mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-12-24 03:11:14 +00:00
7cbe8669b6
- fix decal light not being calculated from the center of the decal
400 lines
10 KiB
C++
400 lines
10 KiB
C++
//
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//---------------------------------------------------------------------------
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//
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// Copyright(C) 2003-2016 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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/*
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** gl_decal.cpp
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** OpenGL decal rendering code
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**
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*/
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#include "doomdata.h"
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#include "gl/system/gl_system.h"
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#include "a_sharedglobal.h"
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#include "r_utility.h"
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#include "g_levellocals.h"
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#include "gl/system/gl_cvars.h"
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#include "gl/data/gl_data.h"
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#include "gl/data/gl_vertexbuffer.h"
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#include "gl/renderer/gl_renderer.h"
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#include "gl/renderer/gl_lightdata.h"
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#include "gl/renderer/gl_renderstate.h"
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#include "gl/scene/gl_drawinfo.h"
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#include "gl/scene/gl_scenedrawer.h"
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#include "gl/shaders/gl_shader.h"
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#include "gl/textures/gl_texture.h"
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#include "gl/textures/gl_material.h"
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#include "gl/utility/gl_clock.h"
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#include "gl/renderer/gl_quaddrawer.h"
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struct DecalVertex
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{
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float x,y,z;
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float u,v;
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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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void GLWall::DrawDecal(DBaseDecal *decal)
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{
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line_t * line=seg->linedef;
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side_t * side=seg->sidedef;
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int i;
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float zpos;
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int light;
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int rel;
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float a;
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bool flipx, flipy;
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DecalVertex dv[4];
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FTextureID decalTile;
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if (decal->RenderFlags & RF_INVISIBLE) return;
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if (type==RENDERWALL_FFBLOCK && gltexture->isMasked()) return; // No decals on 3D floors with transparent textures.
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//if (decal->sprite != 0xffff)
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{
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decalTile = decal->PicNum;
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flipx = !!(decal->RenderFlags & RF_XFLIP);
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flipy = !!(decal->RenderFlags & RF_YFLIP);
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}
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/*
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else
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{
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decalTile = SpriteFrames[sprites[decal->sprite].spriteframes + decal->frame].lump[0];
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flipx = SpriteFrames[sprites[decal->sprite].spriteframes + decal->frame].flip & 1;
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}
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*/
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FTexture *texture = TexMan[decalTile];
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if (texture == NULL) return;
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FMaterial *tex;
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tex = FMaterial::ValidateTexture(texture, true);
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// the sectors are only used for their texture origin coordinates
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// so we don't need the fake sectors for deep water etc.
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// As this is a completely split wall fragment no further splits are
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// necessary for the decal.
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sector_t *frontsector;
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// for 3d-floor segments use the model sector as reference
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if ((decal->RenderFlags&RF_CLIPMASK)==RF_CLIPMID) frontsector=decal->Sector;
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else frontsector=seg->frontsector;
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switch (decal->RenderFlags & RF_RELMASK)
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{
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default:
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// No valid decal can have this type. If one is encountered anyway
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// it is in some way invalid so skip it.
