godot/thirdparty/basis_universal/basisu_astc_decomp.cpp

// basisu_astc_decomp.cpp: Only used for ASTC decompression, to validate the transcoder's output.
// This version does not support HDR.

/*-------------------------------------------------------------------------
 * drawElements Quality Program Tester Core
 * ----------------------------------------
 *
 * Copyright 2016 The Android Open Source Project
 *
 * 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.
 *
 * rg: Removed external dependencies, remarked out HDR support because
 * we don't need it, minor fix to decompress() so it converts non-sRGB
 * output to 8-bits correctly. I've compared this decoder's output
 * vs. astc-codec with random inputs on 4x4 blocks, and after fixing a few obvious
 * bugs in astc-codec where it didn't correctly follow the spec they match so 
 * I'm assuming they are both correct for 4x4 now.
 * HDR support should be easily added back in, but as we don't need it 
 * I'm leaving this for someone else.
 * 
 *//*!
 * \file
 * \brief ASTC Utilities.
 *//*--------------------------------------------------------------------*/
#include "basisu_astc_decomp.h"
#include <assert.h>
#include <algorithm>

#define DE_LENGTH_OF_ARRAY(x) (sizeof(x)/sizeof(x[0]))
#define DE_UNREF(x) (void)x

typedef uint8_t deUint8;
typedef int8_t deInt8;
typedef uint32_t deUint32;
typedef int32_t deInt32;
typedef uint16_t deUint16;
typedef int16_t deInt16;
typedef int64_t deInt64;
typedef uint64_t deUint64;

#define DE_ASSERT assert

namespace basisu_astc
{
	static bool inBounds(int v, int l, int h)
	{
		return (v >= l) && (v < h);
	}

	static bool inRange(int v, int l, int h)
	{
		return (v >= l) && (v <= h);
	}

	template<typename T>
	static inline T max(T a, T b)
	{
		return (a > b) ? a : b;
	}

	template<typename T>
	static inline T min(T a, T b)
	{
		return (a < b) ? a : b;
	}

	template<typename T>
	static inline T clamp(T a, T l, T h)
	{
		if (a < l)
			return l;
		else if (a > h)
			return h;
		return a;
	}

	struct UVec4
	{
		uint32_t m_c[4];

		UVec4()
		{
			m_c[0] = 0;
			m_c[1] = 0;
			m_c[2] = 0;
			m_c[3] = 0;
		}

		UVec4(uint32_t x, uint32_t y, uint32_t z, uint32_t w)
		{
			m_c[0] = x;
			m_c[1] = y;
			m_c[2] = z;
			m_c[3] = w;
		}

		uint32_t x() const { return m_c[0]; }
		uint32_t y() const { return m_c[1]; }
		uint32_t z() const { return m_c[2]; }
		uint32_t w() const { return m_c[3]; }

		uint32_t& x() { return m_c[0]; }
		uint32_t& y() { return m_c[1]; }
		uint32_t& z() { return m_c[2]; }
		uint32_t& w() { return m_c[3]; }

		uint32_t operator[] (uint32_t idx) const { assert(idx < 4);  return m_c[idx]; }
		uint32_t& operator[] (uint32_t idx) { assert(idx < 4);  return m_c[idx]; }
	};

	struct IVec4
	{
		int32_t m_c[4];

		IVec4()
		{
			m_c[0] = 0;
			m_c[1] = 0;
			m_c[2] = 0;
			m_c[3] = 0;
		}

		IVec4(int32_t x, int32_t y, int32_t z, int32_t w)
		{
			m_c[0] = x;
			m_c[1] = y;
			m_c[2] = z;
			m_c[3] = w;
		}

		int32_t x() const { return m_c[0]; }
		int32_t y() const { return m_c[1]; }
		int32_t z() const { return m_c[2]; }
		int32_t w() const { return m_c[3]; }

		int32_t& x() { return m_c[0]; }
		int32_t& y() { return m_c[1]; }
		int32_t& z() { return m_c[2]; }
		int32_t& w() { return m_c[3]; }

		UVec4 asUint() const
		{
			return UVec4(std::max(0, m_c[0]), std::max(0, m_c[1]), std::max(0, m_c[2]), std::max(0, m_c[3]));
		}

		int32_t operator[] (uint32_t idx) const { assert(idx < 4);  return m_c[idx]; }
		int32_t& operator[] (uint32_t idx) { assert(idx < 4);  return m_c[idx]; }
	};

	struct IVec3
	{
		int32_t m_c[3];

		IVec3()
		{
			m_c[0] = 0;
			m_c[1] = 0;
			m_c[2] = 0;
		}

		IVec3(int32_t x, int32_t y, int32_t z)
		{
			m_c[0] = x;
			m_c[1] = y;
			m_c[2] = z;
		}

		int32_t x() const { return m_c[0]; }
		int32_t y() const { return m_c[1]; }
		int32_t z() const { return m_c[2]; }

		int32_t& x() { return m_c[0]; }
		int32_t& y() { return m_c[1]; }
		int32_t& z() { return m_c[2]; }

		int32_t operator[] (uint32_t idx) const { assert(idx < 3);  return m_c[idx]; }
		int32_t& operator[] (uint32_t idx) { assert(idx < 3);  return m_c[idx]; }
	};

	static uint32_t deDivRoundUp32(uint32_t a, uint32_t b)
	{
		return (a + b - 1) / b;
	}

	static bool deInBounds32(uint32_t v, uint32_t l, uint32_t h)
	{
		return (v >= l) && (v < h);
	}

namespace astc
{
using std::vector;
namespace
{
// Common utilities
enum
{
	MAX_BLOCK_WIDTH		= 12,
	MAX_BLOCK_HEIGHT	= 12
};
inline deUint32 getBit (deUint32 src, int ndx)
{
	DE_ASSERT(basisu_astc::inBounds(ndx, 0, 32));
	return (src >> ndx) & 1;
}
inline deUint32 getBits (deUint32 src, int low, int high)
{
	const int numBits = (high-low) + 1;
	DE_ASSERT(basisu_astc::inRange(numBits, 1, 32));
	if (numBits < 32)
		return (deUint32)((src >> low) & ((1u<<numBits)-1));
	else
		return (deUint32)((src >> low) & 0xFFFFFFFFu);
}
inline bool isBitSet (deUint32 src, int ndx)
{
	return getBit(src, ndx) != 0;
}
inline deUint32 reverseBits (deUint32 src, int numBits)
{
	DE_ASSERT(basisu_astc::inRange(numBits, 0, 32));
	deUint32 result = 0;
	for (int i = 0; i < numBits; i++)
		result |= ((src >> i) & 1) << (numBits-1-i);
	return result;
}
inline deUint32 bitReplicationScale (deUint32 src, int numSrcBits, int numDstBits)
{
	DE_ASSERT(numSrcBits <= numDstBits);
	DE_ASSERT((src & ((1<<numSrcBits)-1)) == src);
	deUint32 dst = 0;
	for (int shift = numDstBits-numSrcBits; shift > -numSrcBits; shift -= numSrcBits)
		dst |= shift >= 0 ? src << shift : src >> -shift;
	return dst;
}

inline deInt32 signExtend (deInt32 src, int numSrcBits)
{
	DE_ASSERT(basisu_astc::inRange(numSrcBits, 2, 31));
	const bool negative = (src & (1 << (numSrcBits-1))) != 0;
	return src | (negative ? ~((1 << numSrcBits) - 1) : 0);
}

//inline bool isFloat16InfOrNan (deFloat16 v)
//{
//	return getBits(v, 10, 14) == 31;
//}

