/// <summary>
/// Checks if a Wgl extension is supported by the given context.
/// </summary>
/// <param name="dc">The device context.</param>
/// <param name="name">The extension to check.</param>
/// <returns>True if the extension is supported by the given context, false otherwise</returns>
public static bool SupportsExtension(IntPtr dc, string name)
{
lock (sync)
{
if (extensions.Count == 0)
{
// We cache this locally, as another thread might create a context which doesn't support this method.
// The design is far from ideal, but there's no good solution to this issue as long as we are using
// static WGL/GL classes. Fortunately, this issue is extremely unlikely to arise in practice, as you'd
// have to create one accelerated and one non-accelerated context in the same application, with the
// non-accelerated context coming second.
bool get_arb = SupportsFunction("wglGetExtensionsStringARB");
bool get_ext = SupportsFunction("wglGetExtensionsStringEXT");
string str =
get_arb ? Wgl.GetExtensionsStringARB(dc) :
get_ext?Wgl.GetExtensionsStringEXT() :
String.Empty;
if (!String.IsNullOrEmpty(str))
{
foreach (string ext in str.Split(' '))
{
extensions.Add(ext, true);
}
}
}
}
if (extensions.Count > 0)
{
return(extensions.ContainsKey(name));
}
return(false);
}