//
// R_MapPlane
//
// Uses global vars:
// planeheight
// ds_source
// basexscale
// baseyscale
// viewx
// viewy
//
// BASIC PRIMITIVE
//
void
R_MapPlane
( int y,
int x1,
int x2 )
{
angle_t angle;
fixed_t distance;
fixed_t length;
unsigned index;
#ifdef RANGECHECK
if (x2 < x1
|| x1 < 0
|| x2 >= viewwidth
|| y > viewheight)
{
I_Error ("R_MapPlane: %i, %i at %i",x1,x2,y);
}
#endif
if (planeheight != cachedheight[y])
{
cachedheight[y] = planeheight;
distance = cacheddistance[y] = FixedMul (planeheight, yslope[y]);
ds_xstep = cachedxstep[y] = FixedMul (distance,basexscale);
ds_ystep = cachedystep[y] = FixedMul (distance,baseyscale);
}
else
{
distance = cacheddistance[y];
ds_xstep = cachedxstep[y];
ds_ystep = cachedystep[y];
}
length = FixedMul (distance,distscale[x1]);
angle = (viewangle + xtoviewangle[x1])>>ANGLETOFINESHIFT;
ds_xfrac = viewx + FixedMul(finecosine[angle], length);
ds_yfrac = -viewy - FixedMul(finesine[angle], length);
if (fixedcolormap)
ds_colormap = fixedcolormap;
else
{
index = distance >> LIGHTZSHIFT;
if (index >= MAXLIGHTZ )
index = MAXLIGHTZ-1;
ds_colormap = planezlight[index];
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
// high or low detail
spanfunc ();
}
void R_MapPlane (int y, int x1)
{
int x2 = spanend[y];
double distance;
#ifdef RANGECHECK
if (x2 < x1 || x1<0 || x2>=viewwidth || (unsigned)y>=(unsigned)viewheight)
{
I_FatalError ("R_MapPlane: %i, %i at %i", x1, x2, y);
}
#endif
// [RH] Notice that I dumped the caching scheme used by Doom.
// It did not offer any appreciable speedup.
distance = planeheight * yslope[y];
if (ds_xbits != 0)
{
ds_xstep = xs_ToFixed(32 - ds_xbits, distance * xstepscale);
ds_xfrac = xs_ToFixed(32 - ds_xbits, distance * basexfrac) + pviewx;
}
else
{
ds_xstep = 0;
ds_xfrac = 0;
}
if (ds_ybits != 0)
{
ds_ystep = xs_ToFixed(32 - ds_ybits, distance * ystepscale);
ds_yfrac = xs_ToFixed(32 - ds_ybits, distance * baseyfrac) + pviewy;
}
else
{
ds_ystep = 0;
ds_yfrac = 0;
}
if (plane_shade)
{
// Determine lighting based on the span's distance from the viewer.
R_SetDSColorMapLight(basecolormap, GlobVis * fabs(CenterY - y), planeshade);
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc ();
}
//-----------------------------------------------------------------------------
//
// R_MapPlane
//
// Uses global vars:
// planeheight
// ds_source
// basexscale
// baseyscale
// viewx
// viewy
//
// BASIC PRIMITIVE
//
static void R_MapPlane (int y, int x1, int x2)
{
fixed_t distance;
int dx, dy;
unsigned index;
if (y == centery)
return;
#ifdef RANGECHECK
if (x2 < x1
|| x1<0
|| x2>=viewwidth
|| (unsigned)y>viewheight)
{
//I_Error ("R_MapPlane: %i, %i at %i\n",x1,x2,y);
printf ("R_MapPlane: %i, %i at %i\n",x1,x2,y);
return;
}
#endif
distance = FixedMul(planeheight, yslope[y]);
dx = x1 - centerx;
dy = ABS(centery - y);
ds_xstep = FixedMul(viewsin, planeheight) / dy;
ds_ystep = FixedMul(viewcos, planeheight) / dy;
ds_xfrac = viewx + xoffs + FixedMul(viewcos, distance) + dx * ds_xstep;
ds_yfrac = -viewy + yoffs - FixedMul(viewsin, distance) + dx * ds_ystep;
if (fixedcolormap)
ds_colormap = fixedcolormap;
else
{
index = distance >> LIGHTZSHIFT;
if (index >= MAXLIGHTZ )
index = MAXLIGHTZ-1;
ds_colormap = planezlight[index];
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc();
}
//
// R_MapLevelPlane
//
// [SL] 2012-11-09 - Based loosely on R_MapPlane() from PrBoom+ to increase
// the accuracy of texture-mapping visplanes with the same textures.
