/*
** menudef.cpp
** MENUDEF parser amd menu generation code
**
**---------------------------------------------------------------------------
** Copyright 2010 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 <float.h>

#include "menu.h"
#include "filesystem.h"
#include "c_bind.h"
#include "i_music.h"
#include "i_sound.h"
#include "cmdlib.h"
#include "vm.h"
#include "types.h"
#include "m_argv.h"
#include "i_soundfont.h"
#include "i_system.h"
#include "v_video.h"
#include "gstrings.h"
#include <zmusic.h>
#include "texturemanager.h"
#include "printf.h"
#include "i_interface.h"



bool CheckSkipGameOptionBlock(FScanner& sc);

MenuDescriptorList MenuDescriptors;
static DListMenuDescriptor *DefaultListMenuSettings;	// contains common settings for all list menus
static DOptionMenuDescriptor *DefaultOptionMenuSettings;	// contains common settings for all Option menus
FOptionMenuSettings OptionSettings;
FOptionMap OptionValues;
bool mustPrintErrors;
PClass *DefaultListMenuClass;
PClass *DefaultOptionMenuClass;

void I_BuildALDeviceList(FOptionValues *opt);
void I_BuildALResamplersList(FOptionValues *opt);



DEFINE_GLOBAL_NAMED(OptionSettings, OptionMenuSettings)

DEFINE_ACTION_FUNCTION(FOptionValues, GetCount)
{
	PARAM_PROLOGUE;
	PARAM_NAME(grp);
	int cnt = 0;
	FOptionValues **pGrp = OptionValues.CheckKey(grp);
	if (pGrp != nullptr)
	{
		cnt = (*pGrp)->mValues.Size();
	}
	ACTION_RETURN_INT(cnt);
}

DEFINE_ACTION_FUNCTION(FOptionValues, GetValue)
{
	PARAM_PROLOGUE;
	PARAM_NAME(grp);
	PARAM_UINT(index);
	double val = 0;
	FOptionValues **pGrp = OptionValues.CheckKey(grp);
	if (pGrp != nullptr)
	{
		if (index < (*pGrp)->mValues.Size())
		{
			val = (*pGrp)->mValues[index].Value;
		}
	}
	ACTION_RETURN_FLOAT(val);
}

DEFINE_ACTION_FUNCTION(FOptionValues, GetTextValue)
{
	PARAM_PROLOGUE;
	PARAM_NAME(grp);
	PARAM_UINT(index);
	FString val;
	FOptionValues **pGrp = OptionValues.CheckKey(grp);
	if (pGrp != nullptr)
	{
		if (index < (*pGrp)->mValues.Size())
		{
			val = (*pGrp)->mValues[index].TextValue;
		}
	}
	ACTION_RETURN_STRING(val);
}

DEFINE_ACTION_FUNCTION(FOptionValues, GetText)
{
	PARAM_PROLOGUE;
	PARAM_NAME(grp);
	PARAM_UINT(index);
	FString val;
	FOptionValues **pGrp = OptionValues.CheckKey(grp);
	if (pGrp != nullptr)
	{
		if (index < (*pGrp)->mValues.Size())
		{
			val = (*pGrp)->mValues[index].Text;
		}
	}
	ACTION_RETURN_STRING(val);
}


void DeinitMenus()
{
	M_ClearMenus();
	{
		FOptionMap::Iterator it(OptionValues);

		FOptionMap::Pair *pair;

		while (it.NextPair(pair))
		{
			delete pair->Value;
			pair->Value = nullptr;
		}
	}
	if (menuDelegate)
	{
		menuDelegate->Destroy();
		menuDelegate = nullptr;
	}
	MenuDescriptors.Clear();
	OptionValues.Clear();
}

FTextureID GetMenuTexture(const char* const name)
{
	const FTextureID texture = TexMan.CheckForTexture(name, ETextureType::MiscPatch);

	if (!texture.Exists() && mustPrintErrors)
	{
		Printf("Missing menu texture: \"%s\"\n", name);
	}

	return texture;
}

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

static void SkipSubBlock(FScanner &sc)
{
	sc.MustGetStringName("{");
	sc.SkipToEndOfBlock();
}

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

static bool CheckSkipGameBlock(FScanner &sc, bool yes = true)
{
	bool filter = false;
	sc.MustGetStringName("(");
	do
	{
		sc.MustGetString();
		if (sysCallbacks.CheckGame) filter |= sysCallbacks.CheckGame(sc.String);
	}
	while (sc.CheckString(","));
	sc.MustGetStringName(")");
	if (filter != yes)
	{
		SkipSubBlock(sc);
		return !sc.CheckString("else");
	}
	return false;
}

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

static bool CheckSkipOptionBlock(FScanner &sc)
{
	bool filter = false;
	sc.MustGetStringName("(");
	do
	{
		sc.MustGetString();
		if (sysCallbacks.CheckMenudefOption && sysCallbacks.CheckMenudefOption(sc.String)) filter = true;
		else if (sc.Compare("Windows"))
		{
			#ifdef _WIN32
				filter = true;
			#endif
		}
		else if (sc.Compare("unix"))
		{
			#ifdef __unix__
				filter = true;
			#endif
		}
		else if (sc.Compare("Mac"))
		{
			#ifdef __APPLE__
				filter = true;
			#endif
		}
		else if (sc.Compare("OpenAL"))
		{
			filter |= IsOpenALPresent();
		}
		else if (sc.Compare("MMX"))
		{
			#ifdef HAVE_MMX
				filter = true;
			#endif
		}
		else if (sc.Compare("SWRender"))
		{
#ifndef NO_SWRENDERER
			filter = true;
#endif
		}
	}
	while (sc.CheckString(","));
	sc.MustGetStringName(")");
	if (!filter)
	{
		SkipSubBlock(sc);
		return !sc.CheckString("else");
	}
	return false;
}

