/* ** gl_light.cpp ** Light level / fog management / dynamic lights ** **--------------------------------------------------------------------------- ** Copyright 2002-2005 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 "gl/system/gl_system.h" #include "gl/system/gl_interface.h" #include "gl/system/gl_cvars.h" #include "gl/data/gl_data.h" #include "gl/renderer/gl_colormap.h" #include "gl/renderer/gl_lightdata.h" #include "gl/renderer/gl_renderstate.h" #include "gl/shaders/gl_shader.h" #include "gl/scene/gl_portal.h" #include "c_dispatch.h" #include "p_local.h" #include "g_level.h" #include "r_sky.h" // externally settable lighting properties static float distfogtable[2][256]; // light to fog conversion table for black fog static PalEntry outsidefogcolor; int fogdensity; int outsidefogdensity; int skyfog; CUSTOM_CVAR (Int, gl_light_ambient, 20, CVAR_ARCHIVE | CVAR_GLOBALCONFIG) { // ambient of 0 does not work correctly because light level 0 is special. if (self < 1) self = 1; } CVAR(Int, gl_weaponlight, 8, CVAR_ARCHIVE); CUSTOM_CVAR(Bool, gl_enhanced_nightvision, true, CVAR_ARCHIVE|CVAR_NOINITCALL) { // The fixed colormap state needs to be reset because if this happens when // a shader is set to CM_LITE or CM_TORCH it won't register the change in behavior caused by this CVAR. GLRenderer->mShaderManager->ResetFixedColormap(); } CVAR(Bool, gl_brightfog, false, CVAR_ARCHIVE); //========================================================================== // // Sets up the fog tables // //========================================================================== CUSTOM_CVAR (Int, gl_distfog, 70, CVAR_ARCHIVE | CVAR_GLOBALCONFIG) { for (int i=0;i<256;i++) { if (i<164) { distfogtable[0][i]= (gl_distfog>>1) + (gl_distfog)*(164-i)/164; } else if (i<230) { distfogtable[0][i]= (gl_distfog>>1) - (gl_distfog>>1)*(i-164)/(230-164); } else distfogtable[0][i]=0; if (i<128) { distfogtable[1][i]= 6.f + (gl_distfog>>1) + (gl_distfog)*(128-i)/48; } else if (i<216) { distfogtable[1][i]= (216.f-i) / ((216.f-128.f)) * gl_distfog / 10; } else distfogtable[1][i]=0; } } CUSTOM_CVAR(Int,gl_fogmode,1,CVAR_ARCHIVE|CVAR_NOINITCALL) { if (self>2) self=2; if (self<0) self=0; } CUSTOM_CVAR(Int, gl_lightmode, 3 ,CVAR_ARCHIVE|CVAR_NOINITCALL) { int newself = self; if (newself > 4) newself=8; // use 8 for software lighting to avoid conflicts with the bit mask if (newself < 0) newself=0; if (self != newself) self = newself; glset.lightmode = newself; } //========================================================================== // // Sets render state to draw the given render style // includes: Texture mode, blend equation and blend mode // //========================================================================== void gl_GetRenderStyle(FRenderStyle style, bool drawopaque, bool allowcolorblending, int *tm, int *sb, int *db, int *be) { static int blendstyles[] = { GL_ZERO, GL_ONE, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA }; static int renderops[] = { 0, GL_FUNC_ADD, GL_FUNC_SUBTRACT, GL_FUNC_REVERSE_SUBTRACT, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; int srcblend = blendstyles[style.SrcAlpha&3]; int dstblend = blendstyles[style.DestAlpha&3]; int blendequation = renderops[style.BlendOp&15]; int texturemode = drawopaque? TM_OPAQUE : TM_MODULATE; if (style.Flags & STYLEF_RedIsAlpha) { texturemode = TM_REDTOALPHA; } else if (style.Flags & STYLEF_ColorIsFixed) { texturemode = TM_MASK; } else if (style.Flags & STYLEF_InvertSource) { // The only place where InvertSource is used is for inverted sprites with the infrared powerup. texturemode = TM_INVERSE; } if (blendequation == -1) { srcblend = GL_DST_COLOR; dstblend = GL_ONE_MINUS_SRC_ALPHA; blendequation = GL_FUNC_ADD; } if (allowcolorblending && srcblend == GL_SRC_ALPHA && dstblend == GL_ONE && blendequation == GL_FUNC_ADD) { srcblend = GL_SRC_COLOR; } *tm = texturemode; *be = blendequation; *sb = srcblend; *db = dstblend; } //========================================================================== // // Set fog parameters for the level // //========================================================================== void gl_SetFogParams(int _fogdensity, PalEntry _outsidefogcolor, int _outsidefogdensity, int _skyfog) { fogdensity=_fogdensity; outsidefogcolor=_outsidefogcolor; outsidefogdensity=_outsidefogdensity; skyfog=_skyfog; outsidefogdensity>>=1; fogdensity>>=1; } //========================================================================== // // Get current light level // //========================================================================== int gl_CalcLightLevel(int lightlevel, int rellight, bool weapon) { int light; if (lightlevel == 0) return 0; if ((glset.lightmode & 2) && lightlevel < 192 && !weapon) { light = xs_CRoundToInt(192.f - (192-lightlevel)* 1.95f); } else { light=lightlevel; } if (light>=1; } return clamp(light+rellight, 0, 255); } //========================================================================== // // Get current light color // //========================================================================== static PalEntry gl_CalcLightColor(int light, PalEntry pe, int blendfactor) { int r,g,b; if (glset.lightmode == 8) { return pe; } else if (blendfactor == 0) { r = pe.r * light / 255; g = pe.g * light / 255; b = pe.b * light / 255; } else { // This is what Legacy does with colored light in 3D volumes. No, it doesn't really make sense... // It also doesn't translate well to software style lighting. int mixlight = light * (255 - blendfactor); r = (mixlight + pe.r * blendfactor) / 255; g = (mixlight + pe.g * blendfactor) / 255; b = (mixlight + pe.b * blendfactor) / 255; } return PalEntry(255, BYTE(r), BYTE(g), BYTE(b)); } //========================================================================== // // set current light color // //========================================================================== void gl_SetColor(int sectorlightlevel, int rellight, const FColormap &cm, float alpha, bool weapon) { if (gl_fixedcolormap != CM_DEFAULT) { gl_RenderState.SetColorAlpha(0xffffff, alpha, 0); gl_RenderState.SetSoftLightLevel(255); } else { int hwlightlevel = gl_CalcLightLevel(sectorlightlevel, rellight, weapon); PalEntry pe = gl_CalcLightColor(hwlightlevel, cm.LightColor, cm.blendfactor); gl_RenderState.SetColorAlpha(pe, alpha, cm.desaturation); gl_RenderState.SetSoftLightLevel(gl_ClampLight(sectorlightlevel + rellight)); } } //========================================================================== // // calculates the current fog density // // Rules for fog: // // 1. If bit 4 of gl_lightmode is set always use the level's fog density. // This is what Legacy's GL render does. // 2. black fog means no fog and always uses the distfogtable based on the level's fog density setting // 3. If outside fog is defined and the current fog color is the same as the outside fog // the engine always uses the outside fog density to make the fog uniform across the level. // If the outside fog's density is undefined it uses the level's fog density and if that is // not defined it uses a default of 70. // 4. If a global fog density is specified it is being used for all fog on the level // 5. If none of the above apply fog density is based on the light level as for the software renderer. // //========================================================================== float gl_GetFogDensity(int lightlevel, PalEntry fogcolor) { float density; if (glset.lightmode&4) { // uses approximations of Legacy's default settings. density = fogdensity? fogdensity : 18; } else if ((fogcolor.d & 0xffffff) == 0) { // case 1: black fog if (glset.lightmode != 8) { density=distfogtable[glset.lightmode!=0][gl_ClampLight(lightlevel)]; } else { density = 0; } } else if (outsidefogdensity != 0 && outsidefogcolor.a!=0xff && (fogcolor.d & 0xffffff) == (outsidefogcolor.d & 0xffffff)) { // case 2. outsidefogdensity has already been set as needed density=outsidefogdensity; } else if (fogdensity!=0) { // case 3: level has fog density set density=fogdensity; } else if (lightlevel < 248) { // case 4: use light level density=clamp(255-lightlevel,30,255); } else { density = 0.f; } return density; } //========================================================================== // // Check fog by current lighting info // //========================================================================== bool gl_CheckFog(FColormap *cm, int lightlevel) { // Check for fog boundaries. This needs a few more checks for the sectors bool frontfog; PalEntry fogcolor = cm->FadeColor; if ((fogcolor.d & 0xffffff) == 0) { frontfog = false; } else if (outsidefogdensity != 0 && outsidefogcolor.a!