GLX demo app from http://glprogramming.com/blue/ch07.html#id5566579

.gitignore

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+glx-bare

Makefile

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+
+TARGET := glx-bare
+LDFLAGS := -lGL -lX11
+
+all: $(TARGET)

glx-bare.c

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+
+#include  <GL/glx.h>
+#include  <GL/gl.h>
+#include  <unistd.h>
+static int attributeList[] = { GLX_RGBA, 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;
+    /* get a connection */
+    dpy = XOpenDisplay(0);
+    /* get an appropriate visual */
+    vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeList);
+    /* create a GLX context */
+    cx = glXCreateContext(dpy, vi, 0, GL_FALSE);
+    /* 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();
+    /* wait a while */
+    sleep(10);
+}