qzdoom/src/gl/scene/gl_fakeflat.cpp
Christoph Oelckers cf44d2e37a - adjustments.
2016-03-30 20:01:44 +02:00

402 lines
14 KiB
C++

/*
** gl_fakeflat.cpp
** Fake flat functions to render stacked sectors
**
**---------------------------------------------------------------------------
** Copyright 2001-2011 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
** 4. When not used as part of GZDoom or a GZDoom derivative, this code will be
** covered by the terms of the GNU Lesser General Public License as published
** by the Free Software Foundation; either version 2.1 of the License, or (at
** your option) any later version.
** 5. Full disclosure of the entire project's source code, except for third
** party libraries is mandatory. (NOTE: This clause is non-negotiable!)
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "p_lnspec.h"
#include "p_local.h"
#include "a_sharedglobal.h"
#include "r_sky.h"
#include "gl/renderer/gl_renderer.h"
#include "gl/scene/gl_clipper.h"
#include "gl/data/gl_data.h"
//==========================================================================
//
// Check whether the player can look beyond this line
//
//==========================================================================
CVAR(Bool, gltest_slopeopt, false, 0)
bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsector)
{
line_t *linedef = sidedef->linedef;
double bs_floorheight1;
double bs_floorheight2;
double bs_ceilingheight1;
double bs_ceilingheight2;
double fs_floorheight1;
double fs_floorheight2;
double fs_ceilingheight1;
double fs_ceilingheight2;
// Mirrors and horizons always block the view
//if (linedef->special==Line_Mirror || linedef->special==Line_Horizon) return true;
// Lines with stacked sectors must never block!
if (backsector->portals[sector_t::ceiling] != NULL || backsector->portals[sector_t::floor] != NULL ||
frontsector->portals[sector_t::ceiling] != NULL || frontsector->portals[sector_t::floor] != NULL)
{
return false;
}
// on large levels this distinction can save some time
// That's a lot of avoided multiplications if there's a lot to see!
if (frontsector->ceilingplane.isSlope())
{
fs_ceilingheight1 = frontsector->ceilingplane.ZatPoint(linedef->v1);
fs_ceilingheight2 = frontsector->ceilingplane.ZatPoint(linedef->v2);
}
else
{
fs_ceilingheight2 = fs_ceilingheight1 = frontsector->ceilingplane.fixD();
}
if (frontsector->floorplane.isSlope())
{
fs_floorheight1 = frontsector->floorplane.ZatPoint(linedef->v1);
fs_floorheight2 = frontsector->floorplane.ZatPoint(linedef->v2);
}
else
{
fs_floorheight2 = fs_floorheight1 = -frontsector->floorplane.fixD();
}
if (backsector->ceilingplane.isSlope())
{
bs_ceilingheight1 = backsector->ceilingplane.ZatPoint(linedef->v1);
bs_ceilingheight2 = backsector->ceilingplane.ZatPoint(linedef->v2);
}
else
{
bs_ceilingheight2 = bs_ceilingheight1 = backsector->ceilingplane.fixD();
}
if (backsector->floorplane.isSlope())
{
bs_floorheight1 = backsector->floorplane.ZatPoint(linedef->v1);
bs_floorheight2 = backsector->floorplane.ZatPoint(linedef->v2);
}
else
{
bs_floorheight2 = bs_floorheight1 = -backsector->floorplane.fixD();
}
// now check for closed sectors!
