.5.13) <br>
|
|
[zlib](http://www.zlib.net) (1.2.5)
|
|
|
|
Installation:
|
|
--------------
|
|
|
|
FasTC uses [CMake](http://www.cmake.org/) to generate build files. The best way to do so is to
|
|
create a separate build directory for compilation:
|
|
|
|
mkdir FasTC
|
|
cd FasTC
|
|
git clone git@github.com:Mokosha/FasTC.git src
|
|
mkdir build
|
|
cd build
|
|
cmake ../src -DCMAKE_BUILD_TYPE=Release
|
|
make
|
|
|
|
Once you do this you will be able to run some examples.
|
|
|
|
#### Using Visual Studio on Windows ####
|
|
Due to the C/C++ runtime requirements in Visual Studio, you must have a compiled version of
|
|
each library that you wish to link to. In order to save time, I have uploaded various versions
|
|
of libpng, and zlib to a submodule in the source directory. Before running the steps above,
|
|
make sure to instantiate the submodule in git:
|
|
|
|
cd FasTC/src
|
|
git submodule init
|
|
git submodule update
|
|
|
|
This will download all of the Release versions of the necessary libraries (which means there will
|
|
be linker warnings during the build process under the Debug configuration). I have compiled
|
|
versions for Visual Studio 2008, 2010, and 2012.
|
|
|
|
Testing:
|
|
--------------
|
|
|
|
Once the compressor is built, you may test it against any images you wish as long as their dimensions
|
|
are supported by the compression format and they are in the png file format. If you'd like to convert
|
|
from one format to another, I suggest taking a look at [ImageMagick](http://www.imagemagick.org/script/index.php)
|
|
|
|
The quickest test will be to simply run the compressor on a PNG image:
|
|
|
|
cd FasTC/build
|
|
make
|
|
CLTool/tc path/to/image.png
|
|
|
|
This will compress `image.png` into the BPTC (BC7) format using 50 steps of simulated annealing without
|
|
SIMD optimization or multithreading.
|
|
|
|
There are various run-time options available:
|
|
|
|
* `-v`: Enabled verbosity, which reports Entropy, Mean Local Entropy, and MSSIM in addition to
|
|
compression time and PSNR.
|
|
* `-f <fmt>`: Specifies the format use for compression. `fmt` can be any one of the following:
|
|
* [BPTC](http://www.opengl.org/registry/specs/ARB/texture_compression_bptc.txt) (**Default**)
|
|
* [ETC1](http://www.khronos.org/registry/gles/extensions/OES/OES_compressed_ETC1_RGB8_texture.txt) [1]
|
|
* [DXT1](http://www.opengl.org/registry/specs/EXT/texture_compression_s3tc.txt) [2]
|
|
* [DXT5](http://www.opengl.org/registry/specs/EXT/texture_compression_s3tc.txt) [2]
|
|
* [PVRTC](http://web.onetel.net.uk/~simonnihal/assorted3d/fenney03texcomp.pdf)
|
|
* `-d`: Specifies the decompressed output file.
|
|
* **Default**: `<filename>`-`<fmt>`.png
|
|
* `-nd`: Suppress decompressed output.
|
|
* `-t`: Specifies the number of threads to use for compression.
|
|
* **Default**: 1
|
|
* **Formats**: BPTC, ETC1, DXT1, DXT5
|
|
* `-l`: Save an output log of various statistics during compression. This is mostly only useful for
|
|
debugging.
|
|
* **Formats**: BPTC
|
|
* `-q <num>`: Use `num` steps of simulated annealing during each endpoint compression. Default is 50.
|
|
Available only for BPTC.
|
|
* **Default**: 50
|
|
* **Formats**: BPTC
|
|
* `-n <num>`: Perform `num` compressions in a row. This is good for testing metrics.
|
|
* **Default**: 1
|
|
* **Formats**: All
|
|
* `-a`: Use a parallel algorithm that uses Fetch-And-Add and Test-And-Set to perform mutual exclusion
|
|
and avoid synchronization primitives. This algorithm is very useful when compressing a list of textures.
|
|
Cannot be used with the `-j` option.
|
|
* **Formats**: BPTC
|
|
* `-j <num>`: This specifies the number of blocks that the compressor will request to crunch per thread. If this
|
|
flag is not specified or set to zero, the image will be split up so that each thread compresses an
|
|
equal share. However, for many images, certain blocks compress faster than others, and you might want
|
|
a more fine grained control over how to switch between compressing different blocks.
|
|
* **Formats**: BPTC, ETC1, DXT1, DXT5
|
|
|
|
As an example, if I wanted to test compressing a texture using no simulated annealing, 4 threads, and 32 blocks per job,
|
|
I would invoke the following command:
|
|
|
|
CLTool/tc -q 0 -t 4 -j 32 path/to/image.png
|
|
|
|
If I wanted to compress a texture with the default amount of simulated annealing 100 times using the parallel algorithm
|
|
with atomic synchronization primitives, I would invoke the following command:
|
|
|
|
CLTool/tc -n 100 -a path/to/image.png
|
|
|
|
|
|
If I wanted to compress a texture into PVRTC, I would invoke the following command:
|
|
|
|
CLTool/tc -f PVRTC path/to/image.png
|
|
|
|
[1] Compression code courtesy of [Rich Geldreich](https://code.google.com/p/rg-etc1/) <br>
|
|
[2] Compression code courtesy of [Intel](http://software.intel.com/en-us/vcsource/samples/fast-texture-compression).
|
|
The idea implemented in this compressor was originally designed by [J. M. P. Van Waveren](http://www.gamedev.no/projects/MegatextureCompression/324337_324337.pdf)
|