WebGLRenderingContext.getBufferParameter() - Web APIs 编辑

The WebGLRenderingContext.getBufferParameter() method of the WebGL API returns information about the buffer.

Syntax

any gl.getBufferParameter(target, pname);

Parameters

target

A Glenum specifying the target buffer object. Possible values:

• gl.ARRAY_BUFFER: Buffer containing vertex attributes, such as vertex coordinates, texture coordinate data, or vertex color data.
• gl.ELEMENT_ARRAY_BUFFER: Buffer used for element indices.
• When using a WebGL 2 context, the following values are available additionally:
  • gl.COPY_READ_BUFFER: Buffer for copying from one buffer object to another.
  • gl.COPY_WRITE_BUFFER: Buffer for copying from one buffer object to another.
  • gl.TRANSFORM_FEEDBACK_BUFFER: Buffer for transform feedback operations.
  • gl.UNIFORM_BUFFER: Buffer used for storing uniform blocks.
  • gl.PIXEL_PACK_BUFFER: Buffer used for pixel transfer operations.
  • gl.PIXEL_UNPACK_BUFFER: Buffer used for pixel transfer operations.

pname

A Glenum specifying information to query. Possible values:

• gl.BUFFER_SIZE: Returns a GLint indicating the size of the buffer in bytes.
• gl.BUFFER_USAGE: Returns a GLenum indicating the usage pattern of the buffer. This is either:
  • gl.STATIC_DRAW,
  • gl.DYNAMIC_DRAW,
  • gl.STREAM_DRAW.
  • When using a WebGL 2 context, the following values are available additionally:
    • gl.STATIC_READ,
    • gl.DYNAMIC_READ,
    • gl.STREAM_READ,
    • gl.STATIC_COPY,
    • gl.DYNAMIC_COPY,
    • gl.STREAM_COPY.

Return value

Depends on the requested information (as specified with pname). Either a GLint or a GLenum.

Examples

gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE);

Specifications

Browser compatibility

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See also

• WebGLRenderingContext.bindBuffer()
• WebGLRenderingContext.createBuffer()
• WebGLRenderingContext.deleteBuffer()
• WebGLRenderingContext.bufferData()
• Other buffers: WebGLFramebuffer, WebGLRenderbuffer