crown-engine/docs/lua_api.txt

.. contents::

Math
====

Vector3
-------

Constructors
~~~~~~~~~~~~

	**Vector3** (x, y, z) : Vector3
		Returns a new vector from individual elements.

Functions
~~~~~~~~~

	**x** (v) : float
		Returns the x value of the vector.

	**y** (v) : float
		Returns the y value of the vector.

	**z** (v) : float
		Returns the z value of the vector.

	**.x** : float
		Returns/assigns the x value of the vector.

	**.y** : float
		Returns/assigns the y value of the vector.

	**.z** : float
		Returns/assigns the z value of the vector.

	**set_x** (v, x)
		Sets the value of the x value of the vector.

	**set_y** (v, y)
		Sets the value of the y value of the vector.

	**set_z** (v, z)
		Sets the value of the z value of the vector.

	**elements** (v) : float, float, float
		Returns the x, y and z elements of the vector.

	**add** (a, b) : Vector3
		Adds the vector *a* to *b* and returns the result.

	**subtract** (a, b) : Vector3
		Subtracts the vector *b* from *a* and returns the result.

	**multiply** (a, k) : Vector3
		Multiplies the vector *a* by the scalar *k* and returns the result.

	**dot** (a, b) : float
		Returns the dot product between the vectors *a* and *b*.

	**cross** (a, b) : Vector3
		Returns the cross product between the vectors *a* and *b*.

	**equal** (a, b) : bool
		Returns true whether the vectors *a* and *b* are equal.

	**length** (a) : float
		Returns the lenght of *a*.

	**length_squared** (a) : float
		Returns the squared length of *a*.

	**set_length** (a, len)
		Sets the lenght of *a* to *len*.

	**normalize** (a) : Vector3
		Normalizes *a* and returns the result.

	**distance** (a, b) : float
		Returns the distance between the points *a* and *b*.

	**distance_squared** (a, b) : float
		Returns the squared distance between the points *a* and *b*.

	**angle** (a, b) : float
		Returns the angle between the vectors *a* and *b*.

	**max** (a, b) : Vector3
		Returns a vector that contains the largest value for each element from *a* and *b*.

	**min** (a, b) : Vector3
		Returns a vector that contains the smallest value for each element from *a* and *b*.

	**lerp** (a, b, t) : Vector3
		Returns the linearly interpolated vector between *a* and *b* at time *t* in [0, 1].

	| **forward** () : Vector3
	| **backward** () : Vector3
	| **left** () : Vector3
	| **right** () : Vector3
	| **up** () : Vector3
	| **down** () : Vector3
	| 	Returns the corresponding semantic axis.

	**zero** () : Vector3
		Returns a vector with all values set to zero.

	**to_string** (v) : string
		Returns a string representing the vector *v*.

Vector3Box
----------

Constructors
~~~~~~~~~~~~

	**Vector3Box** () : Vector3Box
		Returns a new Vector3Box initialized with the zero vector.

	**Vector3Box** (v) : Vector3Box
		Returns a new Vector3Box from the Vector3 *v*.

	**Vector3Box** (x, y, z) : Vector3Box
		Returns a new Vector3Box from individual elements.

Functions
~~~~~~~~~

	**store** (v)
		Stores the Vector3 *v* in the box.

	**store** (x, y, z)
		Stores Vector3(x, y, z) in the box.

	**unbox** () : Vector3
		Returns the stored vector from the box.

Quaternion
----------

Constructors
~~~~~~~~~~~~

	**Quaternion** (axis, angle) : Quaternion
		Returns a new quaternion from *axis* and *angle*.

	**from_elements** (x, y, z, w) : Quaternion
		Returns a new quaternion from individual elements.

	**from_axis_angle** (axis, angle) : Quaternion
		Returns a new quaternion from *axis* and *angle*.

Functions
~~~~~~~~~

