cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   ob1
   Member

   As I have said sometimes already, I am a total openGL noob.

   In my game, I have a black semi-transparent ColorLayer to simulate night mode.

   Works pretty well, apart from the fact that sprites representing "luminous" elements should stay bright unlike the background. Is there any blending or other trick that can help ?

   Otherwise, is the only possibility to put the "lighted" elements on a new layer ? Which raises a question, is the Z offset only for a single layer ? I tried to change the Z offset of the sprites that should show in front of the ColorLayer but that didn't work.

   Posted 2 years ago #
2. 

   Clain
   Member

   Don't know about any openGL trick (I'm pretty much an openGL n00b too).

   As for another layer on top of the others for the luminous elements : I don"t know if it's the only possibility but it is one. The z order as you guessed is layer/node specific.

   Posted 2 years ago #
3. 

   ob1
   Member

   The problem with having a top layer is this.

   Imagine I have a lamp post and a tree. The tree is partially in front of the lamp post.

   So we have the ColorLayer must be in front of the tree, the tree in front of the lamp post, and the lamp post in front of the ColorLayer :-/

   Posted 2 years ago #
4. 

   Clain
   Member

   I hope you like love triangles stories ;)

   An openGL trick would be nice indeed. Meanwhile, here is a very hacky solution you may have thought of already ; each of your sprites can have 2 textures (only one at the same time) : one for day and one for night. You could subclass Sprite and add some variables and functions regarding night and day textures. It would double the size/number or your png/pvr files though.

   Posted 2 years ago #
5. 

   patrickC
   Member

   This is a thought, and something I kinda did in my game to get the gui to display lazily.
   If you enable the depth buffer in opengl, when you go an draw your luminous sprites (or the ones that need to be on top), you can change the depth function to let it pass (GL_ALWAYS), then switch it back to the normal (GL_LEQUAL).
   Just a thought.

   Posted 2 years ago #

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