mirror of
https://gitee.com/csharpui/CPF.git
synced 2025-04-05 17:37:51 +08:00
300 lines
13 KiB
C#
300 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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namespace CPF.Skia
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{
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public class Wgl
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{
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private const string opengl32 = "opengl32.dll";
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public const int NONE = 0;
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public const int FALSE = 0;
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public const int TRUE = 1;
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public const int GL_VERSION = 0x1F02;
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public const int GL_EXTENSIONS = 0x1F03;
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public const int GL_TEXTURE_2D = 0x0DE1;
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public const int GL_UNSIGNED_BYTE = 0x1401;
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public const int GL_RGBA = 0x1908;
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public const int GL_RGBA8 = 0x8058;
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public const int WGL_NUMBER_PIXEL_FORMATS_ARB = 0x2000;
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public const int WGL_DRAW_TO_WINDOW_ARB = 0x2001;
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public const int WGL_DRAW_TO_BITMAP_ARB = 0x2002;
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public const int WGL_ACCELERATION_ARB = 0x2003;
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public const int WGL_NEED_PALETTE_ARB = 0x2004;
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public const int WGL_NEED_SYSTEM_PALETTE_ARB = 0x2005;
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public const int WGL_SWAP_LAYER_BUFFERS_ARB = 0x2006;
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public const int WGL_SWAP_METHOD_ARB = 0x2007;
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public const int WGL_NUMBER_OVERLAYS_ARB = 0x2008;
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public const int WGL_NUMBER_UNDERLAYS_ARB = 0x2009;
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public const int WGL_TRANSPARENT_ARB = 0x200A;
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public const int WGL_TRANSPARENT_RED_VALUE_ARB = 0x2037;
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public const int WGL_TRANSPARENT_GREEN_VALUE_ARB = 0x2038;
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public const int WGL_TRANSPARENT_BLUE_VALUE_ARB = 0x2039;
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public const int WGL_TRANSPARENT_ALPHA_VALUE_ARB = 0x203A;
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public const int WGL_TRANSPARENT_INDEX_VALUE_ARB = 0x203B;
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public const int WGL_SHARE_DEPTH_ARB = 0x200C;
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public const int WGL_SHARE_STENCIL_ARB = 0x200D;
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public const int WGL_SHARE_ACCUM_ARB = 0x200E;
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public const int WGL_SUPPORT_GDI_ARB = 0x200F;
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public const int WGL_SUPPORT_OPENGL_ARB = 0x2010;
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public const int WGL_DOUBLE_BUFFER_ARB = 0x2011;
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public const int WGL_STEREO_ARB = 0x2012;
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public const int WGL_PIXEL_TYPE_ARB = 0x2013;
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public const int WGL_COLOR_BITS_ARB = 0x2014;
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public const int WGL_RED_BITS_ARB = 0x2015;
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public const int WGL_RED_SHIFT_ARB = 0x2016;
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public const int WGL_GREEN_BITS_ARB = 0x2017;
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public const int WGL_GREEN_SHIFT_ARB = 0x2018;
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public const int WGL_BLUE_BITS_ARB = 0x2019;
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public const int WGL_BLUE_SHIFT_ARB = 0x201A;
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public const int WGL_ALPHA_BITS_ARB = 0x201B;
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public const int WGL_ALPHA_SHIFT_ARB = 0x201C;
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public const int WGL_ACCUM_BITS_ARB = 0x201D;
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public const int WGL_ACCUM_RED_BITS_ARB = 0x201E;
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public const int WGL_ACCUM_GREEN_BITS_ARB = 0x201F;
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public const int WGL_ACCUM_BLUE_BITS_ARB = 0x2020;
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public const int WGL_ACCUM_ALPHA_BITS_ARB = 0x2021;
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public const int WGL_DEPTH_BITS_ARB = 0x2022;
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public const int WGL_STENCIL_BITS_ARB = 0x2023;
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public const int WGL_AUX_BUFFERS_ARB = 0x2024;
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public const int WGL_NO_ACCELERATION_ARB = 0x2025;
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public const int WGL_GENERIC_ACCELERATION_ARB = 0x2026;
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public const int WGL_FULL_ACCELERATION_ARB = 0x2027;
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public const int WGL_SWAP_EXCHANGE_ARB = 0x2028;
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public const int WGL_SWAP_COPY_ARB = 0x2029;
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public const int WGL_SWAP_UNDEFINED_ARB = 0x202A;
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public const int WGL_TYPE_RGBA_ARB = 0x202B;
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public const int WGL_TYPE_COLORINDEX_ARB = 0x202C;
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static Wgl()
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{
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try
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{
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// save the current GL context
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var prevDC = Wgl.wglGetCurrentDC();
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var prevGLRC = Wgl.wglGetCurrentContext();
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// register the dummy window class
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var wc = new WNDCLASS
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{
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style = (User32.CS_HREDRAW | User32.CS_VREDRAW | User32.CS_OWNDC),
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lpfnWndProc = (WNDPROC)User32.DefWindowProc,
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cbClsExtra = 0,