	**negate** (q) : Quaternion
		Negates the quaternion *q* and returns the result.

	**identity** () : Quaternion
		Returns the identity quaternion.

	**multiply** (a, b) : Quaternion
		Multiplies the quaternions *a* and *b*. (i.e. rotates first by *a* then by *b*).

	**multiply_by_scalar** (a, k) : Quaternion
		Multiplies the quaternion *a* by the scalar *k*.

	**dot** (a, b) : float
		Returns the dot product between quaternions *a* and *b*.

	**length** (q) : float
		Returns the length of *q*.

	**normalize** (q) : Quaternion
		Normalizes the quaternion *q* and returns the result.

	**conjugate** (q) : Quaternion
		Returns the conjugate of quaternion *q*.

	**inverse** (q) : Quaternion
		Returns the inverse of quaternion *q*.

	**power** (q, exp) : Quaternion
		Returns the quaternion *q* raised to the power of *exp*.

	**elements** (q) : float, float, float, float
		Returns the x, y, z and w elements of the quaternion.

	**look** (dir, [up]) : Quaternion
		Returns the quaternion describing the rotation needed to face towards *dir*.
		If *up* is not specified, Vector3.up() is used.

	**right** (q) : Vector3
		Returns the right axis of the rotation described by *q*.

	**up** (q) : Vector3
		Returns the up axis of the rotation described by *q*.

	**forward** (q) : Vector3
		Returns the forward axis of the rotation described by *q*.

	**lerp** (a, b, t) : Quaternion
		Returns the linearly interpolated quaternion between *a* and *b* at time *t* in [0, 1].
		It uses NLerp.

	**to_string** (q) : string
		Returns a string representing the quaternion *q*.

QuaternionBox
-------------

Constructors
~~~~~~~~~~~~

	**QuaternionBox** () : QuaternionBox
		Returns a new QuaternionBox initialized with the identity quaternion.

	**QuaternionBox** (q) : QuaternionBox
		Returns a new QuaternionBox from the Quaternion *q*.

	**QuaternionBox** (x, y, z, w) : QuaternionBox
		Returns a new QuaternionBox from individual elements.

Functions
~~~~~~~~~

	**store** (q)
		Stores the Quaternion *q* in the box.

	**store** (x, y, z, w)
		Stores Quaternion(x, y, z, w) in the box.

	**unbox** () : Quaternion
		Returns the stored quaternion from the box.

Matrix4x4
---------

Constructors
~~~~~~~~~~~~

	**Matrix4x4** (xx, xy, xz, xw, yx, yy, yz, yw, zx, zy, zz, zw, tx, ty, tz, tw) : Matrix4x4
		Returns a new matrix from individual elements.

	**from_quaternion** (q) : Matrix4x4
		Returns a new matrix from *q*.

	**from_translation** (t) : Matrix4x4
		Returns a new matrix from *t*.

	**from_quaternion_translation** (q, t) : Matrix4x4
		Returns a new matrix from *q* and *t*.

	**from_axes** (x, y, z, t) : Matrix4x4
		Returns a new matrix from *x*, *y*, *z* and *t*.

Functions
~~~~~~~~~

	**copy** (m) : Matrix4x4
		Returns a copy of the matrix *m*.

	**add** (a, b) : Matrix4x4
		Adds the matrix *a* to *b* and returns the result.

	**subtract** (a, b) : Matrix4x4
		Subtracts the matrix *b* from *a* and returns the result.

	**multiply** (a, b) : Matrix4x4
		Multiplies the matrix *a* by *b* and returns the result. (i.e. transforms first by *a* then by *b*)

	**transpose** (m) : Matrix4x4
		Transposes the matrix *m* and returns the result.

	**determinant** (m) : float
		Returns the determinant of the matrix *m*.

	**invert** (m) : Matrix4x4
		Inverts the matrix *m* and returns the result.

	**x** (m) : Vector3
		Returns the x axis of the matrix *m*.

	**y** (m) : Vector3
		Returns the y axis of the matrix *m*.

	**z** (m) : Vector3
		Returns the z axis of the matrix *m*.

	**set_x** (m, x)
		Sets the x axis of the matrix *m*.

	**set_y** (m, y)
		Sets the y axis of the matrix *m*.

	**set_z** (m, z)
		Sets the z axis of the matrix *m*.

	**rotation** (m) : Quaternion
		Returns the rotation portion of the matrix *m*.

	**set_rotation** (m, r)
		Sets the rotation portion of the matrix *m*.

	**translation** (m, a) : Vector3
		Returns the translation portion of the matrix *m*.

	**set_translation** (m, t)
		Sets the translation portion of the matrix *m*.

	**identity** ()
		Returns the identity matrix.

	**transform** (m, v) : Vector3
		Transforms the vector *v* by the matrix *m* and returns the result.

	**to_string** (m) : string
		Returns a string representing the matrix *m*.

Matrix4x4Box
------------

Constructors
~~~~~~~~~~~~

	**Matrix4x4Box** () : Matrix4x4Box
		Returns a new Matrix4x4Box initialized with the identity matrix.

	**Matrix4x4Box** (m) : Matrix4x4Box
		Returns a new Matrix4x4Box from the Matrix4x4 *m*.

Functions
~~~~~~~~~

