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POFlash performance for game dev: native render VS BitmapData framebuffer
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  1. POFlash performance for game dev: native render VS BitmapData framebuffer
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    copied!<p>I develop a 2D shooter game with <em>lots of objects</em> and <em>aggressive scrolling</em>.</p> <p><strong>QUESTION:</strong> which way is better?</p> <p>CHOICE 1 - use native Flash rendering:</p> <ul> <li>derive game objects from Bitmap, use existing x, y, width, height, bitmapData</li> <li>add all objects as children UIComponent.addChild(...) to sccreen</li> <li>clip visible area using "scrollRect"</li> </ul> <p>CHOICE 2 - write custom rendering using "bitmap + copyPixels"</p> <ul> <li>use own game object with x, y, width, height, bitmapData</li> <li>add a Bitmap to a screen, take bitmapData from it</li> <li>redraw every ENTER_FRAME: bitmapData.lock(), iterate over game objects and copyPixels() into bitmapData, then bitmapData.unlock()</li> <li>custom clipping: do not render out of screen objects</li> </ul> <p>Here in this <a href="https://stackoverflow.com/questions/989471/vsync-in-flex-flash-as3">question</a> some people complain that "bitmap + copyPixels()" is slow.</p> <p><strong>EXPERIMENT:</strong> I have implemented both techniques:</p> <ul> <li><a href="http://sites.google.com/site/oshyshko/framebuffer_vs_nativerender/main_1_more_creeps.swf?attredirects=0" rel="nofollow noreferrer">main_1.swf</a> - native</li> <li><a href="http://sites.google.com/site/oshyshko/framebuffer_vs_nativerender/main_2_more_creeps.swf?attredirects=0" rel="nofollow noreferrer">main_2.swf</a> - custom</li> </ul> <p>Please, try them and tell which one is better (faster, smoother, eats less CPU).</p> <p>Wait until there will be <em>at least 250 enemies</em> (counter above the screen).<br> <strong>UPDATE:</strong> Try to open Task Manager (or $top) and see overall CPU usage</p> <p><strong>UPDATE 2:</strong> I've changed the code, now creeps spawn much faster.</p>
 

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