示例#1
0
void GLWall::RenderTextured(int rflags)
{
	int tmode = gl_RenderState.GetTextureMode();
	int rel = rellight + getExtraLight();

	if (flags & GLWF_GLOW)
	{
		gl_RenderState.EnableGlow(true);
		gl_RenderState.SetGlowPlanes(topplane, bottomplane);
		gl_RenderState.SetGlowParams(topglowcolor, bottomglowcolor);
	}
	gl_RenderState.SetMaterial(gltexture, flags & 3, 0, -1, false);

	if (type == RENDERWALL_M2SNF)
	{
		if (flags & GLT_CLAMPY)
		{
			if (tmode == TM_MODULATE) gl_RenderState.SetTextureMode(TM_CLAMPY);
		}
		gl_SetFog(255, 0, NULL, false);
	}

	float absalpha = fabsf(alpha);
	if (lightlist == NULL)
	{
		gl_SetColor(lightlevel, rel, Colormap, absalpha);
		if (type != RENDERWALL_M2SNF) gl_SetFog(lightlevel, rel, &Colormap, RenderStyle == STYLE_Add);
		RenderWall(rflags);
	}
	else
	{
		gl_RenderState.EnableSplit(true);

		for (unsigned i = 0; i < lightlist->Size(); i++)
		{
			secplane_t &lowplane = i == (*lightlist).Size() - 1 ? bottomplane : (*lightlist)[i + 1].plane;
			// this must use the exact same calculation method as GLWall::Process etc.
			float low1 = lowplane.ZatPoint(vertexes[0]);
			float low2 = lowplane.ZatPoint(vertexes[1]);

			if (low1 < ztop[0] || low2 < ztop[1])
			{
				int thisll = (*lightlist)[i].caster != NULL ? gl_ClampLight(*(*lightlist)[i].p_lightlevel) : lightlevel;
				FColormap thiscm;
				thiscm.FadeColor = Colormap.FadeColor;
				thiscm.CopyFrom3DLight(&(*lightlist)[i]);
				gl_SetColor(thisll, rel, thiscm, absalpha);
				if (type != RENDERWALL_M2SNF) gl_SetFog(thisll, rel, &thiscm, RenderStyle == STYLE_Add);
				gl_RenderState.SetSplitPlanes((*lightlist)[i].plane, lowplane);
				RenderWall(rflags);
			}
			if (low1 <= zbottom[0] && low2 <= zbottom[1]) break;
		}

		gl_RenderState.EnableSplit(false);
	}
	gl_RenderState.SetTextureMode(tmode);
	gl_RenderState.EnableGlow(false);
}
示例#2
0
//==========================================================================
//
// Draw the plane segment into the gap
//
//==========================================================================
void FDrawInfo::DrawFloodedPlane(wallseg * ws, float planez, sector_t * sec, bool ceiling)
{
	GLSectorPlane plane;
	int lightlevel;
	FColormap Colormap;
	FMaterial * gltexture;

	plane.GetFromSector(sec, ceiling);

	gltexture=FMaterial::ValidateTexture(plane.texture, true);
	if (!gltexture) return;

	if (gl_fixedcolormap) 
	{
		Colormap.Clear();
		lightlevel=255;
	}
	else
	{
		Colormap=sec->ColorMap;
		if (gltexture->tex->isFullbright())
		{
			Colormap.LightColor.r = Colormap.LightColor.g = Colormap.LightColor.b = 0xff;
			lightlevel=255;
		}
		else lightlevel=abs(ceiling? sec->GetCeilingLight() : sec->GetFloorLight());
	}

	int rel = getExtraLight();
	gl_SetColor(lightlevel, rel, Colormap, 1.0f);
	gl_SetFog(lightlevel, rel, &Colormap, false);
	gltexture->Bind();

	float fviewx = FIXED2FLOAT(viewx);
	float fviewy = FIXED2FLOAT(viewy);
	float fviewz = FIXED2FLOAT(viewz);

	gl_SetPlaneTextureRotation(&plane, gltexture);
	gl_RenderState.Apply();

	float prj_fac1 = (planez-fviewz)/(ws->z1-fviewz);
	float prj_fac2 = (planez-fviewz)/(ws->z2-fviewz);