	**store** (m)
		Stores the Matrix4x4 *m* in the box.

	**unbox** () : Matrix4x4
		Returns the stored matrix from the box.

Color4
------

Constructors
~~~~~~~~~~~~

	**Color4** (r, g, b, a) : Color4
		Returns a new Color4 from individual elements.

Functions
~~~~~~~~~

	**lerp** (a, b, t) : Color4
		Returns the linearly interpolated color between *a* and *b* at time *t* in [0, 1].

	| **black** () : Color4
	| **white** () : Color4
	| **red** () : Color4
	| **green** () : Color4
	| **blue** () : Color4
	| **yellow** () : Color4
	| **orange** () : Color4
	|	Returns the corresponding mnemonic color.

	**to_string** (c) : string
		Returns a string representing the color *c*.

Math
----

	**ray_plane_intersection** (from, dir, point, normal) : float
		Returns the distance along ray (from, dir) to intersection point with plane defined by
		*point* and *normal* or -1.0 if no intersection.

	**ray_disc_intersection** (from, dir, center, radius, normal) : float
		Returns the distance along ray (from, dir) to intersection point with disc defined by
		*center*, *radius* and *normal* or -1.0 if no intersection.

	**ray_sphere_intersection** (from, dir, center, radius) : float
		Returns the distance along ray (from, dir) to intersection point with sphere defined by
		*center* and *radius* or -1.0 if no intersection.

	**ray_obb_intersection** (from, dir, tm, half_extents) : float
		Returns the distance along ray (from, dir) to intersection point with the oriented
		bounding box (tm, half_extents) or -1.0 if no intersection.

	**ray_triangle_intersection** (from, dir, v0, v1, v2) : float
		Returns the distance along ray (from, dir) to intersection point with the triangle
		(v0, v1, v2) or -1.0 if no intersection.

UnitManager
===========

	**create** ([world]) : UnitId
		Creates a new empty unit. If *world* is specified, the unit will be owned by
		that world.

	**destroy** (unit)
		Destroys the given *unit*.

	**alive** (unit) : bool
		Returns whether the unit is alive.

World
=====

	**spawn_unit** (world, name, [position, rotation]) : UnitId
		Spawns a new instance of the unit *name* at the given *position* and *rotation*.

	**spawn_empty_unit** (world) : UnitId
		Spawns a new empty unit and returns its id.

	**destroy_unit** (world, unit)
		Destroys the given *unit*.

	**num_units** (world) : int
		Returns the number of units in the *world*.

	**units** (world) : table
		Returns all the the units in the world in a table.

	**update_animations** (world, dt)
		Update all animations with *dt*.

	**update_scene** (world, dt)
		Updates the scene with *dt*.

	**update** (world, dt)
		Updates the world with *dt*.

	**create_debug_line** (world, depth_test) : DebugLine
		Creates a new DebugLine. *depth_test* controls whether to
		enable depth test when rendering the lines.

	**destroy_debug_line** (world, line)
		Destroys the debug *line*.

	**scene_graph** (world) : SceneGraph
		Returns the scene graph.

	**render_world** (world) : RenderWorld
		Returns the render sub-world.

	**physics_world** (world) : PhysicsWorld
		Returns the physics sub-world.

	**sound_world** (world) : SoundWorld
		Returns the sound sub-world.

Camera
------

	**camera** (world, unit) : Id
		Returns the camera owned by unit *id*.

	**camera_set_projection_type** (world, camera, projection)
		Sets the projection type of the camera.
		Projection can be either ``orthographic`` or ``perspective``.

	**camera_projection_type** (world, camera) : string
		Returns the projection type of the camera.
		It can be either ``orthographic`` or ``perspective``.

