sm64ex-coop/docs/lua/guides/hooks.md

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## [:rewind: Lua Reference](../lua.md)
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# Hooks
Hooks are a way for SM64 to trigger Lua code, whereas the functions listed in [functions](functions.md) allow Lua to trigger SM64 code.
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# Supported Hooks
- [hook_behavior](#hook_behavior)
- [hook_chat_command](#hook_chat_command)
- [hook_event](#hook_event)
- [hook_mario_action](#hook_mario_action)
- [hook_on_sync_table_change](#hook_on_sync_table_change)
<br />
## [hook_behavior](#hook_behavior)
`hook_behavior()` allows Lua mods to override existing behaviors or create new ones.
### Parameters
| Field | Type | Notes |
| ----- | ---- | ----- |
| behaviorId | [enum BehaviorId](constants.md#enum-BehaviorId) | Set to `nil` to create a new behavior |
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| objectList | [enum ObjectList](constants.md#enum-ObjectList) | |
| replaceBehavior | `bool` | Prevents the original behavior code from running |
| initFunction | `Lua Function` ([Object](structs.md#Object) obj) | Runs once per object |
| loopFunction | `Lua Function` ([Object](structs.md#Object) obj) | Runs once per frame per object |
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### Returns
- [enum BehaviorId](constants.md#enum-BehaviorId)
### Lua Example
```lua
function bhv_example_init(obj)
obj.oFlags = OBJ_FLAG_UPDATE_GFX_POS_AND_ANGLE
network_init_object(obj, true, nil)
end
function bhv_example_loop(obj)
obj.oPosY = obj.oPosY + 1
end
id_bhvExample = hook_behavior(0, OBJ_LIST_DEFAULT, bhv_example_init, bhv_example_loop)
```
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<br />
## [hook_chat_command](#hook_chat_command)
`hook_chat_command()` allows Lua mods to react and respond to chat commands. Chat commands start with the `/` character. The function the mod passes to the hook should return `true` when the command was valid and `false` otherwise.
### Parameters
| Field | Type |
| ----- | ---- |
| command | `string` |
| description | `string` |
| func | `Lua Function` (`string` message) -> `bool` |
### Lua Example
```lua
function on_test_command(msg)
if msg == 'on' then
djui_chat_message_create('Test: enabled')
return true
elseif msg == 'off' then
djui_chat_message_create('Test: disabled')
return true
end
return false
end
hook_chat_command('test', "[on|off] turn test on or off", on_hide_and_seek_command)
```
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<br />
## [hook_event](#hook_event)
The lua functions sent to `hook_event()` will be automatically called by SM64 when certain events occur.
### [Hook Event Types](#Hook-Event-Types)
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| 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](structs.md#MarioState) mario |
| HOOK_BEFORE_MARIO_UPDATE | Called once per player per frame at the beginning of a mario update | [MarioState](structs.md#MarioState) mario |
| HOOK_ON_SET_MARIO_ACTION | Called every time a player's current action is changed | [MarioState](structs.md#MarioState) mario |
| HOOK_BEFORE_PHYS_STEP | Called once per player per frame before physics code is run | [MarioState](structs.md#MarioState) mario |
| HOOK_ALLOW_PVP_ATTACK | Called when one player attacks another, return `true` to allow the attack | [MarioState](structs.md#MarioState) attacker, [MarioState](structs.md#MarioState) victim |
| HOOK_ON_PVP_ATTACK | Called when one player attacks another | [MarioState](structs.md#MarioState) attacker, [MarioState](structs.md#MarioState) victim |
| HOOK_ON_PLAYER_CONNECTED | Called when a player connects | [MarioState](structs.md#MarioState) connector |
| HOOK_ON_PLAYER_DISCONNECTED | Called when a player disconnects | [MarioState](structs.md#MarioState) disconnector |
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| HOOK_ON_HUD_RENDER | Called when the HUD is being rendered | None |
| HOOK_ALLOW_INTERACT | Called before mario interacts with an object, return `true` to allow the interaction | [MarioState](structs.md#MarioState) interactor, [Object](structs.md#Object) interactee, [enum InteractionType](constants.md#enum-InteractionType) interactType |
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| HOOK_ON_INTERACT | Called when mario interacts with an object | [MarioState](structs.md#MarioState) interactor, [Object](structs.md#Object) interactee, [enum InteractionType](constants.md#enum-InteractionType) interactType, bool interactValue |
| HOOK_ON_LEVEL_INIT | Called when the level is initialized | None |
| HOOK_ON_WARP | Called when the local player warps | None |
| HOOK_ON_SYNC_VALID | Called when the current area is synchronized | None |
| HOOK_ON_OBJECT_UNLOAD | Called when any object is unloaded | [Object](structs.md#Object) unloadedObject |
| HOOK_ON_SYNC_OBJECT_UNLOAD | Called when any networked object is unloaded | [Object](structs.md#Object) unloadedObject |
