GraphicsDevice
Extends: EventHandler
The graphics device manages the underlying graphics context. It is responsible for submitting render state changes and graphics primitives to the hardware. A graphics device is tied to a specific canvas HTML element. It is valid to have more than one canvas element per page and create a new graphics device against each.
Summary
Properties
boneLimit | The maximum number of supported bones using uniform buffers. |
canvas | The canvas DOM element that provides the underlying WebGL context used by the graphics device. |
fullscreen | Fullscreen mode. |
height | Height of the back buffer in pixels. |
insideRenderPass | |
maxAnisotropy | The maximum supported texture anisotropy setting. |
maxCubeMapSize | The maximum supported dimension of a cube map. |
maxPixelRatio | Maximum pixel ratio. |
maxTextureSize | The maximum supported dimension of a texture. |
maxVolumeSize | The maximum supported dimension of a 3D texture (any axis). |
precision | The highest shader precision supported by this graphics device. |
scope | The scope namespace for shader attributes and variables. |
shaders | |
supportsInstancing | True if hardware instancing is supported. |
targets | |
textureFloatRenderable | True if 32-bit floating-point textures can be used as a frame buffer. |
textureHalfFloatRenderable | True if 16-bit floating-point textures can be used as a frame buffer. |
textures | |
width | Width of the back buffer in pixels. |
Methods
destroy | Destroy the graphics device. |
getRenderTarget | Queries the currently set render target on the device. |
setIndexBuffer | Sets the current index buffer on the graphics device. |
setRenderTarget | Sets the specified render target on the device. |
setVertexBuffer | Sets the current vertex buffer on the graphics device. |
Events
resizecanvas | Fired when the canvas is resized. |
Inherited
Methods
fire | Fire an event, all additional arguments are passed on to the event listener. |
hasEvent | Test if there are any handlers bound to an event name. |
off | Detach an event handler from an event. |
on | Attach an event handler to an event. |
once | Attach an event handler to an event. |
Details
Constructor
GraphicsDevice()
Properties
The canvas DOM element that provides the underlying WebGL context used by the graphics device.
The highest shader precision supported by this graphics device. Can be 'hiphp', 'mediump' or 'lowp'.
True if 32-bit floating-point textures can be used as a frame buffer.
True if 16-bit floating-point textures can be used as a frame buffer.
Methods
destroy()
Destroy the graphics device.
getRenderTarget()
Queries the currently set render target on the device.
// Get the current render target
var renderTarget = device.getRenderTarget();
Returns
RenderTargetThe current render target.
setIndexBuffer(indexBuffer)
Sets the current index buffer on the graphics device. On subsequent calls to GraphicsDevice#draw, the specified index buffer will be used to provide index data for any indexed primitives.
Parameters
indexBuffer | IndexBuffer | The index buffer to assign to the device. |
setRenderTarget(renderTarget)
Sets the specified render target on the device. If null is passed as a parameter, the back buffer becomes the current target for all rendering operations.
// Set a render target to receive all rendering output
device.setRenderTarget(renderTarget);
// Set the back buffer to receive all rendering output
device.setRenderTarget(null);
Parameters
renderTarget | RenderTarget | The render target to activate. |
setVertexBuffer(vertexBuffer)
Sets the current vertex buffer on the graphics device. On subsequent calls to GraphicsDevice#draw, the specified vertex buffer(s) will be used to provide vertex data for any primitives.
Parameters
vertexBuffer | VertexBuffer | The vertex buffer to assign to the device. |
Events
resizecanvas
Fired when the canvas is resized.
Parameters
width | number | The new width of the canvas in pixels. |
height | number | The new height of the canvas in pixels. |
Inherited
Methods
fire(name, [arg1], [arg2], [arg3], [arg4], [arg5], [arg6], [arg7], [arg8])
Fire an event, all additional arguments are passed on to the event listener.
obj.fire('test', 'This is the message');
Parameters
name | string | Name of event to fire. |
arg1 | * | First argument that is passed to the event handler. |
arg2 | * | Second argument that is passed to the event handler. |
arg3 | * | Third argument that is passed to the event handler. |
arg4 | * | Fourth argument that is passed to the event handler. |
arg5 | * | Fifth argument that is passed to the event handler. |
arg6 | * | Sixth argument that is passed to the event handler. |
arg7 | * | Seventh argument that is passed to the event handler. |
arg8 | * | Eighth argument that is passed to the event handler. |
Returns
EventHandlerSelf for chaining.
hasEvent(name)
Test if there are any handlers bound to an event name.
obj.on('test', function () { }); // bind an event to 'test'
obj.hasEvent('test'); // returns true
obj.hasEvent('hello'); // returns false
Parameters
name | string | The name of the event to test. |
Returns
booleanTrue if the object has handlers bound to the specified event name.
off([name], [callback], [scope])
Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.
var handler = function () {
};
obj.on('test', handler);
obj.off(); // Removes all events
obj.off('test'); // Removes all events called 'test'
obj.off('test', handler); // Removes all handler functions, called 'test'
obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this
Parameters
name | string | Name of the event to unbind. |
callback | HandleEventCallback | Function to be unbound. |
scope | object | Scope that was used as the this when the event is fired. |
Returns
EventHandlerSelf for chaining.
on(name, callback, [scope])
Attach an event handler to an event.
obj.on('test', function (a, b) {
console.log(a + b);
});
obj.fire('test', 1, 2); // prints 3 to the console
Parameters
name | string | Name of the event to bind the callback to. |
callback | HandleEventCallback | Function that is called when event is fired. Note the callback is limited to 8 arguments. |
scope | object | Object to use as 'this' when the event is fired, defaults to current this. |
Returns
EventHandlerSelf for chaining.
once(name, callback, [scope])
Attach an event handler to an event. This handler will be removed after being fired once.
obj.once('test', function (a, b) {
console.log(a + b);
});
obj.fire('test', 1, 2); // prints 3 to the console
obj.fire('test', 1, 2); // not going to get handled
Parameters
name | string | Name of the event to bind the callback to. |
callback | HandleEventCallback | Function that is called when event is fired. Note the callback is limited to 8 arguments. |
scope | object | Object to use as 'this' when the event is fired, defaults to current this. |
Returns
EventHandlerSelf for chaining.