(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uTypes;

(*

 * This unit defines various types and enumerations for usage in different

 * places in the engine code.

 *)

interface

uses SDLh, uFloat, GLunit, uConsts, Math;

// NOTE: typed const is a variable despite const qualifier

// in freepascal you may actually use var for the same purpose

type

    HwColor4f = record

        r, g, b, a: byte;

        end;

    // Possible states of the game

    TGameState = (gsLandGen, gsStart, gsGame, gsChat, gsConfirm, gsExit, gsSuspend);

    // Game types that help determining what the engine is actually supposed to do

    TGameType = (gmtLocal, gmtDemo, gmtNet, gmtSave, gmtLandPreview, gmtSyntax, gmtRecord);

    // Different files are stored in different folders, this enumeration is used to tell which folder to use

    TPathType = (ptNone, ptData, ptGraphics, ptThemes, ptCurrTheme, ptTeams, ptMaps,

            ptMapCurrent, ptDemos, ptSounds, ptGraves, ptFonts, ptForts, ptLocale,

            ptAmmoMenu, ptHedgehog, ptVoices, ptHats, ptFlags, ptMissionMaps,

            ptSuddenDeath, ptButtons, ptShaders);

    // Available sprites for displaying stuff

    TSprite = (sprWater, sprCloud, sprBomb, sprBigDigit, sprFrame,

            sprLag, sprArrow, sprBazookaShell, sprTargetP, sprBee,

            sprSmokeTrace, sprRopeHook, sprExplosion50, sprMineOff,

            sprMineOn, sprMineDead, sprCase, sprFAid, sprDynamite, sprPower,

            sprClusterBomb, sprClusterParticle, sprFlame,

            sprHorizont, sprHorizontL, sprHorizontR, sprSky, sprSkyL, sprSkyR,

            sprAMSlot, sprAMAmmos, sprAMAmmosBW, sprAMSlotKeys, sprAMCorners,

            sprFinger, sprAirBomb, sprAirplane, sprAmAirplane, sprAmGirder,

            sprHHTelepMask, sprSwitch, sprParachute, sprTarget, sprRopeNode,

            sprQuestion, sprPowerBar, sprWindBar, sprWindL, sprWindR,

{$IFDEF USE_TOUCH_INTERFACE}

            sprFireButton, sprArrowUp, sprArrowDown, sprArrowLeft, sprArrowRight,

            sprJumpWidget, sprAMWidget, sprPauseButton, sprTimerButton, sprTargetButton,

            sprSwitchButton,

{$ENDIF}

            sprFlake, sprHandRope, sprHandBazooka, sprHandShotgun,

            sprHandDEagle, sprHandAirAttack, sprHandBaseball, sprPHammer,

            sprHandBlowTorch, sprBlowTorch, sprTeleport, sprHHDeath,

            sprShotgun, sprDEagle, sprHHIdle, sprMortar, sprTurnsLeft,

            sprKamikaze, sprWhip, sprKowtow, sprSad, sprWave,

            sprHurrah, sprLemonade, sprShrug, sprJuggle, sprExplPart, sprExplPart2,

            sprCakeWalk, sprCakeDown, sprWatermelon,

            sprEvilTrace, sprHellishBomb, sprSeduction, sprDress,

            sprCensored, sprDrill, sprHandDrill, sprHandBallgun, sprBalls,

            sprPlane, sprHandPlane, sprUtility, sprInvulnerable, sprVampiric, sprGirder,

            sprSpeechCorner, sprSpeechEdge, sprSpeechTail,

            sprThoughtCorner, sprThoughtEdge, sprThoughtTail,

            sprShoutCorner, sprShoutEdge, sprShoutTail,

            sprSniperRifle, sprBubbles, sprJetpack, sprHealth, sprHandMolotov, sprMolotov,

            sprSmoke, sprSmokeWhite, sprShell, sprDust, sprSnowDust, sprExplosives, sprExplosivesRoll,

            sprAmTeleport, sprSplash, sprDroplet, sprBirdy, sprHandCake, sprHandConstruction,