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cbWndExtra = 0,
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hInstance = Kernel32.CurrentModuleHandle,
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hCursor = User32.LoadCursor(IntPtr.Zero, (int)User32.IDC_ARROW),
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hIcon = User32.LoadIcon(IntPtr.Zero, (IntPtr)User32.IDI_WINLOGO),
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hbrBackground = IntPtr.Zero,
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lpszMenuName = null,
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lpszClassName = "DummyClass"
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};
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if (User32.RegisterClass(ref wc) == 0)
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{
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throw new Exception("Could not register dummy class.");
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}
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// get the the dummy window bounds
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var windowRect = new RECT { left = 0, right = 8, top = 0, bottom = 8 };
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User32.AdjustWindowRectEx(ref windowRect, WindowStyles.WS_SYSMENU, false, User32.WS_EX_CLIENTEDGE);
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// create the dummy window
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var dummyWND = User32.CreateWindowEx(
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User32.WS_EX_CLIENTEDGE,
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"DummyClass",
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"DummyWindow",
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WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN | WindowStyles.WS_SYSMENU,
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0, 0,
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windowRect.right - windowRect.left, windowRect.bottom - windowRect.top,
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IntPtr.Zero, IntPtr.Zero, Kernel32.CurrentModuleHandle, IntPtr.Zero);
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if (dummyWND == IntPtr.Zero)
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{
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User32.UnregisterClass("DummyClass", Kernel32.CurrentModuleHandle);
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throw new Exception("Could not create dummy window.");
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}
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// get the dummy DC
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var dummyDC = User32.GetDC(dummyWND);
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// get the dummy pixel format
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var dummyPFD = new PIXELFORMATDESCRIPTOR();
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dummyPFD.nSize = (ushort)Marshal.SizeOf(dummyPFD);
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dummyPFD.nVersion = 1;
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dummyPFD.dwFlags = Gdi32.PFD_DRAW_TO_WINDOW | Gdi32.PFD_SUPPORT_OPENGL;
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dummyPFD.iPixelType = Gdi32.PFD_TYPE_RGBA;
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dummyPFD.cColorBits = 32;
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dummyPFD.cDepthBits = 24;
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dummyPFD.cStencilBits = 8;
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dummyPFD.iLayerType = Gdi32.PFD_MAIN_PLANE;
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var dummyFormat = Gdi32.ChoosePixelFormat(dummyDC, ref dummyPFD);
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Gdi32.SetPixelFormat(dummyDC, dummyFormat, ref dummyPFD);
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// get the dummy GL context
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var dummyGLRC = Wgl.wglCreateContext(dummyDC);
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if (dummyGLRC == IntPtr.Zero)
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{
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throw new Exception("Could not create dummy GL context.");
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}
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Wgl.wglMakeCurrent(dummyDC, dummyGLRC);
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VersionString = Wgl.GetString(Wgl.GL_VERSION);
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// get the extension methods using the dummy context
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wglGetExtensionsStringARB = Wgl.wglGetProcAddress<wglGetExtensionsStringARBDelegate>("wglGetExtensionsStringARB");
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wglChoosePixelFormatARB = Wgl.wglGetProcAddress<wglChoosePixelFormatARBDelegate>("wglChoosePixelFormatARB");
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wglCreatePbufferARB = Wgl.wglGetProcAddress<wglCreatePbufferARBDelegate>("wglCreatePbufferARB");
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wglDestroyPbufferARB = Wgl.wglGetProcAddress<wglDestroyPbufferARBDelegate>("wglDestroyPbufferARB");
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wglGetPbufferDCARB = Wgl.wglGetProcAddress<wglGetPbufferDCARBDelegate>("wglGetPbufferDCARB");
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wglReleasePbufferDCARB = Wgl.wglGetProcAddress<wglReleasePbufferDCARBDelegate>("wglReleasePbufferDCARB");
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wglSwapIntervalEXT = Wgl.wglGetProcAddress<wglSwapIntervalEXTDelegate>("wglSwapIntervalEXT");
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WglCreateContextAttribsArb = Wgl.wglGetProcAddress<WglCreateContextAttribsARBDelegate>("wglCreateContextAttribsARB");
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// destroy the dummy GL context
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Wgl.wglMakeCurrent(dummyDC, IntPtr.Zero);
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Wgl.wglDeleteContext(dummyGLRC);
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// destroy the dummy window
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User32.DestroyWindow(dummyWND);
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User32.UnregisterClass("DummyClass", Kernel32.CurrentModuleHandle);
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// reset the initial GL context
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Wgl.wglMakeCurrent(prevDC, prevGLRC);
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}
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catch (Exception e)
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{
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Console.WriteLine("OpenGl初始化出错：" + e);
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System.Diagnostics.Debug.WriteLine("OpenGl初始化出错：" + e);
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}
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}
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public static string VersionString { get; }
