This is an Aframe library for rust. It's still fairly experimental and a lot might change. I started writing this for a bit of fun to see if I could play with aframe from inside a yew app. It started getting pretty large so I decided to abstract away all the yew-specific stuff and start making a library on its own. There's still a bunch missing and a bunch to do here, but what IS there is functional.
The high-level API for components is composed of 5 macros:
- component_def!: The component_def! macro allows the definition of new components. Its signature is as follows:
rust
component_def!
(
$(dependencies: $($deps:expr),*;)?
$(schema: $schema:expr,)?
$(multiple: $mult:expr,)?
$(init: $init:expr,)?
$(update: $update:expr,)?
$(tick: $tick:expr,)?
$(tock: $tock:expr,)?
$(remove: $remove:expr,)?
$(pause: $pause:expr,)?
$(play: $play:expr,)?
$(update_schema: $update_schema:expr,)?
)
All parameteres are optional, although the order must be exactly as shown. dependencies should be a comma-separated list of strings followed by a semicolon. schema should be a HashMap with string keys and Property values. multiple is a boolean value. The rest are strings containing javascript code. A js! macro is provided to allow inline javascript code to be included in the Rust code (See the docs for the js! macro for caveats and limitations). Here's an example:
rust
let spin = component_def!
(
dependencies: "rotation";
schema: hashmap!
{
"radiansPerMillisecond" => Property::number(0.00116355333.into()),
"speedMult" => Property::number(1.0.into()),
"axis" => Property::string(Cow::Borrowed("x").into()),
"autoplay" => Property::boolean(true.into())
},
multiple: true,
init: js!
(
this.radians = Math.PI * 2;
this.initalRotation = this.el.object3D.rotation.clone();
),
update: js!(oldData =>> this.rotation = this.el.object3D.rotation;),
tick: js!
(time, delta =>>
if (this.data.autoplay)
{
var amount = this.data.radiansPerMillisecond * delta * this.data.speedMult;
if (this.data.axis.includes('x'))
this.rotation.x = (this.rotation.x + amount) % this.radians;
if (this.data.axis.includes('y'))
this.rotation.y = (this.rotation.y + amount) % this.radians;
if (this.data.axis.includes('z'))
this.rotation.z = (this.rotation.z + amount) % this.radians;
}
),
remove: js!(this.rotation.copy(this.initialRotation);),
pause: js!(this.data.autoplay = false;),
play: js!(this.data.autoplay = true;),
);
This example defines a component which causes an entity's rotation to be updated on a loop, creating a spinning effect. This can then be registered in aframe via the following:
rust
unsafe
{
spin.register("spin");
}
We now have access to the spin component with the 4 properties defined in schema.
- component_struct!: While component_def! creates a component that Aframe can access from its own runtime, the component_struct! macro creates a Rust struct that mimics the internal details of that Aframe component. Component structs are already provided for Aframe's built-in components (WIP: not all components are defined yet. Once all aframe components are defined, calling component_struct! should only be necessary for locally-defined components. Once all components from Aframe have been defined, component_def! and component_struct! may be merged into a single macro to do the heavy-lifting of both at once). Its signature is as follows:
rust
macro_rules! component_struct
{
($name:ident $(, $field:ident: $field_name:literal $ty:ty = $default:expr)*) => {...};
($name:ident $(:$alt:ident)? $fmt:expr $(, $field:ident: $field_name:literal $ty:ty = $default:expr)*) => {...}
An example is as follows:
rust
component_struct!
(Sound,
src: "src" Cow<'static, str> = Cow::Borrowed(""),
autoplay: "autoplay" bool = false,
positional: "positional" bool = true,
volume: "volume" f32 = 1.0,
looping: "loop" bool = false,
additional_field_map: "" AdditionalFieldMap = AdditionalFieldMap { /* ... */ }
);
- component!: The component! macro is a simple syntax-sugar for creating a specific instance of a componentstruct. As every componentstruct contains default values, this macro allows instantiation of a component without redundant re-definition of those default values. For example: component!{component::Camera} will create a camera component with all its fields set to default values, whereas component!{component::Camera, active = false} will create a camera component with all its fields set to default values except the active field.
- simple_enum! - The simple_enum! macro defines an enum in which each variant maps to a single string. This can be combined with component_def! to crate fields with a limited number of possiblities. For example:
rust
simple_enum!
