sm64coopdx/docs/lua/guides/mario-state.md

How to use gMarioStates

Section 1: What is gMarioStates?

gMarioStates is an array that goes from 0 to the maximum amount of players, or 16, subtracted by 1, 0 being your mario, that contains a MarioState struct. The reason the end of the range is the max players subtracted by 1 instead of just the max players is because arrays are 0 indexed, which means that instead of starting at 1, arrays start at 0, so the total numbers of entries in that array is 16, which is the maximum amount of players.

Section 2: What is the MarioState Structure?

The MarioState structure contains 76 different variables, this guide will try to make it as easy as possible to understand.

Field	Type	Notes
playerIndex	integer	This is the local index of the Mario you are modifying out of all of the 16 different Mario's.
input	integer	Mario's current input. This can be the INPUT_A_BUTTON constant, etc.
flags	integer	Includes things such as the current cap mario has on, and similar properties.
particleFlags	integer	This can be used to add particles to Mario, such as the one you see with the star dance.
action	integer	Mario's current action, this includes ACT_IDLE, ACT_JUMP, etc.
prevAction	integer	Mario's previous action, similar to above.
terrainSoundAddend	integer	Used to see what sound for the terrain is being used.
actionState	integer	Typically used within actions, can be useful for deciding whether or not to return a specific action by reading this variable set within the action.
actionTimer	integer	How long it has been since the action was set.
actionArg	integer	This var is typically set when the action is set, i.e when setting the action to ACT_STAR_DANCE, decide whether or not the animation should be the water star dance animation or not, if yes, set actionArg to 1, else, set actionArg to 0
intendedMag	integer	The intended magnitude. Without smoothening, this is the magnitude
intendedYaw	integer	The intended yaw, similar to above, except the yaw, or y axis.
invincTimer	integer	How long Mario will be invincible, if 0 or less than 0, there will be no invincibility for Mario.
framesSinceA	integer	How long it has been since the controller last hit the A button.
framesSinceB	integer	How long it has been since the controller last hit the B button.
wallKickTimer	integer	When you bonk on a wall, this timer is set to 5, if you press A before the timer comes down to 0, then the walljump action can be set.
doubleJumpTimer	integer	Similar to the wallKickTimer, except for being able to do a double jump.
faceAngle	Vec3s	Which direction mario is looking in every axis.
angleVel	Vec3s	Mario's angle velocity, how slow or fast Mario's angle will change.
slideYaw	integer	Mario's yaw face angle when sliding.
twirlYaw	integer	Mario's yaw face angle when twirling.
pos	Vec3f	Mario's current location.
vel	Vec3f	Mario's velocity, this is different from mario's forwardVel below, and more advanced. This is typically used to adjust Mario's overall speed.
forwardVel	integer	Mario's forward velocity, used in most of Mario's actions.
slideVelX	integer	Mario's x velocity for sliding. Typically use this with slideVelZ for best results.
slideVelZ	integer	Mario's z velocity for sliding. Typically use this with slideVelX for best results.
wall	Surface	The wall mario is currently touching.
ceil	Surface	The ceiling mario is currently touching.
floor	Surface	The floor mario is currently touching.
ceilHeight	integer	The height of mario's current ceiling.
floorHeight	integer	The height of mario's current floor.
floorAngle	integer	The angle of mario's current floor.
waterLevel	integer	The height of mario's current water.
interactObj	Object	The object mario has interacted with.
heldObj	Object	The object mario is holding.
usedObj	Object	The object mario is "using" i.e stomping a goomba, or grabbing the hoot in Whomp's Fortress.
riddenObj	Object	The object mario is riding, for instance, if he is riding a shell, then mario's riddenObj will be set to the shell object.
marioObj	Object	Mario's object, Mario himself is an object, so the MarioState structure contains the Mario object.
spawnInfo	SpawnInfo	Mario's Spawn Info, this is much more advanced, and should not need to be changed.
area	Area	Mario's current area. You can use this var to access the camera, music params, warp nodex, etc.
statusForCamera	PlayerCameraState	This is a bit more complicated, but is generally used to handle cutscenes, and other things such as cannons.
marioBodyState	MarioBodyState	This var contains multiple visual variables, such as Mario's head position, if Mario should look like he has the vanish, metal, or wing cap on, etc.
controller	Controller	This contains the button Mario is pressing, holding, the stick position, etc. Similar to input, except easier to change this variable and see results.
animation	MarioAnimation	Contains Mario's animation data, you usually don't have to touch this, but rather use functions such as set_mario_animation.
collidedObjInteractTypes	integer	If Mario is interacting with an object, then the type will be in this variable, i.e when interacting with a door, this variable will be set to INTERACT_DOOR, assuming it's not INTERACT_WARP_DOOR.
numCoins	integer	How many coins Mario has.
numStars	integer	How many stars Mario has. NOTE: Changing this variable will NOT change the save file, if you need to do that, refer to the function save_file_set_star_flags.
numKeys	integer	[UNUSED] How many keys mario has.
numLives	integer	How many lives mario has.
health	integer	Mario's health in hex value. Full health is 0x880.
unkB0	integer	Something you wont have to modify, seems to be used for animations and such.
hurtCounter	integer	How much health mario should lose.
healCounter	integer	How much health mario should gain.
squishTimer	integer	How long mario should stay squished for. It should be noted that if the squishTimer is less than or equal to 16 that mario's size will rubberband. It should also be noted that if mario's squishTimer is equal to 0, then mario's size will be normal.
fadeWarpOpacity	integer	Mario's opacity when using a fading warp.
capTimer	integer	How much time should the current cap last for.
prevNumStarsForDialog	integer	This var is used to decide if the star dialog should be played or not.
peakHeight	integer	Mario's highest point, or y value. Mainly used for fall damage to see how far Mario has fallen since his peak height.
quicksandDepth	integer	How deep mario is into the quicksand.
unkC4	integer	You probably wont need to modify this variable, seems to be used for ACT_GETTING_BLOWN.
currentRoom	integer	The room mario is in, used for handling the rendering of rooms.
heldByObj	Object	The object mario is being held by, mainly used for King Bob-omb and Chuckya.
isSnoring	integer	Stores if Mario is snoring or not, can be used as a bool.
bubbleObj	Object	The bubble object for Mario, this is almost always the bubble you see when bubbling is enabled in the host settings.
freeze	integer	Stores if Mario is frozen or not, can be used as a bool.
splineKeyframe	Vec4s	Used in the flight path for the grand star.
splineKeyframeFraction	integer	Used in the flight path for the grand star.
splineState	integer	Used in the flight path for the grand star.
nonInstantWarpPos	Vec3f	Mario's non instant warp position, not used in many places, you should not have to change this var.
character	Character	Contains all of Mario's or the current character's sounds, like snoring, dying, being attacked, etc.
wasNetworkVisible	bool	A more advanced variable, this var should not be changed unless you know what your doing.
minimumBoneY	integer	Used for animations.
curAnimOffset	integer	Used to offset an animation.
knockbackTimer	integer	Used for invincibilty when flying through the air after a bonk or being hit by another player.
specialTripleJump	integer	Can be used as a bool, sets whether or not to use the special triple jump unlocked after talking to Yoshi.
wallNormal	Vec3f	The angle of the current wall on the x, y, and z axis.
cap	integer	Where Mario's cap is meant to be. Can be on Mario's head, the snowman's head in Snowman's Land, held by Klepto, or on Ukiki's head.

