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Correct some fuckery in inflineintersect()

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git-svn-id: https://svn.eduke32.com/eduke32@7042 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
terminx 2018-10-07 05:23:29 +00:00
parent f7c8eab261
commit f5928ad5c7
1 changed files with 19 additions and 15 deletions
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34
source/build/src/build.cpp
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@ -3036,28 +3036,32 @@ void inflineintersect(int32_t x1, int32_t y1, int32_t x2, int32_t y2,
int32_t *intx, int32_t *inty, int32_t *sign12, int32_t *sign34)
{
//p1 to p2 is a line segment
int64_t x21, y21, x34, y34, x31, y31, bot, topt, topu, t;
int64_t topt, topu, t;
x21 = x2-x1; x34 = x3-x4;
y21 = y2-y1; y34 = y3-y4;
bot = x21*y34 - y21*x34;
if (bot >= 0)
int64_t x21 = x2-x1;
int64_t x34 = x3-x4;
int64_t y21 = y2-y1;
int64_t y34 = y3-y4;
int64_t bot = x21*y34 - y21*x34;
if (EDUKE32_PREDICT_FALSE(bot == 0))
{
if (bot == 0) { *sign12 = *sign34 = 0; return; };
x31 = x3-x1; y31 = y3-y1;
topt = x31*y34 - y31*x34;
topu = x21*y31 - y21*x31;
*sign12 = *sign34 = 0;
return;
}
else
{
x31 = x3-x1; y31 = y3-y1;
topt = x31*y34 - y31*x34;
topu = x21*y31 - y21*x31;
int64_t const x31 = x3 - x1;
int64_t const y31 = y3 - y1;
topt = x31 * y34 - y31 * x34;
topu = x21 * y31 - y21 * x31;
}
t = (topt*(1<<24))/bot;
*intx = x1 + ((x21*t)>>24);
*inty = y1 + ((y21*t)>>24);
t = (topt * (1 << 24)) / bot;
*intx = x1 + ((x21 * t) >> 24);
*inty = y1 + ((y21 * t) >> 24);
*sign12 = topt < 0 ? -1 : 1;
*sign34 = topu < 0 ? -1 : 1;