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client/EterImageLib/DXTCImage.cpp

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// need the d3d.h for things in format of .dds file
#include "StdAfx.h"
#include <d3d.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "../eterBase/MappedFile.h"
#include "../eterBase/Debug.h"
#include "DXTCImage.h"
struct DXTColBlock
{
WORD col0;
WORD col1;
// no bit fields - use bytes
BYTE row[4];
};
struct DXTAlphaBlockExplicit
{
WORD row[4];
};
struct DXTAlphaBlock3BitLinear
{
BYTE alpha0;
BYTE alpha1;
BYTE stuff[6];
};
// use cast to struct instead of RGBA_MAKE as struct is much
struct Color8888
{
BYTE b; // Last one is MSB, 1st is LSB.
BYTE g; // order of the output ARGB or BGRA, etc...
BYTE r; // change the order of names to change the
BYTE a;
};
struct Color565
{
unsigned nBlue : 5; // order of names changes
unsigned nGreen : 6; // byte order of output to 32 bit
unsigned nRed : 5;
};
/////////////////////////////////////
// should be in ddraw.h
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((DWORD)(BYTE) (ch0 ) | ((DWORD)(BYTE) (ch1) << 8) | \
((DWORD)(BYTE) (ch2) << 16) | ((DWORD)(BYTE) (ch3) << 24))
#endif // defined(MAKEFOURCC)
CDXTCImage::CDXTCImage()
{
Initialize();
}
CDXTCImage::~CDXTCImage()
{
}
void CDXTCImage::Initialize()
{
m_nWidth = 0;
m_nHeight = 0;
for (int i = 0; i < MAX_MIPLEVELS; ++i)
m_pbCompBufferByLevels[i] = NULL;
}
void CDXTCImage::Clear()
{
for (int i = 0; i < MAX_MIPLEVELS; ++i)
m_bCompVector[i].clear();
Initialize();
}
bool CDXTCImage::LoadFromFile(const char * filename)
{
// only understands .dds files for now
// return true if success
char * exts[] = { ".DDS" };
int next = 1;
static char fileupper[MAX_PATH+1];
strncpy(fileupper, filename, MAX_PATH);
strupr(fileupper);
int i;
bool knownformat = false;
for (i = 0; i < next; ++i)
{
char * found = strstr(fileupper, exts[0]);
if (found != NULL)
{
knownformat = true;
break;
}
}
if (knownformat == false)
{
Tracef("Unknown file format encountered! [%s]\n", filename);
return(false);
}
CMappedFile mappedFile;
LPCVOID pvMap;
if (!mappedFile.Create(filename, &pvMap, 0, 0))
{
Tracef("Can't open file for reading! [%s]\n", filename);
return false;
}
return LoadFromMemory((const BYTE*) pvMap);
}
bool CDXTCImage::LoadHeaderFromMemory(const BYTE * c_pbMap)
{
//////////////////////////////////////
// start reading the file
// from Microsoft's mssdk D3DIM example "Compress"
DWORD dwMagic;
// Read magic number
dwMagic = *(DWORD *) c_pbMap;
c_pbMap += sizeof(DWORD);
//!@#
// if (dwMagic != MAKEFOURCC('D','D','S',' '))
// return false;
DDSURFACEDESC2 ddsd; // read from dds file
// Read the surface description
memcpy(&ddsd, c_pbMap, sizeof(DDSURFACEDESC2));
c_pbMap += sizeof(DDSURFACEDESC2);
// Does texture have mipmaps?
m_bMipTexture = (ddsd.dwMipMapCount > 0) ? TRUE : FALSE;
// Clear unwanted flags
// Can't do this!!! surface not re-created here
// ddsd.dwFlags &= (~DDSD_PITCH);
// ddsd.dwFlags &= (~DDSD_LINEARSIZE);
// Is it DXTC ?
// I sure hope pixelformat is valid!
m_xddPixelFormat.dwFlags = ddsd.ddpfPixelFormat.dwFlags;
m_xddPixelFormat.dwFourCC = ddsd.ddpfPixelFormat.dwFourCC;
m_xddPixelFormat.dwSize = ddsd.ddpfPixelFormat.dwSize;
m_xddPixelFormat.dwRGBBitCount = ddsd.ddpfPixelFormat.dwRGBBitCount;
m_xddPixelFormat.dwRGBAlphaBitMask = ddsd.ddpfPixelFormat.dwRGBAlphaBitMask;
m_xddPixelFormat.dwRBitMask = ddsd.ddpfPixelFormat.dwRBitMask;
m_xddPixelFormat.dwGBitMask = ddsd.ddpfPixelFormat.dwGBitMask;
m_xddPixelFormat.dwBBitMask = ddsd.ddpfPixelFormat.dwBBitMask;
DecodePixelFormat(m_strFormat, &m_xddPixelFormat);
if (m_CompFormat != PF_DXT1 &&
m_CompFormat != PF_DXT3 &&
m_CompFormat != PF_DXT5)
{
return false;
}
if (ddsd.dwMipMapCount > MAX_MIPLEVELS)
ddsd.dwMipMapCount = MAX_MIPLEVELS;
m_nWidth = ddsd.dwWidth;
m_nHeight = ddsd.dwHeight;
//!@#
m_dwMipMapCount = max(1, ddsd.dwMipMapCount);
m_dwFlags = ddsd.dwFlags;
if (ddsd.dwFlags & DDSD_PITCH)
{
m_lPitch = ddsd.lPitch;
m_pbCompBufferByLevels[0] = c_pbMap;
}
else
{
m_lPitch = ddsd.dwLinearSize;
if (ddsd.dwFlags & DDSD_MIPMAPCOUNT)
{
for (DWORD dwLinearSize = ddsd.dwLinearSize, i = 0; i < m_dwMipMapCount; ++i, dwLinearSize >>= 2)
{
m_pbCompBufferByLevels[i] = c_pbMap;
c_pbMap += dwLinearSize;
}
}
else
{
m_pbCompBufferByLevels[0] = c_pbMap;
}
}
return true;
}
//////////////////////////////////////////////////////////////////////
bool CDXTCImage::LoadFromMemory(const BYTE * c_pbMap)
{
if (!LoadHeaderFromMemory(c_pbMap))
return false;
if (m_dwFlags & DDSD_PITCH)
{
DWORD dwBytesPerRow = m_nWidth * m_xddPixelFormat.dwRGBBitCount / 8;
m_nCompSize = m_lPitch * m_nHeight;
