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ok this makes a *lot* more sense

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Jaklyy
2024-03-30 08:05:47 -04:00
parent 8f450faa56
commit 3f42215602
1 changed files with 4 additions and 24 deletions
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22
src/GPU3D_Soft.h
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@ -83,21 +83,11 @@ private:
// calculate quotient and remainder for Z interpolation // calculate quotient and remainder for Z interpolation
if (!dir && !wbuffer && xdiff != 0) if (!dir && !wbuffer && xdiff != 0)
{
if (z0 < z1)
{ {
// remainder is unused for this path // remainder is unused for this path
this->zquo = ((z1 - z0) >> 1) / xdiff << 1; this->zquo = ((z1 - z0) >> 1) / xdiff << 1;
this->zcounter = z0; this->zcounter = z0;
} }
else
{
// should optimize down to one divide instruction
this->zquo = ((z0 - z1) >> 1) / xdiff << 1;
s32 rem = ((z0 - z1) >> 1) % xdiff << 1;
this->zcounter = z1 + (zquo * xdiff) + rem;
}
}
// linear mode is used if both W values are equal and have // linear mode is used if both W values are equal and have
// low-order bits cleared (0-6 along X, 1-6 along Y) // low-order bits cleared (0-6 along X, 1-6 along Y)
@ -204,17 +194,7 @@ private:
} }
else else
{ {
// these algorithms are weiiird but i can't argue with the results return zcounter += zquo;
if (z0 < z1)
{
zcounter += zquo;
return zcounter;
}
else
{
zcounter -= zquo;
return zcounter;
}
} }
} }
} }