(Autoplay,
Null => "null",
True => "true",
False => "false"
);
component_struct!
(Animation,
// ...
autoplay: "autoplay" Autoplay = Autoplay::Null,
// ...
);
- complex_enum! - The complex_enum! macro defines an enum in which each variant maps to an arbitrary number of fields which will themselves be flattened into fields of the component itself. For example:
rust
complex_enum!
(AnimationLoop,
Amount "{}" => { looping: u32 },
Forever "true" => {}
);
component_struct!
(Animation,
// ...
looping: "loop" AnimationLoop = AnimationLoop::Amount{looping: 0},
// ...
);
Another example is as follows:
rust
complex_enum!
(GeometryPrimitive,
Box
"primitive: box; width: {}; height: {}; depth: {}; segmentsWidth: {}; \
segmentsHeight: {}; segmentsDepth: {}" =>
{
width: f32,
height: f32,
depth: f32,
segments_width: u32,
segments_height: u32,
segments_depth: u32
},
Circle
"primitive: circle; radius: {}; segments: {}; \
thetaStart: {}; thetaLength: {}" =>
{
radius: f32,
segments: u32,
theta_start: f32,
theta_length: f32
},
// ...
);
component_struct!
(Geometry,
primitive: "" GeometryPrimitive = GeometryPrimitive::Box
{
width: 1.0,
height: 1.0,
depth: 1.0,
segments_width: 1,
segments_height: 1,
segments_depth: 1,
},
// ...
);
A component_struct is simply a type that implements these 2 traits:
```rust
pub trait Component: Display + std::fmt::Debug + std::any::Any
{
fn clone(&self) -> Box
pub trait ConstDefault { const DEFAULT: Self; } ```
As long as clone provides a valid clone, eq provides a valid equality check, and as_map provides a serialization of keys to values that Aframe can understand, and a DEFAULT value is provided that can be evaluated at compile time, a struct is a valid component.
A component_reg is slightly more complicated, but details on its low-level API may be added here at a later date.
The entity! macro defines the high-level API for describing entities, with one form for describing general entities and another for defining specific primitives:
rust
(
$(attributes: $(($attr_id:literal, $attr_value:expr)),*)? $(,)?
$(components: $(($cmp_id:literal, $cmp_value:expr)),*)? $(,)?
$(children: $($child:expr),*)?
)
and
rust
(
primitive: $name:literal,
$(attributes: $(($attr_id:literal, $attr_value:expr)),*)? $(,)?
$(components: $(($cmp_id:literal, $cmp_value:expr)),*)? $(,)?
$(children: $($child:expr),*)?
)
respectively.
Here's an example of a general entity definition: ```rust
entity!
{
attributes: ("id", "cube-rig"),
components:
("position", component::Position{x: 0.0, y: 2.5, z: -2.0}),
("sound", component!
{
component::Sound,
src: Cow::Borrowed("#ambientmusic"),
volume: 0.5
}),
("play-sound-on-event", component!
{
component::PlaySoundOnEvent,
mode: component::PlaySoundOnEventMode::ToggleStop,
event: Cow::Borrowed("click")
}),
("light", component!
{
component::Light,
lighttype: component::LightType::Point
{
decay: 1.0,
distance: 50.0,
shadow: component::OptionalLocalShadow::NoCast{},
},
intensity: 0.0
}),
("animationmouseenter", component!
{
component::Animation,
property: Cow::Borrowed("light.intensity"),
to: Cow::Borrowed("1.0"),
startevents: component::List(Cow::Borrowed(&[Cow::Borrowed("mouseenter")])),
dur: 250
}),
("animationmouseleave", component!
{
component::Animation,
property: Cow::Borrowed("light.intensity"),
to: Cow::Borrowed("0.0"),
startevents: component::List(Cow::Borrowed(&[Cow::Borrowed("mouseleave")])),
dur: 250
}),
children: entity!
{
primitive: "ramen-cube",
attributes: ("id", "ramen-cube"),
components:
}
},
and here's an example of a primitive definition:
rust
entity!
