Android OpenGL ES and 2D [closed]

I was in a similar situation.
The way I started with openGL with start by looking at the very basic GLSurfaceView samples/demos.

Start, by setting up your app activity, and set up the basic canvas.

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: http://code.google.com/p/apps-for-android/source/browse/trunk/SpriteMethodTest

See this question where I posted my own code: Using OpenGL to replace Canvas - Android

After you have your canvas set up, you start by calling something like: gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

After that you're ready to render a sprite. First, you'll need to load the sprite into a texture: http://qdevarena.blogspot.com/2009/02/how-to-load-texture-in-android-opengl.html

However, this is the tutorial that really helped me out with loading sprites: http://tkcodesharing.blogspot.com/2008/05/working-with-textures-in-androids.html

This is how I do it, I have a class named Texture.java:

public class Texture { /*Begin public declarations*/ public float x = 0; public float y = 0; public float z = 0; public float width = 0; public float height = 0; /*Begin Private Declarations*/ private GL10 gl; public int[] texture; //holds the texture in integer form private int texture_name; private int[] mCropWorkspace; private final BitmapFactory.Options sBitmapOptions; /*Begin Methods*/ public Texture( GL10 gl_obj ) { gl = gl_obj; texture = new int[1]; mCropWorkspace = new int[4]; sBitmapOptions = new BitmapFactory.Options(); sBitmapOptions.inPreferredConfig = Bitmap.Config.RGB_565; //Log.d(TAG, "Initializing Texture Object"); } public int get_texture_name( ) { return texture_name; } /*Loads the resource to memory*/ public boolean Load( Bitmap bitmap ) //rename this to glLoad and don't have it as an initializer parameter { /*many thanks to sprite method test if this works*/ if ( gl == null ) { Log.e(TAG, "Failed to load resource. Context/GL is NULL"); return false; } int error; int textureName = -1; gl.glGenTextures(1, texture, 0); textureName = texture[0]; //Log.d(TAG, "Generated texture: " + textureName); gl.glBindTexture(GL10.GL_TEXTURE_2D, textureName); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE); gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_REPLACE); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); mCropWorkspace[0] = 0; mCropWorkspace[1] = bitmap.getHeight(); mCropWorkspace[2] = bitmap.getWidth(); mCropWorkspace[3] = -bitmap.getHeight(); ((GL11) gl).glTexParameteriv(GL10.GL_TEXTURE_2D, GL11Ext.GL_TEXTURE_CROP_RECT_OES, mCropWorkspace, 0); error = gl.glGetError(); if (error != GL10.GL_NO_ERROR) { Log.e(TAG, "GL Texture Load Error: " + error); } //Log.d(TAG, "Loaded texture: " + textureName); return true; } } 

Then in my onDrawFrame() method I simply do:

Texture texture = ... gl.glBindTexture(GL10.GL_TEXTURE_2D, texture.texture[0]); ((GL11Ext) gl).glDrawTexfOES((float)(draw_x + 0.5), (float)(draw_y + 0.5), 0, tile_width, tile_height); 

That should get you going with drawing 2D sprites on an openGL canvas. I've noticed that there is really no straightforward tutorial on this. Hopefully in the future I will post one in my dev blog: http://developingthedream.blogspot.com/