[mono-android] Initializing depth buffer for OpenGL 2.0 ES in MonoDroid

[Jain Ankit]

The next release will have a fix for this.

-Ankit

>>> Kestutis Tauckela  03/17/11 2:58 AM >>>
I've found following on the web:
http://www.mail-archive.com/mono-bugs@lists.ximian.com/msg81676.html

Do I understand correctly that this bug is still open and there is almost no one who managed to enable depth buffer using MonoDroid!
I'm *shocked*.

Kestutis Tauckela
http://www.outlanderstudios.com

On Tue, Mar 15, 2011 at 11:03 PM, Kestutis Tauckela <kestutis.tauckela at gmail.com> wrote:
Hi,

I would like to use MonoDroid/OpenGL 2.0 ES with depth buffer. From what I've learned I need to override 'protected override void CreateFrameBuffer()' in my child class of AndroidGameView class. In that function, calling 'GLContextVersion = GLContextVersion.Gles2_0;' and 'base.CreateFrameBuffer();' will init frame buffer, render buffer and graphics context. The problem is that there is no depth buffer. All my attempts to attach a depth buffer failed. I was looking at MonoTouch, WebGL examples and some OpenGL ES websites - with no success. My attempts to create frame buffer from scratch failed even more spectacularly as I could not create graphics context and no information on the web as to where or how to get WindowInfo class.

Does anyone know any working example of MonoDroid OpenGL 2.0 ES with depth buffer? Or maybe you could hint me how to init it properly.

Here are my attempts:

// 1. Working OpenGL 2.0 ES, but no depth buffer code. No fall back to 1.X as I don't need that.
protected override void CreateFrameBuffer()
{
    GLContextVersion = GLContextVersion.Gles2_0;
    base.CreateFrameBuffer();
}

// 2. Failed attempt to attach depth buffer:
protected override void CreateFrameBuffer()
{
    GLContextVersion = GLContextVersion.Gles2_0;
    base.CreateFrameBuffer();

    int nDepthBufferID = -1;
    GL.GenRenderbuffers(1, ref nDepthBufferID);
    GL.BindRenderbuffer(All.Renderbuffer, nDepthBufferID);
    GL.RenderbufferStorage(All.Renderbuffer, All.DepthComponent16, 800, 480);    // <- Don't know where to get real size from.
    GL.FramebufferRenderbuffer(All.Framebuffer, All.DepthAttachment, All.Renderbuffer, nDepthBufferID);    // Does not work if Framebuffer is bound to 0.
}

// 3. Failed attempt to create frame buffer from cratch:
protected override void CreateFrameBuffer()
{
    GLContextVersion = GLContextVersion.Gles2_0;

    int nFrameBufferID = -1;
    GL.GenFramebuffers(1, ref nFrameBufferID);
    GL.BindFramebuffer(All.Framebuffer, nFrameBufferID);

    int nViewBufferID = -1;
    GL.GenRenderbuffers(1, ref nViewBufferID);
    GL.BindRenderbuffer(All.Renderbuffer, nViewBufferID);
    GL.RenderbufferStorage(All.Renderbuffer, All.Rgb565, 800, 480);    // <- Don't know where to get real size from.

    int nDepthBufferID = -1;
    GL.GenRenderbuffers(1, ref nDepthBufferID);
    GL.BindRenderbuffer(All.Renderbuffer, nDepthBufferID);
    GL.RenderbufferStorage(All.Renderbuffer, All.DepthComponent16, 800, 480);    // <- Don't know where to get real size from.
    GL.FramebufferRenderbuffer(All.Framebuffer, All.DepthAttachment, All.Renderbuffer, nDepthBufferID);    // Works as frame buffer is not 0.

    Log.Info("Example", string.Format("Frame buffer status: {0}", GL.CheckFramebufferStatus(All.Framebuffer).ToString()));  // <- All good here, but it will crash on my attempt to render.
}

Thanks,
Kestutis Tauckela
http://www.outlanderstudios.com




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