            sprHandGrenade, sprHandMelon, sprHandMortar, sprHandSkip, sprHandCluster,

            sprHandDynamite, sprHandHellish, sprHandMine, sprHandSeduction, sprHandVamp,

            sprBigExplosion, sprSmokeRing, sprBeeTrace, sprEgg, sprTargetBee, sprHandBee,

            sprFeather, sprPiano, sprHandSineGun, sprPortalGun, sprPortal,

            sprCheese, sprHandCheese, sprHandFlamethrower, sprChunk, sprNote,

            sprSMineOff, sprSMineOn, sprHandSMine, sprHammer,

            sprHandResurrector, sprCross, sprAirDrill, sprNapalmBomb,

            sprBulletHit, sprSnowball, sprHandSnowball, sprSnow,

            sprSDFlake, sprSDWater, sprSDCloud, sprSDSplash, sprSDDroplet, sprTardis,

            sprSlider, sprBotlevels, sprHandKnife, sprKnife, sprStar, sprIceTexture, sprIceGun,

            sprFrozenHog, sprAmRubber, sprBoing, sprCustom1, sprCustom2, sprAirMine

            );

    // Gears that interact with other Gears and/or Land

    // first row of gears (<gtExplosives) should be avoided when searching a spawn place

    TGearType = (gtFlame, gtHedgehog, gtMine, gtCase, gtAirMine, gtExplosives, 

            gtGrenade, gtShell, gtGrave, gtBee, // 9

            gtShotgunShot, gtPickHammer, gtRope,  // 12

            gtDEagleShot, gtDynamite, gtClusterBomb, gtCluster, gtShover, // 17

            gtFirePunch, gtATStartGame, // 19

            gtATFinishGame, gtParachute, gtAirAttack, gtAirBomb, gtBlowTorch, // 24

            gtGirder, gtTeleport, gtSwitcher, gtTarget, gtMortar, // 29

            gtWhip, gtKamikaze, gtCake, gtSeduction, gtWatermelon, gtMelonPiece, // 35

            gtHellishBomb, gtWaterUp, gtDrill, gtBallGun, gtBall, gtRCPlane, // 41

            gtSniperRifleShot, gtJetpack, gtMolotov, gtBirdy, // 45

            gtEgg, gtPortal, gtPiano, gtGasBomb, gtSineGunShot, gtFlamethrower, // 51

            gtSMine, gtPoisonCloud, gtHammer, gtHammerHit, gtResurrector, // 56

            gtNapalmBomb, gtSnowball, gtFlake, {gtStructure,} gtLandGun, gtTardis, // 61

            gtIceGun, gtAddAmmo, gtGenericFaller, gtKnife); // 65

    // Gears that are _only_ of visual nature (e.g. background stuff, visual effects, speechbubbles, etc.)

    TVisualGearType = (vgtFlake, vgtCloud, vgtExplPart, vgtExplPart2, vgtFire,

            vgtSmallDamageTag, vgtTeamHealthSorter, vgtSpeechBubble, vgtBubble,

            vgtSteam, vgtAmmo, vgtSmoke, vgtSmokeWhite, vgtShell,

            vgtDust, vgtSplash, vgtDroplet, vgtSmokeRing, vgtBeeTrace, vgtEgg,

            vgtFeather, vgtHealthTag, vgtSmokeTrace, vgtEvilTrace, vgtExplosion,

            vgtBigExplosion, vgtChunk, vgtNote, vgtLineTrail, vgtBulletHit, vgtCircle,

            vgtSmoothWindBar, vgtStraightShot, vgtNoPlaceWarn);

    // Damage can be caused by different sources

    TDamageSource = (dsUnknown, dsFall, dsBullet, dsExplosion, dsShove, dsPoison);