	**camera_fov** (world, camera) : float
		Returns the field-of-view of the camera in degrees.

	**camera_set_fov** (world, camera, fov)
		Sets the field-of-view of the camera in degrees.

	**camera_near_clip_distance** (world, camera) : float
		Returns the near clip distance of the camera.

	**camera_set_near_clip_distance** (world, camera, near)
		Sets the near clip distance of the camera.

	**camera_far_clip_distance** (world, camera) : float
		Returns the far clip distance of the camera.

	**camera_set_far_clip_distance** (world, camera, far)
		Sets the far clip distance of the camera.

	**camera_set_orthographic_metrics** (world, camera, left, right, bottom, top)
		Sets the coordinates for orthographic clipping planes. (Orthographic projection only.)

	**camera_screen_to_world** (world, camera, pos) : Vector3
		Returns *pos* from screen-space to world-space coordinates.

	**camera_world_to_screen** (world, camera, pos) : Vector3
		Returns *pos* from world-space to screen-space coordinates.

Sound
-----

	**play_sound** (world, name, [loop, volume, position, range]) : SoundInstanceId
		Plays the sound with the given *name* at the given *position*, with the given
		*volume* and *range*. *loop* controls whether the sound must loop or not.

	**stop_sound** (world, id)
		Stops the sound with the given *id*.

	**link_sound** (world, id, unit, node)
		Links the sound *id* to the *node* of the given *unit*.
		After this call, the sound *id* will follow the unit *unit*.

	**set_listener_pose** (world, pose)
		Sets the *pose* of the listener.

	**set_sound_position** (world, id, position)
		Sets the *position* of the sound *id*.

	**set_sound_range** (world, id, range)
		Sets the *range* of the sound *id*.

	**set_sound_volume** (world, id, volume)
		Sets the *volume* of the sound *id*.

Level
-----

	**load_level** (world, name, [pos, rot]) : Level
		Loads the level *name* into the world at the given *position* and *rotation*.

SceneGraph
==========

	**create** (sg, unit, position, rotation, scale) : Id
		Creates the transform for the *unit*.

	**destroy** (sg, id)
		Destroys the transform *id*.

	**transform_instances** (sg, unit) : Id
		Returns the transform of the *unit* or nil.

	**local_position** (sg, id) : Vector3
		Returns the local position of the transform *id*.

	**local_rotation** (sg, id) : Quaternion
		Returns the local rotation of the transform *id*.

	**local_scale** (sg, id) : Vector3
		Returns the local scale of the transform *id*.

	**local_pose** (sg, id) : Matrix4x4
		Returns the local pose of the transform *id*.

	**world_position** (sg, id) : Vector3
		Returns the world position of the transform *id*.

	**world_rotation** (sg, id) : Quaternion
		Returns the world rotation of the transform *id*.

	**world_pose** (sg, id) : Matrix4x4
		Returns the world pose of the transform *id*.

	**set_local_position** (sg, id, position)
		Sets the local *position* of the transform *id*.

	**set_local_rotation** (sg, id, rotation)
		Sets the local *rotation* of the transform *id*.

	**set_local_scale** (sg, id, scale)
		Sets the local *scale* of the transform *id*.

	**set_local_pose** (sg, id, pose)
		Sets the local *pose* of the transform *id*.

	**link** (sg, child, parent)
		Links *child* transform to *parent* transform.

	**unlink** (sg, id)
		Unlinks *id* transform from its parent, if any.

Material
========

	**set_float** (material, name, value)
		Sets the *value* of the variable *name*.

	**set_vector2** (material, name, value)
		Sets the *value* of the variable *name*.

	**set_vector3** (material, name, value)
		Sets the *value* of the variable *name*.

RenderWorld
===========

	**enable_debug_drawing** (rw, enable)
		Sets whether to *enable* debug drawing.

Mesh
----

	**mesh_create** (rw, unit, mesh_resource, geometry_name, material_resource, visible, pose) : Id
		Creates a new mesh instance for *unit* and returns its id.

	**mesh_destroy** (rw, id)
		Destroys the mesh *id*.

	**mesh_instances** (rw, unit) : table
		Returns all the mesh instances of the *unit*.

	**mesh_raycast** (rw, id, from, dir) : float
		Returns the distance along ray (from, dir) to intersection point with the mesh *id* or -1.0 if no intersection.