m_nCompLineSz = dwBytesPerRow;
m_bCompVector[0].resize(m_nCompSize);
BYTE * pDest = &m_bCompVector[0][0];
c_pbMap = m_pbCompBufferByLevels[0];
for (int yp = 0; yp < m_nHeight; ++yp)
{
memcpy(pDest, c_pbMap, dwBytesPerRow);
pDest += m_lPitch;
c_pbMap += m_lPitch;
}
}
else
{
if (m_dwFlags & DDSD_MIPMAPCOUNT)
{
for (DWORD dwLinearSize = m_lPitch, i = 0; i < m_dwMipMapCount; ++i, dwLinearSize >>= 2)
{
m_bCompVector[i].resize(dwLinearSize);
Copy(i, &m_bCompVector[i][0], dwLinearSize);
}
}
else
{
m_bCompVector[0].resize(m_lPitch);
Copy(0, &m_bCompVector[0][0], m_lPitch);
}
}
// done reading file
return true;
}
bool CDXTCImage::Copy(int miplevel, BYTE * pbDest, long lDestPitch)
{
if (!(m_dwFlags & DDSD_MIPMAPCOUNT))
if (miplevel)
return false;
/*
DXTColBlock * pBlock;
WORD * pPos = (WORD *) &m_pbCompBufferByLevels[miplevel][0];
int xblocks = (m_nWidth >> miplevel) / 4;
int yblocks = (m_nHeight >> miplevel) / 4;
for (int y = 0; y < yblocks; ++y)
{
// 8 bytes per block
pBlock = (DXTColBlock*) ((DWORD) pPos + y * xblocks * 8);
memcpy(pbDest, pBlock, xblocks * 8);
pbDest += lDestPitch;
}
*/
memcpy(pbDest, m_pbCompBufferByLevels[miplevel], m_lPitch >> (miplevel * 2));
pbDest += lDestPitch;
return true;
}
void CDXTCImage::Unextract(BYTE * pbDest, int /*iWidth*/, int /*iHeight*/, int iPitch)
{
if (!m_pbCompBufferByLevels[0])
return;
DXTColBlock * pBlock;
BYTE * pPos = (BYTE *) &m_pbCompBufferByLevels[0][0];
int xblocks = m_nWidth / 4;
int yblocks = (m_nHeight / 4) * ((iPitch / m_nWidth) / 2);
for (int y = 0; y < yblocks; ++y)
{
pBlock = (DXTColBlock*) (pPos + y * xblocks * 8);
memcpy(pbDest, pBlock, xblocks * 8);
pbDest += xblocks * 8;
}
/*
for (int y = 0; y < iHeight; ++y)
{
memcpy(pbDest, &m_pbCompBufferByLevels[0][0] + y*iWidth, iWidth);
pbDest += iWidth;
}
*/
}
void CDXTCImage::Decompress(int miplevel, DWORD * pdwDest)
{
switch (m_CompFormat)
{
case PF_DXT1:
DecompressDXT1(miplevel, pdwDest);
break;
case PF_DXT3:
DecompressDXT3(miplevel, pdwDest);
break;
case PF_DXT5:
DecompressDXT5(miplevel, pdwDest);
break;
case PF_ARGB:
DecompressARGB(miplevel, pdwDest);
break;
case PF_UNKNOWN:
break;
}
}
inline void GetColorBlockColors(DXTColBlock * pBlock, Color8888 * col_0, Color8888 * col_1,
Color8888 * col_2, Color8888 * col_3,
WORD & wrd)
{
// There are 4 methods to use - see the Time_ functions.
// 1st = shift = does normal approach per byte for color comps
// 2nd = use freak variable bit field color565 for component extraction
// 3rd = use super-freak DWORD adds BEFORE shifting the color components
// This lets you do only 1 add per color instead of 3 BYTE adds and
// might be faster
// Call RunTimingSession() to run each of them & output result to txt file
// freak variable bit structure method
// normal math
// This method is fastest
Color565 * pCol;
pCol = (Color565*) & (pBlock->col0);
col_0->a = 0xff;
col_0->r = pCol->nRed;
col_0->r <<= 3; // shift to full precision
col_0->g = pCol->nGreen;
col_0->g <<= 2;
col_0->b = pCol->nBlue;
col_0->b <<= 3;
pCol = (Color565*) & (pBlock->col1);
col_1->a = 0xff;
col_1->r = pCol->nRed;
col_1->r <<= 3; // shift to full precision
col_1->g = pCol->nGreen;
col_1->g <<= 2;
col_1->b = pCol->nBlue;
col_1->b <<= 3;
if (pBlock->col0 > pBlock->col1)
{
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
wrd = (WORD) (((WORD) col_0->r * 2 + (WORD) col_1->r) / 3);
// no +1 for rounding
// as bits have been shifted to 888
col_2->r = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->g * 2 + (WORD) col_1->g) / 3);
col_2->g = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->b * 2 + (WORD) col_1->b) / 3);
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
wrd = (WORD) (((WORD) col_0->r + (WORD) col_1->r * 2) / 3);
col_3->r = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->g + (WORD) col_1->g * 2) / 3);
col_3->g = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->b + (WORD) col_1->b * 2) / 3);
col_3->b = (BYTE)wrd;
col_3->a = 0xff;
}
else
{
// Three-color block: derive the other color.
// 00 = color_0, 01 = color_1, 10 = color_2,
// 11 = transparent.
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
// explicit for each component, unlike some refrasts...
// Tracef("block has alpha\n");
wrd = (WORD) (((WORD) col_0->r + (WORD) col_1->r) / 2);
col_2->r = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->g + (WORD) col_1->g) / 2);
col_2->g = (BYTE)wrd;
wrd = (WORD) (((WORD) col_0->b + (WORD) col_1->b) / 2);
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
col_3->r = 0x00; // random color to indicate alpha
col_3->g = 0x00;
col_3->b = 0x00;
col_3->a = 0x00;
}
} // Get color block colors (...)
