examples/gl_basic: Add support for CGL

The example was verified to work on MacOS 10.7.

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 3578708..df94cf0 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -4,3 +4,10 @@
 
 add_executable(gl_basic gl_basic.c)
 target_link_libraries(gl_basic waffle)
+
+if("${CMAKE_SYSTEM_NAME}" STREQUAL Darwin)
+    set_target_properties(gl_basic
+        PROPERTIES
+        COMPILE_FLAGS "-ObjC"
+        )
+endif()
diff --git a/examples/gl_basic.c b/examples/gl_basic.c
index 5a4d9e9..f92d491 100644
--- a/examples/gl_basic.c
+++ b/examples/gl_basic.c
@@ -30,6 +30,10 @@
 #include <string.h>
 #include <time.h>
 
+#ifdef __APPLE__
+#    include <Cocoa/Cocoa.h>
+#endif
+
 #include <waffle/waffle.h>
 
 static const char *usage_message =
@@ -245,6 +249,37 @@ draw(struct waffle_window *window)
     return true;
 }
 
+#ifdef __APPLE__
+
+static NSAutoreleasePool *pool;
+
+static void
+cocoa_init(void)
+{
+    // From the NSApplication Class Reference:
+    //     [...] if you do need to use Cocoa classes within the main()
+    //     function itself (other than to load nib files or to instantiate
+    //     NSApplication), you should create an autorelease pool before using
+    //     the classes and then release the pool when you’re done.
+    pool = [[NSAutoreleasePool alloc] init];
+
+    // From the NSApplication Class Reference:
+    //     The sharedApplication class method initializes the display
+    //     environment and connects your program to the window server and the
+    //     display server.
+    //
+    // It also creates the singleton NSApp if it does not yet exist.
+    [NSApplication sharedApplication];
+}
+
+static void
+cocoa_finish(void)
+{
+    [pool drain];
+}
+
+#endif // __APPLE__
+
 int
 main(int argc, char **argv)
 {
@@ -261,6 +296,10 @@ main(int argc, char **argv)
     struct waffle_context *ctx;
     struct waffle_window *window;
 
+    #ifdef __APPLE__
+        cocoa_init();
+    #endif
+
     ok = parse_args(argc, argv, &opts);
     if (!ok)
         exit(EXIT_FAILURE);
@@ -339,5 +378,9 @@ main(int argc, char **argv)
     if (!ok)
         error_waffle();
 
+    #ifdef __APPLE__
+        cocoa_finish();
+    #endif
+
     return EXIT_SUCCESS;
 }