transcoder/basisu_transcoder.cpp

// basisu_transcoder.cpp
// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "basisu_transcoder.h"
#include <limits.h>
#include "basisu_containers_impl.h"

#ifndef BASISD_IS_BIG_ENDIAN
// TODO: This doesn't work on OSX. How can this be so difficult?
//#if defined(__BIG_ENDIAN__) || defined(_BIG_ENDIAN) || defined(BIG_ENDIAN)
//	#define BASISD_IS_BIG_ENDIAN (1)
//#else
	#define BASISD_IS_BIG_ENDIAN (0)
//#endif
#endif

#ifndef BASISD_USE_UNALIGNED_WORD_READS
	#ifdef __EMSCRIPTEN__
		// Can't use unaligned loads/stores with WebAssembly.
		#define BASISD_USE_UNALIGNED_WORD_READS (0)
	#elif defined(_M_AMD64) || defined(_M_IX86) || defined(__i386__) || defined(__x86_64__)
		#define BASISD_USE_UNALIGNED_WORD_READS (1)
	#else
		#define BASISD_USE_UNALIGNED_WORD_READS (0)
	#endif
#endif

#define BASISD_SUPPORTED_BASIS_VERSION (0x13)

#ifndef BASISD_SUPPORT_KTX2
	#error Must have defined BASISD_SUPPORT_KTX2
#endif

#ifndef BASISD_SUPPORT_KTX2_ZSTD
#error Must have defined BASISD_SUPPORT_KTX2_ZSTD
#endif

// Set to 1 for fuzz testing. This will disable all CRC16 checks on headers and compressed data.
#ifndef BASISU_NO_HEADER_OR_DATA_CRC16_CHECKS
	#define BASISU_NO_HEADER_OR_DATA_CRC16_CHECKS 0
#endif

#ifndef BASISD_SUPPORT_DXT1
	#define BASISD_SUPPORT_DXT1 1
#endif

#ifndef BASISD_SUPPORT_DXT5A
	#define BASISD_SUPPORT_DXT5A 1
#endif

// Disable all BC7 transcoders if necessary (useful when cross compiling to Javascript)
#if defined(BASISD_SUPPORT_BC7) && !BASISD_SUPPORT_BC7
	#ifndef BASISD_SUPPORT_BC7_MODE5
		#define BASISD_SUPPORT_BC7_MODE5 0
	#endif
#endif // !BASISD_SUPPORT_BC7

// BC7 mode 5 supports both opaque and opaque+alpha textures, and uses less memory BC1.
#ifndef BASISD_SUPPORT_BC7_MODE5
	#define BASISD_SUPPORT_BC7_MODE5 1
#endif

#ifndef BASISD_SUPPORT_PVRTC1
	#define BASISD_SUPPORT_PVRTC1 1
#endif

#ifndef BASISD_SUPPORT_ETC2_EAC_A8
	#define BASISD_SUPPORT_ETC2_EAC_A8 1
#endif

// Set BASISD_SUPPORT_UASTC to 0 to completely disable support for transcoding UASTC files.
#ifndef BASISD_SUPPORT_UASTC
	#define BASISD_SUPPORT_UASTC 1
#endif

#ifndef BASISD_SUPPORT_ASTC
	#define BASISD_SUPPORT_ASTC 1
#endif

// Note that if BASISD_SUPPORT_ATC is enabled, BASISD_SUPPORT_DXT5A should also be enabled for alpha support.
#ifndef BASISD_SUPPORT_ATC
	#define BASISD_SUPPORT_ATC 1
#endif

// Support for ETC2 EAC R11 and ETC2 EAC RG11
#ifndef BASISD_SUPPORT_ETC2_EAC_RG11
	#define BASISD_SUPPORT_ETC2_EAC_RG11 1
#endif

// If BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY is 1, opaque blocks will be transcoded to ASTC at slightly higher quality (higher than BC1), but the transcoder tables will be 2x as large.
// This impacts grayscale and grayscale+alpha textures the most.
#ifndef BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
	#ifdef __EMSCRIPTEN__
		// Let's assume size matters more than quality when compiling with emscripten.
		#define BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY 0
	#else
		// Compiling native, so an extra 64K lookup table is probably acceptable.
		#define BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY 1
	#endif
#endif

#ifndef BASISD_SUPPORT_FXT1
	#define BASISD_SUPPORT_FXT1 1
#endif

#ifndef BASISD_SUPPORT_PVRTC2
	#define BASISD_SUPPORT_PVRTC2 1
#endif

#if BASISD_SUPPORT_PVRTC2
	#if !BASISD_SUPPORT_ATC
		#error BASISD_SUPPORT_ATC must be 1 if BASISD_SUPPORT_PVRTC2 is 1
	#endif
#endif

#if BASISD_SUPPORT_ATC
	#if !BASISD_SUPPORT_DXT5A
		#error BASISD_SUPPORT_DXT5A must be 1 if BASISD_SUPPORT_ATC is 1
	#endif
#endif

#define BASISD_WRITE_NEW_BC7_MODE5_TABLES			0
#define BASISD_WRITE_NEW_DXT1_TABLES				0
#define BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES		0
#define BASISD_WRITE_NEW_ASTC_TABLES				0
#define BASISD_WRITE_NEW_ATC_TABLES					0
#define BASISD_WRITE_NEW_ETC2_EAC_R11_TABLES		0

#ifndef BASISD_ENABLE_DEBUG_FLAGS
	#define BASISD_ENABLE_DEBUG_FLAGS	0
#endif

// If KTX2 support is enabled, we may need Zstd for decompression of supercompressed UASTC files. Include this header.
#if BASISD_SUPPORT_KTX2
   // If BASISD_SUPPORT_KTX2_ZSTD is 0, UASTC files compressed with Zstd cannot be loaded.
	#if BASISD_SUPPORT_KTX2_ZSTD
		// We only use two Zstd API's: ZSTD_decompress() and ZSTD_isError()
		#include "../zstd/zstd.h"
	#endif
#endif

namespace basisu
{
	bool g_debug_printf;

	void enable_debug_printf(bool enabled)
	{
		g_debug_printf = enabled;
	}

	void debug_printf(const char* pFmt, ...)
	{
#if BASISU_FORCE_DEVEL_MESSAGES	
		g_debug_printf = true;
#endif
		if (g_debug_printf)
		{
			va_list args;
			va_start(args, pFmt);
			vprintf(pFmt, args);
			va_end(args);
		}
	}
} // namespace basisu

namespace basist
{

#if BASISD_ENABLE_DEBUG_FLAGS
	static uint32_t g_debug_flags = 0;
#endif

	uint32_t get_debug_flags()
	{
#if BASISD_ENABLE_DEBUG_FLAGS
		return g_debug_flags;
#else
		return 0;
#endif
	}

	void set_debug_flags(uint32_t f)
	{
		BASISU_NOTE_UNUSED(f);
#if BASISD_ENABLE_DEBUG_FLAGS
		g_debug_flags = f;
#endif
	}

	inline uint16_t byteswap_uint16(uint16_t v)
	{
		return static_cast<uint16_t>((v >> 8) | (v << 8));
	}

	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 float clampf(float value, float low, float high) { if (value < low) value = low; else if (value > high) value = high;	return value; }
	static inline float saturate(float value) { return clampf(value, 0, 1.0f); }

	static inline uint8_t mul_8(uint32_t v, uint32_t q) { v = v * q + 128; return (uint8_t)((v + (v >> 8)) >> 8); }

	uint16_t crc16(const void* r, size_t size, uint16_t crc)
	{
		crc = ~crc;

		const uint8_t* p = static_cast<const uint8_t*>(r);
		for (; size; --size)
		{
			const uint16_t q = *p++ ^ (crc >> 8);
			uint16_t k = (q >> 4) ^ q;
			crc = (((crc << 8) ^ k) ^ (k << 5)) ^ (k << 12);
		}

		return static_cast<uint16_t>(~crc);
	}
		
	enum etc_constants
	{
		cETC1BytesPerBlock = 8U,

		cETC1SelectorBits = 2U,
		cETC1SelectorValues = 1U << cETC1SelectorBits,
		cETC1SelectorMask = cETC1SelectorValues - 1U,

		cETC1BlockShift = 2U,
		cETC1BlockSize = 1U << cETC1BlockShift,

		cETC1LSBSelectorIndicesBitOffset = 0,
		cETC1MSBSelectorIndicesBitOffset = 16,

		cETC1FlipBitOffset = 32,
		cETC1DiffBitOffset = 33,

		cETC1IntenModifierNumBits = 3,
		cETC1IntenModifierValues = 1 << cETC1IntenModifierNumBits,
		cETC1RightIntenModifierTableBitOffset = 34,
		cETC1LeftIntenModifierTableBitOffset = 37,

		// Base+Delta encoding (5 bit bases, 3 bit delta)
		cETC1BaseColorCompNumBits = 5,
		cETC1BaseColorCompMax = 1 << cETC1BaseColorCompNumBits,

		cETC1DeltaColorCompNumBits = 3,
		cETC1DeltaColorComp = 1 << cETC1DeltaColorCompNumBits,
		cETC1DeltaColorCompMax = 1 << cETC1DeltaColorCompNumBits,

		cETC1BaseColor5RBitOffset = 59,
		cETC1BaseColor5GBitOffset = 51,
		cETC1BaseColor5BBitOffset = 43,

		cETC1DeltaColor3RBitOffset = 56,
		cETC1DeltaColor3GBitOffset = 48,
		cETC1DeltaColor3BBitOffset = 40,

		// Absolute (non-delta) encoding (two 4-bit per component bases)
		cETC1AbsColorCompNumBits = 4,
		cETC1AbsColorCompMax = 1 << cETC1AbsColorCompNumBits,

		cETC1AbsColor4R1BitOffset = 60,
		cETC1AbsColor4G1BitOffset = 52,
		cETC1AbsColor4B1BitOffset = 44,

		cETC1AbsColor4R2BitOffset = 56,
		cETC1AbsColor4G2BitOffset = 48,
		cETC1AbsColor4B2BitOffset = 40,

		cETC1ColorDeltaMin = -4,
		cETC1ColorDeltaMax = 3,

		// Delta3:
		// 0   1   2   3   4   5   6   7
		// 000 001 010 011 100 101 110 111
		// 0   1   2   3   -4  -3  -2  -1
	};

