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basisu_astc_decomp.cpp
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basisu_astc_decomp.cpp
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// 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());
}