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

static void DoParseListMenuBody(FScanner &sc, DListMenuDescriptor *desc, bool &sizecompatible, int insertIndex)
{
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		sc.MustGetString();
		if (sc.Compare("else"))
		{
			SkipSubBlock(sc);
		}
		else if (sc.Compare("ifgame"))
		{
			if (!CheckSkipGameBlock(sc))
			{
				// recursively parse sub-block
				DoParseListMenuBody(sc, desc, sizecompatible, insertIndex);
			}
		}
		else if (sc.Compare("ifnotgame"))
		{
			if (!CheckSkipGameBlock(sc, false))
			{
				// recursively parse sub-block
				DoParseListMenuBody(sc, desc, sizecompatible, insertIndex);
			}
		}
		else if (sc.Compare("ifoption"))
		{
			if (!CheckSkipOptionBlock(sc))
			{
				// recursively parse sub-block
				DoParseListMenuBody(sc, desc, sizecompatible, insertIndex);
			}
		}
		else if (sc.Compare("Class"))
		{
			sc.MustGetString();
			PClass *cls = PClass::FindClass(sc.String);
			if (cls == nullptr || !cls->IsDescendantOf("ListMenu"))
			{
				sc.ScriptError("Unknown menu class '%s'", sc.String);
			}
			desc->mClass = cls;
			sizecompatible = false;
		}
		else if (sc.Compare("Selector"))
		{
			sc.MustGetString();
			desc->mSelector = GetMenuTexture(sc.String);
			sc.MustGetStringName(",");
			sc.MustGetFloat();
			desc->mSelectOfsX = sc.Float;
			sc.MustGetStringName(",");
			sc.MustGetFloat();
			desc->mSelectOfsY = sc.Float;
		}
		else if (sc.Compare("Linespacing"))
		{
			sc.MustGetNumber();
			desc->mLinespacing = sc.Number;
		}
		else if (sc.Compare("Position"))
		{
			sc.MustGetFloat();
			desc->mXpos = sc.Float;
			sc.MustGetStringName(",");
			sc.MustGetFloat();
			desc->mYpos = sc.Float;
		}
		else if (sc.Compare("Centermenu"))
		{
			desc->mCenter = true;
		}
		else if (sc.Compare("Selecteditem"))
		{
			desc->mSelectedItem = desc->mItems.Size() - 1;
		}
		else if (sc.Compare("animatedtransition"))
		{
			desc->mAnimatedTransition = true;
		}
		else if (sc.Compare("animated"))
		{
			desc->mAnimated = true;
		}
		else if (sc.Compare("DontDim"))
		{
			desc->mDontDim = true;
		}
		else if (sc.Compare("DontBlur"))
		{
			desc->mDontBlur = true;
		}
		else if (sc.Compare("MouseWindow"))
		{
			sc.MustGetNumber();
			desc->mWLeft = sc.Number;
			sc.MustGetStringName(",");
			sc.MustGetNumber();
			desc->mWRight = sc.Number;
		}
		else if (sc.Compare("Font"))
		{
			sc.MustGetString();
			FFont *newfont = V_GetFont(sc.String);
			if (newfont != nullptr) desc->mFont = newfont;
			if (sc.CheckString(","))
			{
				sc.MustGetString();
				desc->mFontColor2 = desc->mFontColor = V_FindFontColor((FName)sc.String);
				if (sc.CheckString(","))
				{
					sc.MustGetString();
					desc->mFontColor2 = V_FindFontColor((FName)sc.String);
				}
			}
			else
			{
				desc->mFontColor = OptionSettings.mFontColor;
				desc->mFontColor2 = OptionSettings.mFontColorValue;
			}
		}
		else if (sc.Compare("NetgameMessage"))
		{
			sc.MustGetString();
			desc->mNetgameMessage = sc.String;
		}
		else if (sc.Compare("size"))
		{
			desc->mCustomSizeSet = true;
			if (sc.CheckNumber())
			{
				desc->mVirtWidth = sc.Number;
				sc.MustGetStringName(",");
				sc.MustGetNumber();
				desc->mVirtHeight = sc.Number;
			}
			else
			{
				sc.MustGetString();
				if (sc.Compare("clean"))
				{
					desc->mVirtWidth = -1;
				}
				else if (sc.Compare("optclean"))
				{
					desc->mVirtWidth = -2;
				}
				else
				{
					sc.ScriptError("Invalid value '%s' for 'size'", sc.String);
				}
			}
		}
		else if (sc.Compare("ForceList"))
		{
			desc->mForceList = true;
		}
		else
		{
			// all item classes from which we know that they support sized scaling.
			// If anything else comes through here the option to swich scaling mode is disabled for this menu.
			static const char*  const compatibles[] = { "StaticPatch", "StaticText", "StaticTextCentered", "TextItem", "PatchItem", "PlayerDisplay", nullptr };
			if (sc.MatchString(compatibles) < 0) sizecompatible = false;

			bool success = false;
			FStringf buildname("ListMenuItem%s", sc.String);
			PClass *cls = PClass::FindClass(buildname);
			if (cls != nullptr && cls->IsDescendantOf("ListMenuItem"))
			{
				bool inserting = insertIndex >= 0;
				bool isSelectable = cls->IsDescendantOf("ListMenuItemSelectable");
				double oldYpos = desc->mYpos;

				// [Player701] If this is a selectable item and we're inserting in the middle,
				// set the Y position of the descriptor to the Y of the item we're inserting before.
				if (isSelectable && inserting)
				{
					desc->mYpos = desc->mItems[insertIndex]->mYpos;
				}

				auto func = dyn_cast<PFunction>(cls->FindSymbol("Init", true));
				if (func != nullptr && !(func->Variants[0].Flags & (VARF_Protected | VARF_Private)))	// skip internal classes which have a protected init method.
				{
					auto &args = func->Variants[0].Proto->ArgumentTypes;
					TArray<VMValue> params;
					int start = 1;

					params.Push(0);
					if (args.Size() > 1 && args[1] == NewPointer(PClass::FindClass("ListMenuDescriptor")))
					{
						params.Push(desc);
						start = 2;
					}
					auto TypeCVar = NewPointer(NewStruct("CVar", nullptr, true));

