public static ContextHandle CreateContextCurrent(IntPtr hwnd)
{
var context = ContextHandle.Zero;
var hdc = Win32Helper.GetDC(hwnd);//取得设备上下文
PixelFormatDescriptor pfd;
pfd.Size = 40;
pfd.Version = 1;
pfd.Flags = PixelFormatDescriptorFlags.DRAW_TO_WINDOW | PixelFormatDescriptorFlags.SUPPORT_OPENGL | PixelFormatDescriptorFlags.DOUBLEBUFFER;
pfd.PixelType = PixelType.RGBA;
pfd.ColorBits = 32;
pfd.DepthBits = 16;
pfd.StencilBits = 8;
int pixelFormat;
unsafe
{
PixelFormatDescriptor *ppfd = &pfd;
pixelFormat = Win32Helper.ChoosePixelFormat(hdc, (IntPtr)ppfd); //选择像素格式
Win32Helper.SetPixelFormat(hdc, pixelFormat, (IntPtr)ppfd); //设置像素格式
context = new ContextHandle(hdc, Win32Helper.CreateContext(hdc)); //建立OpenGL渲染上下文
MakeCurrentContext(context); //激活当前渲染上下文
_contexts[context.HDC] = context;
}
return(context);
}
internal extern static unsafe Boolean SetPixelFormat(IntPtr hdc, int ipfd, PixelFormatDescriptor *ppfd);
internal extern static unsafe int ChoosePixelFormat(IntPtr hDc, PixelFormatDescriptor *pPfd);
internal extern static unsafe int DescribePixelFormat(IntPtr hdc, int ipfd, UInt32 cjpfd, PixelFormatDescriptor *ppfd);
unsafe public static extern int ChoosePixelFormat(IntPtr hDC, PixelFormatDescriptor *pfd);
unsafe public static extern Boolean SetPixelFormat(IntPtr hDC, int format, PixelFormatDescriptor *pfd);
public static extern bool SetPixelFormat(IntPtr hdc, int iPixelFormat, PixelFormatDescriptor *ppfd);
unsafe public static extern int DescribePixelFormat(IntPtr hDC, int index, int pfdStructSize, PixelFormatDescriptor *pfd);
public static extern int ChoosePixelFormat(IntPtr hdc, PixelFormatDescriptor *ppfd);
public static extern unsafe bool wglSetPixelFormat(IntPtr hdc, int ipfd, PixelFormatDescriptor *ppfd);
public static extern unsafe int wglDescribePixelFormat(IntPtr hdc, int ipfd, uint cjpfd,
PixelFormatDescriptor *ppfd);
public static extern unsafe int wglChoosePixelFormat(IntPtr hDc, PixelFormatDescriptor *pPfd);
public static extern int DescribePixelFormat(VoidPtr hdc, int iPixelFormat, ushort nBytes, PixelFormatDescriptor *pfd);
