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BC7 CPU codec fix for 3subsets quality problem

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Chuck Walbourn 2018-07-03 19:00:23 -07:00
parent 296120a763
commit 3931c8866f
1 changed files with 98 additions and 6 deletions
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104
DirectXTex/BC6HBC7.cpp
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@ -848,6 +848,7 @@ namespace
_In_reads_(BC7_MAX_REGIONS) const LDREndPntPair aEndPts[],
_In_reads_(NUM_PIXELS_PER_BLOCK) const size_t aIndex[],
_In_reads_(NUM_PIXELS_PER_BLOCK) const size_t aIndex2[]);
void FixEndpointPBits(_In_ const EncodeParams* pEP, _In_reads_(BC7_MAX_REGIONS) const LDREndPntPair *pOrigEndpoints, _Out_writes_(BC7_MAX_REGIONS) LDREndPntPair *pFixedEndpoints);
float Refine(_In_ const EncodeParams* pEP, _In_ size_t uShape, _In_ size_t uRotation, _In_ size_t uIndexMode);
float MapColors(_In_ const EncodeParams* pEP, _In_reads_(np) const LDRColorA aColors[], _In_ size_t np, _In_ size_t uIndexMode,
@ -3221,13 +3222,94 @@ void D3DX_BC7::EmitBlock(const EncodeParams* pEP, size_t uShape, size_t uRotatio
assert(uStartBit == 128);
}
_Use_decl_annotations_
void D3DX_BC7::FixEndpointPBits(const EncodeParams* pEP, const LDREndPntPair *pOrigEndpoints, LDREndPntPair *pFixedEndpoints)
{
const size_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
pFixedEndpoints[0] = pOrigEndpoints[0];
pFixedEndpoints[1] = pOrigEndpoints[1];
pFixedEndpoints[2] = pOrigEndpoints[2];
const size_t uPBits = ms_aInfo[pEP->uMode].uPBits;
if (uPBits)
{
const size_t uNumEP = size_t(1 + uPartitions) << 1;
uint8_t aPVote[BC7_MAX_REGIONS << 1] = { 0,0,0,0,0,0 };
uint8_t aCount[BC7_MAX_REGIONS << 1] = { 0,0,0,0,0,0 };
const LDRColorA RGBAPrec = ms_aInfo[pEP->uMode].RGBAPrec;
const LDRColorA RGBAPrecWithP = ms_aInfo[pEP->uMode].RGBAPrecWithP;
for (uint8_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
{
uint8_t ep = 0;
for (size_t i = 0; i <= uPartitions; i++)
{
if (RGBAPrec[ch] == RGBAPrecWithP[ch])
{
pFixedEndpoints[i].A[ch] = pOrigEndpoints[i].A[ch];
pFixedEndpoints[i].B[ch] = pOrigEndpoints[i].B[ch];
}
else
{
pFixedEndpoints[i].A[ch] = pOrigEndpoints[i].A[ch] >> 1;
pFixedEndpoints[i].B[ch] = pOrigEndpoints[i].B[ch] >> 1;
size_t idx = ep++ * uPBits / uNumEP;
assert(idx < (BC7_MAX_REGIONS << 1));
_Analysis_assume_(idx < (BC7_MAX_REGIONS << 1));
aPVote[idx] += pOrigEndpoints[i].A[ch] & 0x01;
aCount[idx]++;
idx = ep++ * uPBits / uNumEP;
assert(idx < (BC7_MAX_REGIONS << 1));
_Analysis_assume_(idx < (BC7_MAX_REGIONS << 1));
aPVote[idx] += pOrigEndpoints[i].B[ch] & 0x01;
aCount[idx]++;
}
}
}
// Compute the actual pbits we'll use when we encode block. Note this is not
// rounding the component indices correctly in cases the pbits != a component's LSB.
int pbits[BC7_MAX_REGIONS << 1];
for (size_t i = 0; i < uPBits; i++)
pbits[i] = aPVote[i] >(aCount[i] >> 1) ? 1 : 0;
// Now calculate the actual endpoints with proper pbits, so error calculations are accurate.
