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#include <X11/X.h>
#include <X11/Xlib.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <assert.h>
#include <unistd.h>
#include <stdio.h>
//
// gcc -g -Wall -o makecurrenttest makecurrenttest.c -lX11 -lGL
//
static Window make_rgb_db_window( Display *dpy, XVisualInfo *visinfo,
unsigned int width, unsigned int height )
{
int scrnum;
XSetWindowAttributes attr;
unsigned long mask;
Window root;
Window win;
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );
/* window attributes */
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
win = XCreateWindow( dpy, root, 0, 0, width, height,
0, visinfo->depth, InputOutput,
visinfo->visual, mask, &attr );
return win;
}
int main()
{
int i;
// Open the display
Display *dpy = XOpenDisplay(NULL);
assert(dpy);
int attrib[] = { GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None };
XVisualInfo *visinfo;
visinfo = glXChooseVisual( dpy, DefaultScreen(dpy), attrib );
if (!visinfo) {
printf("Error: couldn't get an RGB, Double-buffered visual\n");
assert(0);
}
for (i=0; i < 2; i++)
{
// Create the window
Window w = make_rgb_db_window(dpy,visinfo,200,100);
// Map the window
XMapWindow(dpy, w);
// Create context
GLXContext ctx = glXCreateContext(dpy, visinfo, NULL, True );
if (!ctx) {
printf("Error: glXCreateContext failed\n");
assert(0);
}
// Make current
glXMakeCurrent(dpy, w, ctx);
// Destroy window
XDestroyWindow(dpy, w);
}
return 0;
}
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