#define DECLARE_ETC1_INTEN_TABLE(name, N) \
	static const int name[cETC1IntenModifierValues][cETC1SelectorValues] = \
	{ \
		{ N * -8,  N * -2,   N * 2,   N * 8 },{ N * -17,  N * -5,  N * 5,  N * 17 },{ N * -29,  N * -9,   N * 9,  N * 29 },{ N * -42, N * -13, N * 13,  N * 42 }, \
		{ N * -60, N * -18, N * 18,  N * 60 },{ N * -80, N * -24, N * 24,  N * 80 },{ N * -106, N * -33, N * 33, N * 106 },{ N * -183, N * -47, N * 47, N * 183 } \
	};

	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables, 1);
	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables16, 16);
	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables48, 3 * 16);

	//const uint8_t g_etc1_to_selector_index[cETC1SelectorValues] = { 2, 3, 1, 0 };
	const uint8_t g_selector_index_to_etc1[cETC1SelectorValues] = { 3, 2, 0, 1 };
	
	static const uint8_t g_etc_5_to_8[32] = { 0, 8, 16, 24, 33, 41, 49, 57, 66, 74, 82, 90, 99, 107, 115, 123, 132, 140, 148, 156, 165, 173, 181, 189, 198, 206, 214, 222, 231, 239, 247, 255 };

	struct decoder_etc_block
	{
		// big endian uint64:
		// bit ofs:  56  48  40  32  24  16   8   0
		// byte ofs: b0, b1, b2, b3, b4, b5, b6, b7 
		union
		{
			uint64_t m_uint64;

			uint32_t m_uint32[2];

			uint8_t m_bytes[8];

			struct
			{
				signed m_dred2 : 3;
				uint32_t m_red1 : 5;

				signed m_dgreen2 : 3;
				uint32_t m_green1 : 5;

				signed m_dblue2 : 3;
				uint32_t m_blue1 : 5;

				uint32_t m_flip : 1;
				uint32_t m_diff : 1;
				uint32_t m_cw2 : 3;
				uint32_t m_cw1 : 3;

				uint32_t m_selectors;
			} m_differential;
		};

		inline void clear()
		{
			assert(sizeof(*this) == 8);
			basisu::clear_obj(*this);
		}

		inline void set_byte_bits(uint32_t ofs, uint32_t num, uint32_t bits)
		{
			assert((ofs + num) <= 64U);
			assert(num && (num < 32U));
			assert((ofs >> 3) == ((ofs + num - 1) >> 3));
			assert(bits < (1U << num));
			const uint32_t byte_ofs = 7 - (ofs >> 3);
			const uint32_t byte_bit_ofs = ofs & 7;
			const uint32_t mask = (1 << num) - 1;
			m_bytes[byte_ofs] &= ~(mask << byte_bit_ofs);
			m_bytes[byte_ofs] |= (bits << byte_bit_ofs);
		}

		inline void set_flip_bit(bool flip)
		{
			m_bytes[3] &= ~1;
			m_bytes[3] |= static_cast<uint8_t>(flip);
		}

		inline void set_diff_bit(bool diff)
		{
			m_bytes[3] &= ~2;
			m_bytes[3] |= (static_cast<uint32_t>(diff) << 1);
		}

		// Sets intensity modifier table (0-7) used by subblock subblock_id (0 or 1)
		inline void set_inten_table(uint32_t subblock_id, uint32_t t)
		{
			assert(subblock_id < 2);
			assert(t < 8);
			const uint32_t ofs = subblock_id ? 2 : 5;
			m_bytes[3] &= ~(7 << ofs);
			m_bytes[3] |= (t << ofs);
		}

		// Selector "val" ranges from 0-3 and is a direct index into g_etc1_inten_tables.
		inline void set_selector(uint32_t x, uint32_t y, uint32_t val)
		{
			assert((x | y | val) < 4);
			const uint32_t bit_index = x * 4 + y;

			uint8_t* p = &m_bytes[7 - (bit_index >> 3)];

			const uint32_t byte_bit_ofs = bit_index & 7;
			const uint32_t mask = 1 << byte_bit_ofs;

			static const uint8_t s_selector_index_to_etc1[4] = { 3, 2, 0, 1 };
			const uint32_t etc1_val = s_selector_index_to_etc1[val];

			const uint32_t lsb = etc1_val & 1;
			const uint32_t msb = etc1_val >> 1;

			p[0] &= ~mask;
			p[0] |= (lsb << byte_bit_ofs);

			p[-2] &= ~mask;
			p[-2] |= (msb << byte_bit_ofs);
		}

		// Returned encoded selector value ranges from 0-3 (this is NOT a direct index into g_etc1_inten_tables, see get_selector())
		inline uint32_t get_raw_selector(uint32_t x, uint32_t y) const
		{
			assert((x | y) < 4);

			const uint32_t bit_index = x * 4 + y;
			const uint32_t byte_bit_ofs = bit_index & 7;
			const uint8_t* p = &m_bytes[7 - (bit_index >> 3)];
			const uint32_t lsb = (p[0] >> byte_bit_ofs) & 1;
			const uint32_t msb = (p[-2] >> byte_bit_ofs) & 1;
			const uint32_t val = lsb | (msb << 1);

			return val;
		}

		// Returned selector value ranges from 0-3 and is a direct index into g_etc1_inten_tables.
		inline uint32_t get_selector(uint32_t x, uint32_t y) const
		{
			static const uint8_t s_etc1_to_selector_index[cETC1SelectorValues] = { 2, 3, 1, 0 };
			return s_etc1_to_selector_index[get_raw_selector(x, y)];
		}

		inline void set_raw_selector_bits(uint32_t bits)
		{
			m_bytes[4] = static_cast<uint8_t>(bits);
			m_bytes[5] = static_cast<uint8_t>(bits >> 8);
			m_bytes[6] = static_cast<uint8_t>(bits >> 16);
			m_bytes[7] = static_cast<uint8_t>(bits >> 24);
		}

		inline bool are_all_selectors_the_same() const
		{
			uint32_t v = *reinterpret_cast<const uint32_t*>(&m_bytes[4]);

			if ((v == 0xFFFFFFFF) || (v == 0xFFFF) || (!v) || (v == 0xFFFF0000))
				return true;

			return false;
		}

		inline void set_raw_selector_bits(uint8_t byte0, uint8_t byte1, uint8_t byte2, uint8_t byte3)
		{
			m_bytes[4] = byte0;
			m_bytes[5] = byte1;
			m_bytes[6] = byte2;
			m_bytes[7] = byte3;
		}

		inline uint32_t get_raw_selector_bits() const
		{
			return m_bytes[4] | (m_bytes[5] << 8) | (m_bytes[6] << 16) | (m_bytes[7] << 24);
		}

		inline void set_base4_color(uint32_t idx, uint16_t c)
		{
			if (idx)
			{
				set_byte_bits(cETC1AbsColor4R2BitOffset, 4, (c >> 8) & 15);
				set_byte_bits(cETC1AbsColor4G2BitOffset, 4, (c >> 4) & 15);
				set_byte_bits(cETC1AbsColor4B2BitOffset, 4, c & 15);
			}
			else
			{
				set_byte_bits(cETC1AbsColor4R1BitOffset, 4, (c >> 8) & 15);
				set_byte_bits(cETC1AbsColor4G1BitOffset, 4, (c >> 4) & 15);
				set_byte_bits(cETC1AbsColor4B1BitOffset, 4, c & 15);
			}
		}

		inline void set_base5_color(uint16_t c)
		{
			set_byte_bits(cETC1BaseColor5RBitOffset, 5, (c >> 10) & 31);
			set_byte_bits(cETC1BaseColor5GBitOffset, 5, (c >> 5) & 31);
			set_byte_bits(cETC1BaseColor5BBitOffset, 5, c & 31);
		}

		void set_delta3_color(uint16_t c)
		{
			set_byte_bits(cETC1DeltaColor3RBitOffset, 3, (c >> 6) & 7);
			set_byte_bits(cETC1DeltaColor3GBitOffset, 3, (c >> 3) & 7);
			set_byte_bits(cETC1DeltaColor3BBitOffset, 3, c & 7);
		}

		void set_block_color4(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(false);

			set_base4_color(0, pack_color4(c0_unscaled, false));
			set_base4_color(1, pack_color4(c1_unscaled, false));
		}

		void set_block_color5(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(true);

			set_base5_color(pack_color5(c0_unscaled, false));

			int dr = c1_unscaled.r - c0_unscaled.r;
			int dg = c1_unscaled.g - c0_unscaled.g;
			int db = c1_unscaled.b - c0_unscaled.b;

			set_delta3_color(pack_delta3(dr, dg, db));
		}

		bool set_block_color5_check(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(true);

			set_base5_color(pack_color5(c0_unscaled, false));

			int dr = c1_unscaled.r - c0_unscaled.r;
			int dg = c1_unscaled.g - c0_unscaled.g;
			int db = c1_unscaled.b - c0_unscaled.b;

			if (((dr < cETC1ColorDeltaMin) || (dr > cETC1ColorDeltaMax)) ||
				((dg < cETC1ColorDeltaMin) || (dg > cETC1ColorDeltaMax)) ||
				((db < cETC1ColorDeltaMin) || (db > cETC1ColorDeltaMax)))
				return false;

			set_delta3_color(pack_delta3(dr, dg, db));

			return true;
		}

		inline uint32_t get_byte_bits(uint32_t ofs, uint32_t num) const
		{
			assert((ofs + num) <= 64U);
			assert(num && (num <= 8U));
			assert((ofs >> 3) == ((ofs + num - 1) >> 3));
			const uint32_t byte_ofs = 7 - (ofs >> 3);
			const uint32_t byte_bit_ofs = ofs & 7;
			return (m_bytes[byte_ofs] >> byte_bit_ofs) & ((1 << num) - 1);
		}

		inline uint16_t get_base5_color() const
		{
			const uint32_t r = get_byte_bits(cETC1BaseColor5RBitOffset, 5);
			const uint32_t g = get_byte_bits(cETC1BaseColor5GBitOffset, 5);
			const uint32_t b = get_byte_bits(cETC1BaseColor5BBitOffset, 5);
			return static_cast<uint16_t>(b | (g << 5U) | (r << 10U));
		}

