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POSystem.Exception when running MonoMac Samples that use OpenGL
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  1. POSystem.Exception when running MonoMac Samples that use OpenGL
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    copied!<p>This is my first post to stackOverflow so I hope you are kind to me :). After setting up my system with XCode v4.4, MonoDevelop v3.0.5 and the latest development branch from MonoMac (v2.10.9) git hub I keep getting these exceptions when running the MonoMac samples that include OpenGL any other samples work as expected. Here is a stack trace of the exception:-</p> <pre><code>2012-08-27 15:23:17.117 NeHeLesson1[229:1207] invalid pixel format 2012-08-27 15:23:17.119 NeHeLesson1[229:1207] invalid context Unhandled Exception: System.Exception: Invalid parameters to context creation at MonoMac.OpenGL.CGLContext..ctor (intptr) &lt;0x0006f&gt; at MonoMac.AppKit.NSOpenGLContext.get_CGLContext () &lt;0x00053&gt; at NeHeLesson1.MyOpenGLView.SetupDisplayLink () &lt;0x00089&gt; at NeHeLesson1.MyOpenGLView..ctor (System.Drawing.RectangleF,MonoMac.AppKit.NSOpenGLContext) &lt;0x00283&gt; at NeHeLesson1.MyOpenGLView..ctor (System.Drawing.RectangleF) &lt;0x00033&gt; at (wrapper dynamic-method) object.ee521f2b-bbc7-4e1d-ad69-1022ce59ef12 (intptr,MonoMac.ObjCRuntime.Selector,System.Drawing.RectangleF) &lt;0x00077&gt; at (wrapper native-to-managed) object.ee521f2b-bbc7-4e1d-ad69-1022ce59ef12 (intptr,MonoMac.ObjCRuntime.Selector,System.Drawing.RectangleF) &lt;0x0008f&gt; at (wrapper managed-to-native) MonoMac.ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper (intptr,intptr) &lt;0x00003&gt; at MonoMac.AppKit.NSWindowController.get_Window () &lt;0x0007b&gt; at NeHeLesson1.MainWindowController.get_Window () &lt;0x00013&gt; at NeHeLesson1.AppDelegate.FinishedLaunching (MonoMac.Foundation.NSObject) &lt;0x0003b&gt; at (wrapper dynamic-method) object.[NeHeLesson1.AppDelegate.Void FinishedLaunching(MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject) &lt;0x00033&gt; at (wrapper native-to-managed) object.[NeHeLesson1.AppDelegate.Void FinishedLaunching(MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject) &lt;0x000fb&gt; at (wrapper managed-to-native) MonoMac.AppKit.NSApplication.NSApplicationMain (int,string[]) &lt;0x00003&gt; at MonoMac.AppKit.NSApplication.Main (string[]) &lt;0x00017&gt; at NeHeLesson1.MainClass.Main (string[]) &lt;0x00017&gt; [ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Invalid parameters to context creation at MonoMac.OpenGL.CGLContext..ctor (intptr) &lt;0x0006f&gt; at MonoMac.AppKit.NSOpenGLContext.get_CGLContext () &lt;0x00053&gt; at NeHeLesson1.MyOpenGLView.SetupDisplayLink () &lt;0x00089&gt; at NeHeLesson1.MyOpenGLView..ctor (System.Drawing.RectangleF,MonoMac.AppKit.NSOpenGLContext) &lt;0x00283&gt; at NeHeLesson1.MyOpenGLView..ctor (System.Drawing.RectangleF) &lt;0x00033&gt; at (wrapper dynamic-method) object.ee521f2b-bbc7-4e1d-ad69-1022ce59ef12 (intptr,MonoMac.ObjCRuntime.Selector,System.Drawing.RectangleF) &lt;0x00077&gt; at (wrapper native-to-managed) object.ee521f2b-bbc7-4e1d-ad69-1022ce59ef12 (intptr,MonoMac.ObjCRuntime.Selector,System.Drawing.RectangleF) &lt;0x0008f&gt; at (wrapper managed-to-native) MonoMac.ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper (intptr,intptr) &lt;0x00003&gt; at MonoMac.AppKit.NSWindowController.get_Window () &lt;0x0007b&gt; at NeHeLesson1.MainWindowController.get_Window () &lt;0x00013&gt; at NeHeLesson1.AppDelegate.FinishedLaunching (MonoMac.Foundation.NSObject) &lt;0x0003b&gt; at (wrapper dynamic-method) object.[NeHeLesson1.AppDelegate.Void FinishedLaunching(MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject) &lt;0x00033&gt; at (wrapper native-to-managed) object.