| HOOK_ON_PAUSE_EXIT | Called when the local player exits through the pause screen, return `false` to prevent the exit | `boolean` usedExitToCastle |
| HOOK_GET_STAR_COLLECTION_DIALOG | Called when the local player collects a star, return a [DialogId](constants.md#enum-DialogId) to show a message | None |
| HOOK_ON_SET_CAMERA_MODE | Called when the camera mode gets set, return `false` to prevent the camera mode from being set | [Camera](structs.md#Camera), `integer` mode, `integer` frames |
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| HOOK_ON_OBJECT_RENDER | Called right before an object is rendered. **Note:** You must set the `hookRender` field of the object to a non-zero value | [Object](structs.md#Object) renderedObj |
| HOOK_ON_DEATH | Called when the local player dies, return `false` to prevent normal death sequence | [MarioState](structs.md#MarioState) localMario |
| HOOK_ON_PACKET_RECEIVE | Called when the mod receives a packet that used `network_send()` or `network_send_to()` | `table` dataTable |
| HOOK_USE_ACT_SELECT | Called when the level changes, return `true` to show act selection screen and `false` otherwise | `integer` levelNum |
| HOOK_ON_CHANGE_CAMERA_ANGLE | Called when the player changes the camera mode to Lakitu cam or Mario cam, return `false` to prevent the change. | `integer` mode |
| HOOK_ON_SCREEN_TRANSITION | Called when the game is about to play a transition, return `false` to prevent the transition from playing. | `integer` type |
| HOOK_ALLOW_HAZARD_SURFACE | Called once per frame. Return `false` to prevent Mario from being affected by lava or quicksand. | [MarioState](structs.md#MarioState) localMario |
| HOOK_ON_CHAT_MESSAGE | Called when a chat message gets sent. Return `false` to prevent the message from being sent. | [MarioState](structs.md#MarioState) messageSender |
| HOOK_OBJECT_SET_MODEL | Called when a behavior changes models. Also runs when a behavior spawns. | [Object](structs.md#Object) obj, `integer` modelID |
| HOOK_CHARACTER_SOUND | Called when mario retrieves a character sound to play, return a character sound or `0` to override it. | [MarioState](structs.md#MarioState) mario, [enum CharacterSound](constants.md#enum-CharacterSound) characterSound |
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### Parameters
| Field | Type |
| ----- | ---- |
| hook_event_type | [HookEventType](#Hook-Event-Types) |
| func | `Lua Function` (`...`) |
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### Lua Example
The following example will print out a message 16 times per frame (once for every possible player).
```lua
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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<br />
## [hook_mario_action](#hook_mario_action)
`hook_mario_action()` allows Lua mods to create new actions or override existing ones.
### Parameters
| Field | Type |
| ----- | ---- |
| action_id | `integer` |
Fix issues Extended Moveset mod (+ extras) (#146) * Allow Lua action hooks to specify custom functions for more behavior ...like gravity, and update all current mods to match. Spin jump and wall slide from the Extended Moveset mod now have gravity code basically matching the original mod. Currently, any place you'd want to use one of these new action hooks still requires an O(n) check through all action hook per call. This should probably be changed. * Fix some remaining issues with Extended Moveset Lua port - Remove divergent spin jump code - Remove divergent roll code - Remap roll button to Y - Reimplement dive slide to make dive hop work like the original - Allow spin from double jump, backflip, side flip * Fix more issues with Extended Moveset Lua port - Reimplement all users of update_walking_speed to incorporate the Tight Controls edits and modified speed caps - Fix instances of angle arithmetic to wrap properly across the mod * Don't chop off group bits of custom action flags; assign missing groups in mods This fixes the Extended Moveset's underwater actions. Chopping off those bits was making the game consider the underwater actions to be a part of the Stationary group, which caused `check_common_stationary_cancels`, which upwarps Mario to the surface. * Tweak roll sliding angle tendency Rolling will now gradually (but fairly quckly) try to tend Mario's facing angle down the slope. This is cleaner than my old method that tries to flip Mario's angle (wrongly) when he begins moving downward, having that logic coexist with the logic for normal sliding actions that can also tend Mario to face backward down the slope. Just looks ugly now by comparison. * Disallow spin jump on slides in Extended Moveset port This matches the original mod * Extended Moveset: Crazy Box Bounce check * Extended Moveset: Fix hugging the wall when spin jumping after wall kick * Extended Moveset: Fix ledge drop snapping up to ground Just reimplement `act_air_hit_wall` ourselves. * Extended Moveset: Add Kaze's walking speed fix * smlua_hooks.c: Restore option to use old API for hook_mario_action The intent is to allow mods outside of this repo to continue working. Co-authored-by: djoslin0 <djoslin0@users.noreply.github.com>