					// Note that this array may not be reallocated so its initial size must be the maximum possible elements.
					TArray<FString> strings(args.Size());
					for (unsigned i = start; i < args.Size(); i++)
					{
						sc.MustGetString();
						if (args[i] == TypeString)
						{
							strings.Push(sc.String);
							params.Push(&strings.Last());
						}
						else if (args[i] == TypeName)
						{
							params.Push(FName(sc.String).GetIndex());
						}
						else if (args[i] == TypeColor)
						{
							params.Push(V_GetColor(sc));
						}
						else if (args[i] == TypeFont)
						{
							auto f = V_GetFont(sc.String);
							if (f == nullptr)
							{
								sc.ScriptError("Unknown font %s", sc.String);
							}
							params.Push(f);
						}
						else if (args[i] == TypeTextureID)
						{
							auto f = TexMan.CheckForTexture(sc.String, ETextureType::MiscPatch);
							if (!f.Exists())
							{
								sc.ScriptMessage("Unknown texture %s", sc.String);
							}
							params.Push(f.GetIndex());
						}
						else if (args[i]->isIntCompatible())
						{
							char *endp;
							int v = (int)strtoll(sc.String, &endp, 0);
							if (*endp != 0)
							{
								// special check for font color ranges.
								v = V_FindFontColor(sc.String);
								if (v == CR_UNTRANSLATED && !sc.Compare("untranslated"))
								{
									// todo: check other data types that may get used.
									sc.ScriptError("Integer expected, got %s", sc.String);
								}
							}
							if (args[i] == TypeBool) v = !!v;
							params.Push(v);
						}
						else if (args[i]->isFloat())
						{
							char *endp;
							double v = strtod(sc.String, &endp);
							if (*endp != 0)
							{
								sc.ScriptError("Float expected, got %s", sc.String);
							}
							params.Push(v);
						}
						else if (args[i] == TypeCVar)
						{
							auto cv = FindCVar(sc.String, nullptr);
							if (cv == nullptr && *sc.String)
							{
								sc.ScriptError("Unknown CVar %s", sc.String);
							}
							params.Push(cv);
						}
						else
						{
							sc.ScriptError("Invalid parameter type %s for menu item", args[i]->DescriptiveName());
						}
						if (sc.CheckString(","))
						{
							if (i == args.Size() - 1)
							{
								sc.ScriptError("Too many parameters for %s", cls->TypeName.GetChars());
							}
						}
						else
						{
							if (i < args.Size() - 1 && !(func->Variants[0].ArgFlags[i + 1] & VARF_Optional))
							{
								sc.ScriptError("Insufficient parameters for %s", cls->TypeName.GetChars());
							}
							break;
						}
					}
					DMenuItemBase *item = (DMenuItemBase*)cls->CreateNew();
					params[0] = item;
					VMCallWithDefaults(func->Variants[0].Implementation, params, nullptr, 0);

					if (!inserting)
					{
						desc->mItems.Push(item);
					}
					else
					{
						// [Player701] Insert item in between
						desc->mItems.Insert(insertIndex, item);
						insertIndex++;
					}

					if (isSelectable)
					{
						if (inserting)
						{
							// [Player701] If we've inserted a selectable item, 
							// shift all following selectable items downwards
							// NB: index has been incremented, so we're not affecting the newly inserted item here.
							for (unsigned int i = insertIndex; i < desc->mItems.Size(); i++)
							{
								auto litem = desc->mItems[i];
								if (litem->GetClass()->IsDescendantOf("ListMenuItemSelectable"))
								{
									desc->mItems[i]->mYpos += desc->mLinespacing;
								}
							}
						}

						desc->mYpos = oldYpos + desc->mLinespacing;
						if (desc->mSelectedItem == -1) desc->mSelectedItem = desc->mItems.Size() - 1;
					}
					success = true;
				}
			}
			if (!success)
			{
				sc.ScriptError("Unknown keyword '%s'", sc.String);
			}
		}
	}
	for (auto &p : desc->mItems)
	{
		GC::WriteBarrier(p);
	}
}

static void ParseListMenuBody(FScanner& sc, DListMenuDescriptor* desc, int insertIndex)
{
	bool sizecompatible = true;
	DoParseListMenuBody(sc, desc, sizecompatible, insertIndex);
	if (!desc->mCustomSizeSet && !sizecompatible)
	{
		// No custom size and incompatible items, 
		// so force clean scaling for this menu
		desc->mVirtWidth = -1;
	}
}

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

static bool CheckCompatible(DMenuDescriptor *newd, DMenuDescriptor *oldd)
{
	if (oldd->mClass == nullptr) return true;
	return newd->mClass->IsDescendantOf(oldd->mClass);
}

static int GetGroup(DMenuItemBase *desc)
{
	if (desc->IsKindOf(NAME_OptionMenuItemCommand)) return 2;
	if (desc->IsKindOf(NAME_OptionMenuItemSubmenu)) return 1;
	if (desc->IsKindOf(NAME_OptionMenuItemControlBase)) return 3;
	if (desc->IsKindOf(NAME_OptionMenuItemOptionBase)) return 4;
	if (desc->IsKindOf(NAME_OptionMenuSliderBase)) return 4;
	if (desc->IsKindOf(NAME_OptionMenuFieldBase)) return 4;
	if (desc->IsKindOf(NAME_OptionMenuItemColorPicker)) return 4;
	if (desc->IsKindOf(NAME_OptionMenuItemStaticText)) return 5;
	if (desc->IsKindOf(NAME_OptionMenuItemStaticTextSwitchable)) return 5;
	return 0;
}

static bool FindMatchingItem(DMenuItemBase *desc)
{
	int grp = GetGroup(desc);
	if (grp == 0) return false;	// no idea what this is.
	if (grp == 5) return true;	// static texts always match

	FName name = desc->mAction;

	if (grp == 1)
	{
		// Check for presence of menu
		auto menu = MenuDescriptors.CheckKey(name);
		if (menu == nullptr) return false;
	}
	else if (grp == 4)
	{
		static const FName CVarBlacklist[] = {
			NAME_snd_waterlp, NAME_snd_output, NAME_snd_output_format, NAME_snd_speakermode, NAME_snd_resampler, NAME_AlwaysRun };