	float px1 = fviewx + prj_fac1 * (ws->x1-fviewx);
	float py1 = fviewy + prj_fac1 * (ws->y1-fviewy);

	float px2 = fviewx + prj_fac2 * (ws->x1-fviewx);
	float py2 = fviewy + prj_fac2 * (ws->y1-fviewy);

	float px3 = fviewx + prj_fac2 * (ws->x2-fviewx);
	float py3 = fviewy + prj_fac2 * (ws->y2-fviewy);

	float px4 = fviewx + prj_fac1 * (ws->x2-fviewx);
	float py4 = fviewy + prj_fac1 * (ws->y2-fviewy);

	FFlatVertex *ptr = GLRenderer->mVBO->GetBuffer();
	ptr->Set(px1, planez, py1, px1 / 64, -py1 / 64);
	ptr++;
	ptr->Set(px2, planez, py2, px2 / 64, -py2 / 64);
	ptr++;
	ptr->Set(px3, planez, py3, px3 / 64, -py3 / 64);
	ptr++;
	ptr->Set(px4, planez, py4, px4 / 64, -py4 / 64);
	ptr++;
	GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);

	gl_RenderState.EnableTextureMatrix(false);
}
示例#3
0
//==========================================================================
//
// Draw the plane segment into the gap
//
//==========================================================================
void FDrawInfo::DrawFloodedPlane(wallseg * ws, float planez, sector_t * sec, bool ceiling)
{
	GLSectorPlane plane;
	int lightlevel;
	FColormap Colormap;
	FMaterial * gltexture;

	plane.GetFromSector(sec, ceiling);

	gltexture=FMaterial::ValidateTexture(plane.texture, true);
	if (!gltexture) return;

	if (gl_fixedcolormap) 
	{
		Colormap.GetFixedColormap();
		lightlevel=255;
	}
	else
	{
		Colormap=sec->ColorMap;
		if (gltexture->tex->isFullbright())
		{
			Colormap.LightColor.r = Colormap.LightColor.g = Colormap.LightColor.b = 0xff;
			lightlevel=255;
		}
		else lightlevel=abs(ceiling? sec->GetCeilingLight() : sec->GetFloorLight());
	}

	int rel = getExtraLight();
	gl_SetColor(lightlevel, rel, &Colormap, 1.0f);
	gl_SetFog(lightlevel, rel, &Colormap, false);
	gltexture->Bind(Colormap.colormap);

	float fviewx = FIXED2FLOAT(viewx);
	float fviewy = FIXED2FLOAT(viewy);
	float fviewz = FIXED2FLOAT(viewz);

	gl_RenderState.Apply();

	bool pushed = gl_SetPlaneTextureRotation(&plane, gltexture);

	glBegin(GL_TRIANGLE_FAN);
	float prj_fac1 = (planez-fviewz)/(ws->z1-fviewz);
	float prj_fac2 = (planez-fviewz)/(ws->z2-fviewz);

	float px1 = fviewx + prj_fac1 * (ws->x1-fviewx);
	float py1 = fviewy + prj_fac1 * (ws->y1-fviewy);

	float px2 = fviewx + prj_fac2 * (ws->x1-fviewx);
	float py2 = fviewy + prj_fac2 * (ws->y1-fviewy);

	float px3 = fviewx + prj_fac2 * (ws->x2-fviewx);
	float py3 = fviewy + prj_fac2 * (ws->y2-fviewy);

	float px4 = fviewx + prj_fac1 * (ws->x2-fviewx);
	float py4 = fviewy + prj_fac1 * (ws->y2-fviewy);

	glTexCoord2f(px1 / 64, -py1 / 64);
	glVertex3f(px1, planez, py1);

	glTexCoord2f(px2 / 64, -py2 / 64);
	glVertex3f(px2, planez, py2);

	glTexCoord2f(px3 / 64, -py3 / 64);
	glVertex3f(px3, planez, py3);

	glTexCoord2f(px4 / 64, -py4 / 64);
	glVertex3f(px4, planez, py4);

	glEnd();

