/// <summary>
/// Builds a cache of the supported extensions to speed up searches.
/// </summary>
private static void BuildExtensionList()
{
// Assumes there is an opengl context current.
AvailableExtensions.Clear();
string version_string = GL.GetString(StringName.Version);
if (String.IsNullOrEmpty(version_string))
{
throw new ApplicationException("Failed to build extension list. Is there an opengl context current?");
}
string version;
// Most drivers return the version in the 3 first characters of the version string,
// (e.g. on Ati X1950 with Catalyst 7.10 -> "2.0.6956 Release"). However, Mesa seems
// to do something strange: "1.4 (2.1 Mesa 7.0.1).".
// Update: this seems to occur with indirect rendering. E.g. Ati 8.2: 1.4 (2.1.7281 ...)
// We'll do some trickery to get the second number (2.1), but this may break on
// some implementations...
//if (version_string.ToLower().Contains("mesa"))
{
int index = version_string.IndexOf('(');
if (index != -1)
{
version = version_string.Substring(index + 1, 3);
}
else
{
version = version_string.TrimStart(' ');
}
}
//else
// version = version_string.TrimStart(' ');
if (version.StartsWith("1.1"))
{
AvailableExtensions.Add("glversion11", true);
}
else if (version.StartsWith("1.2"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
}
else if (version.StartsWith("1.3"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
}
else if (version.StartsWith("1.4"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
}
else if (version.StartsWith("1.5"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
AvailableExtensions.Add("glversion15", true);
}
else if (version.StartsWith("2.0"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
AvailableExtensions.Add("glversion15", true);
AvailableExtensions.Add("glversion20", true);
}
else if (version.StartsWith("2.1"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
AvailableExtensions.Add("glversion15", true);
AvailableExtensions.Add("glversion20", true);
AvailableExtensions.Add("glversion21", true);
}
else if (version.StartsWith("3.0"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
AvailableExtensions.Add("glversion15", true);
AvailableExtensions.Add("glversion20", true);
AvailableExtensions.Add("glversion21", true);
AvailableExtensions.Add("glversion30", true);
}
else if (version.StartsWith("3.1"))
{
AvailableExtensions.Add("glversion11", true);
AvailableExtensions.Add("glversion12", true);
AvailableExtensions.Add("glversion13", true);
AvailableExtensions.Add("glversion14", true);
AvailableExtensions.Add("glversion15", true);
AvailableExtensions.Add("glversion20", true);
AvailableExtensions.Add("glversion21", true);
AvailableExtensions.Add("glversion30", true);
AvailableExtensions.Add("glversion31", true);
}
string extension_string = GL.GetString(StringName.Extensions);
if (String.IsNullOrEmpty(extension_string))
{
return; // no extensions are available
}
string[] extensions = extension_string.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string ext in extensions)
{
AvailableExtensions.Add(ext.Replace("_", String.Empty).ToLower(), true);
}
rebuildExtensionList = false;
}