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(_requestedOpenGLVersion);
if (requestedVersionNumber.IsAtLeastVersion(3, 0) == false)
{
return;
}
// Now the none-trivial case. We must use the WGL_ARB_create_context extension to
// attempt to create a 3.0+ context.
try
{
Int32[] attributes =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, requestedVersionNumber.Major,
WGL_CONTEXT_MINOR_VERSION_ARB, requestedVersionNumber.Minor,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
var hrc = CreateContextAttribsARB(IntPtr.Zero, attributes);
GLWindows.wglMakeCurrent(IntPtr.Zero, IntPtr.Zero);
GLWindows.wglDeleteContext(_renderContextHandle);
GLWindows.wglMakeCurrent(_deviceContextHandle, hrc);
_renderContextHandle = hrc;
}
catch (Exception)
{
// TODO: can we actually get the real version?
}
}
