glXCreateGLXPixmap -- create an off-screen GLX rendering area


GLXPixmap glXCreateGLXPixmap(Display *dpy,
                             XVisualInfo *vis,
                             Pixmap pixmap)


Specifies the connection to the X server.

Specifies the visual that defines the structure of the rendering area. It is a pointer to an XVisualInfo structure, not a visual ID or a pointer to a Visual.

Specifies the X pixmap that will be used as the front left color buffer of the off-screen rendering area.


glXCreateGLXPixmap creates an off-screen rendering area and returns its XID. Any GLX rendering context that was created with respect to vis can be used to render into this off-screen area. Use glXMakeCurrent to associate the rendering area with a GLX rendering context.

The X pixmap identified by pixmap is used as the front left buffer of the resulting off-screen rendering area. All other buffers specified by vis, including color buffers other than the front left buffer, are created without externally visible names. GLX pixmaps with double-buffering are supported. However, glXSwapBuffers is ignored by these pixmaps.

Direct rendering contexts cannot be used to render into GLX pixmaps.


XVisualInfo is defined in Xutil.h. It is a structure that includes visual, visualID, screen, and depth elements.


BadMatch is generated if the depth of pixmap does not match the GLX_BUFFER_SIZE value of vis, or if pixmap was not created with respect to the same screen as vis.

BadValue is generated if vis is not a valid XVisualInfo pointer (e.g., if the GLX implementation does not support this visual).

BadPixmap is generated if pixmap is not a valid pixmap.

BadAlloc is generated if the server cannot allocate the GLX pixmap.


glXCreateContext, glXIsDirect, glXMakeCurrent

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© 1995 Uwe Behrens All rights reserved