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Refactored environment config detection

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This significantly cleans up the startup sequence on all platforms:
- X11 is not detected on non-Linux platforms unless the user explicitly
requests it
- Supports selection of platform abstractions (SDL) vs native
implementations.
- Returns correct flags on Android and iOS.

This contains a semantic change: OpenTK.Configuration will not return
correct values until OpenTK.Toolkit.Init() has been called, either
directly or indirectly (e.g. by creating a window.)
This commit is contained in:
Stefanos A. 2013-11-12 20:32:31 +01:00
parent 7503a87b3f
commit 663864f083
1 changed files with 80 additions and 67 deletions
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155
Source/OpenTK/Configuration.cs
View file

@ -35,23 +35,22 @@ using System.Reflection;
namespace OpenTK
{
/// <summary>Provides information about the underlying OS and runtime.</summary>
public static class Configuration
/// <summary>
/// Provides information about the underlying OS and runtime.
/// You must call <c>Toolkit.Init</c> before accessing members
/// of this class.
/// </summary>
public sealed class Configuration
{
static bool runningOnWindows, runningOnUnix, runningOnX11, runningOnMacOS, runningOnLinux;
static bool runningOnMono;
static bool runningOnAndroid;
static bool? sdl2supported;
volatile static bool initialized;
readonly static object InitLock = new object();
#region Constructors
// Detects the underlying OS and runtime.
static Configuration()
{
Init();
}
Configuration() { }
#endregion
@ -89,7 +88,8 @@ namespace OpenTK
/// </summary>
public static bool RunningOnSdl2
{
get { return Sdl2Supported; }
get;
private set;
}
#endregion
@ -190,7 +190,14 @@ namespace OpenTK
[DllImport("libc")]
private static extern void uname(out utsname uname_struct);
private static bool DetectSdl2()
static bool DetectMono()
{
// Detect the Mono runtime (code taken from http://mono.wikia.com/wiki/Detecting_if_program_is_running_in_Mono).
Type t = Type.GetType("Mono.Runtime");
return t != null;
}
static bool DetectSdl2()
{
bool supported = false;
@ -224,6 +231,48 @@ namespace OpenTK
return supported;
}
static void DetectUnix(out bool unix, out bool linux, out bool macos)
{
unix = linux = macos = false;
string kernel_name = DetectUnixKernel();
switch (kernel_name)
{
case null:
case "":
throw new PlatformNotSupportedException(
"Unknown platform. Please file a bug report at http://www.opentk.com");
case "Linux":
linux = unix = true;
break;
case "Darwin":
macos = unix = true;
break;
default:
unix = true;
break;
}
}
static bool DetectWindows()
{
return
System.Environment.OSVersion.Platform == PlatformID.Win32NT ||
System.Environment.OSVersion.Platform == PlatformID.Win32S ||
System.Environment.OSVersion.Platform == PlatformID.Win32Windows ||
System.Environment.OSVersion.Platform == PlatformID.WinCE;
}
static bool DetectX11()
{
// Detect whether X is present.
try { return OpenTK.Platform.X11.API.DefaultDisplay != IntPtr.Zero; }
catch { return false; }
}
#endregion
#endregion
@ -232,78 +281,42 @@ namespace OpenTK
#region Internal Methods
internal static bool Sdl2Supported
{
get
{
return DetectSdl2();
}
}
internal static void Init()
// Detects the underlying OS and runtime.
internal static void Init(ToolkitOptions options)
{
lock (InitLock)
{
if (!initialized)
{
if (System.Environment.OSVersion.Platform == PlatformID.Win32NT ||
System.Environment.OSVersion.Platform == PlatformID.Win32S ||
System.Environment.OSVersion.Platform == PlatformID.Win32Windows ||
System.Environment.OSVersion.Platform == PlatformID.WinCE)
{
runningOnWindows = true;
}
else if (System.Environment.OSVersion.Platform == PlatformID.Unix ||
System.Environment.OSVersion.Platform == (PlatformID)4)
{
// Distinguish between Linux, Mac OS X and other Unix operating systems.
string kernel_name = DetectUnixKernel();
switch (kernel_name)
{
case null:
case "":
throw new PlatformNotSupportedException(
"Unknown platform. Please file a bug report at http://www.opentk.com/node/add/project-issue/opentk");
case "Linux":
runningOnLinux = runningOnUnix = true;
break;
case "Darwin":
runningOnMacOS = runningOnUnix = true;
break;
default:
runningOnUnix = true;
break;
}
}
else
{
throw new PlatformNotSupportedException("Unknown platform. Please report this error at http://www.opentk.com.");
}
// Detect whether X is present.
// Hack: it seems that this check will cause X to initialize itself on Mac OS X Leopard and newer.
// We don't want that (we'll be using the native interfaces anyway), so we'll avoid this check
// when we detect Mac OS X.
if (!RunningOnMacOS)
{
try { runningOnX11 = OpenTK.Platform.X11.API.DefaultDisplay != IntPtr.Zero; }
catch { }
}
// Detect the Mono runtime (code taken from http://mono.wikia.com/wiki/Detecting_if_program_is_running_in_Mono).
Type t = Type.GetType("Mono.Runtime");
if (t != null)
#if ANDROID
runningOnMono = true;
runningOnAnroid = true;
#elif IPHONE
runningOnMono = true;
runningOnIOS = true;
#else
runningOnMono = DetectMono();
runningOnWindows = DetectWindows();
if (!runningOnWindows)
{
DetectUnix(out runningOnUnix, out runningOnLinux, out runningOnMacOS);
}
if (options.Backend == PlatformBackend.Default)
{
RunningOnSdl2 = DetectSdl2();
}
else if (runningOnLinux || options.Backend == PlatformBackend.PreferX11)
{
runningOnX11 = DetectX11();
}
initialized = true;
#endif
Debug.Print("Detected configuration: {0} / {1}",
RunningOnWindows ? "Windows" : RunningOnLinux ? "Linux" : RunningOnMacOS ? "MacOS" :
runningOnUnix ? "Unix" : RunningOnX11 ? "X11" : "Unknown Platform",
RunningOnMono ? "Mono" : ".Net");
initialized = true;
}
}
}