Post Processing Black Screen about rajawali HOT 10 CLOSED

I'll try to get a Xoom to see what's going on. Have to figure out where to get it though :-) Will keep you posted.

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One more detail on the Xoom. On startup with the sepiafilter applied there appears to be 1 frame rendered with black artifacts similar to the Wildfire (but fullscreen instead of half screen). But since it is only 1 frame the next frames are 100% black.

An alternative to you buying stuff could perhaps be for me to learn more about whats going on and fixing it myself, is there any documentation I can read that will make me understand a bit more about this kind of post process rendering?

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I can borrow a Xoom from one of my colleagues. He's going to bring it in tomorrow :-)

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Oh, cool :)

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Yes, maybe you can look at it in the meantime. Post processing basically works like this:
The whole scene is rendered into a texture. A frame buffer object (FBO) is used for this. (see src/rajawali/renderer/PostProcessingRenderer.java)
When the whole scene is rendered into this texture it will be displayed on a screen quad using your Camera2D class.

The last fix I did was setting the size of the framebuffer to the nearest power of two size. For performance reasons, I set it to the power of two size that's smaller than the current screen size. You might want to check if something is going wrong there.

Let me know if you need more info.

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Thanks :).
Looking at it a bit now, one interesting thing is that the Rajawali Example app (that I got from from google play) with the swirling monkey example works on the xoom. But when I use this.addPostProcessingFilter(new SwirlFilter(mViewportWidth, mViewportHeight, 10, 1f)); in my app (at the end of initScene) I get the previously mentioned black screen. So perhaps this might just be me doing something very wrong. Anyways, looking into it.

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A small update:

I have tried creating a very tiny example project (just a simple sphere with a texture) as a normal app and a live wallpaper and applied the sepia filter and it works just fine on the Xoom. The problem I am describing here apparently has something to do with something I am doing in the project that can be seen in the above screenshot from my wildfire so I shall need to do some more bug hunting :)

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Aha! Found a bug here!

Transparency is apparently not compatible with post processing.

public void initScene() {
    SimpleMaterial mat = new SimpleMaterial();
    Bitmap bg = BitmapFactory.decodeResource(mContext.getResources(), R.raw.clouds512);
    Sphere sphere = new Sphere(1, 12, 12);
    sphere.addTexture(mTextureManager.addTexture(bg));
    sphere.setMaterial(mat);
    addChild(sphere);
    BaseObject3D sphere2 = sphere.clone();
    sphere2.setX(1.0f);
    //sphere2.setTransparent(true); <------ evil!!!!!!!!!!!!!!!!!!!!!!
    addChild(sphere2);


    SepiaFilter sepiaFilter = new SepiaFilter();
    this.addPostProcessingFilter(sepiaFilter);

    mCamera.setZ(-4.2f);
    startRendering();
}

uncomment the sphere2.setTransparent(true); line and the Xoom shows a black screen, comment it and it shows two spheres in sepia color.

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Good find! I'll see if I can fix this tomorrow.

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Yay, it works now, both on my wildfire and my xoom. Thanks :)

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