enum ISEMode
{
	ISEMODE_TRIT = 0,
	ISEMODE_QUINT,
	ISEMODE_PLAIN_BIT,
	ISEMODE_LAST
};
struct ISEParams
{
	ISEMode		mode;
	int			numBits;
	ISEParams (ISEMode mode_, int numBits_) : mode(mode_), numBits(numBits_) {}
};
inline int computeNumRequiredBits (const ISEParams& iseParams, int numValues)
{
	switch (iseParams.mode)
	{
		case ISEMODE_TRIT:			return deDivRoundUp32(numValues*8, 5) + numValues*iseParams.numBits;
		case ISEMODE_QUINT:			return deDivRoundUp32(numValues*7, 3) + numValues*iseParams.numBits;
		case ISEMODE_PLAIN_BIT:		return numValues*iseParams.numBits;
		default:
			DE_ASSERT(false);
			return -1;
	}
}
ISEParams computeMaximumRangeISEParams (int numAvailableBits, int numValuesInSequence)
{
	int curBitsForTritMode		= 6;
	int curBitsForQuintMode		= 5;
	int curBitsForPlainBitMode	= 8;
	while (true)
	{
		DE_ASSERT(curBitsForTritMode > 0 || curBitsForQuintMode > 0 || curBitsForPlainBitMode > 0);
		const int tritRange			= curBitsForTritMode > 0		? (3 << curBitsForTritMode) - 1			: -1;
		const int quintRange		= curBitsForQuintMode > 0		? (5 << curBitsForQuintMode) - 1		: -1;
		const int plainBitRange		= curBitsForPlainBitMode > 0	? (1 << curBitsForPlainBitMode) - 1		: -1;
		const int maxRange			= basisu_astc::max(basisu_astc::max(tritRange, quintRange), plainBitRange);
		if (maxRange == tritRange)
		{
			const ISEParams params(ISEMODE_TRIT, curBitsForTritMode);
			if (computeNumRequiredBits(params, numValuesInSequence) <= numAvailableBits)
				return ISEParams(ISEMODE_TRIT, curBitsForTritMode);
			curBitsForTritMode--;
		}
		else if (maxRange == quintRange)
		{
			const ISEParams params(ISEMODE_QUINT, curBitsForQuintMode);
			if (computeNumRequiredBits(params, numValuesInSequence) <= numAvailableBits)
				return ISEParams(ISEMODE_QUINT, curBitsForQuintMode);
			curBitsForQuintMode--;
		}
		else
		{
			const ISEParams params(ISEMODE_PLAIN_BIT, curBitsForPlainBitMode);
			DE_ASSERT(maxRange == plainBitRange);
			if (computeNumRequiredBits(params, numValuesInSequence) <= numAvailableBits)
				return ISEParams(ISEMODE_PLAIN_BIT, curBitsForPlainBitMode);
			curBitsForPlainBitMode--;
		}
	}
}
inline int computeNumColorEndpointValues (deUint32 endpointMode)
{
	DE_ASSERT(endpointMode < 16);
	return (endpointMode/4 + 1) * 2;
}
// Decompression utilities
enum DecompressResult
{
	DECOMPRESS_RESULT_VALID_BLOCK	= 0,	//!< Decompressed valid block
	DECOMPRESS_RESULT_ERROR,				//!< Encountered error while decompressing, error color written
	DECOMPRESS_RESULT_LAST
};
// A helper for getting bits from a 128-bit block.
class Block128
{
private:
	typedef deUint64 Word;
	enum
	{
		WORD_BYTES	= sizeof(Word),
		WORD_BITS	= 8*WORD_BYTES,
		NUM_WORDS	= 128 / WORD_BITS
	};
	//DE_STATIC_ASSERT(128 % WORD_BITS == 0);
public:
	Block128 (const deUint8* src)
	{
		for (int wordNdx = 0; wordNdx < NUM_WORDS; wordNdx++)
		{
			m_words[wordNdx] = 0;
			for (int byteNdx = 0; byteNdx < WORD_BYTES; byteNdx++)
				m_words[wordNdx] |= (Word)src[wordNdx*WORD_BYTES + byteNdx] << (8*byteNdx);
		}
	}
	deUint32 getBit (int ndx) const
	{
		DE_ASSERT(basisu_astc::inBounds(ndx, 0, 128));
		return (m_words[ndx / WORD_BITS] >> (ndx % WORD_BITS)) & 1;
	}
	deUint32 getBits (int low, int high) const
	{
		DE_ASSERT(basisu_astc::inBounds(low, 0, 128));
		DE_ASSERT(basisu_astc::inBounds(high, 0, 128));
		DE_ASSERT(basisu_astc::inRange(high-low+1, 0, 32));
		if (high-low+1 == 0)
			return 0;
		const int word0Ndx = low / WORD_BITS;
		const int word1Ndx = high / WORD_BITS;
		// \note "foo << bar << 1" done instead of "foo << (bar+1)" to avoid overflow, i.e. shift amount being too big.
		if (word0Ndx == word1Ndx)
			return (deUint32)((m_words[word0Ndx] & ((((Word)1 << high%WORD_BITS << 1) - 1))) >> ((Word)low % WORD_BITS));
		else
		{
			DE_ASSERT(word1Ndx == word0Ndx + 1);
			return (deUint32)(m_words[word0Ndx] >> (low%WORD_BITS)) |
				   (deUint32)((m_words[word1Ndx] & (((Word)1 << high%WORD_BITS << 1) - 1)) << (high-low - high%WORD_BITS));
		}
	}
	bool isBitSet (int ndx) const
	{
		DE_ASSERT(basisu_astc::inBounds(ndx, 0, 128));
		return getBit(ndx) != 0;
	}
private:
	Word m_words[NUM_WORDS];
};
// A helper for sequential access into a Block128.
class BitAccessStream
{
public:
	BitAccessStream (const Block128& src, int startNdxInSrc, int length, bool forward)
		: m_src				(src)
		, m_startNdxInSrc	(startNdxInSrc)
		, m_length			(length)
		, m_forward			(forward)
		, m_ndx				(0)
	{
	}
	// Get the next num bits. Bits at positions greater than or equal to m_length are zeros.
	deUint32 getNext (int num)
	{
		if (num == 0 || m_ndx >= m_length)
			return 0;
		const int end				= m_ndx + num;
		const int numBitsFromSrc	= basisu_astc::max(0, basisu_astc::min(m_length, end) - m_ndx);
		const int low				= m_ndx;
		const int high				= m_ndx + numBitsFromSrc - 1;
		m_ndx += num;
		return m_forward ?			   m_src.getBits(m_startNdxInSrc + low,  m_startNdxInSrc + high)
						 : reverseBits(m_src.getBits(m_startNdxInSrc - high, m_startNdxInSrc - low), numBitsFromSrc);
	}
private:
	const Block128&		m_src;
	const int			m_startNdxInSrc;
	const int			m_length;
	const bool			m_forward;
	int					m_ndx;
};
struct ISEDecodedResult
{
	deUint32 m;
	deUint32 tq; //!< Trit or quint value, depending on ISE mode.
	deUint32 v;
};
// Data from an ASTC block's "block mode" part (i.e. bits [0,10]).
struct ASTCBlockMode
{
	bool		isError;
	// \note Following fields only relevant if !isError.
	bool		isVoidExtent;
	// \note Following fields only relevant if !isVoidExtent.
	bool		isDualPlane;
	int			weightGridWidth;
	int			weightGridHeight;
	ISEParams	weightISEParams;
	ASTCBlockMode (void)
		: isError			(true)
		, isVoidExtent		(true)
		, isDualPlane		(true)
		, weightGridWidth	(-1)
		, weightGridHeight	(-1)
		, weightISEParams	(ISEMODE_LAST, -1)
	{
	}
};
inline int computeNumWeights (const ASTCBlockMode& mode)
{
	return mode.weightGridWidth * mode.weightGridHeight * (mode.isDualPlane ? 2 : 1);
}
struct ColorEndpointPair
{
	UVec4 e0;
	UVec4 e1;
};
struct TexelWeightPair
{
	deUint32 w[2];
};
ASTCBlockMode getASTCBlockMode (deUint32 blockModeData)
{
	ASTCBlockMode blockMode;
	blockMode.isError = true; // \note Set to false later, if not error.
	blockMode.isVoidExtent = getBits(blockModeData, 0, 8) == 0x1fc;
	if (!blockMode.isVoidExtent)
	{
		if ((getBits(blockModeData, 0, 1) == 0 && getBits(blockModeData, 6, 8) == 7) || getBits(blockModeData, 0, 3) == 0)
			return blockMode; // Invalid ("reserved").
		deUint32 r = (deUint32)-1; // \note Set in the following branches.
		if (getBits(blockModeData, 0, 1) == 0)
		{
			const deUint32 r0	= getBit(blockModeData, 4);
			const deUint32 r1	= getBit(blockModeData, 2);
			const deUint32 r2	= getBit(blockModeData, 3);
			const deUint32 i78	= getBits(blockModeData, 7, 8);
			r = (r2 << 2) | (r1 << 1) | (r0 << 0);
			if (i78 == 3)
			{
				const bool i5 = isBitSet(blockModeData, 5);
				blockMode.weightGridWidth	= i5 ? 10 : 6;
				blockMode.weightGridHeight	= i5 ? 6  : 10;
			}
			else
			{
				const deUint32 a = getBits(blockModeData, 5, 6);
				switch (i78)
				{
					case 0:		blockMode.weightGridWidth = 12;		blockMode.weightGridHeight = a + 2;									break;
					case 1:		blockMode.weightGridWidth = a + 2;	blockMode.weightGridHeight = 12;									break;
					case 2:		blockMode.weightGridWidth = a + 6;	blockMode.weightGridHeight = getBits(blockModeData, 9, 10) + 6;		break;
					default: DE_ASSERT(false);
				}
			}
		}
		else
		{
			const deUint32 r0	= getBit(blockModeData, 4);
			const deUint32 r1	= getBit(blockModeData, 0);
			const deUint32 r2	= getBit(blockModeData, 1);
			const deUint32 i23	= getBits(blockModeData, 2, 3);
			const deUint32 a	= getBits(blockModeData, 5, 6);
			r = (r2 << 2) | (r1 << 1) | (r0 << 0);
			if (i23 == 3)
			{
				const deUint32	b	= getBit(blockModeData, 7);
				const bool		i8	= isBitSet(blockModeData, 8);
				blockMode.weightGridWidth	= i8 ? b+2 : a+2;
				blockMode.weightGridHeight	= i8 ? a+2 : b+6;
			}
			else
			{
				const deUint32 b = getBits(blockModeData, 7, 8);
				switch (i23)
				{
					case 0:		blockMode.weightGridWidth = b + 4;	blockMode.weightGridHeight = a + 2;	break;
					case 1:		blockMode.weightGridWidth = b + 8;	blockMode.weightGridHeight = a + 2;	break;
					case 2:		blockMode.weightGridWidth = a + 2;	blockMode.weightGridHeight = b + 8;	break;
					default: DE_ASSERT(false);
				}
			}
		}
		const bool	zeroDH		= getBits(blockModeData, 0, 1) == 0 && getBits(blockModeData, 7, 8) == 2;
		const bool	h			= zeroDH ? 0 : isBitSet(blockModeData, 9);
		blockMode.isDualPlane	= zeroDH ? 0 : isBitSet(blockModeData, 10);
		{
			ISEMode&	m	= blockMode.weightISEParams.mode;
			int&		b	= blockMode.weightISEParams.numBits;
			m = ISEMODE_PLAIN_BIT;
			b = 0;
			if (h)
			{
				switch (r)
				{
