title: Is it possible to use glScalef on a bitmap that is drawn with glBitmap?
body: <p>I'm making a text renderer that uses FreeType 2 and legacy OpenGL. Problem is, FreeType 2's coordinate system has (0, 0) in the top left corner while OpenGL's coordinate system is Cartesian. This means I have to flip the bitmap. I expected glScalef to work with glBitmap but it has no effect. Can anyone tell me if it's possible to flip a bitmap vertically with glScalef, or if it is not possible, point me to some other source that can flip a bitmap upside down (Preferably efficiently as possible)?</p>
  <pre><code>glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glScalef(1.0, -1.0, 1.0)
  glBitmap(size_x, size_y, 0, 0, xadd, yadd, (GLubyte *) bitmap);
  </code></pre>