HP c3700 - Workstation, Reference Manual, Page: 239 / 486

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glXIntro
Chapter 9
239
GLX_RGBA,
GLX_DOUBLE_BUFFER, /*In case single buffering is not supported*/
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
None};
static Bool WaitForNotify(Display *d, XEvent *e, char *arg) {
return (e->type == MapNotify) && (e->xmap.window == (Window)arg);
}
int main(int argc, char **argv) {
Display *dpy;
XVisualInfo *vi;
Colormap cmap;
XSetWindowAttributes swa;
Window win;
GLXContext cx;
XEvent event;
int swap_flag = FALSE;
/* get a connection */
dpy = XOpenDisplay(0);
/* get an appropriate visual */
vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeListSgl);
if (vi == NULL) {
vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeListDbl);
swap_flag = TRUE;
}
/* create a GLX context */
cx = glXCreateContext(dpy, vi, 0, GL_TRUE);
/* create a color map */
cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
vi->visual, AllocNone);
/* create a window */
swa.colormap = cmap;
swa.border_pixel = 0;
swa.event_mask = StructureNotifyMask;
win = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 0, 0, 100, 100,
0, vi->depth, InputOutput, vi->visual,
CWBorderPixel|CWColormap|CWEventMask, &swa);
XMapWindow(dpy, win);
XIfEvent(dpy, &event, WaitForNotify, (char*)win);
/* connect the context to the window */
glXMakeCurrent(dpy, win, cx);
/* clear the buffer */
glClearColor(1,1,0,1);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
if (swap_flag) glXSwapBuffers(dpy,win);