inline void DecodeColorBlock(DWORD * pImPos,
DXTColBlock * pColorBlock,
int width,
DWORD * col_0,
DWORD * col_1,
DWORD * col_2,
DWORD * col_3)
{
// width is width of image in pixels
DWORD bits;
int y, n;
// bit masks = 00000011, 00001100, 00110000, 11000000
const DWORD masks[] = { 3, 12, 3 << 4, 3 << 6 };
const int shift[] = { 0, 2, 4, 6 };
// r steps through lines in y
for (y = 0; y < 4; ++y, pImPos += width - 4) // no width * 4 as DWORD ptr inc will * 4
{
// width * 4 bytes per pixel per line
// each j dxtc row is 4 lines of pixels
// pImPos = (DWORD*) ((DWORD) pBase + i * 16 + (y + j * 4) * m_nWidth * 4);
// n steps through pixels
for (n = 0; n < 4; ++n)
{
bits = pColorBlock->row[y] & masks[n];
bits >>= shift[n];
switch (bits)
{
case 0:
*pImPos = *col_0;
pImPos++; // increment to next DWORD
break;
case 1:
*pImPos = *col_1;
pImPos++;
break;
case 2:
*pImPos = *col_2;
pImPos++;
break;
case 3:
*pImPos = *col_3;
pImPos++;
break;
default:
Tracef("Your logic is jacked! bits == 0x%x\n", bits);
pImPos++;
break;
}
}
}
}
inline void DecodeAlphaExplicit(DWORD * pImPos, DXTAlphaBlockExplicit * pAlphaBlock,
int width, DWORD alphazero)
{
// alphazero is a bit mask that when & with the image color
// will zero the alpha bits, so if the image DWORDs are
// ARGB then alphazero will be 0x00ffffff or if
// RGBA then alphazero will be 0xffffff00
// alphazero constructed automaticaly from field order of Color8888 structure
// decodes to 32 bit format only
int row, pix;
WORD wrd;
Color8888 col;
col.r = col.g = col.b = 0;
//Tracef("\n");
for (row = 0; row < 4; row++, pImPos += width - 4)
{
// pImPow += pImPos += width-4 moves to next row down
wrd = pAlphaBlock->row[row];
// Tracef("0x%.8x\t\t", wrd);
for (pix = 0; pix < 4; ++pix)
{
// zero the alpha bits of image pixel
*pImPos &= alphazero;
col.a = (BYTE) (wrd & 0x000f); // get only low 4 bits
// col.a <<= 4; // shift to full byte precision
// NOTE: with just a << 4 you'll never have alpha
// of 0xff, 0xf0 is max so pure shift doesn't quite
// cover full alpha range.
// It's much cheaper than divide & scale though.
// To correct for this, and get 0xff for max alpha,
// or the low bits back in after left shifting
col.a = (BYTE) (col.a | (col.a << 4)); // This allows max 4 bit alpha to be 0xff alpha
// in final image, and is crude approach to full
// range scale
*pImPos |= *((DWORD*)&col); // or the bits into the prev. nulled alpha
wrd >>= 4; // move next bits to lowest 4
pImPos++; // move to next pixel in the row
}
}
}
static BYTE gBits[4][4];
static WORD gAlphas[8];
static Color8888 gACol[4][4];
inline void DecodeAlpha3BitLinear(DWORD * pImPos, DXTAlphaBlock3BitLinear * pAlphaBlock,
int width, DWORD alphazero)
{
gAlphas[0] = pAlphaBlock->alpha0;
gAlphas[1] = pAlphaBlock->alpha1;
// 8-alpha or 6-alpha block?
if (gAlphas[0] > gAlphas[1])
{
// 8-alpha block: derive the other 6 alphas.
// 000 = alpha_0, 001 = alpha_1, others are interpolated
gAlphas[2] = (WORD) ((6 * gAlphas[0] + gAlphas[1]) / 7); // Bit code 010
gAlphas[3] = (WORD) ((5 * gAlphas[0] + 2 * gAlphas[1]) / 7); // Bit code 011
gAlphas[4] = (WORD) ((4 * gAlphas[0] + 3 * gAlphas[1]) / 7); // Bit code 100
gAlphas[5] = (WORD) ((3 * gAlphas[0] + 4 * gAlphas[1]) / 7); // Bit code 101
gAlphas[6] = (WORD) ((2 * gAlphas[0] + 5 * gAlphas[1]) / 7); // Bit code 110
gAlphas[7] = (WORD) (( gAlphas[0] + 6 * gAlphas[1]) / 7); // Bit code 111
}
else
{
// 6-alpha block: derive the other alphas.
// 000 = alpha_0, 001 = alpha_1, others are interpolated
gAlphas[2] = (WORD) ((4 * gAlphas[0] + gAlphas[1]) / 5); // Bit code 010
gAlphas[3] = (WORD) ((3 * gAlphas[0] + 2 * gAlphas[1]) / 5); // Bit code 011
gAlphas[4] = (WORD) ((2 * gAlphas[0] + 3 * gAlphas[1]) / 5); // Bit code 100
gAlphas[5] = (WORD) (( gAlphas[0] + 4 * gAlphas[1]) / 5); // Bit code 101
gAlphas[6] = 0; // Bit code 110
gAlphas[7] = 255; // Bit code 111
}
// Decode 3-bit fields into array of 16 BYTES with same value
// first two rows of 4 pixels each:
// pRows = (Alpha3BitRows*) & (pAlphaBlock->stuff[0]);
const DWORD mask = 0x00000007; // bits = 00 00 01 11
DWORD bits = *((DWORD*) & (pAlphaBlock->stuff[0]));
gBits[0][0] = (BYTE) (bits & mask);
bits >>= 3;
gBits[0][1] = (BYTE) (bits & mask);
bits >>= 3;
gBits[0][2] = (BYTE) (bits & mask);
bits >>= 3;
gBits[0][3] = (BYTE) (bits & mask);
bits >>= 3;
gBits[1][0] = (BYTE) (bits & mask);
bits >>= 3;
gBits[1][1] = (BYTE) (bits & mask);
bits >>= 3;
gBits[1][2] = (BYTE) (bits & mask);
bits >>= 3;
gBits[1][3] = (BYTE) (bits & mask);
// now for last two rows:
bits = *((DWORD*) & (pAlphaBlock->stuff[3])); // last 3 bytes
gBits[2][0] = (BYTE) (bits & mask);
bits >>= 3;
gBits[2][1] = (BYTE) (bits & mask);
bits >>= 3;
gBits[2][2] = (BYTE) (bits & mask);
bits >>= 3;
gBits[2][3] = (BYTE) (bits & mask);
bits >>= 3;
gBits[3][0] = (BYTE) (bits & mask);
bits >>= 3;
gBits[3][1] = (BYTE) (bits & mask);
bits >>= 3;
gBits[3][2] = (BYTE) (bits & mask);
bits >>= 3;
gBits[3][3] = (BYTE) (bits & mask);
// decode the codes into alpha values
int row, pix;
for (row = 0; row < 4; ++row)
{
for (pix = 0; pix < 4; ++pix)
{
gACol[row][pix].a = (BYTE) gAlphas[gBits[row][pix]];
assert(gACol[row][pix].r == 0);
assert(gACol[row][pix].g == 0);
assert(gACol[row][pix].b == 0);
}
}
// Write out alpha values to the image bits
for (row = 0; row < 4; ++row, pImPos += width - 4)
{
// pImPow += pImPos += width - 4 moves to next row down
for (pix = 0; pix < 4; ++pix)
{
// zero the alpha bits of image pixel
*pImPos &= alphazero;
*pImPos |= *((DWORD*) &(gACol[row][pix])); // or the bits into the prev. nulled alpha
pImPos++;
}
}
}
void CDXTCImage::DecompressDXT1(int miplevel, DWORD * pdwDest)
{
// This was hacked up pretty quick & slopily
// decompresses to 32 bit format 0xARGB
int xblocks, yblocks;
#ifdef DEBUG
if ((ddsd.dwWidth % 4) != 0)
{
Tracef("****** warning width not div by 4! %d\n", ddsd.dwWidth);
}