[NeHeLesson1.AppDelegate.Void FinishedLaunching(MonoMac.Foundation.NSObject)] (MonoMac.Foundation.NSObject,MonoMac.ObjCRuntime.Selector,MonoMac.Foundation.NSObject) &lt;0x000fb&gt; at (wrapper managed-to-native) MonoMac.AppKit.NSApplication.NSApplicationMain (int,string[]) &lt;0x00003&gt; at MonoMac.AppKit.NSApplication.Main (string[]) &lt;0x00017&gt; at NeHeLesson1.MainClass.Main (string[]) &lt;0x00017&gt; </code></pre> <p>The code that is causing the error is:-</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Drawing; using MonoMac.Foundation; using MonoMac.AppKit; using MonoMac.CoreVideo; using MonoMac.CoreGraphics; using MonoMac.OpenGL; namespace NeHeLesson1 { public partial class MyOpenGLView : MonoMac.AppKit.NSView { NSOpenGLContext openGLContext; NSOpenGLPixelFormat pixelFormat; MainWindowController controller; CVDisplayLink displayLink; NSObject notificationProxy; [Export("initWithFrame:")] public MyOpenGLView (RectangleF frame) : this(frame, null) { } public MyOpenGLView (RectangleF frame, NSOpenGLContext context) : base(frame) { var attribs = new object [] { NSOpenGLPixelFormatAttribute.Accelerated, NSOpenGLPixelFormatAttribute.NoRecovery, NSOpenGLPixelFormatAttribute.DoubleBuffer, NSOpenGLPixelFormatAttribute.ColorSize, 24, NSOpenGLPixelFormatAttribute.DepthSize, 16 }; pixelFormat = new NSOpenGLPixelFormat (attribs); if (pixelFormat == null) Console.WriteLine ("No OpenGL pixel format"); // NSOpenGLView does not handle context sharing, so we draw to a custom NSView instead openGLContext = new NSOpenGLContext (pixelFormat, context); openGLContext.MakeCurrentContext (); // Synchronize buffer swaps with vertical refresh rate openGLContext.SwapInterval = true; // Initialize our newly created view. InitGL (); SetupDisplayLink(); // Look for changes in view size // Note, -reshape will not be called automatically on size changes because NSView does not export it to override notificationProxy = NSNotificationCenter.DefaultCenter.AddObserver (NSView.NSViewGlobalFrameDidChangeNotification, HandleReshape); } public override void DrawRect (RectangleF dirtyRect) { // Ignore if the display link is still running if (!displayLink.IsRunning &amp;&amp; controller != null) DrawView (); } public override bool AcceptsFirstResponder () { // We want this view to be able to receive key events return true; } public override void LockFocus () { base.LockFocus (); if (openGLContext.View != this) openGLContext.View = this; } public override void KeyDown (NSEvent theEvent) { controller.KeyDown (theEvent); } public override void MouseDown (NSEvent theEvent) { controller.MouseDown (theEvent); } // All Setup For OpenGL Goes Here public bool InitGL () { // Enables Smooth Shading GL.ShadeModel (ShadingModel.Smooth); // Set background color to black GL.ClearColor (Color.Black); // Setup Depth Testing // Depth Buffer setup GL.ClearDepth (1.0); // Enables Depth testing GL.Enable (EnableCap.DepthTest); // The type of depth testing to do GL.DepthFunc (DepthFunction.Lequal); // Really Nice Perspective Calculations GL.Hint (HintTarget.PerspectiveCorrectionHint, HintMode.Nicest); return true; } private void DrawView () { // This method will be called on both the main thread (through -drawRect:) and a secondary thread (through the display link rendering loop) // Also, when resizing the view, -reshape is called on the main thread, but we may be drawing on a secondary thread // Add a mutex around to avoid the threads accessing the context simultaneously openGLContext.CGLContext.Lock (); // Make sure we draw to the right context openGLContext.MakeCurrentContext (); // Delegate to the scene object for rendering controller.Scene.DrawGLScene (); openGLContext.FlushBuffer (); openGLContext.CGLContext.Unlock (); } private void SetupDisplayLink () { // Create a display link capable of being used with all active displays displayLink = new CVDisplayLink (); // Set the renderer output callback function displayLink.SetOutputCallback (MyDisplayLinkOutputCallback); // Set the display link for the current renderer CGLContext cglContext = openGLContext.CGLContext; CGLPixelFormat cglPixelFormat = PixelFormat.CGLPixelFormat; displayLink.SetCurrentDisplay (cglContext, cglPixelFormat); } public CVReturn