CACHE_BASE::CACHE_BASE(std::string name, UINT32 cacheSize, UINT32 lineSize, UINT32 associativity)
: _name(name),
_cacheSize(cacheSize),
_lineSize(lineSize),
_associativity(associativity),
_lineShift(FloorLog2(lineSize)),
_setIndexMask((cacheSize / (associativity * lineSize)) - 1)
{
ASSERTX(IsPower2(_lineSize));
ASSERTX(IsPower2(_setIndexMask + 1));
for (UINT32 accessType = 0; accessType < ACCESS_TYPE_NUM; accessType++)
{
_access[accessType][false] = 0;
_access[accessType][true] = 0;
}
}
void DDS::readBioWareHeader(Common::SeekableReadStream &dds) {
dds.seek(0);
// Image dimensions
uint32 width = dds.readUint32LE();
uint32 height = dds.readUint32LE();
// Check that the width and height are really powers of 2
if (!IsPower2(width) || !IsPower2(height))
throw Common::Exception("Width and height must be powers of 2");
// Always compressed
_compressed = true;
// Check which compression
uint32 bpp = dds.readUint32LE();
if (bpp == 3) {
_hasAlpha = false;
_format = kPixelFormatBGR;
_formatRaw = kPixelFormatDXT1;
_dataType = kPixelDataType8;
} else if (bpp == 4) {
_hasAlpha = true;
_format = kPixelFormatBGRA;
_formatRaw = kPixelFormatDXT5;
_dataType = kPixelDataType8;
} else
throw Common::Exception("Unsupported bytes per pixel value (%d)", bpp);
// Sanity check for the image data size
uint32 dataSize = dds.readUint32LE();
if (((bpp == 3) && (dataSize != ((width * height) / 2))) ||
((bpp == 4) && (dataSize != ((width * height) ))))
throw Common::Exception("Invalid data size (%dx%dx%d %d)", width, height, bpp, dataSize);
dds.skip(4); // Some float
// Number of bytes left for the image data
uint32 fullDataSize = dds.size() - dds.pos();
// Detect how many mip maps are in the DDS
do {
MipMap *mipMap = new MipMap;
mipMap->width = MAX<uint32>(width, 1);
mipMap->height = MAX<uint32>(height, 1);
setSize(*mipMap);
if (fullDataSize < mipMap->size) {
// Wouldn't fit
delete mipMap;
break;
}
fullDataSize -= mipMap->size;
_mipMaps.push_back(mipMap);
width >>= 1;
height >>= 1;
} while ((width >= 1) && (height >= 1));
}
