From 52e065d66a41f87bd925aac2cd9e39754b05b3e7 Mon Sep 17 00:00:00 2001 From: Ignacio Date: Sat, 4 Apr 2020 10:21:00 -0700 Subject: [PATCH] Update benchmark with rgbcx. --- extern/rg/rgbcx.h | 2401 +++++++++++++++++++++++++++++++++++++ src/nvtt/tests/bc1enc.cpp | 199 +-- 2 files changed, 2518 insertions(+), 82 deletions(-) create mode 100644 extern/rg/rgbcx.h diff --git a/extern/rg/rgbcx.h b/extern/rg/rgbcx.h new file mode 100644 index 0000000..94f4bbf --- /dev/null +++ b/extern/rg/rgbcx.h @@ -0,0 +1,2401 @@ +// rgbcx.h +// High-performance scalar BC1-5 encoders. Public Domain or MIT license (you choose - see below), written by Richard Geldreich 2020 . +// Influential references: +// http://sjbrown.co.uk/2006/01/19/dxt-compression-techniques/ +// https://github.com/nothings/stb/blob/master/stb_dxt.h +// https://gist.github.com/castano/c92c7626f288f9e99e158520b14a61cf +// +// This is a single header file library. Be sure to "#define RGBCX_IMPLEMENTATION" in one .cpp file somewhere. +// +// encode_bc1_init() MUST be called before encoding any blocks. +// +#ifndef RGBCX_INCLUDE_H +#define RGBCX_INCLUDE_H + +#include +#include +#include +#include +#include + +namespace rgbcx +{ + // Encode_bc1_init() MUST be called once before using the BC1 encoder. + void encode_bc1_init(); + + void encode_bc1_solid_block(void* pDst, uint32_t fr, uint32_t fg, uint32_t fb); + + enum + { + cEncodeBC1UsePCA = 1, + cEncodeBC1UseLikelyTotalOrderings = 2, + cEncodeBC1HighQuality = 4 + }; + + // Level 0 is similar to stb_dxt default quality. + const uint32_t LEVEL0_OPTIONS = cEncodeBC1UsePCA; + // Level 0 is similar to stb_dxt HIGHQUAL. + const uint32_t LEVEL1_OPTIONS = cEncodeBC1UsePCA | cEncodeBC1HighQuality; + // Level 2 allows the quality to smoothly vary, from slightly higher than level 1 all the way up to around libsquish. Use total_orderings_to_try to [1,32] to vary quality vs. performance. + const uint32_t LEVEL2_OPTIONS = cEncodeBC1UsePCA | cEncodeBC1HighQuality | cEncodeBC1UseLikelyTotalOrderings; + const uint32_t DEFAULT_OPTIONS = LEVEL2_OPTIONS; + + const uint32_t MIN_TOTAL_ORDERINGS = 1; + const uint32_t MAX_TOTAL_ORDERINGS = 32; + + // DEFAULT_TOTAL_ORDERINGS_TO_TRY is around 2x faster than libsquish at slightly higher average quality. + const uint32_t DEFAULT_TOTAL_ORDERINGS_TO_TRY = 16; + + // Encodes a block of 4x4 pixels to BC1 format. + // Always returns a 4 color block, no transparency supported. + // total_orderings_to_try controls the perf. vs. quality tradeoff when the cEncodeBC1UseLikelyTotalOrderings flag is used. + void encode_bc1(void* pDst, const uint8_t* pPixels, uint32_t flags = LEVEL2_OPTIONS, uint32_t total_orderings_to_try = DEFAULT_TOTAL_ORDERINGS_TO_TRY); + + void encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride = 4); + void encode_bc3(void* pDst, const uint8_t* pPixels, uint32_t flags= LEVEL2_OPTIONS, uint32_t total_orderings_to_try = DEFAULT_TOTAL_ORDERINGS_TO_TRY); + void encode_bc5(void* pDst, const uint8_t* pPixels, uint32_t chan0 = 0, uint32_t chan1 = 1, uint32_t stride = 4); + + // Returns true if the block uses 3 color punchthrough alpha mode. + bool unpack_bc1(const void* pBlock_bits, void* pPixels, bool set_alpha = true); + void unpack_bc4(const void* pBlock_bits, uint8_t* pPixels, uint32_t stride = 4); + bool unpack_bc3(const void* pBlock_bits, void* pPixels); + void unpack_bc5(const void* pBlock_bits, void* pPixels, uint32_t chan0 = 0, uint32_t chan1 = 1, uint32_t stride = 4); +} +#endif // #ifndef RGBCX_INCLUDE_H + +#ifdef RGBCX_IMPLEMENTATION +namespace rgbcx +{ + const uint32_t NUM_UNIQUE_TOTAL_ORDERINGS = 969; + + // All total orderings for 16 pixels 2-bit selectors. + static uint8_t g_unique_total_orders[NUM_UNIQUE_TOTAL_ORDERINGS][4] = + { + {0,8,2,6},{4,3,9,0},{4,8,1,3},{12,0,3,1},{11,3,2,0},{6,4,6,0},{7,5,0,4},{6,0,8,2},{1,0,0,15},{3,0,8,5},{1,1,13,1},{13,1,2,0},{0,14,1,1},{0,15,1,0},{0,13,0,3},{16,0,0,0},{4,3,4,5},{8,6,0,2},{0,10,0,6},{10,0,4,2},{7,2,1,6},{4,7,5,0},{1,4,7,4},{0,14,2,0},{2,7,2,5},{9,0,5,2},{9,2,2,3},{10,0,5,1},{2,3,7,4},{4,9,0,3},{1,5,0,10},{1,1,6,8}, + {6,6,4,0},{11,5,0,0},{11,2,0,3},{4,0,10,2},{2,3,10,1},{1,13,1,1},{0,14,0,2},{2,3,3,8},{12,3,1,0},{14,0,0,2},{9,1,3,3},{6,4,0,6},{1,1,5,9},{5,9,0,2},{2,10,1,3},{12,0,0,4},{4,6,6,0},{0,6,4,6},{3,7,4,2},{0,13,3,0},{3,10,0,3},{10,2,1,3},{1,12,1,2},{2,0,13,1},{11,0,5,0},{12,1,3,0},{6,4,5,1},{10,4,2,0},{3,6,1,6},{7,3,6,0},{10,4,0,2},{10,0,2,4}, + {0,5,9,2},{0,9,3,4},{6,4,2,4},{3,4,7,2},{3,3,5,5},{4,2,9,1},{6,2,8,0},{3,5,3,5},{4,10,1,1},{10,1,3,2},{5,7,0,4},{5,3,7,1},{6,8,1,1},{8,8,0,0},{11,1,0,4},{14,1,0,1},{9,3,2,2},{8,2,1,5},{0,0,2,14},{3,3,9,1},{10,1,5,0},{8,3,1,4},{1,5,8,2},{6,1,9,0},{3,2,1,10},{3,11,1,1},{7,6,3,0},{9,0,3,4},{5,2,5,4},{0,2,3,11},{15,0,0,1},{0,6,6,4}, + {3,4,9,0},{4,7,0,5},{0,4,4,8},{0,13,2,1},{2,4,1,9},{3,2,5,6},{10,6,0,0},{3,5,6,2},{8,0,4,4},{1,3,6,6},{7,7,0,2},{6,1,4,5},{0,11,1,4},{2,2,8,4},{0,1,2,13},{15,0,1,0},{7,2,6,1},{8,1,7,0},{1,8,4,3},{2,13,1,0},{1,0,7,8},{14,2,0,0},{1,8,1,6},{9,3,3,1},{0,0,7,9},{4,4,1,7},{9,0,6,1},{10,2,4,0},{1,7,3,5},{0,3,8,5},{5,2,4,5},{1,2,5,8}, + {0,8,7,1},{10,3,2,1},{12,0,4,0},{2,1,4,9},{5,2,2,7},{1,9,3,3},{15,1,0,0},{6,3,4,3},{9,5,0,2},{1,6,9,0},{6,6,0,4},{13,2,1,0},{5,1,8,2},{0,5,11,0},{7,1,0,8},{1,2,12,1},{0,3,3,10},{7,4,2,3},{5,1,4,6},{7,0,3,6},{3,12,0,1},{3,4,5,4},{1,10,0,5},{7,4,3,2},{10,5,0,1},{13,3,0,0},{2,5,4,5},{3,10,1,2},{5,1,2,8},{14,0,1,1},{1,5,4,6},{1,4,5,6}, + {2,3,11,0},{11,0,4,1},{11,2,2,1},{5,3,8,0},{1,3,10,2},{0,1,13,2},{3,1,4,8},{4,2,4,6},{1,5,6,4},{2,1,11,2},{1,2,9,4},{4,7,3,2},{6,2,5,3},{7,2,2,5},{8,1,4,3},{3,2,8,3},{12,1,0,3},{7,8,1,0},{7,0,2,7},{5,10,0,1},{0,2,14,0},{2,9,3,2},{7,0,0,9},{11,1,4,0},{10,4,1,1},{2,2,9,3},{5,7,2,2},{1,3,1,11},{13,2,0,1},{4,2,8,2},{2,3,1,10},{4,2,5,5}, + {7,0,7,2},{10,0,0,6},{0,8,5,3},{4,4,0,8},{12,4,0,0},{0,1,14,1},{8,0,1,7},{5,1,5,5},{11,0,3,2},{0,4,1,11},{0,8,8,0},{0,2,5,9},{7,3,2,4},{7,8,0,1},{1,0,3,12},{7,4,5,0},{1,6,7,2},{7,6,1,2},{9,6,1,0},{12,2,0,2},{4,1,6,5},{4,0,1,11},{8,4,4,0},{13,0,1,2},{8,6,2,0},{4,12,0,0},{2,7,5,2},{2,0,5,9},{5,4,5,2},{3,8,5,0},{7,3,3,3},{4,4,8,0}, + {2,1,3,10},{5,0,1,10},{6,4,3,3},{4,9,1,2},{1,4,0,11},{11,3,1,1},{4,0,12,0},{13,0,0,3},{6,1,6,3},{9,0,4,3},{8,0,0,8},{8,4,0,4},{0,12,1,3},{0,4,10,2},{3,4,8,1},{1,3,8,4},{9,2,5,0},{5,7,4,0},{1,0,11,4},{4,10,0,2},{1,3,12,0},{6,9,0,1},{5,0,9,2},{5,9,2,0},{13,1,0,2},{9,3,4,0},{9,4,0,3},{3,1,12,0},{2,4,3,7},{1,2,13,0},{2,2,4,8},{6,8,0,2}, + {9,2,1,4},{9,5,1,1},{2,0,4,10},{5,4,0,7},{0,0,6,10},{1,2,0,13},{4,7,2,3},{6,5,5,0},{3,3,1,9},{1,6,1,8},{12,2,1,1},{4,4,5,3},{1,0,6,9},{0,6,10,0},{4,8,3,1},{4,3,2,7},{2,1,7,6},{1,9,1,5},{3,1,3,9},{8,7,1,0},{1,2,3,10},{14,1,1,0},{5,4,4,3},{3,7,0,6},{7,4,1,4},{3,7,5,1},{1,1,0,14},{0,10,3,3},{0,4,3,9},{1,7,7,1},{2,0,10,4},{5,8,0,3}, + {6,7,3,0},{0,8,4,4},{5,7,3,1},{7,9,0,0},{7,6,2,1},{0,4,5,7},{6,3,5,2},{1,2,1,12},{5,2,0,9},{8,5,0,3},{4,6,1,5},{1,1,7,7},{10,5,1,0},{1,2,8,5},{1,8,2,5},{5,1,0,10},{6,9,1,0},{13,0,2,1},{8,3,5,0},{6,3,6,1},{2,11,3,0},{3,7,3,3},{1,5,2,8},{7,5,2,2},{0,6,7,3},{13,1,1,1},{5,3,4,4},{7,2,7,0},{5,8,3,0},{3,13,0,0},{0,7,9,0},{8,0,3,5}, + {1,3,7,5},{4,0,2,10},{12,0,1,3},{1,7,6,2},{3,9,0,4},{7,2,0,7},{0,1,7,8},{2,1,8,5},{0,13,1,2},{0,8,1,7},{5,0,11,0},{5,6,2,3},{0,3,0,13},{2,3,4,7},{5,6,3,2},{4,2,10,0},{3,3,7,3},{7,2,5,2},{1,1,11,3},{12,3,0,1},{5,1,1,9},{1,15,0,0},{9,7,0,0},{9,1,2,4},{0,7,3,6},{3,0,13,0},{3,0,11,2},{0,6,5,5},{8,2,2,4},{6,10,0,0},{4,8,4,0},{0,0,3,13}, + {0,4,12,0},{7,1,6,2},{3,5,0,8},{8,0,6,2},{6,2,3,5},{2,10,0,4},{4,11,0,1},{6,1,5,4},{5,1,3,7},{0,11,3,2},{4,6,0,6},{2,6,0,8},{3,1,7,5},{2,14,0,0},{2,9,2,3},{0,3,4,9},{11,0,1,4},{13,0,3,0},{8,3,0,5},{0,5,3,8},{5,11,0,0},{0,1,4,11},{2,1,9,4},{3,4,4,5},{7,1,2,6},{12,2,2,0},{9,4,1,2},{6,0,2,8},{4,6,2,4},{11,2,3,0},{3,2,2,9},{10,3,1,2}, + {1,1,2,12},{0,5,2,9},{0,1,11,4},{6,2,4,4},{2,8,2,4},{0,9,4,3},{11,0,2,3},{0,2,11,3},{6,0,7,3},{0,3,6,7},{4,5,5,2},{1,2,6,7},{7,5,1,3},{9,0,2,5},{2,6,4,4},{4,1,9,2},{4,8,2,2},{1,12,3,0},{0,9,6,1},{0,10,6,0},{3,1,5,7},{2,13,0,1},{2,2,1,11},{3,6,0,7},{5,6,5,0},{5,5,4,2},{4,0,3,9},{3,4,1,8},{0,11,2,3},{2,12,1,1},{7,1,3,5},{7,0,9,0}, + {8,0,8,0},{1,0,2,13},{3,3,10,0},{2,4,4,6},{2,3,8,3},{1,10,5,0},{7,3,0,6},{2,9,0,5},{1,4,6,5},{6,6,3,1},{5,6,0,5},{6,3,0,7},{3,10,2,1},{2,5,5,4},{3,8,4,1},{1,14,0,1},{10,3,3,0},{3,5,7,1},{1,1,3,11},{2,4,0,10},{9,3,1,3},{5,10,1,0},{3,0,6,7},{3,1,9,3},{11,2,1,2},{5,3,3,5},{0,5,1,10},{4,1,11,0},{10,2,0,4},{7,6,0,3},{2,7,0,7},{4,2,2,8}, + {6,1,7,2},{4,9,2,1},{0,0,8,8},{3,7,2,4},{9,6,0,1},{0,12,4,0},{6,7,1,2},{0,7,2,7},{1,0,10,5},{0,0,14,2},{2,7,3,4},{5,0,0,11},{7,7,1,1},{6,2,7,1},{4,5,3,4},{3,5,1,7},{5,9,1,1},{6,2,1,7},{3,2,0,11},{0,11,0,5},{3,11,2,0},{10,1,4,1},{7,0,4,5},{11,4,0,1},{10,3,0,3},{0,2,4,10},{0,15,0,1},{0,11,5,0},{6,7,2,1},{1,12,2,1},{4,1,3,8},{1,0,13,2}, + {1,8,5,2},{7,0,1,8},{3,12,1,0},{9,2,4,1},{1,7,4,4},{11,4,1,0},{4,3,8,1},{2,8,4,2},{1,11,3,1},{1,1,4,10},{4,10,2,0},{8,2,5,1},{1,0,9,6},{5,3,2,6},{0,9,7,0},{10,2,2,2},{5,8,1,2},{8,7,0,1},{0,3,12,1},{1,0,1,14},{4,8,0,4},{3,8,0,5},{4,6,5,1},{0,9,5,2},{10,2,3,1},{2,3,9,2},{1,0,12,3},{11,3,0,2},{4,5,2,5},{0,2,12,2},{9,1,0,6},{9,2,0,5}, + {1,2,7,6},{4,7,4,1},{0,12,2,2},{0,0,0,16},{2,8,3,3},{3,6,2,5},{0,6,3,7},{7,5,4,0},{3,3,3,7},{3,3,0,10},{5,0,6,5},{0,0,10,6},{8,5,3,0},{8,1,5,2},{6,0,9,1},{11,1,2,2},{2,11,2,1},{9,5,2,0},{3,0,4,9},{2,2,12,0},{2,6,6,2},{2,1,13,0},{6,0,5,5},{2,0,14,0},{2,11,1,2},{4,4,7,1},{2,0,11,3},{3,1,1,11},{2,9,4,1},{3,7,6,0},{14,0,2,0},{1,10,4,1}, + {8,0,7,1},{3,6,5,2},{0,3,11,2},{2,5,6,3},{11,1,3,1},{6,5,3,2},{3,8,1,4},{0,2,7,7},{2,10,2,2},{1,6,2,7},{11,0,0,5},{12,1,1,2},{12,1,2,1},{0,7,1,8},{0,3,9,4},{0,2,1,13},{7,1,4,4},{10,1,0,5},{4,0,8,4},{5,2,7,2},{0,2,0,14},{4,3,7,2},{2,7,1,6},{1,2,2,11},{6,3,3,4},{1,14,1,0},{2,4,6,4},{5,3,6,2},{5,3,5,3},{8,4,1,3},{1,3,0,12},{3,5,2,6}, + {1,8,7,0},{0,7,4,5},{2,1,6,7},{4,11,1,0},{7,2,4,3},{6,1,3,6},{4,5,4,3},{2,11,0,3},{1,5,7,3},{12,0,2,2},{5,0