	if (pushed)
	{
		glPopMatrix();
		glMatrixMode(GL_MODELVIEW);
	}
}
示例#4
0
//==========================================================================
//
// Draw the plane segment into the gap
//
//==========================================================================
void FDrawInfo::DrawFloodedPlane(wallseg * ws, float planez, sector_t * sec, bool ceiling)
{
	GLSectorPlane plane;
	int lightlevel;
	FColormap Colormap;
	FMaterial * gltexture;

	plane.GetFromSector(sec, ceiling);

	gltexture=FMaterial::ValidateTexture(plane.texture, false, true);
	if (!gltexture) return;

	if (gl_fixedcolormap) 
	{
		Colormap.Clear();
		lightlevel=255;
	}
	else
	{
		Colormap=sec->ColorMap;
		if (gltexture->tex->isFullbright())
		{
			Colormap.LightColor.r = Colormap.LightColor.g = Colormap.LightColor.b = 0xff;
			lightlevel=255;
		}
		else lightlevel=abs(ceiling? sec->GetCeilingLight() : sec->GetFloorLight());
	}

	int rel = getExtraLight();
	gl_SetColor(lightlevel, rel, Colormap, 1.0f);
	gl_SetFog(lightlevel, rel, &Colormap, false);
	gl_RenderState.SetMaterial(gltexture, CLAMP_NONE, 0, -1, false);

	float fviewx = ViewPos.X;
	float fviewy = ViewPos.Y;
	float fviewz = ViewPos.Z;

	gl_SetPlaneTextureRotation(&plane, gltexture);
	gl_RenderState.Apply();

	float prj_fac1 = (planez-fviewz)/(ws->z1-fviewz);
	float prj_fac2 = (planez-fviewz)/(ws->z2-fviewz);

	float px1 = fviewx + prj_fac1 * (ws->x1-fviewx);
	float py1 = fviewy + prj_fac1 * (ws->y1-fviewy);

	float px2 = fviewx + prj_fac2 * (ws->x1-fviewx);
	float py2 = fviewy + prj_fac2 * (ws->y1-fviewy);

	float px3 = fviewx + prj_fac2 * (ws->x2-fviewx);
	float py3 = fviewy + prj_fac2 * (ws->y2-fviewy);

	float px4 = fviewx + prj_fac1 * (ws->x2-fviewx);
	float py4 = fviewy + prj_fac1 * (ws->y2-fviewy);

	FQuadDrawer qd;
	qd.Set(0, px1, planez, py1, px1 / 64, -py1 / 64);
	qd.Set(1, px2, planez, py2, px2 / 64, -py2 / 64);
	qd.Set(2, px3, planez, py3, px3 / 64, -py3 / 64);
	qd.Set(3, px4, planez, py4, px4 / 64, -py4 / 64);
	qd.Render(GL_TRIANGLE_FAN);

	gl_RenderState.EnableTextureMatrix(false);
}
示例#5
0
//==========================================================================
//
// Draw the plane segment into the gap
//
//==========================================================================
void GLDrawInfo::DrawFloodedPlane(wallseg * ws, float planez, sector_t * sec, bool ceiling)
{
	GLSectorPlane plane;
	int lightlevel;
	FColormap Colormap;
	FGLTexture * gltexture;

	plane.GetFromSector(sec, ceiling);

	gltexture=FGLTexture::ValidateTexture(plane.texture);
	if (!gltexture) return;

	if (gl_fixedcolormap) 
	{
		Colormap.GetFixedColormap();
		lightlevel=255;
	}
	else
	{
		Colormap=sec->ColorMap;
		if (gltexture->tex->isFullbright())
		{
			Colormap.LightColor.r = Colormap.LightColor.g = Colormap.LightColor.b = 0xff;
			lightlevel=255;
		}
		else lightlevel=abs(ceiling? GetCeilingLight(sec) : GetFloorLight(sec));
	}

	int rel = extralight * gl_weaponlight;
	gl_SetColor(lightlevel, rel, &Colormap, 1.0f);
	gl_SetFog(lightlevel, rel, &Colormap, false);
	gltexture->Bind(Colormap.LightColor.a);
	gl_SetPlaneTextureRotation(&plane, gltexture);

	float fviewx = TO_GL(viewx);
	float fviewy = TO_GL(viewy);
	float fviewz = TO_GL(viewz);

