/// <summary>
/// Creates an OpenGL context from a Windows platform.
/// </summary>
/// <returns>
/// A <see cref="IDeviceContext"/> that specify the device context.
/// </returns>
private static IntPtr CreateWinSimpleContext(IDeviceContext rDevice)
{
WindowsDeviceContext winDeviceContext = (WindowsDeviceContext)rDevice;
IntPtr rContext;
// Define most compatible pixel format
Wgl.PIXELFORMATDESCRIPTOR pfd = new Wgl.PIXELFORMATDESCRIPTOR(24);
int pFormat;
bool res;
// Find pixel format match
pfd.dwFlags |= Wgl.PixelFormatDescriptorFlags.DepthDontCare | Wgl.PixelFormatDescriptorFlags.DoublebufferDontCare | Wgl.PixelFormatDescriptorFlags.StereoDontCare;
pFormat = Wgl.ChoosePixelFormat(winDeviceContext.DeviceContext, ref pfd);
Debug.Assert(pFormat != 0);
// Get exact description of the pixel format
res = Wgl.DescribePixelFormat(winDeviceContext.DeviceContext, pFormat, (uint)pfd.nSize, ref pfd);
Debug.Assert(res);
// Set pixel format before creating OpenGL context
res = Wgl.SetPixelFormat(winDeviceContext.DeviceContext, pFormat, ref pfd);
Debug.Assert(res);
// Create a dummy OpenGL context to retrieve initial informations.
rContext = winDeviceContext.CreateContext(IntPtr.Zero);
Debug.Assert(rContext != IntPtr.Zero);
return(rContext);
}
/// <summary>
/// Query the extensions supported by current platform.
/// </summary>
/// <param name="deviceContext">
/// A <see cref="WindowsDeviceContext"/> that specifies the device context to query extensions for.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="deviceContext"/> is null.
/// </exception>
public void Query(WindowsDeviceContext deviceContext)
{
if (deviceContext == null)
throw new ArgumentNullException("deviceContext");
LogComment("Query WGL extensions.");
string wglExtensions = null;
if (Delegates.pwglGetExtensionsStringARB != null) {
wglExtensions = GetExtensionsStringARB(deviceContext.DeviceContext);
} else if (Delegates.pwglGetExtensionsStringEXT != null) {
wglExtensions = GetExtensionsStringEXT();
}
Query(new KhronosVersion(1, 0), wglExtensions ?? String.Empty);
}
/// <summary>
/// Query OpenGL implementation extensions.
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public static GraphicsCapabilities Query(GraphicsContext ctx, IDeviceContext deviceContext)
{
GraphicsCapabilities graphicsCapabilities = new GraphicsCapabilities();
KhronosApi.LogComment("Query OpenGL extensions.");
#region Platform Extension Reload
// Since at this point there's a current OpenGL context, it's possible to use
// {glx|wgl}GetExtensionsString to retrieve platform specific extensions
switch (Environment.OSVersion.Platform)
{
case PlatformID.Win32NT:
case PlatformID.Win32Windows:
case PlatformID.Win32S:
case PlatformID.WinCE:
// Wgl.SyncDelegates();
break;
}
#endregion
// OpenGL extensions
graphicsCapabilities._GlExtensions.Query();
// Windows OpenGL extensions
WindowsDeviceContext windowsDeviceContext = deviceContext as WindowsDeviceContext;
if (windowsDeviceContext != null)
{
graphicsCapabilities._WglExtensions.Query(windowsDeviceContext);
}
// GLX OpenGL extensions
XServerDeviceContext xserverDeviceContext = deviceContext as XServerDeviceContext;
if (xserverDeviceContext != null)
{
graphicsCapabilities._GlxExtensions.Query(xserverDeviceContext);
}
// Query implementation limits
graphicsCapabilities._GraphicsLimits = GraphicsLimits.Query(graphicsCapabilities._GlExtensions);
return(graphicsCapabilities);
}
/// <summary>
/// Query the extensions supported by current platform.
/// </summary>
/// <param name="deviceContext">
/// A <see cref="WindowsDeviceContext"/> that specifies the device context to query extensions for.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="deviceContext"/> is null.
/// </exception>
public void Query(WindowsDeviceContext deviceContext)
{
if (deviceContext == null)
{
throw new ArgumentNullException("deviceContext");
}
LogComment("Query WGL extensions.");
string wglExtensions = null;
if (Delegates.pwglGetExtensionsStringARB != null)
{
wglExtensions = GetExtensionsStringARB(deviceContext.DeviceContext);
}
else if (Delegates.pwglGetExtensionsStringEXT != null)
{
wglExtensions = GetExtensionsStringEXT();
}
Query(Version_100, wglExtensions ?? String.Empty);
}