,4,7},{1,13,0,2},{7,7,2,0},{4,1,7,4},{4,5,0,7},{5,0,5,6},{6,5,4,1},{2,4,2,8},{1,10,1,4},{6,3,1,6},{3,3,8,2},{0,7,7,2},{4,4,2,6},{1,1,8,6},{1,12,0,3},{2,1,12,1},{1,9,2,4},{1,11,0,4},{2,5,2,7},{10,0,3,3},{4,6,3,3},{3,7,1,5}, + {1,9,0,6},{7,1,7,1},{1,6,5,4},{9,2,3,2},{6,2,2,6},{2,2,2,10},{8,3,3,2},{0,1,8,7},{2,0,8,6},{0,3,1,12},{9,4,2,1},{9,4,3,0},{6,2,6,2},{1,8,0,7},{5,1,10,0},{0,5,5,6},{8,2,4,2},{2,3,2,9},{6,0,3,7},{2,2,6,6},{2,6,2,6},{1,13,2,0},{9,3,0,4},{7,3,5,1},{6,5,2,3},{5,2,6,3},{2,0,12,2},{5,7,1,3},{8,1,3,4},{3,1,10,2},{1,0,15,0},{0,8,0,8}, + {5,0,7,4},{4,4,6,2},{0,1,0,15},{10,0,1,5},{7,3,4,2},{4,9,3,0},{2,5,7,2},{3,4,2,7},{8,3,2,3},{5,1,6,4},{0,10,2,4},{6,6,1,3},{6,0,0,10},{4,4,3,5},{1,3,9,3},{7,5,3,1},{3,0,7,6},{1,8,6,1},{4,3,0,9},{3,11,0,2},{6,0,6,4},{0,1,3,12},{0,4,2,10},{5,5,6,0},{4,1,4,7},{8,1,6,1},{5,6,4,1},{8,4,2,2},{4,3,1,8},{3,0,2,11},{1,11,4,0},{0,8,3,5}, + {5,1,7,3},{7,0,8,1},{4,3,5,4},{4,6,4,2},{3,2,4,7},{1,6,3,6},{0,7,8,1},{3,0,1,12},{9,1,4,2},{7,4,0,5},{1,7,0,8},{5,4,1,6},{9,1,5,1},{1,1,9,5},{4,1,1,10},{5,3,0,8},{2,2,5,7},{4,0,0,12},{9,0,7,0},{3,4,0,9},{0,2,6,8},{8,2,0,6},{3,2,6,5},{4,2,6,4},{3,6,4,3},{2,8,6,0},{5,0,3,8},{0,4,0,12},{0,16,0,0},{0,9,2,5},{4,0,11,1},{1,6,4,5}, + {0,1,6,9},{3,4,6,3},{3,0,10,3},{7,0,6,3},{1,4,9,2},{1,5,3,7},{8,5,2,1},{0,12,0,4},{7,2,3,4},{0,5,6,5},{11,1,1,3},{6,5,0,5},{2,1,5,8},{1,4,11,0},{9,1,1,5},{0,0,13,3},{5,8,2,1},{2,12,0,2},{3,3,6,4},{4,1,10,1},{4,0,5,7},{8,1,0,7},{5,1,9,1},{4,3,3,6},{0,2,2,12},{6,3,2,5},{0,0,12,4},{1,5,1,9},{2,6,5,3},{3,6,3,4},{2,12,2,0},{1,6,8,1}, + {10,1,1,4},{1,3,4,8},{7,4,4,1},{1,11,1,3},{1,2,10,3},{3,9,3,1},{8,5,1,2},{2,10,4,0},{4,2,0,10},{2,7,6,1},{8,2,3,3},{1,5,5,5},{3,1,0,12},{3,10,3,0},{8,0,5,3},{0,6,8,2},{0,3,13,0},{0,0,16,0},{1,9,4,2},{4,1,8,3},{1,6,6,3},{0,10,5,1},{0,1,12,3},{4,0,6,6},{3,8,3,2},{0,5,4,7},{1,0,14,1},{0,4,6,6},{3,9,1,3},{3,5,8,0},{3,6,6,1},{5,4,7,0}, + {3,0,12,1},{8,6,1,1},{2,9,5,0},{6,1,1,8},{4,1,2,9},{3,9,4,0},{5,2,9,0},{0,12,3,1},{1,4,10,1},{4,0,7,5},{3,1,2,10},{5,4,2,5},{5,5,5,1},{4,2,3,7},{1,7,5,3},{2,8,0,6},{8,1,2,5},{3,8,2,3},{6,1,2,7},{3,9,2,2},{9,0,0,7},{0,8,6,2},{8,4,3,1},{0,2,8,6},{6,5,1,4},{2,3,5,6},{2,10,3,1},{0,7,0,9},{4,2,7,3},{2,4,8,2},{7,1,1,7},{2,4,7,3}, + {2,4,10,0},{0,1,10,5},{4,7,1,4},{0,10,4,2},{9,0,1,6},{1,9,6,0},{3,3,4,6},{4,5,7,0},{5,5,2,4},{2,8,1,5},{2,3,6,5},{0,1,1,14},{3,2,3,8},{10,1,2,3},{9,1,6,0},{3,4,3,6},{2,2,0,12},{0,0,9,7},{4,0,9,3},{7,0,5,4},{4,5,6,1},{2,5,1,8},{2,5,9,0},{3,5,4,4},{1,3,11,1},{7,1,5,3},{3,2,7,4},{1,4,2,9},{1,11,2,2},{2,2,3,9},{5,0,10,1},{3,2,11,0}, + {1,10,3,2},{8,3,4,1},{3,6,7,0},{0,7,5,4},{1,3,3,9},{2,2,10,2},{1,9,5,1},{0,5,0,11},{3,0,3,10},{0,4,8,4},{2,7,7,0},{2,0,2,12},{1,2,11,2},{6,3,7,0},{0,6,2,8},{0,10,1,5},{0,9,0,7},{6,4,4,2},{6,0,1,9},{1,5,10,0},{5,4,6,1},{5,5,3,3},{0,0,4,12},{0,3,2,11},{1,4,1,10},{3,0,9,4},{5,5,0,6},{1,7,8,0},{2,0,3,11},{6,4,1,5},{10,0,6,0},{0,6,0,10}, + {0,4,11,1},{3,1,6,6},{2,5,8,1},{0,2,10,4},{3,1,11,1},{6,6,2,2},{1,1,10,4},{2,1,2,11},{6,1,8,1},{0,2,13,1},{0,7,6,3},{6,8,2,0},{3,0,0,13},{4,4,4,4},{6,2,0,8},{7,3,1,5},{0,11,4,1},{6,7,0,3},{2,6,3,5},{5,2,1,8},{7,1,8,0},{5,5,1,5},{1,8,3,4},{8,2,6,0},{6,0,10,0},{5,6,1,4},{1,4,4,7},{2,7,4,3},{1,4,8,3},{5,4,3,4},{1,10,2,3},{2,9,1,4}, + {2,2,11,1},{2,5,0,9},{0,0,1,15},{0,0,11,5},{0,4,7,5},{0,1,15,0},{2,1,0,13},{0,3,10,3},{8,0,2,6},{3,3,2,8},{3,5,5,3},{1,7,1,7},{1,3,2,10},{4,0,4,8},{2,0,9,5},{1,1,1,13},{2,2,7,5},{2,1,10,3},{4,2,1,9},{4,3,6,3},{1,3,5,7},{2,5,3,6},{1,0,8,7},{5,0,2,9},{2,8,5,1},{1,6,0,9},{0,0,5,11},{0,4,9,3},{2,0,7,7},{1,7,2,6},{2,1,1,12},{2,4,9,1}, + {0,5,7,4},{6,0,4,6},{3,2,10,1},{0,6,1,9},{2,6,1,7},{0,5,8,3},{4,1,0,11},{1,2,4,9},{4,1,5,6},{6,1,0,9},{1,4,3,8},{4,5,1,6},{1,0,5,10},{5,3,1,7},{0,9,1,6},{2,0,1,13},{2,0,6,8},{8,1,1,6},{1,5,9,1},{0,6,9,1},{0,3,5,8},{0,2,9,5},{5,2,8,1},{1,1,14,0},{3,2,9,2},{5,0,8,3},{0,5,10,1},{5,2,3,6},{2,6,7,1},{2,3,0,11},{0,1,9,6},{1,0,4,11}, + {3,0,5,8},{0,0,15,1},{2,4,5,5},{0,3,7,6},{2,0,0,14},{1,1,12,2},{2,6,8,0},{3,1,8,4},{0,1,5,10} + }; + + // For each total ordering, this table indices which other total orderings are likely to improve quality using a least squares pass. It's sorted by usefulness. + static uint16_t g_best_total_orderings[NUM_UNIQUE_TOTAL_ORDERINGS][32] = + { + { 202,120,13,318,15,23,403,450,5,51,260,128,77,21,33,494,515,523,4,141,269,1,2,700,137,49,48,102,7,64,753,82 }, + { 13,141,23,217,115,51,77,2,64,21,0,4,5,317,137,269,202,33,318,7,291,352,9,10,3,180,32,6,365,102,341,349 }, + { 29,58,262,1,52,74,6,171,5,287,151,334,27,500,75,26,331,223,53,635,220,19,50,45,46,17,14,396,163,409,324,70 }, + { 40,51,33,453,14,23,62,56,12,196,730,475,153,99,403,775,117,130,585,34,4,17,162,11,139,57,102,38,108,47,123,440 }, + { 33,23,51,13,102,64,202,128,12,40,15,196,153,10,1,2,77,99,141,0,515,5,117,3,120,403,700,165,22,14,269,453 }, + { 13,23,51,4,77,141,202,33,115,64,32,128,0,11,177,40,15,102,2,217,7,137,269,21,90,59,515,1,180,403,22,6 }, + { 26,235,19,47,648,624,78,145,27,112,122,64,444,6,630,453,25,42,65,130,711,85,390,113,416,108,665,29,730,138,644,95 }, + { 64,141,352,751,217,247,237,437,177,269,86,954,947,875,32,318,95,77,304,92,597,180,232,291,128,864,349,588,372,202,312,1 }, + { 642,898,180,638,901,341,82,197,10,951,15,515,165,762,700,253,811,753,752,365,143,479,244,569,8,110,351,873,55,31,499,116 }, + { 221,23,51,125,438,254,13,21,39,49,308,656,0,115,530,159,158,401,30,166,912,386,165,688,518,9,105,627,424,22,421,33 }, + { 143,31,1,44,197,8,180,125,116,55,13,498,23,341,638,242,93,15,2,141,0,901,752,115,36,206,165,479,338,365,515,762 }, + { 12,23,51,13,14,15,37,99,515,38,700,117,2,196,134,153,753,64,54,33,128,120,21,0,328,5,139,82,453,719,457,1 }, + { 13,15,23,515,961,700,457,753,51,115,4,165,197,2,38,569,1,474,0,37,99,719,5,12,629,14,11,3,33,77,64,10 }, + { 15,515,700,753,1,0,2,4,3,23,134,12,961,5,10,197,11,33,82,120,457,51,165,7,6,341,217,21,77,9,40,180 }, + { 13,51,23,457,719,961,730,401,165,453,0,117,386,15,134,1,758,153,12,54,515,99,11,2,700,5,753,4,308,33,6,899 }, + { 134,898,82,117,13,33,77,102,23,260,341,351,120,901,197,153,961,111,196,110,180,457,854,10,450,8,165,40,4,115,0,365 }, + { 60,18,126,167,35,16,191,71,24,92,121,271,68,107,212,146,118,150,199,7,21,1,9,575,727,5,566,48,0,132,108,273 }, + { 62,136,129,123,128,41,162,17,249,211,214,789,618,710,38,678,248,507,57,64,152,269,119,3,177,183,597,106,4,179,216,90 }, + { 403,523,51,475,494,453,817,899,202,23,450,13,421,120,102,730,33,128,4,1,805,5,7,153,757,260,318,196,77,457,326,65 }, + { 4,59,3,62,12,33,56,193,27,21,102,17,40,77,76,84,32,0,6,123,119,177,128,11,18,611,605,25,13,51,73,210 }, + { 43,20,319,422,414,945,0,7,819,61,5,376,325,173,804,904,470,693,97,707,14,49,22,104,147,107,95,32,426,1,330,577 }, + { 13,23,51,2,0,115,4,141,217,33,10,77,1,15,64,180,3,515,7,6,22,102,11,5,40,9,165,700,202,197,317,341 }, + { 28,49,0,105,1,24,65,159,35,55,95,239,16,2,109,7,9,14,170,320,347,168,424,158,10,301,124,5,67,21,64,36 }, + { 15,515,700,753,0,1,13,2,117,4,12,10,5,165,457,3,9,134,11,7,6,51,77,64,961,82,33,197,14,341,120,141 }, + { 7,71,14,149,97,18,60,16,150,92,398,189,140,124,24,273,35,2,69,302,154,68,0,336,517,43,66,28,118,251,230,1 }, + { 4,102,33,77,40,59,11,624,210,12,128,342,5,503,91,139,64,32,25,494,202,678,416,0,403,275,21,450,196,318,523,177 }, + { 25,19,42,6,122,813,256,235,85,26,436,53,297,573,680,390,445,63,27,416,80,233,65,73,389,283,45,605,194,17,250,343 }, + { 402,102,202,128,33,300,403,23,12,77,40,21,342,117,483,99,25,494,6,4,63,32,84,569,139,757,475,318,19,26,196,134 }, + { 158,9,0,109,39,49,65,22,35,168,55,24,68,124,159,16,185,344,333,154,254,272,175,289,1,577,95,28,105,810,30,169 }, + { 197,180,115,237,498,165,2,5,287,546,400,3,61,34,509,13,297,80,341,52,45,186,58,881,23,873,468,176,64,17,311,250 }, + { 120,968,373,260,704,110,450,202,137,318,77,95,269,326,217,717,661,652,851,349,93,1,518,98,827,291,21,177,82,33,848,719 }, + { 44,116,144,268,434,489,367,384,98,127,918,93,948,31,206,940,855,0,203,137,9,22,617,141,332,105,393,492,959,282,299,131 }, + { 13,77,23,33,51,0,64,141,102,4,2,115,1,6,202,15,10,128,269,7,177,180,3,40,22,11,515,217,117,318,700,137 }, + { 15,515,700,753,4,11,141,40,165,23,64,180,13,202,32,3,51,125,5,197,21,128,0,93,77,1,120,82,269,117,110,59 }, + { 176,231,585,62,34,14,412,161,56,236,527,57,17,3,51,202,4,23,369,283,128,13,472,440,84,361,136,457,381,130,719,53 }, + { 9,0,180,217,237,101,141,352,88,100,230,64,175,317,115,498,68,39,30,1,702,83,213,36,365,208,752,13,252,321,952,546 }, + { 28,9,22,1,49,0,109,39,83,95,86,30,13,105,128,55,141,168,158,67,31,159,208,12,96,5,185,2,160,64,137,23 }, + { 72,4,38,12,51,89,477,11,57,76,401,308,23,474,99,148,413,179,59,13,431,152,54,569,17,3,205,629,197,421,405,15 }, + { 457,13,23,961,15,51,515,700,165,12,753,629,11,1,719,117,0,3,2,37,569,197,40,328,33,5,153,134,99,64,38,196 }, + { 254,100,310,9,30,1,39,625,166,265,190,0,272,557,131,731,31,98,578,688,404,93,101,88,49,21,127,264,44,36,252,478 }, + { 51,23,12,13,15,128,99,120,10,202,515,153,64,82,700,33,165,2,5,117,403,1,141,0,3,196,37,453,753,197,260,93 }, + { 38,99,542,139,453,117,196,23,457,13,328,111,37,134,961,11,12,51,40,775,587,401,474,54,153,477,41,629,33,475,14,277 }, + { 6,85,25,233,343,91,26,63,138,29,19,65,283,4,81,235,42,122,605,64,648,256,174,370,74,389,718,59,45,194,445,416 }, + { 49,5,97,20,197,21,18,193,0,64,408,729,173,350,43,422,165,7,14,104,61,32,509,713,523,102,120,95,125,397,35,232 }, + { 144,116,268,434,384,489,367,206,93,855,940,44,98,332,617,127,959,911,137,282,203,31,22,219,141,9,131,276,417,0,1,120 }, + { 17,106,64,62,32,255,136,292,476,162,129,241,123,141,41,237,720,214,209,352,519,211,186,148,752,247,507,90,21,77,197,119 }, + { 2,29,52,50,5,58,14,6,27,1,366,357,45,53,17,19,171,151,26,181,133,38,218,764,287,583,61,113,3,487,600,281 }, + { 130,59,196,412,381,730,711,236,77,210,202,402,453,99,401,108,361,803,291,283,153,4,57,51,128,183,14,719,503,117,23,11 }, + { 13,23,51,141,77,4,33,64,115,0,217,10,180,202,2,102,11,9,15,165,40,21,128,352,22,7,197,3,317,515,269,1 }, + { 23,13,202,51,120,15,21,5,141,1,128,269,137,515,64,102,125,48,98,33,260,523,318,93,700,165,450,77,2,12,403,82 }, + { 1,2,14,46,29,67,38,52,5,171,58,24,103,69,96,70,83,181,54,75,163,223,16,45,112,309,155,0,186,35,18,108 }, + { 15,515,700,753,13,0,1,2,153,5,23,10,117,3,9,7,134,165,12,6,341,33,4,14,77,457,115,21,719,180,217,82 }, + { 197,165,509,13,391,180,308,115,23,546,5,498,2,29,3,401,901,61,34,80,14,457,250,569,237,873,38,297,45,15,468,386 }, + { 19,73,27,250,200,714,444,472,26,53,34,17,813,322,283,390,128,297,78,123,432,14,436,136,106,690,57,122,389,80,503,3 }, + { 3,17,21,45,62,32,38,12,155,14,2,328,5,99,401,536,828,13,227,488,106,51,719,119,540,76,165,221,115,629,209,41 }, + { 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1,23,13,15,51,0,21,2,515,5,141,180,120,165,700,202,197,4,753,12,33,9,7,82,115,93,3,352,260,6,110,48 }, + { 15,515,700,753,0,1,2,5,3,4,8,13,180,341,10,23,7,6,9,51,77,197,961,115,165,82,120,31,22,202,457,217 }, + { 559,661,922,564,141,533,10,317,373,110,143,269,244,260,332,261,93,642,752,295,351,876,531,843,180,206,728,384,352,1,434,120 }, + { 15,515,1,0,700,2,13,23,753,5,51,180,3,165,12,6,197,115,4,9,7,21,719,8,457,82,141,120,33,22,901,10 }, + { 198,234,0,325,5,77,202,416,20,147,32,43,639,315,49,61,450,455,142,21,113,230,22,318,725,342,207,13,95,904,494,10 }, + { 447,264,363,9,411,676,682,1,156,664,821,478,166,354,812,39,100,905,382,897,98,18,759,404,31,101,724,5,265,223,88,13 }, + { 24,14,69,16,35,18,2,7,108,189,71,67,267,149,1,46,68,83,38,140,0,236,251,9,388,60,133,103,65,28,29,50 }, + { 16,7,35,20,14,18,109,2,43,120,107,60,1,121,326,907,553,77,13,147,23,82,68,260,0,403,5,24,202,126,265,199 }, + { 30,131,187,276,31,44,613,442,39,9,190,228,1,839,116,935,908,219,127,88,244,224,110,137,93,201,98,141,36,567,0,856 }, + { 98,223,1,393,812,265,100,421,593,834,697,48,51,410,791,382,21,88,31,284,9,125,96,293,230,23,213,217,656,689,541,5 }, + { 98,51,127,219,616,258,105,293,395,421,924,512,31,308,23,201,116,44,301,272,763,276,125,13,453,170,401,295,261,944,115,567 }, + { 253,110,951,352,811,206,332,180,141,244,282,10,854,417,642,638,559,752,143,911,260,55,93,533,499,498,661,120,351,959,564,341 }, + { 49,9,159,254,272,158,0,131,28,39,627,105,327,286,22,518,688,578,68,347,374,101,224,424,95,35,219,24,16,364,65,344 }, + { 105,22,131,272,98,286,327,109,374,239,28,95,320,219,9,224,55,127,187,36,578,169,64,185,538,1,159,10,371,634,49,616 }, + { 691,478,340,1,658,914,724,363,744,698,156,772,411,296,682,447,9,284,335,98,264,303,909,21,354,410,225,13,664,686,88,919 }, + { 16,24,35,18,71,7,140,108,189,267,92,60,14,230,68,69,9,1,149,46,246,191,388,167,2,0,118,236,133,21,674,5 }, + { 9,0,127,31,98,371,395,39,737,49,1,44,385,272,512,28,293,242,836,761,254,299,101,16,187,22,116,158,159,131,18,21 }, + { 16,18,68,0,60,35,9,101,252,28,118,24,419,55,7,109,604,71,39,121,22,364,14,158,191,167,925,126,329,21,92,49 }, + { 116,268,203,93,206,692,551,31,417,940,499,8,473,44,202,523,959,0,120,137,559,22,450,403,576,10,728,299,13,326,51,1 }, + { 225,459,744,1,919,914,691,330,622,21,141,223,5,284,934,335,88,538,340,82,385,839,363,120,478,98,48,30,64,32,686,166 }, + { 5,1,2,0,14,36,21,281,12,48,50,67,22,28,54,83,24,218,38,10,181,9,32,18,65,58,45,114,430,17,99,37 }, + { 137,450,202,704,120,260,326,318,968,269,851,403,291,77,23,141,182,310,494,373,351,457,82,890,349,110,60,128,817,678,105,96 }, + { 15,515,700,753,4,33,13,23,77,5,40,11,102,93,1,21,110,51,82,117,141,2,10,8,32,64,120,31,202,3,217,115 }, + { 15,13,1,23,515,0,51,2,700,5,753,21,180,141,165,3,12,115,197,4,7,6,457,9,352,202,33,8,719,120,77,341 }, + { 219,127,258,98,276,201,131,395,944,293,116,284,567,31,242,105,137,935,295,44,403,860,51,224,576,456,9,371,578,475,202,512 }, + { 16,7,18,35,60,0,14,20,118,28,68,22,2,24,1,92,158,107,5,49,154,126,109,12,43,10,55,6,677,71,21,168 }, + { 93,728,531,160,559,373,574,120,295,860,533,269,717,260,926,902,258,318,36,201,261,434,851,137,617,141,187,352,843,384,332,251 }, + { 28,0,1,9,22,109,83,39,49,12,36,67,55,5,96,2,128,30,158,69,21,23,160,208,35,13,65,323,50,141,194,238 }, + { 23,13,51,1,5,15,141,21,0,2,165,515,202,700,12,197,180,120,32,115,4,753,64,9,7,269,6,3,125,386,48,453 }, + { 5,21,13,49,14,20,7,23,43,32,1,0,652,48,713,22,38,2,16,132,955,107,12,279,24,888,197,640,70,303,18,638 }, + { 9,0,28,39,1,30,35,101,22,67,83,141,49,175,36,68,55,88,13,251,10,69,23,158,180,115,64,100,217,65,345,166 }, + { 260,120,82,269,5,450,351,1,202,141,854,13,77,922,32,33,137,4,23,125,291,21,15,515,165,349,177,700,318,326,180,753 }, + { 121,16,18,35,363,101,60,20,107,14,68,259,621,55,604,43,7,252,9,364,126,0,167,191,5,407,132,28,199,419,146,10 }, + { 13,23,51,1,15,0,2,141,5,515,12,21,700,115,165,180,4,753,3,197,202,32,9,120,7,8,6,11,37,10,457,269 }, + { 201,144,206,443,418,203,435,96,335,459,187,1,88,332,330,321,269,934,30,372,822,521,268,326,44,523,382,141,410,264,494,473 }, + { 31,44,276,201,116,131,284,662,567,144,9,489,98,295,268,434,0,30,137,39,93,1,187,22,219,918,110,299,141,36,224,384 }, + { 520,478,664,1,264,604,9,167,777,759,411,0,806,724,48,21,101,68,647,936,363,223,118,682,410,18,100,16,252,98,265,13 }, + { 23,70,21,87,60,75,120,182,163,379,92,18,7,937,71,121,446,132,24,98,931,126,107,77,795,195,115,44,411,146,51,850 }, + { 39,9,0,737,127,31,846,98,1,827,105,310,371,30,254,100,44,18,395,242,272,101,385,916,836,16,265,131,938,93,166,557 }, + { 279,20,43,126,107,7,92,16,356,362,60,595,246,359,598,35,0,683,939,653,121,97,125,441,399,392,150,199,48,230,14,649 }, + { 206,417,93,959,499,728,8,559,120,473,137,141,10,564,31,260,44,450,203,341,253,244,373,116,143,638,268,180,352,110,318,940 }, + { 259,465,147,132,590,687,534,199,581,146,941,427,107,640,279,178,121,5,195,150,522,955,198,35,786,929,798,142,1,21,325,626 }, + { 523,15,120,450,202,515,403,51,817,700,13,753,23,457,33,899,128,64,730,102,494,342,115,719,453,196,49,99,318,421,308,5 }, + { 141,559,10,244,365,564,661,180,253,143,752,110,55,317,533,341,901,93,373,206,535,160,82,922,260,36,531,964,352,332,261,197 }, + { 219,258,98,127,276,964,943,137,843,535,201,935,131,860,261,295,284,567,206,44,116,31,253,492,203,332,160,615,36,93,55,692 }, + { 0,319,422,207,945,693,577,887,32,804,95,344,104,904,61,20,5,43,7,725,113,510,306,102,49,263,153,426,33,83,22,9 }, + { 1,22,0,5,12,2,36,21,28,86,49,105,9,10,23,13,141,95,31,55,128,37,51,4,83,202,3,64,96,7,32,44 }, + { 15,515,13,700,1,0,753,2,23,3,4,5,51,10,115,197,6,33,12,9,165,7,8,77,11,961,180,269,141,22,120,457 }, + { 15,1,23,120,77,13,515,51,141,202,700,180,110,137,260,753,326,5,128,102,0,21,2,165,269,33,197,450,318,217,93,115 }, + { 15,515,1,700,0,753,13,2,23,180,51,5,120,4,9,115,197,12,7,165,21,33,6,82,3,8,523,901,31,141,457,260 }, + { 16,18,24,7,92,35,60,75,9,13,71,14,0,108,50,21,126,121,1,140,23,5,132,146,2,12,128,10,64,141,70,87 }, + { 180,341,901,15,515,1,365,700,0,2,197,753,115,4,10,13,752,5,3,8,165,317,141,23,143,873,44,31,569,55,93,6 }, + { 9,0,175,35,101,28,39,67,68,1,65,83,30,69,364,336,22,114,55,124,194,158,100,289,252,166,64,345,103,36,50,88 }, + { 64,165,180,197,115,247,217,237,21,13,32,316,22,141,352,72,288,304,95,225,76,391,386,16,468,90,49,35,365,640,372,23 }, + { 15,515,700,13,753,1,0,2,23,4,5,3,115,51,141,197,12,10,180,961,7,9,21,33,217,6,8,165,457,11,77,341 }, + { 132,121,199,146,60,279,493,640,407,598,126,195,534,581,955,590,107,5,150,35,522,49,259,16,18,360,156,0,147,362,21,167 }, + { 0,1,28,9,22,5,36,12,65,24,67,96,2,83,18,50,114,55,21,16,7,10,23,14,13,160,137,51,48,218,103,69 }, + { 93,120,957,77,30,968,459,110,137,160,613,102,202,352,373,141,31,372,217,330,190,318,269,260,203,44,28,473,228,177,863,704 }, + { 15,515,700,0,753,1,13,23,2,51,5,9,120,82,4,7,901,197,10,8,260,180,341,12,33,6,3,523,165,102,115,141 }, + { 206,417,8,141,499,44,244,93,31,10,137,253,559,116,728,144,120,564,269,638,203,352,143,260,341,752,268,717,951,180,160,110 }, + { 530,254,228,1,96,21,406,39,827,31,669,840,613,829,137,679,166,98,23,51,960,438,131,93,48,224,219,317,310,36,876,190 }, + { 15,515,700,753,13,457,0,197,719,1,165,82,23,8,120,730,2,10,12,180,134,5,9,141,260,4,351,51,115,3,341,899 }, + { 0,16,68,9,24,28,18,35,252,109,39,419,124,158,154,55,101,71,22,118,60,7,49,65,333,14,1,10,329,364,677,346 }, + { 1,15,13,23,515,51,120,0,700,180,2,165,5,753,141,197,21,33,202,102,260,4,9,12,7,326,137,450,115,6,82,110 }, + { 535,253,352,564,110,365,82,180,341,10,854,533,55,898,244,901,873,141,752,143,642,559,498,317,36,951,115,964,638,282,661,197 }, + { 31,44,125,338,116,64,242,36,1,10,55,22,456,237,180,13,299,164,506,86,23,165,558,143,0,762,492,479,844,546,93,8 }, + { 13,23,4,1,202,2,0,51,115,77,141,180,5,15,217,3,33,11,515,317,9,10,102,21,700,341,365,318,269,64,32,128 }, + { 9,39,0,166,68,101,28,364,30,158,562,35,175,65,333,154,49,404,706,124,21,252,274,168,190,289,100,570,16,1,310,346 }, + { 15,515,700,753,341,13,0,23,1,33,141,4,260,82,77,51,351,180,9,5,115,137,10,217,11,120,102,40,349,269,202,854 } + }; + + static inline uint32_t iabs(int32_t i) { return (i < 0) ? static_cast(-i) : static_cast(i); } + + static inline uint8_t to_5(uint32_t v) { v = v * 31 + 128; return (uint8_t)((v + (v >> 8)) >> 8); } + static inline uint8_t to_6(uint32_t v) { v = v * 63 + 128; return (uint8_t)((v + (v >> 8)) >> 8); } + + template inline S maximum(S a, S b) { return (a > b) ? a : b; } + template inline S maximum(S a, S b, S c) { return maximum(maximum(a, b), c); } + template inline S maximum(S a, S b, S c, S d) { return maximum(maximum(maximum(a, b), c), d); } + + template inline S minimum(S a, S b) { return (a < b) ? a : b; } + template inline S minimum(S a, S b, S c) { return minimum(minimum(a, b), c); } + template inline S minimum(S a, S b, S c, S d) { return minimum(minimum(minimum(a, b), c), d); } + + template inline T square(T a) { return a * a; } + + static inline float clampf(float value, float low, float high) { if (value < low) value = low; else if (value > high) value = high; return value; } + static