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optimization attempt

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This commit is contained in:
Jaklyy 2024-03-29 13:38:12 -04:00
parent 9ee9389ee1
commit c5b9c3d36d
1 changed files with 19 additions and 9 deletions
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28
src/GPU3D_Soft.h
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@ -87,13 +87,16 @@ private:
if (z0 < z1) if (z0 < z1)
{ {
// remainder is unused for this path // remainder is unused for this path
this->zquo = ((z1 - z0) >> 1) / xdiff; this->zquo = ((z1 - z0) >> 1) / xdiff << 1;
this->zcounter = z0;
} }
else else
{ {
// should optimize down to one divide instruction // should optimize down to one divide instruction
this->zquo = ((z0 - z1) >> 1) / xdiff; this->zquo = ((z0 - z1) >> 1) / xdiff << 1;
this->zrem = ((z0 - z1) >> 1) % xdiff; s32 rem = ((z0 - z1) >> 1) % xdiff << 1;
s32 idk = zquo * xdiff;
this->zcounter = z1 + idk + rem;
} }
} }
@ -154,7 +157,7 @@ private:
constexpr s32 Interpolate(s32 y0, s32 y1) const constexpr s32 Interpolate(s32 y0, s32 y1) const
{ {
if (xdiff == 0 || y0 == y1) return y0; if (x == 0 || y0 == y1) return y0;
if (!linear) if (!linear)
{ {
@ -174,9 +177,9 @@ private:
} }
} }
constexpr s32 InterpolateZ(s32 z0, s32 z1) const constexpr s32 InterpolateZ(s32 z0, s32 z1)
{ {
if (xdiff == 0 || z0 == z1) return z0; if (x == 0 || z0 == z1) return z0;
if (wbuffer) if (wbuffer)
{ {
@ -204,9 +207,15 @@ private:
{ {
// these algorithms are weiiird but i can't argue with the results // these algorithms are weiiird but i can't argue with the results
if (z0 < z1) if (z0 < z1)
return z0 + ((zquo * x) << 1); {
zcounter += zquo;
return zcounter;
}
else else
return z1 + ((zquo * (xdiff-x) + zrem) << 1); {
zcounter -= zquo;
return zcounter;
}
} }
} }
} }
@ -218,7 +227,8 @@ private:
bool linear; bool linear;
bool wbuffer; bool wbuffer;
s32 zquo, zrem; s32 zquo;
s32 zcounter;
s32 w0n, w0d, w1d; s32 w0n, w0d, w1d;
u32 yfactor; u32 yfactor;