/// <summary>
/// Attempts to create an OpenGL context.
/// </summary>
private static IntPtr?TryCreateOpenGLContext(UltravioletContext uv, OpenGLEnvironment environment,
Version versionRequested, Version versionRequired, Boolean debug, Boolean throwOnFailure)
{
if (!environment.RequestDebugContext(debug))
{
environment.ThrowPlatformErrorException();
}
var gles = (uv.Platform == UltravioletPlatform.Android || uv.Platform == UltravioletPlatform.iOS);
var versionArray = gles ? KnownOpenGLESVersions : KnownOpenGLVersions;
var versionMin = versionRequested ?? versionRequired;
var versionCurrent = versionRequested ?? versionArray[0];
var versionCurrentIndex = Array.IndexOf(versionArray, versionCurrent);
IntPtr context;
do
{
if (versionCurrent < versionMin)
{
if (throwOnFailure)
{
throw new InvalidOperationException(OpenGLStrings.DoesNotMeetMinimumVersionRequirement.Format(versionMin.Major, versionMin.Minor));
}
return(null);
}
if (!environment.RequestOpenGLVersion(versionCurrent))
{
environment.ThrowPlatformErrorException();
}
versionCurrent = versionArray[++versionCurrentIndex];
}while ((context = environment.CreateOpenGLContext()) == IntPtr.Zero);
return(context);
}
