/*
** gldefs.cpp
** GLDEFS parser
**
**---------------------------------------------------------------------------
** Copyright 2003 Timothy Stump
** Copyright 2005-2018 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.
**
** 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 <ctype.h>
#include "i_system.h"
#include "doomtype.h"
#include "c_cvars.h"
#include "c_dispatch.h"
#include "m_random.h"
#include "sc_man.h"
#include "templates.h"
#include "w_wad.h"
#include "gi.h"
#include "r_state.h"
#include "stats.h"
#include "zstring.h"
#include "d_dehacked.h"
#include "v_text.h"
#include "g_levellocals.h"
#include "a_dynlight.h"
#include "textures/skyboxtexture.h"
#include "gl/shaders/gl_postprocessshader.h"

void AddLightDefaults(FLightDefaults *defaults);
void AddLightAssociation(const char *actor, const char *frame, const char *light);
void InitializeActorLights(TArray<FLightAssociation> &LightAssociations);

extern TArray<FString> usershaders;
extern TDeletingArray<FLightDefaults *> LightDefaults;


//-----------------------------------------------------------------------------
//
// ParseVavoomSkybox
//
//-----------------------------------------------------------------------------

static void ParseVavoomSkybox()
{
	int lump = Wads.CheckNumForName("SKYBOXES");

	if (lump < 0) return;

	FScanner sc(lump);
	while (sc.GetString())
	{
		int facecount=0;
		int maplump = -1;
		bool error = false;
		FSkyBox * sb = new FSkyBox;
		sb->Name = sc.String;
		sb->Name.ToUpper();
		sb->fliptop = true;
		sc.MustGetStringName("{");
		while (!sc.CheckString("}"))
		{
			if (facecount<6) 
			{
				sc.MustGetStringName("{");
				sc.MustGetStringName("map");
				sc.MustGetString();

				maplump = Wads.CheckNumForFullName(sc.String, true);

				FTexture *tex = TexMan.FindTexture(sc.String, ETextureType::Wall, FTextureManager::TEXMAN_TryAny);
				if (tex == NULL)
				{
					sc.ScriptMessage("Texture '%s' not found in Vavoom skybox '%s'\n", sc.String, sb->Name.GetChars());
					error = true;
				}
				sb->faces[facecount] = tex;
				sc.MustGetStringName("}");
			}
			facecount++;
		}
		if (facecount != 6)
		{
			sc.ScriptError("%s: Skybox definition requires 6 faces", sb->Name.GetChars());
		}
		sb->SetSize();
		if (!error) TexMan.AddTexture(sb);
	}
}



//==========================================================================
//
// light definition keywords
//
//==========================================================================


static const char *LightTags[]=
{
   "color",
   "size",
   "secondarySize",
   "offset",
   "chance",
   "interval",
   "scale",
   "frame",
   "light",
   "{",
   "}",
   "subtractive",
   "additive",
   "halo",
   "dontlightself",
   "attenuate",
   "dontlightactors",
   "spot",
   nullptr
};


enum {
   LIGHTTAG_COLOR,
   LIGHTTAG_SIZE,
   LIGHTTAG_SECSIZE,
   LIGHTTAG_OFFSET,
   LIGHTTAG_CHANCE,
   LIGHTTAG_INTERVAL,
   LIGHTTAG_SCALE,
   LIGHTTAG_FRAME,
   LIGHTTAG_LIGHT,
   LIGHTTAG_OPENBRACE,
   LIGHTTAG_CLOSEBRACE,
   LIGHTTAG_SUBTRACTIVE,
   LIGHTTAG_ADDITIVE,
   LIGHTTAG_HALO,
   LIGHTTAG_DONTLIGHTSELF,
   LIGHTTAG_ATTENUATE,
   LIGHTTAG_DONTLIGHTACTORS,
   LIGHTTAG_SPOT
};

//==========================================================================
//
// Top level keywords
//
//==========================================================================

// these are the core types available in the *DEFS lump
static const char *CoreKeywords[]=
{
   "pointlight",
   "pulselight",
   "flickerlight",
   "flickerlight2",
   "sectorlight",
   "object",
   "clearlights",
   "shader",
   "clearshaders",
   "skybox",
   "glow",
   "brightmap",
   "disable_fullbright",
   "hardwareshader",
   "detail",
   "#include",
   "material",
   nullptr
};


enum
{
   LIGHT_POINT,
   LIGHT_PULSE,
   LIGHT_FLICKER,
   LIGHT_FLICKER2,
   LIGHT_SECTOR,
   LIGHT_OBJECT,
   LIGHT_CLEAR,
   TAG_SHADER,
   TAG_CLEARSHADERS,
   TAG_SKYBOX,
   TAG_GLOW,
   TAG_BRIGHTMAP,
   TAG_DISABLE_FB,
   TAG_HARDWARESHADER,
   TAG_DETAIL,
   TAG_INCLUDE,
   TAG_MATERIAL
};

