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Add color endpoint mode decoding

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This commit is contained in:
Pavel Krajcevski 2014-02-27 17:02:38 -05:00
parent 90448df333
commit be24a67bfc
1 changed files with 63 additions and 4 deletions
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67
ASTCEncoder/src/Decompressor.cpp
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@ -291,15 +291,65 @@ namespace ASTCC {
return params;
}
void FillError(uint8 *outBuf, uint32 blockWidth, uint32 blockHeight) {
for(uint32 j = 0; j < blockHeight; j++)
for(uint32 i = 0; i < blockWidth; i++) {
reinterpret_cast<uint32 *>(outBuf)[j * blockWidth + i] = 0xFFFF00FF;
}
}
void DecompressBlock(const uint8 inBuf[16],
const uint32 blockWidth, const uint32 blockHeight,
uint8 *outBuf) {
BitStreamReadOnly strm(inBuf);
TexelWeightParams weightParams = DecodeBlockInfo(strm);
// Our weights should be smaller than our block size.
assert(weightParams.m_Width <= blockWidth);
assert(weightParams.m_Height <= blockHeight);
if(weightParams.m_Width > blockWidth) {
assert(!"Texel weight grid width should be smaller than block width");
FillError(outBuf, blockWidth, blockHeight);
return;
}
if(weightParams.m_Height > blockHeight) {
assert(!"Texel weight grid height should be smaller than block height");
FillError(outBuf, blockWidth, blockHeight);
return;
}
// Read num partitions
uint32 nPartitions = strm.ReadBits(2) + 1;
assert(nPartitions <= 4);
if(nPartitions == 4 && weightParams.m_bDualPlane) {
assert(!"Dual plane mode is incompatible with four partition blocks");
FillError(outBuf, blockWidth, blockHeight);
return;
}
// Based on the number of partitions, read the color endpoint mode for
// each partition.
uint32 partitionIndex = nPartitions;
uint32 colorEndpointMode[4] = {0, 0, 0, 0};
if(nPartitions == 1) {
colorEndpointMode[0] = strm.ReadBits(4);
} else {
uint32 restOfPartitionIndex = strm.ReadBits(10);
partitionIndex |= restOfPartitionIndex << 2;
uint32 CEM = strm.ReadBits(2) - 1;
for(uint32 i = 0; i < nPartitions; i++) {
colorEndpointMode[i] = CEM + strm.ReadBit();
}
for(uint32 i = 0; i < nPartitions; i++) {
colorEndpointMode[i] <<= 2;
if(i == 0 && nPartitions == 3) {
colorEndpointMode[i] += strm.ReadBit();
} else {
colorEndpointMode[i] += strm.ReadBits(2);
}
}
}
}
@ -310,9 +360,18 @@ namespace ASTCC {
uint32 blockIdx = 0;
for(uint32 j = 0; j < dcj.Width(); j++) {
for(uint32 i = 0; i < dcj.Height(); i++) {
const uint8 *blockPtr = dcj.InBuf() + blockIdx*16;
uint8 *dataPtr = dcj.OutBuf() + j*dcj.Width() + i;
uint32 uncompData[144];
uint8 *dataPtr = reinterpret_cast<uint8 *>(uncompData);
DecompressBlock(blockPtr, blockWidth, blockHeight, dataPtr);
uint8 *outRow = dcj.OutBuf() + (j*dcj.Width() + i)*4;
for(uint32 jj = 0; jj < blockHeight; jj++) {
memcpy(outRow + jj*dcj.Width()*4, uncompData + jj*blockWidth, blockWidth*4);
}
blockIdx++;
}
}