using System; using System.Collections.Generic; using System.Runtime.InteropServices; namespace CPF.Skia { public class Wgl { private const string opengl32 = "opengl32.dll"; public const int NONE = 0; public const int FALSE = 0; public const int TRUE = 1; public const int GL_VERSION = 0x1F02; public const int GL_EXTENSIONS = 0x1F03; public const int GL_TEXTURE_2D = 0x0DE1; public const int GL_UNSIGNED_BYTE = 0x1401; public const int GL_RGBA = 0x1908; public const int GL_RGBA8 = 0x8058; public const int WGL_NUMBER_PIXEL_FORMATS_ARB = 0x2000; public const int WGL_DRAW_TO_WINDOW_ARB = 0x2001; public const int WGL_DRAW_TO_BITMAP_ARB = 0x2002; public const int WGL_ACCELERATION_ARB = 0x2003; public const int WGL_NEED_PALETTE_ARB = 0x2004; public const int WGL_NEED_SYSTEM_PALETTE_ARB = 0x2005; public const int WGL_SWAP_LAYER_BUFFERS_ARB = 0x2006; public const int WGL_SWAP_METHOD_ARB = 0x2007; public const int WGL_NUMBER_OVERLAYS_ARB = 0x2008; public const int WGL_NUMBER_UNDERLAYS_ARB = 0x2009; public const int WGL_TRANSPARENT_ARB = 0x200A; public const int WGL_TRANSPARENT_RED_VALUE_ARB = 0x2037; public const int WGL_TRANSPARENT_GREEN_VALUE_ARB = 0x2038; public const int WGL_TRANSPARENT_BLUE_VALUE_ARB = 0x2039; public const int WGL_TRANSPARENT_ALPHA_VALUE_ARB = 0x203A; public const int WGL_TRANSPARENT_INDEX_VALUE_ARB = 0x203B; public const int WGL_SHARE_DEPTH_ARB = 0x200C; public const int WGL_SHARE_STENCIL_ARB = 0x200D; public const int WGL_SHARE_ACCUM_ARB = 0x200E; public const int WGL_SUPPORT_GDI_ARB = 0x200F; public const int WGL_SUPPORT_OPENGL_ARB = 0x2010; public const int WGL_DOUBLE_BUFFER_ARB = 0x2011; public const int WGL_STEREO_ARB = 0x2012; public const int WGL_PIXEL_TYPE_ARB = 0x2013; public const int WGL_COLOR_BITS_ARB = 0x2014; public const int WGL_RED_BITS_ARB = 0x2015; public const int WGL_RED_SHIFT_ARB = 0x2016; public const int WGL_GREEN_BITS_ARB = 0x2017; public const int WGL_GREEN_SHIFT_ARB = 0x2018; public const int WGL_BLUE_BITS_ARB = 0x2019; public const int WGL_BLUE_SHIFT_ARB = 0x201A; public const int WGL_ALPHA_BITS_ARB = 0x201B; public const int WGL_ALPHA_SHIFT_ARB = 0x201C; public const int WGL_ACCUM_BITS_ARB = 0x201D; public const int WGL_ACCUM_RED_BITS_ARB = 0x201E; public const int WGL_ACCUM_GREEN_BITS_ARB = 0x201F; public const int WGL_ACCUM_BLUE_BITS_ARB = 0x2020; public const int WGL_ACCUM_ALPHA_BITS_ARB = 0x2021; public const int WGL_DEPTH_BITS_ARB = 0x2022; public const int WGL_STENCIL_BITS_ARB = 0x2023; public const int WGL_AUX_BUFFERS_ARB = 0x2024; public const int WGL_NO_ACCELERATION_ARB = 0x2025; public const int WGL_GENERIC_ACCELERATION_ARB = 0x2026; public const int WGL_FULL_ACCELERATION_ARB = 0x2027; public const int WGL_SWAP_EXCHANGE_ARB = 0x2028; public const int WGL_SWAP_COPY_ARB = 0x2029; public const int WGL_SWAP_UNDEFINED_ARB = 0x202A; public const int WGL_TYPE_RGBA_ARB = 0x202B; public const int WGL_TYPE_COLORINDEX_ARB = 0x202C; static Wgl() { try { // save the current GL context var prevDC = Wgl.wglGetCurrentDC(); var prevGLRC = Wgl.wglGetCurrentContext(); // register the dummy window class var wc = new WNDCLASS { style = (User32.CS_HREDRAW | User32.CS_VREDRAW | User32.CS_OWNDC), lpfnWndProc = (WNDPROC)User32.DefWindowProc, cbClsExtra = 0, cbWndExtra = 0, hInstance = Kernel32.CurrentModuleHandle, hCursor = User32.LoadCursor(IntPtr.Zero, (int)User32.IDC_ARROW), hIcon = User32.LoadIcon(IntPtr.Zero, (IntPtr)User32.IDI_WINLOGO), hbrBackground = IntPtr.Zero, lpszMenuName = null, lpszClassName = "DummyClass" }; if (User32.RegisterClass(ref wc) == 0) { throw new Exception("Could not register dummy class."); } // get the the dummy window bounds var windowRect = new RECT { left = 0, right = 8, top = 0, bottom = 8 }; User32.AdjustWindowRectEx(ref windowRect, WindowStyles.WS_SYSMENU, false, User32.WS_EX_CLIENTEDGE); // create the dummy window var dummyWND = User32.CreateWindowEx( User32.WS_EX_CLIENTEDGE, "DummyClass", "DummyWindow", WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN | WindowStyles.WS_SYSMENU, 0, 0, windowRect.right - windowRect.left, windowRect.bottom - windowRect.top, IntPtr.Zero, IntPtr.Zero, Kernel32.CurrentModuleHandle, IntPtr.Zero); if (dummyWND == IntPtr.Zero) { User32.UnregisterClass("DummyClass", Kernel32.CurrentModuleHandle); throw new Exception("Could not create dummy window."); } // get the dummy DC var dummyDC = User32.GetDC(dummyWND); // get the dummy pixel format var dummyPFD = new PIXELFORMATDESCRIPTOR(); dummyPFD.nSize = (ushort)Marshal.SizeOf(dummyPFD); dummyPFD.nVersion = 1; dummyPFD.dwFlags = Gdi32.PFD_DRAW_TO_WINDOW | Gdi32.PFD_SUPPORT_OPENGL; dummyPFD.iPixelType = Gdi32.PFD_TYPE_RGBA; dummyPFD.cColorBits = 32; dummyPFD.cDepthBits = 24; dummyPFD.cStencilBits = 8; dummyPFD.iLayerType = Gdi32.PFD_MAIN_PLANE; var dummyFormat = Gdi32.ChoosePixelFormat(dummyDC, ref dummyPFD); Gdi32.SetPixelFormat(dummyDC, dummyFormat, ref dummyPFD); // get the dummy GL context var dummyGLRC = Wgl.wglCreateContext(dummyDC); if (dummyGLRC == IntPtr.Zero) { throw new Exception("Could not create dummy GL context."); } Wgl.wglMakeCurrent(dummyDC, dummyGLRC); VersionString = Wgl.GetString(Wgl.GL_VERSION); // get the extension methods using the dummy context wglGetExtensionsStringARB = Wgl.wglGetProcAddress("wglGetExtensionsStringARB"); wglChoosePixelFormatARB = Wgl.wglGetProcAddress("wglChoosePixelFormatARB"); wglCreatePbufferARB = Wgl.wglGetProcAddress("wglCreatePbufferARB"); wglDestroyPbufferARB = Wgl.wglGetProcAddress("wglDestroyPbufferARB"); wglGetPbufferDCARB = Wgl.wglGetProcAddress("wglGetPbufferDCARB"); wglReleasePbufferDCARB = Wgl.wglGetProcAddress("wglReleasePbufferDCARB"); wglSwapIntervalEXT = Wgl.wglGetProcAddress("wglSwapIntervalEXT"); WglCreateContextAttribsArb = Wgl.wglGetProcAddress("wglCreateContextAttribsARB"); // destroy the dummy GL context Wgl.wglMakeCurrent(dummyDC, IntPtr.Zero); Wgl.wglDeleteContext(dummyGLRC); // destroy the dummy window User32.DestroyWindow(dummyWND); User32.UnregisterClass("DummyClass", Kernel32.CurrentModuleHandle); // reset the initial GL context Wgl.wglMakeCurrent(prevDC, prevGLRC); } catch (Exception e) { Console.WriteLine("OpenGl初始化出错：" + e); System.Diagnostics.Debug.WriteLine("OpenGl初始化出错：" + e); } } public static string VersionString { get; } public static bool HasExtension(IntPtr dc, string ext) { if (wglGetExtensionsStringARB == null) { return false; } if (ext == "WGL_ARB_extensions_string") { return true; } return Array.IndexOf(GetExtensionsARB(dc), ext) != -1; } public static string GetExtensionsStringARB(IntPtr dc) { return Marshal.PtrToStringAnsi(wglGetExtensionsStringARB(dc)); } public static string[] GetExtensionsARB(IntPtr dc) { var str = GetExtensionsStringARB(dc); if (string.IsNullOrEmpty(str)) { return new string[0]; } return str.Split(' '); } public static readonly wglGetExtensionsStringARBDelegate wglGetExtensionsStringARB; public