	gl_ApplyShader();
	gl.Begin(GL_TRIANGLE_FAN);
	float prj_fac1 = (planez-fviewz)/(ws->z1-fviewz);
	float prj_fac2 = (planez-fviewz)/(ws->z2-fviewz);

	float px1 = fviewx + prj_fac1 * (ws->x1-fviewx);
	float py1 = fviewy + prj_fac1 * (ws->y1-fviewy);

	float px2 = fviewx + prj_fac2 * (ws->x1-fviewx);
	float py2 = fviewy + prj_fac2 * (ws->y1-fviewy);

	float px3 = fviewx + prj_fac2 * (ws->x2-fviewx);
	float py3 = fviewy + prj_fac2 * (ws->y2-fviewy);

	float px4 = fviewx + prj_fac1 * (ws->x2-fviewx);
	float py4 = fviewy + prj_fac1 * (ws->y2-fviewy);

	gl.TexCoord2f(px1 / 64, -py1 / 64);
	gl.Vertex3f(px1, planez, py1);

	gl.TexCoord2f(px2 / 64, -py2 / 64);
	gl.Vertex3f(px2, planez, py2);

	gl.TexCoord2f(px3 / 64, -py3 / 64);
	gl.Vertex3f(px3, planez, py3);

	gl.TexCoord2f(px4 / 64, -py4 / 64);
	gl.Vertex3f(px4, planez, py4);

	gl.End();

	gl.MatrixMode(GL_TEXTURE);
	gl.PopMatrix();
	gl.MatrixMode(GL_MODELVIEW);
}
示例#6
0
void FGLRenderer::DrawPlayerSprites(sector_t * viewsector, bool hudModelStep)
{
	bool brightflash = false;
	unsigned int i;
	int lightlevel=0;
	FColormap cm;
	sector_t * fakesec, fs;
	AActor * playermo=players[consoleplayer].camera;
	player_t * player=playermo->player;
	
	// this is the same as the software renderer
	if (!player ||
		!r_drawplayersprites ||
		!camera->player ||
		(player->cheats & CF_CHASECAM) || 
		(r_deathcamera && camera->health <= 0))
		return;

	float bobx, boby, wx, wy;
	DPSprite *weapon;

	P_BobWeapon(camera->player, &bobx, &boby, r_TicFracF);

	// Interpolate the main weapon layer once so as to be able to add it to other layers.
	if ((weapon = camera->player->FindPSprite(PSP_WEAPON)) != nullptr)
	{
		if (weapon->firstTic)
		{
			wx = weapon->x;
			wy = weapon->y;
		}
		else
		{
			wx = weapon->oldx + (weapon->x - weapon->oldx) * r_TicFracF;
			wy = weapon->oldy + (weapon->y - weapon->oldy) * r_TicFracF;
		}
	}
	else
	{
		wx = 0;
		wy = 0;
	}

	if (gl_fixedcolormap) 
	{
		lightlevel=255;
		cm.Clear();
		fakesec = viewsector;
	}
	else
	{
		fakesec    = gl_FakeFlat(viewsector, &fs, false);

		// calculate light level for weapon sprites
		lightlevel = gl_ClampLight(fakesec->lightlevel);

		// calculate colormap for weapon sprites
		if (viewsector->e->XFloor.ffloors.Size() && !glset.nocoloredspritelighting)
		{
			TArray<lightlist_t> & lightlist = viewsector->e->XFloor.lightlist;
			for(i=0;i<lightlist.Size();i++)
			{
				double lightbottom;

				if (i<lightlist.Size()-1) 
				{
					lightbottom=lightlist[i+1].plane.ZatPoint(ViewPos);
				}
				else 
				{
					lightbottom=viewsector->floorplane.ZatPoint(ViewPos);
				}

				if (lightbottom<player->viewz) 
				{
					cm = lightlist[i].extra_colormap;
					lightlevel = gl_ClampLight(*lightlist[i].p_lightlevel);
					break;
				}
			}
		}
		else 
		{
			cm=fakesec->ColorMap;
			if (glset.nocoloredspritelighting) cm.ClearColor();
		}

		lightlevel = gl_CalcLightLevel(lightlevel, getExtraLight(), true);

		if (glset.lightmode == 8)
		{
			// Korshun: the way based on max possible light level for sector like in software renderer.
			float min_L = 36.0 / 31.0 - ((lightlevel / 255.0) * (63.0 / 31.0)); // Lightlevel in range 0-63
			if (min_L < 0)
				min_L = 0;
			else if (min_L > 1.0)
				min_L = 1.0;

			lightlevel = (1.0 - min_L) * 255;
		}
		else
		{
			lightlevel = (2 * lightlevel + 255) / 3;
		}
		lightlevel = gl_CheckSpriteGlow(viewsector, lightlevel, playermo->Pos());

