sm64coopdx/docs/lua/hooks.md

⏪ Lua Reference

Hooks

Hooks are a way for SM64 to trigger Lua code, whereas the functions listed in functions allow Lua to trigger SM64 code.

Hook Event Types

Type	Description	Parameters
HOOK_UPDATE	Called once per frame	None
HOOK_MARIO_UPDATE	Called once per player per frame at the end of a mario update	MarioState
HOOK_BEFORE_MARIO_UPDATE	Called once per player per frame at the beginning of a mario update	MarioState
HOOK_ON_SET_MARIO_ACTION	Called every time a player's current action is changed	MarioState
HOOK_BEFORE_PHYS_STEP	Called once per player per frame before physics code is run	MarioState

hook_event

The lua functions sent to hook_event() will be automatically called by SM64 when certain events occur.

Parameters

Field	Type
hook_event_type	HookEventType
func	Lua Function

Lua Example

The following example will print out a message 16 times per frame (once for every possible player).

function mario_update(m)
    print('Mario update was called for player index ', m.playerIndex)
end

hook_event(HOOK_MARIO_UPDATE, mario_update)

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hook_mario_action

hook_mario_action() allows Lua mods to create new actions or override existing ones.

Parameters

Field	Type
action_id	integer
func	Lua Function

Lua Example

ACT_WALL_SLIDE = (0x0BF | ACT_FLAG_AIR | ACT_FLAG_MOVING | ACT_FLAG_ALLOW_VERTICAL_WIND_ACTION)

function act_wall_slide(m)
    if (m.input & INPUT_A_PRESSED) ~= 0 then
        local rc = set_mario_action(m, ACT_TRIPLE_JUMP, 0)
        m.vel.y = 72.0

        if m.forwardVel < 20.0 then
            m.forwardVel = 20.0
        end
        m.wallKickTimer = 0
        return rc
    end

    -- attempt to stick to the wall a bit. if it's 0, sometimes you'll get kicked off of slightly sloped walls
    mario_set_forward_vel(m, -1.0)

    m.particleFlags = m.particleFlags | PARTICLE_DUST

    play_sound(SOUND_MOVING_TERRAIN_SLIDE + m.terrainSoundAddend, m.marioObj.header.gfx.cameraToObject)
    set_mario_animation(m, MARIO_ANIM_START_WALLKICK)

    if perform_air_step(m, 0) == AIR_STEP_LANDED then
        mario_set_forward_vel(m, 0.0)
        if check_fall_damage_or_get_stuck(m, ACT_HARD_BACKWARD_GROUND_KB) == 0 then
            return set_mario_action(m, ACT_FREEFALL_LAND, 0)
        end
    end

    m.actionTimer = m.actionTimer + 1
    if m.wall == nil and m.actionTimer > 2 then
        mario_set_forward_vel(m, 0.0)
        return set_mario_action(m, ACT_FREEFALL, 0)
    end

    -- gravity
    m.vel.y = m.vel.y + 2

    return 0
end

function mario_on_set_action(m)
    -- wall slide
    if m.action == ACT_SOFT_BONK then
        m.faceAngle.y = m.faceAngle.y + 0x8000
        set_mario_action(m, ACT_WALL_SLIDE, 0)
    end
end

hook_event(HOOK_ON_SET_MARIO_ACTION, mario_on_set_action)
hook_mario_action(ACT_WALL_SLIDE, act_wall_slide)

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