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Improved point-on-line compatibility feature

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P_PointOnLineSide() and P_PointOnDivlineSide() functions from the initial Doom source code release are used in compatibility mode
This commit is contained in:
alexey.lysiuk 2015-09-15 18:21:05 +03:00
commit 39b18a3447
2 changed files with 98 additions and 7 deletions
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89
src/p_maputl.cpp
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@ -1523,3 +1523,92 @@ static AActor *RoughBlockCheck (AActor *mo, int index, void *param)
}
return NULL;
}
//===========================================================================
//
// P_VanillaPointOnLineSide
// P_PointOnLineSide() from the initial Doom source code release
//
//===========================================================================
int P_VanillaPointOnLineSide(fixed_t x, fixed_t y, const line_t* line)
{
fixed_t dx;
fixed_t dy;
fixed_t left;
fixed_t right;
if (!line->dx)
{
if (x <= line->v1->x)
return line->dy > 0;
return line->dy < 0;
}
if (!line->dy)
{
if (y <= line->v1->y)
return line->dx < 0;
return line->dx > 0;
}
dx = (x - line->v1->x);
dy = (y - line->v1->y);
left = FixedMul ( line->dy>>FRACBITS , dx );
right = FixedMul ( dy , line->dx>>FRACBITS );
if (right < left)
return 0; // front side
return 1; // back side
}
//===========================================================================
//
// P_VanillaPointOnDivlineSide
// P_PointOnDivlineSide() from the initial Doom source code release
//
//===========================================================================
int P_VanillaPointOnDivlineSide(fixed_t x, fixed_t y, const divline_t* line)
{
fixed_t dx;
fixed_t dy;
fixed_t left;
fixed_t right;
if (!line->dx)
{
if (x <= line->x)
return line->dy > 0;
return line->dy < 0;
}
if (!line->dy)
{
if (y <= line->y)
return line->dx < 0;
return line->dx > 0;
}
dx = (x - line->x);
dy = (y - line->y);
// try to quickly decide by looking at sign bits
if ( (line->dy ^ line->dx ^ dx ^ dy)&0x80000000 )
{
if ( (line->dy ^ dx) & 0x80000000 )
return 1; // (left is negative)
return 0;
}
left = FixedMul ( line->dy>>8, dx>>8 );
right = FixedMul ( dy>>8 , line->dx>>8 );
if (right < left)
return 0; // front side
return 1; // back side
}