		inline uint16_t get_base4_color(uint32_t idx) const
		{
			uint32_t r, g, b;
			if (idx)
			{
				r = get_byte_bits(cETC1AbsColor4R2BitOffset, 4);
				g = get_byte_bits(cETC1AbsColor4G2BitOffset, 4);
				b = get_byte_bits(cETC1AbsColor4B2BitOffset, 4);
			}
			else
			{
				r = get_byte_bits(cETC1AbsColor4R1BitOffset, 4);
				g = get_byte_bits(cETC1AbsColor4G1BitOffset, 4);
				b = get_byte_bits(cETC1AbsColor4B1BitOffset, 4);
			}
			return static_cast<uint16_t>(b | (g << 4U) | (r << 8U));
		}

		inline color32 get_base5_color_unscaled() const
		{
			return color32(m_differential.m_red1, m_differential.m_green1, m_differential.m_blue1, 255);
		}

		inline bool get_flip_bit() const
		{
			return (m_bytes[3] & 1) != 0;
		}

		inline bool get_diff_bit() const
		{
			return (m_bytes[3] & 2) != 0;
		}
				
		inline uint32_t get_inten_table(uint32_t subblock_id) const
		{
			assert(subblock_id < 2);
			const uint32_t ofs = subblock_id ? 2 : 5;
			return (m_bytes[3] >> ofs) & 7;
		}

		inline uint16_t get_delta3_color() const
		{
			const uint32_t r = get_byte_bits(cETC1DeltaColor3RBitOffset, 3);
			const uint32_t g = get_byte_bits(cETC1DeltaColor3GBitOffset, 3);
			const uint32_t b = get_byte_bits(cETC1DeltaColor3BBitOffset, 3);
			return static_cast<uint16_t>(b | (g << 3U) | (r << 6U));
		}
		
		void get_block_colors(color32* pBlock_colors, uint32_t subblock_index) const
		{
			color32 b;

			if (get_diff_bit())
			{
				if (subblock_index)
					unpack_color5(b, get_base5_color(), get_delta3_color(), true, 255);
				else
					unpack_color5(b, get_base5_color(), true);
			}
			else
			{
				b = unpack_color4(get_base4_color(subblock_index), true, 255);
			}

			const int* pInten_table = g_etc1_inten_tables[get_inten_table(subblock_index)];

			pBlock_colors[0].set_noclamp_rgba(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
			pBlock_colors[1].set_noclamp_rgba(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
			pBlock_colors[2].set_noclamp_rgba(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
			pBlock_colors[3].set_noclamp_rgba(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
		}

		static uint16_t pack_color4(const color32& color, bool scaled, uint32_t bias = 127U)
		{
			return pack_color4(color.r, color.g, color.b, scaled, bias);
		}

		static uint16_t pack_color4(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U)
		{
			if (scaled)
			{
				r = (r * 15U + bias) / 255U;
				g = (g * 15U + bias) / 255U;
				b = (b * 15U + bias) / 255U;
			}

			r = basisu::minimum(r, 15U);
			g = basisu::minimum(g, 15U);
			b = basisu::minimum(b, 15U);

			return static_cast<uint16_t>(b | (g << 4U) | (r << 8U));
		}

		static uint16_t pack_color5(const color32& color, bool scaled, uint32_t bias = 127U)
		{
			return pack_color5(color.r, color.g, color.b, scaled, bias);
		}

		static uint16_t pack_color5(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U)
		{
			if (scaled)
			{
				r = (r * 31U + bias) / 255U;
				g = (g * 31U + bias) / 255U;
				b = (b * 31U + bias) / 255U;
			}

			r = basisu::minimum(r, 31U);
			g = basisu::minimum(g, 31U);
			b = basisu::minimum(b, 31U);

			return static_cast<uint16_t>(b | (g << 5U) | (r << 10U));
		}

		uint16_t pack_delta3(const color32& color)
		{
			return pack_delta3(color.r, color.g, color.b);
		}

		uint16_t pack_delta3(int r, int g, int b)
		{
			assert((r >= cETC1ColorDeltaMin) && (r <= cETC1ColorDeltaMax));
			assert((g >= cETC1ColorDeltaMin) && (g <= cETC1ColorDeltaMax));
			assert((b >= cETC1ColorDeltaMin) && (b <= cETC1ColorDeltaMax));
			if (r < 0) r += 8;
			if (g < 0) g += 8;
			if (b < 0) b += 8;
			return static_cast<uint16_t>(b | (g << 3) | (r << 6));
		}

		static void unpack_delta3(int& r, int& g, int& b, uint16_t packed_delta3)
		{
			r = (packed_delta3 >> 6) & 7;
			g = (packed_delta3 >> 3) & 7;
			b = packed_delta3 & 7;
			if (r >= 4) r -= 8;
			if (g >= 4) g -= 8;
			if (b >= 4) b -= 8;
		}

		static color32 unpack_color5(uint16_t packed_color5, bool scaled, uint32_t alpha)
		{
			uint32_t b = packed_color5 & 31U;
			uint32_t g = (packed_color5 >> 5U) & 31U;
			uint32_t r = (packed_color5 >> 10U) & 31U;

			if (scaled)
			{
				b = (b << 3U) | (b >> 2U);
				g = (g << 3U) | (g >> 2U);
				r = (r << 3U) | (r >> 2U);
			}

			assert(alpha <= 255);

			return color32(cNoClamp, r, g, b, alpha);
		}

		static void unpack_color5(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color5, bool scaled)
		{
			color32 c(unpack_color5(packed_color5, scaled, 0));
			r = c.r;
			g = c.g;
			b = c.b;
		}
				
		static void unpack_color5(color32& result, uint16_t packed_color5, bool scaled)
		{
			result = unpack_color5(packed_color5, scaled, 255);
		}

		static bool unpack_color5(color32& result, uint16_t packed_color5, uint16_t packed_delta3, bool scaled, uint32_t alpha)
		{
			int dr, dg, db;
			unpack_delta3(dr, dg, db, packed_delta3);

			int r = ((packed_color5 >> 10U) & 31U) + dr;
			int g = ((packed_color5 >> 5U) & 31U) + dg;
			int b = (packed_color5 & 31U) + db;

			bool success = true;
			if (static_cast<uint32_t>(r | g | b) > 31U)
			{
				success = false;
				r = basisu::clamp<int>(r, 0, 31);
				g = basisu::clamp<int>(g, 0, 31);
				b = basisu::clamp<int>(b, 0, 31);
			}

			if (scaled)
			{
				b = (b << 3U) | (b >> 2U);
				g = (g << 3U) | (g >> 2U);
				r = (r << 3U) | (r >> 2U);
			}

			result.set_noclamp_rgba(r, g, b, basisu::minimum(alpha, 255U));
			return success;
		}

		static color32 unpack_color4(uint16_t packed_color4, bool scaled, uint32_t alpha)
		{
			uint32_t b = packed_color4 & 15U;
			uint32_t g = (packed_color4 >> 4U) & 15U;
			uint32_t r = (packed_color4 >> 8U) & 15U;

			if (scaled)
			{
				b = (b << 4U) | b;
				g = (g << 4U) | g;
				r = (r << 4U) | r;
			}

			return color32(cNoClamp, r, g, b, basisu::minimum(alpha, 255U));
		}

		static void unpack_color4(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color4, bool scaled)
		{
			color32 c(unpack_color4(packed_color4, scaled, 0));
			r = c.r;
			g = c.g;
			b = c.b;
		}

		static void get_diff_subblock_colors(color32* pDst, uint16_t packed_color5, uint32_t table_idx)
		{
			assert(table_idx < cETC1IntenModifierValues);
			const int* pInten_modifer_table = &g_etc1_inten_tables[table_idx][0];

			uint32_t r, g, b;
			unpack_color5(r, g, b, packed_color5, true);

			const int ir = static_cast<int>(r), ig = static_cast<int>(g), ib = static_cast<int>(b);

			const int y0 = pInten_modifer_table[0];
			pDst[0].set(clamp255(ir + y0), clamp255(ig + y0), clamp255(ib + y0), 255);

			const int y1 = pInten_modifer_table[1];
			pDst[1].set(clamp255(ir + y1), clamp255(ig + y1), clamp255(ib + y1), 255);

			const int y2 = pInten_modifer_table[2];
			pDst[2].set(clamp255(ir + y2), clamp255(ig + y2), clamp255(ib + y2), 255);

			const int y3 = pInten_modifer_table[3];
			pDst[3].set(clamp255(ir + y3), clamp255(ig + y3), clamp255(ib + y3), 255);
		}

		static int clamp255(int x)
		{
			if (x & 0xFFFFFF00)
			{
				if (x < 0)
					x = 0;
				else if (x > 255)
					x = 255;
			}

			return x;
		}

		static void get_block_colors5(color32* pBlock_colors, const color32& base_color5, uint32_t inten_table)
		{
			color32 b(base_color5);

			b.r = (b.r << 3) | (b.r >> 2);
			b.g = (b.g << 3) | (b.g >> 2);
			b.b = (b.b << 3) | (b.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
			pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
			pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
			pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
		}

		static void get_block_color5(const color32& base_color5, uint32_t inten_table, uint32_t index, uint32_t& r, uint32_t &g, uint32_t &b)
		{
			assert(index < 4);

			uint32_t br = (base_color5.r << 3) | (base_color5.r >> 2);
			uint32_t bg = (base_color5.g << 3) | (base_color5.g >> 2);
			uint32_t bb = (base_color5.b << 3) | (base_color5.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			r = clamp255(br + pInten_table[index]);
			g = clamp255(bg + pInten_table[index]);
			b = clamp255(bb + pInten_table[index]);
		}

		static void get_block_color5_r(const color32& base_color5, uint32_t inten_table, uint32_t index, uint32_t &r)
		{
			assert(index < 4);
						
			uint32_t br = (base_color5.r << 3) | (base_color5.r >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			r = clamp255(br + pInten_table[index]);
		}

		static void get_block_colors5_g(int* pBlock_colors, const color32& base_color5, uint32_t inten_table)
		{
			const int g = (base_color5.g << 3) | (base_color5.g >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0] = clamp255(g + pInten_table[0]);
			pBlock_colors[1] = clamp255(g + pInten_table[1]);
			pBlock_colors[2] = clamp255(g + pInten_table[2]);
			pBlock_colors[3] = clamp255(g + pInten_table[3]);
		}

		static void get_block_colors5_bounds(color32* pBlock_colors, const color32& base_color5, uint32_t inten_table, uint32_t l = 0, uint32_t h = 3)
		{
			color32 b(base_color5);

			b.r = (b.r << 3) | (b.r >> 2);
			b.g = (b.g << 3) | (b.g >> 2);
			b.b = (b.b << 3) | (b.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0].set(clamp255(b.r + pInten_table[l]), clamp255(b.g + pInten_table[l]), clamp255(b.b + pInten_table[l]), 255);
			pBlock_colors[1].set(clamp255(b.r + pInten_table[h]), clamp255(b.g + pInten_table[h]), clamp255(b.b + pInten_table[h]), 255);
		}

		static void get_block_colors5_bounds_g(uint32_t* pBlock_colors, const color32& base_color5, uint32_t inten_table, uint32_t l = 0, uint32_t h = 3)
		{
			color32 b(base_color5);

			b.g = (b.g << 3) | (b.g >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0] = clamp255(b.g + pInten_table[l]);
			pBlock_colors[1] = clamp255(b.g + pInten_table[h]);
		}
	};

	enum dxt_constants
	{
		cDXT1SelectorBits = 2U, cDXT1SelectorValues = 1U << cDXT1SelectorBits, cDXT1SelectorMask = cDXT1SelectorValues - 1U,
		cDXT5SelectorBits = 3U, cDXT5SelectorValues = 1U << cDXT5SelectorBits, cDXT5SelectorMask = cDXT5SelectorValues - 1U,
	};

	static const uint8_t g_etc1_x_selector_unpack[4][256] =
	{
		{
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
		},
		{
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
		},

