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This version of equation() compiles into fewer instructions

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git-svn-id: https://svn.eduke32.com/eduke32@7592 1a8010ca-5511-0410-912e-c29ae57300e0
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terminx 2019-04-18 17:24:34 +00:00 committed by Christoph Oelckers
parent 413d68f1f8
commit 80d77f64cf
1 changed files with 4 additions and 12 deletions
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16
source/build/src/engine.cpp
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@ -8289,24 +8289,16 @@ int32_t renderDrawRoomsQ16(int32_t daposx, int32_t daposy, int32_t daposz,
// returns equation of a line given two points
static inline _equation equation(float const x1, float const y1, float const x2, float const y2)
{
_equation ret;
const float f = x2-x1;
// vertical
if (f == 0.f)
return { 1, 0, -x1 };
else
{
ret.a = 1;
ret.b = 0;
ret.c = -x1;
return ret;
float const ff = (y2 - y1) / f;
return { ff, -1, (y1 - (ff * x1)) };
}
ret.a = (float) (y2 - y1)/f;
ret.b = -1;
ret.c = (y1 - (ret.a * x1));
return ret;
}
int32_t wallvisible(int32_t const x, int32_t const y, int16_t const wallnum)