static readonly wglChoosePixelFormatARBDelegate wglChoosePixelFormatARB; public static readonly wglCreatePbufferARBDelegate wglCreatePbufferARB; public static readonly wglDestroyPbufferARBDelegate wglDestroyPbufferARB; public static readonly wglGetPbufferDCARBDelegate wglGetPbufferDCARB; public static readonly wglReleasePbufferDCARBDelegate wglReleasePbufferDCARB; public static readonly wglSwapIntervalEXTDelegate wglSwapIntervalEXT; public static readonly WglCreateContextAttribsARBDelegate WglCreateContextAttribsArb; public delegate IntPtr WglCreateContextAttribsARBDelegate(IntPtr hDC, IntPtr hShareContext, int[] attribList); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern IntPtr wglGetCurrentDC(); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern IntPtr wglGetCurrentContext(); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern IntPtr wglCreateContext(IntPtr hDC); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern bool wglMakeCurrent(IntPtr hDC, IntPtr hRC); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern bool wglDeleteContext(IntPtr hRC); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern IntPtr wglGetProcAddress([MarshalAs(UnmanagedType.LPStr)] string lpszProc); public static T wglGetProcAddress(string lpszProc) { var ptr = wglGetProcAddress(lpszProc); if (ptr == IntPtr.Zero) { return default(T); } return (T)(object)Marshal.GetDelegateForFunctionPointer(ptr, typeof(T)); } [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern IntPtr glGetString(uint value); public static string GetString(uint value) { var intPtr = glGetString(value); return Marshal.PtrToStringAnsi(intPtr); } [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern void glGetIntegerv(int name, out int rv); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern void glGenTextures(int n, uint[] textures); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern void glDeleteTextures(int n, uint[] textures); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern void glBindTexture(uint target, uint texture); [DllImport(opengl32, CallingConvention = CallingConvention.Winapi)] public static extern void glTexImage2D(uint target, int level, int internalformat, int width, int height, int border, uint format, uint type, IntPtr pixels); } [UnmanagedFunctionPointer(CallingConvention.Winapi)] public delegate IntPtr wglGetExtensionsStringARBDelegate(IntPtr dc); [UnmanagedFunctionPointer(CallingConvention.Winapi)] [return: MarshalAs(UnmanagedType.Bool)] public delegate bool wglChoosePixelFormatARBDelegate( IntPtr dc, [In] int[] attribIList, [In] float[] attribFList, uint maxFormats, [Out] int[] pixelFormats, out uint numFormats); [UnmanagedFunctionPointer(CallingConvention.Winapi)] public delegate IntPtr wglCreatePbufferARBDelegate(IntPtr dc, int pixelFormat, int width, int height, [In] int[] attribList); [UnmanagedFunctionPointer(CallingConvention.Winapi)] [return: MarshalAs(UnmanagedType.Bool)] public delegate bool wglDestroyPbufferARBDelegate(IntPtr pbuffer); [UnmanagedFunctionPointer(CallingConvention.Winapi)] public delegate IntPtr wglGetPbufferDCARBDelegate(IntPtr pbuffer); [UnmanagedFunctionPointer(CallingConvention.Winapi)] public delegate int wglReleasePbufferDCARBDelegate(IntPtr pbuffer, IntPtr dc); [UnmanagedFunctionPointer(CallingConvention.Winapi)] [return: MarshalAs(UnmanagedType.Bool)] public delegate bool wglSwapIntervalEXTDelegate(int interval); }