5 Commits

Author	SHA1	Message	Date
Rich Geldreich	f631b29a7e	Frontend optimizations: Adding multiple compression levels to the encoder's frontend. Level 2 and 4 are equivalent to the initial release (default or -slower). Level 1 is now the new default, and is on average 21% faster than level 2. (Or more, up to 2-2.5x, on large images.) The help text documents what encoder features are used in each level. Level 0 is fine for most images, but is weak on artificial images and really large complex images. -slower now sets level 2 (not 4). ... Adding -only_etc1 command line option, because sometimes during unpack you only want the ETC1 images. Total timing and avg. Y PSNR across 59 test images, quality 128: L Time PSNR 0 121.4 35.45 1 172.4 36.87 2 216.0 37.13 3 511.4 37.15 4 665.9 37.41 5 1483.4 37.43 Initial release: L Time PSNR 0 216.77 37.13 1 701.84 37.41	2019-05-31 15:14:58 -07:00
Rich Geldreich	00b5c254ab	Encoder frontend fix: Setting unquantized ETC1S selectors (that got stomped in the previous optimization).	2019-05-29 16:57:59 -07:00
Rich Geldreich	3050ca4a70	Optimizing basisu_frontend::init_endpoint_training_vectors() so it doesn't go recompute the ETC1S block basecolor/inten tables again. We already do this in basisu_frontend::init_etc1_images(). This change should not change the output files in any way.	2019-05-29 12:11:48 -07:00
Rich Geldreich	130eb9f115	Major compression performance/quality improvements, for a 15-35% or so decrease in file size for the same Y PSNR/SSIM. The basis file format has changed due to these optimizations. ... Increasing the max codebook size to 16K vs. 8K, for a major increase in the max achievable quality. Adding exception catching to command line tool. Enabling debug iterators on MSVC. Refining command line options, adding "-individual" flag to create multiple .basis files (vs. a texture array). Changing default colorspace to sRGB, because that's probably the best default. -linear disables this and uses linear colorspace metrics. PNG reader in 32-bit builds checks the size of the file before loading to avoid out of memory exceptions.	2019-05-07 15:52:54 -07:00
Rich Geldreich	fb07f0e805	Initial checkin. Compiles with Visual Studio 2019, or under Ubuntu Linux using either clang 3.8 or gcc 5.4.	2019-04-29 18:50:54 -07:00