if ((ddsd.dwHeight % 4) != 0)
{
Tracef("****** warning Height not div by 4! %d\n", ddsd.dwHeight);
}
Tracef("end check\n");
#endif
UINT nWidth = m_nWidth >> miplevel;
UINT nHeight = m_nHeight >> miplevel;
xblocks = nWidth / 4;
yblocks = nHeight / 4;
int x, y;
DWORD * pBase = (DWORD *) pdwDest;
WORD * pPos = (WORD *) &m_bCompVector[miplevel][0];; // pos in compressed data
DWORD * pImPos;
DXTColBlock * pBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
for (y = 0; y < yblocks; ++y)
{
// 8 bytes per block
pBlock = (DXTColBlock *) ((DWORD) pPos + y * xblocks * 8);
for (x = 0; x < xblocks; ++x, ++pBlock)
{
// inline func:
GetColorBlockColors(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
pImPos = (DWORD *) ((DWORD) pBase + x*16 + (y*4) * nWidth * 4);
DecodeColorBlock(pImPos, pBlock, nWidth, (DWORD *)&col_0, (DWORD *)&col_1, (DWORD *)&col_2, (DWORD *)&col_3);
// Set to RGB test pattern
// pImPos = (DWORD*) ((DWORD) pBase + i * 4 + j * m_nWidth * 4);
// *pImPos = ((i * 4) << 16) | ((j * 4) << 8) | ((63 - i) * 4);
// checkerboard of only col_0 and col_1 basis colors:
// pImPos = (DWORD *) ((DWORD) pBase + i * 8 + j * m_nWidth * 8);
// *pImPos = *((DWORD *) &col_0);
// pImPos += 1 + m_nWidth;
// *pImPos = *((DWORD *) &col_1);
}
}
}
void CDXTCImage::DecompressDXT3(int miplevel, DWORD* pdwDest)
{
int xblocks, yblocks;
#ifdef DEBUG
if ((ddsd.dwWidth % 4) != 0)
{
Tracef("****** warning width not div by 4! %d\n", ddsd.dwWidth);
}
if ((ddsd.dwHeight % 4) != 0)
{
Tracef("****** warning Height not div by 4! %d\n", ddsd.dwHeight);
}
Tracef("end check\n");
#endif
UINT nWidth = m_nWidth >> miplevel;
UINT nHeight = m_nHeight >> miplevel;
xblocks = nWidth / 4;
yblocks = nHeight / 4;
int x, y;
DWORD * pBase = (DWORD *) pdwDest;
WORD * pPos = (WORD *) &m_bCompVector[miplevel][0]; // pos in compressed data
DWORD * pImPos; // pos in decompressed data
DXTColBlock * pBlock;
DXTAlphaBlockExplicit * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD *) &col_0);
for (y = 0; y < yblocks; ++y)
{
// 8 bytes per block
// 1 block for alpha, 1 block for color
pBlock = (DXTColBlock *) ((DWORD) (pPos + y * xblocks * 16));
for (x = 0; x < xblocks; ++x, ++pBlock)
{
// inline
// Get alpha block
pAlphaBlock = (DXTAlphaBlockExplicit *) pBlock;
// inline func:
// Get color block & colors
pBlock++;
GetColorBlockColors(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
// Decode the color block into the bitmap bits
// inline func:
pImPos = (DWORD *) ((DWORD) (pBase + x * 16 + (y * 4) * nWidth * 4));
DecodeColorBlock(pImPos,
pBlock,
nWidth,
(DWORD *) &col_0, (DWORD *) &col_1, (DWORD *) &col_2, (DWORD *) &col_3);
// Overwrite the previous alpha bits with the alpha block
// info
// inline func:
DecodeAlphaExplicit(pImPos, pAlphaBlock, nWidth, alphazero);
}
}
}
void CDXTCImage::DecompressDXT5(int level, DWORD * pdwDest)
{
int xblocks, yblocks;
#ifdef DEBUG
if ((ddsd.dwWidth % 4) != 0)
{
Tracef("****** warning width not div by 4! %d\n", ddsd.dwWidth);
}
if ((ddsd.dwHeight % 4) != 0)
{
Tracef("****** warning Height not div by 4! %d\n", ddsd.dwHeight);
}
Tracef("end check\n");
#endif
UINT nWidth = m_nWidth >> level;
UINT nHeight = m_nHeight >> level;
xblocks = nWidth / 4;
yblocks = nHeight / 4;
int x, y;
DWORD * pBase = (DWORD *) pdwDest;
WORD * pPos = pPos = (WORD *) &m_bCompVector[level][0]; // pos in compressed data
DWORD * pImPos; // pos in decompressed data
DXTColBlock * pBlock;
DXTAlphaBlock3BitLinear * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD *) &col_0);
////////////////////////////////
// Tracef("blocks: x: %d y: %d\n", xblocks, yblocks);
for (y = 0; y < yblocks; ++y)
{
// 8 bytes per block
// 1 block for alpha, 1 block for color
pBlock = (DXTColBlock*) ((DWORD) (pPos + y * xblocks * 16));
for (x = 0; x < xblocks; ++x, ++pBlock)
{
// inline
// Get alpha block
pAlphaBlock = (DXTAlphaBlock3BitLinear*) pBlock;
// inline func:
// Get color block & colors
pBlock++;
// Tracef("pBlock: 0x%.8x\n", pBlock);
GetColorBlockColors(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
// Decode the color block into the bitmap bits
// inline func:
pImPos = (DWORD *) ((DWORD) (pBase + x * 16 + (y * 4) * nWidth * 4));
//DecodeColorBlock(pImPos, pBlock, nWidth, (DWORD *)&col_0, (DWORD *)&col_1, (DWORD *)&col_2, (DWORD *)&col_3);
DecodeColorBlock(pImPos, pBlock, nWidth, (DWORD *)&col_0, (DWORD *)&col_1, (DWORD *)&col_2, (DWORD *)&col_3);
// Overwrite the previous alpha bits with the alpha block
// info
DecodeAlpha3BitLinear(pImPos, pAlphaBlock, nWidth, alphazero);
}
}
} // dxt5
void CDXTCImage::DecompressARGB(int level, DWORD * pdwDest)
{
UINT lPitch = m_lPitch >> (level * 2);
memcpy(pdwDest, &m_bCompVector[level][0], lPitch);
}
/*
typedef struct _DDSURFACEDESC2 {
DWORD dwSize;
DWORD dwFlags;
DWORD dwHeight;
DWORD dwWidth;
union
{
LONG lPitch;
DWORD dwLinearSize;
} DUMMYUNIONNAMEN(1);
DWORD dwBackBufferCount;
union
{
DWORD dwMipMapCount;
DWORD dwRefreshRate;
} DUMMYUNIONNAMEN(2);
DWORD dwAlphaBitDepth;
DWORD dwReserved;
LPVOID lpSurface;
union
{
DDCOLORKEY ddckCKDestOverlay;
DWORD dwEmptyFaceColor;
} DUMMYUNIONNAMEN(3);
DDCOLORKEY ddckCKDestBlt;
DDCOLORKEY ddckCKSrcOverlay;
DDCOLORKEY ddckCKSrcBlt;
DDPIXELFORMAT ddpfPixelFormat;
DDSCAPS2 ddsCaps;
DWORD dwTextureStage;
} DDSURFACEDESC2, FAR* LPDDSURFACEDESC2;
*/
//-----------------------------------------------------------------------------
// Name: GetNumberOfBits()
// Desc: Returns the number of bits set in a DWORD mask
// from microsoft mssdk d3dim sample "Compress"
//-----------------------------------------------------------------------------
static WORD GetNumberOfBits(DWORD dwMask)
{
WORD wBits;
for (wBits = 0; dwMask; wBits++)
dwMask = (dwMask & (dwMask - 1));
return wBits;
}
//-----------------------------------------------------------------------------
// Name: PixelFormatToString()
// Desc: Creates a string describing a pixel format.