					case 2:							m = ISEMODE_QUINT;	b = 1;	break;
					case 3:		m = ISEMODE_TRIT;						b = 2;	break;
					case 4:												b = 4;	break;
					case 5:							m = ISEMODE_QUINT;	b = 2;	break;
					case 6:		m = ISEMODE_TRIT;						b = 3;	break;
					case 7:												b = 5;	break;
					default:	DE_ASSERT(false);
				}
			}
			else
			{
				switch (r)
				{
					case 2:												b = 1;	break;
					case 3:		m = ISEMODE_TRIT;								break;
					case 4:												b = 2;	break;
					case 5:							m = ISEMODE_QUINT;			break;
					case 6:		m = ISEMODE_TRIT;						b = 1;	break;
					case 7:												b = 3;	break;
					default:	DE_ASSERT(false);
				}
			}
		}
	}
	blockMode.isError = false;
	return blockMode;
}
inline void setASTCErrorColorBlock (void* dst, int blockWidth, int blockHeight, bool isSRGB)
{
	if (isSRGB)
	{
		deUint8* const dstU = (deUint8*)dst;
		for (int i = 0; i < blockWidth*blockHeight; i++)
		{
			dstU[4*i + 0] = 0xff;
			dstU[4*i + 1] = 0;
			dstU[4*i + 2] = 0xff;
			dstU[4*i + 3] = 0xff;
		}
	}
	else
	{
		float* const dstF = (float*)dst;
		for (int i = 0; i < blockWidth*blockHeight; i++)
		{
			dstF[4*i + 0] = 1.0f;
			dstF[4*i + 1] = 0.0f;
			dstF[4*i + 2] = 1.0f;
			dstF[4*i + 3] = 1.0f;
		}
	}
}
DecompressResult decodeVoidExtentBlock (void* dst, const Block128& blockData, int blockWidth, int blockHeight, bool isSRGB, bool isLDRMode)
{
	const deUint32	minSExtent			= blockData.getBits(12, 24);
	const deUint32	maxSExtent			= blockData.getBits(25, 37);
	const deUint32	minTExtent			= blockData.getBits(38, 50);
	const deUint32	maxTExtent			= blockData.getBits(51, 63);
	const bool		allExtentsAllOnes	= minSExtent == 0x1fff && maxSExtent == 0x1fff && minTExtent == 0x1fff && maxTExtent == 0x1fff;
	const bool		isHDRBlock			= blockData.isBitSet(9);
	if ((isLDRMode && isHDRBlock) || (!allExtentsAllOnes && (minSExtent >= maxSExtent || minTExtent >= maxTExtent)))
	{
		setASTCErrorColorBlock(dst, blockWidth, blockHeight, isSRGB);
		return DECOMPRESS_RESULT_ERROR;
	}
	const deUint32 rgba[4] =
	{
		blockData.getBits(64,  79),
		blockData.getBits(80,  95),
		blockData.getBits(96,  111),
		blockData.getBits(112, 127)
	};
	if (isSRGB)
	{
		deUint8* const dstU = (deUint8*)dst;
		for (int i = 0; i < blockWidth*blockHeight; i++)
		for (int c = 0; c < 4; c++)
			dstU[i*4 + c] = (deUint8)((rgba[c] & 0xff00) >> 8);
	}
	else
	{
		float* const dstF = (float*)dst;
		if (isHDRBlock)
		{
			// rg - REMOVING HDR SUPPORT FOR NOW
#if 0
			for (int c = 0; c < 4; c++)
			{
				if (isFloat16InfOrNan((deFloat16)rgba[c]))
					throw InternalError("Infinity or NaN color component in HDR void extent block in ASTC texture (behavior undefined by ASTC specification)");
			}
			for (int i = 0; i < blockWidth*blockHeight; i++)
			for (int c = 0; c < 4; c++)
				dstF[i*4 + c] = deFloat16To32((deFloat16)rgba[c]);
#endif
		}
		else
		{
			for (int i = 0; i < blockWidth*blockHeight; i++)
			for (int c = 0; c < 4; c++)
				dstF[i*4 + c] = rgba[c] == 65535 ? 1.0f : (float)rgba[c] / 65536.0f;
		}
	}
	return DECOMPRESS_RESULT_VALID_BLOCK;
}
void decodeColorEndpointModes (deUint32* endpointModesDst, const Block128& blockData, int numPartitions, int extraCemBitsStart)
{
	if (numPartitions == 1)
		endpointModesDst[0] = blockData.getBits(13, 16);
	else
	{
		const deUint32 highLevelSelector = blockData.getBits(23, 24);
		if (highLevelSelector == 0)
		{
			const deUint32 mode = blockData.getBits(25, 28);
			for (int i = 0; i < numPartitions; i++)
				endpointModesDst[i] = mode;
		}
		else
		{
			for (int partNdx = 0; partNdx < numPartitions; partNdx++)
			{
				const deUint32 cemClass		= highLevelSelector - (blockData.isBitSet(25 + partNdx) ? 0 : 1);
				const deUint32 lowBit0Ndx	= numPartitions + 2*partNdx;
				const deUint32 lowBit1Ndx	= numPartitions + 2*partNdx + 1;
				const deUint32 lowBit0		= blockData.getBit(lowBit0Ndx < 4 ? 25+lowBit0Ndx : extraCemBitsStart+lowBit0Ndx-4);
				const deUint32 lowBit1		= blockData.getBit(lowBit1Ndx < 4 ? 25+lowBit1Ndx : extraCemBitsStart+lowBit1Ndx-4);
				endpointModesDst[partNdx] = (cemClass << 2) | (lowBit1 << 1) | lowBit0;
			}
		}
	}
}
int computeNumColorEndpointValues (const deUint32* endpointModes, int numPartitions)
{
	int result = 0;
	for (int i = 0; i < numPartitions; i++)
		result += computeNumColorEndpointValues(endpointModes[i]);
	return result;
}
void decodeISETritBlock (ISEDecodedResult* dst, int numValues, BitAccessStream& data, int numBits)
{
	DE_ASSERT(basisu_astc::inRange(numValues, 1, 5));
	deUint32 m[5];
	m[0]			= data.getNext(numBits);
	deUint32 T01	= data.getNext(2);
	m[1]			= data.getNext(numBits);
	deUint32 T23	= data.getNext(2);
	m[2]			= data.getNext(numBits);
	deUint32 T4		= data.getNext(1);
	m[3]			= data.getNext(numBits);
	deUint32 T56	= data.getNext(2);
	m[4]			= data.getNext(numBits);
	deUint32 T7		= data.getNext(1);
	switch (numValues)
	{
		// \note Fall-throughs.
		case 1: T23		= 0;
		case 2: T4		= 0;
		case 3: T56		= 0;
		case 4: T7		= 0;
		case 5: break;
		default:
			DE_ASSERT(false);
	}
	const deUint32 T = (T7 << 7) | (T56 << 5) | (T4 << 4) | (T23 << 2) | (T01 << 0);
	static const deUint32 tritsFromT[256][5] =
	{
		{ 0,0,0,0,0 }, { 1,0,0,0,0 }, { 2,0,0,0,0 }, { 0,0,2,0,0 }, { 0,1,0,0,0 }, { 1,1,0,0,0 }, { 2,1,0,0,0 }, { 1,0,2,0,0 }, { 0,2,0,0,0 }, { 1,2,0,0,0 }, { 2,2,0,0,0 }, { 2,0,2,0,0 }, { 0,2,2,0,0 }, { 1,2,2,0,0 }, { 2,2,2,0,0 }, { 2,0,2,0,0 },
		{ 0,0,1,0,0 }, { 1,0,1,0,0 }, { 2,0,1,0,0 }, { 0,1,2,0,0 }, { 0,1,1,0,0 }, { 1,1,1,0,0 }, { 2,1,1,0,0 }, { 1,1,2,0,0 }, { 0,2,1,0,0 }, { 1,2,1,0,0 }, { 2,2,1,0,0 }, { 2,1,2,0,0 }, { 0,0,0,2,2 }, { 1,0,0,2,2 }, { 2,0,0,2,2 }, { 0,0,2,2,2 },
		{ 0,0,0,1,0 }, { 1,0,0,1,0 }, { 2,0,0,1,0 }, { 0,0,2,1,0 }, { 0,1,0,1,0 }, { 1,1,0,1,0 }, { 2,1,0,1,0 }, { 1,0,2,1,0 }, { 0,2,0,1,0 }, { 1,2,0,1,0 }, { 2,2,0,1,0 }, { 2,0,2,1,0 }, { 0,2,2,1,0 }, { 1,2,2,1,0 }, { 2,2,2,1,0 }, { 2,0,2,1,0 },
		{ 0,0,1,1,0 }, { 1,0,1,1,0 }, { 2,0,1,1,0 }, { 0,1,2,1,0 }, { 0,1,1,1,0 }, { 1,1,1,1,0 }, { 2,1,1,1,0 }, { 1,1,2,1,0 }, { 0,2,1,1,0 }, { 1,2,1,1,0 }, { 2,2,1,1,0 }, { 2,1,2,1,0 }, { 0,1,0,2,2 }, { 1,1,0,2,2 }, { 2,1,0,2,2 }, { 1,0,2,2,2 },
		{ 0,0,0,2,0 }, { 1,0,0,2,0 }, { 2,0,0,2,0 }, { 0,0,2,2,0 }, { 0,1,0,2,0 }, { 1,1,0,2,0 }, { 2,1,0,2,0 }, { 1,0,2,2,0 }, { 0,2,0,2,0 }, { 1,2,0,2,0 }, { 2,2,0,2,0 }, { 2,0,2,2,0 }, { 0,2,2,2,0 }, { 1,2,2,2,0 }, { 2,2,2,2,0 }, { 2,0,2,2,0 },
		{ 0,0,1,2,0 }, { 1,0,1,2,0 }, { 2,0,1,2,0 }, { 0,1,2,2,0 }, { 0,1,1,2,0 }, { 1,1,1,2,0 }, { 2,1,1,2,0 }, { 1,1,2,2,0 }, { 0,2,1,2,0 }, { 1,2,1,2,0 }, { 2,2,1,2,0 }, { 2,1,2,2,0 }, { 0,2,0,2,2 }, { 1,2,0,2,2 }, { 2,2,0,2,2 }, { 2,0,2,2,2 },
		{ 0,0,0,0,2 }, { 1,0,0,0,2 }, { 2,0,0,0,2 }, { 0,0,2,0,2 }, { 0,1,0,0,2 }, { 1,1,0,0,2 }, { 2,1,0,0,2 }, { 1,0,2,0,2 }, { 0,2,0,0,2 }, { 1,2,0,0,2 }, { 2,2,0,0,2 }, { 2,0,2,0,2 }, { 0,2,2,0,2 }, { 1,2,2,0,2 }, { 2,2,2,0,2 }, { 2,0,2,0,2 },
		{ 0,0,1,0,2 }, { 1,0,1,0,2 }, { 2,0,1,0,2 }, { 0,1,2,0,2 }, { 0,1,1,0,2 }, { 1,1,1,0,2 }, { 2,1,1,0,2 }, { 1,1,2,0,2 }, { 0,2,1,0,2 }, { 1,2,1,0,2 }, { 2,2,1,0,2 }, { 2,1,2,0,2 }, { 0,2,2,2,2 }, { 1,2,2,2,2 }, { 2,2,2,2,2 }, { 2,0,2,2,2 },
		{ 0,0,0,0,1 }, { 1,0,0,0,1 }, { 2,0,0,0,1 }, { 0,0,2,0,1 }, { 0,1,0,0,1 }, { 1,1,0,0,1 }, { 2,1,0,0,1 }, { 1,0,2,0,1 }, { 0,2,0,0,1 }, { 1,2,0,0,1 }, { 2,2,0,0,1 }, { 2,0,2,0,1 }, { 0,2,2,0,1 }, { 1,2,2,0,1 }, { 2,2,2,0,1 }, { 2,0,2,0,1 },
		{ 0,0,1,0,1 }, { 1,0,1,0,1 }, { 2,0,1,0,1 }, { 0,1,2,0,1 }, { 0,1,1,0,1 }, { 1,1,1,0,1 }, { 2,1,1,0,1 }, { 1,1,2,0,1 }, { 0,2,1,0,1 }, { 1,2,1,0,1 }, { 2,2,1,0,1 }, { 2,1,2,0,1 }, { 0,0,1,2,2 }, { 1,0,1,2,2 }, { 2,0,1,2,2 }, { 0,1,2,2,2 },
		{ 0,0,0,1,1 }, { 1,0,0,1,1 }, { 2,0,0,1,1 }, { 0,0,2,1,1 }, { 0,1,0,1,1 }, { 1,1,0,1,1 }, { 2,1,0,1,1 }, { 1,0,2,1,1 }, { 0,2,0,1,1 }, { 1,2,0,1,1 }, { 2,2,0,1,1 }, { 2,0,2,1,1 }, { 0,2,2,1,1 }, { 1,2,2,1,1 }, { 2,2,2,1,1 }, { 2,0,2,1,1 },
		{ 0,0,1,1,1 }, { 1,0,1,1,1 }, { 2,0,1,1,1 }, { 0,1,2,1,1 }, { 0,1,1,1,1 }, { 1,1,1,1,1 }, { 2,1,1,1,1 }, { 1,1,2,1,1 }, { 0,2,1,1,1 }, { 1,2,1,1,1 }, { 2,2,1,1,1 }, { 2,1,2,1,1 }, { 0,1,1,2,2 }, { 1,1,1,2,2 }, { 2,1,1,2,2 }, { 1,1,2,2,2 },
		{ 0,0,0,2,1 }, { 1,0,0,2,1 }, { 2,0,0,2,1 }, { 0,0,2,2,1 }, { 0,1,0,2,1 }, { 1,1,0,2,1 }, { 2,1,0,2,1 }, { 1,0,2,2,1 }, { 0,2,0,2,1 }, { 1,2,0,2,1 }, { 2,2,0,2,1 }, { 2,0,2,2,1 }, { 0,2,2,2,1 }, { 1,2,2,2,1 }, { 2,2,2,2,1 }, { 2,0,2,2,1 },
		{ 0,0,1,2,1 }, { 1,0,1,2,1 }, { 2,0,1,2,1 }, { 0,1,2,2,1 }, { 0,1,1,2,1 }, { 1,1,1,2,1 }, { 2,1,1,2,1 }, { 1,1,2,2,1 }, { 0,2,1,2,1 }, { 1,2,1,2,1 }, { 2,2,1,2,1 }, { 2,1,2,2,1 }, { 0,2,1,2,2 }, { 1,2,1,2,2 }, { 2,2,1,2,2 }, { 2,1,2,2,2 },
		{ 0,0,0,1,2 }, { 1,0,0,1,2 }, { 2,0,0,1,2 }, { 0,0,2,1,2 }, { 0,1,0,1,2 }, { 1,1,0,1,2 }, { 2,1,0,1,2 }, { 1,0,2,1,2 }, { 0,2,0,1,2 }, { 1,2,0,1,2 }, { 2,2,0,1,2 }, { 2,0,2,1,2 }, { 0,2,2,1,2 }, { 1,2,2,1,2 }, { 2,2,2,1,2 }, { 2,0,2,1,2 },
