public IntPtr BuildModernContext(ContextCreationParameters contextParameters, ILibrary library, IContext sharedContext, IntPtr legacyContextHandle)
{
if (!_wgl.wglMakeCurrent((IntPtr)contextParameters.Device, legacyContextHandle))
throw new ContextCreationException("Unable to make temporary context current.", contextParameters);
var choosePixelFormat = library.GetProcedure<wglChoosePixelFormatARB>("wglChoosePixelFormatARB");
var createContext = library.GetProcedure<wglCreateContextAttribsARB>("wglCreateContextAttribsARB");
if (choosePixelFormat == null)
throw new MissingEntryPointException("wglChoosePixelFormatARB", library);
if (createContext == null)
throw new MissingEntryPointException("wglCreateContextAttribsARB", library);
var formats = new int[1];
var numFormats = new uint[1];
var pixelFormatParameters = new[]
{
WindowsContext.WGLPixelFormatConstants.WGL_DRAW_TO_WINDOW_ARB, (int) GLboolean.True,
WindowsContext.WGLPixelFormatConstants.WGL_SUPPORT_OPENGL_ARB, (int) GLboolean.True,
WindowsContext.WGLPixelFormatConstants.WGL_DOUBLE_BUFFER_ARB, (int) GLboolean.True,
WindowsContext.WGLPixelFormatConstants.WGL_PIXEL_TYPE_ARB, WindowsContext.WGLPixelFormatConstants.WGL_TYPE_RGBA_ARB,
WindowsContext.WGLPixelFormatConstants.WGL_COLOR_BITS_ARB, contextParameters.ColorBits.HasValue ? contextParameters.ColorBits.Value : 32,
WindowsContext.WGLPixelFormatConstants.WGL_DEPTH_BITS_ARB, contextParameters.DepthBits.HasValue ? contextParameters.DepthBits.Value : 24,
WindowsContext.WGLPixelFormatConstants.WGL_STENCIL_BITS_ARB, contextParameters.StencilBits.HasValue ? contextParameters.StencilBits.Value : 8,
WindowsContext.WGLPixelFormatConstants.WGL_SAMPLE_BUFFERS_ARB, 1,
WindowsContext.WGLPixelFormatConstants.WGL_SAMPLES_ARB, 4,
0 //End
};
if (!choosePixelFormat((IntPtr)contextParameters.Device, pixelFormatParameters, null, 1, formats, numFormats))
{
throw new ContextCreationException("Unable to choose pixel format.", contextParameters);
}
var finalContext = createContext((IntPtr)contextParameters.Device, sharedContext != null ? sharedContext.Handle : IntPtr.Zero, new[]
{
(int)WGLContextAttributes.MajorVersion, contextParameters.MajorVersion.HasValue ? contextParameters.MajorVersion.Value : 3,
(int)WGLContextAttributes.MinorVersion, contextParameters.MinorVersion.HasValue ? contextParameters.MinorVersion.Value : 2,
(int)WGLContextAttributes.Flags, 0,
(int)WGLContextAttributes.ProfileMask, (int)WGLContextProfileMask.CoreProfileBit,
0
}
);
if(finalContext == IntPtr.Zero)
throw new ContextCreationException("Unable to create OpenGL 3.0 context.", contextParameters);
return finalContext;
}