- Replaced toint/quickertoint with the portable routines from xs_Float.h. The

former used fistp, which is not portable across platforms, so cannot be
  used in the play simulation. They were only suitable for the renderer.
  xs_Float.h also has a very fast float->fixed conversion, so FLOAT2FIXED
  uses that now.
  (And I also learned that the FPU's round to nearest is not the rounding I
  learned in grade school but actually Banker's Rounding. I had no idea.)
  (Also, also, the only thing that could have made quickertoint faster than
  toint was that it stored a 32-bit int. I never timed them, and I doubt in
  practice there was any real difference between the two.)
- Changed atan2f to atan2. Using floats is not a win, because the result is
  returned as a double on the x87 stack, which the caller then needs to cast
  down to a float using fst/fld.

SVN r1990 (trunk)

src/r_plane.cpp

@@ -336,7 +336,7 @@ void R_MapTiltedPlane (int y, int x1)
 	{
 		uz = (iz + plane_sz[0]*width) * planelightfloat;
 		vz = iz * planelightfloat;
-		R_CalcTiltedLighting (toint (vz), toint (uz), width);
+		R_CalcTiltedLighting (xs_RoundToInt(vz), xs_RoundToInt(uz), width);
 	}
 
 	uz = plane_su[2] + plane_su[1]*(centery-y) + plane_su[0]*(x1-centerx);