Sprite
------

	**sprite_create** (rw, unit, sprite_resource, material_resource, visible, pose) : Id
		Creates a new sprite instance for *unit* and returns its id.

	**sprite_destroy** (rw, id)
		Destroys the sprite *id*.

	**sprite_instances** (rw, unit) : table
		Returns all the sprites of the *unit*.

Light
-----

	**light_create** (rw, unit, type, range, intensity, spot_angle, color, pose) : Id
		Creates a new light for *unit* and returns its id.
		Type can be either ``directional``, ``omni`` or ``spot``.

	**light_destroy** (rw, id)
		Destroys the light *id*.

	**light_instances** (rw, unit) : Id
		Returns the light of the *unit*.

	**light_type** (rw, id) : string
		Returns the type of the light *id*.
		It can be either ``directional``, ``omni`` or ``spot``.

	**light_color** (rw, id) : Color4
		Returns the color of the light *id*.

	**light_range** (rw, id) : float
		Returns the range of the light *id*.

	**light_intensity** (rw, id) : float
		Returns the intensity of the light *id*.

	**light_spot_angle** (rw, id) : float
		Returns the spot angle of the light *id*.

	**light_set_type** (rw, id, type)
		Sets the *type* of the light *id*.

	**light_set_color** (rw, id, color)
		Sets the *color* of the light *id*.

	**light_set_range** (rw, id, range)
		Sets the *range* of the light *id*.

	**light_set_intensity** (rw, id, intensity)
		Sets the *intensity* of the light *id*.

	**light_set_spot_angle** (rw, id, angle)
		Sets the spot *angle* of the light *id*.

PhysicsWorld
=============

	**gravity** (pw) : Vector3
		Returns the gravity.

	**set_gravity** (pw, gravity)
		Sets the gravity.

	**raycast** (pw, from, dir, length, mode) : table
		Returns the actors which intersects the raycast.
		Mode can be either ``closest`` or ``all``.

	**enable_debug_drawing** (pw, enable)
		Sets whether to *enable* debug drawing.

Actor
-----

	**actor_instances** (pw, unit) : Id
		Returns the actor of the *unit*.

	**actor_world_position** (pw, actor) : Vector3
		Returns the world position of the actor.

	**actor_world_rotation** (pw, actor) : Quaternion
		Returns the world rotation of the actor.

	**actor_world_pose** (pw, actor) : Matrix4x4
		Returns the world pose of the actor.

	**actor_teleport_world_position** (pw, actor, position)
		Teleports the actor to the given world position.

	**actor_teleport_world_rotation** (pw, actor, rotation)
		Teleports the actor to the given world rotation.

	**actor_teleport_world_pose** (pw, actor, pose)
		Teleports the actor to the given world pose.

	**actor_center_of_mass** (pw, actor) : Vector3
		Returns the center of mass of the actor.

	**actor_enable_gravity** (pw, actor)
		Enables gravity for the actor.

	**actor_disable_gravity** (pw, actor)
		Disables gravity for the actor.

	**actor_enable_collision** (pw, actor)
		Enables collision detection for the actor.

	**actor_disable_collision** (pw, actor)
		Disables collision detection for the actor.

	**actor_set_collision_filter** (pw, actor, name)
		Sets the collision filter of the actor.

	**actor_set_kinematic** (pw, actor, kinematic)
		Sets whether the actor is kinematic or not.
		Note that this call has no effect on static actors.

	**actor_move** (pw, actor, position)
		Moves the actor to *pos*
		Note that this call only affects nonkinematic actors.

	**actor_is_static** (pw, actor) : bool
		Returns whether the actor is static.

	**actor_is_dynamic** (pw, actor) bool
		Returns whether the actor is dynamic.

	**actor_is_kinematic** (pw, actor) : bool
		Returns whether the actor is kinematic (keyframed).

	**actor_is_nonkinematic** (pw, actor) : bool
		Returns whether the actor is nonkinematic (i.e. dynamic and not kinematic).

	**actor_linear_damping** (pw, actor) : float
		Returns the linear damping of the actor.

	**actor_set_linear_damping** (pw, actor, damping)
		Sets the linear damping of the actor.

	**actor_angular_damping** (pw, actor) : float
		Returns the angular damping of the actor.

	**actor_set_angular_damping** (pw, actor, rate)
		Sets the angular damping of the actor.

	**actor_linear_velocity** (pw, actor) : Vector3
		Returns the linear velocity of the actor.

	**actor_set_linear_velocity** (pw, actor, velocity)
		Sets the linear velocity of the actor.
		Note that this call only affects nonkinematic actors.

