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Use 64-bit R_PointToAngle in OpenGL culling to fix some big room issues

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This commit is contained in:
Hannu Hanhi 2020-07-25 21:50:24 +03:00
parent c944d3adf4
commit 24b828b362
3 changed files with 23 additions and 4 deletions
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8
src/hardware/hw_main.c
View file

@ -2280,8 +2280,8 @@ static void HWR_AddLine(seg_t * line)
v2y = FLOAT_TO_FIXED(((polyvertex_t *)gl_curline->pv2)->y);
// OPTIMIZE: quickly reject orthogonal back sides.
angle1 = R_PointToAngle(v1x, v1y);
angle2 = R_PointToAngle(v2x, v2y);
angle1 = R_PointToAngle64(v1x, v1y);
angle2 = R_PointToAngle64(v2x, v2y);
#ifdef NEWCLIP
// PrBoom: Back side, i.e. backface culling - read: endAngle >= startAngle!
@ -2574,8 +2574,8 @@ static boolean HWR_CheckBBox(fixed_t *bspcoord)
py2 = bspcoord[checkcoord[boxpos][3]];
#ifdef NEWCLIP
angle1 = R_PointToAngle(px1, py1);
angle2 = R_PointToAngle(px2, py2);
angle1 = R_PointToAngle64(px1, py1);
angle2 = R_PointToAngle64(px2, py2);
return gld_clipper_SafeCheckRange(angle2, angle1);
#else
// check clip list for an open space

18
src/r_main.c
View file

@ -318,6 +318,24 @@ angle_t R_PointToAngle(fixed_t x, fixed_t y)
0;
}
// This version uses 64-bit variables to avoid overflows with large values.
// Currently used only by OpenGL rendering.
angle_t R_PointToAngle64(INT64 x, INT64 y)
{
return (y -= viewy, (x -= viewx) || y) ?
x >= 0 ?
y >= 0 ?
(x > y) ? tantoangle[SlopeDivEx(y,x)] : // octant 0
ANGLE_90-tantoangle[SlopeDivEx(x,y)] : // octant 1
x > (y = -y) ? 0-tantoangle[SlopeDivEx(y,x)] : // octant 8
ANGLE_270+tantoangle[SlopeDivEx(x,y)] : // octant 7
y >= 0 ? (x = -x) > y ? ANGLE_180-tantoangle[SlopeDivEx(y,x)] : // octant 3
ANGLE_90 + tantoangle[SlopeDivEx(x,y)] : // octant 2
(x = -x) > (y = -y) ? ANGLE_180+tantoangle[SlopeDivEx(y,x)] : // octant 4
ANGLE_270-tantoangle[SlopeDivEx(x,y)] : // octant 5
0;
}
angle_t R_PointToAngle2(fixed_t pviewx, fixed_t pviewy, fixed_t x, fixed_t y)
{
return (y -= pviewy, (x -= pviewx) || y) ?

1
src/r_main.h
View file

@ -63,6 +63,7 @@ extern lighttable_t *zlight[LIGHTLEVELS][MAXLIGHTZ];
INT32 R_PointOnSide(fixed_t x, fixed_t y, node_t *node);
INT32 R_PointOnSegSide(fixed_t x, fixed_t y, seg_t *line);
angle_t R_PointToAngle(fixed_t x, fixed_t y);
angle_t R_PointToAngle64(INT64 x, INT64 y);
angle_t R_PointToAngle2(fixed_t px2, fixed_t py2, fixed_t px1, fixed_t py1);
angle_t R_PointToAngleEx(INT32 x2, INT32 y2, INT32 x1, INT32 y1);
fixed_t R_PointToDist(fixed_t x, fixed_t y);