glFramebufferBinding

glFramebufferBinding is a constant used in OpenGL to query or set the binding point for framebuffers. When you call glGetIntegerv with glFramebufferBinding, it returns the name of the currently bound framebuffer object. Framebuffer objects are essential for rendering to textures or off-screen buffers instead of the default window. The binding point determines which framebuffer object is currently active for rendering operations.

The default framebuffer, often referred to as the window-system-provided framebuffer or the screen, has a name of 0. When you bind a framebuffer object using glBindFramebuffer, you specify a target, typically GL_FRAMEBUFFER, and the name of the framebuffer object you wish to bind. If you want to unbind the currently bound framebuffer object and revert to rendering to the default framebuffer, you would bind a framebuffer object with the name 0.

Understanding glFramebufferBinding is crucial for implementing techniques such as render-to-texture, deferred rendering, and post-processing effects, where intermediate rendering results are stored in textures for later use. Querying the current framebuffer binding can be useful for debugging or for ensuring that rendering operations are directed to the intended destination. It is a fundamental concept in managing OpenGL rendering targets.