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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/bindFramebuffer below:

WebGLRenderingContext: bindFramebuffer() method - Web APIs

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

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