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Rich Geldreich
2019-05-10 22:35:14 -07:00
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@@ -63,7 +63,7 @@ Note that I was unable to disable assertions when compiling the transcoder in re
The transcoder unpacks .basis files to various GPU texture formats, almost always without needing to decompress entire images at the pixel level (i.e. it only deals with arrays of blocks). The one exception is PVRTC1, where the transcoder needs to recompute the per-pixel selector ("modulation") values, but it does so using simple scalar operations.
To use .basis files in an application, you only need the files in the "transcoder" directory. The entire transcoder lives in a single .cpp file: transcoder/basisu_transcoder.cpp. If compiling with gcc/clang, be sure strict aliasing is disabled when compiling this file, as I have not tested either the encoder or transcoder with strict aliasing enabled: -fno-strict-aliasing (The Linux kernel is also compiled with this option.)
To use .basis files in an application, you only need the files in the "transcoder" directory. The entire transcoder lives in a single .cpp file: transcoder/basisu_transcoder.cpp. If compiling with gcc/clang, be sure strict aliasing is disabled when compiling this file, as I have not tested either the encoder or transcoder with strict aliasing enabled: -fno-strict-aliasing (The Linux kernel is also compiled with this option.) The transcoder can also be cross compiled using emscripten (emcc), for web use.
To use the transcoder, #include "transcoder/basisu_transcoder.h". Call `basist::basisu_transcoder_init()` a single time (probably at startup). Also, ideally once at startup, you need to create a single instance of the `basist::etc1_global_selector_codebook` class, like this: