public void Cleanup()
{
OpenGl32.WglMakeCurrent(_deviceContext, IntPtr.Zero);
OpenGl32.WglDeleteContext(_openGlContext);
WindowExtensions.Cleanup();
}
public IntPtr GetFunctionPtr(string functionName)
{
var address = OpenGl32.WglGetProcAddress(functionName);
if (address == IntPtr.Zero)
{
NativeLibrary.TryGetExport(_openGlLibrary, functionName, out address);
}
return(address);
}
private void MakeContextCurrent()
{
unsafe
{
var pfdSize = sizeof(Gdi32.PixelFormatDescriptor);
var pfd = new Gdi32.PixelFormatDescriptor
{
nSize = (ushort)pfdSize,
nVersion = 1,
dwFlags = 0x4 /*PFD_DRAW_TO_WINDOW*/ | 0x20 /*PFD_SUPPORT_OPENGL*/ | 0x1 /*PFD_DOUBLEBUFFER*/,
iPixelType = 0 /*PFD_TYPE_RGBA*/,
cColorBits = 32,
cDepthBits = 32,
cStencilBits = 8,
cAuxBuffers = 0,
iLayerType = 0 /*PFD_MAIN_PLANE*/
};
_deviceContext = User32.GetDC(_window.NativeHandle);
var pixelFormat = Gdi32.ChoosePixelFormat(_deviceContext, ref pfd);
var result = Gdi32.SetPixelFormat(_deviceContext, pixelFormat, ref pfd);
Marshal.ThrowExceptionForHR(result);
var tempContext = OpenGl32.WglCreateContext(_deviceContext);
OpenGl32.WglMakeCurrent(_deviceContext, tempContext);
var wglCreateContextAttribsArb = OpenGl32.GetWglCreateContextAttribsArbProc();
var attribs = new[] { /*WGL_CONTEXT_PROFILE_MASK_ARB*/ 0x9126, /*WGL_CONTEXT_CORE_PROFILE_BIT_ARB*/ 0x00000001, 0 };
fixed(int *attribPtr = attribs)
_openGlContext = wglCreateContextAttribsArb(_deviceContext, IntPtr.Zero, attribPtr);
OpenGl32.WglMakeCurrent(_deviceContext, _openGlContext);
OpenGl32.WglDeleteContext(tempContext);
WindowExtensions.LoadOpenGLFunctions <Win32OpenGLWindowExtensions>(null);
}
}
