angle_t R_PointToAngle(fixed_t x, fixed_t y, int usePlayer)
{
static fixed_t oldx, oldy;
static angle_t oldresult;
if (usePlayer == 0)
{
x -= viewx; y -= viewy;
}
else
{
//SB- use player position rather than view position (as these will have stereo offset included
//and can mean different sprites for each eye!)
x -= viewplayer->mo->x;
y -= viewplayer->mo->y;
}
if ( /* !render_precise && */
// e6y: here is where "slime trails" can SOMETIMES occur
#ifdef GL_DOOM
(V_GetMode() != VID_MODEGL) &&
#endif
(x < INT_MAX/4 && x > -INT_MAX/4 && y < INT_MAX/4 && y > -INT_MAX/4)
)
{
// old R_PointToAngle
return (x || y) ?
x >= 0 ?
y >= 0 ?
(x > y) ? tantoangle[SlopeDiv(y,x)] : // octant 0
ANG90-1-tantoangle[SlopeDiv(x,y)] : // octant 1
x > (y = -y) ? 0-tantoangle[SlopeDiv(y,x)] : // octant 8
ANG270+tantoangle[SlopeDiv(x,y)] : // octant 7
y >= 0 ? (x = -x) > y ? ANG180-1-tantoangle[SlopeDiv(y,x)] : // octant 3
ANG90 + tantoangle[SlopeDiv(x,y)] : // octant 2
(x = -x) > (y = -y) ? ANG180+tantoangle[ SlopeDiv(y,x)] : // octant 4
ANG270-1-tantoangle[SlopeDiv(x,y)] : // octant 5
0;
}
// R_PointToAngleEx merged into R_PointToAngle
// e6y: The precision of the code above is abysmal so use the CRT atan2 function instead!
if (oldx != x || oldy != y)
{
oldx = x;
oldy = y;
oldresult = (int)(atan2(y, x) * ANG180/M_PI);
}
return oldresult;
}
angle_t R_PointToAngle2(fixed_t viewx, fixed_t viewy, fixed_t x, fixed_t y)
{
return (y -= viewy, (x -= viewx) || y) ?
x >= 0 ?
y >= 0 ?
(x > y) ? tantoangle[SlopeDiv(y,x)] : // octant 0
ANG90-1-tantoangle[SlopeDiv(x,y)] : // octant 1
x > (y = -y) ? 0-tantoangle[SlopeDiv(y,x)] : // octant 8
ANG270+tantoangle[SlopeDiv(x,y)] : // octant 7
y >= 0 ? (x = -x) > y ? ANG180-1-tantoangle[SlopeDiv(y,x)] : // octant 3
ANG90 + tantoangle[SlopeDiv(x,y)] : // octant 2
(x = -x) > (y = -y) ? ANG180+tantoangle[ SlopeDiv(y,x)] : // octant 4
ANG270-1-tantoangle[SlopeDiv(x,y)] : // octant 5
0;
}
angle_t R_PointToAngle(fixed_t x, fixed_t y)
{
#if 0
// JDC: the oldresult case only hit 10%, making it a net loss.
// JDC: added parenthesis to force constant evaluation
return (int)(atan2(y-viewy, x-viewx) * (ANG180/M_PI) );
#else
static fixed_t oldx, oldy;
static angle_t oldresult;
x -= viewx; y -= viewy;
if ( /* !render_precise && */
// e6y: here is where "slime trails" can SOMETIMES occur
#ifdef GL_DOOM
(V_GetMode() != VID_MODEGL) &&
#endif
(x < INT_MAX/4 && x > -INT_MAX/4 && y < INT_MAX/4 && y > -INT_MAX/4)
)
{
// old R_PointToAngle
return (x || y) ?
x >= 0 ?
y >= 0 ?
(x > y) ? tantoangle[SlopeDiv(y,x)] : // octant 0
ANG90-1-tantoangle[SlopeDiv(x,y)] : // octant 1
x > (y = -y) ? 0-tantoangle[SlopeDiv(y,x)] : // octant 8
ANG270+tantoangle[SlopeDiv(x,y)] : // octant 7
y >= 0 ? (x = -x) > y ? ANG180-1-tantoangle[SlopeDiv(y,x)] : // octant 3
ANG90 + tantoangle[SlopeDiv(x,y)] : // octant 2
(x = -x) > (y = -y) ? ANG180+tantoangle[ SlopeDiv(y,x)] : // octant 4
ANG270-1-tantoangle[SlopeDiv(x,y)] : // octant 5
0;
}
// R_PointToAngleEx merged into R_PointToAngle
// e6y: The precision of the code above is abysmal so use the CRT atan2 function instead!
if (oldx != x || oldy != y)
{
oldx = x;
oldy = y;
oldresult = (int)(atan2(y, x) * ANG180/M_PI );
}
return oldresult;
#endif
}
angle_t R_PointToAngle2(fixed_t viewx, fixed_t viewy, fixed_t x, fixed_t y)
{
x -= viewx;
y -= viewy;
if((x | y) == 0)
return 0;
if(x < R_P2ATHRESHOLD && x > -R_P2ATHRESHOLD &&
y < R_P2ATHRESHOLD && y > -R_P2ATHRESHOLD)
{
if(x >= 0)
{
if (y >= 0)
{
if(x > y)
{
// octant 0
return tantoangle_acc[SlopeDiv(y, x)];
}
else
{
// octant 1
return ANG90 - 1 - tantoangle_acc[SlopeDiv(x, y)];
}
}
else // y < 0
{
y = -y;
if(x > y)
{
// octant 8
return 0 - tantoangle_acc[SlopeDiv(y, x)];
}
else
{
// octant 7
return ANG270 + tantoangle_acc[SlopeDiv(x, y)];
}
}
}
else // x < 0
{
x = -x;
if(y >= 0)
{
if(x > y)
{
// octant 3
return ANG180 - 1 - tantoangle_acc[SlopeDiv(y, x)];
}
else
{
// octant 2
return ANG90 + tantoangle_acc[SlopeDiv(x, y)];
}
}
else // y < 0
{
y = -y;
if(x > y)
{
// octant 4
return ANG180 + tantoangle_acc[SlopeDiv(y, x)];
}
else
{
// octant 5
return ANG270 - 1 - tantoangle_acc[SlopeDiv(x, y)];
}
}
}
}
else
{
return (angle_t)(atan2((double)y, (double)x) * (ANG180 / PI));
}
return 0;
}