		// Check for presence of CVAR and blacklist
		auto cv = FindCVar(name.GetChars(), nullptr);
		if (cv == nullptr) return true;

		for (auto bname : CVarBlacklist)
		{
			if (name == bname) return true;
		}
	}

	MenuDescriptorList::Iterator it(MenuDescriptors);
	MenuDescriptorList::Pair *pair;
	while (it.NextPair(pair))
	{
		for (auto item : pair->Value->mItems)
		{
			if (item->mAction == name && GetGroup(item) == grp) return true;
		}
	}
	return false;
}

static bool ReplaceMenu(FScanner &sc, DMenuDescriptor *desc)
{
	DMenuDescriptor **pOld = MenuDescriptors.CheckKey(desc->mMenuName);
	if (pOld != nullptr && *pOld != nullptr) 
	{
		if ((*pOld)->mProtected)
		{
			// If this tries to replace an option menu with an option menu, let's append all new entries to the old menu.
			// Otherwise bail out because for list menus it's not that simple.
			if (!desc->IsKindOf(RUNTIME_CLASS(DOptionMenuDescriptor)) || !(*pOld)->IsKindOf(RUNTIME_CLASS(DOptionMenuDescriptor)))
			{
				sc.ScriptMessage("Cannot replace protected menu %s.", desc->mMenuName.GetChars());
				return true;
			}
			for (int i = desc->mItems.Size()-1; i >= 0; i--)
			{
				if (FindMatchingItem(desc->mItems[i]))
				{
					desc->mItems.Delete(i);
				}
			}
			if (desc->mItems.Size() > 0)
			{
				auto sep = CreateOptionMenuItemStaticText(" ");
				(*pOld)->mItems.Push(sep);
				sep = CreateOptionMenuItemStaticText("---------------", 1);
				(*pOld)->mItems.Push(sep);
				for (auto it : desc->mItems)
				{
					(*pOld)->mItems.Push(it);
				}
				desc->mItems.Clear();
				//sc.ScriptMessage("Merged %d items into %s", desc->mItems.Size(), desc->mMenuName.GetChars());
			}
			return true;
		}

		if (!CheckCompatible(desc, *pOld))
		{
			sc.ScriptMessage("Tried to replace menu '%s' with a menu of different type", desc->mMenuName.GetChars());
			return true;
		}
	}
	MenuDescriptors[desc->mMenuName] = desc;
	GC::WriteBarrier(desc);
	return false;
}

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

static void ParseListMenu(FScanner &sc)
{
	sc.MustGetString();

	DListMenuDescriptor *desc = Create<DListMenuDescriptor>();
	desc->Reset();
	desc->mMenuName = sc.String;
	desc->mSelectedItem = -1;
	desc->mAutoselect = -1;
	desc->mSelectOfsX = DefaultListMenuSettings->mSelectOfsX;
	desc->mSelectOfsY = DefaultListMenuSettings->mSelectOfsY;
	desc->mSelector = DefaultListMenuSettings->mSelector;
	desc->mDisplayTop = DefaultListMenuSettings->mDisplayTop;
	desc->mXpos = DefaultListMenuSettings->mXpos;
	desc->mYpos = DefaultListMenuSettings->mYpos;
	desc->mLinespacing = DefaultListMenuSettings->mLinespacing;
	desc->mNetgameMessage = DefaultListMenuSettings->mNetgameMessage;
	desc->mFont = DefaultListMenuSettings->mFont;
	desc->mFontColor = DefaultListMenuSettings->mFontColor;
	desc->mFontColor2 = DefaultListMenuSettings->mFontColor2;
	desc->mClass = nullptr;
	desc->mWLeft = 0;
	desc->mWRight = 0;
	desc->mCenter = false;
	desc->mFromEngine = fileSystem.GetFileContainer(sc.LumpNum) == 0;	// flags menu if the definition is from the IWAD.
	desc->mVirtWidth = -2;
	desc->mCustomSizeSet = false;
	desc->mAnimatedTransition = false;
	desc->mAnimated = false;
	desc->mDontDim = false;
	desc->mDontBlur = false;
	desc->mForceList = false;
	if (DefaultListMenuSettings->mCustomSizeSet)
	{
		desc->mVirtHeight = DefaultListMenuSettings->mVirtHeight;
		desc->mVirtWidth = DefaultListMenuSettings->mVirtWidth;
		desc->mCustomSizeSet = true;
	}

	ParseListMenuBody(sc, desc, -1);
	ReplaceMenu(sc, desc);
}

//=============================================================================
//
// [Player701] Common function for figuring out where to insert items
// for AddListMenu and AddOptionMenu
//
//=============================================================================

static int GetInsertIndex(FScanner& sc, DMenuDescriptor* desc)
{
	bool before = sc.CheckString("BEFORE");
	bool after = sc.CheckString("AFTER");

	int insertIndex = -1;

	if (before || after)
	{
		// Find an existing menu item to use as insertion point
		sc.MustGetString();

		int n = desc->mItems.Size();
		for (int i = 0; i < n; i++)
		{
			auto item = desc->mItems[i];

			if (item->mAction == sc.String)
			{
				insertIndex = before ? i : i + 1;
				break;
			}
		}

		// Inserting after the last item is the same as inserting at the end
		if (insertIndex == n) insertIndex = -1;

		// Don't error out if we haven't found a suitable item
		// to avoid backwards compatibility issues.
	}

	return insertIndex;
}

//=============================================================================
//
// [Player701] Allow extending list menus
//
//=============================================================================

static void ParseAddListMenu(FScanner& sc)
{
	sc.MustGetString();

	DMenuDescriptor** pOld = MenuDescriptors.CheckKey(sc.String);
	if (pOld == nullptr || *pOld == nullptr || !(*pOld)->IsKindOf(RUNTIME_CLASS(DListMenuDescriptor)))
	{
		sc.ScriptError("%s is not a list menu that can be extended", sc.String);
		return;
	}
	ParseListMenuBody(sc, (DListMenuDescriptor*)(*pOld), GetInsertIndex(sc, *pOld));
}