// adapted from microsoft mssdk D3DIM Compress example
// PixelFormatToString()
//-----------------------------------------------------------------------------
VOID CDXTCImage::DecodePixelFormat(CHAR* strPixelFormat, XDDPIXELFORMAT* pxddpf)
{
switch (pxddpf->dwFourCC)
{
case 0:
{
// This dds texture isn't compressed so write out ARGB format
WORD a = GetNumberOfBits(pxddpf->dwRGBAlphaBitMask);
WORD r = GetNumberOfBits(pxddpf->dwRBitMask);
WORD g = GetNumberOfBits(pxddpf->dwGBitMask);
WORD b = GetNumberOfBits(pxddpf->dwBBitMask);
_snprintf(strPixelFormat, 31, "ARGB-%d%d%d%d%s", a, r, g, b,
pxddpf->dwBBitMask & DDPF_ALPHAPREMULT ? "-premul" : "");
m_CompFormat = PF_ARGB;
}
break;
case MAKEFOURCC('D','X','T','1'):
strncpy(strPixelFormat, "DXT1", 31);
m_CompFormat = PF_DXT1;
break;
case MAKEFOURCC('D','X','T','2'):
strncpy(strPixelFormat, "DXT2", 31);
m_CompFormat = PF_DXT2;
break;
case MAKEFOURCC('D','X','T','3'):
strncpy(strPixelFormat, "DXT3", 31);
m_CompFormat = PF_DXT3;
break;
case MAKEFOURCC('D','X','T','4'):
strncpy(strPixelFormat, "DXT4", 31);
m_CompFormat = PF_DXT4;
break;
case MAKEFOURCC('D','X','T','5'):
strncpy(strPixelFormat, "DXT5", 31);
m_CompFormat = PF_DXT5;
break;
default:
strcpy(strPixelFormat, "Format Unknown");
m_CompFormat = PF_UNKNOWN;
break;
}
}
/*
// Struct to hold various timing values
struct TimingInfo
{
LARGE_INTEGER m_start_clk;
LARGE_INTEGER m_end_clk;
int m_nSamples;
LARGE_INTEGER m_interval_sum; // sum of all end-start, nSamples number added in
CString m_csName; // text desc of what timed
};
void CDXTCImage::RunTimingSession()
{
// Must have a dxt5 texture loaded
// No special reason - just lazy coding
// Functions called to time code are separate from non-timed
// code. It's alogorithm that counts.
ASSERT(m_pCompBytes != NULL);
ASSERT(m_pDecompBytes != NULL); // must already have allocated memory
switch (m_CompFormat)
{
case PF_DXT1:
case PF_DXT2:
case PF_DXT3:
case PF_DXT4:
case PF_UNKNOWN:
Tracef("You must have a DXT5 texture loaded to RunTimingSession()!!\n");
Tracef("Now I will be nasty and ASSERT(false)!\n");
ASSERT(false);
break;
case PF_DXT5:
Tracef("Running code timing session on DXT5 color decompress\n");
break;
}
LARGE_INTEGER start_clk, end_clk;
QueryPerformanceCounter(&start_clk);
#define NMETHOD 4
#define NBATCHES 4
int passes[NBATCHES];
passes[0] = 1;
passes[1] = 10;
passes[2] = 30;
passes[3] = 50;
TimingInfo method[NMETHOD][NBATCHES];
int i, n;
FILE * pf = fopen("timing.txt", "wt");
if (pf == NULL)
{
return;
}
fprintf(pf, "\n\n");
for (i = 0; i < NBATCHES; ++i)
{
Sleep(50);
fprintf(pf,"i: %d passes[i]: %d\n", i, passes[i]);
Time_Decomp5_01(passes[i], &(method[0][i]));
Time_Decomp5_02(passes[i], &(method[1][i]));
Time_Decomp5_03(passes[i], &(method[2][i]));
Time_Decomp5_04(passes[i], &(method[3][i]));
}
QueryPerformanceCounter(&end_clk);
// unsigned long total;
// total = (unsigned long) (end_clk - start_clk);
LARGE_INTEGER freq;
QueryPerformanceFrequency(& freq);
fprintf(pf, "\nCounter freq = %u %d \n", freq.LowPart, freq.HighPart);
fprintf(pf, "start: %u %u end: %u %u\n", start_clk.LowPart, start_clk.HighPart, end_clk.LowPart, end_clk.HighPart);
Tracef("\nCounter freq = %u %d \n", freq.LowPart, freq.HighPart);
Tracef("start: %u %u end: %u %u\n", start_clk.LowPart, start_clk.HighPart, end_clk.LowPart, end_clk.HighPart);
double dur = ((double)end_clk.LowPart - (double)start_clk.LowPart) / (double)freq.LowPart;
fprintf(pf, "Total timing session took: %u cycles = %f seconds\n", (end_clk.LowPart - start_clk.LowPart), dur);
fprintf(pf, "\n\n");
Tracef("Total timing session took: %u cycles = %f seconds\n", (end_clk.LowPart - start_clk.LowPart), dur);
Tracef("\n\n");
for (n = 0; n < NMETHOD; ++n)
{
for (i = 0; i < NBATCHES; ++i)
{
fprintf(pf, "method %d:\n", n);
fprintf(pf, " %s", method[n][i].m_csName);
fprintf(pf, " tot: %u %u\n", method[n][i].m_interval_sum.HighPart, method[n][i].m_interval_sum.LowPart);
Tracef("method %d:\n", n);
Tracef(" %s", method[n][i].m_csName);