if (pEP->uMode == 1)
{
// shared pbits
for (uint8_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
{
for (size_t i = 0; i <= uPartitions; i++)
{
pFixedEndpoints[i].A[ch] = static_cast<uint8_t>((pFixedEndpoints[i].A[ch] << 1) | pbits[i]);
pFixedEndpoints[i].B[ch] = static_cast<uint8_t>((pFixedEndpoints[i].B[ch] << 1) | pbits[i]);
}
}
}
else
{
for (uint8_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
{
for (size_t i = 0; i <= uPartitions; i++)
{
pFixedEndpoints[i].A[ch] = static_cast<uint8_t>((pFixedEndpoints[i].A[ch] << 1) | pbits[i * 2 + 0]);
pFixedEndpoints[i].B[ch] = static_cast<uint8_t>((pFixedEndpoints[i].B[ch] << 1) | pbits[i * 2 + 1]);
}
}
}
}
}
_Use_decl_annotations_
float D3DX_BC7::Refine(const EncodeParams* pEP, size_t uShape, size_t uRotation, size_t uIndexMode)
{
assert(pEP);
assert(uShape < BC7_MAX_SHAPES);
_Analysis_assume_(uShape < BC7_MAX_SHAPES);
const LDREndPntPair* aEndPts = pEP->aEndPts[uShape];
const size_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
assert(uPartitions < BC7_MAX_REGIONS);
@ -3242,15 +3324,25 @@ float D3DX_BC7::Refine(const EncodeParams* pEP, size_t uShape, size_t uRotation,
float aOrgErr[BC7_MAX_REGIONS];
float aOptErr[BC7_MAX_REGIONS];
const LDREndPntPair* aEndPts = &pEP->aEndPts[uShape][0];
for (size_t p = 0; p <= uPartitions; p++)
{
aOrgEndPts[p].A = Quantize(aEndPts[p].A, ms_aInfo[pEP->uMode].RGBAPrecWithP);
aOrgEndPts[p].B = Quantize(aEndPts[p].B, ms_aInfo[pEP->uMode].RGBAPrecWithP);
}
AssignIndices(pEP, uShape, uIndexMode, aOrgEndPts, aOrgIdx, aOrgIdx2, aOrgErr);
OptimizeEndPoints(pEP, uShape, uIndexMode, aOrgErr, aOrgEndPts, aOptEndPts);
AssignIndices(pEP, uShape, uIndexMode, aOptEndPts, aOptIdx, aOptIdx2, aOptErr);
LDREndPntPair newEndPts1[BC7_MAX_REGIONS];
FixEndpointPBits(pEP, aOrgEndPts, newEndPts1);
AssignIndices(pEP, uShape, uIndexMode, newEndPts1, aOrgIdx, aOrgIdx2, aOrgErr);
OptimizeEndPoints(pEP, uShape, uIndexMode, aOrgErr, newEndPts1, aOptEndPts);
LDREndPntPair newEndPts2[BC7_MAX_REGIONS];
FixEndpointPBits(pEP, aOptEndPts, newEndPts2);
AssignIndices(pEP, uShape, uIndexMode, newEndPts2, aOptIdx, aOptIdx2, aOptErr);
float fOrgTotErr = 0, fOptTotErr = 0;
for (size_t p = 0; p <= uPartitions; p++)
@ -3260,12 +3352,12 @@ float D3DX_BC7::Refine(const EncodeParams* pEP, size_t uShape, size_t uRotation,
}
if (fOptTotErr < fOrgTotErr)
{
EmitBlock(pEP, uShape, uRotation, uIndexMode, aOptEndPts, aOptIdx, aOptIdx2);
EmitBlock(pEP, uShape, uRotation, uIndexMode, newEndPts2, aOptIdx, aOptIdx2);
return fOptTotErr;
}
else
{
EmitBlock(pEP, uShape, uRotation, uIndexMode, aOrgEndPts, aOrgIdx, aOrgIdx2);
EmitBlock(pEP, uShape, uRotation, uIndexMode, newEndPts1, aOrgIdx, aOrgIdx2);
return fOrgTotErr;
}
}