OrdinaryMagician/vkdoom_m
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Add 1 pixel tall and wide texture support to the renderer

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- These require manual detection and overriding of the scaling factors to
  0, because a right shift of (32-0) bits wraps around to 0 and results in
  no shift at all rather than leaving the register zeroed out.
This commit is contained in:
Marisa Heit 2016-11-01 00:08:16 -05:00
commit 9388597443
4 changed files with 59 additions and 12 deletions
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45
src/r_plane.cpp
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@ -221,10 +221,26 @@ void R_MapPlane (int y, int x1)
distance = planeheight * yslope[y];
ds_xstep = xs_ToFixed(32-ds_xbits, distance * xstepscale);
ds_ystep = xs_ToFixed(32-ds_ybits, distance * ystepscale);
ds_xfrac = xs_ToFixed(32-ds_xbits, distance * basexfrac) + pviewx;
ds_yfrac = xs_ToFixed(32-ds_ybits, distance * baseyfrac) + pviewy;
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)
{
@ -357,7 +373,7 @@ void R_CalcTiltedLighting (double lval, double lend, int width)
//
//==========================================================================
void R_MapTiltedPlane (int y, int x1)
void R_MapTiltedPlane(int y, int x1)
{
int x2 = spanend[y];
int width = x2 - x1;
@ -366,18 +382,18 @@ void R_MapTiltedPlane (int y, int x1)
DWORD u, v;
int i;
iz = plane_sz[2] + plane_sz[1]*(centery-y) + plane_sz[0]*(x1-centerx);
iz = plane_sz[2] + plane_sz[1] * (centery - y) + plane_sz[0] * (x1 - centerx);
// Lighting is simple. It's just linear interpolation from start to end
if (plane_shade)
{
uz = (iz + plane_sz[0]*width) * planelightfloat;
uz = (iz + plane_sz[0] * width) * planelightfloat;
vz = iz * planelightfloat;
R_CalcTiltedLighting (vz, uz, width);
R_CalcTiltedLighting(vz, uz, width);
}
uz = plane_su[2] + plane_su[1]*(centery-y) + plane_su[0]*(x1-centerx);
vz = plane_sv[2] + plane_sv[1]*(centery-y) + plane_sv[0]*(x1-centerx);
uz = plane_su[2] + plane_su[1] * (centery - y) + plane_su[0] * (x1 - centerx);
vz = plane_sv[2] + plane_sv[1] * (centery - y) + plane_sv[0] * (x1 - centerx);
fb = ylookup[y] + x1 + dc_destorg;
@ -1888,6 +1904,15 @@ void R_DrawTiltedPlane (visplane_t *pl, double _xscale, double _yscale, fixed_t
}
}
// Hack in support for 1 x Z and Z x 1 texture sizes
if (ds_ybits == 0)
{
plane_sv[2] = plane_sv[1] = plane_sv[0] = 0;
}
if (ds_xbits = 0)
{
plane_su[2] = plane_su[1] = plane_su[0] = 0;
}
#if defined(X86_ASM)
if (ds_source != ds_curtiltedsource)
R_SetTiltedSpanSource_ASM (ds_source);