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better approximation

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This commit is contained in:
Jaklyy 2024-03-16 06:51:07 -04:00
parent 2c457de681
commit 668e5580e0
1 changed files with 2 additions and 32 deletions
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34
src/GPU3D_Soft.h
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@ -180,41 +180,11 @@ private:
{ {
// Z-buffering: linear interpolation // Z-buffering: linear interpolation
// still doesn't quite match hardware... // still doesn't quite match hardware...
s32 disp = 0;
if (z0 < z1) if (z0 < z1)
{ return z0 + (((z1 - z0) / (xdiff << 1)) * (x<<1));
disp = z1 - z0;
}
else else
{ return z1 + (((z0 - z1) / (xdiff << 1)) * (xdiff-x<<1));
disp = z0 - z1;
}
/*if (dir)
{
if (z0 < z1) return z0 + ((z1 - z0) * x / xdiff);
else return z1 + ((z0 - z1) - ((z0 - z1) * x / xdiff));
}*/
u32 recip, recip2;
u32 shift = 0;
recip2 = recip = (x << 16) / xdiff;
while (recip2 > 0x100)
{
recip2 >>= 1;
shift++;
}
disp >>= shift;
if (z0 < z1)
{
return z0 + ((disp * recip) >> (16 - shift));
}
else
{
return z1 + ((z0-z1) - ((disp * recip) >> (16 - shift)));
}
} }
} }