I tried removing that line but I get the same crash...

I get this problem both on my Galaxy Nexus and on my tablet (with 4.0.3).

The tablet throws this error to LogCat constantly (although it seems to be working exactly the same as the nexus):

01-21 17:29:29.409: E/SurfaceTexture(2074): [unnamed-2074-3] dequeueBuffer: no available buffer slots

It says depth size is 24.

The Config chooser is saying my depth buffer size is 16 so I guess it's activated.

The objects themselves shouldn't have any transparency, they load nicely in the helloworld demo. Anyway I tried setting it to -1 as you said, but it changed nothing...

Those sound like promising approaches. I will try them, thanks!

I was thinking of doing something similar to this:

https://www.youtube.com/watch?v=dUBxHd3bMhg (from 1:25)

And maybe this is a very stupid and simple question, but how would you restrict the rendering to that specific area? I know Portal rendering has something to do with this but I think it isn't included in JPCT-AE and it's not really that used anymore.

Is it possible to achieve something like this with jpct-ae?

Yes, that was it. Thanks!

Is it possible to make the background transparent? Using a RGBA color when calling clear() does not do it.

I know there are a few posts regarding this integration already, but they are all of a point much more advanced that the one I am

I am trying to integrate the basic ImageTargets from Vuforia with JPCT-AE's simple HelloWorld demo, but I am facing some problems.

First I started from Vuforia's code, using their extension of GlSurfaceView. Then on ImageRendered I pasted the code from JPCT's hello world, like this:

public ImageTargetsRenderer(ImageTargets activity) {

this.mActivity = activity;

world = new World();
world.setAmbientLight(20, 20, 20);
sun = new Light(world);
sun.setIntensity(250, 250, 250);

// Create a texture out of the icon...:-)
Texture texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(mActivity.getResources().getDrawable(R.drawable.ic_launcher)), 64, 64));
TextureManager.getInstance().addTexture("texture", texture);

cube = Primitives.getCube(10);
cube.calcTextureWrapSpherical();
cube.setTexture("texture");
cube.strip();
cube.build();

world.addObject(cube);

Camera cam = world.getCamera();
cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);
cam.lookAt(cube.getTransformedCenter());

SimpleVector sv = new SimpleVector();
sv.set(cube.getTransformedCenter());
sv.y -= 100;
sv.z -= 100;
sun.setPosition(sv);
MemoryHelper.compact();
}

/** Called when the surface is created or recreated. */
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
DebugLog.LOGD("GLRenderer::onSurfaceCreated");

// Call native function to initialize rendering:
initRendering();

// Call QCAR function to (re)initialize rendering after first use
// or after OpenGL ES context was lost (e.g. after onPause/onResume):
QCAR.onSurfaceCreated();
}

/** Called when the surface changed size. */
public void onSurfaceChanged(GL10 gl, int width, int height) {
DebugLog.LOGD("GLRenderer::onSurfaceChanged");

// Call native function to update rendering when render surface
// parameters have changed:
updateRendering(width, height);

// Call QCAR function to handle render surface size changes:
QCAR.onSurfaceChanged(width, height);

if (fb != null) {
fb.dispose();
}
fb = new FrameBuffer(gl, width, height);

}

/** The native render function. */
public native void renderFrame();

/** Called to draw the current frame. */
public void onDrawFrame(GL10 gl) {

fb.clear(back);
world.renderScene(fb);
world.draw(fb);
fb.display();

if (!mIsActive)
return;

// Update render view (projection matrix and viewport) if needed:
mActivity.updateRenderView();
// Call our native function to render content
renderFrame();

}:
But when I launch my app I get an ArrayIndexOutOfBounds error on the world.renderScene method. If I comment vuforia's mGlView.init() code:

public void init(int flags, boolean translucent, int depth, int stencil) {
// By default GLSurfaceView tries to find a surface that is as close
// as possible to a 16-bit RGB frame buffer with a 16-bit depth buffer.
// This function can override the default values and set custom values.

// Extract OpenGL ES version from flags
mUseOpenGLES2 = (flags & QCAR.GL_20) != 0;

// By default, GLSurfaceView() creates a RGB_565 opaque surface.
// If we want a translucent one, we should change the surface's
// format here, using PixelFormat.TRANSLUCENT for GL Surfaces
// is interpreted as any 32-bit surface with alpha by SurfaceFlinger.

DebugLog.LOGI("Using OpenGL ES " + (mUseOpenGLES2 ? "2.0" : "1.x"));
DebugLog.LOGI("Using " + (translucent ? "translucent" : "opaque") + " GLView, depth buffer size: " + depth + ", stencil size: " + stencil);

// If required set translucent format to allow camera image to
// show through in the background
if (translucent) {
this.getHolder().setFormat(PixelFormat.TRANSLUCENT);
}
// Setup the context factory for 1.x / 2.0 rendering
setEGLContextFactory(new ContextFactory());

// We need to choose an EGLConfig that matches the format of
// our surface exactly. This is going to be done in our
// custom config chooser. See ConfigChooser class definition
// below.
setEGLConfigChooser(translucent ? new ConfigChooser(8, 8, 8, 8, depth, stencil) : new ConfigChooser(5, 6, 5, 0, depth, stencil));

}

/** Creates OpenGL contexts. */
private static class ContextFactory implements GLSurfaceView.EGLContextFactory {
private static int EGL_CONTEXT_CLIENT_VERSION = 0x3098;

public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
EGLContext context;
if (mUseOpenGLES2) {
DebugLog.LOGI("Creating OpenGL ES 2.0 context");
checkEglError("Before eglCreateContext", egl);
int[] attrib_list_gl20 = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL10.EGL_NONE };
context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list_gl20);
} else {
DebugLog.LOGI("Creating OpenGL ES 1.x context");
checkEglError("Before eglCreateContext", egl);
int[] attrib_list_gl1x = { EGL_CONTEXT_CLIENT_VERSION, 1, EGL10.EGL_NONE };
context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list_gl1x);
}

checkEglError("After eglCreateContext", egl);
return context;
}

public void destroyContext(EGL10 egl, EGLDisplay display, EGLContext context) {
egl.eglDestroyContext(display, context);
}
}
Then my app runs but I get "called unimplemented OpenGL ES API" errors constnatly.

Am I approaching anything badly here?