if (bs_ceilingheight1 <= fs_floorheight1 && bs_ceilingheight2 <= fs_floorheight2)
{
FTexture * tex = TexMan(sidedef->GetTexture(side_t::top));
if (!tex || tex->UseType == FTexture::TEX_Null) return false;
if (backsector->GetTexture(sector_t::ceiling) == skyflatnum &&
frontsector->GetTexture(sector_t::ceiling) == skyflatnum) return false;
return true;
}
if (fs_ceilingheight1 <= bs_floorheight1 && fs_ceilingheight2 <= bs_floorheight2)
{
FTexture * tex = TexMan(sidedef->GetTexture(side_t::bottom));
if (!tex || tex->UseType == FTexture::TEX_Null) return false;
// properly render skies (consider door "open" if both floors are sky):
if (backsector->GetTexture(sector_t::ceiling) == skyflatnum &&
frontsector->GetTexture(sector_t::ceiling) == skyflatnum) return false;
return true;
}
if (bs_ceilingheight1 <= bs_floorheight1 && bs_ceilingheight2 <= bs_floorheight2)
{
// preserve a kind of transparent door/lift special effect:
if (bs_ceilingheight1 < fs_ceilingheight1 || bs_ceilingheight2 < fs_ceilingheight2)
{
FTexture * tex = TexMan(sidedef->GetTexture(side_t::top));
if (!tex || tex->UseType == FTexture::TEX_Null) return false;
}
if (bs_floorheight1 > fs_floorheight1 || bs_floorheight2 > fs_floorheight2)
{
FTexture * tex = TexMan(sidedef->GetTexture(side_t::bottom));
if (!tex || tex->UseType == FTexture::TEX_Null) return false;
}
if (backsector->GetTexture(sector_t::ceiling) == skyflatnum &&
frontsector->GetTexture(sector_t::ceiling) == skyflatnum) return false;
if (backsector->GetTexture(sector_t::floor) == skyflatnum && frontsector->GetTexture(sector_t::floor)
== skyflatnum) return false;
return true;
}
return false;
}
//==========================================================================
//
// check for levels with exposed lower areas
//
//==========================================================================
void gl_CheckViewArea(vertex_t *v1, vertex_t *v2, sector_t *frontsector, sector_t *backsector)
{
if (in_area == area_default &&
(backsector->heightsec && !(backsector->heightsec->MoreFlags & SECF_IGNOREHEIGHTSEC)) &&
(!frontsector->heightsec || frontsector->heightsec->MoreFlags & SECF_IGNOREHEIGHTSEC))
{
sector_t * s = backsector->heightsec;
double cz1 = frontsector->ceilingplane.ZatPoint(v1);
double cz2 = frontsector->ceilingplane.ZatPoint(v2);
double fz1 = s->floorplane.ZatPoint(v1);
double fz2 = s->floorplane.ZatPoint(v2);
// allow some tolerance in case slopes are involved
if (cz1 <= fz1 + 1. / 100 && cz2 <= fz2 + 1. / 100)
in_area = area_below;
else
in_area = area_normal;
}
}
//==========================================================================
//
// This is mostly like R_FakeFlat but with a few alterations necessitated
// by hardware rendering
//
//==========================================================================
sector_t * gl_FakeFlat(sector_t * sec, sector_t * dest, area_t in_area, bool back)
{
if (!sec->heightsec || sec->heightsec->MoreFlags & SECF_IGNOREHEIGHTSEC || sec->heightsec==sec)
{
// check for backsectors with the ceiling lower than the floor. These will create
// visual glitches because upper amd lower textures overlap.
if (back && sec->planes[sector_t::floor].TexZ > sec->planes[sector_t::ceiling].TexZ)
{
if (!sec->floorplane.isSlope() && !sec->ceilingplane.isSlope())
{
*dest = *sec;
dest->ceilingplane=sec->floorplane;
dest->ceilingplane.FlipVert();
dest->planes[sector_t::ceiling].TexZ = dest->planes[sector_t::floor].TexZ;
dest->portals[sector_t::ceiling] = NULL;
dest->portals[sector_t::floor] = NULL;
return dest;
}
}
return sec;
}
#ifdef _DEBUG
if (sec-sectors==560)
{
int a = 0;
}
#endif
if (in_area==area_above)
{
if (sec->heightsec->MoreFlags&SECF_FAKEFLOORONLY /*|| sec->GetTexture(sector_t::ceiling)==skyflatnum*/) in_area=area_normal;
}
int diffTex = (sec->heightsec->MoreFlags & SECF_CLIPFAKEPLANES);
sector_t * s = sec->heightsec;
#if 0
*dest=*sec; // This will invoke the copy operator which isn't really needed here. Memcpy is faster.