		{ 0,0,1,1,2 }, { 1,0,1,1,2 }, { 2,0,1,1,2 }, { 0,1,2,1,2 }, { 0,1,1,1,2 }, { 1,1,1,1,2 }, { 2,1,1,1,2 }, { 1,1,2,1,2 }, { 0,2,1,1,2 }, { 1,2,1,1,2 }, { 2,2,1,1,2 }, { 2,1,2,1,2 }, { 0,2,2,2,2 }, { 1,2,2,2,2 }, { 2,2,2,2,2 }, { 2,1,2,2,2 }
	};
	const deUint32 (& trits)[5] = tritsFromT[T];
	for (int i = 0; i < numValues; i++)
	{
		dst[i].m	= m[i];
		dst[i].tq	= trits[i];
		dst[i].v	= (trits[i] << numBits) + m[i];
	}
}
void decodeISEQuintBlock (ISEDecodedResult* dst, int numValues, BitAccessStream& data, int numBits)
{
	DE_ASSERT(basisu_astc::inRange(numValues, 1, 3));
	deUint32 m[3];
	m[0]			= data.getNext(numBits);
	deUint32 Q012	= data.getNext(3);
	m[1]			= data.getNext(numBits);
	deUint32 Q34	= data.getNext(2);
	m[2]			= data.getNext(numBits);
	deUint32 Q56	= data.getNext(2);
	switch (numValues)
	{
		// \note Fall-throughs.
		case 1: Q34		= 0;
		case 2: Q56		= 0;
		case 3: break;
		default:
			DE_ASSERT(false);
	}
	const deUint32 Q = (Q56 << 5) | (Q34 << 3) | (Q012 << 0);
	static const deUint32 quintsFromQ[256][3] =
	{
		{ 0,0,0 }, { 1,0,0 }, { 2,0,0 }, { 3,0,0 }, { 4,0,0 }, { 0,4,0 }, { 4,4,0 }, { 4,4,4 }, { 0,1,0 }, { 1,1,0 }, { 2,1,0 }, { 3,1,0 }, { 4,1,0 }, { 1,4,0 }, { 4,4,1 }, { 4,4,4 },
		{ 0,2,0 }, { 1,2,0 }, { 2,2,0 }, { 3,2,0 }, { 4,2,0 }, { 2,4,0 }, { 4,4,2 }, { 4,4,4 }, { 0,3,0 }, { 1,3,0 }, { 2,3,0 }, { 3,3,0 }, { 4,3,0 }, { 3,4,0 }, { 4,4,3 }, { 4,4,4 },
		{ 0,0,1 }, { 1,0,1 }, { 2,0,1 }, { 3,0,1 }, { 4,0,1 }, { 0,4,1 }, { 4,0,4 }, { 0,4,4 }, { 0,1,1 }, { 1,1,1 }, { 2,1,1 }, { 3,1,1 }, { 4,1,1 }, { 1,4,1 }, { 4,1,4 }, { 1,4,4 },
		{ 0,2,1 }, { 1,2,1 }, { 2,2,1 }, { 3,2,1 }, { 4,2,1 }, { 2,4,1 }, { 4,2,4 }, { 2,4,4 }, { 0,3,1 }, { 1,3,1 }, { 2,3,1 }, { 3,3,1 }, { 4,3,1 }, { 3,4,1 }, { 4,3,4 }, { 3,4,4 },
		{ 0,0,2 }, { 1,0,2 }, { 2,0,2 }, { 3,0,2 }, { 4,0,2 }, { 0,4,2 }, { 2,0,4 }, { 3,0,4 }, { 0,1,2 }, { 1,1,2 }, { 2,1,2 }, { 3,1,2 }, { 4,1,2 }, { 1,4,2 }, { 2,1,4 }, { 3,1,4 },
		{ 0,2,2 }, { 1,2,2 }, { 2,2,2 }, { 3,2,2 }, { 4,2,2 }, { 2,4,2 }, { 2,2,4 }, { 3,2,4 }, { 0,3,2 }, { 1,3,2 }, { 2,3,2 }, { 3,3,2 }, { 4,3,2 }, { 3,4,2 }, { 2,3,4 }, { 3,3,4 },
		{ 0,0,3 }, { 1,0,3 }, { 2,0,3 }, { 3,0,3 }, { 4,0,3 }, { 0,4,3 }, { 0,0,4 }, { 1,0,4 }, { 0,1,3 }, { 1,1,3 }, { 2,1,3 }, { 3,1,3 }, { 4,1,3 }, { 1,4,3 }, { 0,1,4 }, { 1,1,4 },
		{ 0,2,3 }, { 1,2,3 }, { 2,2,3 }, { 3,2,3 }, { 4,2,3 }, { 2,4,3 }, { 0,2,4 }, { 1,2,4 }, { 0,3,3 }, { 1,3,3 }, { 2,3,3 }, { 3,3,3 }, { 4,3,3 }, { 3,4,3 }, { 0,3,4 }, { 1,3,4 }
	};
	const deUint32 (& quints)[3] = quintsFromQ[Q];
	for (int i = 0; i < numValues; i++)
	{
		dst[i].m	= m[i];
		dst[i].tq	= quints[i];
		dst[i].v	= (quints[i] << numBits) + m[i];
	}
}
inline void decodeISEBitBlock (ISEDecodedResult* dst, BitAccessStream& data, int numBits)
{
	dst[0].m = data.getNext(numBits);
	dst[0].v = dst[0].m;
}
void decodeISE (ISEDecodedResult* dst, int numValues, BitAccessStream& data, const ISEParams& params)
{
	if (params.mode == ISEMODE_TRIT)
	{
		const int numBlocks = deDivRoundUp32(numValues, 5);
		for (int blockNdx = 0; blockNdx < numBlocks; blockNdx++)
		{
			const int numValuesInBlock = blockNdx == numBlocks-1 ? numValues - 5*(numBlocks-1) : 5;
			decodeISETritBlock(&dst[5*blockNdx], numValuesInBlock, data, params.numBits);
		}
	}
	else if (params.mode == ISEMODE_QUINT)
	{
		const int numBlocks = deDivRoundUp32(numValues, 3);
		for (int blockNdx = 0; blockNdx < numBlocks; blockNdx++)
		{
			const int numValuesInBlock = blockNdx == numBlocks-1 ? numValues - 3*(numBlocks-1) : 3;
			decodeISEQuintBlock(&dst[3*blockNdx], numValuesInBlock, data, params.numBits);
		}
	}
	else
	{
		DE_ASSERT(params.mode == ISEMODE_PLAIN_BIT);
		for (int i = 0; i < numValues; i++)
			decodeISEBitBlock(&dst[i], data, params.numBits);
	}
}
void unquantizeColorEndpoints (deUint32* dst, const ISEDecodedResult* iseResults, int numEndpoints, const ISEParams& iseParams)
{
	if (iseParams.mode == ISEMODE_TRIT || iseParams.mode == ISEMODE_QUINT)
	{
		const int rangeCase				= iseParams.numBits*2 - (iseParams.mode == ISEMODE_TRIT ? 2 : 1);
		DE_ASSERT(basisu_astc::inRange(rangeCase, 0, 10));
		static const deUint32	Ca[11]	= { 204, 113, 93, 54, 44, 26, 22, 13, 11, 6, 5 };
		const deUint32			C		= Ca[rangeCase];
		for (int endpointNdx = 0; endpointNdx < numEndpoints; endpointNdx++)
		{
			const deUint32 a = getBit(iseResults[endpointNdx].m, 0);
			const deUint32 b = getBit(iseResults[endpointNdx].m, 1);
			const deUint32 c = getBit(iseResults[endpointNdx].m, 2);
			const deUint32 d = getBit(iseResults[endpointNdx].m, 3);
			const deUint32 e = getBit(iseResults[endpointNdx].m, 4);
			const deUint32 f = getBit(iseResults[endpointNdx].m, 5);
			const deUint32 A = a == 0 ? 0 : (1<<9)-1;
			const deUint32 B = rangeCase == 0	? 0
							 : rangeCase == 1	? 0
							 : rangeCase == 2	? (b << 8) |									(b << 4) |				(b << 2) |	(b << 1)
							 : rangeCase == 3	? (b << 8) |												(b << 3) |	(b << 2)
							 : rangeCase == 4	? (c << 8) | (b << 7) |										(c << 3) |	(b << 2) |	(c << 1) |	(b << 0)
							 : rangeCase == 5	? (c << 8) | (b << 7) |													(c << 2) |	(b << 1) |	(c << 0)
							 : rangeCase == 6	? (d << 8) | (c << 7) | (b << 6) |										(d << 2) |	(c << 1) |	(b << 0)
							 : rangeCase == 7	? (d << 8) | (c << 7) | (b << 6) |													(d << 1) |	(c << 0)
							 : rangeCase == 8	? (e << 8) | (d << 7) | (c << 6) | (b << 5) |										(e << 1) |	(d << 0)
							 : rangeCase == 9	? (e << 8) | (d << 7) | (c << 6) | (b << 5) |													(e << 0)
							 : rangeCase == 10	? (f << 8) | (e << 7) | (d << 6) | (c << 5) |	(b << 4) |										(f << 0)
							 : (deUint32)-1;
			DE_ASSERT(B != (deUint32)-1);
			dst[endpointNdx] = (((iseResults[endpointNdx].tq*C + B) ^ A) >> 2) | (A & 0x80);
		}
	}
	else
	{
		DE_ASSERT(iseParams.mode == ISEMODE_PLAIN_BIT);
		for (int endpointNdx = 0; endpointNdx < numEndpoints; endpointNdx++)
			dst[endpointNdx] = bitReplicationScale(iseResults[endpointNdx].v, iseParams.numBits, 8);
	}
}
inline void bitTransferSigned (deInt32& a, deInt32& b)
{
	b >>= 1;
	b |= a & 0x80;
	a >>= 1;
	a &= 0x3f;
	if (isBitSet(a, 5))
		a -= 0x40;
}
inline UVec4 clampedRGBA (const IVec4& rgba)
{
	return UVec4(basisu_astc::clamp(rgba.x(), 0, 0xff),
		basisu_astc::clamp(rgba.y(), 0, 0xff),
		basisu_astc::clamp(rgba.z(), 0, 0xff),
		basisu_astc::clamp(rgba.w(), 0, 0xff));
}
inline IVec4 blueContract (int r, int g, int b, int a)
{
	return IVec4((r+b)>>1, (g+b)>>1, b, a);
}
inline bool isColorEndpointModeHDR (deUint32 mode)
{
	return mode == 2	||
		   mode == 3	||
		   mode == 7	||
		   mode == 11	||
		   mode == 14	||
		   mode == 15;
}
void decodeHDREndpointMode7 (UVec4& e0, UVec4& e1, deUint32 v0, deUint32 v1, deUint32 v2, deUint32 v3)
{
	const deUint32 m10		= getBit(v1, 7) | (getBit(v2, 7) << 1);
	const deUint32 m23		= getBits(v0, 6, 7);
	const deUint32 majComp	= m10 != 3	? m10
							: m23 != 3	? m23
							:			  0;
	const deUint32 mode		= m10 != 3	? m23
							: m23 != 3	? 4
							:			  5;
	deInt32			red		= (deInt32)getBits(v0, 0, 5);
	deInt32			green	= (deInt32)getBits(v1, 0, 4);
	deInt32			blue	= (deInt32)getBits(v2, 0, 4);
	deInt32			scale	= (deInt32)getBits(v3, 0, 4);
	{
#define SHOR(DST_VAR, SHIFT, BIT_VAR) (DST_VAR) |= (BIT_VAR) << (SHIFT)
#define ASSIGN_X_BITS(V0,S0, V1,S1, V2,S2, V3,S3, V4,S4, V5,S5, V6,S6) do { SHOR(V0,S0,x0); SHOR(V1,S1,x1); SHOR(V2,S2,x2); SHOR(V3,S3,x3); SHOR(V4,S4,x4); SHOR(V5,S5,x5); SHOR(V6,S6,x6); } while (false)
		const deUint32	x0	= getBit(v1, 6);
		const deUint32	x1	= getBit(v1, 5);
		const deUint32	x2	= getBit(v2, 6);
		const deUint32	x3	= getBit(v2, 5);
		const deUint32	x4	= getBit(v3, 7);
		const deUint32	x5	= getBit(v3, 6);
		const deUint32	x6	= getBit(v3, 5);
		deInt32&		R	= red;
		deInt32&		G	= green;
		deInt32&		B	= blue;
		deInt32&		S	= scale;
		switch (mode)
		{
			case 0: ASSIGN_X_BITS(R,9,  R,8,  R,7,  R,10,  R,6,  S,6,   S,5); break;
			case 1: ASSIGN_X_BITS(R,8,  G,5,  R,7,  B,5,   R,6,  R,10,  R,9); break;
			case 2: ASSIGN_X_BITS(R,9,  R,8,  R,7,  R,6,   S,7,  S,6,   S,5); break;
			case 3: ASSIGN_X_BITS(R,8,  G,5,  R,7,  B,5,   R,6,  S,6,   S,5); break;
			case 4: ASSIGN_X_BITS(G,6,  G,5,  B,6,  B,5,   R,6,  R,7,   S,5); break;
			case 5: ASSIGN_X_BITS(G,6,  G,5,  B,6,  B,5,   R,6,  S,6,   S,5); break;
			default:
				DE_ASSERT(false);
		}
#undef ASSIGN_X_BITS
#undef SHOR
	}
	static const int shiftAmounts[] = { 1, 1, 2, 3, 4, 5 };
	DE_ASSERT(mode < DE_LENGTH_OF_ARRAY(shiftAmounts));
	red		<<= shiftAmounts[mode];
	green	<<= shiftAmounts[mode];
	blue	<<= shiftAmounts[mode];
	scale	<<= shiftAmounts[mode];
	if (mode != 5)
	{
		green	= red - green;
		blue	= red - blue;
	}
	if (majComp == 1)
		std::swap(red, green);
	else if (majComp == 2)
		std::swap(red, blue);
	e0 = UVec4(basisu_astc::clamp(red	- scale,	0, 0xfff),
