OSystem_SDL will create a merged list of all graphics modes from SDL and OpenGL. When the user changes the graphics mode in options and restarts ScummVM should switch to that graphics mode in the corresponding graphics manager.
svn-id: r51493
This fixes a hack for resetting the graphics scale to x1 when starting games that have a large screen size. The SDL graphics manager should now scale back to x1 without changing the current scaler in use, as well as the OpenGL graphics manager.
svn-id: r51492
Now the hotkey Ctrl-Alt-Enter will switch between all available fullscreen modes. Alt-Enter will only switch to the best mode available, and exit fullscreen mode if already on it.
The different aspect ratios can be switched with Ctrl-Alt-A. The normal mode will stretch the contents to the screen, while other modes will stretch only one dimension to the screen size, and maintain the aspect ratio for the other dimension.
svn-id: r51346
Removed the extra surface in GLTexture. Now there are copies of the texture data in their original format (so engine can get the original data when lockScreen or grabOverlay is called). This copies will be updated when the engine calls a function that modifies the game screen/overlay, and the textures will be marked as dirty. When updating screen, the textures will be updated from the copies data if they are dirty.
svn-id: r51234
