HP b2600 Reference Manual page 240

I
glXIntro
}
Notes
A color map must be created and passed to XCreateWindow. See the preceding example
code.
A GLX context must be created and attached to an X drawable before OpenGL
commands can be executed.
OpenGL commands issued while no context/drawable pair is current result in undefined
behavior.
Exposure events indicate that all buffers associated with the specified window may be
damaged and should be repainted. Although certain buffers of some visuals on some
systems may never require repainting (the depth buffer, for example), it is incorrect to
write a program assuming that these buffers will not be damaged.
GLX commands manipulate XVisualInfo structures rather than pointers to visuals or
visual IDs. XVisualInfo structures contain visual, visualID, screen, and depth elements,
as well as other X-specific information.
Using GLX Extensions
All supported GLX extensions will have a corresponding definition in glx.h and a token
in the extension string returned by glXQueryExtensionsString. For example, if the
EXT_visual_info extension is supported, then this token will be defined in glx.h and
EXT_visual_info will appear in the extension string returned by
glXQueryExtensionsString. The definitions in glx.h can be used at compile time to
determine if procedure calls corresponding to an extension exist in the library.
GLX 1.1 and GLX 1.2
GLX 1.2 is now supported. It is backward compatible with GLX 1.1 and GLX 1.0.
GLX 1.2 corresponds to OpenGL version 1.1 and introduces the following new call:
glXGetCurrentDisplay.
GLX 1.1 corresponds to OpenGL version 1.0 and introduces the following new calls:
glXQueryExtensionsString, glXQueryServerString, and glXGetClientString.
Call glXQueryVersion to determine at runtime what version of GLX is available.
glXQueryVersion returns the version that is supported on the connection. Thus if 1.2 is
returned, both the client and server support GLX 1.2. You can also check the GLX
version at compile time: GLX_VERSION_1_1 will be defined in glx.h if GLX 1.1 calls are
supported and GLX_VERSION_1_2 will be defined if GLX 1.2 calls are supported.
See Also
glFinish,
glFlush,
glXChooseVisual,
glXCopyContext,
glXCreateContext,
240
/* wait a while */
sleep(10);
Chapter 9