// basisu_transcoder_uastc.h #pragma once #include "basisu_transcoder_internal.h" namespace basist { struct color_quad_u8 { … }; const uint32_t TOTAL_UASTC_MODES = …; const uint32_t UASTC_MODE_INDEX_SOLID_COLOR = …; const uint32_t TOTAL_ASTC_BC7_COMMON_PARTITIONS2 = …; const uint32_t TOTAL_ASTC_BC6H_COMMON_PARTITIONS2 = …; // BC6H only supports only 5-bit pattern indices, BC7 supports 4-bit or 6-bit const uint32_t TOTAL_ASTC_BC7_COMMON_PARTITIONS3 = …; const uint32_t TOTAL_BC7_3_ASTC2_COMMON_PARTITIONS = …; 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 { … }; extern const astc_bc7_common_partition2_desc g_astc_bc7_common_partitions2[TOTAL_ASTC_BC7_COMMON_PARTITIONS2]; struct bc73_astc2_common_partition_desc { … }; 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 { … }; 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) { … } struct astc_block_desc { … }; const uint32_t BC7ENC_TOTAL_ASTC_RANGES = …; // See tables 81, 93, 18.13.Endpoint Unquantization const uint32_t TOTAL_ASTC_RANGES = …; extern const int g_astc_bise_range_table[TOTAL_ASTC_RANGES][3]; struct astc_quant_bin { … }; 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 = …; struct bc7_block { … }; struct bc7_optimization_results { … }; 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) { … } inline int get_bc7_color_index_size(int mode, int index_selection_bit) { … } inline int get_bc7_alpha_index_size(int mode, int index_selection_bit) { … } struct endpoint_err { … }; extern endpoint_err g_bc7_mode_6_optimal_endpoints[256][2]; // [c][pbit] const uint32_t BC7ENC_MODE_6_OPTIMAL_INDEX = …; extern endpoint_err g_bc7_mode_5_optimal_endpoints[256]; // [c] const uint32_t BC7ENC_MODE_5_OPTIMAL_INDEX = …; // 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 { … }; struct unpacked_uastc_block { … }; 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 { … }; 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
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