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Reverse the bits of the ASTC block in order to read the texel weight data...

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This commit is contained in:
Pavel Krajcevski 2014-05-08 00:45:23 +02:00
parent 1269ab1314
commit a8514ba9b3
1 changed files with 11 additions and 10 deletions
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21
ASTCEncoder/src/Decompressor.cpp
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@ -915,18 +915,19 @@ namespace ASTCC {
// Read the texel weight data..
uint8 texelWeightData[16];
memset(texelWeightData, 0, sizeof(texelWeightData));
FasTC::BitStream texelWeightStream (texelWeightData, 16*8, 0);
memcpy(texelWeightData, inBuf, sizeof(texelWeightData));
int32 texelWeightBits = weightParams.GetPackedBitSize();
while(texelWeightBits > 0) {
uint32 nb = std::min(texelWeightBits, 8);
uint32 b = strm.ReadBits(nb);
texelWeightStream.WriteBits(b, nb);
texelWeightBits -= 8;
}
// Reverse everything
for(uint32 i = 0; i < 8; i++) {
// Taken from http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith64Bits
#define REVERSE_BYTE(b) (((b) * 0x80200802ULL) & 0x0884422110ULL) * 0x0101010101ULL >> 32
unsigned char a = REVERSE_BYTE(texelWeightData[i]);
unsigned char b = REVERSE_BYTE(texelWeightData[15 - i]);
#undef REVERSE_BYTE
assert(strm.GetBitsRead() == 128);
texelWeightData[i] = b;
texelWeightData[15-i] = a;
}
// Decode both color data and texel weight data
uint32 colorValues[32]; // Four values, two endpoints, four maximum paritions