add glx-dbl-bare, in progress

glx-dbl-bare/Makefile

@@ -0,0 +1,8 @@
+
+TARGET := glx-dbl-bare
+LDFLAGS := -lGL -lX11
+
+all: $(TARGET)
+
+clean:
+	-rm -f *.o $(TARGET)

glx-dbl-bare/glx-dbl-bare.c

@@ -0,0 +1,50 @@
+
+#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);
+}