//==========================================================================
//
// GLDEFS parser
//
//==========================================================================

class GLDefsParser
{
	FScanner sc;
	int workingLump;
	int ScriptDepth = 0;
	TArray<FLightAssociation> &LightAssociations;

	//==========================================================================
	//
	// This is only here so any shader definition for ZDoomGL can be skipped
	// There is no functionality for this stuff!
	//
	//==========================================================================

	bool ParseShader()
	{
		int  ShaderDepth = 0;

		if (sc.GetString())
		{
			char *tmp;

			tmp = strstr(sc.String, "{");
			while (tmp)
			{
				ShaderDepth++;
				tmp++;
				tmp = strstr(tmp, "{");
			}

			tmp = strstr(sc.String, "}");
			while (tmp)
			{
				ShaderDepth--;
				tmp++;
				tmp = strstr(tmp, "}");
			}

			if (ShaderDepth == 0) return true;
		}
		return false;
	}

	//==========================================================================
	//
	// Parses a GLBoom+ detail texture definition
	//
	// Syntax is this:
	//	detail
	//	{
	//		(walls | flats) [default_detail_name [width [height [offset_x [offset_y]]]]]
	//		{
	//			texture_name [detail_name [width [height [offset_x [offset_y]]]]]
	//		}
	//	}
	// This merely parses the block and returns no error if valid. The feature
	// is not actually implemented, so nothing else happens.
	//
	// The semantics of this are too horrible to comprehend (default detail texture???)
	// so if this ever gets done, the parser will look different.
	//==========================================================================

	void ParseDetailTexture()
	{
		while (!sc.CheckToken('}'))
		{
			sc.MustGetString();
			if (sc.Compare("walls") || sc.Compare("flats"))
			{
				if (!sc.CheckToken('{'))
				{
					sc.MustGetString();  // Default detail texture
					if (sc.CheckFloat()) // Width
					if (sc.CheckFloat()) // Height
					if (sc.CheckFloat()) // OffsX
					if (sc.CheckFloat()) // OffsY
					{
						// Nothing
					}
				}
				else sc.UnGet();
				sc.MustGetToken('{');
				while (!sc.CheckToken('}'))
				{
					sc.MustGetString();  // Texture
					if (sc.GetString())	 // Detail texture
					{
						if (sc.CheckFloat()) // Width
						if (sc.CheckFloat()) // Height
						if (sc.CheckFloat()) // OffsX
						if (sc.CheckFloat()) // OffsY
						{
							// Nothing
						}
					}
					else sc.UnGet();
				}
			}
		}
	}

	
	//==========================================================================
	//
	//
	//
	//==========================================================================

	float ParseFloat(FScanner &sc)
	{
	   sc.MustGetFloat();
	   return float(sc.Float);
	}


	int ParseInt(FScanner &sc)
	{
	   sc.MustGetNumber();
	   return sc.Number;
	}


	char *ParseString(FScanner &sc)
	{
	   sc.GetString();
	   return sc.String;
	}


	void ParseTriple(FScanner &sc, float floatVal[3])
	{
	   for (int i = 0; i < 3; i++)
	   {
		  floatVal[i] = ParseFloat(sc);
	   }
	}


	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void AddLightAssociation(const char *actor, const char *frame, const char *light)
	{
		FLightAssociation *temp;
		unsigned int i;
		FLightAssociation assoc(actor, frame, light);

		for (i = 0; i < LightAssociations.Size(); i++)
		{
			temp = &LightAssociations[i];
			if (temp->ActorName() == assoc.ActorName())
			{
				if (strcmp(temp->FrameName(), assoc.FrameName()) == 0)
				{
					temp->ReplaceLightName(assoc.Light());
					return;
				}
			}
		}

		LightAssociations.Push(assoc);
	}

	//-----------------------------------------------------------------------------
	//
	// Note: The different light type parsers really could use some consolidation...
	//
	//-----------------------------------------------------------------------------

	void ParsePointLight()
	{
		int type;
		float floatTriple[3];
		int intVal;
		FLightDefaults *defaults;

