Sint.JS

Class: WebGLRenderer

SINT.WebGLRenderer

The WebGLRenderer draws the scene and all its content onto a webGL enabled canvas. This renderer should be used for browsers that support webGL. This Render works by automatically managing webGLBatchs. So no need for Sprite Batches or Sprite Clouds. Don't forget to add the view to your DOM or you will not see anything :)

new SINT.WebGLRenderer (options)

Name Type Description
options object optional

The optional renderer parameters

Name Type Default Description
width number 800 optional

the width of the screen
height number 600 optional

the height of the screen
view HTMLCanvasElement optional

the canvas to use as a view, optional
transparent boolean false optional

If the render view is transparent, default false
autoResize boolean false optional

If the render view is automatically resized, default false
antialias boolean false optional

sets antialias. If not available natively then FXAA antialiasing is used
forceFXAA boolean false optional

forces FXAA antialiasing to be used over native. FXAA is faster, but may not always look as great
resolution number 1 optional

The resolution / device pixel ratio of the renderer. The resolution of the renderer retina would be 2.
clearBeforeRender boolean true optional

This sets if the renderer will clear the canvas or not before the new render pass. If you wish to set this to false, you must set preserveDrawingBuffer to true.
preserveDrawingBuffer boolean false optional

enables drawing buffer preservation, enable this if you need to call toDataUrl on the webgl context.
roundPixels boolean false optional

If true SINTJS will Math.floor() x/y values when rendering, stopping pixel interpolation.
backgroundColor number 0x000000 optional

The background color of the rendered area (shown if not transparent).
legacy boolean false optional

If true SINTJS will aim to ensure compatibility with older / less advanced devices. If you experience unexplained flickering try setting this to true.
powerPreference string optional

Parameter passed to webgl context, set to "high-performance" for devices with dual graphics card

Extends

Members

_activeRenderTarget SINT.RenderTarget

Holds the current render target

_activeShader SINT.Shader

Holds the current shader

autoResize boolean inherited overrides

Whether css dimensions of canvas view should be resized to screen dimensions automatically

backgroundColor number inherited overrides

The background color to fill if not transparent

blendModes object.<string, mixed> inherited overrides

Tracks the blend modes useful for this renderer.

boundTextures Array

Holds the current state of textures bound to the GPU.

clearBeforeRender boolean inherited overrides

This sets if the CanvasRenderer will clear the canvas or not before the new render pass. If the scene is NOT transparent SINTJS will use a canvas sized fillRect operation every frame to set the canvas background color. If the scene is transparent SINTJS will use clearRect to clear the canvas every frame. Disable this by setting this to false. For example if your game has a canvas filling background image you often don't need this set.

currentRenderer SINT.ObjectRenderer

The currently active ObjectRenderer.

emptyRenderer SINT.ObjectRenderer

An empty renderer.

filterManager SINT.FilterManager

Manages the filters.

height number readonly inherited overrides

Same as view.height, actual number of pixels in the canvas by vertical

Default Value:
  • 600

maskManager SINT.MaskManager

Manages the masks using the stencil buffer.

options Object readonly inherited overrides

The supplied constructor options.

plugins object readonly

Collection of installed plugins. These are included by default in SINT, but can be excluded by creating a custom build. Consult the README for more information about creating custom builds and excluding plugins.

Properties:
Name Type Description
accessibility SINT.accessibility.AccessibilityManager

Support tabbing interactive elements.
extract SINT.extract.WebGLExtract

Extract image data from renderer.
interaction SINT.interaction.InteractionManager

Handles mouse, touch and pointer events.
prepare SINT.prepare.WebGLPrepare

Pre-render display objects.

preserveDrawingBuffer boolean inherited overrides

The value of the preserveDrawingBuffer flag affects whether or not the contents of the stencil buffer is retained after rendering.

resolution number inherited overrides

The resolution / device pixel ratio of the renderer

Default Value:
  • 1

roundPixels boolean inherited overrides

If true SINTJS will Math.floor() x/y values when rendering, stopping pixel interpolation. Handy for crisp pixel art and speed on legacy devices.

screen SINT.Rectangle inherited overrides

Measurements of the screen. (0, 0, screenWidth, screenHeight)

Its safe to use as filterArea or hitArea for whole stage

state SINT.WebGLState

The currently active ObjectRenderer.

stencilManager SINT.StencilManager

Manages the stencil buffer.

textureManager SINT.TextureManager

Manages textures

transparent boolean inherited overrides

Whether the render view is transparent

type number overrides

The type of this renderer as a standardised const

See:

view HTMLCanvasElement inherited overrides

The canvas element that everything is drawn to

width number readonly inherited overrides

Same as view.width, actual number of pixels in the canvas by horizontal

Default Value:
  • 800

Methods

bindRenderTarget (renderTarget)SINT.WebGLRenderer

Changes the current render target to the one given in parameter

Name Type Description
renderTarget SINT.RenderTarget

the new render target
Returns:
Type Description
SINT.WebGLRenderer Returns itself.

