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Terrain trace freeze fix

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This commit is contained in:
L 2023-01-30 17:18:46 +01:00
parent a71c6db442
commit 65475f6bcc
1 changed files with 54 additions and 44 deletions
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28
code/qcommon/cm_terrain.c
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@ -1005,12 +1005,15 @@ void CM_TracePointThroughTerrainCollide( void )
fx = (g_trace.vStart[0] - g_trace.tc->vBounds[0][0]) * (SURFACE_CLIP_EPSILON / 8);
fy = (g_trace.vStart[1] - g_trace.tc->vBounds[0][1]) * (SURFACE_CLIP_EPSILON / 8);
i0 = ( int )floor( fx );
j0 = ( int )floor( fy );
i1 = ( int )floor( ( g_trace.vEnd[ 0 ] - g_trace.tc->vBounds[ 0 ][ 0 ] ) * ( SURFACE_CLIP_EPSILON / 8 ) );
j1 = ( int )floor( ( g_trace.vEnd[ 1 ] - g_trace.tc->vBounds[ 0 ][ 1 ] ) * ( SURFACE_CLIP_EPSILON / 8 ) );
i0 = (int64_t)floor(fx);
j0 = (int64_t)floor(fy);
i1 = (int64_t)floor((g_trace.vEnd[0] - g_trace.tc->vBounds[0][0]) * (SURFACE_CLIP_EPSILON / 8));
j1 = (int64_t)floor((g_trace.vEnd[1] - g_trace.tc->vBounds[0][1]) * (SURFACE_CLIP_EPSILON / 8));
if( CM_CheckStartInsideTerrain( i0, j0, fx - i0, fy - j0 ) )
const float dfx = fx - i0;
const float dfy = fy - j0;
if (CM_CheckStartInsideTerrain(i0, j0, dfx, dfy))
{
g_trace.tw->trace.startsolid = qtrue;
g_trace.tw->trace.allsolid = qtrue;
@ -1103,8 +1106,14 @@ void CM_TracePointThroughTerrainCollide( void )
dx = g_trace.vEnd[0] - g_trace.vStart[0];
dy = g_trace.vEnd[1] - g_trace.vStart[1];
if( dx > 0 )
// Fix
//==
// The original compares if delta float is zero
// not only it's slower, but it can be problematic if those floats are NaN
//==
if (i1 > i0)
{
// dx positive
d1 = 1;
di = i1 - i0;
dx2 = (i0 + 1 - fx) * dy;
@ -1114,11 +1123,12 @@ void CM_TracePointThroughTerrainCollide( void )
d1 = -1;
di = i0 - i1;
dx = -dx;
dx2 = ( fx - i0 ) * dy;
dx2 = dfx * dy;
}
if( dy > 0 )
if (j1 > j0)
{
// dy positive
d2 = 1;
dj = di + j1 - j0 + 1;
dy2 = (j0 + 1 - fy) * dx;
@ -1128,7 +1138,7 @@ void CM_TracePointThroughTerrainCollide( void )
d2 = -1;
dy = -dy;
dj = di + j0 - j1 + 1;
dy2 = ( fy - j0 ) * dx;
dy2 = dfy * dx;
dx2 = -dx2;
}