private wglGetProcAddress ( string name ) : IntPtr | ||
name | string | |
return | IntPtr |
private static T GetDelegateFor <T>() where T : class { // Get the type of the extension function. Type delegateType = typeof(T); // Get the name of the extension function. string name = delegateType.Name; // ftlPhysicsGuy - Better way Delegate del = null; if (!extensionFunctions.TryGetValue(name, out del)) { // check https://www.opengl.org/wiki/Load_OpenGL_Functions IntPtr proc = Win32.wglGetProcAddress(name); int pointer = proc.ToInt32(); if (-1 <= pointer && pointer <= 3) { proc = Win32.GetProcAddress(name); pointer = proc.ToInt32(); if (-1 <= pointer && pointer <= 3) { throw new Exception("Extension function " + name + " not supported"); } } // Get the delegate for the function pointer. del = Marshal.GetDelegateForFunctionPointer(proc, delegateType); // Add to the dictionary. extensionFunctions.Add(name, del); } return(del as T); }
// https://msdn.microsoft.com/zh-cn/library/ms379564(VS.80).aspx // 如果客户端指定引用类型,则 JIT 编译器将服务器 IL 中的一般参数替换为 Object,并将其编译为本机代码。 // 在以后的任何针对引用类型而不是一般类型参数的请求中,都将使用该代码。 // 请注意,采用这种方式,JIT 编译器只会重新使用实际代码。实例仍然按照它们离开托管堆的大小分配空间,并且没有强制类型转换。 // // http://blog.csdn.net/yjjm1990/article/details/9498923 // CLR 为所有类型参数为“ 引用类型” 的泛型类型产生同一份代码;但如果类型参数为“ 值类型” ,对每一个不同的“ 值类型” ,CLR将为其产生一份独立的代码 // /// <summary> /// Returns a delegate for an extension function. This delegate can be called to execute the extension function. /// </summary> /// <typeparam name="T">The extension delegate type.</typeparam> /// <returns>The delegate that points to the extension function.</returns> //[MethodImpl(MethodImplOptions.AggressiveInlining)] public static T GetDelegateFor <T>() where T : class { // Get the type of the extension function. Type delegateType = typeof(T); // Get the name of the extension function. string name = delegateType.Name; // ftlPhysicsGuy - Better way Delegate del = null; if (!extensionFunctions.TryGetValue(name, out del)) { IntPtr proc = IntPtr.Zero; if (CurrentOS.IsWindows) { // check https://www.opengl.org/wiki/Load_OpenGL_Functions proc = Win32.wglGetProcAddress(name); long pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { proc = Win32.GetProcAddress(Win32.Instance.opengl32Library, name); pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { throw new Exception("Extension function " + name + " not supported"); } } } else if (CurrentOS.IsLinux) { proc = glxGetProcAddress(name); if (proc == IntPtr.Zero) { throw new Exception("Extension function " + name + " not supported"); } } else { throw new NotImplementedException("Unsupported OS."); } // Get the delegate for the function pointer. del = Marshal.GetDelegateForFunctionPointer(proc, delegateType); // Add to the dictionary. extensionFunctions.Add(name, del); } return(del as T); }
private static IntPtr GetProc(string name) { IntPtr proc = IntPtr.Zero; // check https://www.GL.org/wiki/Load_OpenGL_Functions proc = Win32.wglGetProcAddress(name); long pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { proc = Win32.GetProcAddress(name); pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { Debug.WriteLine(string.Format( "Extension function [{0}] not supported!", name)); proc = IntPtr.Zero; } } return(proc); }
private static IntPtr GetProc(string name) { IntPtr proc = IntPtr.Zero; if (CurrentOS.IsWindows) { // check https://www.opengl.org/wiki/Load_OpenGL_Functions proc = Win32.wglGetProcAddress(name); long pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { proc = Win32.GetProcAddress(name); pointer = proc.ToInt64(); if (-1 <= pointer && pointer <= 3) { Debug.WriteLine(string.Format( "Extension function [{0}] not supported!", name)); proc = IntPtr.Zero; } } } else if (CurrentOS.IsLinux) { proc = glxGetProcAddress(name); if (proc == IntPtr.Zero) { Debug.WriteLine(string.Format( "Extension function [{0}] not supported!", name)); } } else { throw new NotImplementedException("Unsupported OS."); } return(proc); }