    // Available sounds

    TSound = (sndNone,

            sndGrenadeImpact, sndExplosion, sndThrowPowerUp, sndThrowRelease,

            sndSplash, sndShotgunReload, sndShotgunFire, sndGraveImpact,

            sndMineImpact, sndMineTick, sndMudballImpact,

            sndPickhammer, sndGun, sndBee, sndJump1, sndJump2,

            sndJump3, sndYesSir, sndLaugh, sndIllGetYou, sndJustYouWait, sndIncoming,

            sndMissed, sndStupid, sndFirstBlood, sndBoring, sndByeBye,

            sndSameTeam, sndNutter, sndReinforce, sndTraitor, sndRegret,

            sndEnemyDown, sndCoward, sndHurry, sndWatchIt, sndKamikaze,

            sndCake, sndOw1, sndOw2, sndOw3, sndOw4, sndFirePunch1, sndFirePunch2,

            sndFirePunch3, sndFirePunch4, sndFirePunch5, sndFirePunch6,

            sndMelon, sndHellish, sndYoohoo, sndRCPlane, sndWhipCrack,

            sndRideOfTheValkyries, sndDenied, sndPlaced, sndBaseballBat,

            sndVaporize, sndWarp, sndSuddenDeath, sndMortar, sndShutter,

            sndHomerun, sndMolotov, sndCover, sndUhOh, sndOops,

            sndNooo, sndHello, sndRopeShot, sndRopeAttach, sndRopeRelease,

            sndSwitchHog, sndVictory, sndFlawless, sndSniperReload, sndSteps, sndLowGravity,

            sndHellishImpact1, sndHellishImpact2, sndHellishImpact3, sndHellishImpact4,

            sndMelonImpact, sndDroplet1, sndDroplet2, sndDroplet3, sndEggBreak, sndDrillRocket,

            sndPoisonCough, sndPoisonMoan, sndBirdyLay, sndWhistle, sndBeeWater,

            sndPiano0, sndPiano1, sndPiano2, sndPiano3, sndPiano4, sndPiano5, sndPiano6, sndPiano7,

            sndPiano8, sndSkip, sndSineGun, sndOoff1, sndOoff2, sndOoff3, sndWhack,

            sndComeonthen, sndParachute, sndBump, sndResurrector, sndPlane, sndTardis, sndFrozenHogImpact,

            sndIceBeam, sndHogFreeze

            );

    // Available ammo types to be used by hedgehogs

    TAmmoType  = (amNothing, amGrenade, amClusterBomb, amBazooka, amBee, amShotgun, amPickHammer, // 6

            amSkip, amRope, amMine, amDEagle, amDynamite, amFirePunch, amWhip, // 13

            amBaseballBat, amParachute, amAirAttack, amMineStrike, amBlowTorch, // 18

            amGirder, amTeleport, amSwitch, amMortar, amKamikaze, amCake, // 24

            amSeduction, amWatermelon, amHellishBomb, amNapalm, amDrill, amBallgun, // 30

            amRCPlane, amLowGravity, amExtraDamage, amInvulnerable, amExtraTime, // 35

            amLaserSight, amVampiric, amSniperRifle, amJetpack, amMolotov, amBirdy, amPortalGun, // 42

            amPiano, amGasBomb, amSineGun, amFlamethrower, amSMine, amHammer, // 48

            amResurrector, amDrillStrike, amSnowball, amTardis, {amStructure,} amLandGun, // 53

            amIceGun, amKnife, amRubber, amAirMine); // 57

    // Different kind of crates that e.g. hedgehogs can pick up

    TCrateType = (HealthCrate, AmmoCrate, UtilityCrate);

    THWFont = (fnt16, fntBig, fntSmall {$IFNDEF MOBILE}, CJKfnt16, CJKfntBig, CJKfntSmall{$ENDIF});

    TCapGroup = (capgrpGameState, capgrpAmmoinfo, capgrpVolume,

            capgrpMessage, capgrpMessage2, capgrpAmmostate);

    TStatInfoType = (siGameResult, siMaxStepDamage, siMaxStepKills, siKilledHHs,

            siClanHealth, siTeamStats, siPlayerKills, siMaxTeamDamage,

            siMaxTeamKills, siMaxTurnSkips, siCustomAchievement, siGraphTitle,

            siPointType);

    // Various 'emote' animations a hedgehog can do

    TWave = (waveRollup, waveSad, waveWave, waveHurrah, waveLemonade, waveShrug, waveJuggle);

    TRenderMode = (rmDefault, rmLeftEye, rmRightEye);

    TStereoMode = (smNone, smRedCyan, smCyanRed, smRedBlue, smBlueRed, smRedGreen, smGreenRed, smHorizontal, smVertical);

    TWorldEdge = (weNone, weWrap, weBounce, weSea, weSky);

    TUIDisplay = (uiAll, uiNoTeams, uiNone);

    TMapGen = (mgRandom, mgMaze, mgPerlin, mgDrawn);

    THHFont = record

            Handle: PTTF_Font;

            Height: LongInt;

            style: LongInt;

            Name: string[31];

            end;

    PAmmo = ^TAmmo;

    TAmmo = record

            Propz: LongWord;

            Count: LongWord;

// Using for place hedgehogs mode, but for any other situation where the initial count would be needed I guess.