		// get name
		sc.GetString();
		FName name = sc.String;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			defaults = new FLightDefaults(name, PointLight);
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_COLOR:
					ParseTriple(sc, floatTriple);
					defaults->SetArg(LIGHT_RED, clamp<int>((int)(floatTriple[0] * 255), 0, 255));
					defaults->SetArg(LIGHT_GREEN, clamp<int>((int)(floatTriple[1] * 255), 0, 255));
					defaults->SetArg(LIGHT_BLUE, clamp<int>((int)(floatTriple[2] * 255), 0, 255));
					break;
				case LIGHTTAG_OFFSET:
					ParseTriple(sc, floatTriple);
					defaults->SetOffset(floatTriple);
					break;
				case LIGHTTAG_SIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_INTENSITY, intVal);
					break;
				case LIGHTTAG_SUBTRACTIVE:
					defaults->SetSubtractive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ADDITIVE:
					defaults->SetAdditive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_HALO:
					defaults->SetHalo(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTSELF:
					defaults->SetDontLightSelf(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ATTENUATE:
					defaults->SetAttenuate(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTACTORS:
					defaults->SetDontLightActors(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_SPOT:
					{
						float innerAngle = ParseFloat(sc);
						float outerAngle = ParseFloat(sc);
						defaults->SetSpot(true);
						defaults->SetSpotInnerAngle(innerAngle);
						defaults->SetSpotOuterAngle(outerAngle);
					}
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
			AddLightDefaults(defaults);
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}

	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParsePulseLight()
	{
		int type;
		float floatVal, floatTriple[3];
		int intVal;
		FLightDefaults *defaults;

		// get name
		sc.GetString();
		FName name = sc.String;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			defaults = new FLightDefaults(name, PulseLight);
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_COLOR:
					ParseTriple(sc, floatTriple);
					defaults->SetArg(LIGHT_RED, clamp<int>((int)(floatTriple[0] * 255), 0, 255));
					defaults->SetArg(LIGHT_GREEN, clamp<int>((int)(floatTriple[1] * 255), 0, 255));
					defaults->SetArg(LIGHT_BLUE, clamp<int>((int)(floatTriple[2] * 255), 0, 255));
					break;
				case LIGHTTAG_OFFSET:
					ParseTriple(sc, floatTriple);
					defaults->SetOffset(floatTriple);
					break;
				case LIGHTTAG_SIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_INTENSITY, intVal);
					break;
				case LIGHTTAG_SECSIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_SECONDARY_INTENSITY, intVal);
					break;
				case LIGHTTAG_INTERVAL:
					floatVal = ParseFloat(sc);
					defaults->SetParameter(floatVal * TICRATE);
					break;
				case LIGHTTAG_SUBTRACTIVE:
					defaults->SetSubtractive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_HALO:
					defaults->SetHalo(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTSELF:
					defaults->SetDontLightSelf(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ATTENUATE:
					defaults->SetAttenuate(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTACTORS:
					defaults->SetDontLightActors(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_SPOT:
					{
						float innerAngle = ParseFloat(sc);
						float outerAngle = ParseFloat(sc);
						defaults->SetSpot(true);
						defaults->SetSpotInnerAngle(innerAngle);
						defaults->SetSpotOuterAngle(outerAngle);
					}
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
			defaults->OrderIntensities();

			AddLightDefaults(defaults);
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}


	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseFlickerLight()
	{
		int type;
		float floatVal, floatTriple[3];
		int intVal;
		FLightDefaults *defaults;

		// get name
		sc.GetString();
		FName name = sc.String;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			defaults = new FLightDefaults(name, FlickerLight);
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_COLOR:
					ParseTriple(sc, floatTriple);
					defaults->SetArg(LIGHT_RED, clamp<int>((int)(floatTriple[0] * 255), 0, 255));
					defaults->SetArg(LIGHT_GREEN, clamp<int>((int)(floatTriple[1] * 255), 0, 255));
					defaults->SetArg(LIGHT_BLUE, clamp<int>((int)(floatTriple[2] * 255), 0, 255));
					break;
				case LIGHTTAG_OFFSET:
					ParseTriple(sc, floatTriple);
					defaults->SetOffset(floatTriple);
					break;
				case LIGHTTAG_SIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_INTENSITY, intVal);
					break;
				case LIGHTTAG_SECSIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_SECONDARY_INTENSITY, intVal);
					break;
				case LIGHTTAG_CHANCE:
					floatVal = ParseFloat(sc);
					defaults->SetParameter(floatVal*360.);
					break;
				case LIGHTTAG_SUBTRACTIVE:
					defaults->SetSubtractive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_HALO:
					defaults->SetHalo(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTSELF:
					defaults->SetDontLightSelf(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ATTENUATE:
					defaults->SetAttenuate(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTACTORS:
					defaults->SetDontLightActors(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_SPOT:
					{
						float innerAngle = ParseFloat(sc);
						float outerAngle = ParseFloat(sc);
						defaults->SetSpot(true);
						defaults->SetSpotInnerAngle(innerAngle);
						defaults->SetSpotOuterAngle(outerAngle);
					}
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
			defaults->OrderIntensities();
			AddLightDefaults(defaults);
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}