MyDisplayLinkOutputCallback (CVDisplayLink displayLink, ref CVTimeStamp inNow, ref CVTimeStamp inOutputTime, CVOptionFlags flagsIn, ref CVOptionFlags flagsOut) { CVReturn result = GetFrameForTime (inOutputTime); return result; } private CVReturn GetFrameForTime (CVTimeStamp outputTime) { // There is no autorelease pool when this method is called because it will be called from a background thread // It's important to create one or you will leak objects using (NSAutoreleasePool pool = new NSAutoreleasePool ()) { // Update the animation DrawView (); } return CVReturn.Success; } public NSOpenGLContext OpenGLContext { get { return openGLContext; } } public NSOpenGLPixelFormat PixelFormat { get { return pixelFormat; } } public MainWindowController MainController { set { controller = value; } } public void UpdateView () { // This method will be called on the main thread when resizing, but we may be drawing on a secondary thread through the display link // Add a mutex around to avoid the threads accessing the context simultaneously openGLContext.CGLContext.Lock (); // Delegate to the scene object to update for a change in the view size controller.Scene.ResizeGLScene (Bounds); openGLContext.Update (); openGLContext.CGLContext.Unlock (); } private void HandleReshape (NSNotification note) { UpdateView (); } public void StartAnimation () { if (displayLink != null &amp;&amp; !displayLink.IsRunning) displayLink.Start (); } public void StopAnimation () { if (displayLink != null &amp;&amp; displayLink.IsRunning) displayLink.Stop (); } // Clean up the notifications public void DeAllocate() { displayLink.Stop(); displayLink.SetOutputCallback(null); NSNotificationCenter.DefaultCenter.RemoveObserver(notificationProxy); } [Export("toggleFullScreen:")] public void toggleFullScreen (NSObject sender) { controller.toggleFullScreen (sender); } } } </code></pre> <p>scene.cs</p> <pre><code>namespace NeHeLesson1 { public class Scene : NSObject { public Scene () : base() { } // Resize And Initialize The GL Window // - See also the method in the MyOpenGLView Constructor about the NSView.NSViewGlobalFrameDidChangeNotification public void ResizeGLScene (RectangleF bounds) { // Reset The Current Viewport GL.Viewport (0, 0, (int)bounds.Size.Width, (int)bounds.Size.Height); // Select The Projection Matrix GL.MatrixMode (MatrixMode.Projection); // Reset The Projection Matrix GL.LoadIdentity (); // Set perspective here - Calculate The Aspect Ratio Of The Window Perspective (45, bounds.Size.Width / bounds.Size.Height, 0.1, 100); // Select The Modelview Matrix GL.MatrixMode (MatrixMode.Modelview); // Reset The Modelview Matrix GL.LoadIdentity (); } // This creates a symmetric frustum. // It converts to 6 params (l, r, b, t, n, f) for glFrustum() // from given 4 params (fovy, aspect, near, far) public static void Perspective (double fovY, double aspectRatio, double front, double back) { const double DEG2RAD = Math.PI / 180; // tangent of half fovY double tangent = Math.Tan (fovY / 2 * DEG2RAD); // half height of near plane double height = front * tangent; // half width of near plane double width = height * aspectRatio; // params: left, right, bottom, top, near, far GL.Frustum (-width, width, -height, height, front, back); } // This method renders our scene and where all of your drawing code will go. // The main thing to note is that we've factored the drawing code out of the NSView subclass so that // the full-screen and non-fullscreen views share the same states for rendering public bool DrawGLScene () { // Clear The Screen And The Depth Buffer GL.Clear (ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit); // Reset The Current Modelview Matrix GL.LoadIdentity (); return true; } } } </code></pre> <p>Hope someone can help me with this issue as its stopping from running MonoMac and MonoGameFrameWork, am i missing something from my setup. BTW I was able to run all OpenGLExtentions Viewer tests so I openGL seems to work.</p> <p>Jase</p>
 

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