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emacinnes's picture

Linux/MacOSX running OpenTK

Posted Friday, 26 March, 2010 - 17:41 by emacinnes
Project:The Open Toolkit library
Version:1.x-dev
Component:Code
Category:bug report
Priority:normal
Assigned:Unassigned
Status:closed
Description

I'm getting to the bottom of the MacOSX issue on VMWare. It also occurs on Linux (Fedora F10) also through VMWare, the basic problem is that here a 32 bit depth buffer isn't available, only 16 bit, and no AA samples. so the Default values aren't going to make it work here. There are other issues, by hardcoding the display type though I can at least get past this bit.

Euan

Icarus Scene Engine. OpenTK-based 3D simulation & games solution:
http://www.pointscape.com.sg/joomla

See Icarus videos on YouTube at:
http://www.youtube.com/user/emacinnes


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the Fiddler's picture

#1

Posted Friday, 26 March, 2010 - 19:01 by the Fiddler

That's strange. The default mode requests a 16bit depth buffer and no AA precisely because for compatibility reasons. From Source/OpenTK/Graphics/GraphicsMode.cs

        public static GraphicsMode Default
        {
            get
            {
                lock (SyncRoot)
                {
                    if (defaultMode == null)
                    {
                        Debug.Print("Creating default GraphicsMode ({0}, {1}, {2}, {3}, {4}, {5}, {6}).", DisplayDevice.Default.BitsPerPixel,
                                    16, 0, 0, 0, 2, false);
                        defaultMode = new GraphicsMode(DisplayDevice.Default.BitsPerPixel, 16, 0, 0, 0, 2, false);
                    }
                    return defaultMode;
                }
            }
        }

Edit: aha, it seems that MacOSGraphicsMode hardcodes the mode with id 1 no matter what you request.

        public GraphicsMode SelectGraphicsMode(ColorFormat color, int depth, int stencil, int samples, ColorFormat accum, int buffers, bool stereo)
        {
            GraphicsMode gfx = new GraphicsMode((IntPtr)1, color, depth, stencil, samples,
                                                 accum, buffers, stereo);
 
            System.Diagnostics.Debug.Print("Created dummy graphics mode.");
 
            return gfx;
        }

This needs to be fixed.

However, this doesn't explain why X11GraphicsMode selects an incompatible mode. (The driver shouldn't do that, in theory).

the Fiddler's picture

#2

Posted Wednesday, 24 November, 2010 - 00:59 by the Fiddler
Status:open» closed

The Mac issue (#1679: GraphicsMode returns hardcoded mode on Mac OS X) is now fixed.

I cannot reproduce the Linux issue on VirtualBox but please reopen if it still occurs.