{
primitive: "ramen-cube",
attributes: ("id", "ramen-cube"),
components:
}
```
Primitives can be defined via the following macro signature:
rust
(
components: $(($name:expr, $cmp:expr)),*
mappings: $(($map_name:expr, $map_expr:expr)),*
)
Here's an example of a primitive definition and a following registry with Aframe:
```rust let prim = primitive! { components: ("position", component::Position{ x: 0.0, y: -2.0, z: -1.0 }), ("rotation", component::Rotation { x: 0.0, y: 45.0, z: 0.0 }), ("spin", component!(super::component::Spin, axis: super::component::Axis::Y)), ("geometry", component!(component::Geometry)), ("animation_click", component! { component::Animation, property: Cow::Borrowed("rotation"), from: Cow::Borrowed("0 45 0"), to: Cow::Borrowed("0 405 0"), startevents: component::List(Cow::Borrowed(&[Cow::Borrowed("click")])), dur: 900, easing: component::Easing::EaseOutCubic }), ("shadow", component!(component::Shadow)), ("material", component! { component::Material, props: component::MaterialProps(Cow::Owned(vec!((Cow::Borrowed("src"), Cow::Borrowed("#ramen"))))) }) mappings: ("src", "material.src"), ("depth", "geometry.depth"), ("height", "geometry.height"), ("width", "geometry.width") }; unsafe { match prim.register("ramen-cube") { Ok(_) => (), Err(err) => yew::services::ConsoleService::log(&format!("{:?}", err)) } }
```
The Shader struct provides all the tools necessary to define an Aframe shader. The maplit crate is recommended for simplifying shader definitions. See below:
```rust use maplit::; use aframe::shader::;
pub const SIMPLEVS: &str = includestr!("./SOMEPATH/glsl/simple.vs"); pub const STROBEFS: &str = includestr!("./SOMEPATH/glsl/strobe.fs");
Shader::new
(
hashmap!
{
"speedMult".into() => Property::number(IsUniform::Yes, 1.0.into()),
"alpha".into() => Property::number(IsUniform::Yes, 1.0.into()),
"alpha2".into() => Property::number(IsUniform::Yes, 1.0.into()),
"color".into() => Property::color(IsUniform::Yes, color::BLACK.into()),
"color2".into() => Property::color(IsUniform::Yes, color::WHITE.into()),
"iTime".into() => Property::time(IsUniform::Yes, None)
},
SIMPLEVS.into(),
STROBEFS.into()
// Calling register will send this data to the AFRAME.registerShader function.
).register("strobe")?;
```
TODO
The lowest-level calls to Aframe are defined in the sys module:
```rust
extern { #[wasmbindgen(jsnamespace = AFRAME)] pub fn registerPrimitive(name: &str, definition: JsValue); #[wasmbindgen(jsnamespace = AFRAME)] pub fn registerComponent(name: &str, data: JsValue); #[wasmbindgen(jsnamespace = AFRAME)] pub fn registerShader(name: &str, data: JsValue); } ```
Using this should not be necessary for the usage of this crate, but the public APIs have been provided while this crate is still feature-incomplete.
The yew_support feature adds yew support to this crate. At its core, all this does is implement From<&Scene> for Html. This allows you to write a yew component as such:
```rust static INIT: AtomicBool = AtomicBool::new(false);
pub struct AframeProps { scene: aframe::Scene }
pub struct Aframe { props: AframeProps }
impl crate::utils::Component for Aframe { type Message = Msg; type Properties = AframeProps;
fn create(props: Self::Properties, _: ComponentLink<Self>) -> Self
{
// Register aframe stuff first time only
if !INIT.load(Ordering::Relaxed)
{
unsafe
{
// Code in this block registers shaders, components, and primitives with aframe
shaders::register_shaders();
component::register_components();
primitive::register_primitives();
}
INIT.store(true, Ordering::Relaxed)
}
Self
{
props
}
}
fn update(&mut self, _: Self::Message) -> ShouldRender
{
true
}
fn change(&mut self, _props: Self::Properties) -> ShouldRender
{
false
}
fn view(&self) -> Html
{
(&self.props.scene).into()
}
} ```
Below is a full definition of how the scene is defined in yew:
```rust
html!
{
// FPS display
entity!
{
// TODO: Make a constant for the fps & text components
attributes: ("id", "fps-display"), ("text", "color: green; value: Text"),
components:
("position", component::Position { x: 0.0, y: 1.5, z: -1.0 }),
("fps", component!(component::Fps))
},
// Hands
entity!
