C# IDeviceContext.IncRef方法代码示例

		/// <summary>
		/// Construct a GraphicsContext specifying the implemented OpenGL version.
		/// </summary>
		/// <param name="deviceContext">
		/// A <see cref="IDeviceContext"/> that specify the device context which has to be linked this
		/// this Render context.
		/// </param>
		/// <param name="sharedContext">
		/// A <see cref="GraphicsContext"/> that specify the render context which has to be linked this
		/// this Render context (to share resource with it).
		/// </param>
		/// <param name="version">
		/// A <see cref="KhronosVersion"/> that specify the minimum OpenGL version required to implement.
		/// </param>
		/// <param name="flags">
		/// A <see cref="GraphicsContextFlags"/> that specify special features to enable in the case they are supported.
		/// </param>
		/// <exception cref="ArgumentException">
		/// Exception thrown in the case <paramref name="version"/> is different from the currently implemented by the derive,
		/// and the OpenGL extension WGL_ARB_create_context_profile or WGL_ARB_create_context are not implemented.
		/// </exception>
		/// <exception cref="ArgumentException">
		/// This exception is thrown in the case <paramref name="version"/> specify a forward compatible version (greater than or equal to
		/// <see cref="GLVersion.Version_3_2"/>), and the OpenGL extension WGL_ARB_create_context_profile or WGL_ARB_create_context
		/// are not implemented.
		/// </exception>
		/// <exception cref="ArgumentException">
		/// This exception is thrown in the case <paramref name="devctx"/> is <see cref="IntPtr.Zero"/>.
		/// </exception>
		/// <exception cref="InvalidOperationException">
		/// This exception is thrown in the case it's not possible to create a valid OpenGL context.
		/// </exception>
		/// <exception cref="ArgumentException">
		/// This exception is thrown if <paramref name="sharedContext"/> is not null and it was created by a thread different from the calling one.
		/// </exception>
		/// <exception cref="ArgumentException">
		/// This exception is thrown if <paramref name="sharedContext"/> is not null and it is disposed.
		/// </exception>
		public GraphicsContext(IDeviceContext deviceContext, GraphicsContext sharedContext, KhronosVersion version, GraphicsContextFlags flags)
		{
			try {
				IntPtr sharedContextHandle = (sharedContext != null) ? sharedContext._RenderContext : IntPtr.Zero;

#if DEBUG
				_ConstructorStackTrace = Environment.StackTrace;
#endif

				// Store thread ID of the render context
				_RenderContextThreadId = System.Threading.Thread.CurrentThread.ManagedThreadId;
				// Store thread ID of the device context
				_DeviceContextThreadId = System.Threading.Thread.CurrentThread.ManagedThreadId;

				if (deviceContext == null)
					throw new ArgumentNullException("deviceContext");
				if ((sharedContext != null) && (sharedContext._DeviceContext == null))
					throw new ArgumentException("shared context disposed", "hSharedContext");
				if ((sharedContext != null) && (sharedContext._RenderContextThreadId != _RenderContextThreadId))
					throw new ArgumentException("shared context created from another thread", "hSharedContext");
				if ((version != null) && (version != _CurrentVersion) && ((CurrentCaps.PlatformExtensions.CreateContext_ARB == false) && (CurrentCaps.PlatformExtensions.CreateContextProfile_ARB == false)))
					throw new ArgumentException("unable to specify OpenGL version when GL_ARB_create_context[_profile] is not supported");

				// Store device context handle
				_DeviceContext = deviceContext;
				_DeviceContext.IncRef();

				// Allow version to be null (fallback to current version)
				version = version ?? _CurrentVersion;
				// Set flags
				_ContextFlags = flags;

				if ((CurrentCaps.PlatformExtensions.CreateContext_ARB || CurrentCaps.PlatformExtensions.CreateContextProfile_ARB) && (version.Major >= 3)) {
					List<int> cAttributes = new List<int>();

					#region Context Version

					// Requires a specific version
					Debug.Assert(Wgl.CONTEXT_MAJOR_VERSION_ARB == Glx.CONTEXT_MAJOR_VERSION_ARB);
					Debug.Assert(Wgl.CONTEXT_MINOR_VERSION_ARB == Glx.CONTEXT_MINOR_VERSION_ARB);
					cAttributes.AddRange(new int[] {
						Wgl.CONTEXT_MAJOR_VERSION_ARB, version.Major,
						Wgl.CONTEXT_MINOR_VERSION_ARB, version.Minor
					});

					#endregion

					#region Context Profile

					uint contextProfile = 0;

					// Check binary compatibility between WGL and GLX
					Debug.Assert(Wgl.CONTEXT_PROFILE_MASK_ARB == Glx.CONTEXT_PROFILE_MASK_ARB);
					Debug.Assert(Wgl.CONTEXT_CORE_PROFILE_BIT_ARB == Glx.CONTEXT_CORE_PROFILE_BIT_ARB);
					Debug.Assert(Wgl.CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB == Glx.CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB);
					Debug.Assert(Wgl.CONTEXT_ES_PROFILE_BIT_EXT == Glx.CONTEXT_ES_PROFILE_BIT_EXT);

					// By default, Core profile

					// Core profile?
					if ((flags & GraphicsContextFlags.CoreProfile) != 0)
						contextProfile |= Wgl.CONTEXT_CORE_PROFILE_BIT_ARB;
//.........这里部分代码省略.........