CODEWITHSUNDEEP
opengl
Alex
Alex

Reputation: 3181

Displaying a framebuffer in OpenGL

I've been learning a bit of OpenGL lately, and I just got to the Framebuffers.

So by my current understanding, if you have a framebuffer of your own, and you want to draw the color buffer onto the window, you'll need to first draw a quad, and then wrap the texture over it? Is that right? Or is there something like glDrawArrays(), glDrawElements() version for framebuffers?

It seems a bit... Odd (clunky? Hackish?) to me that you have to wrap a texture over a quad in order to draw the framebuffer. This doesn't have to be done with the default framebuffer. Or is that done behind your back?

Upvotes: 0

Views: 1538

Answers (1)

Bahbar
Bahbar

Reputation: 18005

Well. The main point of framebuffer objects is to render scenes to buffers that will not get displayed but rather reused somewhere, as a source of data for some other operation (shadow maps, High dynamic range processing, reflections, portals...).

If you want to display it, why do you use a custom framebuffer in the first place?

Now, as @CoffeeandCode comments, there is indeed a glBlitFramebuffer call to allow transfering pixels from one framebuffer to another. But before you go ahead and use that call, ask yourself why you need that extra step. It's not a free operation...

Upvotes: 1

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