	}
	
	// Korshun: fullbright fog in opengl, render weapon sprites fullbright (but don't cancel out the light color!)
	if (glset.brightfog && ((level.flags&LEVEL_HASFADETABLE) || cm.FadeColor != 0))
	{
		lightlevel = 255;
	}

	PalEntry ThingColor = (playermo->RenderStyle.Flags & STYLEF_ColorIsFixed) ? playermo->fillcolor : 0xffffff;
	ThingColor.a = 255;

	visstyle_t vis;

	vis.RenderStyle=playermo->RenderStyle;
	vis.Alpha=playermo->Alpha;
	vis.colormap = NULL;
	if (playermo->Inventory) 
	{
		playermo->Inventory->AlterWeaponSprite(&vis);
		if (vis.colormap >= SpecialColormaps[0].Colormap && 
			vis.colormap < SpecialColormaps[SpecialColormaps.Size()].Colormap && 
			gl_fixedcolormap == CM_DEFAULT)
		{
			// this only happens for Strife's inverted weapon sprite
			vis.RenderStyle.Flags |= STYLEF_InvertSource;
		}
	}

	// Set the render parameters

	int OverrideShader = -1;
	float trans = 0.f;
	if (vis.RenderStyle.BlendOp >= STYLEOP_Fuzz && vis.RenderStyle.BlendOp <= STYLEOP_FuzzOrRevSub)
	{
		vis.RenderStyle.CheckFuzz();
		if (vis.RenderStyle.BlendOp == STYLEOP_Fuzz)
		{
			if (gl_fuzztype != 0)
			{
				// Todo: implement shader selection here
				vis.RenderStyle = LegacyRenderStyles[STYLE_Translucent];
				OverrideShader = gl_fuzztype + 4;
				trans = 0.99f;	// trans may not be 1 here
			}
			else
			{
				vis.RenderStyle.BlendOp = STYLEOP_Shadow;
			}
		}
	}

	gl_SetRenderStyle(vis.RenderStyle, false, false);

	if (vis.RenderStyle.Flags & STYLEF_TransSoulsAlpha)
	{
		trans = transsouls;
	}
	else if (vis.RenderStyle.Flags & STYLEF_Alpha1)
	{
		trans = 1.f;
	}
	else if (trans == 0.f)
	{
		trans = vis.Alpha;
	}

	// now draw the different layers of the weapon
	gl_RenderState.EnableBrightmap(true);
	gl_RenderState.SetObjectColor(ThingColor);
	gl_RenderState.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	gl_RenderState.AlphaFunc(GL_GEQUAL, gl_mask_sprite_threshold);
	gl_RenderState.BlendEquation(GL_FUNC_ADD);

	// hack alert! Rather than changing everything in the underlying lighting code let's just temporarily change
	// light mode here to draw the weapon sprite.
	int oldlightmode = glset.lightmode;
	if (glset.lightmode == 8) glset.lightmode = 2;

