Cocos2d Performance Tips
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1. Use nonatomic properties for primitive types like floats to avoid locking. 2. Use CCArray instead of NSMutableArray for better performance in cocos2d. Iterate arrays using CC_ARRAY_FOREACH. 3. Use index access instead of indexOfObject to improve performance of lookups in for loops.
![for
for ( int i = 0;i < self.numObjects; i++ ) {
... hoge[i]
}
indexOfObject](https://image.slidesharecdn.com/cocos2dtips-111210091703-phpapp01/85/Cocos2d-Performance-Tips-5-320.jpg)
Cocos2d Performance Tips
- 2. 1. nonatomic !! @property(nonatomic,assign) float altitude;
- 3. 2. NSMutableArray NSArray CCArray enumerator for ( CellObject *object in objects ) { ... }
- 4. cocos2d ( 0.9.x ) CC_ARRAY_FOREACH CellObject *object; CC_ARRAY_FOREACH(objects,object) { ... }
- 5. for for ( int i = 0;i < self.numObjects; i++ ) { ... hoge[i] } indexOfObject
- 6. 3. float count length
- 7. 4. float double float 32bit double 64bit 100
- 8. 5. break
- 9. 6. tips 2 (x1,y1),(x2,y2)
- 10. float xd = endpoint.x - startpoint.x; float yd = endpoint.y - endpoint.y; float comparedist = 100 * 100; distance = xd * xd + yd * yd; if (distance > comparedist) { ... }
- 11. sqrt http://en.wikipedia.org/wiki/Fast_inverse_square_root float fast_sqrt(float number) { long i; float x, y; const float f = 1.5f; x = number * 0.5f; y = number; i = *(long*) &y; i = 0x5f3759df - ( i >> 1 ); y = *(float*) &i; y = y * ( f - ( x * y * y ) ); y = y * ( f - ( x * y * y ) ); return number * y; }
- 12. http://iphonedevelopment.blogspot.com/2009/03/speed-with- catch.html iPhone InvSqrt Normalize
- 13. 7.
- 14. RELEASE
- 15. Challenge optimizing your code!!