| 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);
}