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

static void ParseOptionValue(FScanner &sc)
{
	FOptionValues *val = new FOptionValues;
	sc.MustGetString();
	FName optname = sc.String;
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		FOptionValues::Pair &pair = val->mValues[val->mValues.Reserve(1)];
		sc.MustGetFloat();
		pair.Value = sc.Float;
		sc.MustGetStringName(",");
		sc.MustGetString();
		pair.Text = strbin1(sc.String);
	}
	FOptionValues **pOld = OptionValues.CheckKey(optname);
	if (pOld != nullptr && *pOld != nullptr) 
	{
		delete *pOld;
	}
	OptionValues[optname] = val;
}


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

static void ParseOptionString(FScanner &sc)
{
	FOptionValues *val = new FOptionValues;
	sc.MustGetString();
	FName optname = sc.String;
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		FOptionValues::Pair &pair = val->mValues[val->mValues.Reserve(1)];
		sc.MustGetString();
		pair.Value = DBL_MAX;
		pair.TextValue = sc.String;
		sc.MustGetStringName(",");
		sc.MustGetString();
		pair.Text = strbin1(sc.String);
	}
	FOptionValues **pOld = OptionValues.CheckKey(optname);
	if (pOld != nullptr && *pOld != nullptr) 
	{
		delete *pOld;
	}
	OptionValues[optname] = val;
}


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

static void ParseOptionSettings(FScanner &sc)
{
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		sc.MustGetString();
		if (sc.Compare("else"))
		{
			SkipSubBlock(sc);
		}
		else if (sc.Compare("ifgame"))
		{
			if (!CheckSkipGameBlock(sc))
			{
				// recursively parse sub-block
				ParseOptionSettings(sc);
			}
		}
		else if (sc.Compare("ifnotgame"))
		{
			if (!CheckSkipGameBlock(sc, false))
			{
				// recursively parse sub-block
				ParseOptionSettings(sc);
			}
		}
		else if (sc.Compare("Linespacing"))
		{
			sc.MustGetNumber();
			// ignored
		}
		else if (sc.Compare("LabelOffset"))
		{
			sc.MustGetNumber();
			// ignored
		}
		else
		{
			sc.ScriptError("Unknown keyword '%s'", sc.String);
		}
	}
}

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

static void ParseOptionMenuBody(FScanner &sc, DOptionMenuDescriptor *desc, int insertIndex)
{
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		sc.MustGetString();
		if (sc.Compare("else"))
		{
			SkipSubBlock(sc);
		}
		else if (sc.Compare("ifgame"))
		{
			if (!CheckSkipGameBlock(sc))
			{
				// recursively parse sub-block
				ParseOptionMenuBody(sc, desc, insertIndex);
			}
		}
		else if (sc.Compare("ifnotgame"))
		{
			if (!CheckSkipGameBlock(sc, false))
			{
				// recursively parse sub-block
				ParseOptionMenuBody(sc, desc, insertIndex);
			}
		}
		else if (sc.Compare("ifoption"))
		{
			if (!CheckSkipOptionBlock(sc))
			{
				// recursively parse sub-block
				ParseOptionMenuBody(sc, desc, insertIndex);
			}
		}
		else if (sc.Compare("Class"))
		{
			sc.MustGetString();
			PClass *cls = PClass::FindClass(sc.String);
			if (cls == nullptr || !cls->IsDescendantOf("OptionMenu"))
			{
				sc.ScriptError("Unknown menu class '%s'", sc.String);
			}
			desc->mClass = cls;
		}
		else if (sc.Compare({ "Title", "Caption" }))
		{
			sc.MustGetString();
			desc->mTitle = sc.String;
		}
		else if (sc.Compare("Position"))
		{
			sc.MustGetNumber();
			desc->mPosition = sc.Number;
		}
		else if (sc.Compare("DefaultSelection"))
		{
			sc.MustGetNumber();
			desc->mSelectedItem = sc.Number;
		}
		else if (sc.Compare("ScrollTop"))
		{
			sc.MustGetNumber();
			desc->mScrollTop = sc.Number;
		}
		else if (sc.Compare("Indent"))
		{
			sc.MustGetNumber();
			desc->mIndent = sc.Number;
		}
		else if (sc.Compare("AnimatedTransition"))
		{
			desc->mAnimatedTransition = true;
		}
		else if (sc.Compare("Animated"))
		{
			desc->mAnimated = true;
		}
		else if (sc.Compare("DontDim"))
		{
			desc->mDontDim = true;
		}
		else if (sc.Compare("DontBlur"))
		{
			desc->mDontBlur = true;
		}
		else
		{
			bool success = false;
			FStringf buildname("OptionMenuItem%s", sc.String);
			// Handle one special case: MapControl maps to Control with one parameter different
			PClass *cls = PClass::FindClass(buildname);
			if (cls != nullptr && cls->IsDescendantOf("OptionMenuItem"))
			{
				auto func = dyn_cast<PFunction>(cls->FindSymbol("Init", true));
				if (func != nullptr && !(func->Variants[0].Flags & (VARF_Protected | VARF_Private)))	// skip internal classes which have a protexted init method.
				{
					auto &args = func->Variants[0].Proto->ArgumentTypes;
					TArray<VMValue> params;
					int start = 1;

					params.Push(0);
					if (args.Size() > 1 && args[1] == NewPointer(PClass::FindClass("OptionMenuDescriptor")))
					{
						params.Push(desc);
						start = 2;
					}
					auto TypeCVar = NewPointer(NewStruct("CVar", nullptr, true));