		{
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
		},

		{
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
		}
	};

	struct dxt1_block
	{
		enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 };

		uint8_t m_low_color[cTotalEndpointBytes];
		uint8_t m_high_color[cTotalEndpointBytes];
		uint8_t m_selectors[cTotalSelectorBytes];

		inline void clear() { basisu::clear_obj(*this); }

		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<uint8_t>(c & 0xFF); m_low_color[1] = static_cast<uint8_t>((c >> 8) & 0xFF); }
		inline void set_high_color(uint16_t c) { m_high_color[0] = static_cast<uint8_t>(c & 0xFF); m_high_color[1] = static_cast<uint8_t>((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<uint16_t>(basisu::minimum(b, 31U) | (basisu::minimum(g, 63U) << 5U) | (basisu::minimum(r, 31U) << 11U));
		}

		static uint16_t pack_unscaled_color(uint32_t r, uint32_t g, uint32_t b) { return static_cast<uint16_t>(b | (g << 5U) | (r << 11U)); }
	};

	struct dxt_selector_range
	{
		uint32_t m_low;
		uint32_t m_high;
	};

	struct etc1_to_dxt1_56_solution
	{
		uint8_t m_lo;
		uint8_t m_hi;
		uint16_t m_err;
	};

#if BASISD_SUPPORT_DXT1
	static dxt_selector_range g_etc1_to_dxt1_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },

		{ 2, 3 },
		{ 0, 1 },
	};

	const uint32_t NUM_ETC1_TO_DXT1_SELECTOR_RANGES = sizeof(g_etc1_to_dxt1_selector_ranges) / sizeof(g_etc1_to_dxt1_selector_ranges[0]);

	static uint32_t g_etc1_to_dxt1_selector_range_index[4][4];

	const uint32_t NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS = 10;
	static const uint8_t g_etc1_to_dxt1_selector_mappings[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][4] =
	{
		{ 0, 0, 1, 1 },
		{ 0, 0, 1, 2 },
		{ 0, 0, 1, 3 },
		{ 0, 0, 2, 3 },
		{ 0, 1, 1, 1 },
		{ 0, 1, 2, 2 },
		{ 0, 1, 2, 3 },
		{ 0, 2, 3, 3 },
		{ 1, 2, 2, 2 },
		{ 1, 2, 3, 3 },
	};
	
	static uint8_t g_etc1_to_dxt1_selector_mappings_raw_dxt1_256[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][256];
	static uint8_t g_etc1_to_dxt1_selector_mappings_raw_dxt1_inv_256[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][256];

	static const etc1_to_dxt1_56_solution g_etc1_to_dxt_6[32 * 8 * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS * NUM_ETC1_TO_DXT1_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_dxt1_6.inc"
	};

	static const etc1_to_dxt1_56_solution g_etc1_to_dxt_5[32 * 8 * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS * NUM_ETC1_TO_DXT1_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_dxt1_5.inc"
	};
#endif // BASISD_SUPPORT_DXT1

#if BASISD_SUPPORT_DXT1 || BASISD_SUPPORT_UASTC
	// First saw the idea for optimal BC1 single-color block encoding using lookup tables in ryg_dxt.
	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 bc1_match_entry g_bc1_match5_equals_0[256], g_bc1_match6_equals_0[256]; // selector 0, 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 = basisu::iabs(((hi_e * 2 + lo_e) / 3) - i);
						e += (basisu::iabs(hi_e - lo_e) * 3) / 100;
					}
					else
					{
						assert(sel == 0);

						// Selector 0
						e = basisu::iabs(hi_e - i);
					}

					if (e < lowest_e)
					{
						pTable[i].m_hi = static_cast<uint8_t>(hi);
						pTable[i].m_lo = static_cast<uint8_t>(lo);

						lowest_e = e;
					}

				} // hi
			} // lo
		}
	}
#endif

#if BASISD_WRITE_NEW_DXT1_TABLES
	static void create_etc1_to_dxt1_5_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_dxt1_5.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_DXT1_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_dxt1_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_dxt1_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 31; hi++)
						{
							for (uint32_t lo = 0; lo <= 31; lo++)
							{
								//if (lo == hi) continue;

								uint32_t colors[4];

								colors[0] = (lo << 3) | (lo >> 2);
								colors[3] = (hi << 3) | (hi >> 2);

								colors[1] = (colors[0] * 2 + colors[3]) / 3;
								colors[2] = (colors[3] * 2 + colors[0]) / 3;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_dxt1_selector_mappings[m][s]];

									total_err += err * err;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						assert(best_err <= 0xFFFF);

						//table[g + inten * 32].m_solutions[sr][m].m_lo = static_cast<uint8_t>(best_lo);
						//table[g + inten * 32].m_solutions[sr][m].m_hi = static_cast<uint8_t>(best_hi);
						//table[g + inten * 32].m_solutions[sr][m].m_err = static_cast<uint16_t>(best_err);

						//assert(best_lo != best_hi);
						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}

	static void create_etc1_to_dxt1_6_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_dxt1_6.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_DXT1_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_dxt1_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_dxt1_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 63; hi++)
						{
							for (uint32_t lo = 0; lo <= 63; lo++)
							{
								//if (lo == hi) continue;

								uint32_t colors[4];

								colors[0] = (lo << 2) | (lo >> 4);
								colors[3] = (hi << 2) | (hi >> 4);

								colors[1] = (colors[0] * 2 + colors[3]) / 3;
								colors[2] = (colors[3] * 2 + colors[0]) / 3;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_dxt1_selector_mappings[m][s]];

									total_err += err * err;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						assert(best_err <= 0xFFFF);

						//table[g + inten * 32].m_solutions[sr][m].m_lo = static_cast<uint8_t>(best_lo);
						//table[g + inten * 32].m_solutions[sr][m].m_hi = static_cast<uint8_t>(best_hi);
						//table[g + inten * 32].m_solutions[sr][m].m_err = static_cast<uint16_t>(best_err);

						//assert(best_lo != best_hi);
						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");

					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}
#endif


#if BASISD_SUPPORT_UASTC || BASISD_SUPPORT_ETC2_EAC_A8 || BASISD_SUPPORT_ETC2_EAC_RG11
	static const int8_t g_eac_modifier_table[16][8] =
	{
		{ -3, -6, -9, -15, 2, 5, 8, 14 },
		{ -3, -7, -10, -13, 2, 6, 9, 12 },
		{ -2, -5, -8, -13, 1, 4, 7, 12 },
		{ -2, -4, -6, -13, 1, 3, 5, 12 },
		{ -3, -6, -8, -12, 2, 5, 7, 11 },
		{ -3, -7, -9, -11, 2, 6, 8, 10 },
		{ -4, -7, -8, -11, 3, 6, 7, 10 },
		{ -3, -5, -8, -11, 2, 4, 7, 10 },

		{ -2, -6, -8, -10, 1, 5, 7, 9 },
		{ -2, -5, -8, -10, 1, 4, 7, 9 },
		{ -2, -4, -8, -10, 1, 3, 7, 9 },
		{ -2, -5, -7, -10, 1, 4, 6, 9 },
		{ -3, -4, -7, -10, 2, 3, 6, 9 },
		{ -1, -2, -3, -10, 0, 1, 2, 9 }, // entry 13
		{ -4, -6, -8, -9, 3, 5, 7, 8 },
		{ -3, -5, -7, -9, 2, 4, 6, 8 }
	};

	// Used by ETC2 EAC A8 and ETC2 EAC R11/RG11.
	struct eac_block
	{
		uint16_t m_base : 8;

		uint16_t m_table : 4;
		uint16_t m_multiplier : 4;

		uint8_t m_selectors[6];

		uint32_t get_selector(uint32_t x, uint32_t y) const
		{
			assert((x < 4) && (y < 4));

			const uint32_t ofs = 45 - (y + x * 4) * 3;

			const uint64_t pixels = get_selector_bits();

			return (pixels >> ofs) & 7;
		}

		void set_selector(uint32_t x, uint32_t y, uint32_t s)
		{
			assert((x < 4) && (y < 4) && (s < 8));

			const uint32_t ofs = 45 - (y + x * 4) * 3;

			uint64_t pixels = get_selector_bits();

			pixels &= ~(7ULL << ofs);
			pixels |= (static_cast<uint64_t>(s) << ofs);

			set_selector_bits(pixels);
		}

		uint64_t get_selector_bits() const
		{
			uint64_t pixels = ((uint64_t)m_selectors[0] << 40) | ((uint64_t)m_selectors[1] << 32) |
				((uint64_t)m_selectors[2] << 24) |
				((uint64_t)m_selectors[3] << 16) | ((uint64_t)m_selectors[4] << 8) | m_selectors[5];
			return pixels;
		}

		void set_selector_bits(uint64_t pixels)
		{
			m_selectors[0] = (uint8_t)(pixels >> 40);
			m_selectors[1] = (uint8_t)(pixels >> 32);
			m_selectors[2] = (uint8_t)(pixels >> 24);
			m_selectors[3] = (uint8_t)(pixels >> 16);
			m_selectors[4] = (uint8_t)(pixels >> 8);
			m_selectors[5] = (uint8_t)(pixels);
		}
	};