		basisu_astc::clamp(green	- scale,	0, 0xfff),
		basisu_astc::clamp(blue	- scale,	0, 0xfff),
			   0x780);
	e1 = UVec4(basisu_astc::clamp(red,				0, 0xfff),
		basisu_astc::clamp(green,				0, 0xfff),
		basisu_astc::clamp(blue,				0, 0xfff),
			   0x780);
}
void decodeHDREndpointMode11 (UVec4& e0, UVec4& e1, deUint32 v0, deUint32 v1, deUint32 v2, deUint32 v3, deUint32 v4, deUint32 v5)
{
	const deUint32 major = (getBit(v5, 7) << 1) | getBit(v4, 7);
	if (major == 3)
	{
		e0 = UVec4(v0<<4, v2<<4, getBits(v4,0,6)<<5, 0x780);
		e1 = UVec4(v1<<4, v3<<4, getBits(v5,0,6)<<5, 0x780);
	}
	else
	{
		const deUint32 mode = (getBit(v3, 7) << 2) | (getBit(v2, 7) << 1) | getBit(v1, 7);
		deInt32 a	= (deInt32)((getBit(v1, 6) << 8) | v0);
		deInt32 c	= (deInt32)(getBits(v1, 0, 5));
		deInt32 b0	= (deInt32)(getBits(v2, 0, 5));
		deInt32 b1	= (deInt32)(getBits(v3, 0, 5));
		deInt32 d0	= (deInt32)(getBits(v4, 0, 4));
		deInt32 d1	= (deInt32)(getBits(v5, 0, 4));
		{
#define SHOR(DST_VAR, SHIFT, BIT_VAR) (DST_VAR) |= (BIT_VAR) << (SHIFT)
#define ASSIGN_X_BITS(V0,S0, V1,S1, V2,S2, V3,S3, V4,S4, V5,S5) do { SHOR(V0,S0,x0); SHOR(V1,S1,x1); SHOR(V2,S2,x2); SHOR(V3,S3,x3); SHOR(V4,S4,x4); SHOR(V5,S5,x5); } while (false)
			const deUint32 x0 = getBit(v2, 6);
			const deUint32 x1 = getBit(v3, 6);
			const deUint32 x2 = getBit(v4, 6);
			const deUint32 x3 = getBit(v5, 6);
			const deUint32 x4 = getBit(v4, 5);
			const deUint32 x5 = getBit(v5, 5);
			switch (mode)
			{
				case 0: ASSIGN_X_BITS(b0,6,  b1,6,   d0,6,  d1,6,  d0,5,  d1,5); break;
				case 1: ASSIGN_X_BITS(b0,6,  b1,6,   b0,7,  b1,7,  d0,5,  d1,5); break;
				case 2: ASSIGN_X_BITS(a,9,   c,6,    d0,6,  d1,6,  d0,5,  d1,5); break;
				case 3: ASSIGN_X_BITS(b0,6,  b1,6,   a,9,   c,6,   d0,5,  d1,5); break;
				case 4: ASSIGN_X_BITS(b0,6,  b1,6,   b0,7,  b1,7,  a,9,   a,10); break;
				case 5: ASSIGN_X_BITS(a,9,   a,10,   c,7,   c,6,   d0,5,  d1,5); break;
				case 6: ASSIGN_X_BITS(b0,6,  b1,6,   a,11,  c,6,   a,9,   a,10); break;
				case 7: ASSIGN_X_BITS(a,9,   a,10,   a,11,  c,6,   d0,5,  d1,5); break;
				default:
					DE_ASSERT(false);
			}
#undef ASSIGN_X_BITS
#undef SHOR
		}
		static const int numDBits[] = { 7, 6, 7, 6, 5, 6, 5, 6 };
		DE_ASSERT(mode < DE_LENGTH_OF_ARRAY(numDBits));
		d0 = signExtend(d0, numDBits[mode]);
		d1 = signExtend(d1, numDBits[mode]);
		const int shiftAmount = (mode >> 1) ^ 3;
		a	<<= shiftAmount;
		c	<<= shiftAmount;
		b0	<<= shiftAmount;
		b1	<<= shiftAmount;
		d0	<<= shiftAmount;
		d1	<<= shiftAmount;
		e0 = UVec4(basisu_astc::clamp(a-c,			0, 0xfff),
			basisu_astc::clamp(a-b0-c-d0,		0, 0xfff),
			basisu_astc::clamp(a-b1-c-d1,		0, 0xfff),
				   0x780);
		e1 = UVec4(basisu_astc::clamp(a,				0, 0xfff),
			basisu_astc::clamp(a-b0,			0, 0xfff),
			basisu_astc::clamp(a-b1,			0, 0xfff),
				   0x780);
		if (major == 1)
		{
			std::swap(e0.x(), e0.y());
			std::swap(e1.x(), e1.y());
		}
		else if (major == 2)
		{
			std::swap(e0.x(), e0.z());
			std::swap(e1.x(), e1.z());
		}
	}
}
void decodeHDREndpointMode15(UVec4& e0, UVec4& e1, deUint32 v0, deUint32 v1, deUint32 v2, deUint32 v3, deUint32 v4, deUint32 v5, deUint32 v6In, deUint32 v7In)
{
	decodeHDREndpointMode11(e0, e1, v0, v1, v2, v3, v4, v5);
	const deUint32	mode	= (getBit(v7In, 7) << 1) | getBit(v6In, 7);
	deInt32			v6		= (deInt32)getBits(v6In, 0, 6);
	deInt32			v7		= (deInt32)getBits(v7In, 0, 6);
	if (mode == 3)
	{
		e0.w() = v6 << 5;
		e1.w() = v7 << 5;
	}
	else
	{
		v6 |= (v7 << (mode+1)) & 0x780;
		v7 &= (0x3f >> mode);
		v7 ^= 0x20 >> mode;
		v7 -= 0x20 >> mode;
		v6 <<= 4-mode;
		v7 <<= 4-mode;
		v7 += v6;
		v7 = basisu_astc::clamp(v7, 0, 0xfff);
		e0.w() = v6;
		e1.w() = v7;
	}
}
void decodeColorEndpoints (ColorEndpointPair* dst, const deUint32* unquantizedEndpoints, const deUint32* endpointModes, int numPartitions)
{
	int unquantizedNdx = 0;
	for (int partitionNdx = 0; partitionNdx < numPartitions; partitionNdx++)
	{
		const deUint32		endpointMode	= endpointModes[partitionNdx];
		const deUint32*		v				= &unquantizedEndpoints[unquantizedNdx];
		UVec4&				e0				= dst[partitionNdx].e0;
		UVec4&				e1				= dst[partitionNdx].e1;
		unquantizedNdx += computeNumColorEndpointValues(endpointMode);
		switch (endpointMode)
		{
			case 0:
				e0 = UVec4(v[0], v[0], v[0], 0xff);
				e1 = UVec4(v[1], v[1], v[1], 0xff);
				break;
			case 1:
			{
				const deUint32 L0 = (v[0] >> 2) | (getBits(v[1], 6, 7) << 6);
				const deUint32 L1 = basisu_astc::min(0xffu, L0 + getBits(v[1], 0, 5));
				e0 = UVec4(L0, L0, L0, 0xff);
				e1 = UVec4(L1, L1, L1, 0xff);
				break;
			}
			case 2:
			{
				const deUint32 v1Gr		= v[1] >= v[0];
				const deUint32 y0		= v1Gr ? v[0]<<4 : (v[1]<<4) + 8;
				const deUint32 y1		= v1Gr ? v[1]<<4 : (v[0]<<4) - 8;
				e0 = UVec4(y0, y0, y0, 0x780);
				e1 = UVec4(y1, y1, y1, 0x780);
				break;
			}
			case 3:
			{
				const bool		m	= isBitSet(v[0], 7);
				const deUint32	y0	= m ? (getBits(v[1], 5, 7) << 9) | (getBits(v[0], 0, 6) << 2)
										: (getBits(v[1], 4, 7) << 8) | (getBits(v[0], 0, 6) << 1);
				const deUint32	d	= m ? getBits(v[1], 0, 4) << 2
										: getBits(v[1], 0, 3) << 1;
				const deUint32	y1	= basisu_astc::min(0xfffu, y0+d);
				e0 = UVec4(y0, y0, y0, 0x780);
				e1 = UVec4(y1, y1, y1, 0x780);
				break;
			}
			case 4:
				e0 = UVec4(v[0], v[0], v[0], v[2]);
				e1 = UVec4(v[1], v[1], v[1], v[3]);
				break;
			case 5:
			{
				deInt32 v0 = (deInt32)v[0];
				deInt32 v1 = (deInt32)v[1];
				deInt32 v2 = (deInt32)v[2];
				deInt32 v3 = (deInt32)v[3];
				bitTransferSigned(v1, v0);
				bitTransferSigned(v3, v2);
				e0 = clampedRGBA(IVec4(v0,		v0,		v0,		v2));
				e1 = clampedRGBA(IVec4(v0+v1,	v0+v1,	v0+v1,	v2+v3));
				break;
			}
			case 6:
				e0 = UVec4((v[0]*v[3]) >> 8,	(v[1]*v[3]) >> 8,	(v[2]*v[3]) >> 8,	0xff);
				e1 = UVec4(v[0],				v[1],				v[2],				0xff);
				break;
			case 7:
				decodeHDREndpointMode7(e0, e1, v[0], v[1], v[2], v[3]);
				break;
			case 8:
				if (v[1]+v[3]+v[5] >= v[0]+v[2]+v[4])
				{
					e0 = UVec4(v[0], v[2], v[4], 0xff);
					e1 = UVec4(v[1], v[3], v[5], 0xff);
				}
				else
				{
					e0 = blueContract(v[1], v[3], v[5], 0xff).asUint();
					e1 = blueContract(v[0], v[2], v[4], 0xff).asUint();
				}
				break;
			case 9:
			{
				deInt32 v0 = (deInt32)v[0];
				deInt32 v1 = (deInt32)v[1];
				deInt32 v2 = (deInt32)v[2];
				deInt32 v3 = (deInt32)v[3];
				deInt32 v4 = (deInt32)v[4];
				deInt32 v5 = (deInt32)v[5];
				bitTransferSigned(v1, v0);
				bitTransferSigned(v3, v2);
				bitTransferSigned(v5, v4);
				if (v1+v3+v5 >= 0)
				{
					e0 = clampedRGBA(IVec4(v0,		v2,		v4,		0xff));
					e1 = clampedRGBA(IVec4(v0+v1,	v2+v3,	v4+v5,	0xff));
				}
				else
				{
					e0 = clampedRGBA(blueContract(v0+v1,	v2+v3,	v4+v5,	0xff));
					e1 = clampedRGBA(blueContract(v0,		v2,		v4,		0xff));
				}
				break;
			}
			case 10:
				e0 = UVec4((v[0]*v[3]) >> 8,	(v[1]*v[3]) >> 8,	(v[2]*v[3]) >> 8,	v[4]);
				e1 = UVec4(v[0],				v[1],				v[2],				v[5]);
				break;
			case 11:
				decodeHDREndpointMode11(e0, e1, v[0], v[1], v[2], v[3], v[4], v[5]);
				break;
			case 12:
				if (v[1]+v[3]+v[5] >= v[0]+v[2]+v[4])
				{
					e0 = UVec4(v[0], v[2], v[4], v[6]);
					e1 = UVec4(v[1], v[3], v[5], v[7]);
				}
				else
				{
					e0 = clampedRGBA(blueContract(v[1], v[3], v[5], v[7]));
					e1 = clampedRGBA(blueContract(v[0], v[2], v[4], v[6]));
				}
				break;
			case 13:
			{
				deInt32 v0 = (deInt32)v[0];
				deInt32 v1 = (deInt32)v[1];
				deInt32 v2 = (deInt32)v[2];
				deInt32 v3 = (deInt32)v[3];
				deInt32 v4 = (deInt32)v[4];
				deInt32 v5 = (deInt32)v[5];
				deInt32 v6 = (deInt32)v[6];
				deInt32 v7 = (deInt32)v[7];
				bitTransferSigned(v1, v0);
				bitTransferSigned(v3, v2);
				bitTransferSigned(v5, v4);
				bitTransferSigned(v7, v6);
				if (v1+v3+v5 >= 0)
				{
					e0 = clampedRGBA(IVec4(v0,		v2,		v4,		v6));
					e1 = clampedRGBA(IVec4(v0+v1,	v2+v3,	v4+v5,	v6+v7));
				}
				else
				{
					e0 = clampedRGBA(blueContract(v0+v1,	v2+v3,	v4+v5,	v6+v7));
					e1 = clampedRGBA(blueContract(v0,		v2,		v4,		v6));
				}
				break;
			}
			case 14:
				decodeHDREndpointMode11(e0, e1, v[0], v[1], v[2], v[3], v[4], v[5]);
				e0.w() = v[6];
				e1.w() = v[7];
				break;
			case 15:
				decodeHDREndpointMode15(e0, e1, v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7]);
				break;
			default:
				DE_ASSERT(false);
		}
	}
}
void computeColorEndpoints (ColorEndpointPair* dst, const Block128& blockData, const deUint32* endpointModes, int numPartitions, int numColorEndpointValues, const ISEParams& iseParams, int numBitsAvailable)
{
	const int			colorEndpointDataStart = numPartitions == 1 ? 17 : 29;
	ISEDecodedResult	colorEndpointData[18];
	{
		BitAccessStream dataStream(blockData, colorEndpointDataStart, numBitsAvailable, true);
