* Improve performance of panning the viewport with OpenGL renderer
* Use a shader to perform the copy rect operation
* Clear the frame buffer after its initialized
* Handle Y flip in shader, be explicit about FBO draw state
* Target 330 core, remove the y flip handling
* Explicitly use GL_RGB8 and not GL_RGB
* Add more error handling, clear depth when depth is created
* Lets try this
* Make sure blend and depth are disabled
* Bind the source fbo for reading
* Try this alternative approach
* Set read and draw buffer before glBlitFramebuffer
* Apple is forcing my hand
* Update changelog.txt