	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseFlickerLight2()
	{
		int type;
		float floatVal, floatTriple[3];
		int intVal;
		FLightDefaults *defaults;

		// get name
		sc.GetString();
		FName name = sc.String;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			defaults = new FLightDefaults(name, RandomFlickerLight);
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_COLOR:
					ParseTriple(sc, floatTriple);
					defaults->SetArg(LIGHT_RED, clamp<int>((int)(floatTriple[0] * 255), 0, 255));
					defaults->SetArg(LIGHT_GREEN, clamp<int>((int)(floatTriple[1] * 255), 0, 255));
					defaults->SetArg(LIGHT_BLUE, clamp<int>((int)(floatTriple[2] * 255), 0, 255));
					break;
				case LIGHTTAG_OFFSET:
					ParseTriple(sc, floatTriple);
					defaults->SetOffset(floatTriple);
					break;
				case LIGHTTAG_SIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_INTENSITY, intVal);
					break;
				case LIGHTTAG_SECSIZE:
					intVal = clamp<int>(ParseInt(sc), 1, 1024);
					defaults->SetArg(LIGHT_SECONDARY_INTENSITY, intVal);
					break;
				case LIGHTTAG_INTERVAL:
					floatVal = ParseFloat(sc);
					defaults->SetParameter(floatVal * 360.);
					break;
				case LIGHTTAG_SUBTRACTIVE:
					defaults->SetSubtractive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_HALO:
					defaults->SetHalo(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTSELF:
					defaults->SetDontLightSelf(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ATTENUATE:
					defaults->SetAttenuate(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTACTORS:
					defaults->SetDontLightActors(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_SPOT:
					{
						float innerAngle = ParseFloat(sc);
						float outerAngle = ParseFloat(sc);
						defaults->SetSpot(true);
						defaults->SetSpotInnerAngle(innerAngle);
						defaults->SetSpotOuterAngle(outerAngle);
					}
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
			if (defaults->GetArg(LIGHT_SECONDARY_INTENSITY) < defaults->GetArg(LIGHT_INTENSITY))
			{
				int v = defaults->GetArg(LIGHT_SECONDARY_INTENSITY);
				defaults->SetArg(LIGHT_SECONDARY_INTENSITY, defaults->GetArg(LIGHT_INTENSITY));
				defaults->SetArg(LIGHT_INTENSITY, v);
			}
			AddLightDefaults(defaults);
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}


	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseSectorLight()
	{
		int type;
		float floatVal;
		float floatTriple[3];
		FLightDefaults *defaults;

		// get name
		sc.GetString();
		FName name = sc.String;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			defaults = new FLightDefaults(name, SectorLight);
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_COLOR:
					ParseTriple(sc, floatTriple);
					defaults->SetArg(LIGHT_RED, clamp<int>((int)(floatTriple[0] * 255), 0, 255));
					defaults->SetArg(LIGHT_GREEN, clamp<int>((int)(floatTriple[1] * 255), 0, 255));
					defaults->SetArg(LIGHT_BLUE, clamp<int>((int)(floatTriple[2] * 255), 0, 255));
					break;
				case LIGHTTAG_OFFSET:
					ParseTriple(sc, floatTriple);
					defaults->SetOffset(floatTriple);
					break;
				case LIGHTTAG_SCALE:
					floatVal = ParseFloat(sc);
					defaults->SetArg(LIGHT_SCALE, clamp((int)(floatVal * 255), 1, 1024));
					break;
				case LIGHTTAG_SUBTRACTIVE:
					defaults->SetSubtractive(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_HALO:
					defaults->SetHalo(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTSELF:
					defaults->SetDontLightSelf(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_ATTENUATE:
					defaults->SetAttenuate(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_DONTLIGHTACTORS:
					defaults->SetDontLightActors(ParseInt(sc) != 0);
					break;
				case LIGHTTAG_SPOT:
					{
						float innerAngle = ParseFloat(sc);
						float outerAngle = ParseFloat(sc);
						defaults->SetSpot(true);
						defaults->SetSpotInnerAngle(innerAngle);
						defaults->SetSpotOuterAngle(outerAngle);
					}
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
			AddLightDefaults(defaults);
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}

	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseFrame(const FString &name)
	{
		int type, startDepth;
		FString frameName;

		// get name
		sc.GetString();
		if (strlen(sc.String) > 8)
		{
			sc.ScriptError("Name longer than 8 characters: %s\n", sc.String);
		}
		frameName = sc.String;

		startDepth = ScriptDepth;

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			ScriptDepth++;
			while (ScriptDepth > startDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_LIGHT:
					ParseString(sc);
					AddLightAssociation(name, frameName, sc.String);
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}