		decodeISE(&colorEndpointData[0], numColorEndpointValues, dataStream, iseParams);
	}
	{
		deUint32 unquantizedEndpoints[18];
		unquantizeColorEndpoints(&unquantizedEndpoints[0], &colorEndpointData[0], numColorEndpointValues, iseParams);
		decodeColorEndpoints(dst, &unquantizedEndpoints[0], &endpointModes[0], numPartitions);
	}
}
void unquantizeWeights (deUint32 dst[64], const ISEDecodedResult* weightGrid, const ASTCBlockMode& blockMode)
{
	const int			numWeights	= computeNumWeights(blockMode);
	const ISEParams&	iseParams	= blockMode.weightISEParams;
	if (iseParams.mode == ISEMODE_TRIT || iseParams.mode == ISEMODE_QUINT)
	{
		const int rangeCase = iseParams.numBits*2 + (iseParams.mode == ISEMODE_QUINT ? 1 : 0);
		if (rangeCase == 0 || rangeCase == 1)
		{
			static const deUint32 map0[3]	= { 0, 32, 63 };
			static const deUint32 map1[5]	= { 0, 16, 32, 47, 63 };
			const deUint32* const map		= rangeCase == 0 ? &map0[0] : &map1[0];
			for (int i = 0; i < numWeights; i++)
			{
				DE_ASSERT(weightGrid[i].v < (rangeCase == 0 ? 3u : 5u));
				dst[i] = map[weightGrid[i].v];
			}
		}
		else
		{
			DE_ASSERT(rangeCase <= 6);
			static const deUint32	Ca[5]	= { 50, 28, 23, 13, 11 };
			const deUint32			C		= Ca[rangeCase-2];
			for (int weightNdx = 0; weightNdx < numWeights; weightNdx++)
			{
				const deUint32 a = getBit(weightGrid[weightNdx].m, 0);
				const deUint32 b = getBit(weightGrid[weightNdx].m, 1);
				const deUint32 c = getBit(weightGrid[weightNdx].m, 2);
				const deUint32 A = a == 0 ? 0 : (1<<7)-1;
				const deUint32 B = rangeCase == 2 ? 0
								 : rangeCase == 3 ? 0
								 : rangeCase == 4 ? (b << 6) |					(b << 2) |				(b << 0)
								 : rangeCase == 5 ? (b << 6) |								(b << 1)
								 : rangeCase == 6 ? (c << 6) | (b << 5) |					(c << 1) |	(b << 0)
								 : (deUint32)-1;
				dst[weightNdx] = (((weightGrid[weightNdx].tq*C + B) ^ A) >> 2) | (A & 0x20);
			}
		}
	}
	else
	{
		DE_ASSERT(iseParams.mode == ISEMODE_PLAIN_BIT);
		for (int weightNdx = 0; weightNdx < numWeights; weightNdx++)
			dst[weightNdx] = bitReplicationScale(weightGrid[weightNdx].v, iseParams.numBits, 6);
	}
	for (int weightNdx = 0; weightNdx < numWeights; weightNdx++)
		dst[weightNdx] += dst[weightNdx] > 32 ? 1 : 0;
	// Initialize nonexistent weights to poison values
	for (int weightNdx = numWeights; weightNdx < 64; weightNdx++)
		dst[weightNdx] = ~0u;
}
void interpolateWeights (TexelWeightPair* dst, const deUint32 (&unquantizedWeights) [64], int blockWidth, int blockHeight, const ASTCBlockMode& blockMode)
{
	const int		numWeightsPerTexel	= blockMode.isDualPlane ? 2 : 1;
	const deUint32	scaleX				= (1024 + blockWidth/2) / (blockWidth-1);
	const deUint32	scaleY				= (1024 + blockHeight/2) / (blockHeight-1);
	DE_ASSERT(blockMode.weightGridWidth*blockMode.weightGridHeight*numWeightsPerTexel <= DE_LENGTH_OF_ARRAY(unquantizedWeights));
	for (int texelY = 0; texelY < blockHeight; texelY++)
	{
		for (int texelX = 0; texelX < blockWidth; texelX++)
		{
			const deUint32 gX	= (scaleX*texelX*(blockMode.weightGridWidth-1) + 32) >> 6;
			const deUint32 gY	= (scaleY*texelY*(blockMode.weightGridHeight-1) + 32) >> 6;
			const deUint32 jX	= gX >> 4;
			const deUint32 jY	= gY >> 4;
			const deUint32 fX	= gX & 0xf;
			const deUint32 fY	= gY & 0xf;
			const deUint32 w11	= (fX*fY + 8) >> 4;
			const deUint32 w10	= fY - w11;
			const deUint32 w01	= fX - w11;
			const deUint32 w00	= 16 - fX - fY + w11;
			const deUint32 i00	= jY*blockMode.weightGridWidth + jX;
			const deUint32 i01	= i00 + 1;
			const deUint32 i10	= i00 + blockMode.weightGridWidth;
			const deUint32 i11	= i00 + blockMode.weightGridWidth + 1;
			// These addresses can be out of bounds, but respective weights will be 0 then.
			DE_ASSERT(deInBounds32(i00, 0, blockMode.weightGridWidth*blockMode.weightGridHeight) || w00 == 0);
			DE_ASSERT(deInBounds32(i01, 0, blockMode.weightGridWidth*blockMode.weightGridHeight) || w01 == 0);
			DE_ASSERT(deInBounds32(i10, 0, blockMode.weightGridWidth*blockMode.weightGridHeight) || w10 == 0);
			DE_ASSERT(deInBounds32(i11, 0, blockMode.weightGridWidth*blockMode.weightGridHeight) || w11 == 0);
			for (int texelWeightNdx = 0; texelWeightNdx < numWeightsPerTexel; texelWeightNdx++)
			{
				// & 0x3f clamps address to bounds of unquantizedWeights
				const deUint32 p00	= unquantizedWeights[(i00 * numWeightsPerTexel + texelWeightNdx) & 0x3f];
				const deUint32 p01	= unquantizedWeights[(i01 * numWeightsPerTexel + texelWeightNdx) & 0x3f];
				const deUint32 p10	= unquantizedWeights[(i10 * numWeightsPerTexel + texelWeightNdx) & 0x3f];
				const deUint32 p11	= unquantizedWeights[(i11 * numWeightsPerTexel + texelWeightNdx) & 0x3f];
				dst[texelY*blockWidth + texelX].w[texelWeightNdx] = (p00*w00 + p01*w01 + p10*w10 + p11*w11 + 8) >> 4;
			}
		}
	}
}
void computeTexelWeights (TexelWeightPair* dst, const Block128& blockData, int blockWidth, int blockHeight, const ASTCBlockMode& blockMode)
{
	ISEDecodedResult weightGrid[64];
	{
		BitAccessStream dataStream(blockData, 127, computeNumRequiredBits(blockMode.weightISEParams, computeNumWeights(blockMode)), false);
		decodeISE(&weightGrid[0], computeNumWeights(blockMode), dataStream, blockMode.weightISEParams);
	}
	{
		deUint32 unquantizedWeights[64];
		unquantizeWeights(&unquantizedWeights[0], &weightGrid[0], blockMode);
		interpolateWeights(dst, unquantizedWeights, blockWidth, blockHeight, blockMode);
	}
}
inline deUint32 hash52 (deUint32 v)
{
	deUint32 p = v;
	p ^= p >> 15;	p -= p << 17;	p += p << 7;	p += p << 4;
	p ^= p >>  5;	p += p << 16;	p ^= p >> 7;	p ^= p >> 3;
	p ^= p <<  6;	p ^= p >> 17;
	return p;
}
int computeTexelPartition (deUint32 seedIn, deUint32 xIn, deUint32 yIn, deUint32 zIn, int numPartitions, bool smallBlock)
{
	DE_ASSERT(zIn == 0);
	const deUint32	x		= smallBlock ? xIn << 1 : xIn;
	const deUint32	y		= smallBlock ? yIn << 1 : yIn;
	const deUint32	z		= smallBlock ? zIn << 1 : zIn;
	const deUint32	seed	= seedIn + 1024*(numPartitions-1);
	const deUint32	rnum	= hash52(seed);
	deUint8			seed1	= (deUint8)( rnum							& 0xf);
	deUint8			seed2	= (deUint8)((rnum >>  4)					& 0xf);
	deUint8			seed3	= (deUint8)((rnum >>  8)					& 0xf);
	deUint8			seed4	= (deUint8)((rnum >> 12)					& 0xf);
	deUint8			seed5	= (deUint8)((rnum >> 16)					& 0xf);
	deUint8			seed6	= (deUint8)((rnum >> 20)					& 0xf);
	deUint8			seed7	= (deUint8)((rnum >> 24)					& 0xf);
	deUint8			seed8	= (deUint8)((rnum >> 28)					& 0xf);
	deUint8			seed9	= (deUint8)((rnum >> 18)					& 0xf);
	deUint8			seed10	= (deUint8)((rnum >> 22)					& 0xf);
	deUint8			seed11	= (deUint8)((rnum >> 26)					& 0xf);
	deUint8			seed12	= (deUint8)(((rnum >> 30) | (rnum << 2))	& 0xf);
	seed1  = (deUint8)(seed1  * seed1 );
	seed2  = (deUint8)(seed2  * seed2 );
	seed3  = (deUint8)(seed3  * seed3 );
	seed4  = (deUint8)(seed4  * seed4 );
	seed5  = (deUint8)(seed5  * seed5 );
	seed6  = (deUint8)(seed6  * seed6 );
	seed7  = (deUint8)(seed7  * seed7 );
	seed8  = (deUint8)(seed8  * seed8 );
	seed9  = (deUint8)(seed9  * seed9 );
	seed10 = (deUint8)(seed10 * seed10);
	seed11 = (deUint8)(seed11 * seed11);
	seed12 = (deUint8)(seed12 * seed12);
	const int shA = (seed & 2) != 0		? 4		: 5;
	const int shB = numPartitions == 3	? 6		: 5;
	const int sh1 = (seed & 1) != 0		? shA	: shB;
	const int sh2 = (seed & 1) != 0		? shB	: shA;
	const int sh3 = (seed & 0x10) != 0	? sh1	: sh2;
	seed1  = (deUint8)(seed1  >> sh1);
	seed2  = (deUint8)(seed2  >> sh2);
	seed3  = (deUint8)(seed3  >> sh1);
	seed4  = (deUint8)(seed4  >> sh2);
	seed5  = (deUint8)(seed5  >> sh1);
	seed6  = (deUint8)(seed6  >> sh2);
	seed7  = (deUint8)(seed7  >> sh1);
	seed8  = (deUint8)(seed8  >> sh2);
	seed9  = (deUint8)(seed9  >> sh3);
	seed10 = (deUint8)(seed10 >> sh3);
	seed11 = (deUint8)(seed11 >> sh3);
	seed12 = (deUint8)(seed12 >> sh3);
	const int a =						0x3f & (seed1*x + seed2*y + seed11*z + (rnum >> 14));
	const int b =						0x3f & (seed3*x + seed4*y + seed12*z + (rnum >> 10));
	const int c = numPartitions >= 3 ?	0x3f & (seed5*x + seed6*y + seed9*z  + (rnum >>  6))	: 0;
	const int d = numPartitions >= 4 ?	0x3f & (seed7*x + seed8*y + seed10*z + (rnum >>  2))	: 0;
	return a >= b && a >= c && a >= d	? 0
		 : b >= c && b >= d				? 1
		 : c >= d						? 2
		 :								  3;
}
DecompressResult setTexelColors (void* dst, ColorEndpointPair* colorEndpoints, TexelWeightPair* texelWeights, int ccs, deUint32 partitionIndexSeed,
								 int numPartitions, int blockWidth, int blockHeight, bool isSRGB, bool isLDRMode, const deUint32* colorEndpointModes)
{
	const bool			smallBlock	= blockWidth*blockHeight < 31;
	DecompressResult	result		= DECOMPRESS_RESULT_VALID_BLOCK;
	bool				isHDREndpoint[4];
	for (int i = 0; i < numPartitions; i++)
	{
		isHDREndpoint[i] = isColorEndpointModeHDR(colorEndpointModes[i]);
		