	for(DPSprite *psp = player->psprites; psp != nullptr && psp->GetID() < PSP_TARGETCENTER; psp = psp->GetNext())
	{
		if (psp->GetState() != nullptr) 
		{
			FColormap cmc = cm;
			int ll = lightlevel;
			if (isBright(psp)) 
			{
				if (fakesec == viewsector || in_area != area_below)	
				{
					cmc.LightColor.r=
					cmc.LightColor.g=
					cmc.LightColor.b=0xff;
				}
				else
				{
					// under water areas keep most of their color for fullbright objects
					cmc.LightColor.r = (3 * cmc.LightColor.r + 0xff) / 4;
					cmc.LightColor.g = (3*cmc.LightColor.g + 0xff)/4;
					cmc.LightColor.b = (3*cmc.LightColor.b + 0xff)/4;
				}
				ll = 255;
			}
			// set the lighting parameters
			if (vis.RenderStyle.BlendOp == STYLEOP_Shadow)
			{
				gl_RenderState.SetColor(0.2f, 0.2f, 0.2f, 0.33f, cmc.desaturation);
			}
			else
			{
				if (gl_lights && GLRenderer->mLightCount && !gl_fixedcolormap && gl_light_sprites)
				{
					gl_SetDynSpriteLight(playermo, NULL);
				}
				gl_SetColor(ll, 0, cmc, trans, true);
			}

			if (psp->firstTic)
			{ // Can't interpolate the first tic.
				psp->firstTic = false;
				psp->oldx = psp->x;
				psp->oldy = psp->y;
			}

			float sx = psp->oldx + (psp->x - psp->oldx) * r_TicFracF;
			float sy = psp->oldy + (psp->y - psp->oldy) * r_TicFracF;

			if (psp->Flags & PSPF_ADDBOB)
			{
				sx += bobx;
				sy += boby;
			}

			if (psp->Flags & PSPF_ADDWEAPON && psp->GetID() != PSP_WEAPON)
			{
				sx += wx;
				sy += wy;
			}


			DrawPSprite(player, psp, sx, sy, hudModelStep, OverrideShader, !!(vis.RenderStyle.Flags & STYLEF_RedIsAlpha));
		}
	}
	gl_RenderState.SetObjectColor(0xffffffff);
	gl_RenderState.SetDynLight(0, 0, 0);
	gl_RenderState.EnableBrightmap(false);
	glset.lightmode = oldlightmode;
}
示例#7
0
//==========================================================================
//
//
//
//==========================================================================
void GLWall::DrawDecal(DBaseDecal *decal)
{
	line_t * line=seg->linedef;
	side_t * side=seg->sidedef;
	int i;
	float zpos;
	int light;
	int rel;
	float a;
	bool flipx, flipy;
	DecalVertex dv[4];
	FTextureID decalTile;
	

	if (decal->RenderFlags & RF_INVISIBLE) return;
	if (type==RENDERWALL_FFBLOCK && gltexture->isMasked()) return;	// No decals on 3D floors with transparent textures.

	//if (decal->sprite != 0xffff)
	{
		decalTile = decal->PicNum;
		flipx = !!(decal->RenderFlags & RF_XFLIP);
		flipy = !!(decal->RenderFlags & RF_YFLIP);
	}
	/*
	else
	{
	decalTile = SpriteFrames[sprites[decal->sprite].spriteframes + decal->frame].lump[0];
	flipx = SpriteFrames[sprites[decal->sprite].spriteframes + decal->frame].flip & 1;
	}
	*/

	FTexture *texture = TexMan[decalTile];
	if (texture == NULL) return;

	FMaterial *tex;


	tex = FMaterial::ValidateTexture(texture, true);


	// the sectors are only used for their texture origin coordinates
	// so we don't need the fake sectors for deep water etc.
	// As this is a completely split wall fragment no further splits are
	// necessary for the decal.
	sector_t *frontsector;

	// for 3d-floor segments use the model sector as reference
	if ((decal->RenderFlags&RF_CLIPMASK)==RF_CLIPMID) frontsector=decal->Sector;
	else frontsector=seg->frontsector;

	switch (decal->RenderFlags & RF_RELMASK)
	{
	default:
		// No valid decal can have this type. If one is encountered anyway
		// it is in some way invalid so skip it.
		return;
		//zpos = decal->z;
		//break;

	case RF_RELUPPER:
		if (type!=RENDERWALL_TOP) return;
		if (line->flags & ML_DONTPEGTOP)
		{
			zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
		}
		else
		{
			zpos = decal->Z + seg->backsector->GetPlaneTexZ(sector_t::ceiling);
		}
		break;
	case RF_RELLOWER:
		if (type!=RENDERWALL_BOTTOM) return;
		if (line->flags & ML_DONTPEGBOTTOM)
		{
			zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
		}
		else
		{
			zpos = decal->Z + seg->backsector->GetPlaneTexZ(sector_t::floor);
		}
		break;
	case RF_RELMID:
		if (type==RENDERWALL_TOP || type==RENDERWALL_BOTTOM) return;
		if (line->flags & ML_DONTPEGBOTTOM)
		{
			zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::floor);
		}
		else
		{
			zpos = decal->Z + frontsector->GetPlaneTexZ(sector_t::ceiling);
		}
	}
	
