private void CreateFramebuffer()
{
AssertNotDisposed();
AssertValidContext();
_graphicsContext.MakeCurrent(null);
int previousRenderbuffer = 0;
_glapi.GetInteger(All.RenderbufferBinding, ref previousRenderbuffer);
_glapi.GenRenderbuffers(1, ref _renderbuffer);
_glapi.BindRenderbuffer(All.Renderbuffer, _renderbuffer);
var ctx = ((IGraphicsContextInternal)_graphicsContext).Implementation as iPhoneOSGraphicsContext;
// TODO: EAGLContext.RenderBufferStorage returns false
// on all but the first call. Nevertheless, it
// works. Still, it would be nice to know why it
// claims to have failed.
ctx.EAGLContext.RenderBufferStorage((uint)All.Renderbuffer, Layer);
_glapi.GenFramebuffers(1, ref _framebuffer);
_glapi.BindFramebuffer(All.Framebuffer, _framebuffer);
_glapi.FramebufferRenderbuffer(
All.Framebuffer, All.ColorAttachment0, All.Renderbuffer, _renderbuffer);
// HACK: GraphicsDevice itself should be calling
// glViewport, so we shouldn't need to do it
// here and then force the state into
// GraphicsDevice. However, that change is a
// ways off, yet.
int unscaledViewportWidth = (int)Math.Round(Layer.Bounds.Size.Width);
int unscaledViewportHeight = (int)Math.Round(Layer.Bounds.Size.Height);
_glapi.Viewport(0, 0, unscaledViewportWidth, unscaledViewportHeight);
_glapi.Scissor(0, 0, unscaledViewportWidth, unscaledViewportHeight);
var gds = (IGraphicsDeviceService)_platform.Game.Services.GetService(
typeof(IGraphicsDeviceService));
if (gds != null && gds.GraphicsDevice != null)
{
gds.GraphicsDevice.Viewport = new Viewport(
0, 0,
(int)(Layer.Bounds.Width * Layer.ContentsScale),
(int)(Layer.Bounds.Height * Layer.ContentsScale));
}
var status = _glapi.CheckFramebufferStatus(All.Framebuffer);
if (status != All.FramebufferComplete)
{
throw new InvalidOperationException(
"Framebuffer was not created correctly: " + status);
}
// FIXME: These static methods on GraphicsDevice need
// to go away someday.
GraphicsDevice.FrameBufferScreen = _framebuffer;
}
