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This commit is contained in:
Pavel Krajcevski 2014-03-25 16:23:04 -04:00
parent 7af6cca4d5
commit 6012b53cdb
1 changed files with 8 additions and 26 deletions
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34
BPTCEncoder/src/RGBAEndpoints.cpp
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@ -147,27 +147,9 @@ static inline void clamp(ty &x, const ty &min, const ty &max) {
// absolute distance. It turns out the compiler does a much
// better job of optimizing this than we can, since we can't
// translate the values to/from registers
static uint8 sad(uint8 a, uint8 b) {
#if 0
__asm
{
movzx eax, a
movzx ecx, b
sub eax, ecx
jns done
neg eax
done:
}
#else
//const INT d = a - b;
//const INT mask = d >> 31;
//return (d ^ mask) - mask;
// return abs(a - b);
template <typename ty>
static ty sad(ty a, ty b) {
return (a > b)? a - b : b - a;
#endif
}
///////////////////////////////////////////////////////////////////////////////
@ -180,7 +162,7 @@ uint8 QuantizeChannel(const uint8 val, const uint8 mask, const int pBit) {
// If the mask is all the bits, then we can just return the value.
if(mask == 0xFF) {
return val;
return val;
}
// Otherwise if the mask is no bits then we'll assume that they want
@ -211,7 +193,7 @@ uint8 QuantizeChannel(const uint8 val, const uint8 mask, const int pBit) {
lval |= lval >> prec;
hval |= hval >> prec;
if(sad(val, lval) < sad(val, hval))
if(sad<uint8>(val, lval) < sad<uint8>(val, hval))
return lval;
else
return hval;
@ -264,8 +246,8 @@ double RGBACluster::QuantizedError(
qp2 = p2.ToPixel(bitMask);
}
uint8 *pqp1 = (uint8 *)&qp1;
uint8 *pqp2 = (uint8 *)&qp2;
const uint8 *pqp1 = reinterpret_cast<const uint8 *>(&qp1);
const uint8 *pqp2 = reinterpret_cast<const uint8 *>(&qp2);
const RGBAVector metric = errorMetricVec;
@ -284,8 +266,8 @@ double RGBACluster::QuantizedError(
RGBAVector errorVec (0.0f);
for(uint32 k = 0; k < kNumColorChannels; k++) {
const uint8 ip = (((uint32(pqp1[k]) * interp0) + (uint32(pqp2[k]) * interp1) + 32) >> 6) & 0xFF;
const uint8 dist = sad(pb[k], ip);
const uint32 ip = (((pqp1[k] * interp0) + (pqp2[k] * interp1) + 32) >> 6) & 0xFF;
const uint8 dist = sad<uint8>(pb[k], ip);
errorVec[k] = static_cast<float>(dist) * metric[k];
}