	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseObject()
	{
		int type;
		FString name;

		// get name
		sc.GetString();
		name = sc.String;
		if (!PClass::FindActor(name))
			sc.ScriptMessage("Warning: dynamic lights attached to non-existent actor %s\n", name.GetChars());

		// check for opening brace
		sc.GetString();
		if (sc.Compare("{"))
		{
			ScriptDepth++;
			while (ScriptDepth)
			{
				sc.GetString();
				type = sc.MatchString(LightTags);
				switch (type)
				{
				case LIGHTTAG_OPENBRACE:
					ScriptDepth++;
					break;
				case LIGHTTAG_CLOSEBRACE:
					ScriptDepth--;
					break;
				case LIGHTTAG_FRAME:
					ParseFrame(name);
					break;
				default:
					sc.ScriptError("Unknown tag: %s\n", sc.String);
				}
			}
		}
		else
		{
			sc.ScriptError("Expected '{'.\n");
		}
	}
	

	//-----------------------------------------------------------------------------
	//
	//
	//
	//-----------------------------------------------------------------------------

	void ParseGldefSkybox()
	{
		int facecount=0;

		sc.MustGetString();

		FSkyBox * sb = new FSkyBox;
		sb->Name = sc.String;
		sb->Name.ToUpper();
		if (sc.CheckString("fliptop"))
		{
			sb->fliptop = true;
		}
		sc.MustGetStringName("{");
		while (!sc.CheckString("}"))
		{
			sc.MustGetString();
			if (facecount<6) 
			{
				sb->faces[facecount] = TexMan[TexMan.GetTexture(sc.String, ETextureType::Wall, FTextureManager::TEXMAN_TryAny|FTextureManager::TEXMAN_Overridable)];
			}
			facecount++;
		}
		if (facecount != 3 && facecount != 6)
		{
			sc.ScriptError("%s: Skybox definition requires either 3 or 6 faces", sb->Name.GetChars());
		}
		sb->SetSize();
		TexMan.AddTexture(sb);
	}

	//===========================================================================
	// 
	//	Reads glow definitions from GLDEFS
	//
	//===========================================================================

	void ParseGlow()
	{
		sc.MustGetStringName("{");
		while (!sc.CheckString("}"))
		{
			sc.MustGetString();
			if (sc.Compare("FLATS"))
			{
				sc.MustGetStringName("{");
				while (!sc.CheckString("}"))
				{
					sc.MustGetString();
					FTextureID flump=TexMan.CheckForTexture(sc.String, ETextureType::Flat,FTextureManager::TEXMAN_TryAny);
					FTexture *tex = TexMan[flump];
					if (tex) tex->bAutoGlowing = tex->bGlowing = tex->bFullbright = true;
				}
			}
			else if (sc.Compare("WALLS"))
			{
				sc.MustGetStringName("{");
				while (!sc.CheckString("}"))
				{
					sc.MustGetString();
					FTextureID flump=TexMan.CheckForTexture(sc.String, ETextureType::Wall,FTextureManager::TEXMAN_TryAny);
					FTexture *tex = TexMan[flump];
					if (tex) tex->bAutoGlowing = tex->bGlowing = tex->bFullbright = true;
				}
			}
			else if (sc.Compare("TEXTURE"))
			{
				sc.SetCMode(true);
				sc.MustGetString();
				FTextureID flump=TexMan.CheckForTexture(sc.String, ETextureType::Flat,FTextureManager::TEXMAN_TryAny);
				FTexture *tex = TexMan[flump];
				sc.MustGetStringName(",");
				sc.MustGetString();
				PalEntry color = V_GetColor(NULL, sc.String);
				//sc.MustGetStringName(",");
				//sc.MustGetNumber();
				if (sc.CheckString(","))
				{
					if (sc.CheckNumber())
					{
						if (tex) tex->GlowHeight = sc.Number;
						if (!sc.CheckString(",")) goto skip_fb;
					}

					sc.MustGetStringName("fullbright");
					if (tex) tex->bFullbright = true;
				}
			skip_fb:
				sc.SetCMode(false);

				if (tex && color != 0)
				{
					tex->bAutoGlowing = false;
					tex->bGlowing = true;
					tex->GlowColor = color;
				}
			}
		}
	}


