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Add support for decoding void extent blocks in the ASTC decoder.

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Fixes #25
This commit is contained in:
Pavel Krajcevski 2016-10-06 23:55:58 -07:00
parent 0b9db85b82
commit 82daf5b32b
1 changed files with 46 additions and 2 deletions
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48
ASTCEncoder/src/Decompressor.cpp
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@ -41,7 +41,8 @@ namespace ASTCC {
bool m_bDualPlane;
uint32 m_MaxWeight;
bool m_bError;
bool m_bVoidExtent;
bool m_bVoidExtentLDR;
bool m_bVoidExtentHDR;
TexelWeightParams() {
memset(this, 0, sizeof(*this));
@ -74,7 +75,17 @@ namespace ASTCC {
// Does this match the void extent block mode?
if((modeBits & 0x01FF) == 0x1FC) {
params.m_bVoidExtent = true;
if (modeBits & 0x200) {
params.m_bVoidExtentHDR = true;
} else {
params.m_bVoidExtentLDR = true;
}
// Next two bits must be one.
if (!(modeBits & 0x400) || !strm.ReadBit()) {
params.m_bError = true;
}
return params;
}
@ -256,6 +267,28 @@ namespace ASTCC {
return params;
}
void FillVoidExtentLDR(BitStreamReadOnly& strm, uint32* const outBuf,
uint32 blockWidth, uint32 blockHeight) {
// Don't actually care about the void extent, just read the bits...
for (int i = 0; i < 4; ++i) {
strm.ReadBits(13);
}
// Decode the RGBA components and renormalize them to the range [0, 255]
uint16 r = strm.ReadBits(16);
uint16 g = strm.ReadBits(16);
uint16 b = strm.ReadBits(16);
uint16 a = strm.ReadBits(16);
uint32 rgba = (r >> 8) | (g & 0xFF00) | (static_cast<uint32>(b) & 0xFF00) << 8
| (static_cast<uint32>(a) & 0xFF00) << 16;
for (uint32 j = 0; j < blockHeight; j++)
for (uint32 i = 0; i < blockWidth; i++) {
outBuf[j * blockWidth + i] = rgba;
}
}
void FillError(uint32 *outBuf, uint32 blockWidth, uint32 blockHeight) {
for(uint32 j = 0; j < blockHeight; j++)
for(uint32 i = 0; i < blockWidth; i++) {
@ -758,6 +791,17 @@ namespace ASTCC {
return;
}
if (weightParams.m_bVoidExtentLDR) {
FillVoidExtentLDR(strm, outBuf, blockWidth, blockHeight);
return;
}
if (weightParams.m_bVoidExtentHDR) {
assert(!"HDR void extent blocks are unsupported!");
FillError(outBuf, blockWidth, blockHeight);
return;
}
if(weightParams.m_Width > blockWidth) {
assert(!"Texel weight grid width should be smaller than block width");
FillError(outBuf, blockWidth, blockHeight);