mirror of
https://github.com/ZDoom/qzdoom.git
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260 lines
7.4 KiB
C++
260 lines
7.4 KiB
C++
//
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//---------------------------------------------------------------------------
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//
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// Copyright(C) 2006-2016 Christoph Oelckers
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// All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//--------------------------------------------------------------------------
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//
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#include "r_defs.h"
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#include "hwrenderer/data/flatvertices.h"
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#include "hwrenderer/scene/hw_drawinfo.h"
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#include "hwrenderer/scene/hw_drawstructs.h"
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EXTERN_CVAR(Bool, gl_seamless)
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//==========================================================================
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//
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// Split upper edge of wall
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//
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//==========================================================================
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void GLWall::SplitUpperEdge(FFlatVertex *&ptr)
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{
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side_t *sidedef = seg->sidedef;
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float polyw = glseg.fracright - glseg.fracleft;
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float facu = (tcs[UPRGT].u - tcs[UPLFT].u) / polyw;
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float facv = (tcs[UPRGT].v - tcs[UPLFT].v) / polyw;
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float fact = (ztop[1] - ztop[0]) / polyw;
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float facc = (zceil[1] - zceil[0]) / polyw;
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float facf = (zfloor[1] - zfloor[0]) / polyw;
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for (int i = 0; i < sidedef->numsegs - 1; i++)
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{
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seg_t *cseg = sidedef->segs[i];
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float sidefrac = cseg->sidefrac;
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if (sidefrac <= glseg.fracleft) continue;
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if (sidefrac >= glseg.fracright) return;
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float fracfac = sidefrac - glseg.fracleft;
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ptr->x = cseg->v2->fX();
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ptr->y = cseg->v2->fY();
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ptr->z = ztop[0] + fact * fracfac;
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ptr->u = tcs[UPLFT].u + facu * fracfac;
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ptr->v = tcs[UPLFT].v + facv * fracfac;
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ptr++;
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}
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}
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//==========================================================================
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//
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// Split upper edge of wall
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//
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//==========================================================================
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void GLWall::SplitLowerEdge(FFlatVertex *&ptr)
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{
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side_t *sidedef = seg->sidedef;
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float polyw = glseg.fracright - glseg.fracleft;
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float facu = (tcs[LORGT].u - tcs[LOLFT].u) / polyw;
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float facv = (tcs[LORGT].v - tcs[LOLFT].v) / polyw;
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float facb = (zbottom[1] - zbottom[0]) / polyw;
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float facc = (zceil[1] - zceil[0]) / polyw;
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float facf = (zfloor[1] - zfloor[0]) / polyw;
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for (int i = sidedef->numsegs - 2; i >= 0; i--)
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{
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seg_t *cseg = sidedef->segs[i];
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float sidefrac = cseg->sidefrac;
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if (sidefrac >= glseg.fracright) continue;
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if (sidefrac <= glseg.fracleft) return;
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float fracfac = sidefrac - glseg.fracleft;
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ptr->x = cseg->v2->fX();
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ptr->y = cseg->v2->fY();
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ptr->z = zbottom[0] + facb * fracfac;
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ptr->u = tcs[LOLFT].u + facu * fracfac;
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ptr->v = tcs[LOLFT].v + facv * fracfac;
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ptr++;
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}
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}
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//==========================================================================
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//
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// Split left edge of wall
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//
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//==========================================================================
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void GLWall::SplitLeftEdge(FFlatVertex *&ptr)
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{
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if (vertexes[0] == NULL) return;
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vertex_t * vi = vertexes[0];
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if (vi->numheights)
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{
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int i = 0;
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float polyh1 = ztop[0] - zbottom[0];
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float factv1 = polyh1 ? (tcs[UPLFT].v - tcs[LOLFT].v) / polyh1 : 0;
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float factu1 = polyh1 ? (tcs[UPLFT].u - tcs[LOLFT].u) / polyh1 : 0;
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while (i<vi->numheights && vi->heightlist[i] <= zbottom[0]) i++;
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while (i<vi->numheights && vi->heightlist[i] < ztop[0])
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{
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ptr->x = glseg.x1;
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ptr->y = glseg.y1;
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ptr->z = vi->heightlist[i];
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ptr->u = factu1*(vi->heightlist[i] - ztop[0]) + tcs[UPLFT].u;
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ptr->v = factv1*(vi->heightlist[i] - ztop[0]) + tcs[UPLFT].v;
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ptr++;
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i++;
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}
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}
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}
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//==========================================================================
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//
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// Split right edge of wall
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//