// For example, say, a mode where the weaponset is reset each turn, or on sudden death

            NumPerTurn: LongWord;

            Timer: LongWord;

            Pos: LongWord;

            AmmoType: TAmmoType;

            AttackVoice: TSound;

            Bounciness: LongWord;

            end;

    TVertex2f = record

            X, Y: GLfloat;

            end;

    TVertex2i = record

            X, Y: GLint;

            end;

    TMatrix4x4f = array[0..3, 0..3] of GLfloat;

    PTexture = ^TTexture;

    TTexture = record

            id: GLuint;

            w, h, scale: LongInt;

            rx, ry: GLfloat;

            priority: GLfloat;

            vb, tb: array [0..3] of TVertex2f;

            PrevTexture, NextTexture: PTexture;

            end;

    THogEffect = (heInvulnerable, heResurrectable, hePoisoned, heResurrected, heFrozen);

    TScreenFade = (sfNone, sfInit, sfToBlack, sfFromBlack, sfToWhite, sfFromWhite);

    PGear = ^TGear;

    PHedgehog = ^THedgehog;

    PTeam     = ^TTeam;

    PClan     = ^TClan;

    TGearStepProcedure = procedure (Gear: PGear);

// So, you are here looking for variables you can (ab)use to store some gear state?

// Not all members of this structure are created equal. Comments below are my take on what can be used for what in the gear structure.

    TGear = record

// Do *not* ever override these.

            NextGear, PrevGear: PGear;  // Linked list

            Z: Longword;                // Z index. For rendering. Sets order in list

            Active: Boolean;            // Is gear Active (running step code)

            Kind: TGearType;

            doStep: TGearStepProcedure; // Code the gear is running

            AmmoType : TAmmoType;       // Ammo type associated with this kind of gear

            RenderTimer: Boolean;       // Will visually display Timer if true

            Target : TPoint;            // Gear target. Will render in uGearsRender unless a special case is added

            AIHints: LongWord;          // hints for ai.

            LastDamage: PHedgehog;      // Used to track damage source for stats

            CollisionIndex: LongInt;    // Position in collision array

            Message: LongWord;          // Game messages are stored here. See gm bitmasks in uConsts

            uid: Longword;              // Lua use this to reference gears

            Hedgehog: PHedgehog;        // set to CurrentHedgehog on gear creation.  uStats damage code appears to assume it will never be nil and never be changed.  If you override it, make sure it is set to a non-nil PHedgehog before dealing damage.

// Strongly recommended not to override these.  Will mess up generic operations like portaling

            X : hwFloat;              // X/Y/dX/dY are position/velocity. People count on these having semi-normal values

            Y : hwFloat;

            dX: hwFloat;

            dY: hwFloat;

            State : Longword;        // See gst bitmask values in uConsts

            PortalCounter: LongWord; // Necessary to interrupt portal loops.  Not possible to avoid infinite loops without it.

// Don't use these if you're using generic movement like doStepFallingGear and explosion shoves. Generally recommended not to use.

            Radius: LongInt;     // Radius. If not using uCollisions, is usually used to indicate area of effect

            CollisionMask: Word; // Masking off Land impact  FF7F for example ignores current hog and crates

            AdvBounce: Longword; // Triggers 45 bounces. Is a counter to avoid edge cases

            Elasticity: hwFloat;

            Friction  : hwFloat;

            Density   : hwFloat; // Density is kind of a mix of size and density. Impacts distance thrown, wind.

            ImpactSound: TSound; // first sound, others have to be after it in the sounds def.

            nImpactSounds: Word; // count of ImpactSounds.

// Don't use these if you want to take damage normally, otherwise health/damage are commonly used for other purposes

            Health, Damage, Karma: LongInt;

// DirAngle is a 'real' - if you do not need it for rotation of sprite in uGearsRender, you can use it for any visual-only value

            DirAngle: real;

// These are frequently overridden to serve some other purpose

            Pos: Longword;           // Commonly overridden.  Example use is posCase values in uConsts.

            Angle, Power : Longword; // Used for hog aiming/firing.  Angle is rarely used as an Angle otherwise.

            Timer, WDTimer : LongWord;        // Typically used for some sort of gear timer. Time to explosion, remaining fuel...

            Tag: LongInt;            // Quite generic. Variety of uses.

