Opengl 3.1 Android

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Giraldo Allain

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Aug 3, 2024, 4:56:55 PM8/3/24

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I want to learn OpenGL ES directly since I'm targeting my development to android, however. I want to learn OpenGL ES in order to develop my 2D games. I chose it for performances purpose (since basic SurfaceView drawing isn't that efficient when it comes to RT games).My question is: where to start?I've spent over a month browsing Google and reading/trying some tutorials/examples I've found anywhere but to be honest, it didn't help much and this is for two reasons:

I've tried to read some source code too (ex.: replica island) but the codes are too complicated and contains a lot of things that aren't necessary; result: I get lost among 100 .java files with weird class names and stuff.

I guess there's no course like the one I'm looking for, but I'll be very glad if somebody could give me some guidelines and some links maybe to learn what I'm up to (only OpenGL ES 2D Sprites rendering! nothing 3D).

Take a loot at the replica island source code file: GameRenderer.java for how to setup your canvas with the proper GL flags for 2D (sprite) rendering.You should really take a look at SpriteMethodTest by the same author of replica island: -for-android/source/browse/trunk/SpriteMethodTest

I need some help finding information (or an example) of how to use texture compression for Android. I have a lot of PNG's right now and I need to reduce the amount of memory they take up. I was looking at PVR compression but I can't figure out how to use this within OpenGL.

In short, if your textures don't have alpha, you can use ETC1. If they do have alpha, and you want to support all devices, you must have your textures compressed in the other three types and load them according to the device.

You should not use just PVR compression on Android, since that will not work with all models. To get around that you should either only use ETC1 (mandated on all GLES 2.0 devices) or have separate texture packs for separate GPU modes. The android dev guide has a helper class to load the compression format.

I'm creating 3D game for android and I want it to use maps. I'd like to use rendered map tiles as textures for 3D objects in OpenGL ES 2.0 (I want to make an impression like the player was walking on the map - in fact, on the 3D object covered with map texture). As far as I know, it is possible, but I have completely no idea where to start and I can't find any tutorial. Everything I've found is about using MapView in osm-using APIs and it's not what I mean.