=0xff && (fogcolor.d & 0xffffff) == (outsidefogcolor.d & 0xffffff)) { frontfog = true; } else if (fogdensity!=0 || (glset.lightmode & 4)) { // case 3: level has fog density set frontfog = true; } else { // case 4: use light level frontfog = lightlevel < 248; } return frontfog; } //========================================================================== // // Check if the current linedef is a candidate for a fog boundary // // Requirements for a fog boundary: // - front sector has no fog // - back sector has fog // - at least one of both does not have a sky ceiling. // //========================================================================== bool gl_CheckFog(sector_t *frontsector, sector_t *backsector) { if (gl_fixedcolormap) return false; if (frontsector == backsector) return false; // there can't be a boundary if both sides are in the same sector. // Check for fog boundaries. This needs a few more checks for the sectors PalEntry fogcolor = frontsector->ColorMap->Fade; if ((fogcolor.d & 0xffffff) == 0) { return false; } else if (outsidefogdensity != 0 && outsidefogcolor.a!=0xff && (fogcolor.d & 0xffffff) == (outsidefogcolor.d & 0xffffff)) { } else if (fogdensity!=0 || (glset.lightmode & 4)) { // case 3: level has fog density set } else { // case 4: use light level if (frontsector->lightlevel >= 248) return false; } fogcolor = backsector->ColorMap->Fade; if ((fogcolor.d & 0xffffff) == 0) { } else if (outsidefogdensity != 0 && outsidefogcolor.a!=0xff && (fogcolor.d & 0xffffff) == (outsidefogcolor.d & 0xffffff)) { return false; } else if (fogdensity!=0 || (glset.lightmode & 4)) { // case 3: level has fog density set return false; } else { // case 4: use light level if (backsector->lightlevel < 248) return false; } // in all other cases this might create more problems than it solves. return ((frontsector->GetTexture(sector_t::ceiling)!=skyflatnum || backsector->GetTexture(sector_t::ceiling)!=skyflatnum)); } //========================================================================== // // Lighting stuff // //========================================================================== void gl_SetShaderLight(float level, float olight) { const float MAXDIST = 256.f; const float THRESHOLD = 96.f; const float FACTOR = 0.75f; if (level > 0) { float lightdist, lightfactor; if (olight < THRESHOLD) { lightdist = (MAXDIST/2) + (olight * MAXDIST / THRESHOLD / 2); olight = THRESHOLD; } else lightdist = MAXDIST; lightfactor = 1.f + ((olight/level) - 1.f) * FACTOR; if (lightfactor == 1.f) lightdist = 0.f; // save some code in the shader gl_RenderState.SetLightParms(lightfactor, lightdist); } else { gl_RenderState.SetLightParms(1.f, 0.f); } } //========================================================================== // // Sets the fog for the current polygon // //========================================================================== void gl_SetFog(int lightlevel, int rellight, const FColormap *cmap, bool isadditive) { PalEntry fogcolor; float fogdensity; if (level.flags&LEVEL_HASFADETABLE) { fogdensity=70; fogcolor=0x808080; } else if (cmap != NULL && gl_fixedcolormap == 0) { fogcolor = cmap->FadeColor; fogdensity = gl_GetFogDensity(lightlevel, fogcolor); fogcolor.a=0; } else { fogcolor = 0; fogdensity = 0; } // Make fog a little denser when inside a skybox if (GLPortal::inskybox) fogdensity+=fogdensity/2; // no fog in enhanced vision modes! if (fogdensity==0 || gl_fogmode == 0) { gl_RenderState.EnableFog(false); gl_RenderState.SetFog(0,0); } else { if (glset.lightmode == 2 && fogcolor == 0) { float light = gl_CalcLightLevel(lightlevel, rellight, false); gl_SetShaderLight(light, lightlevel); } else { gl_RenderState.SetLightParms(1.f, 0.f); } // For additive rendering using the regular fog color here would mean applying it twice // so always use black if (isadditive) { fogcolor=0; } gl_RenderState.EnableFog(true); gl_RenderState.SetFog(fogcolor, fogdensity); // Korshun: fullbright fog like in software renderer. if (glset.lightmode == 8 && glset.brightfog && fogdensity != 0 && fogcolor != 0) { gl_RenderState.SetSoftLightLevel(255); } } } //========================================================================== // // For testing sky fog sheets // //========================================================================== CCMD(skyfog) { if (argv.argc()>1) { skyfog=strtol(argv[1],NULL,0); } }