	//==========================================================================
	//
	// Parses a brightmap definition
	//
	//==========================================================================

	void ParseBrightmap()
	{
		ETextureType type = ETextureType::Any;
		bool disable_fullbright=false;
		bool thiswad = false;
		bool iwad = false;
		FTexture *bmtex = NULL;

		sc.MustGetString();
		if (sc.Compare("texture")) type = ETextureType::Wall;
		else if (sc.Compare("flat")) type = ETextureType::Flat;
		else if (sc.Compare("sprite")) type = ETextureType::Sprite;
		else sc.UnGet();

		sc.MustGetString();
		FTextureID no = TexMan.CheckForTexture(sc.String, type, FTextureManager::TEXMAN_TryAny | FTextureManager::TEXMAN_Overridable);
		FTexture *tex = TexMan[no];

		sc.MustGetToken('{');
		while (!sc.CheckToken('}'))
		{
			sc.MustGetString();
			if (sc.Compare("disablefullbright"))
			{
				// This can also be used without a brightness map to disable
				// fullbright in rotations that only use brightness maps on
				// other angles.
				disable_fullbright = true;
			}
			else if (sc.Compare("thiswad"))
			{
				// only affects textures defined in the WAD containing the definition file.
				thiswad = true;
			}
			else if (sc.Compare ("iwad"))
			{
				// only affects textures defined in the IWAD.
				iwad = true;
			}
			else if (sc.Compare ("map"))
			{
				sc.MustGetString();

				if (bmtex != NULL)
				{
					Printf("Multiple brightmap definitions in texture %s\n", tex? tex->Name.GetChars() : "(null)");
				}

				bmtex = TexMan.FindTexture(sc.String, ETextureType::Any, FTextureManager::TEXMAN_TryAny);

				if (bmtex == NULL) 
					Printf("Brightmap '%s' not found in texture '%s'\n", sc.String, tex? tex->Name.GetChars() : "(null)");
			}
		}
		if (!tex)
		{
			return;
		}
		if (thiswad || iwad)
		{
			bool useme = false;
			int lumpnum = tex->GetSourceLump();

			if (lumpnum != -1)
			{
				if (iwad && Wads.GetLumpFile(lumpnum) <= Wads.GetIwadNum()) useme = true;
				if (thiswad && Wads.GetLumpFile(lumpnum) == workingLump) useme = true;
			}
			if (!useme) return;
		}

		if (bmtex != NULL)
		{
			/* I do not think this is needed any longer
			if (tex->bWarped != 0)
			{
				Printf("Cannot combine warping with brightmap on texture '%s'\n", tex->Name.GetChars());
				return;
			}
			*/

			bmtex->bMasked = false;
			tex->Brightmap = bmtex;
		}	
		tex->bDisableFullbright = disable_fullbright;
	}


	//==========================================================================
	//
	// Parses a material definition
	//
	//==========================================================================

	void ParseMaterial()
	{
		ETextureType type = ETextureType::Any;
		bool disable_fullbright = false;
		bool disable_fullbright_specified = false;
		bool thiswad = false;
		bool iwad = false;

		FTexture *textures[6];
		const char *keywords[7] = { "brightmap", "normal", "specular", "metallic", "roughness", "ao", nullptr };
		const char *notFound[6] = { "Brightmap", "Normalmap", "Specular texture", "Metallic texture", "Roughness texture", "Ambient occlusion texture" };
		memset(textures, 0, sizeof(textures));

		sc.MustGetString();
		if (sc.Compare("texture")) type = ETextureType::Wall;
		else if (sc.Compare("flat")) type = ETextureType::Flat;
		else if (sc.Compare("sprite")) type = ETextureType::Sprite;
		else sc.UnGet();

		sc.MustGetString();
		FTextureID no = TexMan.CheckForTexture(sc.String, type, FTextureManager::TEXMAN_TryAny | FTextureManager::TEXMAN_Overridable);
		FTexture *tex = TexMan[no];

		sc.MustGetToken('{');
		while (!sc.CheckToken('}'))
		{
			sc.MustGetString();
			if (sc.Compare("disablefullbright"))
			{
				// This can also be used without a brightness map to disable
				// fullbright in rotations that only use brightness maps on
				// other angles.
				disable_fullbright = true;
				disable_fullbright_specified = true;
			}
			else if (sc.Compare("thiswad"))
			{
				// only affects textures defined in the WAD containing the definition file.
				thiswad = true;
			}
			else if (sc.Compare ("iwad"))
			{
				// only affects textures defined in the IWAD.
				iwad = true;
			}
			else if (sc.Compare("glossiness"))
			{
				sc.MustGetFloat();
				if (tex)
					tex->Glossiness = (float)sc.Float;
			}
			else if (sc.Compare("specularlevel"))
			{
				sc.MustGetFloat();
				if (tex)
					tex->SpecularLevel = (float)sc.Float;
			}
			else
			{
				for (int i = 0; keywords[i] != nullptr; i++)
				{
					if (sc.Compare (keywords[i]))
					{
						sc.MustGetString();
						if (textures[i])
							Printf("Multiple %s definitions in texture %s\n", keywords[i], tex? tex->Name.GetChars() : "(null)");
						textures[i] = TexMan.FindTexture(sc.String, ETextureType::Any, FTextureManager::TEXMAN_TryAny);
						if (!textures[i])
							Printf("%s '%s' not found in texture '%s'\n", notFound[i], sc.String, tex? tex->Name.GetChars() : "(null)");
						break;
					}
				}
			}
		}
		if (!tex)
		{
			return;
		}
		if (thiswad || iwad)
		{
			bool useme = false;
			int lumpnum = tex->GetSourceLump();

