WebGLRenderingContext: getBufferParameter() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers.

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

getBufferParameter(target, pname)

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.

A GLenum specifying information to query. Possible values:

Returns a GLint indicating the size of the buffer in bytes.

Returns a GLenum indicating the usage pattern of the buffer. One of the following:

When using a WebGL 2 context, the following values are available additionally:

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

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

Specification
WebGL Specification # 5.14.5
WebGL 2.0 Specification # 3.7.3

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