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diff --git a/transcoder/basisu_transcoder_uastc.h b/transcoder/basisu_transcoder_uastc.h
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+++ b/transcoder/basisu_transcoder_uastc.h
@@ -0,0 +1,294 @@
+// basisu_transcoder_uastc.h
+#pragma once
+#include "basisu_transcoder_internal.h"
+
+namespace basist
+{
+ struct color_quad_u8
+ {
+ uint8_t m_c[4];
+ };
+
+ const uint32_t TOTAL_UASTC_MODES = 19;
+ const uint32_t UASTC_MODE_INDEX_SOLID_COLOR = 8;
+
+ const uint32_t TOTAL_ASTC_BC7_COMMON_PARTITIONS2 = 30;
+ const uint32_t TOTAL_ASTC_BC7_COMMON_PARTITIONS3 = 11;
+ const uint32_t TOTAL_BC7_3_ASTC2_COMMON_PARTITIONS = 19;
+
+ extern const uint8_t g_uastc_mode_weight_bits[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_weight_ranges[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_endpoint_ranges[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_subsets[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_planes[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_comps[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_has_etc1_bias[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_has_bc1_hint0[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_has_bc1_hint1[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_has_alpha[TOTAL_UASTC_MODES];
+ extern const uint8_t g_uastc_mode_is_la[TOTAL_UASTC_MODES];
+
+ struct astc_bc7_common_partition2_desc
+ {
+ uint8_t m_bc7;
+ uint16_t m_astc;
+ bool m_invert;
+ };
+
+ extern const astc_bc7_common_partition2_desc g_astc_bc7_common_partitions2[TOTAL_ASTC_BC7_COMMON_PARTITIONS2];
+
+ struct bc73_astc2_common_partition_desc
+ {
+ uint8_t m_bc73;
+ uint16_t m_astc2;
+ uint8_t k; // 0-5 - how to modify the BC7 3-subset pattern to match the ASTC pattern (LSB=invert)
+ };
+
+ extern const bc73_astc2_common_partition_desc g_bc7_3_astc2_common_partitions[TOTAL_BC7_3_ASTC2_COMMON_PARTITIONS];
+
+ struct astc_bc7_common_partition3_desc
+ {
+ uint8_t m_bc7;
+ uint16_t m_astc;
+ uint8_t m_astc_to_bc7_perm; // converts ASTC to BC7 partition using g_astc_bc7_partition_index_perm_tables[][]
+ };
+
+ extern const astc_bc7_common_partition3_desc g_astc_bc7_common_partitions3[TOTAL_ASTC_BC7_COMMON_PARTITIONS3];
+
+ extern const uint8_t g_astc_bc7_patterns2[TOTAL_ASTC_BC7_COMMON_PARTITIONS2][16];
+ extern const uint8_t g_astc_bc7_patterns3[TOTAL_ASTC_BC7_COMMON_PARTITIONS3][16];
+ extern const uint8_t g_bc7_3_astc2_patterns2[TOTAL_BC7_3_ASTC2_COMMON_PARTITIONS][16];
+
+ extern const uint8_t g_astc_bc7_pattern2_anchors[TOTAL_ASTC_BC7_COMMON_PARTITIONS2][3];
+ extern const uint8_t g_astc_bc7_pattern3_anchors[TOTAL_ASTC_BC7_COMMON_PARTITIONS3][3];
+ extern const uint8_t g_bc7_3_astc2_patterns2_anchors[TOTAL_BC7_3_ASTC2_COMMON_PARTITIONS][3];
+
+ extern const uint32_t g_uastc_mode_huff_codes[TOTAL_UASTC_MODES + 1][2];
+
+ extern const uint8_t g_astc_to_bc7_partition_index_perm_tables[6][3];
+ extern const uint8_t g_bc7_to_astc_partition_index_perm_tables[6][3]; // inverse of g_astc_to_bc7_partition_index_perm_tables
+
+ extern const uint8_t* s_uastc_to_bc1_weights[6];
+
+ uint32_t bc7_convert_partition_index_3_to_2(uint32_t p, uint32_t k);
+
+ inline uint32_t astc_interpolate(uint32_t l, uint32_t h, uint32_t w, bool srgb)
+ {
+ if (srgb)
+ {
+ l = (l << 8) | 0x80;
+ h = (h << 8) | 0x80;
+ }
+ else
+ {
+ l = (l << 8) | l;
+ h = (h << 8) | h;
+ }
+
+ uint32_t k = (l * (64 - w) + h * w + 32) >> 6;
+
+ return k >> 8;
+ }
+
+ struct astc_block_desc
+ {
+ int m_weight_range; // weight BISE range
+
+ int m_subsets; // number of ASTC partitions
+ int m_partition_seed; // partition pattern seed
+ int m_cem; // color endpoint mode used by all subsets
+
+ int m_ccs; // color component selector (dual plane only)
+ bool m_dual_plane; // true if dual plane
+
+ // Weight and endpoint BISE values.
+ // Note these values are NOT linear, they must be BISE encoded. See Table 97 and Table 107.