            FlightTime: Longword;    // Initially added for batting of hogs to determine homerun. Used for some firing delays

            MsgParam: LongWord;      // Initially stored a set of messages. So usually gm values like Message. Frequently overriden

// These are not used generically, but should probably be used for purpose intended. Definitely shouldn't override pointer type

            Tex: PTexture;          // A texture created by the gear. Shouldn't use for anything but textures

            Tint: LongWord;         // Used to colour a texture

            LinkedGear: PGear;      // Used to track a related gear. Portal pairs for example.

            SoundChannel: LongInt;  // Used to track a sound the gear started

            Data: Pointer; // pointer to gear type specific data structure (if any)

            end;

    TPGearArray = array of PGear;

    PGearArrayS = record

        size: LongWord;

        ar: ^TPGearArray;

        end;

    PVisualGear = ^TVisualGear;

    TVGearStepProcedure = procedure (Gear: PVisualGear; Steps: Longword);

    TVisualGear = record

        NextGear, PrevGear: PVisualGear;

        Frame,

        FrameTicks: Longword;

        X : real;

        Y : real;

        dX: real;

        dY: real;

        tdX: real;

        tdY: real;

        State : Longword;

        Timer: Longword;

        Angle, dAngle: real;

        Kind: TVisualGearType;

        doStep: TVGearStepProcedure;

        Tex: PTexture;

        alpha, scale: GLfloat;

        Hedgehog: PHedgehog;

        Tag: LongInt;

        Text: shortstring;

        Tint: Longword;

        uid: Longword;

        Layer: byte;

        end;

    TStatistics = record

        DamageRecv,

        DamageGiven: Longword;

        StepDamageRecv,

        StepDamageGiven,

        StepKills: Longword;

        MaxStepDamageRecv,

        MaxStepDamageGiven,

        MaxStepKills: Longword;

        FinishedTurns: Longword;

        end;

    TTeamStats = record

        Kills : Longword;

        Suicides: Longword;

        AIKills : Longword;

        TeamKills : Longword;

        TurnSkips : Longword;

        TeamDamage : Longword;

        end;

    TBinds = array[0..cKbdMaxIndex] of shortstring;

    TKeyboardState = array[0..cKeyMaxIndex] of Byte;

    PVoicepack = ^TVoicepack;

    TVoicepack = record

        name: shortstring;

        chunks: array [TSound] of PMixChunk;

        end;

    TVoice = record

        snd: TSound;

        voicepack: PVoicePack;

        end;

    THHAmmo = array[0..cMaxSlotIndex, 0..cMaxSlotAmmoIndex] of TAmmo;

    PHHAmmo = ^THHAmmo;

    THedgehog = record

            Name: shortstring;

            Gear: PGear;

            GearHidden: PGear;

            SpeechGear: PVisualGear;

            NameTagTex,

            HealthTagTex,

            HatTex: PTexture;

            Ammo: PHHAmmo;

            CurAmmoType: TAmmoType;

            PickUpType: LongWord;

            PickUpDelay: LongInt;

            AmmoStore: Longword;

            Team: PTeam;

            MultiShootAttacks: Longword;

            visStepPos: LongWord;

            BotLevel  : Byte; // 0 - Human player

            HatVisibility: GLfloat;

            stats: TStatistics;

            Hat: shortstring;

            InitialHealth: LongInt; // used for gfResetHealth

            King: boolean;  // Flag for a bunch of hedgehog attributes

            Unplaced: boolean;  // Flag for hog placing mode

            Timer: Longword;

            HealthBarHealth: LongInt;

            Effects: array[THogEffect] of LongInt;

            end;

    TTeam = record

            Clan: PClan;

            TeamName: shortstring;

            ExtDriven: boolean;

            Binds: TBinds;

            Hedgehogs: array[0..cMaxHHIndex] of THedgehog;

            CurrHedgehog: LongWord;

            NameTagTex,

            OwnerTex,

            GraveTex,

            AIKillsTex,

            FlagTex: PTexture;

            Flag: shortstring;

            GraveName: shortstring;

            FortName: shortstring;

            Owner: shortstring;

            TeamHealth: LongInt;

            TeamHealthBarHealth: LongInt;

            DrawHealthY: LongInt;

            AttackBar: LongWord;

            HedgehogsNumber: Longword;

            voicepack: PVoicepack;

