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- replaced AM_Rotate with a more precise floating point version posted by Entryway.

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SVN r2713 (trunk)
This commit is contained in:
Christoph Oelckers 2010-09-07 20:23:44 +00:00
parent 31754a582d
commit ce2c2bd825
1 changed files with 11 additions and 6 deletions
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17
src/am_map.cpp
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@ -1938,14 +1938,19 @@ void AM_drawWalls (bool allmap)
//
//=============================================================================
void AM_rotate (fixed_t *x, fixed_t *y, angle_t a)
void AM_rotate(fixed_t *xp, fixed_t *yp, angle_t a)
{
fixed_t tmpx;
double x = FIXED2FLOAT(*xp);
double y = FIXED2FLOAT(*yp);
double rot = (double)a / (double)(1u << 31) * (double)M_PI;
double sinrot = sin(rot);
double cosrot = cos(rot);
a >>= ANGLETOFINESHIFT;
tmpx = DMulScale16 (*x,finecosine[a],*y,-finesine[a]);
*y = DMulScale16 (*x,finesine[a],*y,finecosine[a]);
*x = tmpx;
double tmpx = (x * cosrot) - (y * sinrot);
y = (x * sinrot) + (y * cosrot);
x = tmpx;
*xp = FLOAT2FIXED(x);
*yp = FLOAT2FIXED(y);
}
//=============================================================================