Class BufferSystem

System plugin to the renderer to manage buffers.

WebGL uses Buffers as a way to store objects to the GPU. This system makes working with them a lot easier.

Buffers are used in three main places in WebGL

  • geometry information
  • Uniform information (via uniform buffer objects - a WebGL 2 only feature)
  • Transform feedback information. (WebGL 2 only feature)

This system will handle the binding of buffers to the GPU as well as uploading them. With this system, you never need to work directly with GPU buffers, but instead work with the PIXI.Buffer class.

Memberof

PIXI

Implements

Constructors

constructor

Properties

boundBufferBases CONTEXT_UID gl managedBuffers

Methods

bind bindBufferBase bindBufferRange dispose disposeAll unbind update

Constructors

constructor

Properties

ReadonlyboundBufferBases

boundBufferBases: { [key: number]: Buffer }

Cache keeping track of the base bound buffer bases

CONTEXT_UID

CONTEXT_UID: number

gl

gl: IRenderingContext

ReadonlymanagedBuffers

managedBuffers: { [key: number]: Buffer }

Cache for all buffers by id, used in case renderer gets destroyed or for profiling

Methods

bind

  • bind(buffer: Buffer): void

  • This binds specified buffer. On first run, it will create the webGL buffers for the context too

    Parameters

    • buffer: Buffer

      the buffer to bind to the renderer

    Returns void

bindBufferBase

  • bindBufferBase(buffer: Buffer, index: number): void

  • Binds an uniform buffer to at the given index.

    A cache is used so a buffer will not be bound again if already bound.

    Parameters

    • buffer: Buffer

      the buffer to bind

    • index: number

      the base index to bind it to.

    Returns void

bindBufferRange

  • bindBufferRange(buffer: Buffer, index?: number, offset?: number): void

  • Binds a buffer whilst also binding its range. This will make the buffer start from the offset supplied rather than 0 when it is read.

    Parameters

    • buffer: Buffer

      the buffer to bind

    • Optionalindex: number

      the base index to bind at, defaults to 0

    • Optionaloffset: number

      the offset to bind at (this is blocks of 256). 0 = 0, 1 = 256, 2 = 512 etc

    Returns void

dispose

  • dispose(buffer: Buffer, contextLost?: boolean): void

  • Disposes buffer

    Parameters

    • buffer: Buffer

      buffer with data

    • OptionalcontextLost: boolean

      If context was lost, we suppress deleteVertexArray

    Returns void

disposeAll

  • disposeAll(contextLost?: boolean): void

  • dispose all WebGL resources of all managed buffers

    Parameters

    • OptionalcontextLost: boolean

      If context was lost, we suppress gl.delete calls

    Returns void

unbind

update

  • update(buffer: Buffer): void

  • Will ensure the data in the buffer is uploaded to the GPU.

    Parameters

    • buffer: Buffer

      the buffer to update

    Returns void

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