+ uint8_t m_endpoints[18]; // endpoint values, in RR GG BB etc. order
+ uint8_t m_weights[64]; // weight index values, raster order, in P0 P1, P0 P1, etc. or P0, P0, P0, P0, etc. order
+ };
+
+ const uint32_t BC7ENC_TOTAL_ASTC_RANGES = 21;
+
+ // See tables 81, 93, 18.13.Endpoint Unquantization
+ const uint32_t TOTAL_ASTC_RANGES = 21;
+ extern const int g_astc_bise_range_table[TOTAL_ASTC_RANGES][3];
+
+ struct astc_quant_bin
+ {
+ uint8_t m_unquant; // unquantized value
+ uint8_t m_index; // sorted index
+ };
+
+ extern astc_quant_bin g_astc_unquant[BC7ENC_TOTAL_ASTC_RANGES][256]; // [ASTC encoded endpoint index]
+
+ int astc_get_levels(int range);
+ bool astc_is_valid_endpoint_range(uint32_t range);
+ uint32_t unquant_astc_endpoint(uint32_t packed_bits, uint32_t packed_trits, uint32_t packed_quints, uint32_t range);
+ uint32_t unquant_astc_endpoint_val(uint32_t packed_val, uint32_t range);
+
+ const uint8_t* get_anchor_indices(uint32_t subsets, uint32_t mode, uint32_t common_pattern, const uint8_t*& pPartition_pattern);
+
+ // BC7
+ const uint32_t BC7ENC_BLOCK_SIZE = 16;
+
+ struct bc7_block
+ {
+ uint64_t m_qwords[2];
+ };
+
+ struct bc7_optimization_results
+ {
+ uint32_t m_mode;
+ uint32_t m_partition;
+ uint8_t m_selectors[16];
+ uint8_t m_alpha_selectors[16];
+ color_quad_u8 m_low[3];
+ color_quad_u8 m_high[3];
+ uint32_t m_pbits[3][2];
+ uint32_t m_index_selector;
+ uint32_t m_rotation;
+ };
+
+ extern const uint32_t g_bc7_weights1[2];
+ extern const uint32_t g_bc7_weights2[4];
+ extern const uint32_t g_bc7_weights3[8];
+ extern const uint32_t g_bc7_weights4[16];
+ extern const uint32_t g_astc_weights4[16];
+ extern const uint32_t g_astc_weights5[32];
+ extern const uint32_t g_astc_weights_3levels[3];
+ extern const uint8_t g_bc7_partition1[16];
+ extern const uint8_t g_bc7_partition2[64 * 16];
+ extern const uint8_t g_bc7_partition3[64 * 16];
+ extern const uint8_t g_bc7_table_anchor_index_second_subset[64];
+ extern const uint8_t g_bc7_table_anchor_index_third_subset_1[64];
+ extern const uint8_t g_bc7_table_anchor_index_third_subset_2[64];
+ extern const uint8_t g_bc7_num_subsets[8];
+ extern const uint8_t g_bc7_partition_bits[8];
+ extern const uint8_t g_bc7_color_index_bitcount[8];
+ extern const uint8_t g_bc7_mode_has_p_bits[8];
+ extern const uint8_t g_bc7_mode_has_shared_p_bits[8];
+ extern const uint8_t g_bc7_color_precision_table[8];
+ extern const int8_t g_bc7_alpha_precision_table[8];
+ extern const uint8_t g_bc7_alpha_index_bitcount[8];
+
+ inline bool get_bc7_mode_has_seperate_alpha_selectors(int mode) { return (mode == 4) || (mode == 5); }
+ inline int get_bc7_color_index_size(int mode, int index_selection_bit) { return g_bc7_color_index_bitcount[mode] + index_selection_bit; }
+ inline int get_bc7_alpha_index_size(int mode, int index_selection_bit) { return g_bc7_alpha_index_bitcount[mode] - index_selection_bit; }
+
+ struct endpoint_err
+ {
+ uint16_t m_error; uint8_t m_lo; uint8_t m_hi;
+ };
+
+ extern endpoint_err g_bc7_mode_6_optimal_endpoints[256][2]; // [c][pbit]
+ const uint32_t BC7ENC_MODE_6_OPTIMAL_INDEX = 5;
+
+ extern endpoint_err g_bc7_mode_5_optimal_endpoints[256]; // [c]
+ const uint32_t BC7ENC_MODE_5_OPTIMAL_INDEX = 1;
+
+ // Packs a BC7 block from a high-level description. Handles all BC7 modes.
+ void encode_bc7_block(void* pBlock, const bc7_optimization_results* pResults);
+
+ // Packs an ASTC block
+ // Constraints: Always 4x4, all subset CEM's must be equal, only tested with LDR CEM's.