{
// TODO: Some fancier way to add/build mixins
// TODO: Make a constant for all these components
attributes: ("id", "left-controller"), ("mixin", "intersect_ray"), ("vr-mode-watcher", "true"),
("restrict-entity", "states: vr"), ("laser-controls", "hand: left"),
("crawling-cursor", "target: #vr-cursor"), ("line", "color: red; opacity: 0.75")
},
entity!
{
// TODO: Some fancier way to add/build mixins
// TODO: Make a constant for all these components
attributes: ("id", "right-controller"), ("mixin", "intersect_ray"), ("vr-mode-watcher", "true"),
("restrict-entity", "states: vr"), ("laser-controls", "hand: right"),
("crawling-cursor", "target: #vr-cursor"), ("line", "color: red; opacity: 0.75")
},
// The vr cursor
entity!
{
// TODO: Make a constant for vr-mode-watcher & restrict-entity
attributes: ("id", "vr-cursor"), ("vr-mode-watcher", "true"), ("restrict-entity", "states: vr"),
components: ("geometry", component!
{
component::Geometry,
primitive: component::GeometryPrimitive::Ring
{
radius_inner: 0.06,
radius_outer: 0.2,
segments_theta: 32,
segments_phi: 8,
theta_start: 0.0,
theta_length: 360.0
}
}),
("material", component!
{
component::Material,
props: component::MaterialProps(Cow::Borrowed(&CURSOR_COLOR)),
opacity: 0.7
})
}
},
entity!
{
attributes: ("id", "cube-rig"),
components:
("position", component::Position{x: 0.0, y: 2.5, z: -2.0}),
("sound", component!
{
component::Sound,
src: Cow::Borrowed("#ambient_music"),
volume: 0.5
}),
("play-sound-on-event", component!
{
component::PlaySoundOnEvent,
mode: component::PlaySoundOnEventMode::ToggleStop,
event: Cow::Borrowed("click")
}),
("light", component!
{
component::Light,
light_type: component::LightType::Point
{
decay: 1.0,
distance: 50.0,
shadow: component::OptionalLocalShadow::NoCast{},
},
intensity: 0.0
}),
("animation__mouseenter", component!
{
component::Animation,
property: Cow::Borrowed("light.intensity"),
to: Cow::Borrowed("1.0"),
start_events: component::List(Cow::Borrowed(&[Cow::Borrowed("mouseenter")])),
dur: 250
}),
("animation__mouseleave", component!
{
component::Animation,
property: Cow::Borrowed("light.intensity"),
to: Cow::Borrowed("0.0"),
start_events: component::List(Cow::Borrowed(&[Cow::Borrowed("mouseleave")])),
dur: 250
}),
children: entity!
{
primitive: "ramen-cube",
attributes: ("id", "ramen-cube"),
components: // None
}
},
// Ambient light
entity!
{
attributes: ("id", "ambient-light"),
components: ("light", component!
{
component::Light,
light_type: component::LightType::Ambient{},
color: color::GREY73,
intensity: 0.2
})
},
// Directional light
entity!
{
attributes: ("id", "directional-light"),
components:
("position", component::Position{ x: 0.5, y: 1.0, z: 1.0 }),
("light", component!
{
component::Light,
light_type: component::LightType::Directional
{
shadow: component::OptionalDirectionalShadow::Cast
{
shadow: component!
{
component::DirectionalShadow
}
}
},
color: color::WHITE,
intensity: 0.1
})
},
// The sky
entity!
{
primitive: "a-sky",
attributes: ("id", "sky"),
components: ("material", component!
{
component::Material,
shader: Cow::Borrowed("strobe"),
props: component::MaterialProps(Cow::Owned(vec!
(
(Cow::Borrowed("color"), Cow::Borrowed("black")),
(Cow::Borrowed("color2"), Cow::Borrowed("#222222"))
)))
})
},
// The ocean
entity!
{
primitive: "a-ocean",
attributes: ("id", "water"), ("depth", "100"), ("width", "100"), ("amplitude", "0.5"),
components: ("material", component!
{
component::Material,
shader: Cow::Borrowed("water"),
props: component::MaterialProps(Cow::Owned(vec!((Cow::Borrowed("transparent"), Cow::Borrowed("true")))))
})
}
}
} />
} ```