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| func | Table with entries for [Action Hook Types](#action-hook-types) of `Lua Function` ([MarioState](structs.md#MarioState) m) |
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| interaction_type | [enum InteractionFlag](constants.md#enum-InteractionFlag) <optional> |
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Fix issues Extended Moveset mod (+ extras) (#146) * Allow Lua action hooks to specify custom functions for more behavior ...like gravity, and update all current mods to match. Spin jump and wall slide from the Extended Moveset mod now have gravity code basically matching the original mod. Currently, any place you'd want to use one of these new action hooks still requires an O(n) check through all action hook per call. This should probably be changed. * Fix some remaining issues with Extended Moveset Lua port - Remove divergent spin jump code - Remove divergent roll code - Remap roll button to Y - Reimplement dive slide to make dive hop work like the original - Allow spin from double jump, backflip, side flip * Fix more issues with Extended Moveset Lua port - Reimplement all users of update_walking_speed to incorporate the Tight Controls edits and modified speed caps - Fix instances of angle arithmetic to wrap properly across the mod * Don't chop off group bits of custom action flags; assign missing groups in mods This fixes the Extended Moveset's underwater actions. Chopping off those bits was making the game consider the underwater actions to be a part of the Stationary group, which caused `check_common_stationary_cancels`, which upwarps Mario to the surface. * Tweak roll sliding angle tendency Rolling will now gradually (but fairly quckly) try to tend Mario's facing angle down the slope. This is cleaner than my old method that tries to flip Mario's angle (wrongly) when he begins moving downward, having that logic coexist with the logic for normal sliding actions that can also tend Mario to face backward down the slope. Just looks ugly now by comparison. * Disallow spin jump on slides in Extended Moveset port This matches the original mod * Extended Moveset: Crazy Box Bounce check * Extended Moveset: Fix hugging the wall when spin jumping after wall kick * Extended Moveset: Fix ledge drop snapping up to ground Just reimplement `act_air_hit_wall` ourselves. * Extended Moveset: Add Kaze's walking speed fix * smlua_hooks.c: Restore option to use old API for hook_mario_action The intent is to allow mods outside of this repo to continue working. Co-authored-by: djoslin0 <djoslin0@users.noreply.github.com>
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#### [Action Hook Types](#action-hook-types)
| Type | Description | Returns |
| :--- | :---------- | :------ |
| every_frame | Main action code, called once per frame | `true` if action cancelled, else `false` |
| gravity | Called inside `apply_gravity` when in action | Unused |
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### Lua Example
```lua
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
return 0
end
Fix issues Extended Moveset mod (+ extras) (#146) * Allow Lua action hooks to specify custom functions for more behavior ...like gravity, and update all current mods to match. Spin jump and wall slide from the Extended Moveset mod now have gravity code basically matching the original mod. Currently, any place you'd want to use one of these new action hooks still requires an O(n) check through all action hook per call. This should probably be changed. * Fix some remaining issues with Extended Moveset Lua port - Remove divergent spin jump code - Remove divergent roll code - Remap roll button to Y - Reimplement dive slide to make dive hop work like the original - Allow spin from double jump, backflip, side flip * Fix more issues with Extended Moveset Lua port - Reimplement all users of update_walking_speed to incorporate the Tight Controls edits and modified speed caps - Fix instances of angle arithmetic to wrap properly across the mod * Don't chop off group bits of custom action flags; assign missing groups in mods This fixes the Extended Moveset's underwater actions. Chopping off those bits was making the game consider the underwater actions to be a part of the Stationary group, which caused `check_common_stationary_cancels`, which upwarps Mario to the surface. * Tweak roll sliding angle tendency Rolling will now gradually (but fairly quckly) try to tend Mario's facing angle down the slope. This is cleaner than my old method that tries to flip Mario's angle (wrongly) when he begins moving downward, having that logic coexist with the logic for normal sliding actions that can also tend Mario to face backward down the slope. Just looks ugly now by comparison. * Disallow spin jump on slides in Extended Moveset port This matches the original mod * Extended Moveset: Crazy Box Bounce check * Extended Moveset: Fix hugging the wall when spin jumping after wall kick * Extended Moveset: Fix ledge drop snapping up to ground Just reimplement `act_air_hit_wall` ourselves. * Extended Moveset: Add Kaze's walking speed fix * smlua_hooks.c: Restore option to use old API for hook_mario_action The intent is to allow mods outside of this repo to continue working. Co-authored-by: djoslin0 <djoslin0@users.noreply.github.com>
