Question

I understand that cocos2d it’s really simple API, and that I can use it to do simple and huge 2D or even sometimes 3D games/applications. As well I understand that OpenGL it’s more complicated, it’s lower level API etc.

Question:
What is better for implementing 2D/3D games?
Why do we need to learn OpenGL if we have simple frameworks like cocos2d?
What you can do with OpenGL that you can’t do with cocos2d?

Thanks in advance!

Answer 1

What is better for implementing 2D/3D games?

• Hard to tell, but a higher level API is always there to make things easier for you. For example you are writing a 2D shootem up. You will likely use a game loop, you will want to use sprites and make those move on the screen. You may want animations like explosions taking place. You’ll end up writing your own higher level API to do those things. Cocos2D has solved those problems for you already. Any other frameworld should have solved it.

Why do we need to learn OpenGL if we have simple frameworks like cocos2d?

• In case you like to cusomize the standard behaviour of a framework, especially the drawing part, you should get into openGL. If there is something you like to have which doesn’t come out of the box you may find yourself reimplementing a base framework class. For example, look at the shaders used in Cocos2D 2.0. If you like some special blending mode, like a tinting effect, you won’t get it for free. There is a colour attribute for a CCSprite but this may not be the result you’re expecting. So you’ll have to write your own shader and plug it into the sprite you like to be displayed in a different way.

What you can do with OpenGL that you can’t do with cocos2d?

• This comparison doesn’t really work out, since cocos2d facilitates opengGL for the drawing part to build up that higher level api and make your life easier as a game developer.