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What I don't get is why you're writing it from scratch? There are over a dozen high-quality C++ game engines you can use.

A quick list: http://nuverian.net/2011/01/17/the-best-game-engines-for-ind...

As for what's "good performance," ask yourself: what's the clock speed of your CPU, and how much work are you really trying to do? Say you've got a 2 GHz CPU. A 300 FPS rate, is 2,000,000,000 Hz/300 Hz = 6.6 million clock ticks per frame, on a single core. A modern CPU can be really good about using those ticks very well. You can do some dumb blitting to figure out the I/O overhead for getting to the screen.




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