	if (decal->RenderFlags & RF_FULLBRIGHT)
	{
		light = 255;
		rel = 0;
	}
	else
	{
		light = lightlevel;
		rel = rellight + getExtraLight();
	}
	
	FColormap p = Colormap;
	
	if (glset.nocoloredspritelighting)
	{
		p.Decolorize();
	}
	
	
	
	a = decal->Alpha;
	
	// now clip the decal to the actual polygon
	float decalwidth = tex->TextureWidth()  * decal->ScaleX;
	float decalheight= tex->TextureHeight() * decal->ScaleY;
	float decallefto = tex->GetLeftOffset() * decal->ScaleX;
	float decaltopo  = tex->GetTopOffset()  * decal->ScaleY;

	
	float leftedge = glseg.fracleft * side->TexelLength;
	float linelength = glseg.fracright * side->TexelLength - leftedge;

	// texel index of the decal's left edge
	float decalpixpos = (float)side->TexelLength * decal->LeftDistance - (flipx? decalwidth-decallefto : decallefto) - leftedge;

	float left,right;
	float lefttex,righttex;

	// decal is off the left edge
	if (decalpixpos < 0)
	{
		left = 0;
		lefttex = -decalpixpos;
	}
	else
	{
		left = decalpixpos;
		lefttex = 0;
	}
	
	// decal is off the right edge
	if (decalpixpos + decalwidth > linelength)
	{
		right = linelength;
		righttex = right - decalpixpos;
	}
	else
	{
		right = decalpixpos + decalwidth;
		righttex = decalwidth;
	}
	if (right<=left) return;	// nothing to draw

	// one texture unit on the wall as vector
	float vx=(glseg.x2-glseg.x1)/linelength;
	float vy=(glseg.y2-glseg.y1)/linelength;
		
	dv[1].x=dv[0].x=glseg.x1+vx*left;
	dv[1].y=dv[0].y=glseg.y1+vy*left;

	dv[3].x=dv[2].x=glseg.x1+vx*right;
	dv[3].y=dv[2].y=glseg.y1+vy*right;
		
	zpos+= (flipy? decalheight-decaltopo : decaltopo);

	dv[1].z=dv[2].z = zpos;
	dv[0].z=dv[3].z = dv[1].z - decalheight;
	dv[1].v=dv[2].v = tex->GetVT();

	dv[1].u=dv[0].u = tex->GetU(lefttex / decal->ScaleX);
	dv[3].u=dv[2].u = tex->GetU(righttex / decal->ScaleX);
	dv[0].v=dv[3].v = tex->GetVB();


	// now clip to the top plane
	float vzt=(ztop[1]-ztop[0])/linelength;
	float topleft=this->ztop[0]+vzt*left;
	float topright=this->ztop[0]+vzt*right;

	// completely below the wall
	if (topleft<dv[0].z && topright<dv[3].z) 
		return;

	if (topleft<dv[1].z || topright<dv[2].z)
	{
		// decal has to be clipped at the top
		// let texture clamping handle all extreme cases
		dv[1].v=(dv[1].z-topleft)/(dv[1].z-dv[0].z)*dv[0].v;
		dv[2].v=(dv[2].z-topright)/(dv[2].z-dv[3].z)*dv[3].v;
		dv[1].z=topleft;
		dv[2].z=topright;
	}

	// now clip to the bottom plane
	float vzb=(zbottom[1]-zbottom[0])/linelength;
	float bottomleft=this->zbottom[0]+vzb*left;
	float bottomright=this->zbottom[0]+vzb*right;

