create_destroy_context_with_drawable_2.c [plain text]
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <unistd.h>
int main() {
Display *dpy;
int attrib[] = { GLX_RGBA,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_DOUBLEBUFFER,
None };
int eventbase, errorbase;
int screen;
Window root, win;
XVisualInfo *visinfo;
XSetWindowAttributes attr;
GLXContext ctx;
int iter;
unsigned int p;
dpy = XOpenDisplay(NULL);
if(NULL == dpy) {
fprintf(stderr, "error: unable to open display!\n");
return EXIT_FAILURE;
}
if(!glXQueryExtension(dpy, &eventbase, &errorbase)) {
fprintf(stderr, "GLX is not available!\n");
return EXIT_FAILURE;
}
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
visinfo = glXChooseVisual(dpy, screen, attrib);
if(!visinfo) {
fprintf(stderr, "error: couldn't get an RGBA, double-buffered visual!\n");
return EXIT_FAILURE;
}
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask;
win = XCreateWindow(dpy, root, 0, 0,
400, 400,
0, visinfo->depth, InputOutput,
visinfo->visual,
CWBackPixel | CWBorderPixel | CWColormap | CWEventMask,
&attr);
p = (unsigned int)getpid();
printf("pid %u\n", p);
while(1) {
ctx = glXCreateContext(dpy, visinfo, NULL, True );
if(!ctx) {
fprintf(stderr, "error: glXCreateContext failed!\n");
return EXIT_FAILURE;
}
glXMakeCurrent(dpy, win, ctx);
glXDestroyContext(dpy, ctx);
glXMakeCurrent(dpy, None, NULL);
sleep(1);
}
return EXIT_SUCCESS;
}