WebGLRenderingContext: bindFramebuffer() method

The WebGLRenderingContext.bindFramebuffer() method of the WebGL API binds to the specified target the provided WebGLFramebuffer, or, if the framebuffer argument is null, the default WebGLFramebuffer, which is associated with the canvas rendering context.

Syntax

bindFramebuffer(target, framebuffer)

Parameters

target

A GLenum specifying the binding point (target). Possible values:

gl.FRAMEBUFFER

Collection buffer data storage of color, alpha, depth and stencil buffers used as both a destination for drawing and as a source for reading (see below).

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

gl.DRAW_FRAMEBUFFER

Used as a destination for drawing operations such as gl.draw*, gl.clear* and gl.blitFramebuffer.

gl.READ_FRAMEBUFFER

Used as a source for reading operations such as gl.readPixels and gl.blitFramebuffer.

framebuffer

A WebGLFramebuffer object to bind, or null for binding the HTMLCanvasElement or OffscreenCanvas object associated with the rendering context.

Return value

None (undefined).

Exceptions

A gl.INVALID_ENUM error is thrown if target is not gl.FRAMEBUFFER, gl.DRAW_FRAMEBUFFER, or gl.READ_FRAMEBUFFER.

Examples

Binding a frame buffer

const canvas = document.getElementById("canvas");
const gl = canvas.getContext("webgl");
const framebuffer = gl.createFramebuffer();

gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);

Getting current bindings

To check the current frame buffer binding, query the FRAMEBUFFER_BINDING constant.

gl.getParameter(gl.FRAMEBUFFER_BINDING);

Specifications

Browser compatibility

See also

• WebGLRenderingContext.createFramebuffer()
• WebGLRenderingContext.deleteFramebuffer()
• WebGLRenderingContext.isFramebuffer()
• Other buffers: WebGLBuffer, WebGLRenderbuffer