#else
memcpy(dest, sec, sizeof(sector_t));
#endif
// Replace floor and ceiling height with control sector's heights.
if (diffTex)
{
if (s->floorplane.CopyPlaneIfValid (&dest->floorplane, &sec->ceilingplane))
{
dest->SetTexture(sector_t::floor, s->GetTexture(sector_t::floor), false);
dest->SetPlaneTexZ(sector_t::floor, s->GetPlaneTexZ(sector_t::floor));
dest->vboindex[sector_t::floor] = sec->vboindex[sector_t::vbo_fakefloor];
dest->vboheight[sector_t::floor] = s->vboheight[sector_t::floor];
}
else if (s->MoreFlags & SECF_FAKEFLOORONLY)
{
if (in_area==area_below)
{
dest->ColorMap=s->ColorMap;
if (!(s->MoreFlags & SECF_NOFAKELIGHT))
{
dest->lightlevel = s->lightlevel;
dest->SetPlaneLight(sector_t::floor, s->GetPlaneLight(sector_t::floor));
dest->SetPlaneLight(sector_t::ceiling, s->GetPlaneLight(sector_t::ceiling));
dest->ChangeFlags(sector_t::floor, -1, s->GetFlags(sector_t::floor));
dest->ChangeFlags(sector_t::ceiling, -1, s->GetFlags(sector_t::ceiling));
}
return dest;
}
return sec;
}
}
else
{
dest->SetPlaneTexZ(sector_t::floor, s->GetPlaneTexZ(sector_t::floor));
dest->floorplane = s->floorplane;
dest->vboindex[sector_t::floor] = sec->vboindex[sector_t::vbo_fakefloor];
dest->vboheight[sector_t::floor] = s->vboheight[sector_t::floor];
}
if (!(s->MoreFlags&SECF_FAKEFLOORONLY))
{
if (diffTex)
{
if (s->ceilingplane.CopyPlaneIfValid (&dest->ceilingplane, &sec->floorplane))
{
dest->SetTexture(sector_t::ceiling, s->GetTexture(sector_t::ceiling), false);
dest->SetPlaneTexZ(sector_t::ceiling, s->GetPlaneTexZ(sector_t::ceiling));
dest->vboindex[sector_t::ceiling] = sec->vboindex[sector_t::vbo_fakeceiling];
dest->vboheight[sector_t::ceiling] = s->vboheight[sector_t::ceiling];
}
}
else
{
dest->ceilingplane = s->ceilingplane;
dest->SetPlaneTexZ(sector_t::ceiling, s->GetPlaneTexZ(sector_t::ceiling));
dest->vboindex[sector_t::ceiling] = sec->vboindex[sector_t::vbo_fakeceiling];
dest->vboheight[sector_t::ceiling] = s->vboheight[sector_t::ceiling];
}
}
if (in_area==area_below)
{
dest->ColorMap=s->ColorMap;
dest->SetPlaneTexZ(sector_t::floor, sec->GetPlaneTexZ(sector_t::floor));
dest->SetPlaneTexZ(sector_t::ceiling, s->GetPlaneTexZ(sector_t::floor));
dest->floorplane=sec->floorplane;
dest->ceilingplane=s->floorplane;
dest->ceilingplane.FlipVert();
dest->vboindex[sector_t::floor] = sec->vboindex[sector_t::floor];
dest->vboheight[sector_t::floor] = sec->vboheight[sector_t::floor];
dest->vboindex[sector_t::ceiling] = sec->vboindex[sector_t::vbo_fakefloor];
dest->vboheight[sector_t::ceiling] = s->vboheight[sector_t::floor];
dest->portals[sector_t::ceiling] = NULL;
if (!(s->MoreFlags & SECF_NOFAKELIGHT))
{
dest->lightlevel = s->lightlevel;
}
if (!back)
{