#endif // #if BASISD_SUPPORT_UASTC BASISD_SUPPORT_ETC2_EAC_A8 || BASISD_SUPPORT_ETC2_EAC_RG11

#if BASISD_SUPPORT_ETC2_EAC_A8 || BASISD_SUPPORT_ETC2_EAC_RG11
	static const dxt_selector_range s_etc2_eac_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },
	};

	const uint32_t NUM_ETC2_EAC_SELECTOR_RANGES = sizeof(s_etc2_eac_selector_ranges) / sizeof(s_etc2_eac_selector_ranges[0]);

	struct etc1_g_to_eac_conversion
	{
		uint8_t m_base;
		uint8_t m_table_mul; // mul*16+table
		uint16_t m_trans; // translates ETC1 selectors to ETC2_EAC_A8
	};
#endif // BASISD_SUPPORT_ETC2_EAC_A8 || BASISD_SUPPORT_ETC2_EAC_RG11

#if BASISD_SUPPORT_ETC2_EAC_A8

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
	struct pack_eac_a8_results
	{
		uint32_t m_base;
		uint32_t m_table;
		uint32_t m_multiplier;
		basisu::vector<uint8_t> m_selectors;
		basisu::vector<uint8_t> m_selectors_temp;
	};

	static uint64_t pack_eac_a8_exhaustive(pack_eac_a8_results& results, const uint8_t* pPixels, uint32_t num_pixels)
	{
		results.m_selectors.resize(num_pixels);
		results.m_selectors_temp.resize(num_pixels);

		uint64_t best_err = UINT64_MAX;

		for (uint32_t base_color = 0; base_color < 256; base_color++)
		{
			for (uint32_t multiplier = 1; multiplier < 16; multiplier++)
			{
				for (uint32_t table = 0; table < 16; table++)
				{
					uint64_t total_err = 0;

					for (uint32_t i = 0; i < num_pixels; i++)
					{
						const int a = pPixels[i];

						uint32_t best_s_err = UINT32_MAX;
						uint32_t best_s = 0;
						for (uint32_t s = 0; s < 8; s++)
						{
							int v = (int)multiplier * g_eac_modifier_table[table][s] + (int)base_color;
							if (v < 0)
								v = 0;
							else if (v > 255)
								v = 255;

							uint32_t err = abs(a - v);
							if (err < best_s_err)
							{
								best_s_err = err;
								best_s = s;
							}
						}

						results.m_selectors_temp[i] = static_cast<uint8_t>(best_s);

						total_err += best_s_err * best_s_err;
						if (total_err >= best_err)
							break;
					}

					if (total_err < best_err)
					{
						best_err = total_err;
						results.m_base = base_color;
						results.m_multiplier = multiplier;
						results.m_table = table;
						results.m_selectors.swap(results.m_selectors_temp);
					}

				} // table

			} // multiplier

		} // base_color

		return best_err;
	}
#endif // BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
		