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//==========================================================================
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void GLWall::SplitRightEdge(FFlatVertex *&ptr)
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{
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if (vertexes[1] == NULL) return;
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vertex_t * vi = vertexes[1];
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if (vi->numheights)
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{
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int i = vi->numheights - 1;
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float polyh2 = ztop[1] - zbottom[1];
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float factv2 = polyh2 ? (tcs[UPRGT].v - tcs[LORGT].v) / polyh2 : 0;
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float factu2 = polyh2 ? (tcs[UPRGT].u - tcs[LORGT].u) / polyh2 : 0;
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while (i>0 && vi->heightlist[i] >= ztop[1]) i--;
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while (i>0 && vi->heightlist[i] > zbottom[1])
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{
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ptr->x = glseg.x2;
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ptr->y = glseg.y2;
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ptr->z = vi->heightlist[i];
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ptr->u = factu2*(vi->heightlist[i] - ztop[1]) + tcs[UPRGT].u;
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ptr->v = factv2*(vi->heightlist[i] - ztop[1]) + tcs[UPRGT].v;
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ptr++;
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i--;
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}
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}
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}
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//==========================================================================
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//
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// Create vertices for one wall
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//
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//==========================================================================
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void GLWall::CreateVertices(FFlatVertex *&ptr, bool split)
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{
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ptr->Set(glseg.x1, zbottom[0], glseg.y1, tcs[LOLFT].u, tcs[LOLFT].v);
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ptr++;
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if (split && glseg.fracleft == 0) SplitLeftEdge(ptr);
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ptr->Set(glseg.x1, ztop[0], glseg.y1, tcs[UPLFT].u, tcs[UPLFT].v);
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ptr++;
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if (split && !(flags & GLWF_NOSPLITUPPER && seg->sidedef->numsegs > 1)) SplitUpperEdge(ptr);
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ptr->Set(glseg.x2, ztop[1], glseg.y2, tcs[UPRGT].u, tcs[UPRGT].v);
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ptr++;
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if (split && glseg.fracright == 1) SplitRightEdge(ptr);
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ptr->Set(glseg.x2, zbottom[1], glseg.y2, tcs[LORGT].u, tcs[LORGT].v);
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ptr++;
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if (split && !(flags & GLWF_NOSPLITLOWER) && seg->sidedef->numsegs > 1) SplitLowerEdge(ptr);
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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int GLWall::CountVertices()
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{
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int cnt = 4;
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vertex_t * vi = vertexes[0];
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if (glseg.fracleft == 0 && vi != nullptr && vi->numheights)
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{
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int i = 0;
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while (i<vi->numheights && vi->heightlist[i] <= zbottom[0]) i++;
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while (i<vi->numheights && vi->heightlist[i] < ztop[0])
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{
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i++;
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cnt++;
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}
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}
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auto sidedef = seg->sidedef;
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constexpr auto NOSPLIT_LOWER_UPPER = GLWF_NOSPLITLOWER | GLWF_NOSPLITUPPER;
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const bool canSplit = (flags & NOSPLIT_LOWER_UPPER) != NOSPLIT_LOWER_UPPER;
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if (canSplit && sidedef->numsegs > 1)
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{
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int cnt2 = 0;
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for (int i = sidedef->numsegs - 2; i >= 0; i--)
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{
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float sidefrac = sidedef->segs[i]->sidefrac;
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if (sidefrac >= glseg.fracright) continue;
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if (sidefrac <= glseg.fracleft) break;
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cnt2++;
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}
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const bool splitBoth = !(flags & NOSPLIT_LOWER_UPPER);
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if (splitBoth) cnt2 <<= 1;
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cnt += cnt2;
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}
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vi = vertexes[1];
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if (glseg.fracright == 1 && vi != nullptr && vi->numheights)
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{
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int i = 0;
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while (i<vi->numheights && vi->heightlist[i] <= zbottom[1]) i++;
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while (i<vi->numheights && vi->heightlist[i] < ztop[1])
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{
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i++;
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cnt++;
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}
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}
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return cnt;
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}
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//==========================================================================
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//
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// build the vertices for this wall
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//
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//==========================================================================
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void GLWall::MakeVertices(HWDrawInfo *di, bool nosplit)
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{
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if (vertcount == 0)
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{
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bool split = (gl_seamless && !nosplit && seg->sidedef != nullptr && !(seg->sidedef->Flags & WALLF_POLYOBJ) && !(flags & GLWF_NOSPLIT));
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vertcount = split ? CountVertices() : 4;
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auto ret = di->AllocVertices(vertcount);
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vertindex = ret.second;
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CreateVertices(ret.first, split);
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}
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}
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