I've looked at a ton of articles and SO questions about OpenGL not drawing, common mistakes, etc. This one is stumping me.

I've tried several different settings for `glOrtho`, different vertex positions, colors, etc., all to no avail.

I **can confirm** the OpenGL state is valid because the clear color *is* purple in the code (meaning the window *is* purple). gDEBugger is also confirming frames are being updated (so is Fraps).

Here is the code. Lines marked as "didn't help" were not there originally, and were things that I tried and failed.

```
QTWindow::QTWindow( )
{
    // Enable mouse tracking
    this->setMouseTracking(true);
}

void QTWindow::initializeGL()
{
    // DEBUG
    debug("Init'ing GL");
    this->makeCurrent(); ///< Didn't help
    this->resizeGL(0, 0); ///< Didn't help
    glDisable(GL_CULL_FACE); ///< Didn't help
    glClearColor(1, 0, 1, 0);
}

void QTWindow::paintGL()
{
    // DEBUG
    debug("Painting GL");
    this->makeCurrent(); ///< Didn't help
    glLoadIdentity();
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0,1,1);
    glBegin(GL_TRIANGLES);
    glVertex2f(500,100);
    glVertex2f(100,500);
    glVertex2f(0,0);
    glEnd();
    this->swapBuffers(); ///< Didn't help
}

void QTWindow::resizeGL(int width, int height)
{
    // DEBUG
    debug("Resizing GL");
    this->makeCurrent(); ///< Didn't help
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, 1000, 0, 1000, -1, 1);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

```

The triangle is not being displayed at all, even with culling turned off. However, all three debug logs are called exactly how they should be.

What am I missing?