Tracef(" tot: %u %u\n", method[n][i].m_interval_sum.HighPart, method[n][i].m_interval_sum.LowPart);
dur = ((double)method[n][i].m_interval_sum.LowPart) / ((double)method[n][i].m_nSamples * (double)freq.LowPart);
fprintf(pf, " avg: %u\n", method[n][i].m_interval_sum.LowPart / method[n][i].m_nSamples);
fprintf(pf, " avg time: %f sec\n", dur);
Tracef(" avg: %u\n", method[n][i].m_interval_sum.LowPart / method[n][i].m_nSamples);
Tracef(" avg time: %f sec\n", dur);
}
fprintf(pf, "\n\n");
Tracef("\n\n");
}
fclose(pf);
MessageBeep(MB_OK);
//BOOL QueryPerformanceFrequency(
// LARGE_INTEGER *lpFrequency // address of current frequency
//);
}
inline void GetColorBlockColors_m2(DXTColBlock * pBlock, Color8888 * col_0, Color8888 * col_1,
Color8888 * col_2, Color8888 * col_3,
WORD & wrd )
{
// method 2
// freak variable bit structure method
// normal math
Color565 * pCol;
pCol = (Color565*) & (pBlock->col0);
col_0->a = 0xff;
col_0->r = pCol->nRed;
col_0->r <<= 3; // shift to full precision
col_0->g = pCol->nGreen;
col_0->g <<= 2;
col_0->b = pCol->nBlue;
col_0->b <<= 3;
pCol = (Color565*) & (pBlock->col1);
col_1->a = 0xff;
col_1->r = pCol->nRed;
col_1->r <<= 3; // shift to full precision
col_1->g = pCol->nGreen;
col_1->g <<= 2;
col_1->b = pCol->nBlue;
col_1->b <<= 3;
if (pBlock->col0 > pBlock->col1)
{
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
wrd = ((WORD) col_0->r * 2 + (WORD) col_1->r) / 3;
// no +1 for rounding
// as bits have been shifted to 888
col_2->r = (BYTE)wrd;
wrd = ((WORD) col_0->g * 2 + (WORD) col_1->g) / 3;
col_2->g = (BYTE)wrd;
wrd = ((WORD) col_0->b * 2 + (WORD) col_1->b) / 3;
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
wrd = ((WORD) col_0->r + (WORD) col_1->r * 2) / 3;
col_3->r = (BYTE)wrd;
wrd = ((WORD) col_0->g + (WORD) col_1->g * 2) / 3;
col_3->g = (BYTE)wrd;
wrd = ((WORD) col_0->b + (WORD) col_1->b * 2) / 3;
col_3->b = (BYTE)wrd;
col_3->a = 0xff;
}
else
{
// Three-color block: derive the other color.
// 00 = color_0, 01 = color_1, 10 = color_2,
// 11 = transparent.
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
// explicit for each component, unlike some refrasts...
// Tracef("block has alpha\n");
wrd = ((WORD) col_0->r + (WORD) col_1->r) / 2;
col_2->r = (BYTE)wrd;
wrd = ((WORD) col_0->g + (WORD) col_1->g) / 2;
col_2->g = (BYTE)wrd;
wrd = ((WORD) col_0->b + (WORD) col_1->b) / 2;
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
col_3->r = 0x00; // random color to indicate alpha
col_3->g = 0xff;
col_3->b = 0xff;
col_3->a = 0x00;
}
}
inline void GetColorBlockColors_m3(DXTColBlock * pBlock, Color8888 * col_0, Color8888 * col_1,
Color8888 * col_2, Color8888 * col_3,
WORD & wrd )
{
// method 3
//////////////////////////////////////////////////////
// super-freak variable bit structure with
// Cool Math Trick (tm)
// Do 2/3 1/3 math BEFORE bit shift on the whole DWORD
// as the fields will NEVER carry into the next
// or overflow!! =)
Color565 * pCol;
pCol = (Color565*) & (pBlock->col0);
col_0->a = 0x00; // must set to 0 to avoid overflow in DWORD add
col_0->r = pCol->nRed;
col_0->g = pCol->nGreen;
col_0->b = pCol->nBlue;
pCol = (Color565*) & (pBlock->col1);
col_1->a = 0x00;
col_1->r = pCol->nRed;
col_1->g = pCol->nGreen;
col_1->b = pCol->nBlue;
if (pBlock->col0 > pBlock->col1)
{
*((DWORD*)col_2) = ((*((DWORD*)col_0)) * 2 + (*((DWORD*)col_1)));
*((DWORD*)col_3) = ((*((DWORD*)col_0)) + (*((DWORD*)col_1)) * 2);
// now shift to appropriate precision & divide by 3.
col_2->r = ((WORD) col_2->r << 3) / (WORD)3;
col_2->g = ((WORD) col_2->g << 2) / (WORD)3;
col_2->b = ((WORD) col_2->b << 3) / (WORD)3;
col_3->r = ((WORD) col_3->r << 3) / (WORD)3;
col_3->g = ((WORD) col_3->g << 2) / (WORD)3;
col_3->b = ((WORD) col_3->b << 3) / (WORD)3;
col_0->a = 0xff; // now set appropriate alpha
col_1->a = 0xff;
col_2->a = 0xff;
col_3->a = 0xff;
}
else
{
*((DWORD*)col_2) = ((*((DWORD*)col_0)) + (*((DWORD*)col_1)));
// now shift to appropriate precision & divide by 2.
