/// <summary>
/// Create Context using user setting.
/// </summary>
/// <param name="c">Control to host the rendering context</param>
/// <param name="setting">Context setting parameters</param>
/// <returns>Rendering context</returns>
public static new Context CreateContext(IntPtr hWnd, ContextSettings setting)
{
ContextWin rc = new ContextWin(setting, hWnd);
rc.CreateOldContext();
// set highest context major version
if (setting.MajorVersion == 0xff)
{
setting.MajorVersion = (byte)GetInteger(GL.MAJOR_VERSION);
}
// set highest context minor version
if (setting.MinorVersion == 0xff)
{
setting.MinorVersion = (byte)GetInteger(GL.MINOR_VERSION);
}
// create new context using ARB_create_context
if (setting.MajorVersion >= 3)
{
rc.CreateNewContext();
}
else
{
setting.Profile = ContextProfile.None;
setting.Flags = ContextFlags.None;
}
setting.MajorVersion = (byte)GetInteger(GL.MAJOR_VERSION);
setting.MinorVersion = (byte)GetInteger(GL.MINOR_VERSION);
return(rc);
}
/// <summary>
/// Creates a context using custom settings.
/// </summary>
/// <param name="hWnd">The window handle to create the context on.</param>
/// <param name="settings">The custom context settings.</param>
/// <returns>Context</returns>
public static Context CreateContext(IntPtr hWnd, ContextSettings settings)
{
switch (Environment.OSVersion.Platform)
{
case PlatformID.Win32NT:
case PlatformID.Win32Windows:
return(ContextWin.CreateContext(hWnd, settings));
default:
throw new PlatformNotSupportedException();
}
}
/// <summary>
/// Creates a pre OpenGL 3.0 context.
/// </summary>
private void CreateOldContext()
{
if (Settings.Multisample == 0)
{
// create non-multisample context
CreateBaseContext();
MakeCurrent();
return;
}
// Replace Windows.Form with custom window library implementation.
Form tmpform = new Form();
ContextWin tmprc = new ContextWin(Settings, tmpform.Handle);
tmprc.CreateBaseContext();
// test multisampling and pixel format possibilities
if (!(WGLExtension.hasARB_pixel_format || WGLExtension.hasEXT_pixel_format))
{
// if the maximum multisample should be used on non-multisample device, create a simple context without multisample.
// if the number of samples is specified strictly on non-multisample device throw an exception.
if (Settings.Multisample != 0xFF)
{
throw new GLException(string.Format("ARB_pixel_format nor EXT_pixel_format is not supported."));
}
CreateBaseContext();
MakeCurrent();
return;
}
tmprc.Dispose();
tmpform.Close();
int[] pixelFormat = new int[100];
uint[] numFormats = new uint[1];
float[] fAttributes = new float[] { 0, 0 };
hDC = User32.GetDC(hWnd);
if (Settings.Multisample == 0xFF)
{
Settings.Multisample = (byte)GetInteger(GL.MAX_SAMPLES_EXT);
}
if (Settings.Multisample > 0) // Number of samples was specified or the HW supports MAX_SAMPLES_EXT for multisample = 0xFF
{
int[] attributes = GetAttributes(true);
bool valid = wgl.ChoosePixelFormat(hDC, attributes, fAttributes, 1, pixelFormat, numFormats);
if (valid && (numFormats[0] > 0))
{
if (!Gdi32.SetPixelFormat(hDC, pixelFormat[0], ref pfd))
{
throw GetException("SetPixelFormat failed");
}
}
}
else // Does not support MAX_SAMPLES_EXT
{
int[] attributes = GetAttributes(false);
bool valid = wgl.ChoosePixelFormat(hDC, attributes, fAttributes, 100, pixelFormat, numFormats);
if (valid && (numFormats[0] > 0))
{
int maxSamples = 0;
int maxSamplesFormat = 0;
int[] piAttributes = { WGL.SAMPLES_ARB };
int[] piValues = new int[1];
for (uint i = 0; i < Math.Min(100, numFormats[0]); i++)
{
wgl.GetPixelFormatAttribiv(hDC, pixelFormat[i], 0, 1, piAttributes, piValues);
if (piValues[0] > maxSamples)
{
maxSamples = piValues[0];
maxSamplesFormat = (int)i;
}
}
Settings.Multisample = (byte)maxSamples;
if (!Gdi32.SetPixelFormat(hDC, pixelFormat[maxSamplesFormat], ref pfd))
{
throw GetException("SetPixelFormat failed");
}
}
else
{
CreateBaseContext();
MakeCurrent();
return;
}
}
hRC = wgl.CreateContext(hDC);
MakeCurrent();
}