//
// e6y
//
// [RH]Instead of using the xtoviewangle array, I calculated the fractional values
// at the middle of the screen, then used the calculated ds_xstep and ds_ystep
// to step from those to the proper texture coordinate to start drawing at.
// That way, the texture coordinate is always calculated by its position
// on the screen and not by its position relative to the edge of the visplane.
//
// Visplanes with the same texture now match up far better than before.
//
void R_MapLevelPlane(int y, int x1, int x2)
{
double fdistance = fplaneheight * yslope[y] / 65536.0;
double slope = fplaneheight / abs(centery - y);
ds_xstep = (fixed_t)(pl_xstepscale * slope * focratio);
ds_ystep = (fixed_t)(pl_ystepscale * slope * focratio);
ds_xfrac = pl_viewxtrans +
FixedMul((int)(pl_viewcos * fdistance), pl_xscale) +
(x1 - centerx) * ds_xstep;
ds_yfrac = pl_viewytrans -
FixedMul((int)(pl_viewsin * fdistance), pl_yscale) +
(x1 - centerx) * ds_ystep;
ds_xstep <<= 10;
ds_ystep <<= 10;
ds_xfrac <<= 10;
ds_yfrac <<= 10;
if (fixedlightlev)
ds_colormap = basecolormap + fixedlightlev;
else if (fixedcolormap)
ds_colormap = fixedcolormap;
else
{
// Determine lighting based on the span's distance from the viewer.
unsigned int index = (int)fdistance >> (LIGHTZSHIFT - FRACBITS);
if (index >= MAXLIGHTZ)
index = MAXLIGHTZ-1;
ds_colormap = planezlight[index] + basecolormap;
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc ();
}
//
// R_MapLevelPlane
//
// [SL] 2012-11-09 - Based loosely on R_MapPlane() from PrBoom+ to increase
// the accuracy of texture-mapping visplanes with the same textures.
//
// e6y
//
// [RH]Instead of using the xtoviewangle array, I calculated the fractional values
// at the middle of the screen, then used the calculated ds_xstep and ds_ystep
// to step from those to the proper texture coordinate to start drawing at.
// That way, the texture coordinate is always calculated by its position
// on the screen and not by its position relative to the edge of the visplane.
//
// Visplanes with the same texture now match up far better than before.
//
void R_MapLevelPlane(int y, int x1, int x2)
{
fixed_t distance = FixedMul(planeheight, yslope[y]);
fixed_t slope = (fixed_t)(focratio * FixedDiv(planeheight, abs(centery - y) << FRACBITS));
ds_xstep = FixedMul(pl_xstepscale, slope);
ds_ystep = FixedMul(pl_ystepscale, slope);
ds_xfrac = pl_viewxtrans +
FixedMul(FixedMul(pl_viewcos, distance), pl_xscale) +
(x1 - centerx) * ds_xstep;
ds_yfrac = pl_viewytrans -
FixedMul(FixedMul(pl_viewsin, distance), pl_yscale) +
(x1 - centerx) * ds_ystep;
if (fixedlightlev)
ds_colormap = basecolormap + fixedlightlev;
else if (fixedcolormap)
ds_colormap = fixedcolormap;
else
{
// Determine lighting based on the span's distance from the viewer.
unsigned int index = distance >> LIGHTZSHIFT;
if (index >= MAXLIGHTZ)
index = MAXLIGHTZ-1;
ds_colormap = planezlight[index] + basecolormap;
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc ();
}
