/// <summary>
/// Creates a context, specifying attributes.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <param name="attribsList">
/// A <see cref="T:Int32[]"/> that specifies the attributes list.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <see cref="attribsList"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="attribsList"/> length is zero or if the last item of <paramref name="attribsList"/>
/// is not zero.
/// </exception>
public override IntPtr CreateContextAttrib(IntPtr sharedContext, int[] attribsList)
{
if (attribsList == null)
{
throw new ArgumentNullException("attribsList");
}
if (attribsList.Length == 0)
{
throw new ArgumentException("zero length array", "attribsList");
}
if (attribsList[attribsList.Length - 1] != 0)
{
throw new ArgumentException("not zero-terminated array", "attribsList");
}
using (Glx.XLock displayLock = new Glx.XLock(Display)) {
return(Glx.CreateContextAttribsARB(Display, FBConfig, sharedContext, true, attribsList));
}
}
/// <summary>
/// Creates a context, specifying attributes.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <param name="attribsList">
/// A <see cref="T:Int32[]"/> that specifies the attributes list.
/// </param>
/// <param name="api">
/// A <see cref="KhronosVersion"/> that specifies the API to be implemented by the returned context. It can be null indicating the
/// default API for this DeviceContext implementation. If it is possible, try to determine the API version also.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <see cref="attribsList"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="attribsList"/> length is zero or if the last item of <paramref name="attribsList"/>
/// is not zero.
/// </exception>
public override IntPtr CreateContextAttrib(IntPtr sharedContext, int[] attribsList, KhronosVersion api)
{
if (api != null && api.Api != KhronosVersion.ApiGl)
{
List <int> adulteredAttribs = new List <int>(attribsList);
// Support check
switch (api.Api)
{
case KhronosVersion.ApiGles1:
case KhronosVersion.ApiGles2:
if (Glx.CurrentExtensions.CreateContextEsProfile_EXT == false)
{
throw new NotSupportedException("OpenGL ES API not supported");
}
break;
default:
throw new NotSupportedException(String.Format("'{0}' API not supported", api.Api));
}
// Remove trailing 0
if (adulteredAttribs.Count > 0 && adulteredAttribs[adulteredAttribs.Count - 1] == Gl.NONE)
{
adulteredAttribs.RemoveAt(adulteredAttribs.Count - 1);
}
// Add required attributes
int majorVersionIndex = adulteredAttribs.FindIndex(delegate(int item) { return(item == Gl.MAJOR_VERSION); });
int minorVersionIndex = adulteredAttribs.FindIndex(delegate(int item) { return(item == Gl.MINOR_VERSION); });
int profileMaskIndex = adulteredAttribs.FindIndex(delegate(int item) { return(item == Gl.CONTEXT_PROFILE_MASK); });
if (majorVersionIndex < 0)
{
adulteredAttribs.AddRange(new int[] { Gl.MAJOR_VERSION, api.Major });
majorVersionIndex = adulteredAttribs.Count - 2;
}
if (minorVersionIndex < 0)
{
adulteredAttribs.AddRange(new int[] { Gl.MINOR_VERSION, api.Minor });
minorVersionIndex = adulteredAttribs.Count - 2;
}
if (profileMaskIndex < 0)
{
adulteredAttribs.AddRange(new int[] { Gl.CONTEXT_PROFILE_MASK, 0 });
profileMaskIndex = adulteredAttribs.Count - 2;
}
switch (api.Api)
{
case KhronosVersion.ApiGles1:
// Ignore API version: force always to 1.0
adulteredAttribs[majorVersionIndex + 1] = 1;
adulteredAttribs[minorVersionIndex + 1] = 1;
adulteredAttribs[profileMaskIndex + 1] |= (int)Glx.CONTEXT_ES_PROFILE_BIT_EXT;
break;
case KhronosVersion.ApiGles2:
// Uses API version: it may be greater than 2.0(?)
adulteredAttribs[majorVersionIndex + 1] = api.Major;
adulteredAttribs[minorVersionIndex + 1] = api.Minor;
adulteredAttribs[profileMaskIndex + 1] |= (int)Glx.CONTEXT_ES_PROFILE_BIT_EXT;
break;
default:
throw new NotSupportedException(String.Format("'{0}' API not supported", api.Api));
}
// Restore trailing 0
adulteredAttribs.Add(Gl.NONE);
using (Glx.XLock displayLock = new Glx.XLock(Display)) {
Debug.Assert(_FBConfig != IntPtr.Zero, "SetPixelFormat not executed");
return(Glx.CreateContextAttribsARB(Display, _FBConfig, sharedContext, true, adulteredAttribs.ToArray()));
}
}
else
{
using (Glx.XLock displayLock = new Glx.XLock(Display)) {
Debug.Assert(_FBConfig != IntPtr.Zero, "SetPixelFormat not executed");
return(Glx.CreateContextAttribsARB(Display, _FBConfig, sharedContext, true, attribsList));
}
}
}