	// completely above the wall
	if (bottomleft>dv[1].z && bottomright>dv[2].z) 
		return;

	if (bottomleft>dv[0].z || bottomright>dv[3].z)
	{
		// decal has to be clipped at the bottom
		// let texture clamping handle all extreme cases
		dv[0].v=(dv[1].z-bottomleft)/(dv[1].z-dv[0].z)*(dv[0].v-dv[1].v) + dv[1].v;
		dv[3].v=(dv[2].z-bottomright)/(dv[2].z-dv[3].z)*(dv[3].v-dv[2].v) + dv[2].v;
		dv[0].z=bottomleft;
		dv[3].z=bottomright;
	}


	if (flipx)
	{
		float ur = tex->GetUR();
		for(i=0;i<4;i++) dv[i].u=ur-dv[i].u;
	}
	if (flipy)
	{
		float vb = tex->GetVB();
		for(i=0;i<4;i++) dv[i].v=vb-dv[i].v;
	}

	// calculate dynamic light effect.
	if (gl_lights && GLRenderer->mLightCount && !gl_fixedcolormap && gl_light_sprites)
	{
		// Note: This should be replaced with proper shader based lighting.
		double x, y;
		decal->GetXY(seg->sidedef, x, y);
		gl_SetDynSpriteLight(NULL, x, y, zpos, sub);
	}

	// alpha color only has an effect when using an alpha texture.
	if (decal->RenderStyle.Flags & STYLEF_RedIsAlpha)
	{
		gl_RenderState.SetObjectColor(decal->AlphaColor|0xff000000);
	}




	gl_SetRenderStyle(decal->RenderStyle, false, false);
	gl_RenderState.SetMaterial(tex, CLAMP_XY, decal->Translation, 0, !!(decal->RenderStyle.Flags & STYLEF_RedIsAlpha));


	// If srcalpha is one it looks better with a higher alpha threshold
	if (decal->RenderStyle.SrcAlpha == STYLEALPHA_One) gl_RenderState.AlphaFunc(GL_GEQUAL, gl_mask_sprite_threshold);
	else gl_RenderState.AlphaFunc(GL_GREATER, 0.f);


	gl_SetColor(light, rel, p, a);
	// for additively drawn decals we must temporarily set the fog color to black.
	PalEntry fc = gl_RenderState.GetFogColor();
	if (decal->RenderStyle.BlendOp == STYLEOP_Add && decal->RenderStyle.DestAlpha == STYLEALPHA_One)
	{
		gl_RenderState.SetFog(0,-1);
	}

	FQuadDrawer qd;
	for (i = 0; i < 4; i++)
	{
		qd.Set(i, dv[i].x, dv[i].z, dv[i].y, dv[i].u, dv[i].v);
	}

	if (lightlist == NULL)
	{
		gl_RenderState.Apply();
		qd.Render(GL_TRIANGLE_FAN);
	}
	else
	{
		for (unsigned k = 0; k < lightlist->Size(); k++)
		{
			secplane_t &lowplane = k == (*lightlist).Size() - 1 ? bottomplane : (*lightlist)[k + 1].plane;

			float low1 = lowplane.ZatPoint(dv[1].x, dv[1].y);
			float low2 = lowplane.ZatPoint(dv[2].x, dv[2].y);

			if (low1 < dv[1].z || low2 < dv[2].z)
			{
				int thisll = (*lightlist)[k].caster != NULL ? gl_ClampLight(*(*lightlist)[k].p_lightlevel) : lightlevel;
				FColormap thiscm;
				thiscm.FadeColor = Colormap.FadeColor;
				thiscm.CopyFrom3DLight(&(*lightlist)[k]);
				gl_SetColor(thisll, rel, thiscm, a);
				if (glset.nocoloredspritelighting) thiscm.Decolorize();
				gl_SetFog(thisll, rel, &thiscm, RenderStyle == STYLE_Add);
				gl_RenderState.SetSplitPlanes((*lightlist)[k].plane, lowplane);

				gl_RenderState.Apply();
				qd.Render(GL_TRIANGLE_FAN);
			}
			if (low1 <= dv[0].z && low2 <= dv[3].z) break;
		}
	}

	rendered_decals++;
	gl_RenderState.SetTextureMode(TM_MODULATE);
	gl_RenderState.SetObjectColor(0xffffffff);
	gl_RenderState.SetFog(fc,-1);
	gl_RenderState.SetDynLight(0,0,0);
}