					// Note that this array may not be reallocated so its initial size must be the maximum possible elements.
					TArray<FString> strings(args.Size());
					for (unsigned i = start; i < args.Size(); i++)
					{
						sc.MustGetString();
						if (args[i] == TypeString)
						{
							strings.Push(sc.String);
							params.Push(&strings.Last());
						}
						else if (args[i] == TypeName)
						{
							params.Push(FName(sc.String).GetIndex());
						}
						else if (args[i] == TypeColor)
						{
							params.Push(V_GetColor(sc));
						}
						else if (args[i] == TypeFont)
						{
							auto f = V_GetFont(sc.String);
							if (f == nullptr)
							{
								sc.ScriptError("Unknown font %s", sc.String);
							}
							params.Push(f);
						}
						else if (args[i] == TypeTextureID)
						{
							auto f = TexMan.CheckForTexture(sc.String, ETextureType::MiscPatch);
							if (!f.Exists())
							{
								sc.ScriptMessage("Unknown texture %s", sc.String);
							}
							params.Push(f.GetIndex());
						}
						else if (args[i]->isIntCompatible())
						{
							char *endp;
							int v = (int)strtoll(sc.String, &endp, 0);
							if (*endp != 0)
							{
								// special check for font color ranges.
								v = V_FindFontColor(sc.String);
								if (v == CR_UNTRANSLATED && !sc.Compare("untranslated"))
								{
									// todo: check other data types that may get used.
									sc.ScriptError("Integer expected, got %s", sc.String);
								}
								// Color ranges need to be marked for option menu items to support an older feature where a boolean number could be passed instead.
								v |= 0x12340000;
							}
							if (args[i] == TypeBool) v = !!v;
							params.Push(v);
						}
						else if (args[i]->isFloat())
						{
							char *endp;
							double v = strtod(sc.String, &endp);
							if (*endp != 0)
							{
								sc.ScriptError("Float expected, got %s", sc.String);
							}
							params.Push(v);
						}
						else if (args[i] == TypeCVar)
						{
							auto cv = FindCVar(sc.String, nullptr);
							if (cv == nullptr && *sc.String)
							{
									if (func->Variants[0].ArgFlags[i] & VARF_Optional)
										sc.ScriptMessage("Unknown CVar %s", sc.String);
									else
										sc.ScriptError("Unknown CVar %s", sc.String);
							}
							params.Push(cv);
						}
						else
						{
							sc.ScriptError("Invalid parameter type %s for menu item", args[i]->DescriptiveName());
						}
						if (sc.CheckString(","))
						{
							if (i == args.Size() - 1)
							{
								sc.ScriptError("Too many parameters for %s", cls->TypeName.GetChars());
							}
						}
						else
						{
							if (i < args.Size() - 1 && !(func->Variants[0].ArgFlags[i + 1] & VARF_Optional))
							{
								sc.ScriptError("Insufficient parameters for %s", cls->TypeName.GetChars());
							}
							break;
						}
					}

					DMenuItemBase *item = (DMenuItemBase*)cls->CreateNew();
					params[0] = item;
					VMCallWithDefaults(func->Variants[0].Implementation, params, nullptr, 0);

					if (insertIndex == -1)
					{
						desc->mItems.Push(item);
					}
					else
					{
						desc->mItems.Insert(insertIndex, item);
						insertIndex++;
					}

					success = true;
				}
			}
			if (!success)
			{
				sc.ScriptError("Unknown keyword '%s'", sc.String);
			}
		}
	}
	for (auto &p : desc->mItems)
	{
		GC::WriteBarrier(p);
	}
}

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

static void ParseOptionMenu(FScanner &sc)
{
	sc.MustGetString();

	DOptionMenuDescriptor *desc = Create<DOptionMenuDescriptor>();
	desc->mFont = BigUpper;
	desc->mMenuName = sc.String;
	desc->mSelectedItem = -1;
	desc->mScrollPos = 0;
	desc->mClass = nullptr;
	desc->mPosition = DefaultOptionMenuSettings->mPosition;
	desc->mScrollTop = DefaultOptionMenuSettings->mScrollTop;
	desc->mIndent =  DefaultOptionMenuSettings->mIndent;
	desc->mDontDim = false;
	desc->mDontBlur = false;
	desc->mAnimatedTransition = false;
	desc->mAnimated = false;
	desc->mProtected = sc.CheckString("protected");

	ParseOptionMenuBody(sc, desc, -1);
	ReplaceMenu(sc, desc);
}


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

static void ParseAddOptionMenu(FScanner &sc)
{
	sc.MustGetString();

	DMenuDescriptor **pOld = MenuDescriptors.CheckKey(sc.String);
	if (pOld == nullptr || *pOld == nullptr || !(*pOld)->IsKindOf(RUNTIME_CLASS(DOptionMenuDescriptor)))
	{
		sc.ScriptError("%s is not an option menu that can be extended", sc.String);
		return;
	}
	ParseOptionMenuBody(sc, (DOptionMenuDescriptor*)(*pOld), GetInsertIndex(sc, *pOld));
}