	**actor_angular_velocity** (pw, actor) : Vector3
		Returns the angular velocity of the actor.

	**actor_set_angular_velocity** (pw, actor, velocity)
		Sets the angular velocity of the actor.
		Note that this call only affects nonkinematic actors.

	**actor_add_impulse** (pw, actor, impulse)
		Adds a linear impulse (acting along the center of mass) to the actor.
		Note that this call only affects nonkinematic actors.

	**actor_add_impulse_at** (pw, actor, impulse, position)
		Adds a linear impulse (acting along the world position *pos*) to the actor.
		Note that this call only affects nonkinematic actors.

	**actor_add_torque_impulse** (pw, actor, impulse)
		Adds a torque impulse to the actor.

	**actor_push** (pw, actor, velocity, mass)
		Pushes the actor as if it was hit by a point object with the given *mass*
		travelling at the given *velocity*.
		Note that this call only affects nonkinematic actors.

	**actor_push_at** (pw, actor, velocity, mass, position)
		Like push() but applies the force at the world position *pos*.
		Note that this call only affects nonkinematic actors.

	**actor_is_sleeping** (pw, actor) : bool
		Returns whether the actor is sleeping.

	**actor_wake_up** (pw, actor)
		Wakes the actor up.

SoundWorld
===========

	**stop_all** (sound_world)
		Stops all the sounds in the world.

	**pause_all** (sound_world)
		Pauses all the sounds in the world

	**resume_all** (sound_world)
		Resumes all previously paused sounds in the world.

	**is_playing** (sound_world, id) : bool
		Returns whether the sound *id* is playing.

ResourcePackage
================

	**load** (package)
		Loads all the resources in the package.
		Note that the resources are not immediately available after the call is made,
		instead, you have to poll for completion with has_loaded().

	**unload** (package)
		Unloads all the resources in the package.

	**flush** (package)
		Waits until the package has been loaded.

	**has_loaded** (package) : bool
		Returns whether the package has been loaded.

Device
======

	**argv** () : table
		Returns a table containing the command line parameters the engine was started with.

	**platform** () : string
		Returns a string identifying what platform the engine is running on.
		It can be either ``android``, ``linux`` or ``windows``

	**architecture** () : string
		Returns a string identifying what architecture the engine is running on.
		It can be either ``32-bit`` or ``64-bit``.

	**version** () : string
		Returns a string identifying the engine version.
		The form is "major.minor.micro".

	**last_delta_time** () : float
		Returns the time in seconds needed to render the last frame

	**quit** ()
		Quits the application.

	**resolution** () : float, float
		Returns the main window resolution (width, height).

	**create_world** () : World
		Creates a new world.

	**destroy_world** (world)
		Destroys the given *world*.

	**render** (world, camera)
		Renders *world* using *camera*.

	**create_resource_package** (name) : ResourcePackage
		Returns the resource package with the given *package_name* name.

	**destroy_resource_package** (package)
		Destroy a previously created resource *package*.
		Note that to unload the resources loaded by the package, you have to call
		ResourcePackage.unload() first.

	**console_send** (table)
		Sends the given lua *table* to clients connected to the engine.
		Values can be either nil, bool, number, string, table, array, Vector2, Vector3, Quaternion, Matrix4x4 or Color4.

	**can_get** (type, name) : bool
		Returns whether the resource (type, name) is loaded.
		When resource autoload is enabled it always returns true.

	**enable_resource_autoload** (enable)
		Sets whether resources should be automatically loaded when accessed.

	**temp_count** () : int, int, int
		Returns the number of temporary objects used by Lua.

	**set_temp_count** (nv, nq, nm)
		Sets the number of temporary objects used by Lua.

	**guid** () : string
		Returns a new GUID.

DebugGui
========

	**rect** (pos, size, material_resource, color)
		Draws a rectangle.

	**image** (pos, size, material_resource, color)
		Draws an image.

	**image_uv** (pos, size, uv0, uv1, material_resource, color)
		Draws an image with explicit UV coordinates.

	**text** (pos, font_size, str, font_resource, material_resource, color)
		Draws text.

DebugLine
=========

	**add_line** (debug_line, start, end, color)
		Adds a line from *start* to *end* with the given *color*.

	**add_axes** (debug_line, tm, length)
		Adds lines for each axis with the given *length*.

	**add_circle** (debug_line, center, radius, normal, color, [segments = 36])
		Adds a circle at *center* with the given *radius* and *normal* vector.