// << 3) / 2 == << 2
// << 2) / 2 == << 1
col_2->r = ((WORD) col_2->r << 2);
col_2->g = ((WORD) col_2->g << 1);
col_2->b = ((WORD) col_2->b << 2);
col_2->a = 0xff;
col_3->a = 0x00; //
col_3->r = 0x00; // random color to indicate alpha
col_3->g = 0xff;
col_3->b = 0xff;
}
// now shift orig color components
col_0->r <<= 3;
col_0->g <<= 2;
col_0->b <<= 3;
col_1->r <<= 3;
col_1->g <<= 2;
col_1->b <<= 3;
}
inline void GetColorBlockColors_m4(DXTColBlock * pBlock, Color8888 * col_0, Color8888 * col_1,
Color8888 * col_2, Color8888 * col_3,
WORD & wrd )
{
// m1 color extraction from 5-6-5
// m3 color math on DWORD before bit shift to full precision
wrd = pBlock->col0;
col_0->a = 0x00; // must set to 0 to avoid possible overflow & carry to next field in DWORD add
// extract r,g,b bits
col_0->b = (unsigned char) wrd & 0x1f; // 0x1f = 0001 1111 to mask out upper 3 bits
wrd >>= 5;
col_0->g = (unsigned char) wrd & 0x3f; // 0x3f = 0011 1111 to mask out upper 2 bits
wrd >>= 6;
col_0->r = (unsigned char) wrd & 0x1f;
// same for col # 2:
wrd = pBlock->col1;
col_1->a = 0x00; // must set to 0 to avoid possible overflow in DWORD add
// extract r,g,b bits
col_1->b = (unsigned char) wrd & 0x1f;
wrd >>= 5;
col_1->g = (unsigned char) wrd & 0x3f;
wrd >>= 6;
col_1->r = (unsigned char) wrd & 0x1f;
if (pBlock->col0 > pBlock->col1)
{
*((DWORD*)col_2) = ((*((DWORD*)col_0)) * 2 + (*((DWORD*)col_1)));
*((DWORD*)col_3) = ((*((DWORD*)col_0)) + (*((DWORD*)col_1)) * 2);
// shift to appropriate precision & divide by 3.
col_2->r = ((WORD) col_2->r << 3) / (WORD)3;
col_2->g = ((WORD) col_2->g << 2) / (WORD)3;
col_2->b = ((WORD) col_2->b << 3) / (WORD)3;
col_3->r = ((WORD) col_3->r << 3) / (WORD)3;
col_3->g = ((WORD) col_3->g << 2) / (WORD)3;
col_3->b = ((WORD) col_3->b << 3) / (WORD)3;
col_0->a = 0xff; // set appropriate alpha
col_1->a = 0xff;
col_2->a = 0xff;
col_3->a = 0xff;
}
else
{
*((DWORD*)col_2) = ((*((DWORD*)col_0)) + (*((DWORD*)col_1)));
// shift to appropriate precision & divide by 2.
// << 3) / 2 == << 2
// << 2) / 2 == << 1
col_2->r = ((WORD) col_2->r << 2);
col_2->g = ((WORD) col_2->g << 1);
col_2->b = ((WORD) col_2->b << 2);
col_2->a = 0xff;
col_3->a = 0x00; //
col_3->r = 0x00; // random color to indicate alpha
col_3->g = 0xff;
col_3->b = 0xff;
}
// shift orig color components to full precision
col_0->r <<= 3;
col_0->g <<= 2;
col_0->b <<= 3;
col_1->r <<= 3;
col_1->g <<= 2;
col_1->b <<= 3;
}
inline void GetColorBlockColors_m1(DXTColBlock * pBlock, Color8888 * col_0, Color8888 * col_1,
Color8888 * col_2, Color8888 * col_3,
WORD & wrd )
{
// Method 1:
// Shifty method
wrd = pBlock->col0;
col_0->a = 0xff;
// extract r,g,b bits
col_0->b = (unsigned char) wrd;
col_0->b <<= 3; // shift to full precision
wrd >>= 5;
col_0->g = (unsigned char) wrd;
col_0->g <<= 2; // shift to full precision
wrd >>= 6;
col_0->r = (unsigned char) wrd;
col_0->r <<= 3; // shift to full precision
// same for col # 2:
wrd = pBlock->col1;
col_1->a = 0xff;
// extract r,g,b bits
col_1->b = (unsigned char) wrd;
col_1->b <<= 3; // shift to full precision
wrd >>= 5;
col_1->g = (unsigned char) wrd;
col_1->g <<= 2; // shift to full precision
wrd >>= 6;
col_1->r = (unsigned char) wrd;
col_1->r <<= 3; // shift to full precision
// use this for all but the super-freak math method
if (pBlock->col0 > pBlock->col1)
{
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
wrd = ((WORD) col_0->r * 2 + (WORD) col_1->r) / 3;
// no +1 for rounding
// as bits have been shifted to 888
col_2->r = (BYTE)wrd;
wrd = ((WORD) col_0->g * 2 + (WORD) col_1->g) / 3;
col_2->g = (BYTE)wrd;
wrd = ((WORD) col_0->b * 2 + (WORD) col_1->b) / 3;
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
wrd = ((WORD) col_0->r + (WORD) col_1->r * 2) / 3;
col_3->r = (BYTE)wrd;
wrd = ((WORD) col_0->g + (WORD) col_1->g * 2) / 3;
col_3->g = (BYTE)wrd;
wrd = ((WORD) col_0->b + (WORD) col_1->b * 2) / 3;
col_3->b = (BYTE)wrd;
col_3->a = 0xff;
}
else
{
// Three-color block: derive the other color.
// 00 = color_0, 01 = color_1, 10 = color_2,
// 11 = transparent.
// These two bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
// explicit for each component, unlike some refrasts...
// Tracef("block has alpha\n");
wrd = ((WORD) col_0->r + (WORD) col_1->r) / 2;
col_2->r = (BYTE)wrd;
wrd = ((WORD) col_0->g + (WORD) col_1->g) / 2;
col_2->g = (BYTE)wrd;
wrd = ((WORD) col_0->b + (WORD) col_1->b) / 2;
col_2->b = (BYTE)wrd;
col_2->a = 0xff;
col_3->r = 0x00; // random color to indicate alpha
col_3->g = 0xff;
col_3->b = 0xff;
col_3->a = 0x00;
}
} // Get color block colors (...)
void CDXTCImage::Time_Decomp5_01(int ntimes, TimingInfo * info)
{
int n;
info->m_nSamples = 0;
info->m_interval_sum.QuadPart = 0;
info->m_csName.Format("Timing decomp method 1: bit shift, for %d times\n", ntimes);
for (n = 0; n < ntimes; n++)
{
QueryPerformanceCounter(& info->m_start_clk);
int xblocks, yblocks;
xblocks = m_DDSD.dwWidth / 4;
yblocks = m_DDSD.dwHeight / 4;
int i,j;
DWORD * pBase = (DWORD*) m_pDecompBytes;
DWORD * pImPos = (DWORD*) pBase; // pos in decompressed data
WORD * pPos = (WORD*) m_pCompBytes; // pos in compressed data
DXTColBlock * pBlock;
DXTAlphaBlock3BitLinear * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD*) &col_0);
// ** See DecompressDXT5 code for comments!!
