glXCreateGLXPixmap

NAME

glXCreateGLXPixmap - create an off-screen GLX rendering area

C SPECIFICATION

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

PARAMETERS

dpy ? Specifies the connection to the X server.

vis ? 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.

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

DESCRIPTION

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.

NOTES

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

ERRORS

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.