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function act_wall_slide_gravity(m)
m.vel.y = m.vel.y - 2
if m.vel.y < -15 then
m.vel.y = -15
end
end
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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)
Fix issues Extended Moveset mod (+ extras) (#146) * Allow Lua action hooks to specify custom functions for more behavior ...like gravity, and update all current mods to match. Spin jump and wall slide from the Extended Moveset mod now have gravity code basically matching the original mod. Currently, any place you'd want to use one of these new action hooks still requires an O(n) check through all action hook per call. This should probably be changed. * Fix some remaining issues with Extended Moveset Lua port - Remove divergent spin jump code - Remove divergent roll code - Remap roll button to Y - Reimplement dive slide to make dive hop work like the original - Allow spin from double jump, backflip, side flip * Fix more issues with Extended Moveset Lua port - Reimplement all users of update_walking_speed to incorporate the Tight Controls edits and modified speed caps - Fix instances of angle arithmetic to wrap properly across the mod * Don't chop off group bits of custom action flags; assign missing groups in mods This fixes the Extended Moveset's underwater actions. Chopping off those bits was making the game consider the underwater actions to be a part of the Stationary group, which caused `check_common_stationary_cancels`, which upwarps Mario to the surface. * Tweak roll sliding angle tendency Rolling will now gradually (but fairly quckly) try to tend Mario's facing angle down the slope. This is cleaner than my old method that tries to flip Mario's angle (wrongly) when he begins moving downward, having that logic coexist with the logic for normal sliding actions that can also tend Mario to face backward down the slope. Just looks ugly now by comparison. * Disallow spin jump on slides in Extended Moveset port This matches the original mod * Extended Moveset: Crazy Box Bounce check * Extended Moveset: Fix hugging the wall when spin jumping after wall kick * Extended Moveset: Fix ledge drop snapping up to ground Just reimplement `act_air_hit_wall` ourselves. * Extended Moveset: Add Kaze's walking speed fix * smlua_hooks.c: Restore option to use old API for hook_mario_action The intent is to allow mods outside of this repo to continue working. Co-authored-by: djoslin0 <djoslin0@users.noreply.github.com>
2022-08-08 00:25:00 +02:00
hook_mario_action(ACT_WALL_SLIDE, { every_frame = act_wall_slide, gravity = act_wall_slide_gravity } )
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```
[:arrow_up_small:](#)
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<br />
## [hook_on_sync_table_change](#hook_on_sync_table_change)
`hook_on_sync_table_change()` allows Lua mods to react to sync table changes.
- `syncTable` parameter must be a sync table, e.g. [gGlobalSyncTable](globals.md#gGlobalSyncTable), [gPlayerSyncTable[]](globals.md#gPlayerSyncTable), or one of their child tables.
- `field` parameter must be one of the fields in the `SyncTable`.
- `tag` parameter can be any type, and is automatically passed to the callback.
- `func` parameter must be a function with three parameters: `tag`, `oldVal`, and `newVal`.
- `tag` will be the same `tag` passed into `hook_on_sync_table_change()`.
- `oldVal` will be the value before it was set.
- `newVal` will be the value that it was set to.
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### Parameters
| Field | Type |
| ----- | ---- |
| syncTable | `SyncTable` |
| field | `value` |
| tag | `value` |
| func | `Lua Function` (`value` tag, `value` oldValue, `value` newValue) |
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### Lua Example
```lua
function on_testing_field_changed(tag, oldVal, newVal)
print('testingField changed:', tag, ',', oldVal, '->', newVal)
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end
hook_on_sync_table_change(gGlobalSyncTable, 'testingField', 'tag', on_testing_field_changed)
-- now when testingField is set, either locally or over the network, on_testing_field_changed() will be called
gGlobalSyncTable.testingField = 'hello'
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```
[:arrow_up_small:](#)