+ bool pack_astc_block(uint32_t* pDst, const astc_block_desc* pBlock, uint32_t mode);
+
+ void pack_astc_solid_block(void* pDst_block, const color32& color);
+
+#ifdef _DEBUG
+ int astc_compute_texel_partition(int seed, int x, int y, int z, int partitioncount, bool small_block);
+#endif
+
+ struct uastc_block
+ {
+ union
+ {
+ uint8_t m_bytes[16];
+ uint32_t m_dwords[4];
+ uint64_t m_qwords[2];
+ };
+ };
+
+ struct unpacked_uastc_block
+ {
+ astc_block_desc m_astc;
+
+ uint32_t m_mode;
+ uint32_t m_common_pattern;
+
+ color32 m_solid_color;
+
+ bool m_bc1_hint0;
+ bool m_bc1_hint1;
+
+ bool m_etc1_flip;
+ bool m_etc1_diff;
+ uint32_t m_etc1_inten0;
+ uint32_t m_etc1_inten1;
+
+ uint32_t m_etc1_bias;
+
+ uint32_t m_etc2_hints;
+
+ uint32_t m_etc1_selector;
+ uint32_t m_etc1_r, m_etc1_g, m_etc1_b;
+ };
+
+ color32 apply_etc1_bias(const color32 &block_color, uint32_t bias, uint32_t limit, uint32_t subblock);
+
+ struct decoder_etc_block;
+ struct eac_block;
+
+ bool unpack_uastc(uint32_t mode, uint32_t common_pattern, const color32& solid_color, const astc_block_desc& astc, color32* pPixels, bool srgb);
+ bool unpack_uastc(const unpacked_uastc_block& unpacked_blk, color32* pPixels, bool srgb);
+
+ bool unpack_uastc(const uastc_block& blk, color32* pPixels, bool srgb);
+ bool unpack_uastc(const uastc_block& blk, unpacked_uastc_block& unpacked, bool undo_blue_contract, bool read_hints = true);
+
+ bool transcode_uastc_to_astc(const uastc_block& src_blk, void* pDst);
+
+ bool transcode_uastc_to_bc7(const unpacked_uastc_block& unpacked_src_blk, bc7_optimization_results& dst_blk);
+ bool transcode_uastc_to_bc7(const uastc_block& src_blk, bc7_optimization_results& dst_blk);
+ bool transcode_uastc_to_bc7(const uastc_block& src_blk, void* pDst);
+
+ void transcode_uastc_to_etc1(unpacked_uastc_block& unpacked_src_blk, color32 block_pixels[4][4], void* pDst);
+ bool transcode_uastc_to_etc1(const uastc_block& src_blk, void* pDst);
+ bool transcode_uastc_to_etc1(const uastc_block& src_blk, void* pDst, uint32_t channel);
+
+ void transcode_uastc_to_etc2_eac_a8(unpacked_uastc_block& unpacked_src_blk, color32 block_pixels[4][4], void* pDst);
+ bool transcode_uastc_to_etc2_rgba(const uastc_block& src_blk, void* pDst);
+
+ // Packs 16 scalar values to BC4. Same PSNR as stb_dxt's BC4 encoder, around 13% faster.
+ void encode_bc4(void* pDst, const uint8_t* pPixels, uint32_t stride);
+
+ void encode_bc1_solid_block(void* pDst, uint32_t fr, uint32_t fg, uint32_t fb);
+
+ enum
+ {
+ cEncodeBC1HighQuality = 1,
+ cEncodeBC1HigherQuality = 2,
+ cEncodeBC1UseSelectors = 4,
+ };
+ void encode_bc1(void* pDst, const uint8_t* pPixels, uint32_t flags);
+
+ // Alternate PCA-free encoder, around 15% faster, same (or slightly higher) avg. PSNR
+ void encode_bc1_alt(void* pDst, const uint8_t* pPixels, uint32_t flags);
+
+ void transcode_uastc_to_bc1_hint0(const unpacked_uastc_block& unpacked_src_blk, void* pDst);
+ void transcode_uastc_to_bc1_hint1(const unpacked_uastc_block& unpacked_src_blk, const color32 block_pixels[4][4], void* pDst, bool high_quality);
+
+ bool transcode_uastc_to_bc1(const uastc_block& src_blk, void* pDst, bool high_quality);
+ bool transcode_uastc_to_bc3(const uastc_block& src_blk, void* pDst, bool high_quality);
+ bool transcode_uastc_to_bc4(const uastc_block& src_blk, void* pDst, bool high_quality, uint32_t chan0);
+ bool transcode_uastc_to_bc5(const uastc_block& src_blk, void* pDst, bool high_quality, uint32_t chan0, uint32_t chan1);
+
+ bool transcode_uastc_to_etc2_eac_r11(const uastc_block& src_blk, void* pDst, bool high_quality, uint32_t chan0);
+ bool transcode_uastc_to_etc2_eac_rg11(const uastc_block& src_blk, void* pDst, bool high_quality, uint32_t chan0, uint32_t chan1);
+
+ bool transcode_uastc_to_pvrtc1_4_rgb(const uastc_block* pSrc_blocks, void* pDst_blocks, uint32_t num_blocks_x, uint32_t num_blocks_y, bool high_quality, bool from_alpha);
+ bool transcode_uastc_to_pvrtc1_4_rgba(const uastc_block* pSrc_blocks, void* pDst_blocks, uint32_t num_blocks_x, uint32_t num_blocks_y, bool high_quality);
+
+ // uastc_init() MUST be called before using this module.
+ void uastc_init();
+
+} // namespace basist
\ No newline at end of file
