I just start to program with my Mac. At first, I want to write a Game like a simpe Tetris-Clone, running on OS 9, OS X and perhaps on Windows. Because I want to program later 3D-Graphics, I think I us C++ and OpenGL. Is it a good idea to write a 2D Game with 2D-Sprites in OpenGL?
Thank you very much for a comprehensive answer
This will work fine. This will also get you around such issues as screen reolution, etc.
Mind you, people without a 3D accelerator probably won't like you very much