/// <summary>
/// Only valid to be called after the render context is created, this function attempts to
/// move the render context to the OpenGL version originally requested. If this is > 2.1, this
/// means building a new context. If this fails, we'll have to make do with 2.1.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
protected void UpdateContextVersion(OpenGL gl)
{
// If the request version number is anything up to and including 2.1, standard render contexts
// will provide what we need (as long as the graphics card drivers are up to date).
var requestedVersionNumber = VersionAttribute.GetVersionAttribute(requestedOpenGLVersion);
if (requestedVersionNumber.IsAtLeastVersion(3, 0) == false)
{
createdOpenGLVersion = requestedOpenGLVersion;
return;
}
// Now the none-trivial case. We must use the WGL_ARB_create_context extension to
// attempt to create a 3.0+ context.
try
{
int[] attributes =
{
OpenGL.WGL_CONTEXT_MAJOR_VERSION_ARB, requestedVersionNumber.Major,
OpenGL.WGL_CONTEXT_MINOR_VERSION_ARB, requestedVersionNumber.Minor,
OpenGL.WGL_CONTEXT_FLAGS_ARB, OpenGL.WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
var hrc = gl.CreateContextAttribsARB(IntPtr.Zero, attributes);
Win32.wglMakeCurrent(IntPtr.Zero, IntPtr.Zero);
Win32.wglDeleteContext(renderContextHandle);
Win32.wglMakeCurrent(deviceContextHandle, hrc);
renderContextHandle = hrc;
}
catch (Exception)
{
// TODO: can we actually get the real version?
createdOpenGLVersion = OpenGLVersion.OpenGL2_1;
}
}
/// <summary>
/// Only valid to be called after the render context is created, this function attempts to
/// move the render context to the OpenGL version originally requested. If this is > 2.1, this
/// means building a new context. If this fails, we'll have to make do with 2.1.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
protected void UpdateContextVersion()
{
// If the request version number is anything up to and including 2.1, standard render contexts
// will provide what we need (as long as the graphics card drivers are up to date).
var requestedVersionNumber = VersionAttribute.GetVersionAttribute(requestedOpenGLVersion);
if (requestedVersionNumber.IsAtLeastVersion(3, 0) == false)
{
createdOpenGLVersion = requestedOpenGLVersion;
return;
}
// Now the none-trivial case. We must use the WGL_ARB_create_context extension to
// attempt to create a 3.0+ context.
try
{
int[] attributes =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, requestedVersionNumber.Major,
WGL_CONTEXT_MINOR_VERSION_ARB, requestedVersionNumber.Minor,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
//// var hrc = gl.CreateContextAttribsARB(IntPtr.Zero, attributes);
IWindowInfo window_info = Utilities.CreateWindowsWindowInfo(IntPtr.Zero);
GraphicsMode mode = new GraphicsMode(DisplayDevice.Default.BitsPerPixel, 24, 0, 4, 0, 2, false);
GraphicsContext context = new GraphicsContext(mode, window_info, 1, 0, GraphicsContextFlags.Default);
Win32.wglMakeCurrent(IntPtr.Zero, IntPtr.Zero);
Win32.wglDeleteContext(renderContextHandle);
Win32.wglMakeCurrent(deviceContextHandle, hrc);
renderContextHandle = hrc;
}
catch (Exception)
{
// TODO: can we actually get the real version?
createdOpenGLVersion = OpenGLVersion.OpenGL2_1;
}
}