Example #1
0
        /// <summary>
        /// Gets the version attribute of an enumeration value <paramref name="enumeration"/>.
        /// </summary>
        /// <param name="enumeration">The enumeration.</param>
        /// <returns>The <see cref="VersionAttribute"/> defined on <paramref name="enumeration "/>, or null of none exists.</returns>
        public static VersionAttribute GetVersionAttribute(Enum enumeration)
        {
            //  Get the attribute from the enumeration value (if it exists).
            Type   type = enumeration.GetType();
            string str  = enumeration.ToString();

            MemberInfo[] members = type.GetMember(str);
            MemberInfo   member  = members.Single();

            object[] objs = member.GetCustomAttributes(typeof(VersionAttribute), false);
            IEnumerable <VersionAttribute> attributes = objs.OfType <VersionAttribute>();
            VersionAttribute firstOrDefault           = attributes.FirstOrDefault();

            return(firstOrDefault);
        }
Example #2
0
        /// <summary>
        /// Only valid to be called after the render context is created, this function attempts to
        /// move the render context to the OpenGL version originally requested. If this is &gt; 2.1, this
        /// means building a new context. If this fails, we'll have to make do with 2.1.
        /// </summary>
        /// <param name="gl">The OpenGL instance.</param>
        protected void UpdateContextVersion()
        {
            //  If the request version number is anything up to and including 2.1, standard render contexts
            //  will provide what we need (as long as the graphics card drivers are up to date).
            var requestedVersionNumber = VersionAttribute.GetVersionAttribute(RequestedGLVersion);

            if (requestedVersionNumber.IsAtLeastVersion(3, 0) == false)
            {
                CreatedGLVersion = RequestedGLVersion;
                return;
            }

            //  Now the none-trivial case. We must use the WGL_ARB_create_context extension to
            //  attempt to create a 3.0+ context.
            try
            {
                int[] attributes =
                {
                    GL.WGL_CONTEXT_MAJOR_VERSION_ARB, requestedVersionNumber.Major,
                    GL.WGL_CONTEXT_MINOR_VERSION_ARB, requestedVersionNumber.Minor,
                    GL.WGL_CONTEXT_FLAGS_ARB,         GL.WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB, // compatible profile
#if DEBUG
                    GL.WGL_CONTEXT_FLAGS_ARB,         GL.WGL_CONTEXT_DEBUG_BIT_ARB,              // this is a debug context
#endif
                    0
                };
                IntPtr hrc = GL.CreateContextAttribsARB(this.DeviceContextHandle, IntPtr.Zero, attributes);
                Win32.wglMakeCurrent(IntPtr.Zero, IntPtr.Zero);
                Win32.wglDeleteContext(RenderContextHandle);
                Win32.wglMakeCurrent(DeviceContextHandle, hrc);
                RenderContextHandle = hrc;
            }
            catch (Exception)
            {
                //  TODO: can we actually get the real version?
                CreatedGLVersion = GLVersion.OpenGL2_1;
            }
        }