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public static bool HasExtension(IntPtr dc, string ext)
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{
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if (wglGetExtensionsStringARB == null)
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{
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return false;
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}
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if (ext == "WGL_ARB_extensions_string")
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{
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return true;
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}
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return Array.IndexOf(GetExtensionsARB(dc), ext) != -1;
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}
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public static string GetExtensionsStringARB(IntPtr dc)
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{
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return Marshal.PtrToStringAnsi(wglGetExtensionsStringARB(dc));
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}
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public static string[] GetExtensionsARB(IntPtr dc)
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{
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var str = GetExtensionsStringARB(dc);
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if (string.IsNullOrEmpty(str))
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{
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return new string[0];
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}
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return str.Split(' ');
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}
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public static readonly wglGetExtensionsStringARBDelegate wglGetExtensionsStringARB;
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public static readonly wglChoosePixelFormatARBDelegate wglChoosePixelFormatARB;
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public static readonly wglCreatePbufferARBDelegate wglCreatePbufferARB;
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public static readonly wglDestroyPbufferARBDelegate wglDestroyPbufferARB;
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public static readonly wglGetPbufferDCARBDelegate wglGetPbufferDCARB;
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public static readonly wglReleasePbufferDCARBDelegate wglReleasePbufferDCARB;
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public static readonly wglSwapIntervalEXTDelegate wglSwapIntervalEXT;
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public static readonly WglCreateContextAttribsARBDelegate WglCreateContextAttribsArb;
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public delegate IntPtr WglCreateContextAttribsARBDelegate(IntPtr hDC, IntPtr hShareContext, int[] attribList);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern IntPtr wglGetCurrentDC();
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern IntPtr wglGetCurrentContext();
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern IntPtr wglCreateContext(IntPtr hDC);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern bool wglMakeCurrent(IntPtr hDC, IntPtr hRC);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern bool wglDeleteContext(IntPtr hRC);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern IntPtr wglGetProcAddress([MarshalAs(UnmanagedType.LPStr)] string lpszProc);
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public static T wglGetProcAddress<T>(string lpszProc)
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{
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var ptr = wglGetProcAddress(lpszProc);
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if (ptr == IntPtr.Zero)
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{
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return default(T);
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}
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return (T)(object)Marshal.GetDelegateForFunctionPointer(ptr, typeof(T));
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}
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern IntPtr glGetString(uint value);
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public static string GetString(uint value)
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{
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var intPtr = glGetString(value);
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return Marshal.PtrToStringAnsi(intPtr);
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}
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern void glGetIntegerv(int name, out int rv);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern void glGenTextures(int n, uint[] textures);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern void glDeleteTextures(int n, uint[] textures);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern void glBindTexture(uint target, uint texture);
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[DllImport(opengl32, CallingConvention = CallingConvention.Winapi)]
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public static extern void glTexImage2D(uint target, int level, int internalformat, int width, int height, int border, uint format, uint type, IntPtr pixels);
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}
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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public delegate IntPtr wglGetExtensionsStringARBDelegate(IntPtr dc);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public delegate bool wglChoosePixelFormatARBDelegate(
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IntPtr dc,
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[In] int[] attribIList,
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[In] float[] attribFList,
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uint maxFormats,
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[Out] int[] pixelFormats,
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out uint numFormats);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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public delegate IntPtr wglCreatePbufferARBDelegate(IntPtr dc, int pixelFormat, int width, int height, [In] int[] attribList);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public delegate bool wglDestroyPbufferARBDelegate(IntPtr pbuffer);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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public delegate IntPtr wglGetPbufferDCARBDelegate(IntPtr pbuffer);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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public delegate int wglReleasePbufferDCARBDelegate(IntPtr pbuffer, IntPtr dc);
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[UnmanagedFunctionPointer(CallingConvention.Winapi)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public delegate bool wglSwapIntervalEXTDelegate(int interval);
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}
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