			if (lumpnum != -1)
			{
				if (iwad && Wads.GetLumpFile(lumpnum) <= Wads.GetIwadNum()) useme = true;
				if (thiswad && Wads.GetLumpFile(lumpnum) == workingLump) useme = true;
			}
			if (!useme) return;
		}

		FTexture **bindings[6] =
		{
			&tex->Brightmap,
			&tex->Normal,
			&tex->Specular,
			&tex->Metallic,
			&tex->Roughness,
			&tex->AmbientOcclusion
		};
		for (int i = 0; keywords[i] != nullptr; i++)
		{
			if (textures[i])
			{
				textures[i]->bMasked = false;
				*bindings[i] = textures[i];
			}
		}

		if (disable_fullbright_specified)
			tex->bDisableFullbright = disable_fullbright;
	}


	//==========================================================================
	//
	// Parses a shader definition
	//
	//==========================================================================

	void ParseHardwareShader()
	{
		sc.MustGetString();
		if (sc.Compare("postprocess"))
		{
			sc.MustGetString();

			PostProcessShader shaderdesc;
			shaderdesc.Target = sc.String;
			shaderdesc.Target.ToLower();

			bool validTarget = false;
			if (sc.Compare("beforebloom")) validTarget = true;
			if (sc.Compare("scene")) validTarget = true;
			if (sc.Compare("screen")) validTarget = true;		
			if (!validTarget)
				sc.ScriptError("Invalid target '%s' for postprocess shader",sc.String);

			sc.MustGetToken('{');
			while (!sc.CheckToken('}'))
			{
				sc.MustGetString();
				if (sc.Compare("shader"))
				{
					sc.MustGetString();
					shaderdesc.ShaderLumpName = sc.String;

					sc.MustGetNumber();
					shaderdesc.ShaderVersion = sc.Number;
					if (sc.Number > 450 || sc.Number < 330)
						sc.ScriptError("Shader version must be in range 330 to 450!");
				}
				else if (sc.Compare("name"))
				{
					sc.MustGetString();
					shaderdesc.Name = sc.String;
				}
				else if (sc.Compare("uniform"))
				{
					sc.MustGetString();
					FString uniformType = sc.String;
					uniformType.ToLower();

					sc.MustGetString();
					FString uniformName = sc.String;

					PostProcessUniformType parsedType = PostProcessUniformType::Undefined;

					if (uniformType.Compare("int") == 0)
						parsedType = PostProcessUniformType::Int;
					else if (uniformType.Compare("float") == 0)
						parsedType = PostProcessUniformType::Float;
					else if (uniformType.Compare("vec2") == 0)
						parsedType = PostProcessUniformType::Vec2;
					else if (uniformType.Compare("vec3") == 0)
						parsedType = PostProcessUniformType::Vec3;
					else
						sc.ScriptError("Unrecognized uniform type '%s'", sc.String);

					if (parsedType != PostProcessUniformType::Undefined)
						shaderdesc.Uniforms[uniformName].Type = parsedType;
				}
				else if (sc.Compare("texture"))
				{
					sc.MustGetString();
					FString textureName = sc.String;

					sc.MustGetString();
					FString textureSource = sc.String;

					shaderdesc.Textures[textureName] = textureSource;
				}
				else if (sc.Compare("enabled"))
				{
					shaderdesc.Enabled = true;
				}
				else
				{
					sc.ScriptError("Unknown keyword '%s'", sc.String);
				}
			}

			PostProcessShaders.Push(shaderdesc);
		}
		else
		{
			ETextureType type = ETextureType::Any;

			if (sc.Compare("texture")) type = ETextureType::Wall;
			else if (sc.Compare("flat")) type = ETextureType::Flat;
			else if (sc.Compare("sprite")) type = ETextureType::Sprite;
			else sc.UnGet();

			bool disable_fullbright = false;
			bool thiswad = false;
			bool iwad = false;
			int maplump = -1;
			FString maplumpname;
			float speed = 1.f;

			sc.MustGetString();
			FTextureID no = TexMan.CheckForTexture(sc.String, type);
			FTexture *tex = TexMan[no];