	**add_cone** (debug_line, from, to, radius, color, [segments = 36])
		Adds a cone with the base centered at *from* and the tip at *to*.

	**add_sphere** (debug_line, center, radius, color, [segments = 36])
		Adds a sphere at *center* with the given *radius*.

	**add_obb** (debug_line, tm, half_extents, color)
		Adds an orientd bounding box. *tm* describes the position and orientation of
		the box. *half_extents* describes the size of the box along the axis.

	**add_unit** (debug_line, tm, name, color)
		Adds the meshes from the unit *name*.

	**reset** (debug_line)
		Resets all the lines.

	**submit** (debug_line)
		Submits the lines to renderer for drawing.

Input
=====

Keyboard
--------

	**name** () : string
		Returns the name of keyboard.

	**connected** () : bool
		Returns whether the keyboard is connected and functioning.

	**num_buttons** () : int
		Returns the number of buttons of the keyboard.

	**num_axes** () : int
		Returns the number of axes of the keyboard.

	**pressed** (id) : bool
		Returns whether the button *id* is pressed in the current frame.

	**released** (id) : bool
		Returns whether the button *id* is released in the current frame.

	**any_pressed** () : bool
		Returns whether any button is pressed in the current frame.

	**any_released** () : bool
		Returns whether any button is released in the current frame.

	**button_name** (id) : string
		Returns the name of the button *id*.

	**button_id** (name) : int
		Returns the *id* of the button *name*.

Keyboard Button Names
~~~~~~~~~~~~~~~~~~~~~

	* ``tab``, ``enter``, ``escape``, ``space``, ``backspace``
	* ``num_lock``, ``numpad_enter``, ``numpad_.``, ``numpad_*``, ``numpad_+``, ``numpad_-``, ``numpad_/``, ``numpad_0``, ``numpad_1``, ``numpad_2``, ``numpad_3``, ``numpad_4``, ``numpad_5``, ``numpad_6``, ``numpad_7``, ``numpad_8``, ``numpad_9``
	* ``f1``, ``f2``, ``f3``, ``f4``, ``f5``, ``f6``, ``f7``, ``f8``, ``f9``, ``f10``, ``f11``, ``f12``
	* ``home``, ``left``, ``up``, ``right``, ``down``, ``page_up``, ``page_down``, ``insert``, ``delete``, ``end``
	* ``left_ctrl``, ``right_ctrl``, ``left_shift``, ``right_shift``, ``caps_lock``, ``left_alt``, ``right_alt``, ``left_super``, ``right_super``
	* ``0``, ``1``, ``2``, ``3``, ``4``, ``5``, ``6``, ``7``, ``8``, ``9``
	* ``a``, ``b``, ``c``, ``d``, ``e``, ``f``, ``g``, ``h``, ``i``, ``j``, ``k``, ``l``, ``m``, ``n``, ``o``, ``p``, ``q``, ``r``, ``s``, ``t``, ``u``, ``v``, ``w``, ``x``, ``y``, ``z``

Keyboard Axis Names
~~~~~~~~~~~~~~~~~~~

	None.

Mouse
-----

	**name** () : string
		Returns the name of the mouse.

	**connected** () : bool
		Returns whether the mouse is connected and functioning.

	**num_buttons** () : int
		Returns the number of buttons of the mouse.

	**num_axes** () : int
		Returns the number of axes of the mouse.

	**pressed** (id) : bool
		Returns whether the button *id* is pressed in the current frame.

	**released** (id) : bool
		Returns whether the button *id* is released in the current frame.

	**any_pressed** () : bool
		Returns whether any button is pressed in the current frame.

	**any_released** () : bool
		Returns whether any button is released in the current frame.

	**axis** (id) : Vector3
		Returns the value of the axis *id*.

	**button_name** (id) : string
		Returns the name of the button *id*.

	**axis_name** (id) : string
		Returns the name of the axis *id*.

	**button_id** (name) : int
		Returns the *id* of the button *name*.

	**axis_id** (name) : int
		Returns the *id* of the axis *name*.

Mouse Button Names
~~~~~~~~~~~~~~~~~~

	``left``, ``middle``, ``right``, ``extra_1``, ``extra_2``

Mouse Axis Names
~~~~~~~~~~~~~~~~

