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How to implement Uniform Grid for collision detection

I want to implement a unifrom grid to use for collision detection in my 2D Java game. This way instead of checking for each game object if it collides with any other object on the screen, I only check ...
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How expensive is binding an OpenGL buffer object that is already bound?

I'd like to know how slow/fast it is to call glBindBuffer() on a buffer that is already bound to the same target. Or is it better to cache this information in my code? Would it be faster to always ...
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Drawing and rotating bitmaps (with transparency) efficiently in Android

I just started making a game for Android and I'm already having some issues regarding performance. You can imagine the game as being some kind of Tower Defense game with a top-view, and the enemies ...