title: OpenGL FrameBuffer upside down and bottom right
body: <p>So I'm making an engine which can use directx10,11 and opengl.</p>
  
  <p>So far everything worked well. It can render an image in opengl and directx correctly and both look the same.</p>
  
  <p>Now I added rendertargets. Within DirectX it works very well and there is no problem so far. But using OpenGL the texture which I draw before is upside down and on the bottom right of the rendertarget.</p>
  
  <p>&nbsp;&nbsp;<img src="https://i.stack.imgur.com/7kyfg.png" alt="Screenshot"></p>
  
  <p>Do you guys have an idea what the problem is? And why does it work without the rendertarget correctly?</p>
  
  <p>If needed I can send some code. I just need to sort it first.</p>