			sc.MustGetToken('{');
			while (!sc.CheckToken('}'))
			{
				sc.MustGetString();
				if (sc.Compare("shader"))
				{
					sc.MustGetString();
					maplumpname = sc.String;
				}
				else if (sc.Compare("speed"))
				{
					sc.MustGetFloat();
					speed = float(sc.Float);
				}
			}
			if (!tex)
			{
				return;
			}

			if (maplumpname.IsNotEmpty())
			{
				if (tex->bWarped != 0)
				{
					Printf("Cannot combine warping with hardware shader on texture '%s'\n", tex->Name.GetChars());
					return;
				}
				tex->shaderspeed = speed;
				for (unsigned i = 0; i < usershaders.Size(); i++)
				{
					if (!usershaders[i].CompareNoCase(maplumpname))
					{
						tex->shaderindex = i + FIRST_USER_SHADER;
						return;
					}
				}
				tex->shaderindex = usershaders.Push(maplumpname) + FIRST_USER_SHADER;
			}
		}
	}

	

public:
	//==========================================================================
	//
	//
	//
	//==========================================================================
	void DoParseDefs()
	{
		int recursion=0;
		int lump, type;

		// Get actor class name.
		while (true)
		{
			sc.SavePos();
			if (!sc.GetToken ())
			{
				return;
			}
			type = sc.MatchString(CoreKeywords);
			switch (type)
			{
			case TAG_INCLUDE:
				{
					sc.MustGetString();
					// This is not using sc.Open because it can print a more useful error message when done here
					lump = Wads.CheckNumForFullName(sc.String, true);
					if (lump==-1)
						sc.ScriptError("Lump '%s' not found", sc.String);

					GLDefsParser newscanner(lump, LightAssociations);
					newscanner.DoParseDefs();
					break;
				}
			case LIGHT_POINT:
				ParsePointLight();
				break;
			case LIGHT_PULSE:
				ParsePulseLight();
				break;
			case LIGHT_FLICKER:
				ParseFlickerLight();
				break;
			case LIGHT_FLICKER2:
				ParseFlickerLight2();
				break;
			case LIGHT_SECTOR:
				ParseSectorLight();
				break;
			case LIGHT_OBJECT:
				ParseObject();
				break;
			case LIGHT_CLEAR:
				// This has been intentionally removed
				break;
			case TAG_SHADER:
				ParseShader();
				break;
			case TAG_CLEARSHADERS:
				break;
			case TAG_SKYBOX:
				ParseGldefSkybox();
				break;
			case TAG_GLOW:
				ParseGlow();
				break;
			case TAG_BRIGHTMAP:
				ParseBrightmap();
				break;
			case TAG_MATERIAL:
				ParseMaterial();
				break;
			case TAG_HARDWARESHADER:
				ParseHardwareShader();
				break;
			case TAG_DETAIL:
				ParseDetailTexture();
				break;
			case TAG_DISABLE_FB:
				{
					/* not implemented.
					sc.MustGetString();
					const PClass *cls = PClass::FindClass(sc.String);
					if (cls) GetDefaultByType(cls)->renderflags |= RF_NEVERFULLBRIGHT;
					*/
				}
				break;
			default:
				sc.ScriptError("Error parsing defs.  Unknown tag: %s.\n", sc.String);
				break;
			}
		}
	}
	
	GLDefsParser(int lumpnum, TArray<FLightAssociation> &la)
	 : sc(lumpnum), workingLump(lumpnum), LightAssociations(la)
	{
	}
};

//==========================================================================
//
//
//
//==========================================================================

void LoadGLDefs(const char *defsLump)
{
	TArray<FLightAssociation> LightAssociations;
	int workingLump, lastLump;
	static const char *gldefsnames[] = { "GLDEFS", defsLump, nullptr };

	lastLump = 0;
	while ((workingLump = Wads.FindLumpMulti(gldefsnames, &lastLump)) != -1)
	{
		GLDefsParser sc(workingLump, LightAssociations);
		sc.DoParseDefs();
	}
	InitializeActorLights(LightAssociations);
}


//==========================================================================
//
//
//
//==========================================================================

void ParseGLDefs()
{
	const char *defsLump = NULL;

	LightDefaults.Clear();
	//gl_DestroyUserShaders(); function says 'todo'
	switch (gameinfo.gametype)
	{
	case GAME_Heretic:
		defsLump = "HTICDEFS";
		break;
	case GAME_Hexen:
		defsLump = "HEXNDEFS";
		break;
	case GAME_Strife:
		defsLump = "STRFDEFS";
		break;
	case GAME_Doom:
		defsLump = "DOOMDEFS";
		break;
	case GAME_Chex:
		defsLump = "CHEXDEFS";
		break;
	default: // silence GCC
		break;
	}
	ParseVavoomSkybox();
	LoadGLDefs(defsLump);
}