	static
#if !BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES		
		const
#endif
		etc1_g_to_eac_conversion s_etc1_g_to_etc2_a8[32 * 8][NUM_ETC2_EAC_SELECTOR_RANGES] =
	{
		{ { 0,1,3328 },{ 0,1,3328 },{ 0,1,256 },{ 0,1,256 } },
		{ { 0,226,3936 },{ 0,226,3936 },{ 0,81,488 },{ 0,81,488 } },
		{ { 6,178,4012 },{ 6,178,4008 },{ 0,146,501 },{ 0,130,496 } },
		{ { 14,178,4012 },{ 14,178,4008 },{ 8,146,501 },{ 6,82,496 } },
		{ { 23,178,4012 },{ 23,178,4008 },{ 17,146,501 },{ 3,228,496 } },
		{ { 31,178,4012 },{ 31,178,4008 },{ 25,146,501 },{ 11,228,496 } },
		{ { 39,178,4012 },{ 39,178,4008 },{ 33,146,501 },{ 19,228,496 } },
		{ { 47,178,4012 },{ 47,178,4008 },{ 41,146,501 },{ 27,228,496 } },
		{ { 56,178,4012 },{ 56,178,4008 },{ 50,146,501 },{ 36,228,496 } },
		{ { 64,178,4012 },{ 64,178,4008 },{ 58,146,501 },{ 44,228,496 } },
		{ { 72,178,4012 },{ 72,178,4008 },{ 66,146,501 },{ 52,228,496 } },
		{ { 80,178,4012 },{ 80,178,4008 },{ 74,146,501 },{ 60,228,496 } },
		{ { 89,178,4012 },{ 89,178,4008 },{ 83,146,501 },{ 69,228,496 } },
		{ { 97,178,4012 },{ 97,178,4008 },{ 91,146,501 },{ 77,228,496 } },
		{ { 105,178,4012 },{ 105,178,4008 },{ 99,146,501 },{ 85,228,496 } },
		{ { 113,178,4012 },{ 113,178,4008 },{ 107,146,501 },{ 93,228,496 } },
		{ { 122,178,4012 },{ 122,178,4008 },{ 116,146,501 },{ 102,228,496 } },
		{ { 130,178,4012 },{ 130,178,4008 },{ 124,146,501 },{ 110,228,496 } },
		{ { 138,178,4012 },{ 138,178,4008 },{ 132,146,501 },{ 118,228,496 } },
		{ { 146,178,4012 },{ 146,178,4008 },{ 140,146,501 },{ 126,228,496 } },
		{ { 155,178,4012 },{ 155,178,4008 },{ 149,146,501 },{ 135,228,496 } },
		{ { 163,178,4012 },{ 163,178,4008 },{ 157,146,501 },{ 143,228,496 } },
		{ { 171,178,4012 },{ 171,178,4008 },{ 165,146,501 },{ 151,228,496 } },
		{ { 179,178,4012 },{ 179,178,4008 },{ 173,146,501 },{ 159,228,496 } },
		{ { 188,178,4012 },{ 188,178,4008 },{ 182,146,501 },{ 168,228,496 } },
		{ { 196,178,4012 },{ 196,178,4008 },{ 190,146,501 },{ 176,228,496 } },
		{ { 204,178,4012 },{ 204,178,4008 },{ 198,146,501 },{ 184,228,496 } },
		{ { 212,178,4012 },{ 212,178,4008 },{ 206,146,501 },{ 192,228,496 } },
		{ { 221,178,4012 },{ 221,178,4008 },{ 215,146,501 },{ 201,228,496 } },
		{ { 229,178,4012 },{ 229,178,4008 },{ 223,146,501 },{ 209,228,496 } },
		{ { 235,66,4012 },{ 221,100,4008 },{ 231,146,501 },{ 217,228,496 } },
		{ { 211,102,4085 },{ 118,31,4080 },{ 211,102,501 },{ 118,31,496 } },
		{ { 1,2,3328 },{ 1,2,3328 },{ 0,1,320 },{ 0,1,320 } },
		{ { 7,162,3905 },{ 7,162,3904 },{ 1,17,480 },{ 1,17,480 } },
		{ { 15,162,3906 },{ 15,162,3904 },{ 1,117,352 },{ 1,117,352 } },
		{ { 23,162,3906 },{ 23,162,3904 },{ 5,34,500 },{ 4,53,424 } },
		{ { 32,162,3906 },{ 32,162,3904 },{ 14,34,500 },{ 3,69,424 } },
		{ { 40,162,3906 },{ 40,162,3904 },{ 22,34,500 },{ 1,133,496 } },
		{ { 48,162,3906 },{ 48,162,3904 },{ 30,34,500 },{ 4,85,496 } },
		{ { 56,162,3906 },{ 56,162,3904 },{ 38,34,500 },{ 12,85,496 } },
		{ { 65,162,3906 },{ 65,162,3904 },{ 47,34,500 },{ 1,106,424 } },
		{ { 73,162,3906 },{ 73,162,3904 },{ 55,34,500 },{ 9,106,424 } },
		{ { 81,162,3906 },{ 81,162,3904 },{ 63,34,500 },{ 7,234,496 } },
		{ { 89,162,3906 },{ 89,162,3904 },{ 71,34,500 },{ 15,234,496 } },
		{ { 98,162,3906 },{ 98,162,3904 },{ 80,34,500 },{ 24,234,496 } },
		{ { 106,162,3906 },{ 106,162,3904 },{ 88,34,500 },{ 32,234,496 } },
		{ { 114,162,3906 },{ 114,162,3904 },{ 96,34,500 },{ 40,234,496 } },
		{ { 122,162,3906 },{ 122,162,3904 },{ 104,34,500 },{ 48,234,496 } },
		{ { 131,162,3906 },{ 131,162,3904 },{ 113,34,500 },{ 57,234,496 } },
		{ { 139,162,3906 },{ 139,162,3904 },{ 121,34,500 },{ 65,234,496 } },
		{ { 147,162,3906 },{ 147,162,3904 },{ 129,34,500 },{ 73,234,496 } },
		{ { 155,162,3906 },{ 155,162,3904 },{ 137,34,500 },{ 81,234,496 } },
		{ { 164,162,3906 },{ 164,162,3904 },{ 146,34,500 },{ 90,234,496 } },
		{ { 172,162,3906 },{ 172,162,3904 },{ 154,34,500 },{ 98,234,496 } },
		{ { 180,162,3906 },{ 180,162,3904 },{ 162,34,500 },{ 106,234,496 } },
		{ { 188,162,3906 },{ 188,162,3904 },{ 170,34,500 },{ 114,234,496 } },
		{ { 197,162,3906 },{ 197,162,3904 },{ 179,34,500 },{ 123,234,496 } },
		{ { 205,162,3906 },{ 205,162,3904 },{ 187,34,500 },{ 131,234,496 } },
		{ { 213,162,3906 },{ 213,162,3904 },{ 195,34,500 },{ 139,234,496 } },
		{ { 221,162,3906 },{ 221,162,3904 },{ 203,34,500 },{ 147,234,496 } },
		{ { 230,162,3906 },{ 230,162,3904 },{ 212,34,500 },{ 156,234,496 } },
		{ { 238,162,3906 },{ 174,106,4008 },{ 220,34,500 },{ 164,234,496 } },
		{ { 240,178,4001 },{ 182,106,4008 },{ 228,34,500 },{ 172,234,496 } },
		{ { 166,108,4085 },{ 115,31,4080 },{ 166,108,501 },{ 115,31,496 } },
		{ { 1,68,3328 },{ 1,68,3328 },{ 0,17,384 },{ 0,17,384 } },
		{ { 1,148,3904 },{ 1,148,3904 },{ 1,2,384 },{ 1,2,384 } },
		{ { 21,18,3851 },{ 21,18,3848 },{ 1,50,488 },{ 1,50,488 } },
		{ { 27,195,3851 },{ 29,18,3848 },{ 0,67,488 },{ 0,67,488 } },
		{ { 34,195,3907 },{ 38,18,3848 },{ 20,66,482 },{ 0,3,496 } },
		{ { 42,195,3907 },{ 46,18,3848 },{ 28,66,482 },{ 2,6,424 } },
		{ { 50,195,3907 },{ 54,18,3848 },{ 36,66,482 },{ 4,22,424 } },
		{ { 58,195,3907 },{ 62,18,3848 },{ 44,66,482 },{ 3,73,424 } },
		{ { 67,195,3907 },{ 71,18,3848 },{ 53,66,482 },{ 3,22,496 } },
		{ { 75,195,3907 },{ 79,18,3848 },{ 61,66,482 },{ 2,137,496 } },
		{ { 83,195,3907 },{ 87,18,3848 },{ 69,66,482 },{ 1,89,496 } },
		{ { 91,195,3907 },{ 95,18,3848 },{ 77,66,482 },{ 9,89,496 } },
		{ { 100,195,3907 },{ 104,18,3848 },{ 86,66,482 },{ 18,89,496 } },
		{ { 108,195,3907 },{ 112,18,3848 },{ 94,66,482 },{ 26,89,496 } },
		{ { 116,195,3907 },{ 120,18,3848 },{ 102,66,482 },{ 34,89,496 } },
		{ { 124,195,3907 },{ 128,18,3848 },{ 110,66,482 },{ 42,89,496 } },
		{ { 133,195,3907 },{ 137,18,3848 },{ 119,66,482 },{ 51,89,496 } },
		{ { 141,195,3907 },{ 145,18,3848 },{ 127,66,482 },{ 59,89,496 } },
		{ { 149,195,3907 },{ 153,18,3848 },{ 135,66,482 },{ 67,89,496 } },
		{ { 157,195,3907 },{ 161,18,3848 },{ 143,66,482 },{ 75,89,496 } },
		{ { 166,195,3907 },{ 170,18,3848 },{ 152,66,482 },{ 84,89,496 } },
		{ { 174,195,3907 },{ 178,18,3848 },{ 160,66,482 },{ 92,89,496 } },
		{ { 182,195,3907 },{ 186,18,3848 },{ 168,66,482 },{ 100,89,496 } },
		{ { 190,195,3907 },{ 194,18,3848 },{ 176,66,482 },{ 108,89,496 } },
		{ { 199,195,3907 },{ 203,18,3848 },{ 185,66,482 },{ 117,89,496 } },
		{ { 207,195,3907 },{ 211,18,3848 },{ 193,66,482 },{ 125,89,496 } },
		{ { 215,195,3907 },{ 219,18,3848 },{ 201,66,482 },{ 133,89,496 } },
		{ { 223,195,3907 },{ 227,18,3848 },{ 209,66,482 },{ 141,89,496 } },
		{ { 231,195,3907 },{ 168,89,4008 },{ 218,66,482 },{ 150,89,496 } },
		{ { 236,18,3907 },{ 176,89,4008 },{ 226,66,482 },{ 158,89,496 } },
		{ { 158,90,4085 },{ 103,31,4080 },{ 158,90,501 },{ 103,31,496 } },
		{ { 166,90,4085 },{ 111,31,4080 },{ 166,90,501 },{ 111,31,496 } },
		{ { 0,70,3328 },{ 0,70,3328 },{ 0,45,256 },{ 0,45,256 } },
		{ { 0,117,3904 },{ 0,117,3904 },{ 0,35,384 },{ 0,35,384 } },
		{ { 13,165,3905 },{ 13,165,3904 },{ 3,221,416 },{ 3,221,416 } },
		{ { 21,165,3906 },{ 21,165,3904 },{ 11,221,416 },{ 11,221,416 } },
		{ { 30,165,3906 },{ 30,165,3904 },{ 7,61,352 },{ 7,61,352 } },
		{ { 38,165,3906 },{ 38,165,3904 },{ 2,125,352 },{ 2,125,352 } },
		{ { 46,165,3906 },{ 46,165,3904 },{ 2,37,500 },{ 10,125,352 } },
		{ { 54,165,3906 },{ 54,165,3904 },{ 10,37,500 },{ 5,61,424 } },
		{ { 63,165,3906 },{ 63,165,3904 },{ 19,37,500 },{ 1,189,424 } },
		{ { 4,254,4012 },{ 71,165,3904 },{ 27,37,500 },{ 9,189,424 } },
		{ { 12,254,4012 },{ 79,165,3904 },{ 35,37,500 },{ 4,77,424 } },
		{ { 20,254,4012 },{ 87,165,3904 },{ 43,37,500 },{ 12,77,424 } },
		{ { 29,254,4012 },{ 96,165,3904 },{ 52,37,500 },{ 8,93,424 } },
		{ { 37,254,4012 },{ 104,165,3904 },{ 60,37,500 },{ 3,141,496 } },
		{ { 45,254,4012 },{ 112,165,3904 },{ 68,37,500 },{ 11,141,496 } },
		{ { 53,254,4012 },{ 120,165,3904 },{ 76,37,500 },{ 6,93,496 } },
		{ { 62,254,4012 },{ 129,165,3904 },{ 85,37,500 },{ 15,93,496 } },
		{ { 70,254,4012 },{ 137,165,3904 },{ 93,37,500 },{ 23,93,496 } },
		{ { 78,254,4012 },{ 145,165,3904 },{ 101,37,500 },{ 31,93,496 } },
		{ { 86,254,4012 },{ 153,165,3904 },{ 109,37,500 },{ 39,93,496 } },
		{ { 95,254,4012 },{ 162,165,3904 },{ 118,37,500 },{ 48,93,496 } },
		{ { 103,254,4012 },{ 170,165,3904 },{ 126,37,500 },{ 56,93,496 } },
		{ { 111,254,4012 },{ 178,165,3904 },{ 134,37,500 },{ 64,93,496 } },
		{ { 119,254,4012 },{ 186,165,3904 },{ 142,37,500 },{ 72,93,496 } },
		{ { 128,254,4012 },{ 195,165,3904 },{ 151,37,500 },{ 81,93,496 } },
		{ { 136,254,4012 },{ 203,165,3904 },{ 159,37,500 },{ 89,93,496 } },
		{ { 212,165,3906 },{ 136,77,4008 },{ 167,37,500 },{ 97,93,496 } },
		{ { 220,165,3394 },{ 131,93,4008 },{ 175,37,500 },{ 105,93,496 } },
		{ { 214,181,4001 },{ 140,93,4008 },{ 184,37,500 },{ 114,93,496 } },
