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

[Kestutis Tauckela]

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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