CODEWITHSUNDEEP
c++openglopengl-3
May Oakes
May Oakes

Reputation: 4619

glBindFramebuffer causes an "invalid operation" GL error when using the GL_DRAW_FRAMEBUFFER target

I'm using OpenGL 3.3 on a GeForce 9800 GTX. The reference pages for 3.3 say that an invalid operation with glBindFramebuffer indicates a framebuffer ID that was not returned from glGenFramebuffers. Yet, I output the ID returned by glGenFramebuffers and the ID I send later to glBindFramebuffer and they are the same.

The GL error goes away, however, when I change the target parameter in glBindFramebuffer from GL_DRAW_FRAMEBUFFER to GL_FRAMEBUFFER. The documentation says I should be able to use GL_DRAW_FRAMEBUFFER. Is there any case in which you can't bind to GL_DRAW_FRAMEBUFFER? Is there any harm from using GL_FRAMEBUFFER instead of GL_DRAW_FRAMEBUFFER? Is this a symptom of a larger problem?

Upvotes: 2

Views: 4606

Answers (1)

Nicol Bolas
Nicol Bolas

Reputation: 473222

If glBindFramebuffer(GL_FRAMEBUFFER) works when glBindFramebuffer(GL_DRAW_FRAMEBUFFER) does not, and we're not talking about the EXT version of these functions and enums (note the lack of "EXT" suffixes), then it's likely that you may have done something wrong. GL_INVALID_OPERATION is the error you get when multiple combinations of parameters that depend on different state are in conflict. If it were just a missing enum, you should get GL_INVALID_ENUM.

Of course, it could just be a driver bug too. But there's no way to know without knowing what your code looks like.

Upvotes: 2

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