inline uint8_t clamp255(int32_t i) { return (uint8_t)((i & 0xFFFFFF00U) ? (~(i >> 31)) : i); } + + template inline S clamp(S value, S low, S high) { return (value < low) ? low : ((value > high) ? high : value); } + static inline int32_t clampi(int32_t value, int32_t low, int32_t high) { if (value < low) value = low; else if (value > high) value = high; return value; } + + static inline int squarei(int a) { return a * a; } + static inline int absi(int a) { return (a < 0) ? -a : a; } + + enum eNoClamp { cNoClamp }; + + struct color32 + { + union + { + struct + { + uint8_t r; + uint8_t g; + uint8_t b; + uint8_t a; + }; + + uint8_t c[4]; + + uint32_t m; + }; + + color32() { } + + color32(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { set(vr, vg, vb, va); } + color32(eNoClamp unused, uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { (void)unused; set_noclamp_rgba(vr, vg, vb, va); } + + void set(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { c[0] = static_cast(vr); c[1] = static_cast(vg); c[2] = static_cast(vb); c[3] = static_cast(va); } + + void set_noclamp_rgb(uint32_t vr, uint32_t vg, uint32_t vb) { c[0] = static_cast(vr); c[1] = static_cast(vg); c[2] = static_cast(vb); } + void set_noclamp_rgba(uint32_t vr, uint32_t vg, uint32_t vb, uint32_t va) { set(vr, vg, vb, va); } + + void set_clamped(int vr, int vg, int vb, int va) { c[0] = clamp255(vr); c[1] = clamp255(vg); c[2] = clamp255(vb); c[3] = clamp255(va); } + + uint8_t operator[] (uint32_t idx) const { assert(idx < 4); return c[idx]; } + uint8_t &operator[] (uint32_t idx) { assert(idx < 4); return c[idx]; } + + bool operator== (const color32&rhs) const { return m == rhs.m; } + + void set_rgb(const color32& other) { c[0] = static_cast(other.c[0]); c[1] = static_cast(other.c[1]); c[2] = static_cast(other.c[2]); } + + static color32 comp_min(const color32& a, const color32& b) { return color32(cNoClamp, std::min(a[0], b[0]), std::min(a[1], b[1]), std::min(a[2], b[2]), std::min(a[3], b[3])); } + static color32 comp_max(const color32& a, const color32& b) { return color32(cNoClamp, std::max(a[0], b[0]), std::max(a[1], b[1]), std::max(a[2], b[2]), std::max(a[3], b[3])); } + }; + + enum dxt_constants + { + cDXT1SelectorBits = 2U, cDXT1SelectorValues = 1U << cDXT1SelectorBits, cDXT1SelectorMask = cDXT1SelectorValues - 1U, + cDXT5SelectorBits = 3U, cDXT5SelectorValues = 1U << cDXT5SelectorBits, cDXT5SelectorMask = cDXT5SelectorValues - 1U, + }; + + struct bc1_block + { + enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 }; + + uint8_t m_low_color[cTotalEndpointBytes]; + uint8_t m_high_color[cTotalEndpointBytes]; + uint8_t m_selectors[cTotalSelectorBytes]; + + inline uint32_t get_high_color() const { return m_high_color[0] | (m_high_color[1] << 8U); } + inline uint32_t get_low_color() const { return m_low_color[0] | (m_low_color[1] << 8U); } + inline void set_low_color(uint16_t c) { m_low_color[0] = static_cast(c & 0xFF); m_low_color[1] = static_cast((c >> 8) & 0xFF); } + inline void set_high_color(uint16_t c) { m_high_color[0] = static_cast(c & 0xFF); m_high_color[1] = static_cast((c >> 8) & 0xFF); } + inline uint32_t get_selector(uint32_t x, uint32_t y) const { assert((x < 4U) && (y < 4U)); return (m_selectors[y] >> (x * cDXT1SelectorBits)) & cDXT1SelectorMask; } + inline void set_selector(uint32_t x, uint32_t y, uint32_t val) { assert((x < 4U) && (y < 4U) && (val < 4U)); m_selectors[y] &= (~(cDXT1SelectorMask << (x * cDXT1SelectorBits))); m_selectors[y] |= (val << (x * cDXT1SelectorBits)); } + + static uint16_t pack_color(const color32& color, bool scaled, uint32_t bias = 127U) + { + uint32_t r = color.r, g = color.g, b = color.b; + if (scaled) + { + r = (r * 31U + bias) / 255U; + g = (g * 63U + bias) / 255U; + b = (b * 31U + bias) / 255U; + } + return static_cast(minimum(b, 31U) | (minimum(g, 63U) << 5U) | (minimum(r, 31U) << 11U)); + } + + static uint16_t pack_unscaled_color(uint32_t r, uint32_t g, uint32_t b) { return static_cast(b | (g << 5U) | (r << 11U)); } + + static void unpack_color(uint32_t c, uint32_t& r, uint32_t& g, uint32_t& b) + { + r = (c >> 11) & 31; + g = (c >> 5) & 63; + b = c & 31; + + r = (r << 3) | (r >> 2); + g = (g << 2) | (g >> 4); + b = (b << 3) | (b >> 2); + } + }; + + static uint16_t g_total_ordering_hash[4096]; + static float g_selector_factors[NUM_UNIQUE_TOTAL_ORDERINGS][3]; + + const uint32_t TOTAL_ORDER_0_16 = 15; + const uint32_t TOTAL_ORDER_1_16 = 700; + const uint32_t TOTAL_ORDER_2_16 = 753; + const uint32_t TOTAL_ORDER_3_16 = 515; + + struct hist + { + uint8_t m_hist[4]; + + hist() + { + memset(m_hist, 0, sizeof(m_hist)); + } + + hist(uint32_t i, uint32_t j, uint32_t k, uint32_t l) + { + m_hist[0] = (uint8_t)i; + m_hist[1] = (uint8_t)j; + m_hist[2] = (uint8_t)k; + m_hist[3] = (uint8_t)l; + } + + inline bool operator== (const hist &h) const + { + if (m_hist[0] != h.m_hist[0]) return false; + if (m_hist[1] != h.m_hist[1]) return false; + if (m_hist[2] != h.m_hist[2]) return false; + if (m_hist[3] != h.m_hist[3]) return false; + return true; + } + + inline bool any_16() const + { + return (m_hist[0] == 16) || (m_hist[1] == 16) || (m_hist[2] == 16) || (m_hist[3] == 16); + } + + inline uint32_t lookup_total_ordering_index() const + { + if (m_hist[0] == 16) + return TOTAL_ORDER_0_16; + else if (m_hist[1] == 16) + return TOTAL_ORDER_1_16; + else if (m_hist[2] == 16) + return TOTAL_ORDER_2_16; + else if (m_hist[3] == 16) + return TOTAL_ORDER_3_16; + + // Must sum to 16, so m_hist[3] isn't needed. + return g_total_ordering_hash[m_hist[0] | (m_hist[1] << 4) | (m_hist[2] << 8)]; + } + }; + + struct bc1_match_entry + { + uint8_t m_hi; + uint8_t m_lo; + }; + + static bc1_match_entry g_bc1_match5_equals_1[256], g_bc1_match6_equals_1[256]; // selector 1, allow equals hi/lo + + static void prepare_bc1_single_color_table(bc1_match_entry* pTable, const uint8_t* pExpand, int size0, int size1, int sel) + { + for (int i = 0; i < 256; i++) + { + int lowest_e = 256; + for (int lo = 0; lo < size0; lo++) + { + for (int hi = 0; hi < size1; hi++) + { + const int lo_e = pExpand[lo], hi_e = pExpand[hi]; + int e; + + if (sel == 1) + { + // Selector 1 + e = iabs(((hi_e * 2 + lo_e) / 3) - i); + e += (iabs(hi_e - lo_e) * 3) / 100; + } + else + { + assert(sel == 0); + + // Selector 0 + e = iabs(hi_e - i); + } + + if (e < lowest_e) + { + pTable[i].m_hi = static_cast(hi); + pTable[i].m_lo = static_cast(lo); + + lowest_e = e; + } + + } // hi + } // lo + } + } + + // This table is: 9 * (w * w), 9 * ((1.0f - w) * w), 9 * ((1.0f - w) * (1.0f - w)) + // where w is [0,1/3,2/3,1]. 9 is the perfect multiplier. + static const uint32_t s_weight_vals[4] = { 0x000009, 0x010204, 0x040201, 0x090000 }; + + static inline void compute_selector_factors(const hist &h, float &iz00, float &iz10, float &iz11) + { + uint32_t weight_accum = 0; + for (uint32_t sel = 0; sel < 4; sel++) + weight_accum += s_weight_vals[sel] * h.m_hist[sel]; + + float z00 = (float)((weight_accum >> 16) & 0xFF); + float z10 = (float)((weight_accum >> 8) & 0xFF); + float z11 = (float)(weight_accum & 0xFF); + float z01 = z10; + + float det = z00 * z11 - z01 * z10; + if (fabs(det) < 1e-8f) + det = 0.0f; + else + det = (3.0f / 255.0f) / det; + + iz00 = z11 * det; + iz10 = -z10 * det; + iz11 = z00 * det; + } + + static bool g_initialized; + + void encode_bc1_init() + { + if (g_initialized) + return; + + uint8_t bc1_expand5[32]; + for (int i = 0; i < 32; i++) + bc1_expand5[i] = static_cast((i << 3) | (i >> 2)); + prepare_bc1_single_color_table(g_bc1_match5_equals_1, bc1_expand5, 32, 32, 1); + + uint8_t bc1_expand6[64]; + for (int i = 0; i < 64; i++) + bc1_expand6[i] = static_cast((i << 2) | (i >> 4)); + prepare_bc1_single_color_table(g_bc1_match6_equals_1, bc1_expand6, 64, 64, 1); + + for (uint32_t i = 0; i < NUM_UNIQUE_TOTAL_ORDERINGS; i++) + { + hist h; + h.m_hist[0] = (uint8_t)g_unique_total_orders[i][0]; + h.m_hist[1] = (uint8_t)g_unique_total_orders[i][1]; + h.m_hist[2] = (uint8_t)g_unique_total_orders[i][2]; + h.m_hist[3] = (uint8_t)g_unique_total_orders[i][3]; + + if (!h.any_16()) + g_total_ordering_hash[h.m_hist[0] | (h.m_hist[1] << 4) | (h.m_hist[2] << 8)] = (uint16_t)i; + + compute_selector_factors(h, g_selector_factors[i][0], g_selector_factors[i][1], g_selector_factors[i][2]); + } + + g_initialized = true; + } + + void encode_bc1_solid_block(void* pDst, uint32_t fr, uint32_t fg, uint32_t fb) + { + bc1_block* pDst_block = static_cast(pDst); + + uint32_t mask = 0xAA; + uint32_t max16 = (g_bc1_match5_equals_1[fr].m_hi << 11) | (g_bc1_match6_equals_1[fg].m_hi << 5) | g_bc1_match5_equals_1[fb].m_hi; + uint32_t min16 = (g_bc1_match5_equals_1[fr].m_lo << 11) | (g_bc1_match6_equals_1[fg].m_lo << 5) | g_bc1_match5_equals_1[fb].m_lo; + + if (min16 == max16) + { + // Always forbid 3 color blocks + // This is to guarantee that BC3 blocks never use punchthrough alpha (3 color) mode, which isn't supported on some (all?) GPU's. + mask = 0; + + // Make l > h + if (min16 > 0) + min16--; + else + { + // l = h = 0 + assert(min16 == max16 && max16 == 0); + + max16 = 1; + min16 = 0; + mask = 0x55; + } + + assert(max16 > min16); + } + + if (max16 < min16) + { + std::swap(max16, min16); + mask ^= 0x55; + } + + pDst_block->set_low_color(static_cast(max16)); + pDst_block->set_high_color(static_cast(min16)); + pDst_block->m_selectors[0] = static_cast(mask); + pDst_block->m_selectors[1] = static_cast(mask); + pDst_block->m_selectors[2] = static_cast(mask); + pDst_block->m_selectors[3] = static_cast(mask); + } + + static const float g_midpoint5[32] = { .015686f, .047059f, .078431f, .111765f, .145098f, .176471f, .207843f, .241176f, .274510f, .305882f, .337255f, .370588f, .403922f, .435294f, .466667f, .5f, .533333f, .564706f, .596078f, .629412f, .662745f, .694118f, .725490f, .758824f, .792157f, .823529f, .854902f, .888235f, .921569f, .952941f, .984314f, 1e+37f }; + static const float