		{ { 222,181,4001 },{ 148,93,4008 },{ 192,37,500 },{ 122,93,496 } },
		{ { 114,95,4085 },{ 99,31,4080 },{ 114,95,501 },{ 99,31,496 } },
		{ { 122,95,4085 },{ 107,31,4080 },{ 122,95,501 },{ 107,31,496 } },
		{ { 0,102,3840 },{ 0,102,3840 },{ 0,18,384 },{ 0,18,384 } },
		{ { 5,167,3904 },{ 5,167,3904 },{ 0,13,256 },{ 0,13,256 } },
		{ { 4,54,3968 },{ 4,54,3968 },{ 1,67,448 },{ 1,67,448 } },
		{ { 30,198,3850 },{ 30,198,3848 },{ 0,3,480 },{ 0,3,480 } },
		{ { 39,198,3850 },{ 39,198,3848 },{ 3,52,488 },{ 3,52,488 } },
		{ { 47,198,3851 },{ 47,198,3848 },{ 3,4,488 },{ 3,4,488 } },
		{ { 55,198,3851 },{ 55,198,3848 },{ 1,70,488 },{ 1,70,488 } },
		{ { 54,167,3906 },{ 63,198,3848 },{ 3,22,488 },{ 3,22,488 } },
		{ { 62,167,3906 },{ 72,198,3848 },{ 24,118,488 },{ 0,6,496 } },
		{ { 70,167,3906 },{ 80,198,3848 },{ 32,118,488 },{ 2,89,488 } },
		{ { 78,167,3906 },{ 88,198,3848 },{ 40,118,488 },{ 1,73,496 } },
		{ { 86,167,3906 },{ 96,198,3848 },{ 48,118,488 },{ 0,28,424 } },
		{ { 95,167,3906 },{ 105,198,3848 },{ 57,118,488 },{ 9,28,424 } },
		{ { 103,167,3906 },{ 113,198,3848 },{ 65,118,488 },{ 5,108,496 } },
		{ { 111,167,3906 },{ 121,198,3848 },{ 73,118,488 },{ 13,108,496 } },
		{ { 119,167,3906 },{ 129,198,3848 },{ 81,118,488 },{ 21,108,496 } },
		{ { 128,167,3906 },{ 138,198,3848 },{ 90,118,488 },{ 6,28,496 } },
		{ { 136,167,3906 },{ 146,198,3848 },{ 98,118,488 },{ 14,28,496 } },
		{ { 144,167,3906 },{ 154,198,3848 },{ 106,118,488 },{ 22,28,496 } },
		{ { 152,167,3906 },{ 162,198,3848 },{ 114,118,488 },{ 30,28,496 } },
		{ { 161,167,3906 },{ 171,198,3848 },{ 123,118,488 },{ 39,28,496 } },
		{ { 169,167,3906 },{ 179,198,3848 },{ 131,118,488 },{ 47,28,496 } },
		{ { 177,167,3906 },{ 187,198,3848 },{ 139,118,488 },{ 55,28,496 } },
		{ { 185,167,3906 },{ 195,198,3848 },{ 147,118,488 },{ 63,28,496 } },
		{ { 194,167,3906 },{ 120,12,4008 },{ 156,118,488 },{ 72,28,496 } },
		{ { 206,198,3907 },{ 116,28,4008 },{ 164,118,488 },{ 80,28,496 } },
		{ { 214,198,3907 },{ 124,28,4008 },{ 172,118,488 },{ 88,28,496 } },
		{ { 222,198,3395 },{ 132,28,4008 },{ 180,118,488 },{ 96,28,496 } },
		{ { 207,134,4001 },{ 141,28,4008 },{ 189,118,488 },{ 105,28,496 } },
		{ { 95,30,4085 },{ 86,31,4080 },{ 95,30,501 },{ 86,31,496 } },
		{ { 103,30,4085 },{ 94,31,4080 },{ 103,30,501 },{ 94,31,496 } },
		{ { 111,30,4085 },{ 102,31,4080 },{ 111,30,501 },{ 102,31,496 } },
		{ { 0,104,3840 },{ 0,104,3840 },{ 0,18,448 },{ 0,18,448 } },
		{ { 4,39,3904 },{ 4,39,3904 },{ 0,4,384 },{ 0,4,384 } },
		{ { 0,56,3968 },{ 0,56,3968 },{ 0,84,448 },{ 0,84,448 } },
		{ { 6,110,3328 },{ 6,110,3328 },{ 0,20,448 },{ 0,20,448 } },
		{ { 41,200,3850 },{ 41,200,3848 },{ 1,4,480 },{ 1,4,480 } },
		{ { 49,200,3850 },{ 49,200,3848 },{ 1,8,416 },{ 1,8,416 } },
		{ { 57,200,3851 },{ 57,200,3848 },{ 1,38,488 },{ 1,38,488 } },
		{ { 65,200,3851 },{ 65,200,3848 },{ 1,120,488 },{ 1,120,488 } },
		{ { 74,200,3851 },{ 74,200,3848 },{ 2,72,488 },{ 2,72,488 } },
		{ { 69,6,3907 },{ 82,200,3848 },{ 2,24,488 },{ 2,24,488 } },
		{ { 77,6,3907 },{ 90,200,3848 },{ 26,120,488 },{ 10,24,488 } },
		{ { 97,63,3330 },{ 98,200,3848 },{ 34,120,488 },{ 2,8,496 } },
		{ { 106,63,3330 },{ 107,200,3848 },{ 43,120,488 },{ 3,92,488 } },
		{ { 114,63,3330 },{ 115,200,3848 },{ 51,120,488 },{ 11,92,488 } },
		{ { 122,63,3330 },{ 123,200,3848 },{ 59,120,488 },{ 7,76,496 } },
		{ { 130,63,3330 },{ 131,200,3848 },{ 67,120,488 },{ 15,76,496 } },
		{ { 139,63,3330 },{ 140,200,3848 },{ 76,120,488 },{ 24,76,496 } },
		{ { 147,63,3330 },{ 148,200,3848 },{ 84,120,488 },{ 32,76,496 } },
		{ { 155,63,3330 },{ 156,200,3848 },{ 92,120,488 },{ 40,76,496 } },
		{ { 163,63,3330 },{ 164,200,3848 },{ 100,120,488 },{ 48,76,496 } },
		{ { 172,63,3330 },{ 173,200,3848 },{ 109,120,488 },{ 57,76,496 } },
		{ { 184,6,3851 },{ 181,200,3848 },{ 117,120,488 },{ 65,76,496 } },
		{ { 192,6,3851 },{ 133,28,3936 },{ 125,120,488 },{ 73,76,496 } },
		{ { 189,200,3907 },{ 141,28,3936 },{ 133,120,488 },{ 81,76,496 } },
		{ { 198,200,3907 },{ 138,108,4000 },{ 142,120,488 },{ 90,76,496 } },
		{ { 206,200,3907 },{ 146,108,4000 },{ 150,120,488 },{ 98,76,496 } },
		{ { 214,200,3395 },{ 154,108,4000 },{ 158,120,488 },{ 106,76,496 } },
		{ { 190,136,4001 },{ 162,108,4000 },{ 166,120,488 },{ 114,76,496 } },
		{ { 123,30,4076 },{ 87,15,4080 },{ 123,30,492 },{ 87,15,496 } },
		{ { 117,110,4084 },{ 80,31,4080 },{ 117,110,500 },{ 80,31,496 } },
		{ { 125,110,4084 },{ 88,31,4080 },{ 125,110,500 },{ 88,31,496 } },
		{ { 133,110,4084 },{ 96,31,4080 },{ 133,110,500 },{ 96,31,496 } },
		{ { 9,56,3904 },{ 9,56,3904 },{ 0,67,448 },{ 0,67,448 } },
		{ { 1,8,3904 },{ 1,8,3904 },{ 1,84,448 },{ 1,84,448 } },
		{ { 1,124,3904 },{ 1,124,3904 },{ 0,39,384 },{ 0,39,384 } },
		{ { 9,124,3904 },{ 9,124,3904 },{ 1,4,448 },{ 1,4,448 } },
		{ { 6,76,3904 },{ 6,76,3904 },{ 0,70,448 },{ 0,70,448 } },
		{ { 62,6,3859 },{ 62,6,3856 },{ 2,38,480 },{ 2,38,480 } },
		{ { 70,6,3859 },{ 70,6,3856 },{ 5,43,416 },{ 5,43,416 } },
		{ { 78,6,3859 },{ 78,6,3856 },{ 2,11,416 },{ 2,11,416 } },
		{ { 87,6,3859 },{ 87,6,3856 },{ 0,171,488 },{ 0,171,488 } },
		{ { 67,8,3906 },{ 95,6,3856 },{ 8,171,488 },{ 8,171,488 } },
		{ { 75,8,3907 },{ 103,6,3856 },{ 5,123,488 },{ 5,123,488 } },
		{ { 83,8,3907 },{ 111,6,3856 },{ 2,75,488 },{ 2,75,488 } },
		{ { 92,8,3907 },{ 120,6,3856 },{ 0,27,488 },{ 0,27,488 } },
		{ { 100,8,3907 },{ 128,6,3856 },{ 8,27,488 },{ 8,27,488 } },
		{ { 120,106,3843 },{ 136,6,3856 },{ 100,6,387 },{ 16,27,488 } },
		{ { 128,106,3843 },{ 144,6,3856 },{ 108,6,387 },{ 2,11,496 } },
		{ { 137,106,3843 },{ 153,6,3856 },{ 117,6,387 },{ 11,11,496 } },
		{ { 145,106,3843 },{ 161,6,3856 },{ 125,6,387 },{ 19,11,496 } },
		{ { 163,8,3851 },{ 137,43,3904 },{ 133,6,387 },{ 27,11,496 } },
		{ { 171,8,3851 },{ 101,11,4000 },{ 141,6,387 },{ 35,11,496 } },
		{ { 180,8,3851 },{ 110,11,4000 },{ 150,6,387 },{ 44,11,496 } },
		{ { 188,8,3851 },{ 118,11,4000 },{ 158,6,387 },{ 52,11,496 } },
		{ { 172,72,3907 },{ 126,11,4000 },{ 166,6,387 },{ 60,11,496 } },
		{ { 174,6,3971 },{ 134,11,4000 },{ 174,6,387 },{ 68,11,496 } },
		{ { 183,6,3971 },{ 143,11,4000 },{ 183,6,387 },{ 77,11,496 } },
		{ { 191,6,3971 },{ 151,11,4000 },{ 191,6,387 },{ 85,11,496 } },
		{ { 199,6,3971 },{ 159,11,4000 },{ 199,6,387 },{ 93,11,496 } },
		{ { 92,12,4084 },{ 69,15,4080 },{ 92,12,500 },{ 69,15,496 } },
		{ { 101,12,4084 },{ 78,15,4080 },{ 101,12,500 },{ 78,15,496 } },
		{ { 109,12,4084 },{ 86,15,4080 },{ 109,12,500 },{ 86,15,496 } },
		{ { 117,12,4084 },{ 79,31,4080 },{ 117,12,500 },{ 79,31,496 } },
		{ { 125,12,4084 },{ 87,31,4080 },{ 125,12,500 },{ 87,31,496 } },
		{ { 71,8,3602 },{ 71,8,3600 },{ 2,21,384 },{ 2,21,384 } },
		{ { 79,8,3611 },{ 79,8,3608 },{ 0,69,448 },{ 0,69,448 } },
		{ { 87,8,3611 },{ 87,8,3608 },{ 0,23,384 },{ 0,23,384 } },
		{ { 95,8,3611 },{ 95,8,3608 },{ 1,5,448 },{ 1,5,448 } },
		{ { 104,8,3611 },{ 104,8,3608 },{ 0,88,448 },{ 0,88,448 } },
		{ { 112,8,3611 },{ 112,8,3608 },{ 0,72,448 },{ 0,72,448 } },
		{ { 120,8,3611 },{ 121,8,3608 },{ 36,21,458 },{ 36,21,456 } },
		{ { 133,47,3091 },{ 129,8,3608 },{ 44,21,458 },{ 44,21,456 } },
		{ { 142,47,3091 },{ 138,8,3608 },{ 53,21,459 },{ 53,21,456 } },
		{ { 98,12,3850 },{ 98,12,3848 },{ 61,21,459 },{ 61,21,456 } },
		{ { 106,12,3850 },{ 106,12,3848 },{ 10,92,480 },{ 69,21,456 } },
		{ { 114,12,3851 },{ 114,12,3848 },{ 18,92,480 },{ 77,21,456 } },
		{ { 87,12,3906 },{ 87,12,3904 },{ 3,44,488 },{ 86,21,456 } },
		{ { 95,12,3906 },{ 95,12,3904 },{ 11,44,488 },{ 94,21,456 } },
		{ { 103,12,3906 },{ 103,12,3904 },{ 19,44,488 },{ 102,21,456 } },
		{ { 111,12,3907 },{ 111,12,3904 },{ 27,44,489 },{ 110,21,456 } },
		{ { 120,12,3907 },{ 120,12,3904 },{ 36,44,489 },{ 119,21,456 } },
		{ { 128,12,3907 },{ 128,12,3904 },{ 44,44,489 },{ 127,21,456 } },
		{ { 136,12,3907 },{ 136,12,3904 },{ 52,44,489 },{ 135,21,456 } },
		{ { 144,12,3907 },{ 144,12,3904 },{ 60,44,489 },{ 143,21,456 } },
		{ { 153,12,3907 },{ 153,12,3904 },{ 69,44,490 },{ 152,21,456 } },
		{ { 161,12,3395 },{ 149,188,3968 },{ 77,44,490 },{ 160,21,456 } },
		{ { 169,12,3395 },{ 198,21,3928 },{ 85,44,490 },{ 168,21,456 } },
		{ { 113,95,4001 },{ 201,69,3992 },{ 125,8,483 },{ 176,21,456 } },
		{ { 122,95,4001 },{ 200,21,3984 },{ 134,8,483 },{ 185,21,456 } },
		{ { 142,8,4067 },{ 208,21,3984 },{ 142,8,483 },{ 193,21,456 } },
		{ { 151,8,4067 },{ 47,15,4080 },{ 151,8,483 },{ 47,15,496 } },
		{ { 159,8,4067 },{ 55,15,4080 },{ 159,8,483 },{ 55,15,496 } },
		{ { 168,8,4067 },{ 64,15,4080 },{ 168,8,483 },{ 64,15,496 } },
		{ { 160,40,4075 },{ 72,15,4080 },{ 160,40,491 },{ 72,15,496 } },
		{ { 168,40,4075 },{ 80,15,4080 },{ 168,40,491 },{ 80,15,496 } },
		{ { 144,8,4082 },{ 88,15,4080 },{ 144,8,498 },{ 88,15,496 } }
	};
#endif // BASISD_SUPPORT_ETC2_EAC_A8

