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betterer approximation

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This commit is contained in:
Jaklyy 2024-03-16 12:09:47 -04:00
parent 668e5580e0
commit 672e6d03fa
1 changed files with 15 additions and 3 deletions
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18
src/GPU3D_Soft.h
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@ -181,10 +181,22 @@ private:
// Z-buffering: linear interpolation
// still doesn't quite match hardware...
if (z0 < z1)
return z0 + (((z1 - z0) / (xdiff << 1)) * (x<<1));
if (dir)
{
// seems like y dir does different interpolation?
// this probably isn't right...
if (z0 < z1)
return z0 + (z1-z0) * x / xdiff;
else
return z1 + (z0-z1) * (xdiff-x) / xdiff;
}
else
return z1 + (((z0 - z1) / (xdiff << 1)) * (xdiff-x<<1));
{
if (z0 < z1)
return z0 + (((z1-z0) / xdiff & ~0x1) * x);
else
return z1 + (((z0-z1) / xdiff & ~0x1) * (xdiff-x) + ((z0-z1) & 0xFF));
}
}
}