Section 3: When should I use gMarioStates?

Most of the time you won't be using gMarioStates[0] to access your Mario, but rather use a hook. A lot of hooks pass m through the function. What does this mean? Well, here is a example with comments to explain it as good as possible:

-- m here is gMarioStates with the index being 0...16, one of those, so you are not always modifying your own mario.
function mario_update(m)
	-- Refer to section 2 of this guide to know what playerIndex is

	-- Remember how gMarioStates[0] is the local mario? Well the playerIndex is the same way! This means that if the playerIndex is not 0, then it's not the local mario, thus we can't do anything with it! So, when we return here, that means that we dont do anything below the return within that function

	-- This means, if not the local Mario, stop executing the function (return nothing).
	if m.playerIndex ~= 0 then return end
end

-- Create the hook here, to understand this better, refer to the guide on hooks. NOTE: There are more hooks you can use to do specific things, however HOOK_MARIO_UPDATE is the most common hook to be used.

-- While it isn't mandatory to use "mario_update" as the function name, it is highly recommended and a common practice.
hook_event(HOOK_MARIO_UPDATE, mario_update)

The only time you should use gMarioStates[0] is if the hook you are using does not have m as a parameter, otherwise, do as shown above with your own function names.

Section 4: Wrapping Up

Hopefully, you were able to learn more about how gMarioStates works, if you have any questions, please join the sm64ex-coop discord server, and ask in #coop-mod-discussion.