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

static void ParseImageScrollerBody(FScanner& sc, DImageScrollerDescriptor* desc)
{
	sc.MustGetStringName("{");
	while (!sc.CheckString("}"))
	{
		sc.MustGetString();
		if (sc.Compare("else"))
		{
			SkipSubBlock(sc);
		}
		else if (sc.Compare("ifgame"))
		{
			if (!CheckSkipGameBlock(sc))
			{
				// recursively parse sub-block
				ParseImageScrollerBody(sc, desc);
			}
		}
		else if (sc.Compare("ifnotgame"))
		{
			if (!CheckSkipGameBlock(sc, false))
			{
				// recursively parse sub-block
				ParseImageScrollerBody(sc, desc);
			}
		}
		else if (sc.Compare("ifoption"))
		{
			if (!CheckSkipOptionBlock(sc))
			{
				// recursively parse sub-block
				ParseImageScrollerBody(sc, desc);
			}
		}
		else if (sc.Compare("Class"))
		{
			sc.MustGetString();
			PClass* cls = PClass::FindClass(sc.String);
			if (cls == nullptr || !cls->IsDescendantOf("ImageScrollerMenu"))
			{
				sc.ScriptError("Unknown menu class '%s'", sc.String);
			}
			desc->mClass = cls;
		}
		else if (sc.Compare("animatedtransition"))
		{
			desc->mAnimatedTransition = true;
		}
		else if (sc.Compare("animated"))
		{
			desc->mAnimated = true;
		}
		else if (sc.Compare("DontDim"))
		{
			desc->mDontDim = true;
		}
		else if (sc.Compare("DontBlur"))
		{
			desc->mDontBlur = true;
		}
		else if (sc.Compare("textBackground"))
		{
			sc.MustGetString();
			desc->textBackground = GetMenuTexture(sc.String);
		}
		else if (sc.Compare("textBackgroundBrightness"))
		{
			sc.MustGetFloat();
			int bb = clamp(int(sc.Float * 255), 0, 255);
			desc->textBackgroundBrightness = PalEntry(255, bb, bb, bb);
		}
		else if (sc.Compare("textScale"))
		{
			sc.MustGetFloat();
			desc->textScale = sc.Float;
		}
		else if (sc.Compare("textFont"))
		{
			sc.MustGetString();
			FFont* newfont = V_GetFont(sc.String);
			if (newfont != nullptr) desc->textFont = newfont;
		}
		else
		{
			bool success = false;
			FStringf buildname("ImageScrollerPage%s", sc.String);
			// Handle one special case: MapControl maps to Control with one parameter different
			PClass* cls = PClass::FindClass(buildname);
			if (cls != nullptr && cls->IsDescendantOf("ImageScrollerPage"))
			{
				auto func = dyn_cast<PFunction>(cls->FindSymbol("Init", true));
				if (func != nullptr && !(func->Variants[0].Flags & (VARF_Protected | VARF_Private)))	// skip internal classes which have a protected init method.
				{
					auto& args = func->Variants[0].Proto->ArgumentTypes;
					TArray<VMValue> params;

					int start = 1;

					params.Push(0);
					if (args.Size() > 1 && args[1] == NewPointer(PClass::FindClass("ImageScrollerDescriptor")))
					{
						params.Push(desc);
						start = 2;
					}
					auto TypeCVar = NewPointer(NewStruct("CVar", nullptr, true));

					// Note that this array may not be reallocated so its initial size must be the maximum possible elements.
					TArray<FString> strings(args.Size());
					for (unsigned i = start; i < args.Size(); i++)
					{
						sc.MustGetString();
						if (args[i] == TypeString)
						{
							strings.Push(sc.String);
							params.Push(&strings.Last());
						}
						else if (args[i] == TypeName)
						{
							params.Push(FName(sc.String).GetIndex());
						}
						else if (args[i] == TypeColor)
						{
							params.Push(V_GetColor(sc));
						}
						else if (args[i] == TypeFont)
						{
							auto f = V_GetFont(sc.String);
							if (f == nullptr)
							{
								sc.ScriptError("Unknown font %s", sc.String);
							}
							params.Push(f);
						}
						else if (args[i] == TypeTextureID)
						{
							auto f = TexMan.CheckForTexture(sc.String, ETextureType::MiscPatch);
							if (!f.Exists())
							{
								sc.ScriptMessage("Unknown texture %s", sc.String);
							}
							params.Push(f.GetIndex());
						}
						else if (args[i]->isIntCompatible())
						{
							char* endp;
							int v = (int)strtoll(sc.String, &endp, 0);
							if (*endp != 0)
							{
								// special check for font color ranges.
								v = V_FindFontColor(sc.String);
								if (v == CR_UNTRANSLATED && !sc.Compare("untranslated"))
								{
									// todo: check other data types that may get used.
									sc.ScriptError("Integer expected, got %s", sc.String);
								}
							}
							if (args[i] == TypeBool) v = !!v;
							params.Push(v);
						}
						else if (args[i]->isFloat())
						{
							char* endp;
							double v = strtod(sc.String, &endp);
							if (*endp != 0)
							{
								sc.ScriptError("Float expected, got %s", sc.String);
							}
							params.Push(v);
						}
						else if (args[i] == TypeCVar)
						{
							auto cv = FindCVar(sc.String, nullptr);
							if (cv == nullptr && *sc.String)
							{
								if (func->Variants[0].ArgFlags[i] & VARF_Optional)
									sc.ScriptMessage("Unknown CVar %s", sc.String);
								else
									sc.ScriptError("Unknown CVar %s", sc.String);
							}
							params.Push(cv);
						}
						else
						{
							sc.ScriptError("Invalid parameter type %s for image page", args[i]->DescriptiveName());
						}
						if (sc.CheckString(","))
						{
							if (i == args.Size() - 1)
							{
								sc.ScriptError("Too many parameters for %s", cls->TypeName.GetChars());
							}
						}
						else
						{
							if (i < args.Size() - 1 && !(func->Variants[0].ArgFlags[i + 1] & VARF_Optional))
							{
								sc.ScriptError("Insufficient parameters for %s", cls->TypeName.GetChars());
							}
							break;
						}
					}

					DMenuItemBase* item = (DMenuItemBase*)cls->CreateNew();
					params[0] = item;
					VMCallWithDefaults(func->Variants[0].Implementation, params, nullptr, 0);
					desc->mItems.Push((DMenuItemBase*)item);

					success = true;
				}
			}
			if (!success)
			{
				sc.ScriptError("Unknown keyword '%s'", sc.String);
			}
		}
	}
}

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

static void ParseImageScroller(FScanner& sc)
{
	sc.MustGetString();

	DImageScrollerDescriptor* desc = Create<DImageScrollerDescriptor>();

	desc->mMenuName = sc.String;
	desc->textBackground.SetInvalid();
	desc->textBackgroundBrightness = 0xffffffff;
	desc->textFont = SmallFont;
	desc->textScale = 1;
	desc->mDontDim = false;
	desc->mDontBlur = false;
	desc->mAnimatedTransition = false;
	desc->mAnimated = false;
	desc->virtWidth = 320;
	desc->virtHeight = 200;

	ParseImageScrollerBody(sc, desc);
	bool scratch = ReplaceMenu(sc, desc);
	if (scratch) delete desc;
}


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

void M_ParseMenuDefs()
{
	int lump, lastlump = 0;

