public void MakeCurrent()
{
if (!EAGLContext.SetCurrentContext(mgleaglContext))
{
throw new InvalidOperationException("Unable to change current EAGLContext.");
}
GLHelper.CheckGLErrors();
}
private void CreateFramebuffer()
{
if (framebuffer != 0)
{
return;
}
MakeCurrent();
framebuffer = GL.GenFramebuffer();
GL.BindFramebuffer(FramebufferTarget.Framebuffer, framebuffer);
GLHelper.CheckGLErrors();
colorRenderbuffer = GL.GenRenderbuffer();
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, colorRenderbuffer);
GLHelper.CheckGLErrors();
var eaglLayer = (CAEAGLLayer)Layer;
if (!mgleaglContext.RenderBufferStorage((uint)RenderbufferTarget.Renderbuffer, eaglLayer))
{
Logger.Write("Failed to bind render buffer with error: {0}", GL.GetErrorCode());
//throw new InvalidOperationException("EAGLContext.RenderBufferStorage() failed");
}
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.ColorAttachment0, RenderbufferTarget.Renderbuffer, colorRenderbuffer);
GL.Viewport(0, 0, (int)ClientSize.X, (int)ClientSize.Y);
GL.Scissor(0, 0, (int)ClientSize.X, (int)ClientSize.Y);
GLHelper.CheckGLErrors();
// Create a depth renderbuffer
depthRenderbuffer = GL.GenRenderbuffer();
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, depthRenderbuffer);
// Allocate storage for the new renderbuffer
var scale = (float)UIScreen.MainScreen.Scale;
GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, (RenderbufferInternalFormat)All.Depth24Stencil8Oes,
(int)(ClientSize.X * scale), (int)(ClientSize.Y * scale));
// Attach the renderbuffer to the framebuffer's depth attachment point
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.DepthAttachment, RenderbufferTarget.Renderbuffer, depthRenderbuffer);
// Attach the renderbuffer to the framebuffer's stencil attachment point
GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferSlot.StencilAttachment, RenderbufferTarget.Renderbuffer, depthRenderbuffer);
GL.ClearStencil(0);
GL.ClearDepth(1.0f);
GL.DepthFunc(DepthFunction.Lequal);
GLHelper.CheckGLErrors();
}
private void DestroyFramebuffer()
{
if (framebuffer == 0)
{
return;
}
MakeCurrent();
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, 0);
GL.DeleteRenderbuffer(colorRenderbuffer);
GL.DeleteRenderbuffer(depthRenderbuffer);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
GL.DeleteFramebuffer(framebuffer);
GLHelper.CheckGLErrors();
colorRenderbuffer = 0;
depthRenderbuffer = 0;
framebuffer = 0;
EAGLContext.SetCurrentContext(null);
}