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return;
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//zpos = decal->z;
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//break;
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case RF_RELUPPER:
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if (type!=RENDERWALL_TOP) return;
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if (line->flags & ML_DONTPEGTOP)
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{
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zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
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}
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else
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{
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zpos = decal->Z + seg->backsector->GetPlaneTexZ(sector_t::ceiling);
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}
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break;
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case RF_RELLOWER:
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if (type!=RENDERWALL_BOTTOM) return;
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if (line->flags & ML_DONTPEGBOTTOM)
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{
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zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
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}
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else
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{
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zpos = decal->Z + seg->backsector->GetPlaneTexZ(sector_t::floor);
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}
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break;
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case RF_RELMID:
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if (type==RENDERWALL_TOP || type==RENDERWALL_BOTTOM) return;
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if (line->flags & ML_DONTPEGBOTTOM)
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{
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zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::floor);
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}
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else
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{
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zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
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}
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}
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if (decal->RenderFlags & RF_FULLBRIGHT)
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{
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light = 255;
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rel = 0;
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}
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else
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{
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light = lightlevel;
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rel = rellight + getExtraLight();
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}
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FColormap p = Colormap;
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if (level.flags3 & LEVEL3_NOCOLOREDSPRITELIGHTING)
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{
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p.Decolorize();
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}
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a = decal->Alpha;
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// now clip the decal to the actual polygon
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float decalwidth = tex->TextureWidth() * decal->ScaleX;
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float decalheight= tex->TextureHeight() * decal->ScaleY;
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float decallefto = tex->GetLeftOffset() * decal->ScaleX;
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float decaltopo = tex->GetTopOffset() * decal->ScaleY;
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float leftedge = glseg.fracleft * side->TexelLength;
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float linelength = glseg.fracright * side->TexelLength - leftedge;
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// texel index of the decal's left edge
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float decalpixpos = (float)side->TexelLength * decal->LeftDistance - (flipx? decalwidth-decallefto : decallefto) - leftedge;
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float left,right;
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float lefttex,righttex;
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// decal is off the left edge
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if (decalpixpos < 0)
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{
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left = 0;
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lefttex = -decalpixpos;
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}
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else
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{
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left = decalpixpos;
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lefttex = 0;
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}
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// decal is off the right edge
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if (decalpixpos + decalwidth > linelength)
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{
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right = linelength;
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righttex = right - decalpixpos;
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}
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else
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{
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right = decalpixpos + decalwidth;
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righttex = decalwidth;
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}
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if (right<=left) return; // nothing to draw
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// one texture unit on the wall as vector
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float vx=(glseg.x2-glseg.x1)/linelength;
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float vy=(glseg.y2-glseg.y1)/linelength;
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dv[1].x=dv[0].x=glseg.x1+vx*left;
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dv[1].y=dv[0].y=glseg.y1+vy*left;
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dv[3].x=dv[2].x=glseg.x1+vx*right;
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dv[3].y=dv[2].y=glseg.y1+vy*right;
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zpos+= (flipy? decalheight-decaltopo : decaltopo);
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dv[1].z=dv[2].z = zpos;
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dv[0].z=dv[3].z = dv[1].z - decalheight;
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dv[1].v=dv[2].v = tex->GetVT();
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dv[1].u=dv[0].u = tex->GetU(lefttex / decal->ScaleX);
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dv[3].u=dv[2].u = tex->GetU(righttex / decal->ScaleX);
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dv[0].v=dv[3].v = tex->GetVB();
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// now clip to the top plane
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float vzt=(ztop[1]-ztop[0])/linelength;
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float topleft=this->ztop[0]+vzt*left;
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float topright=this->ztop[0]+vzt*right;
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// completely below the wall
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if (topleft<dv[0].z && topright<dv[3].z)
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return;
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if (topleft<dv[1].z || topright<dv[2].z)
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{
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// decal has to be clipped at the top
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// let texture clamping handle all extreme cases
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dv[1].v=(dv[1].z-topleft)/(dv[1].z-dv[0].z)*dv[0].v;
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dv[2].v=(dv[2].z-topright)/(dv[2].z-dv[3].z)*dv[3].v;
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dv[1].z=topleft;
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dv[2].z=topright;
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}
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// now clip to the bottom plane
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float vzb=(zbottom[1]-zbottom[0])/linelength;
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float bottomleft=this->zbottom[0]+vzb*left;
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float bottomright=this->zbottom[0]+vzb*right;
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// completely above the wall
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if (bottomleft>dv[1].z && bottomright>dv[2].z)
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return;
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if (bottomleft>dv[0].z || bottomright>dv[3].z)
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{
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// decal has to be clipped at the bottom
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// let texture clamping handle all extreme cases
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dv[0].v=(dv[1].z-bottomleft)/(dv[1].z-dv[0].z)*(dv[0].v-dv[1].v) + dv[1].v;
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dv[3].v=(dv[2].z-bottomright)/(dv[2].z-dv[3].z)*(dv[3].v-dv[2].v) + dv[2].v;
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dv[0].z=bottomleft;
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dv[3].z=bottomright;
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}
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if (flipx)
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{
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float ur = tex->GetUR();
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for(i=0;i<4;i++) dv[i].u=ur-dv[i].u;
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}
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if (flipy)
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{
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float vb = tex->GetVB();
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for(i=0;i<4;i++) dv[i].v=vb-dv[i].v;
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}
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// calculate dynamic light effect.
