CODEWITHSUNDEEP
c++qtopengl
Cartier
Cartier

Reputation: 426

Unable to call OpenGL related functions outside of InitializeGL and paintGL

As the title suggests, inside of Qt, I am unable to use, or call any OpenGL functions outside of QGLWidget functions like initializeGL(), and paintGL().

I am trying to build a 3D model, after a slot from my QMainWindow class is called. Everything appears to work fine, all of the vertices are loaded, however, when I try and draw my model, I get a NULL reference exception; which occurs, most often, when too few Vertexes are provided.

The same building function works when I use it in initializeGL().

Upvotes: 3

Views: 1340

Answers (1)

Jagoly
Jagoly

Reputation: 1009

This is actually quite simple: outside of those functions, the QGLWidget's context is not current. You can make the context current by calling QGLWidet::makeCurrent(). A perhaps better way to get around this is to defer calling any GL functions to within paintGL, as that ensures that the context is current, and you don't risk messing with any other openGL stuff by changing the context.

Upvotes: 7

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