Game States

Game States are the top level states of the Zelda 64 engine.

Types of Game States

Ocarina of Time has six normally usable game states:

Core Game States
Code File	Description
n/a	Initial Game State
ovl_title	Displays the Nintendo Logo
ovl_opening	Initializes the Title Screen cutscene
n/a	Main Game
ovl_file_choose	File Select menu
ovl_select	Map Select menu

Game State Table

code (File)
Game State
Version	Offset	VRom		VRam
Debug	`1029D0`	`00B969D0`	`00B96AF0`	`8011F830`	`8011F950`
NTSC 1.0	`0E02A0`	`00B672A0`	`00B673C0`	`800F1340`	`800F1460`
PAL MQ	`0DD290`	`00B65290`	`00B653B0`	`800EE190`	`800EE2B0`

This table defines the top-level states the game can execute in (Map Select, Boot Logo, the playable game itself, etc.), and reserves variable space for each state

Format

/* 0x00 */ uint RamStart; //location of overlay in ram, or 0 in rom
/* 0x04 */ int VRomStart; //if applicable
/* 0x08 */ int VRomEnd;   //if applicable
/* 0x0C */ int VRamStart; //if applicable

/* 0x10 */ int VRamEnd;   //if applicable
/* 0x14 */ uint unknown2;
/* 0x18 */ ptr VRamInitialization; //initializes and executes the given context
/* 0x1C */ ptr VRamDeconstructor; //"deconstructs" the context, and sets the next context to load

/* 0x20-0x2B */ //unknown

/* 0x2C */ int AllocateSize; //Size of initialized instance of the overlay

Debug Rom

VRom Start	VRom End	VRam Start	VRam End	VRam Initialization	VRam Deconstructor	Instance Variables	File	Description
00000000	00000000	00000000	00000000	800C4104	800C40FC	000000A4	N/A
00BCFAC0	00BD2B20	80800B90	80803BF0	80801E44	80801E0C	00000240	ovl_select	Map Select
00BCEF30	00BCFAC0	80800000	80800B90	80800878	80800858	000001E8	ovl_title	Nintendo Logo (on Boot)
00000000	00000000	00000000	00000000	800BCA64	800BC8EC	00012518	game_play	Main Game
00BD2B20	00BD2C70	80803BF0	80803D40	80803CAC	80803CA4	000001D0	ovl_opening	Initializes the game into the title screen
00BD2C70	00BE2730	80803D40	80813820	80811A20	80811A18	0001CAE0	ovl_file_choose	File Select

NTSC 1.0

VRom Start	VRom End	VRam Start	VRam End	VRam Initialization	VRam Deconstructor	Instance Variables	File	Description
00000000	00000000	00000000	00000000	800A0748	800A073C	000000A4	N/A
00B9E400	00BA1160	808009C0	80803720	80801C14	80801C08	00000240	ovl_select	Map Select
00B9DA40	00B9E400	80800000	808009C0	808007B0	80800750	000001E8	ovl_title	Nintendo Logo (on Boot)
00000000	00000000	00000000	00000000	8009A750	8009A5C0	00012518	game_play	Main Game
00BA1160	00BA12C0	80803720	80803880	808037E8	808037DC	000001D0	ovl_opening	Initializes the game into the title screen
00BA12C0	00BB11E0	80803880	808137C0	80812394	80812388	0001CAD0	ovl_file_choose	File Select

PAL MQ

VRom Start	VRom End	VRam Start	VRam End	VRam Initialization	VRam Deconstructor	Instance Variables	File	Description
00000000	00000000	00000000	00000000	800A02D8	800A02CC	000000A4	N/A
00B8AA80	00B8D700	80800850	808034D0	80801A40	80801A34	00000240	ovl_select	Map Select
00B8A230	00B8AA80	80800000	80800850	808006C0	808006A0	000001E8	ovl_title	Nintendo Logo (on Boot)
00000000	00000000	00000000	00000000	8009A4CC	8009A360	00012518	game_play	Main Game
00B8D700	00B8D860	808034D0	80803630	80803598	8080358C	000001D0	ovl_opening	Initializes the game into the title screen
00B8D860	00B9C470	80803630	80812260	80810C54	80810C48	0001CAE0	ovl_file_choose	File Select

prenmi State

The prenmi game state is an otherwise unusable game state that does not appear on the game state overlay table. In the Debug Rom, it is invoked by having a controller plugged into port two during boot-up, then resetting the game at any time. This will force a swap to the prenmi state, but the state will not be invoked due to it not having a record on the on the overlay table; instead the graph thread will silently end execution.

The prenmi game state has a working draw function. It runs at 60 fps, and draws for a few frames before exiting. It draws a horizontal line across the screen that moves upwards vertically, as well as the normal input display in the bottom right corner.

Notes

//Variables
8012DBC0 s32 //set to 1 on boot if a controller is plugged into port 2
//Functions
80092330 //prenmi_move
80092384 //prenmi_draw
800924B0 //prenmi_destructor
800924B8 //prenmi_init

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