            PlayerHash: shortstring;   // md5 hash of player name. For temporary enabling of hats as thank you. Hashed for privacy of players

            stats: TTeamStats;

            hasGone: boolean;

            skippedTurns: Longword;

            isGoneFlagPendingToBeSet, isGoneFlagPendingToBeUnset: boolean;

            end;

    TClan = record

            Color: Longword;

            Teams: array[0..Pred(cMaxTeams)] of PTeam;

            HealthTex: PTexture;

            TeamsNumber: Longword;

            TagTeamIndex: Longword;

            CurrTeam: LongWord;

            ClanHealth: LongInt;

            ClanIndex: LongInt;

            TurnNumber: LongWord;

            Flawless: boolean;

            end;

     cdeclPtr = procedure; cdecl;

     cdeclIntPtr = procedure(num: LongInt); cdecl;

     funcDoublePtr = function: Double;

     TMobileRecord = record

                     PerformRumble: cdeclIntPtr;

                     GameLoading: cdeclPtr;

                     GameLoaded: cdeclPtr;

                     SaveLoadingEnded: cdeclPtr;

                     end;

     TAmmoStrId = (sidGrenade, sidClusterBomb, sidBazooka, sidBee, sidShotgun,

            sidPickHammer, sidSkip, sidRope, sidMine, sidDEagle,

            sidDynamite, sidBaseballBat, sidFirePunch, sidSeconds,

            sidParachute, sidAirAttack, sidMineStrike, sidBlowTorch,

            sidGirder, sidTeleport, sidSwitch, sidMortar, sidWhip,

            sidKamikaze, sidCake, sidSeduction, sidWatermelon,

            sidHellishBomb, sidDrill, sidBallgun, sidNapalm, sidRCPlane,

            sidLowGravity, sidExtraDamage, sidInvulnerable, sidExtraTime,

            sidLaserSight, sidVampiric, sidSniperRifle, sidJetpack,

            sidMolotov, sidBirdy, sidPortalGun, sidPiano, sidGasBomb,

            sidSineGun, sidFlamethrower,sidSMine, sidHammer, sidResurrector,

            sidDrillStrike, sidSnowball, sidNothing, sidTardis,

            {sidStructure,} sidLandGun, sidIceGun, sidKnife, sidRubber, sidAirMine);

    TMsgStrId = (sidStartFight, sidDraw, sidWinner, sidVolume, sidPaused,

            sidConfirm, sidSuddenDeath, sidRemaining, sidFuel, sidSync,

            sidNoEndTurn, sidNotYetAvailable, sidRoundSD, sidRoundsSD, sidReady,

            sidBounce1, sidBounce2, sidBounce3, sidBounce4, sidBounce5, sidBounce,

            sidMute, sidAFK, sidAutoCameraOff, sidAutoCameraOn, sidPressTarget);

    // Events that are important for the course of the game or at least interesting for other reasons

    TEventId = (eidDied, eidDrowned, eidRoundStart, eidRoundWin, eidRoundDraw,

            eidNewHealthPack, eidNewAmmoPack, eidNewUtilityPack, eidTurnSkipped,

            eidHurtSelf, eidHomerun, eidGone);

    TGoalStrId = (gidCaption, gidSubCaption, gidForts, gidLowGravity, gidInvulnerable,

            gidVampiric, gidKarma, gidKing, gidPlaceHog, gidArtillery,

            gidSolidLand, gidSharedAmmo, gidMineTimer, gidNoMineTimer,

            gidRandomMineTimer, gidDamageModifier, gidResetHealth, gidAISurvival,

            gidInfAttack, gidResetWeps, gidPerHogAmmo, gidTagTeam);

    TLandArray = packed array of array of LongWord;

    TCollisionArray = packed array of array of Word;

    TDirtyTag = packed array of array of byte;

    TPreview  = packed array[0..127, 0..31] of byte;

    TPreviewAlpha  = packed array[0..127, 0..255] of byte;

    PWidgetMovement = ^TWidgetMovement;

    TWidgetMovement = record

        animate   : Boolean;

        source    : TPoint;

        target    : TPoint;

        startTime : Longword;

        end;

    POnScreenWidget = ^TOnScreenWidget;

    TOnScreenWidget = record

        show          : boolean;            // if false widget will not be drawn

        sprite        : TSprite;            // a convenience type