dest->SetTexture(sector_t::floor, diffTex ? sec->GetTexture(sector_t::floor) : s->GetTexture(sector_t::floor), false);
dest->planes[sector_t::floor].xform = s->planes[sector_t::floor].xform;
//dest->ceilingplane = s->floorplane;
if (s->GetTexture(sector_t::ceiling) == skyflatnum)
{
dest->SetTexture(sector_t::ceiling, dest->GetTexture(sector_t::floor), false);
//dest->floorplane = dest->ceilingplane;
//dest->floorplane.FlipVert ();
//dest->floorplane.ChangeHeight (+1);
dest->planes[sector_t::ceiling].xform = dest->planes[sector_t::floor].xform;
}
else
{
dest->SetTexture(sector_t::ceiling, diffTex ? s->GetTexture(sector_t::floor) : s->GetTexture(sector_t::ceiling), false);
dest->planes[sector_t::ceiling].xform = s->planes[sector_t::ceiling].xform;
}
if (!(s->MoreFlags & SECF_NOFAKELIGHT))
{
dest->SetPlaneLight(sector_t::floor, s->GetPlaneLight(sector_t::floor));
dest->SetPlaneLight(sector_t::ceiling, s->GetPlaneLight(sector_t::ceiling));
dest->ChangeFlags(sector_t::floor, -1, s->GetFlags(sector_t::floor));
dest->ChangeFlags(sector_t::ceiling, -1, s->GetFlags(sector_t::ceiling));
}
}
}
else if (in_area == area_above)
{
dest->ColorMap = s->ColorMap;
dest->SetPlaneTexZ(sector_t::ceiling, sec->GetPlaneTexZ(sector_t::ceiling));
dest->SetPlaneTexZ(sector_t::floor, s->GetPlaneTexZ(sector_t::ceiling));
dest->ceilingplane = sec->ceilingplane;
dest->floorplane = s->ceilingplane;
dest->floorplane.FlipVert();
dest->vboindex[sector_t::floor] = sec->vboindex[sector_t::vbo_fakeceiling];
dest->vboheight[sector_t::floor] = s->vboheight[sector_t::ceiling];
dest->vboindex[sector_t::ceiling] = sec->vboindex[sector_t::ceiling];
dest->vboheight[sector_t::ceiling] = sec->vboheight[sector_t::ceiling];
dest->portals[sector_t::floor] = NULL;
if (!(s->MoreFlags & SECF_NOFAKELIGHT))
{
dest->lightlevel = s->lightlevel;
}
if (!back)
{
dest->SetTexture(sector_t::ceiling, diffTex ? sec->GetTexture(sector_t::ceiling) : s->GetTexture(sector_t::ceiling), false);
dest->SetTexture(sector_t::floor, s->GetTexture(sector_t::ceiling), false);
dest->planes[sector_t::ceiling].xform = dest->planes[sector_t::floor].xform = s->planes[sector_t::ceiling].xform;
if (s->GetTexture(sector_t::floor) != skyflatnum)
{
dest->SetTexture(sector_t::floor, s->GetTexture(sector_t::floor), false);
dest->planes[sector_t::floor].xform = s->planes[sector_t::floor].xform;
}
if (!(s->MoreFlags & SECF_NOFAKELIGHT))
{
dest->lightlevel = s->lightlevel;
dest->SetPlaneLight(sector_t::floor, s->GetPlaneLight(sector_t::floor));
dest->SetPlaneLight(sector_t::ceiling, s->GetPlaneLight(sector_t::ceiling));
dest->ChangeFlags(sector_t::floor, -1, s->GetFlags(sector_t::floor));
dest->ChangeFlags(sector_t::ceiling, -1, s->GetFlags(sector_t::ceiling));
}
}
}
return dest;
}