OpenGL invalid framebuffer operation after glClear(GL_COLOR_BUFFER_BIT);

qt opengl error-handling osx-lion framebuffer
houbysoft picture houbysoft · Jun 18, 2012 · Viewed 10.9k times · Source

Every time after I call glClear(GL_COLOR_BUFFER_BIT);, I get the OpenGL error "invalid framebuffer operation".

The call seems to work just fine, and nothing seems wrong. I call glClear(GL_COLOR_BUFFER_BIT); first thing in the ::paintGL() method.

Huh? Should I just disregard this error?

Answer

James picture James · Jul 27, 2012

My best guess is that your framebuffer is not complete and calling glClear on an incomplete framebuffer is throwing the error.

Check the status of the framebuffer using glCheckFramebufferStatus and make sure it returns GL_FRAMEBUFFER_COMPLETE.

Related questions

How to work with OpenGL and QT?

I'm Working on a small project and i need to work with OpenGL + QT I'm Newbie in both of them. So i need a good tutorial that illustrates how to work with them each other not individually is it better …

Read More
How do I render a triangle in QOpenGLWidget?

I'm trying to use OpenGL inside of Qt using QOpenGLWidget, but I am having a hard time finding any relevant examples. I am new to OpenGL, so I am trying to learn how to use it, but the tutorials that …

Read More
Easiest way for offscreen rendering with QOpenGLWidget

I have a hidden QOpenGLWidget (Qt 5.4.2, NOT QGLWidget) and I want to basically continually do grab() or grabFramebuffer() to get its content (and write it to disk). The widget renders fine when visible, but does not when hidden. If I …

Read More