		// rg - REMOVING HDR SUPPORT FOR NOW
		if (isHDREndpoint[i])
			return DECOMPRESS_RESULT_ERROR;
	}

	for (int texelY = 0; texelY < blockHeight; texelY++)
	for (int texelX = 0; texelX < blockWidth; texelX++)
	{
		const int				texelNdx			= texelY*blockWidth + texelX;
		const int				colorEndpointNdx	= numPartitions == 1 ? 0 : computeTexelPartition(partitionIndexSeed, texelX, texelY, 0, numPartitions, smallBlock);
		DE_ASSERT(colorEndpointNdx < numPartitions);
		const UVec4&			e0					= colorEndpoints[colorEndpointNdx].e0;
		const UVec4&			e1					= colorEndpoints[colorEndpointNdx].e1;
		const TexelWeightPair&	weight				= texelWeights[texelNdx];
		if (isLDRMode && isHDREndpoint[colorEndpointNdx])
		{
			if (isSRGB)
			{
				((deUint8*)dst)[texelNdx*4 + 0] = 0xff;
				((deUint8*)dst)[texelNdx*4 + 1] = 0;
				((deUint8*)dst)[texelNdx*4 + 2] = 0xff;
				((deUint8*)dst)[texelNdx*4 + 3] = 0xff;
			}
			else
			{
				((float*)dst)[texelNdx*4 + 0] = 1.0f;
				((float*)dst)[texelNdx*4 + 1] = 0;
				((float*)dst)[texelNdx*4 + 2] = 1.0f;
				((float*)dst)[texelNdx*4 + 3] = 1.0f;
			}
			result = DECOMPRESS_RESULT_ERROR;
		}
		else
		{
			for (int channelNdx = 0; channelNdx < 4; channelNdx++)
			{
				if (!isHDREndpoint[colorEndpointNdx] || (channelNdx == 3 && colorEndpointModes[colorEndpointNdx] == 14)) // \note Alpha for mode 14 is treated the same as LDR.
				{
					const deUint32 c0	= (e0[channelNdx] << 8) | (isSRGB ? 0x80 : e0[channelNdx]);
					const deUint32 c1	= (e1[channelNdx] << 8) | (isSRGB ? 0x80 : e1[channelNdx]);
					const deUint32 w	= weight.w[ccs == channelNdx ? 1 : 0];
					const deUint32 c	= (c0*(64-w) + c1*w + 32) / 64;
					if (isSRGB)
						((deUint8*)dst)[texelNdx*4 + channelNdx] = (deUint8)((c & 0xff00) >> 8);
					else
						((float*)dst)[texelNdx*4 + channelNdx] = c == 65535 ? 1.0f : (float)c / 65536.0f;
				}
				else
				{
					//DE_STATIC_ASSERT((basisu_astc::meta::TypesSame<deFloat16, deUint16>::Value));
					// rg - REMOVING HDR SUPPORT FOR NOW
#if 0
					const deUint32		c0	= e0[channelNdx] << 4;
					const deUint32		c1	= e1[channelNdx] << 4;
					const deUint32		w	= weight.w[ccs == channelNdx ? 1 : 0];
					const deUint32		c	= (c0*(64-w) + c1*w + 32) / 64;
					const deUint32		e	= getBits(c, 11, 15);
					const deUint32		m	= getBits(c, 0, 10);
					const deUint32		mt	= m < 512		? 3*m
											: m >= 1536		? 5*m - 2048
											:				  4*m - 512;
					const deFloat16		cf	= (deFloat16)((e << 10) + (mt >> 3));
					((float*)dst)[texelNdx*4 + channelNdx] = deFloat16To32(isFloat16InfOrNan(cf) ? 0x7bff : cf);
#endif
				}
			}
		}
	}
	return result;
}
DecompressResult decompressBlock (void* dst, const Block128& blockData, int blockWidth, int blockHeight, bool isSRGB, bool isLDR)
{
	DE_ASSERT(isLDR || !isSRGB);
	// Decode block mode.
	const ASTCBlockMode blockMode = getASTCBlockMode(blockData.getBits(0, 10));
	// Check for block mode errors.
	if (blockMode.isError)
	{
		setASTCErrorColorBlock(dst, blockWidth, blockHeight, isSRGB);
		return DECOMPRESS_RESULT_ERROR;
	}
	// Separate path for void-extent.
	if (blockMode.isVoidExtent)
		return decodeVoidExtentBlock(dst, blockData, blockWidth, blockHeight, isSRGB, isLDR);
	// Compute weight grid values.
	const int numWeights			= computeNumWeights(blockMode);
	const int numWeightDataBits		= computeNumRequiredBits(blockMode.weightISEParams, numWeights);
	const int numPartitions			= (int)blockData.getBits(11, 12) + 1;
	// Check for errors in weight grid, partition and dual-plane parameters.
	if (numWeights > 64								||
		numWeightDataBits > 96						||
		numWeightDataBits < 24						||
		blockMode.weightGridWidth > blockWidth		||
		blockMode.weightGridHeight > blockHeight	||
		(numPartitions == 4 && blockMode.isDualPlane))
	{
		setASTCErrorColorBlock(dst, blockWidth, blockHeight, isSRGB);
		return DECOMPRESS_RESULT_ERROR;
	}
	// Compute number of bits available for color endpoint data.
	const bool	isSingleUniqueCem			= numPartitions == 1 || blockData.getBits(23, 24) == 0;
	const int	numConfigDataBits			= (numPartitions == 1 ? 17 : isSingleUniqueCem ? 29 : 25 + 3*numPartitions) +
											  (blockMode.isDualPlane ? 2 : 0);
	const int	numBitsForColorEndpoints	= 128 - numWeightDataBits - numConfigDataBits;
	const int	extraCemBitsStart			= 127 - numWeightDataBits - (isSingleUniqueCem		? -1
																		: numPartitions == 4	? 7
																		: numPartitions == 3	? 4
																		: numPartitions == 2	? 1
																		: 0);
	// Decode color endpoint modes.
	deUint32 colorEndpointModes[4];
	decodeColorEndpointModes(&colorEndpointModes[0], blockData, numPartitions, extraCemBitsStart);
	const int numColorEndpointValues = computeNumColorEndpointValues(colorEndpointModes, numPartitions);
	// Check for errors in color endpoint value count.
	if (numColorEndpointValues > 18 || numBitsForColorEndpoints < (int)deDivRoundUp32(13*numColorEndpointValues, 5))
	{
		setASTCErrorColorBlock(dst, blockWidth, blockHeight, isSRGB);
		return DECOMPRESS_RESULT_ERROR;
	}
	// Compute color endpoints.
	ColorEndpointPair colorEndpoints[4];
	computeColorEndpoints(&colorEndpoints[0], blockData, &colorEndpointModes[0], numPartitions, numColorEndpointValues,
						  computeMaximumRangeISEParams(numBitsForColorEndpoints, numColorEndpointValues), numBitsForColorEndpoints);
	// Compute texel weights.
	TexelWeightPair texelWeights[MAX_BLOCK_WIDTH*MAX_BLOCK_HEIGHT];
	computeTexelWeights(&texelWeights[0], blockData, blockWidth, blockHeight, blockMode);
	// Set texel colors.
	const int		ccs						= blockMode.isDualPlane ? (int)blockData.getBits(extraCemBitsStart-2, extraCemBitsStart-1) : -1;
	const deUint32	partitionIndexSeed		= numPartitions > 1 ? blockData.getBits(13, 22) : (deUint32)-1;
	return setTexelColors(dst, &colorEndpoints[0], &texelWeights[0], ccs, partitionIndexSeed, numPartitions, blockWidth, blockHeight, isSRGB, isLDR, &colorEndpointModes[0]);
}