g_midpoint6[64] = { .007843f, .023529f, .039216f, .054902f, .070588f, .086275f, .101961f, .117647f, .133333f, .149020f, .164706f, .180392f, .196078f, .211765f, .227451f, .245098f, .262745f, .278431f, .294118f, .309804f, .325490f, .341176f, .356863f, .372549f, .388235f, .403922f, .419608f, .435294f, .450980f, .466667f, .482353f, .500000f, .517647f, .533333f, .549020f, .564706f, .580392f, .596078f, .611765f, .627451f, .643137f, .658824f, .674510f, .690196f, .705882f, .721569f, .737255f, .754902f, .772549f, .788235f, .803922f, .819608f, .835294f, .850980f, .866667f, .882353f, .898039f, .913725f, .929412f, .945098f, .960784f, .976471f, .992157f, 1e+37f }; + + struct vec3F { float c[3]; }; + + static inline void compute_least_squares_endpoints_rgb( + vec3F* pXl, vec3F* pXh, + int total_r, int total_g, int total_b, + float iz00, float iz10, float iz11, + uint32_t s, const uint32_t r_sum[17], const uint32_t g_sum[17], const uint32_t b_sum[17]) + { + const float iz01 = iz10; + + const uint32_t f1 = g_unique_total_orders[s][0]; + const uint32_t f2 = g_unique_total_orders[s][0] + g_unique_total_orders[s][1]; + const uint32_t f3 = g_unique_total_orders[s][0] + g_unique_total_orders[s][1] + g_unique_total_orders[s][2]; + uint32_t uq00_r = (r_sum[f2] - r_sum[f1]) + (r_sum[f3] - r_sum[f2]) * 2 + (r_sum[16] - r_sum[f3]) * 3; + uint32_t uq00_g = (g_sum[f2] - g_sum[f1]) + (g_sum[f3] - g_sum[f2]) * 2 + (g_sum[16] - g_sum[f3]) * 3; + uint32_t uq00_b = (b_sum[f2] - b_sum[f1]) + (b_sum[f3] - b_sum[f2]) * 2 + (b_sum[16] - b_sum[f3]) * 3; + + float q10_r = (float)(total_r * 3 - uq00_r); + float q10_g = (float)(total_g * 3 - uq00_g); + float q10_b = (float)(total_b * 3 - uq00_b); + + pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r; + pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r; + + pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g; + pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g; + + pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b; + pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b; + } + + static inline bool compute_least_squares_endpoints_rgb(const color32* pColors, const uint8_t* pSelectors, vec3F* pXl, vec3F* pXh, int total_r, int total_g, int total_b) + { + uint32_t uq00_r = 0, uq00_g = 0, uq00_b = 0; + uint32_t weight_accum = 0; + for (uint32_t i = 0; i < 16; i++) + { + const uint8_t r = pColors[i].c[0], g = pColors[i].c[1], b = pColors[i].c[2]; + const uint8_t sel = pSelectors[i]; + + weight_accum += s_weight_vals[sel]; + uq00_r += sel * r; + uq00_g += sel * g; + uq00_b += sel * b; + } + + int q10_r = total_r * 3 - uq00_r; + int q10_g = total_g * 3 - uq00_g; + int q10_b = total_b * 3 - uq00_b; + + float z00 = (float)((weight_accum >> 16) & 0xFF); + float z10 = (float)((weight_accum >> 8) & 0xFF); + float z11 = (float)(weight_accum & 0xFF); + float z01 = z10; + + float det = z00 * z11 - z01 * z10; + if (fabs(det) < 1e-8f) + return false; + + det = (3.0f / 255.0f) / det; + + float iz00, iz01, iz10, iz11; + iz00 = z11 * det; + iz01 = -z01 * det; + iz10 = -z10 * det; + iz11 = z00 * det; + + pXl->c[0] = iz00 * (float)uq00_r + iz01 * q10_r; + pXh->c[0] = iz10 * (float)uq00_r + iz11 * q10_r; + + pXl->c[1] = iz00 * (float)uq00_g + iz01 * q10_g; + pXh->c[1] = iz10 * (float)uq00_g + iz11 * q10_g; + + pXl->c[2] = iz00 * (float)uq00_b + iz01 * q10_b; + pXh->c[2] = iz10 * (float)uq00_b + iz11 * q10_b; + + return true; + } + + static inline void bc1_find_sels(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16]) + { + uint32_t block_r[4], block_g[4], block_b[4]; + + block_r[0] = (lr << 3) | (lr >> 2); block_g[0] = (lg << 2) | (lg >> 4); block_b[0] = (lb << 3) | (lb >> 2); + block_r[3] = (hr << 3) | (hr >> 2); block_g[3] = (hg << 2) | (hg >> 4); block_b[3] = (hb << 3) | (hb >> 2); + block_r[1] = (block_r[0] * 2 + block_r[3]) / 3; block_g[1] = (block_g[0] * 2 + block_g[3]) / 3; block_b[1] = (block_b[0] * 2 + block_b[3]) / 3; + block_r[2] = (block_r[3] * 2 + block_r[0]) / 3; block_g[2] = (block_g[3] * 2 + block_g[0]) / 3; block_b[2] = (block_b[3] * 2 + block_b[0]) / 3; + + int ar = block_r[3] - block_r[0], ag = block_g[3] - block_g[0], ab = block_b[3] - block_b[0]; + + int dots[4]; + for (uint32_t i = 0; i < 4; i++) + dots[i] = (int)block_r[i] * ar + (int)block_g[i] * ag + (int)block_b[i] * ab; + + int t0 = dots[0] + dots[1], t1 = dots[1] + dots[2], t2 = dots[2] + dots[3]; + + ar *= 2; ag *= 2; ab *= 2; + + static const uint8_t s_sels[4] = { 3, 2, 1, 0 }; + + for (uint32_t i = 0; i < 16; i += 4) + { + const int d0 = pSrc_pixels[i+0].r * ar + pSrc_pixels[i+0].g * ag + pSrc_pixels[i+0].b * ab; + const int d1 = pSrc_pixels[i+1].r * ar + pSrc_pixels[i+1].g * ag + pSrc_pixels[i+1].b * ab; + const int d2 = pSrc_pixels[i+2].r * ar + pSrc_pixels[i+2].g * ag + pSrc_pixels[i+2].b * ab; + const int d3 = pSrc_pixels[i+3].r * ar + pSrc_pixels[i+3].g * ag + pSrc_pixels[i+3].b * ab; + + sels[i+0] = s_sels[(d0 <= t0) + (d0 < t1) + (d0 < t2)]; + sels[i+1] = s_sels[(d1 <= t0) + (d1 < t1) + (d1 < t2)]; + sels[i+2] = s_sels[(d2 <= t0) + (d2 < t1) + (d2 < t2)]; + sels[i+3] = s_sels[(d3 <= t0) + (d3 < t1) + (d3 < t2)]; + } + } + + static inline uint32_t bc1_find_sels_err(const color32* pSrc_pixels, uint32_t lr, uint32_t lg, uint32_t lb, uint32_t hr, uint32_t hg, uint32_t hb, uint8_t sels[16], uint32_t cur_err = UINT32_MAX) + { + uint32_t block_r[4], block_g[4], block_b[4]; + + block_r[0] = (lr << 3) | (lr >> 2); block_g[0] = (lg << 2) | (lg >> 4); block_b[0] = (lb << 3) | (lb >> 2); + block_r[3] = (hr << 3) | (hr >> 2); block_g[3] = (hg << 2) | (hg >> 4); block_b[3] = (hb << 3) | (hb >> 2); + block_r[1] = (block_r[0] * 2 + block_r[3]) / 3; block_g[1] = (block_g[0] * 2 + block_g[3]) / 3; block_b[1] = (block_b[0] * 2 + block_b[3]) / 3; + block_r[2] = (block_r[3] * 2 + block_r[0]) / 3; block_g[2] = (block_g[3] * 2 + block_g[0]) / 3; block_b[2] = (block_b[3] * 2 + block_b[0]) / 3; + + int dr = block_r[3] - block_r[0], dg = block_g[3] - block_g[0], db = block_b[3] - block_b[0]; + + const float f = 4.0f / (float)(squarei(dr) + squarei(dg) + squarei(db) + .00000125f); + + uint32_t total_err = 0; + + for (uint32_t i = 0; i < 16; i++) + { + const int r = pSrc_pixels[i].r; + const int g = pSrc_pixels[i].g; + const int b = pSrc_pixels[i].b; + + int sel = (int)((float)((r - (int)block_r[0]) * dr + (g - (int)block_g[0]) * dg + (b - (int)block_b[0]) * db) * f + .5f); + sel = clampi(sel, 1, 3); + + uint32_t err0 = squarei((int)block_r[sel - 1] - (int)r) + squarei((int)block_g[sel - 1] - (int)g) + squarei((int)block_b[sel - 1] - (int)b); + uint32_t err1 = squarei((int)block_r[sel] - (int)r) + squarei((int)block_g[sel] - (int)g) + squarei((int)block_b[sel] - (int)b); + + int best_sel = sel; + uint32_t best_err = err1; + if (err0 == err1) + { + // Prefer non-interpolation + if ((best_sel - 1) == 0) + best_sel = 0; + } + else if (err0 < best_err) + { + best_sel = sel - 1; + best_err = err0; + } + + total_err += best_err; + + if (total_err >= cur_err) + break; + + sels[i] = (uint8_t)best_sel; + } + return total_err; + } + + static inline void precise_round_565(const vec3F &xl, const vec3F &xh, + int &trial_lr, int &trial_lg, int &trial_lb, + int &trial_hr, int &trial_hg, int &trial_hb) + { + trial_lr = (int)(xl.c[0] * 31.0f); + trial_lg = (int)(xl.c[1] * 63.0f); + trial_lb = (int)(xl.c[2] * 31.0f); + + trial_hr = (int)(xh.c[0] * 31.0f); + trial_hg = (int)(xh.c[1] * 63.0f); + trial_hb = (int)(xh.c[2] * 31.0f); + + if ((uint32_t)(trial_lr | trial_lb | trial_hr | trial_hb) > 31U) + { + trial_lr = ((uint32_t)trial_lr > 31U) ? (~trial_lr >> 31) & 31 : trial_lr; + trial_hr = ((uint32_t)trial_hr > 31U) ? (~trial_hr >> 31) & 31 : trial_hr; + + trial_lb = ((uint32_t)trial_lb > 31U) ? (~trial_lb >> 31) & 31 : trial_lb; + trial_hb = ((uint32_t)trial_hb > 31U) ? (~trial_hb >> 31) & 31 : trial_hb; + } + + if ((uint32_t)(trial_lg | trial_hg) > 63U) + { + trial_lg = ((uint32_t)trial_lg > 63U) ? (~trial_lg >> 31) & 63 : trial_lg; + trial_hg = ((uint32_t)trial_hg > 63U) ? (~trial_hg >> 31) & 63 : trial_hg; + } + + trial_lr = (trial_lr + (xl.c[0] > g_midpoint5[trial_lr])) & 31; + trial_lg = (trial_lg + (xl.c[1] > g_midpoint6[trial_lg])) & 63; + trial_lb = (trial_lb + (xl.c[2] > g_midpoint5[trial_lb])) & 31; + + trial_hr = (trial_hr + (xh.c[0] > g_midpoint5[trial_hr])) & 31; + trial_hg = (trial_hg + (xh.c[1] > g_midpoint6[trial_hg])) & 63; + trial_hb = (trial_hb + (xh.c[2] > g_midpoint5[trial_hb])) & 31; + } + + void encode_bc1(void* pDst, const uint8_t* pPixels, uint32_t flags, uint32_t total_orderings_to_try) + { + assert(g_initialized); + + const color32* pSrc_pixels = (const color32*)pPixels; + bc1_block* pDst_block = static_cast(pDst); + + int avg_r, avg_g, avg_b, min_r, min_g, min_b, max_r, max_g, max_b; + int lr = 0, lg = 0, lb = 0, hr = 0, hg = 0, hb = 0; + + uint8_t sels[16]; + + const uint32_t fr = pSrc_pixels[0].r, fg = pSrc_pixels[0].g, fb = pSrc_pixels[0].b; + + uint32_t j; + for (j = 1; j < 16; j++) + if ((pSrc_pixels[j].r != fr) || (pSrc_pixels[j].g != fg) || (pSrc_pixels[j].b != fb)) + break; + + if (j == 16) + { + encode_bc1_solid_block(pDst, fr, fg, fb); + return; + } + + // Select 2 colors along the principle axis. (There must be a faster/simpler way.) + int total_r = fr, total_g = fg, total_b = fb; + max_r = fr, max_g = fg, max_b = fb; + min_r = fr, min_g = fg, min_b = fb; + uint32_t grayscale_flag = (fr == fg) && (fr == fb); + for (uint32_t i = 1; i < 16; i++) + { + const int r = pSrc_pixels[i].r, g = pSrc_pixels[i].g, b = pSrc_pixels[i].b; + grayscale_flag &= ((r == g) && (r == b)); + max_r = std::max(max_r, r); max_g = std::max(max_g, g); max_b = std::max(max_b, b); + min_r = std::min(min_r, r); min_g = std::min(min_g, g); min_b = std::min(min_b, b); + total_r += r; total_g += g; total_b += b; + } + + avg_r = (total_r + 8) >> 4, avg_g = (total_g + 8) >> 4, avg_b = (total_b + 8) >> 4; + + if (grayscale_flag) + { + // Grayscale blocks