WebGLRenderingContext: bindFramebuffer() method

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

Syntax

js-nolint

bindFramebuffer(target, framebuffer)

Parameters

target
- : A {{domxref("WebGL_API/Types", "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 {{domxref("WebGL2RenderingContext", "WebGL 2 context", "", 1)}}, 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 {{domxref("WebGLFramebuffer")}} object to bind, or null for binding the {{domxref("HTMLCanvasElement")}} or {{domxref("OffscreenCanvas")}} object associated with the rendering context.

Return value

None ({{jsxref("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);