bindRenderTexture (renderTexture, transform)SINT.WebGLRenderer

Binds a render texture for rendering

Name Type Description
renderTexture SINT.RenderTexture

The render texture to render
transform SINT.Matrix

The transform to be applied to the render texture
Returns:
Type Description
SINT.WebGLRenderer Returns itself.

bindShader (shader, autoProject)SINT.WebGLRenderer

Changes the current shader to the one given in parameter

Name Type Default Description
shader SINT.Shader

the new shader
autoProject boolean true optional

Whether automatically set the projection matrix
Returns:
Type Description
SINT.WebGLRenderer Returns itself.

bindTexture (texture, location, forceLocation)number

Binds the texture. This will return the location of the bound texture. It may not be the same as the one you pass in. This is due to optimisation that prevents needless binding of textures. For example if the texture is already bound it will return the current location of the texture instead of the one provided. To bypass this use force location

Name Type Description
texture SINT.Texture

the new texture
location number

the suggested texture location
forceLocation boolean

force the location
Returns:
Type Description
number bound texture location

bindVao (vao)SINT.WebGLRenderer

Changes the current Vao to the one given in parameter

Name Type Description
vao SINT.VertexArrayObject

the new Vao
Returns:
Type Description
SINT.WebGLRenderer Returns itself.

clear (clearColor)

Erases the active render target and fills the drawing area with a colour

Name Type Description
clearColor number optional

The colour

clearRenderTexture (renderTexture, clearColor)SINT.WebGLRenderer

Erases the render texture and fills the drawing area with a colour

Name Type Description
renderTexture SINT.RenderTexture

The render texture to clear
clearColor number optional

The colour
Returns:
Type Description
SINT.WebGLRenderer Returns itself.

createVao ()VertexArrayObject

Creates a new VAO from this renderer's context and state.

Returns:
Type Description
VertexArrayObject The new VAO.

destroy (removeView) overrides

Removes everything from the renderer (event listeners, spritebatch, etc...)

Name Type Default Description
removeView boolean false optional

Removes the Canvas element from the DOM. See: https://github.com/SINTjs/SINT.js/issues/2233

flush ()

This should be called if you wish to do some custom rendering It will basically render anything that may be batched up such as sprites

generateTexture (displayObject, scaleMode, resolution, region)SINT.Texture inherited overrides

Useful function that returns a texture of the display object that can then be used to create sprites This can be quite useful if your displayObject is complicated and needs to be reused multiple times.

Name Type Description
displayObject SINT.DisplayObject

The displayObject the object will be generated from
scaleMode number

Should be one of the scaleMode consts
resolution number

The resolution / device pixel ratio of the texture being generated
region SINT.Rectangle optional

The region of the displayObject, that shall be rendered, if no region is specified, defaults to the local bounds of the displayObject.
Returns:
Type Description
SINT.Texture a texture of the graphics object

registerPlugin (pluginName, ctor)

Adds a plugin to the renderer.

Name Type Description
pluginName string

The name of the plugin.
ctor function

The constructor function or class for the plugin.

render (displayObject, renderTexture, clear, transform, skipUpdateTransform)

Renders the object to its webGL view

Name Type Description
displayObject SINT.DisplayObject

the object to be rendered
renderTexture SINT.RenderTexture

The render texture to render to.
clear boolean optional

Should the canvas be cleared before the new render
transform SINT.Matrix optional

A transform to apply to the render texture before rendering.
skipUpdateTransform boolean optional

Should we skip the update transform pass?

reset ()SINT.WebGLRenderer

Resets the WebGL state so you can render things however you fancy!

Returns:
Type Description
SINT.WebGLRenderer Returns itself.

resize (screenWidth, screenHeight) overrides

Resizes the webGL view to the specified width and height.

Name Type Description
screenWidth number

the new width of the screen
screenHeight number

the new height of the screen

setBlendMode (blendMode)

Resizes the webGL view to the specified width and height.

Name Type Description
blendMode number

the desired blend mode

setObjectRenderer (objectRenderer)

Changes the current renderer to the one given in parameter

Name Type Description
objectRenderer SINT.ObjectRenderer

The object renderer to use.

setTransform (matrix)

Sets the transform of the active render target to the given matrix

Name Type Description
matrix SINT.Matrix

The transformation matrix

unbindTexture (texture)SINT.WebGLRenderer

unbinds the texture ...

Name Type Description
texture SINT.Texture

the texture to unbind
Returns:
Type Description
SINT.WebGLRenderer Returns itself.