for (j = 0; j < yblocks; ++j)
{
pBlock = (DXTColBlock*) ((DWORD)m_pCompBytes + j * xblocks * 16);
for (i = 0; i < xblocks; ++i, ++pBlock)
{
pAlphaBlock = (DXTAlphaBlock3BitLinear*) pBlock;
pBlock++;
GetColorBlockColors_m1(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
pImPos = (DWORD*)((DWORD)pBase + i*16 + (j*4) * m_nWidth * 4);
DecodeColorBlock(pImPos, pBlock, m_nWidth, (DWORD*)&col_0, (DWORD*)&col_1,
(DWORD*)&col_2, (DWORD*)&col_3);
DecodeAlpha3BitLinear(pImPos, pAlphaBlock, m_nWidth, alphazero);
}
}
QueryPerformanceCounter(& info->m_end_clk);
info->m_nSamples ++;
info->m_interval_sum.QuadPart += info->m_end_clk.QuadPart - info->m_start_clk.QuadPart;
}
}
void CDXTCImage::Time_Decomp5_02(int ntimes, TimingInfo * info)
{
int n;
info->m_nSamples = 0;
info->m_interval_sum.QuadPart = 0;
info->m_csName.Format("Timing decomp method 2: bit field struct, for %d times\n", ntimes);
for (n = 0; n < ntimes; n++)
{
QueryPerformanceCounter(& info->m_start_clk);
int xblocks, yblocks;
xblocks = m_DDSD.dwWidth / 4;
yblocks = m_DDSD.dwHeight / 4;
int i,j;
DWORD * pBase = (DWORD*) m_pDecompBytes;
DWORD * pImPos = (DWORD*) pBase; // pos in decompressed data
WORD * pPos = (WORD*) m_pCompBytes; // pos in compressed data
DXTColBlock * pBlock;
DXTAlphaBlock3BitLinear * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD*) &col_0);
// ** See DecompressDXT5 code for comments!!
for (j = 0; j < yblocks; ++j)
{
pBlock = (DXTColBlock*) ((DWORD)m_pCompBytes + j * xblocks * 16);
for (i = 0; i < xblocks; ++i, ++pBlock)
{
pAlphaBlock = (DXTAlphaBlock3BitLinear*) pBlock;
pBlock++;
GetColorBlockColors_m2(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
pImPos = (DWORD*)((DWORD)pBase + i*16 + (j*4) * m_nWidth * 4);
DecodeColorBlock(pImPos, pBlock, m_nWidth, (DWORD*)&col_0, (DWORD*)&col_1,
(DWORD*)&col_2, (DWORD*)&col_3);
DecodeAlpha3BitLinear(pImPos, pAlphaBlock, m_nWidth, alphazero);
}
}
QueryPerformanceCounter(& info->m_end_clk);
info->m_nSamples ++;
info->m_interval_sum.QuadPart += info->m_end_clk.QuadPart - info->m_start_clk.QuadPart;
}
}
void CDXTCImage::Time_Decomp5_03(int ntimes, TimingInfo * info)
{
int n;
info->m_nSamples = 0;
info->m_interval_sum.QuadPart = 0;
info->m_csName.Format("Timing decomp method 3: bit field struct w/ pre-shift math, for %d times\n", ntimes);
for (n = 0; n < ntimes; n++)
{
QueryPerformanceCounter(& info->m_start_clk);
int xblocks, yblocks;
xblocks = m_DDSD.dwWidth / 4;
yblocks = m_DDSD.dwHeight / 4;
int i,j;
DWORD * pBase = (DWORD*) m_pDecompBytes;
DWORD * pImPos = (DWORD*) pBase; // pos in decompressed data
WORD * pPos = (WORD*) m_pCompBytes; // pos in compressed data
DXTColBlock * pBlock;
DXTAlphaBlock3BitLinear * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD*) &col_0);
// ** See DecompressDXT5 code for comments!!
for (j = 0; j < yblocks; ++j)
{
pBlock = (DXTColBlock*) ((DWORD)m_pCompBytes + j * xblocks * 16);
for (i = 0; i < xblocks; ++i, ++pBlock)
{
pAlphaBlock = (DXTAlphaBlock3BitLinear*) pBlock;
pBlock++;
GetColorBlockColors_m3(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
pImPos = (DWORD*)((DWORD)pBase + i*16 + (j*4) * m_nWidth * 4);
DecodeColorBlock(pImPos, pBlock, m_nWidth, (DWORD*)&col_0, (DWORD*)&col_1,
(DWORD*)&col_2, (DWORD*)&col_3);
DecodeAlpha3BitLinear(pImPos, pAlphaBlock, m_nWidth, alphazero);
}
}
QueryPerformanceCounter(& info->m_end_clk);
info->m_nSamples ++;
info->m_interval_sum.QuadPart += info->m_end_clk.QuadPart - info->m_start_clk.QuadPart;
}
}
void CDXTCImage::Time_Decomp5_04(int ntimes, TimingInfo * info)
{
int n;
info->m_nSamples = 0;
info->m_interval_sum.QuadPart = 0;
info->m_csName.Format("Timing decomp method 4: shift extract w/ pre-shift math, for %d times\n", ntimes);
QueryPerformanceCounter(& info->m_start_clk);
for (n = 0; n < ntimes; n++)
{
int xblocks, yblocks;
xblocks = m_DDSD.dwWidth / 4;
yblocks = m_DDSD.dwHeight / 4;
int i,j;
DWORD * pBase = (DWORD*) m_pDecompBytes;
DWORD * pImPos = (DWORD*) pBase; // pos in decompressed data
WORD * pPos = (WORD*) m_pCompBytes; // pos in compressed data
DXTColBlock * pBlock;
DXTAlphaBlock3BitLinear * pAlphaBlock;
Color8888 col_0, col_1, col_2, col_3;
WORD wrd;
// fill alphazero with appropriate value to zero out alpha when
// alphazero is ANDed with the image color 32 bit DWORD:
col_0.a = 0;
col_0.r = col_0.g = col_0.b = 0xff;
DWORD alphazero = *((DWORD*) &col_0);
// ** See DecompressDXT5 code for comments!!
for (j = 0; j < yblocks; ++j)
{
pBlock = (DXTColBlock*) ((DWORD)m_pCompBytes + j * xblocks * 16);
for (i = 0; i < xblocks; ++i, ++pBlock)
{
pAlphaBlock = (DXTAlphaBlock3BitLinear*) pBlock;
pBlock++;
GetColorBlockColors_m4(pBlock, &col_0, &col_1, &col_2, &col_3, wrd);
pImPos = (DWORD*)((DWORD)pBase + i*16 + (j*4) * m_nWidth * 4);
DecodeColorBlock(pImPos, pBlock, m_nWidth, (DWORD*)&col_0, (DWORD*)&col_1,
(DWORD*)&col_2, (DWORD*)&col_3);
DecodeAlpha3BitLinear(pImPos, pAlphaBlock, m_nWidth, alphazero);
}
}
}
QueryPerformanceCounter(& info->m_end_clk);
info->m_nSamples = ntimes;
info->m_interval_sum.QuadPart += info->m_end_clk.QuadPart - info->m_start_clk.QuadPart;
}
*/
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