[cogl] cogland: Add an option to split the desktop into four outputs

[Neil Roberts <nroberts src gnome org>]

commit 5570bf892268c8d2ea36bc26473aeb607c0e2c1d
Author: Neil Roberts <neil linux intel com>
Date:   Wed Mar 20 16:53:23 2013 +0000

    cogland: Add an option to split the desktop into four outputs
    
    Previously Cogland would always split the desktop into four outputs.
    Although this is quite neat to demonstrate that it's possible, it's
    quite annoying in practice while testing. This patch turns it into a
    command line option which defaults to off.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 examples/cogland.c |   66 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 61 insertions(+), 5 deletions(-)
---
diff --git a/examples/cogland.c b/examples/cogland.c
index 3835ba9..90055d6 100644
--- a/examples/cogland.c
+++ b/examples/cogland.c
@@ -2,6 +2,7 @@
 #include <cogl/cogl-wayland-server.h>
 #include <glib.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/time.h>
 #include <string.h>
 
@@ -109,6 +110,47 @@ struct _CoglandCompositor
   GList *surfaces;
 };
 
+static CoglBool option_multiple_outputs = FALSE;
+
+static GOptionEntry
+options[] =
+  {
+    {
+      "multiple", 'm', 0, G_OPTION_ARG_NONE, &option_multiple_outputs,
+      "Split the compositor into four outputs", NULL
+    },
+    { NULL, 0, 0, 0, NULL, NULL, NULL }
+  };
+
+static CoglBool
+process_arguments (int *argc, char ***argv,
+                   GError **error)
+{
+  GOptionContext *context;
+  CoglBool ret;
+  GOptionGroup *group;
+
+  group = g_option_group_new (NULL, /* name */
+                              NULL, /* description */
+                              NULL, /* help_description */
+                              NULL, /* user_data */
+                              NULL /* destroy notify */);
+  g_option_group_add_entries (group, options);
+  context = g_option_context_new ("- An example Wayland compositor using Cogl");
+  g_option_context_set_main_group (context, group);
+  ret = g_option_context_parse (context, argc, argv, error);
+  g_option_context_free (context);
+
+  if (ret && *argc > 1)
+    {
+      g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
+                   "Unknown option '%s'", (* argv)[1]);
+      ret = FALSE;
+    }
+
+  return ret;
+}
+
 static uint32_t
 get_time (void)
 {
@@ -954,6 +996,7 @@ main (int argc, char **argv)
   CoglandCompositor compositor;
   GMainLoop *loop;
   CoglError *error = NULL;
+  GError *gerror = NULL;
   CoglVertexP2C4 triangle_vertices[] = {
       {0, 0.7, 0xff, 0x00, 0x00, 0x80},
       {-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
@@ -961,6 +1004,12 @@ main (int argc, char **argv)
   };
   GSource *cogl_source;
 
+  if (!process_arguments (&argc, &argv, &gerror))
+    {
+      fprintf (stderr, "%s\n", gerror->message);
+      return EXIT_FAILURE;
+    }
+
   memset (&compositor, 0, sizeof (compositor));
 
   compositor.wayland_display = wl_display_create ();
@@ -995,11 +1044,18 @@ main (int argc, char **argv)
   compositor.virtual_width = 640;
   compositor.virtual_height = 480;
 
-  /* Emulate compositing with multiple monitors... */
-  cogland_compositor_create_output (&compositor, 0, 0, 320, 240);
-  cogland_compositor_create_output (&compositor, 320, 0, 320, 240);
-  cogland_compositor_create_output (&compositor, 0, 240, 320, 240);
-  cogland_compositor_create_output (&compositor, 320, 240, 320, 240);
+  if (option_multiple_outputs)
+    {
+      /* Emulate compositing with multiple monitors... */
+      cogland_compositor_create_output (&compositor, 0, 0, 320, 240);
+      cogland_compositor_create_output (&compositor, 320, 0, 320, 240);
+      cogland_compositor_create_output (&compositor, 0, 240, 320, 240);
+      cogland_compositor_create_output (&compositor, 320, 240, 320, 240);
+    }
+  else
+    {
+      cogland_compositor_create_output (&compositor, 0, 0, 640, 480);
+    }
 
   if (wl_display_add_global (compositor.wayland_display, &wl_shell_interface,
                              &compositor, bind_shell) == NULL)