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
	static void create_etc2_eac_a8_conversion_table()
	{
		FILE* pFile = fopen("basisu_decoder_tables_etc2_eac_a8.inc", "w");

		for (uint32_t inten = 0; inten < 8; inten++)
		{
			for (uint32_t base = 0; base < 32; base++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(base, base, base, 255), false), inten);

				fprintf(pFile, "{");

				for (uint32_t sel_range = 0; sel_range < NUM_ETC2_EAC_SELECTOR_RANGES; sel_range++)
				{
					const uint32_t low_selector = s_etc2_eac_selector_ranges[sel_range].m_low;
					const uint32_t high_selector = s_etc2_eac_selector_ranges[sel_range].m_high;

					// We have a ETC1 base color and intensity, and a used selector range from low_selector-high_selector.
					// Now find the best ETC2 EAC A8 base/table/multiplier that fits these colors.

					uint8_t pixels[4];
					uint32_t num_pixels = 0;
					for (uint32_t s = low_selector; s <= high_selector; s++)
						pixels[num_pixels++] = block_colors[s].g;

					pack_eac_a8_results pack_results;
					pack_eac_a8_exhaustive(pack_results, pixels, num_pixels);

					etc1_g_to_eac_conversion& c = s_etc1_g_to_etc2_a8[base + inten * 32][sel_range];

					c.m_base = pack_results.m_base;
					c.m_table_mul = pack_results.m_table * 16 + pack_results.m_multiplier;
					c.m_trans = 0;

					for (uint32_t s = 0; s < 4; s++)
					{
						if ((s < low_selector) || (s > high_selector))
							continue;

						uint32_t etc2_selector = pack_results.m_selectors[s - low_selector];

						c.m_trans |= (etc2_selector << (s * 3));
					}

					fprintf(pFile, "{%u,%u,%u}", c.m_base, c.m_table_mul, c.m_trans);
					if (sel_range < (NUM_ETC2_EAC_SELECTOR_RANGES - 1))
						fprintf(pFile, ",");
				}

				fprintf(pFile, "},\n");
			}
		}

		fclose(pFile);
	}
#endif

#if BASISD_WRITE_NEW_ETC2_EAC_R11_TABLES
	struct pack_eac_r11_results
	{
		uint32_t m_base;
		uint32_t m_table;
		uint32_t m_multiplier;
		basisu::vector<uint8_t> m_selectors;
		basisu::vector<uint8_t> m_selectors_temp;
	};

	static uint64_t pack_eac_r11_exhaustive(pack_eac_r11_results& results, const uint8_t* pPixels, uint32_t num_pixels)
	{
		results.m_selectors.resize(num_pixels);
		results.m_selectors_temp.resize(num_pixels);

		uint64_t best_err = UINT64_MAX;

		for (uint32_t base_color = 0; base_color < 256; base_color++)
		{
			for (uint32_t multiplier = 0; multiplier < 16; multiplier++)
			{
				for (uint32_t table = 0; table < 16; table++)
				{
					uint64_t total_err = 0;

					for (uint32_t i = 0; i < num_pixels; i++)
					{
						// Convert 8-bit input to 11-bits
						const int a = (pPixels[i] * 2047 + 128) / 255;

						uint32_t best_s_err = UINT32_MAX;
						uint32_t best_s = 0;
						for (uint32_t s = 0; s < 8; s++)
						{
							int v = (int)(multiplier ? (multiplier * 8) : 1) * g_eac_modifier_table[table][s] + (int)base_color * 8 + 4;
							if (v < 0)
								v = 0;
							else if (v > 2047)
								v = 2047;

							uint32_t err = abs(a - v);
							if (err < best_s_err)
							{
								best_s_err = err;
								best_s = s;
							}
						}

						results.m_selectors_temp[i] = static_cast<uint8_t>(best_s);

						total_err += best_s_err * best_s_err;
						if (total_err >= best_err)
							break;
					}

					if (total_err < best_err)
					{
						best_err = total_err;
						results.m_base = base_color;
						results.m_multiplier = multiplier;
						results.m_table = table;
						results.m_selectors.swap(results.m_selectors_temp);
					}

				} // table

			} // multiplier

		} // base_color

		return best_err;
	}

	static void create_etc2_eac_r11_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_decoder_tables_etc2_eac_r11.inc", "w");

		for (uint32_t inten = 0; inten < 8; inten++)
		{
			for (uint32_t base = 0; base < 32; base++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(base, base, base, 255), false), inten);

				fprintf(pFile, "{");

				for (uint32_t sel_range = 0; sel_range < NUM_ETC2_EAC_SELECTOR_RANGES; sel_range++)
				{
					const uint32_t low_selector = s_etc2_eac_selector_ranges[sel_range].m_low;
					const uint32_t high_selector = s_etc2_eac_selector_ranges[sel_range].m_high;

					// We have a ETC1 base color and intensity, and a used selector range from low_selector-high_selector.
					// Now find the best ETC2 EAC R11 base/table/multiplier that fits these colors.

					uint8_t pixels[4];
					uint32_t num_pixels = 0;
					for (uint32_t s = low_selector; s <= high_selector; s++)
						pixels[num_pixels++] = block_colors[s].g;

					pack_eac_r11_results pack_results;
					pack_eac_r11_exhaustive(pack_results, pixels, num_pixels);

					etc1_g_to_eac_conversion c;

					c.m_base = (uint8_t)pack_results.m_base;
					c.m_table_mul = (uint8_t)(pack_results.m_table * 16 + pack_results.m_multiplier);
					c.m_trans = 0;

					for (uint32_t s = 0; s < 4; s++)
					{
						if ((s < low_selector) || (s > high_selector))
							continue;

						uint32_t etc2_selector = pack_results.m_selectors[s - low_selector];

						c.m_trans |= (etc2_selector << (s * 3));
					}

					fprintf(pFile, "{%u,%u,%u}", c.m_base, c.m_table_mul, c.m_trans);
					if (sel_range < (NUM_ETC2_EAC_SELECTOR_RANGES - 1))
						fprintf(pFile, ",");
				}

				fprintf(pFile, "},\n");
			}
		}

		fclose(pFile);
	}
#endif // BASISD_WRITE_NEW_ETC2_EAC_R11_TABLES

#if BASISD_WRITE_NEW_ASTC_TABLES
	static void create_etc1_to_astc_conversion_table_0_47();
	static void create_etc1_to_astc_conversion_table_0_255();
#endif

#if BASISD_SUPPORT_ASTC
	static void transcoder_init_astc();
#endif

#if BASISD_WRITE_NEW_BC7_MODE5_TABLES
	static void create_etc1_to_bc7_m5_color_conversion_table();
	static void create_etc1_to_bc7_m5_alpha_conversion_table();
#endif

#if BASISD_SUPPORT_BC7_MODE5
	static void transcoder_init_bc7_mode5();
#endif

#if BASISD_WRITE_NEW_ATC_TABLES
	static void create_etc1s_to_atc_conversion_tables();
#endif

#if BASISD_SUPPORT_ATC
	static void transcoder_init_atc();
#endif

#if BASISD_SUPPORT_PVRTC2
	static void transcoder_init_pvrtc2();
#endif

#if BASISD_SUPPORT_UASTC
	void uastc_init();
#endif

	static bool g_transcoder_initialized;
		
	// Library global initialization. Requires ~9 milliseconds when compiled and executed natively on a Core i7 2.2 GHz.
	// If this is too slow, these computed tables can easilky be moved to be compiled in.
	void basisu_transcoder_init()
	{
		if (g_transcoder_initialized)
      {
         BASISU_DEVEL_ERROR("basisu_transcoder::basisu_transcoder_init: Called more than once\n");      
			return;
      }
         
     BASISU_DEVEL_ERROR("basisu_transcoder::basisu_transcoder_init: Initializing (this is not an error)\n");      

#if BASISD_SUPPORT_UASTC
		uastc_init();
#endif

#if BASISD_SUPPORT_ASTC
		transcoder_init_astc();
#endif
				
#if BASISD_WRITE_NEW_ASTC_TABLES
		create_etc1_to_astc_conversion_table_0_47();
		create_etc1_to_astc_conversion_table_0_255();
		exit(0);
#endif

#if BASISD_WRITE_NEW_BC7_MODE5_TABLES
		create_etc1_to_bc7_m5_color_conversion_table();
		create_etc1_to_bc7_m5_alpha_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_DXT1_TABLES
		create_etc1_to_dxt1_5_conversion_table();
		create_etc1_to_dxt1_6_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
		create_etc2_eac_a8_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_ATC_TABLES
		create_etc1s_to_atc_conversion_tables();
		exit(0);
#endif

#if BASISD_WRITE_NEW_ETC2_EAC_R11_TABLES
		create_etc2_eac_r11_conversion_table();
		exit(0);
#endif

#if BASISD_SUPPORT_DXT1 || BASISD_SUPPORT_UASTC
		uint8_t bc1_expand5[32];
		for (int i = 0; i < 32; i++)
			bc1_expand5[i] = static_cast<uint8_t>((i << 3) | (i >> 2));
		prepare_bc1_single_color_table(g_bc1_match5_equals_1, bc1_expand5, 32, 32, 1);
		prepare_bc1_single_color_table(g_bc1_match5_equals_0, bc1_expand5, 1, 32, 0);

		uint8_t bc1_expand6[64];
		for (int i = 0; i < 64; i++)
			bc1_expand6[i] = static_cast<uint8_t>((i << 2) | (i >> 4));
		prepare_bc1_single_color_table(g_bc1_match6_equals_1, bc1_expand6, 64, 64, 1);
		prepare_bc1_single_color_table(g_bc1_match6_equals_0, bc1_expand6, 1, 64, 0);