are a common enough case to specialize. + if ((max_r - min_r) < 2) + { + lr = lb = hr = hb = to_5(fr); + lg = hg = to_6(fr); + } + else + { + lr = lb = to_5(min_r); + lg = to_6(min_r); + + hr = hb = to_5(max_r); + hg = to_6(max_r); + } + } + else + { + // Find the shortest vector from a AABB corner to the block's average color. + // This is to help avoid outliers. + uint32_t low_c = 0, high_c = 0; + + if (flags & cEncodeBC1UsePCA) + { + int icov[6] = { 0, 0, 0, 0, 0, 0 }; + for (uint32_t i = 0; i < 16; i++) + { + int r = (int)pSrc_pixels[i].r - avg_r; + int g = (int)pSrc_pixels[i].g - avg_g; + int b = (int)pSrc_pixels[i].b - avg_b; + icov[0] += r * r; + icov[1] += r * g; + icov[2] += r * b; + icov[3] += g * g; + icov[4] += g * b; + icov[5] += b * b; + } + + float cov[6]; + for (uint32_t i = 0; i < 6; i++) + cov[i] = static_cast(icov[i])* (1.0f / 255.0f); + + float xr = (float)(max_r - min_r); + float xg = (float)(max_g - min_g); + float xb = (float)(max_b - min_b); + for (uint32_t power_iter = 0; power_iter < 4; power_iter++) + { + float r = xr * cov[0] + xg * cov[1] + xb * cov[2]; + float g = xr * cov[1] + xg * cov[3] + xb * cov[4]; + float b = xr * cov[2] + xg * cov[4] + xb * cov[5]; + xr = r; xg = g; xb = b; + } + + float k = maximum(fabsf(xr), fabsf(xg), fabsf(xb)); + int saxis_r = 306, saxis_g = 601, saxis_b = 117; + if (k >= 2) + { + float m = 1024.0f / k; + saxis_r = (int)(xr * m); + saxis_g = (int)(xg * m); + saxis_b = (int)(xb * m); + } + + int low_dot = INT_MAX, high_dot = INT_MIN; + for (uint32_t i = 0; i < 16; i++) + { + int dot = pSrc_pixels[i].r * saxis_r + pSrc_pixels[i].g * saxis_g + pSrc_pixels[i].b * saxis_b; + if (dot < low_dot) + { + low_dot = dot; + low_c = i; + } + if (dot > high_dot) + { + high_dot = dot; + high_c = i; + } + } + } + else + { + uint32_t dist[3][2]; + dist[0][0] = square(min_r - avg_r) << 3; dist[0][1] = square(max_r - avg_r) << 3; + dist[1][0] = square(min_g - avg_g) << 3; dist[1][1] = square(max_g - avg_g) << 3; + dist[2][0] = square(min_b - avg_b) << 3; dist[2][1] = square(max_b - avg_b) << 3; + + uint32_t min_d0 = (dist[0][0] + dist[1][0] + dist[2][0]); + uint32_t d4 = (dist[0][0] + dist[1][0] + dist[2][1]) | 4; + min_d0 = std::min(min_d0, d4); + + uint32_t min_d1 = (dist[0][1] + dist[1][0] + dist[2][0]) | 1; + uint32_t d5 = (dist[0][1] + dist[1][0] + dist[2][1]) | 5; + min_d1 = std::min(min_d1, d5); + + uint32_t d2 = (dist[0][0] + dist[1][1] + dist[2][0]) | 2; + min_d0 = std::min(min_d0, d2); + + uint32_t d3 = (dist[0][1] + dist[1][1] + dist[2][0]) | 3; + min_d1 = std::min(min_d1, d3); + + uint32_t d6 = (dist[0][0] + dist[1][1] + dist[2][1]) | 6; + min_d0 = std::min(min_d0, d6); + + uint32_t d7 = (dist[0][1] + dist[1][1] + dist[2][1]) | 7; + min_d1 = std::min(min_d1, d7); + + uint32_t min_d = std::min(min_d0, min_d1); + uint32_t best_i = min_d & 7; + + int delta_r = (best_i & 1) ? (max_r - avg_r) : (avg_r - min_r); + int delta_g = (best_i & 2) ? (max_g - avg_g) : (avg_g - min_g); + int delta_b = (best_i & 4) ? (max_b - avg_b) : (avg_b - min_b); + + // Note: if delta_r/g/b==0, we actually want to choose a single color, so the block average color optimization kicks in. + if ((delta_r | delta_g | delta_b) != 0) + { + // Now we have a smaller AABB going from the block's average color to a cornerpoint of the larger AABB. + // Project all pixels colors along the 4 vectors going from a smaller AABB cornerpoint to the opposite cornerpoint, find largest projection. + // One of these vectors will be a decent approximation of the block's PCA. + const int saxis0_r = delta_r, saxis0_g = delta_g, saxis0_b = delta_b; + + int low_dot0 = INT_MAX, high_dot0 = INT_MIN; + int low_dot1 = INT_MAX, high_dot1 = INT_MIN; + int low_dot2 = INT_MAX, high_dot2 = INT_MIN; + int low_dot3 = INT_MAX, high_dot3 = INT_MIN; + + //int low_c0, low_c1, low_c2, low_c3; + //int high_c0, high_c1, high_c2, high_c3; + + for (uint32_t i = 0; i < 16; i++) + { + const int dotx = pSrc_pixels[i].r * saxis0_r; + const int doty = pSrc_pixels[i].g * saxis0_g; + const int dotz = pSrc_pixels[i].b * saxis0_b; + + const int dot0 = ((dotz + dotx + doty) << 4) + i; + const int dot1 = ((dotz - dotx - doty) << 4) + i; + const int dot2 = ((dotz - dotx + doty) << 4) + i; + const int dot3 = ((dotz + dotx - doty) << 4) + i; + + if (dot0 < low_dot0) + low_dot0 = dot0; + if ((dot0 ^ 15) > high_dot0) + high_dot0 = dot0 ^ 15; + + if (dot1 < low_dot1) + low_dot1 = dot1; + if ((dot1 ^ 15) > high_dot1) + high_dot1 = dot1 ^ 15; + + if (dot2 < low_dot2) + low_dot2 = dot2; + if ((dot2 ^ 15) > high_dot2) + high_dot2 = dot2 ^ 15; + + if (dot3 < low_dot3) + low_dot3 = dot3; + if ((dot3 ^ 15) > high_dot3) + high_dot3 = dot3 ^ 15; + } + + low_c = low_dot0 & 15, high_c = ~high_dot0 & 15; + uint32_t r = (high_dot0 & ~15) - (low_dot0 & ~15); + + uint32_t tr = (high_dot1 & ~15) - (low_dot1 & ~15); + if (tr > r) + low_c = low_dot1 & 15, high_c = ~high_dot1 & 15, r = tr; + + tr = (high_dot2 & ~15) - (low_dot2 & ~15); + if (tr > r) + low_c = low_dot2 & 15, high_c = ~high_dot2 & 15, r = tr; + + tr = (high_dot3 & ~15) - (low_dot3 & ~15); + if (tr > r) + low_c = low_dot3 & 15, high_c = ~high_dot3 & 15; + } + } + + lr = to_5(pSrc_pixels[low_c].r); + lg = to_6(pSrc_pixels[low_c].g); + lb = to_5(pSrc_pixels[low_c].b); + + hr = to_5(pSrc_pixels[high_c].r); + hg = to_6(pSrc_pixels[high_c].g); + hb = to_5(pSrc_pixels[high_c].b); + } + + uint32_t cur_err = 0; + + if (flags & cEncodeBC1UseLikelyTotalOrderings) + cur_err = bc1_find_sels_err(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels); + else + bc1_find_sels(pSrc_pixels, lr, lg, lb, hr, hg, hb, sels); + + const uint32_t total_ls_passes = flags & cEncodeBC1HighQuality ? 2 : 1; + for (uint32_t ls_pass = 0; ls_pass < total_ls_passes; ls_pass++) + { + int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb; + + vec3F xl, xh; + if (!compute_least_squares_endpoints_rgb(pSrc_pixels, sels, &xl, &xh, total_r, total_g, total_b)) + { + // All selectors equal - treat it as a solid block which should always be equal or better. + trial_lr = g_bc1_match5_equals_1[avg_r].m_hi; + trial_lg = g_bc1_match6_equals_1[avg_g].m_hi; + trial_lb = g_bc1_match5_equals_1[avg_b].m_hi; + + trial_hr = g_bc1_match5_equals_1[avg_r].m_lo; + trial_hg = g_bc1_match6_equals_1[avg_g].m_lo; + trial_hb = g_bc1_match5_equals_1[avg_b].m_lo; + + // In high/higher quality mode, let it try again in case the optimal tables have caused the sels to diverge. + } + else + { + precise_round_565(xl, xh, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb); + } + + if ((lr == trial_lr) && (lg == trial_lg) && (lb == trial_lb) && (hr == trial_hr) && (hg == trial_hg) && (hb == trial_hb)) + break; + + if (flags & cEncodeBC1UseLikelyTotalOrderings) + { + uint8_t trial_sels[16]; + uint32_t trial_err = bc1_find_sels_err(pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, cur_err); + if (trial_err < cur_err) + { + lr = trial_lr; + lg = trial_lg; + lb = trial_lb; + + hr = trial_hr; + hg = trial_hg; + hb = trial_hb; + + cur_err = trial_err; + memcpy(sels, trial_sels, 16); + } + else + break; + } + else + { + bc1_find_sels(pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, sels); + + lr = trial_lr; + lg = trial_lg; + lb = trial_lb; + + hr = trial_hr; + hg = trial_hg; + hb = trial_hb; + } + } + + if ((cur_err) && (flags & cEncodeBC1UseLikelyTotalOrderings)) + { + hist h; + for (uint32_t i = 0; i < 16; i++) + h.m_hist[sels[i]]++; + + const uint32_t orig_total_order_index = h.lookup_total_ordering_index(); + + int r0, g0, b0, r3, g3, b3; + r0 = (lr << 3) | (lr >> 2); g0 = (lg << 2) | (lg >> 4); b0 = (lb << 3) | (lb >> 2); + r3 = (hr << 3) | (hr >> 2); g3 = (hg << 2) | (hg >> 4); b3 = (hb << 3) | (hb >> 2); + + int ar = r3 - r0, ag = g3 - g0, ab = b3 - b0; + + int dots[16]; + for (uint32_t i = 0; i < 16; i++) + { + int r = pSrc_pixels[i].r; + int g = pSrc_pixels[i].g; + int b = pSrc_pixels[i].b; + int d = 0x1000000 + (r * ar + g * ag + b * ab); + assert(d >= 0); + dots[i] = (d << 4) + i; + } + + std::sort(dots, dots + 16); + + uint32_t r_sum[17], g_sum[17], b_sum[17]; + uint32_t r = 0, g = 0, b = 0; + for (uint32_t i = 0; i < 16; i++) + { + const uint32_t p = dots[i] & 15; + + r_sum[i] = r; + g_sum[i] = g; + b_sum[i] = b; + + r += pSrc_pixels[p].r; + g += pSrc_pixels[p].g; + b += pSrc_pixels[p].b; + } + + r_sum[16] = total_r; + g_sum[16] = total_g; + b_sum[16] = total_b; + +#if 0 + // Try them all, for debugging. + for (uint32_t s = 0; s < NUM_UNIQUE_TOTAL_ORDERINGS; s++) + { +#else + total_orderings_to_try = clampi(total_orderings_to_try, MIN_TOTAL_ORDERINGS, MAX_TOTAL_ORDERINGS); + for (uint32_t q = 0; q < total_orderings_to_try; q++) + { + const uint32_t s = g_best_total_orderings[orig_total_order_index][q]; +#endif + int trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb; + + vec3F xl, xh; + + if ((s == TOTAL_ORDER_0_16) || (s == TOTAL_ORDER_1_16) || (s == TOTAL_ORDER_2_16) || (s == TOTAL_ORDER_3_16)) + { + trial_lr = g_bc1_match5_equals_1[avg_r].m_hi; + trial_lg = g_bc1_match6_equals_1[avg_g].m_hi; + trial_lb = g_bc1_match5_equals_1[avg_b].m_hi; + + trial_hr = g_bc1_match5_equals_1[avg_r].m_lo; + trial_hg = g_bc1_match6_equals_1[avg_g].m_lo; + trial_hb = g_bc1_match5_equals_1[avg_b].m_lo; + } + else + { + compute_least_squares_endpoints_rgb(&xl, &xh, total_r, total_g, total_b, + g_selector_factors[s][0], g_selector_factors[s][1], g_selector_factors[s][2], s, r_sum, g_sum, b_sum); + + precise_round_565(xl, xh, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb); + } + + uint8_t trial_sels[16]; + uint32_t trial_err = bc1_find_sels_err(pSrc_pixels, trial_lr, trial_lg, trial_lb, trial_hr, trial_hg, trial_hb, trial_sels, cur_err); + if (trial_err < cur_err) + { + cur_err = trial_err; + + lr = trial_lr; + lg = trial_lg; + lb = trial_lb; + + hr = trial_hr; + hg = trial_hg; + hb = trial_hb; + + memcpy(sels, trial_sels, 16); + } + + } // s + + } + + uint32_t lc16 = bc1_block::pack_unscaled_color(lr, lg, lb); + uint32_t hc16 = bc1_block::pack_unscaled_color(hr, hg, hb); + + // Always forbid 3 color blocks + if (lc16 == hc16) + { + uint8_t mask = 0; + + // Make l > h + if (hc16 > 0) + hc16--; + else + { + // lc16 = hc16 = 0 + assert(lc16 == hc16 && hc16 == 0); + + hc16 = 0; + lc16 = 1; + mask = 0x55; // select hc16 + } + + assert(lc16 > hc16); + pDst_block->set_low_color(static_cast(lc16)); + pDst_block->set_high_color(static_cast(hc16)); + + pDst_block->m_selectors[0] = mask; + pDst_block->m_selectors[1] = mask; + pDst_block->m_selectors[2] = mask; + pDst_block->m_selectors[3] = mask; + } + else + { + uint8_t invert_mask = 0; + if (lc16 < hc16) + { + std::swap(lc16, hc16); + invert_mask = 0x55; + } + + assert(lc16 > hc16); + pDst_block->set_low_color((uint16_t)lc16); + pDst_block->set_high_color((uint16_t)hc16); + + uint32_t packed_sels = 0; + static const uint8_t s_sel_trans[4] = { 0, 2, 3, 1 }; + for (uint32_t i = 0; i < 16; i++) + packed_sels |= ((uint32_t)s_sel_trans[sels[i]] << (i * 2)); + + pDst_block->m_selectors[0] = (uint8_t)packed_sels ^ invert_mask; + pDst_block->m_selectors[1] = (uint8_t)(packed_sels >> 8) ^ invert_mask; + pDst_block->m_selectors[2] = (uint8_t)(packed_sels >> 16) ^ invert_mask; + pDst_block->m_selectors[3] = (uint8_t)(packed_sels >> 24) ^ invert_mask; + } + } + + // BC3-5 + + struct bc4_block + { + enum { cBC4SelectorBits = 3, cTotalSelectorBytes = 6, cMaxSelectorValues = 8 }; + uint8_t m_endpoints[2]; + + uint8_t m_selectors[cTotalSelectorBytes]; + + inline uint32_t get_low_alpha() const { return m_endpoints[0]; } + inline uint32_t get_high_alpha() const { return m_endpoints[1]; } + inline bool is_alpha6_block() const { return get_low_alpha() <= get_high_alpha(); } + + inline uint64_t get_selector_bits() const + { + return ((uint64_t)((uint32_t)m_selectors[0] | ((uint32_t)m_selectors[1] << 8U) | ((uint32_t)m_selectors[2] << 16U) | ((uint32_t)m_selectors[3] << 24U))) | + (((uint64_t)m_selectors[4]) << 32U) | + (((uint64_t)m_selectors[5]) << 40U); + } + + inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const + { + assert((x < 4U) && (y < 4U)); + return (selector_bits >> (((y * 4) + x) * cBC4SelectorBits))& (cMaxSelectorValues - 1); + } + + static inline uint32_t get_block_values6(uint8_t* pDst, uint32_t l, uint32_t h) + { + pDst[0] = static_cast(l); + pDst[1] = static_cast(h); + pDst[2] = static_cast((l * 4 + h) / 5); + pDst[3] = static_cast((l * 3 + h * 2) / 5); + pDst[4] = static_cast((l * 2 + h * 3) / 5); + pDst[5] = static_cast((l + h * 4) / 5); + pDst[6] = 0; + pDst[7] = 255; + return 6; + } + + static inline uint32_t get_block_values8(uint8_t* pDst, uint32_t l, uint32_t h) + { + pDst[0] = static_cast(l); + pDst[1] = static_cast(h); + pDst[2] = static_cast((l * 6 + h) / 7); + pDst[3] = static_cast((l * 5 + h * 2) / 7); + pDst[4] = static_cast((l * 4 + h * 3) / 7); + pDst[5] = static_cast((l * 3 + h * 4) / 7); + pDst[6] = static_cast((l * 2 + h * 5) / 7); + pDst[7] = static_cast((l + h * 6) / 7); + return 8; + } + + static inline uint32_t get_block_values(uint8_t* pDst, uint32_t l, uint32_t h) + { + if (l > h) + return get_block_values8(pDst, l, h); + else + return get_block_values6(pDst, l, h); + } + }; + + void encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride) + { + assert(g_initialized); + + uint32_t min0_v, max0_v, min1_v, max1_v, min2_v, max2_v, min3_v, max3_v; + + { + min0_v = max0_v = pPixels[0 * stride]; + min1_v = max1_v = pPixels[1 * stride]; + min2_v = max2_v = pPixels[2 * stride]; + min3_v = max3_v = pPixels[3 * stride]; + } + + { + uint32_t v0 = pPixels[4 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0); + uint32_t v1 = pPixels[5 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1); + uint32_t v2 = pPixels[6 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2); + uint32_t v3 = pPixels[7 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3); + } + + { + uint32_t v0 = pPixels[8 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0); + uint32_t v1 = pPixels[9 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1); + uint32_t v2 = pPixels[10 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2); + uint32_t v3 = pPixels[11 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3); + } + + { + uint32_t v0 = pPixels[12 * stride]; min0_v = std::min(min0_v, v0); max0_v = std::max(max0_v, v0); + uint32_t v1 = pPixels[13 * stride]; min1_v = std::min(min1_v, v1); max1_v = std::max(max1_v, v1); + uint32_t v2 = pPixels[14 * stride]; min2_v = std::min(min2_v, v2); max2_v = std::max(max2_v, v2); + uint32_t v3 = pPixels[15 * stride]; min3_v = std::min(min3_v, v3); max3_v = std::max(max3_v, v3); + } + + const uint32_t min_v = minimum(min0_v, min1_v, min2_v, min3_v); + const uint32_t max_v = maximum(max0_v, max1_v, max2_v, max3_v); + + uint8_t* pDst_bytes = static_cast(pDst); + pDst_bytes[0] = (uint8_t)max_v; + pDst_bytes[1] = (uint8_t)min_v; + + if (max_v == min_v) + { + memset(pDst_bytes + 2, 0, 6); + return; + } + + const uint32_t delta = max_v - min_v; + + // min_v is now 0. Compute thresholds between values by scaling max_v. It's x14 because we're adding two x7 scale factors. + const int t0 = delta * 13; + const int t1 = delta * 11; + const int t2 = delta * 9; + const int t3 = delta * 7; + const int t4 = delta * 5; + const int t5 = delta * 3; + const int t6 = delta * 1; + + // BC4 floors in its divisions, which we compensate for with the 4 bias. + // This function is optimal for all possible inputs (i.e. it outputs the same results as checking all 8 values and choosing the closest one). + const int bias = 4 - min_v * 14; + + static const uint32_t s_tran0[8] = { 1U , 7U , 6U , 5U , 4U , 3U , 2U , 0U }; + static const uint32_t s_tran1[8] = { 1U << 3U, 7U << 3U, 6U << 3U, 5U << 3U, 4U << 3U, 3U << 3U, 2U << 3U, 0U << 3U }; + static const uint32_t s_tran2[8] = { 1U << 6U, 7U << 6U, 6U << 6U, 5U << 6U, 4U << 6U, 3U << 6U, 2U << 6U, 0U << 6U }; + static const uint32_t s_tran3[8] = { 1U << 9U, 7U << 9U, 6U << 9U, 5U << 9U, 4U << 9U, 3U << 9U, 2U << 9U, 0U << 9U }; + + uint64_t a0, a1, a2, a3; + { + const int v0 = pPixels[0 * stride] * 14 + bias; + const int v1 = pPixels[1 * stride] * 14 + bias; + const int v2 = pPixels[2 * stride] * 14 + bias; + const int v3 = pPixels[3 * stride] * 14 + bias; + a0 = s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)]; + a1 = s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)]; + a2 = s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)]; + a3 = s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)]; + } + + { + const int v0 = pPixels[4 * stride] * 14 + bias; + const int v1 = pPixels[5 * stride] * 14 + bias; + const int v2 = pPixels[6 * stride] * 14 + bias; + const int v3 = pPixels[7 * stride] * 14 + bias; + a0 |= (s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)] << 12U); + a1 |= (s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)] << 12U); + a2 |= (s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)] << 12U); + a3 |= (s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)] << 12U); + } + + { + const int v0 = pPixels[8 * stride] * 14 + bias; + const int v1 = pPixels[9 * stride] * 14 + bias; + const int v2 = pPixels[10 * stride] * 14 + bias; + const int v3 = pPixels[11 * stride] * 14 + bias; + a0 |= (((uint64_t)s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)]) << 24U); + a1 |= (((uint64_t)s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)]) << 24U); + a2 |= (((uint64_t)s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)]) << 24U); + a3 |= (((uint64_t)s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)]) << 24U); + } + + { + const int v0 = pPixels[12 * stride] * 14 + bias; + const int v1 = pPixels[13 * stride] * 14 + bias; + const int v2 = pPixels[14 * stride] * 14 + bias; + const int v3 = pPixels[15 * stride] * 14 + bias; + a0 |= (((uint64_t)s_tran0[(v0 >= t0) + (v0 >= t1) + (v0 >= t2) + (v0 >= t3) + (v0 >= t4) + (v0 >= t5) + (v0 >= t6)]) << 36U); + a1 |= (((uint64_t)s_tran1[(v1 >= t0) + (v1 >= t1) + (v1 >= t2) + (v1 >= t3) + (v1 >= t4) + (v1 >= t5) + (v1 >= t6)]) << 36U); + a2 |= (((uint64_t)s_tran2[(v2 >= t0) + (v2 >= t1) + (v2 >= t2) + (v2 >= t3) + (v2 >= t4) + (v2 >= t5) + (v2 >= t6)]) << 36U); + a3 |= (((uint64_t)s_tran3[(v3 >= t0) + (v3 >= t1) + (v3 >= t2) + (v3 >= t3) + (v3 >= t4) + (v3 >= t5) + (v3 >= t6)]) << 36U); + } + + const uint64_t f = a0 | a1 | a2 | a3; + + pDst_bytes[2] = (uint8_t)f; + pDst_bytes[3] = (uint8_t)(f >> 8U); + pDst_bytes[4] = (uint8_t)(f >> 16U); + pDst_bytes[5] = (uint8_t)(f >> 24U); + pDst_bytes[6] = (uint8_t)(f >> 32U); + pDst_bytes[7] = (uint8_t)(f >> 40U); + } + + void encode_bc3(void* pDst, const uint8_t* pPixels, uint32_t flags, uint32_t total_orderings_to_try) + { + assert(g_initialized); + + encode_bc4(pDst, pPixels + 3, 4); + encode_bc1(static_cast(pDst) + 8, pPixels, flags, total_orderings_to_try); + } + + void encode_bc5(void* pDst, const uint8_t* pPixels, uint32_t chan0, uint32_t chan1, uint32_t stride) + { + assert(g_initialized); + + encode_bc4(pDst, pPixels + chan0, stride); + encode_bc4(static_cast(pDst) + 8, pPixels + chan1, stride); + } + + // Returns true if the block uses 3 color punchthrough alpha mode. + bool unpack_bc1(const void* pBlock_bits, void* pPixels, bool set_alpha) + { + color32* pDst_pixels = static_cast(pPixels); + + static_assert(sizeof(bc1_block) == 8, "sizeof(bc1_block) == 8"); + static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8"); + + const bc1_block* pBlock = static_cast(pBlock_bits); + + const uint32_t l = pBlock->get_low_color(); + const uint32_t h = pBlock->get_high_color(); + + color32 c[4]; + + uint32_t r0, g0, b0, r1, g1, b1; + bc1_block::unpack_color(l, r0, g0, b0); + bc1_block::unpack_color(h, r1, g1, b1); + + bool used_punchthrough = false; + + if (l > h) + { + c[0].set_noclamp_rgba(r0, g0, b0, 