} // anonymous

bool decompress(uint8_t *pDst, const uint8_t * data, bool isSRGB, int blockWidth, int blockHeight)
{
	// rg - We only support LDR here, although adding back in HDR would be easy.
	const bool isLDR = true;
	DE_ASSERT(isLDR || !isSRGB);
	
	float linear[MAX_BLOCK_WIDTH * MAX_BLOCK_HEIGHT * 4];

	const Block128 blockData(data);
	if (decompressBlock(isSRGB ? (void*)pDst : (void*)& linear[0],
		blockData, blockWidth, blockHeight, isSRGB, isLDR) != DECOMPRESS_RESULT_VALID_BLOCK)
		return false;
	
	if (!isSRGB)
	{
		int pix = 0;
		for (int i = 0; i < blockHeight; i++)
		{
			for (int j = 0; j < blockWidth; j++, pix++)
			{
				pDst[4 * pix + 0] = (uint8_t)(basisu_astc::clamp<int>((int)(linear[pix * 4 + 0] * 65536.0f + .5f), 0, 65535) >> 8);
				pDst[4 * pix + 1] = (uint8_t)(basisu_astc::clamp<int>((int)(linear[pix * 4 + 1] * 65536.0f + .5f), 0, 65535) >> 8);
				pDst[4 * pix + 2] = (uint8_t)(basisu_astc::clamp<int>((int)(linear[pix * 4 + 2] * 65536.0f + .5f), 0, 65535) >> 8);
				pDst[4 * pix + 3] = (uint8_t)(basisu_astc::clamp<int>((int)(linear[pix * 4 + 3] * 65536.0f + .5f), 0, 65535) >> 8);
			}
		}
	}

	return true;
}

} // astc
} // basisu_astc