	* ``cursor``: Returns the cursor position (x, y) in screen coordinates.
	* ``cursor_delta``: Returns the delta of the cursor position (x, y) since last frame.
	* ``wheel``: Returns the movement of the mouse wheel in the y axis. Positive values of y mean upward scrolling, negative values mean downward scrolling.

Touch
-----

	**name** () : string
		Returns the name of the touch.

	**connected** () : bool
		Returns whether the touch is connected and functioning.

	**num_buttons** () : int
		Returns the number of buttons of the touch.

	**num_axes** () : int
		Returns the number of axes of the touch.

	**pressed** (id) : bool
		Returns whether the button *id* is pressed in the current frame.

	**released** (id) : bool
		Returns whether the button *id* is released in the current frame.

	**any_pressed** () : bool
		Returns whether any button is pressed in the current frame.

	**any_released** () : bool
		Returns whether any button is released in the current frame.

	**axis** (id) : Vector3
		Returns the value of the axis *id*.

	**button_name** (id) : string
		Returns the name of the button *id*.

	**axis_name** (id) : string
		Returns the name of the axis *id*.

	**button_id** (name) : int
		Returns the *id* of the button *name*.

	**axis_id** (name) : int
		Returns the *id* of the axis *name*.

Pad1, Pad2, Pad3, Pad4
----------------------

	**name** () : string
		Returns the name of the pad.

	**connected** () : bool
		Returns whether the pad is connected and functioning.

	**num_buttons** () : int
		Returns the number of buttons of the pad.

	**num_axes** () : int
		Returns the number of axes of the pad.

	**pressed** (id) : bool
		Returns whether the button *id* is pressed in the current frame.

	**released** (id) : bool
		Returns whether the button *id* is released in the current frame.

	**any_pressed** () : bool
		Returns whether any button is pressed in the current frame.

	**any_released** () : bool
		Returns whether any button is released in the current frame.

	**axis** (id) : Vector3
		Returns the value of the axis *id*.

	**button_name** (id) : string
		Returns the name of the button *id*.

	**axis_name** (id) : string
		Returns the name of the axis *id*.

	**button_id** (name) : int
		Returns the *id* of the button *name*.

	**axis_id** (name) : int
		Returns the *id* of the axis *name*.

Pad Button Names
~~~~~~~~~~~~~~~~

	* ``up``, ``down``, ``left``, ``right``
	* ``start``, ``back``, ``guide``
	* ``left_thumb``, ``right_thumb``
	* ``left_shoulder``, ``right_shoulder``
	* ``a``, ``b``, ``x``, ``y``

Pad Axis Names
~~~~~~~~~~~~~~

	* ``left``, ``right``: Returns the direction (x, y) of the left or right thumbstick [-1; +1]. The z element represents the left or right trigger [0; +1].

Profiler
========

	**enter_scope** (name)
		Starts a new profile scope with the given *name*.

	**leave_scope** ()
		Ends the last profile scope.

	**record** (name, value)
		Records *value* with the given *name*. Value can be either number or Vector3.

Display
=======

	**modes** () : table
		Returns an array of display modes. See `Display Mode`_.

	**set_mode** (id)
		Sets the display mode *id*.
		The initial display mode is automatically reset when the program terminates.

Display Mode
------------

	Display mode is a lua table with 3 fields:

	* ``id``: The id of the display mode.
	* ``width``: The width of the display mode.
	* ``height``: The height of the display mode.

Window
======

	**show** ()
		Shows the window.

	**hide** ()
		Hides the window.

	**resize** (width, height)
		Resizes the window to *width* and *height*.

	**move** (x, y)
		Moves the window to *x* and *y*.

	**minimize** ()
		Minimizes the window.

	**restore** ()
		Restores the window.

	**title** () : string
		Returns the title of the window.

	**set_title** (title)
		Sets the title of the window.

	**show_cursor** (show)
		Sets whether to *show* the cursor.