255); + c[1].set_noclamp_rgba(r1, g1, b1, 255); + c[2].set_noclamp_rgba((r0 * 2 + r1) / 3, (g0 * 2 + g1) / 3, (b0 * 2 + b1) / 3, 255); + c[3].set_noclamp_rgba((r1 * 2 + r0) / 3, (g1 * 2 + g0) / 3, (b1 * 2 + b0) / 3, 255); + } + else + { + c[0].set_noclamp_rgba(r0, g0, b0, 255); + c[1].set_noclamp_rgba(r1, g1, b1, 255); + c[2].set_noclamp_rgba((r0 + r1) / 2, (g0 + g1) / 2, (b0 + b1) / 2, 255); + c[3].set_noclamp_rgba(0, 0, 0, 0); + used_punchthrough = true; + } + + if (set_alpha) + { + for (uint32_t y = 0; y < 4; y++, pDst_pixels += 4) + { + pDst_pixels[0] = c[pBlock->get_selector(0, y)]; + pDst_pixels[1] = c[pBlock->get_selector(1, y)]; + pDst_pixels[2] = c[pBlock->get_selector(2, y)]; + pDst_pixels[3] = c[pBlock->get_selector(3, y)]; + } + } + else + { + for (uint32_t y = 0; y < 4; y++, pDst_pixels += 4) + { + pDst_pixels[0].set_rgb(c[pBlock->get_selector(0, y)]); + pDst_pixels[1].set_rgb(c[pBlock->get_selector(1, y)]); + pDst_pixels[2].set_rgb(c[pBlock->get_selector(2, y)]); + pDst_pixels[3].set_rgb(c[pBlock->get_selector(3, y)]); + } + } + + return used_punchthrough; + } + + void unpack_bc4(const void* pBlock_bits, uint8_t* pPixels, uint32_t stride) + { + static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8"); + + const bc4_block* pBlock = static_cast(pBlock_bits); + + uint8_t sel_values[8]; + bc4_block::get_block_values(sel_values, pBlock->get_low_alpha(), pBlock->get_high_alpha()); + + const uint64_t selector_bits = pBlock->get_selector_bits(); + + for (uint32_t y = 0; y < 4; y++, pPixels += (stride * 4U)) + { + pPixels[0] = sel_values[pBlock->get_selector(0, y, selector_bits)]; + pPixels[stride * 1] = sel_values[pBlock->get_selector(1, y, selector_bits)]; + pPixels[stride * 2] = sel_values[pBlock->get_selector(2, y, selector_bits)]; + pPixels[stride * 3] = sel_values[pBlock->get_selector(3, y, selector_bits)]; + } + } + + // Returns false if the block uses 3-color punchthrough alpha mode, which isn't supported on some GPU's for BC3. + bool unpack_bc3(const void* pBlock_bits, void* pPixels) + { + color32* pDst_pixels = static_cast(pPixels); + + bool success = true; + + if (unpack_bc1((const uint8_t*)pBlock_bits + sizeof(bc4_block), pDst_pixels, true)) + success = false; + + unpack_bc4(pBlock_bits, &pDst_pixels[0].a, sizeof(color32)); + + return success; + } + + // writes RG + void unpack_bc5(const void* pBlock_bits, void* pPixels, uint32_t chan0, uint32_t chan1, uint32_t stride) + { + unpack_bc4(pBlock_bits, (uint8_t *)pPixels + chan0, stride); + unpack_bc4((const uint8_t*)pBlock_bits + sizeof(bc4_block), (uint8_t *)pPixels + chan1, stride); + } + +} // namespace rgbcx + +#endif //#ifdef RGBCX_IMPLEMENTATION + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright(c) 2020 Richard Geldreich, Jr. +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files(the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions : +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain(www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non - commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain.We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors.We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ diff --git a/src/nvtt/tests/bc1enc.cpp b/src/nvtt/tests/bc1enc.cpp index 38e4766..912fdb8 100644 --- a/src/nvtt/tests/bc1enc.cpp +++ b/src/nvtt/tests/bc1enc.cpp @@ -10,6 +10,9 @@ #define STB_DXT_IMPLEMENTATION #include "stb_dxt.h" +#define RGBCX_IMPLEMENTATION +#include "../extern/rg/rgbcx.h" + #include "../extern/libsquish-1.15/squish.h" #include "../extern/CMP_Core/source/CMP_Core.h" @@ -31,15 +34,16 @@ typedef unsigned int u32; #define TEST_STB 1 #define TEST_STB_HQ 1 +#define TEST_RGBCX 1 + #define TEST_NVTT_FAST 1 -#define TEST_NVTT_GELD 0 #define TEST_NVTT 1 #define TEST_NVTT_HQ 1 -#define TEST_SQUISH 0 -#define TEST_SQUISH_HQ 0 +#define TEST_SQUISH 1 +#define TEST_SQUISH_HQ 1 -#define TEST_AMD_CMP 0 +#define TEST_AMD_CMP 1 @@ -151,7 +155,7 @@ bool output_dxt_dds (u32 w, u32 h, const u8* data, const char * filename) { dds.width = w; dds.height = h; - dds.pitch = 8 * ((w+3)/4 * (h+3)/4); // linear size + dds.pitch = 8 * (((w+3)/4) * ((h+3)/4)); // linear size FILE * fp = fopen(filename, "wb"); if (fp == nullptr) return false; @@ -242,13 +246,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("stb_dxt \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "stb_dxt.dds"); - stats->compressorName = "stb"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "stb"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "stb_dxt.dds"); + } } if (TEST_STB_HQ) { @@ -263,13 +270,42 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("stb_dxt hq \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); + + if (stats) { + stats->compressorName = "stb-hq"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "stb_dxt_hq.dds"); + } + } + + if (TEST_RGBCX) { + memset(block_data, 0, block_count * 8); + + rgbcx::encode_bc1_init(); + + timer.start(); + for (int i = 0; i < repeat_count; i++) { + for (int b = 0; b < block_count; b++) { + rgbcx::encode_bc1((block_data + b * 8), rgba_block_data + b * 4 * 4 * 4, rgbcx::LEVEL2_OPTIONS, rgbcx::DEFAULT_TOTAL_ORDERINGS_TO_TRY); + } + } + timer.stop(); + + float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //output_dxt_dds(bw, bh, block_data, "stb_dxt_hq.dds"); - stats->compressorName = "stb-hq"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "rgbcx"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "rgbcx.dds"); + } } if (TEST_NVTT_FAST) { @@ -295,35 +331,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("nvtt fast \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - - //output_dxt_dds(bw, bh, block_data, "nvtt_fast.dds"); - stats->compressorName = "nvtt-fast"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; - } - - if (TEST_NVTT_GELD) { - memset(block_data, 0, block_count * 8); - - timer.start(); - for (int i = 0; i < repeat_count; i++) { - for (int b = 0; b < block_count; b++) { - //compress_dxt1_fast2(rgba_block_data + b * 4 * 4 * 4, (BlockDXT1*)(block_data + b * 8)); - compress_dxt1_fast_geld(rgba_block_data + b * 4 * 4 * 4, (BlockDXT1*)(block_data + b * 8)); - } + + if (stats) { + stats->compressorName = "nvtt-fast"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "nvtt_fast.dds"); } - timer.stop(); - - float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("nvtt fast2 \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - - //output_dxt_dds(bw, bh, block_data, "nvtt_fast2.dds"); - stats->compressorName = "nvtt-geld"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; } if (TEST_NVTT) { @@ -349,13 +366,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("nvtt hq \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "nvtt_hq.dds"); - stats->compressorName = "nvtt"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "nvtt"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "nvtt.dds"); + } } if (TEST_NVTT_HQ) { @@ -381,13 +401,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("nvtt hq \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "nvtt_hq.dds"); - stats->compressorName = "nvtt-hq"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "nvtt-hq"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "nvtt_hq.dds"); + } } if (TEST_SQUISH) { @@ -402,13 +425,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("squish \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "squish.dds"); - stats->compressorName = "squish"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "squish"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "squish.dds"); + } } if (TEST_SQUISH_HQ) { @@ -423,13 +449,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("squish hq\t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "squish_hq.dds"); - stats->compressorName = "squish-hq"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "squish-hq"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "squish_hq.dds"); + } } if (TEST_AMD_CMP) { @@ -444,13 +473,16 @@ bool test_bc1(const char * inputFileName, int index, Stats * stats) { timer.stop(); float mse = evaluate_dxt1_mse(rgba_block_data, block_data, block_count); - //printf("squish \t%f\t-> %f %f\n", timer.elapsed(), sqrt(mse), mse_to_psnr(mse)); - //output_dxt_dds(bw, bh, block_data, "squish.dds"); - stats->compressorName = "cmp"; - stats->mseArray[index] = mse; - stats->timeArray[index] = timer.elapsed(); - stats++; + if (stats) { + stats->compressorName = "cmp"; + stats->mseArray[index] = mse; + stats->timeArray[index] = timer.elapsed(); + stats++; + } + else { + output_dxt_dds(bw, bh, block_data, "squish.dds"); + } } return false; @@ -621,6 +653,7 @@ const char * image_set[] = { "testsuite/waterloo/sail.png", "testsuite/waterloo/serrano.png", "testsuite/waterloo/tulips.png", + //"testsuite/artificial.png", }; const char * roblox_set[] = { @@ -667,19 +700,21 @@ const char * roblox_set[] = { int main(int argc, char *argv[]) { - const char * inputFileName = "testsuite/kodak/kodim14.png"; + const char * inputFileName = "testsuite/artificial.png"; + //const char * inputFileName = "testsuite/kodak/kodim14.png"; //const char * inputFileName = "testsuite/kodak/kodim18.png"; //const char * inputFileName = "testsuite/kodak/kodim15.png"; //const char * inputFileName = "testsuite/waterloo/frymire.png"; + //const char * inputFileName = "Roblox/leafygrass_top/diffuse.tga"; - //test_bc1(inputFileName, 0); - analyze_bc1(inputFileName); + test_bc1(inputFileName, 0, NULL); + //analyze_bc1(inputFileName); - //const char ** set = roblox_set; - //int count = sizeof(roblox_set) / sizeof(char*); + const char ** set = roblox_set; + int count = sizeof(roblox_set) / sizeof(char*); - const char ** set = image_set; - int count = sizeof(image_set) / sizeof(char*); + //const char ** set = image_set; + //int count = sizeof(image_set) / sizeof(char*); const int MAX_COMPRESSOR_COUNT = 16; Stats stats[MAX_COMPRESSOR_COUNT];