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if (gl_lights && GLRenderer->mLightCount && !mDrawer->FixedColormap && gl_light_sprites)
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{
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// Note: This should be replaced with proper shader based lighting.
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double x, y;
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decal->GetXY(seg->sidedef, x, y);
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gl_SetDynSpriteLight(nullptr, x, y, zpos - decalheight * 0.5f, sub);
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}
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// alpha color only has an effect when using an alpha texture.
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if (decal->RenderStyle.Flags & STYLEF_RedIsAlpha)
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{
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gl_RenderState.SetObjectColor(decal->AlphaColor|0xff000000);
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}
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gl_SetRenderStyle(decal->RenderStyle, false, false);
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gl_RenderState.SetMaterial(tex, CLAMP_XY, decal->Translation, 0, !!(decal->RenderStyle.Flags & STYLEF_RedIsAlpha));
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// If srcalpha is one it looks better with a higher alpha threshold
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if (decal->RenderStyle.SrcAlpha == STYLEALPHA_One) gl_RenderState.AlphaFunc(GL_GEQUAL, gl_mask_sprite_threshold);
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else gl_RenderState.AlphaFunc(GL_GREATER, 0.f);
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mDrawer->SetColor(light, rel, p, a);
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// for additively drawn decals we must temporarily set the fog color to black.
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PalEntry fc = gl_RenderState.GetFogColor();
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if (decal->RenderStyle.BlendOp == STYLEOP_Add && decal->RenderStyle.DestAlpha == STYLEALPHA_One)
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{
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gl_RenderState.SetFog(0,-1);
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}
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gl_RenderState.SetNormal(glseg.Normal());
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FQuadDrawer qd;
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for (i = 0; i < 4; i++)
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{
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qd.Set(i, dv[i].x, dv[i].z, dv[i].y, dv[i].u, dv[i].v);
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}
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if (lightlist == NULL)
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{
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gl_RenderState.Apply();
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qd.Render(GL_TRIANGLE_FAN);
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}
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else
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{
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for (unsigned k = 0; k < lightlist->Size(); k++)
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{
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secplane_t &lowplane = k == (*lightlist).Size() - 1 ? bottomplane : (*lightlist)[k + 1].plane;
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float low1 = lowplane.ZatPoint(dv[1].x, dv[1].y);
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float low2 = lowplane.ZatPoint(dv[2].x, dv[2].y);
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if (low1 < dv[1].z || low2 < dv[2].z)
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{
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int thisll = (*lightlist)[k].caster != NULL ? gl_ClampLight(*(*lightlist)[k].p_lightlevel) : lightlevel;
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FColormap thiscm;
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thiscm.FadeColor = Colormap.FadeColor;
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thiscm.CopyFrom3DLight(&(*lightlist)[k]);
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mDrawer->SetColor(thisll, rel, thiscm, a);
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if (level.flags3 & LEVEL3_NOCOLOREDSPRITELIGHTING) thiscm.Decolorize();
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mDrawer->SetFog(thisll, rel, &thiscm, RenderStyle == STYLE_Add);
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gl_RenderState.SetSplitPlanes((*lightlist)[k].plane, lowplane);
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gl_RenderState.Apply();
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qd.Render(GL_TRIANGLE_FAN);
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}
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if (low1 <= dv[0].z && low2 <= dv[3].z) break;
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}
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}
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rendered_decals++;
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gl_RenderState.SetTextureMode(TM_MODULATE);
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gl_RenderState.SetObjectColor(0xffffffff);
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gl_RenderState.SetFog(fc,-1);
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gl_RenderState.SetDynLight(0,0,0);
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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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void GLWall::DoDrawDecals()
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{
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if (seg->sidedef && seg->sidedef->AttachedDecals)
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{
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if (lightlist != NULL)
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{
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gl_RenderState.EnableSplit(true);
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}
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else
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{
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mDrawer->SetFog(lightlevel, rellight + getExtraLight(), &Colormap, false);
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}
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DBaseDecal *decal = seg->sidedef->AttachedDecals;
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while (decal)
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{
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DrawDecal(decal);
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decal = decal->WallNext;
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}
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if (lightlist != NULL)
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{
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gl_RenderState.EnableSplit(false);
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}
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}
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}
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