	// these are supposed to get GC'd after parsing is complete.
	DefaultListMenuSettings = Create<DListMenuDescriptor>();
	DefaultOptionMenuSettings = Create<DOptionMenuDescriptor>();
	DefaultListMenuSettings->Reset();
	DefaultOptionMenuSettings->Reset();
	OptionSettings.mLinespacing = 17;

	int IWADMenu = fileSystem.CheckNumForName("MENUDEF", FileSys::ns_global, fileSystem.GetIwadNum());

	while ((lump = fileSystem.FindLump ("MENUDEF", &lastlump)) != -1)
	{
		FScanner sc(lump);

		mustPrintErrors = lump >= IWADMenu;
		sc.SetCMode(true);
		while (sc.GetString())
		{
			if (sc.Compare("LISTMENU"))
			{
				ParseListMenu(sc);
			}
			else if (sc.Compare("DEFAULTLISTMENU"))
			{
				bool s = false;
				DoParseListMenuBody(sc, DefaultListMenuSettings, s, -1);
				if (DefaultListMenuSettings->mItems.Size() > 0)
				{
					I_FatalError("You cannot add menu items to the menu default settings.");
				}
			}
			else if (sc.Compare("ADDLISTMENU"))
			{
				ParseAddListMenu(sc);
			}
			else if (sc.Compare("OPTIONVALUE"))
			{
				ParseOptionValue(sc);
			}
			else if (sc.Compare("OPTIONSTRING"))
			{
				ParseOptionString(sc);
			}
			else if (sc.Compare("OPTIONMENUSETTINGS"))
			{
				ParseOptionSettings(sc);
			}
			else if (sc.Compare("OPTIONMENU"))
			{
				ParseOptionMenu(sc);
			}
			else if (sc.Compare("ADDOPTIONMENU"))
			{
				ParseAddOptionMenu(sc);
			}
			else if (sc.Compare("DEFAULTOPTIONMENU"))
			{
				ParseOptionMenuBody(sc, DefaultOptionMenuSettings, -1);
				if (DefaultOptionMenuSettings->mItems.Size() > 0)
				{
					I_FatalError("You cannot add menu items to the menu default settings.");
				}
			}
			else if (sc.Compare("IMAGESCROLLER"))
			{
				ParseImageScroller(sc);
			}
			else
			{
				sc.ScriptError("Unknown keyword '%s'", sc.String);
			}
		}
		if (Args->CheckParm("-nocustommenu")) break;
	}
	DefaultListMenuClass = DefaultListMenuSettings->mClass;
	DefaultListMenuSettings = nullptr;
	DefaultOptionMenuClass = DefaultOptionMenuSettings->mClass;
	DefaultOptionMenuSettings = nullptr;
}


//=============================================================================
//
// Initialize the music configuration submenus
//
//=============================================================================
extern "C"
{
	extern int adl_getBanksCount();
	extern const char *const *adl_getBankNames();
}

static void InitMusicMenus()
{
	DMenuDescriptor **advmenu = MenuDescriptors.CheckKey("AdvSoundOptions");
	auto soundfonts = sfmanager.GetList();
	std::tuple<const char *, int, const char *> sfmenus[] = { std::make_tuple("GusConfigMenu", SF_GUS, "midi_config"),
																std::make_tuple("WildMidiConfigMenu", SF_GUS, "wildmidi_config"),
																std::make_tuple("TimidityConfigMenu", SF_SF2 | SF_GUS, "timidity_config"),
																std::make_tuple("FluidPatchsetMenu", SF_SF2, "fluid_patchset"),
																std::make_tuple("ADLMIDICustomBanksMenu", SF_WOPL, "adl_custom_bank"),
																std::make_tuple("OPNMIDICustomBanksMenu", SF_WOPN, "opn_custom_bank")};

	for (auto &p : sfmenus)
	{
		DMenuDescriptor **menu = MenuDescriptors.CheckKey(std::get<0>(p));

		if (menu != nullptr)
		{
			if (soundfonts.Size() > 0)
			{
				for (auto &entry : soundfonts)
				{
					if (entry.type & std::get<1>(p))
					{
						FString display = entry.mName;
						display.ReplaceChars("_", ' ');
						auto it = CreateOptionMenuItemCommand(display.GetChars(), FStringf("%s \"%s\"", std::get<2>(p), entry.mName.GetChars()), true);
						static_cast<DOptionMenuDescriptor*>(*menu)->mItems.Push(it);
					}
				}
			}
			else if (advmenu != nullptr)
			{
				// Remove the item for this submenu
				auto d = static_cast<DOptionMenuDescriptor*>(*advmenu);
				auto it = d->GetItem(std::get<0>(p));
				if (it != nullptr) d->mItems.Delete(d->mItems.Find(it));
			}
		}
	}

	DMenuDescriptor **menu = MenuDescriptors.CheckKey("ADLBankMenu");

	if (menu != nullptr)
	{
		const char* const* adl_bank_names;
		int adl_banks_count = ZMusic_GetADLBanks(&adl_bank_names);
		for (int i=0; i < adl_banks_count; i++)
		{
			auto it = CreateOptionMenuItemCommand(adl_bank_names[i], FStringf("adl_bank %d", i), true);
			static_cast<DOptionMenuDescriptor*>(*menu)->mItems.Push(it);
		}
	}
}

//=============================================================================
//
// Special menus will be created once all engine data is loaded
//
//=============================================================================
void I_BuildMIDIMenuList(FOptionValues*);

void M_CreateMenus()
{
	InitMusicMenus();
	FOptionValues **opt = OptionValues.CheckKey(NAME_Mididevices);
	if (opt != nullptr) 
	{
		I_BuildMIDIMenuList(*opt);
	}
	opt = OptionValues.CheckKey(NAME_Aldevices);
	if (opt != nullptr) 
	{
		I_BuildALDeviceList(*opt);
	}
	opt = OptionValues.CheckKey(NAME_Alresamplers);
	if (opt != nullptr)
	{
		I_BuildALResamplersList(*opt);
	}
}