[clutter/wip/cogl-winsys-egl: 14/30] add x11-foreign.c

[Robert Bragg <rbragg src gnome org>]

commit 22410cfae92e89f07c827707f0f87d3611255355
Author: Robert Bragg <robert linux intel com>
Date:   Mon Apr 18 15:38:25 2011 +0100

    add x11-foreign.c

 clutter/cogl/examples/x11-foreign.c |  136 +++++++++++++++++++++++++++++++++++
 1 files changed, 136 insertions(+), 0 deletions(-)
---
diff --git a/clutter/cogl/examples/x11-foreign.c b/clutter/cogl/examples/x11-foreign.c
new file mode 100644
index 0000000..d82e838
--- /dev/null
+++ b/clutter/cogl/examples/x11-foreign.c
@@ -0,0 +1,136 @@
+#include <cogl/cogl.h>
+#include <glib.h>
+#include <stdio.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+int
+main (int argc, char **argv)
+{
+  Display *xdpy;
+  CoglRenderer *renderer;
+  CoglSwapChain *chain;
+  CoglOnscreenTemplate *onscreen_template;
+  CoglDisplay *display;
+  CoglContext *ctx;
+  CoglOnscreen *onscreen;
+  CoglFramebuffer *fb;
+  GError *error = NULL;
+  guint32 visual;
+  XVisualInfo template, *xvisinfo;
+  int visinfos_count;
+  XSetWindowAttributes xattr;
+  unsigned long mask;
+  Window xwin;
+
+  /* Since we want to test external ownership of the X display,
+   * connect to X manually... */
+  xdpy = XOpenDisplay (NULL);
+  if (!xdpy)
+    {
+      fprintf (stderr, "Failed to open X Display\n");
+      return 1;
+    }
+
+  /* Conceptually choose a GPU... */
+  renderer = cogl_renderer_new ();
+  /* FIXME: This should conceptually be part of the configuration of
+   * a renderer. */
+  cogl_renderer_xlib_set_foreign_display (renderer, xdpy);
+  if (!cogl_renderer_connect (renderer, &error))
+    {
+      fprintf (stderr, "Failed to connect to a renderer: %s\n",
+               error->message);
+    }
+
+  chain = cogl_swap_chain_new ();
+  cogl_swap_chain_set_has_alpha (chain, TRUE);
+
+  /* Conceptually declare upfront the kinds of windows we anticipate
+   * creating so that when we configure the display pipeline we can avoid
+   * having an impedance miss-match between the format of windows and the
+   * format the display pipeline expects. */
+  onscreen_template = cogl_onscreen_template_new (chain);
+  cogl_object_unref (chain);
+
+  /* Conceptually setup a display pipeline */
+  display = cogl_display_new (renderer, onscreen_template);
+  cogl_object_unref (renderer);
+  if (!cogl_display_setup (display, &error))
+    {
+      fprintf (stderr, "Failed to setup a display pipeline: %s\n",
+               error->message);
+      return 1;
+    }
+
+  ctx = cogl_context_new (display, &error);
+  if (!ctx)
+    {
+      fprintf (stderr, "Failed to create context: %s\n", error->message);
+      return 1;
+    }
+  /* Eventually we want to get rid of any "default context" but for now it's
+   * needed...  */
+  cogl_set_default_context (ctx);
+
+  onscreen = cogl_onscreen_new (ctx, 640, 480);
+
+  /* We want to test that Cogl can handle foreign X windows... */
+
+  visual = cogl_onscreen_x11_get_visual_xid (onscreen);
+  if (!visual)
+    {
+      fprintf (stderr, "Failed to query an X visual suitable for the "
+               "configured CoglOnscreen framebuffer\n");
+      return 1;
+    }
+
+  template.visualid = visual;
+  xvisinfo = XGetVisualInfo (xdpy, VisualIDMask, &template, &visinfos_count);
+
+  /* window attributes */
+  xattr.background_pixel = WhitePixel (xdpy, DefaultScreen (xdpy));
+  xattr.border_pixel = 0;
+  xattr.colormap = XCreateColormap (xdpy,
+                                    DefaultRootWindow (xdpy),
+                                    xvisinfo->visual,
+                                    AllocNone);
+  mask = CWBorderPixel | CWColormap;
+
+  xwin = XCreateWindow (xdpy,
+                        DefaultRootWindow (xdpy),
+                        0, 0,
+                        800, 600,
+                        0,
+                        xvisinfo->depth,
+                        InputOutput,
+                        xvisinfo->visual,
+                        mask, &xattr);
+
+  XFree (xvisinfo);
+
+  cogl_onscreen_x11_set_foreign_window_xid (onscreen, xwin);
+
+  fb = COGL_FRAMEBUFFER (onscreen);
+  /* Eventually there will be an implicit allocate on first use so this
+   * will become optional... */
+  if (!cogl_framebuffer_allocate (fb, &error))
+    {
+      fprintf (stderr, "Failed to allocate framebuffer: %s\n", error->message);
+      return 1;
+    }
+
+  XMapWindow (xdpy, xwin);
+
+  cogl_push_framebuffer (fb);
+
+  cogl_set_source_color4f (1, 0, 0, 1);
+  for (;;)
+    {
+      cogl_rectangle (-1, 1, 1, -1);
+      cogl_framebuffer_swap_buffers (fb);
+    }
+
+  return 0;
+}