Add a CoreGraphics OpenGL test for macOS

A basic test, to check that we're actually capable of working on macOS
without GLX enabled.

test/cgl_core.c

@@ -0,0 +1,54 @@
+/* This is a copy of the test used by HomeBrew's libepoxy recipe,
+ * originally written by Mikko Lehtonen.
+ *
+ * The Homebrew recipe is released under the BSD 2-Clause license.
+ *
+ * Copyright (c) 2009-present, Homebrew contributors
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <epoxy/gl.h>
+#include <Carbon/Carbon.h>
+#include <OpenGL/OpenGL.h>
+#include <OpenGL/CGLTypes.h>
+#include <OpenGL/CGLCurrent.h>
+#include <OpenGL/CGLContext.h>
+
+int
+main (void)
+{
+    CGLPixelFormatAttribute attribs[] = {0};
+    CGLPixelFormatObj pix;
+    CGLContextObj ctx;
+    int npix;
+
+    CGLChoosePixelFormat(attribs, &pix, &npix);
+    CGLCreateContext(pix, (void *) 0, &ctx);
+
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    CGLReleaseContext(ctx);
+    CGLReleasePixelFormat(pix);
+
+    return 0;
+}

test/meson.build

@@ -152,3 +152,26 @@ if build_wgl
     test(test_name, test_bin)
   endforeach
 endif
+
+# Apple
+if host_machine.system().contains('darwin')
+  opengl_dep = dependency('appleframeworks', modules: ['OpenGL', 'Carbon'], required: true)
+
+  cgl_tests = [
+    [ 'cgl_core', [ 'cgl_core.c' ] ],
+  ]
+
+  foreach t: cgl_tests
+    test_name = t[0]
+    test_sources = t[1]
+
+    test(test_name,
+      executable(
+        test_name, test_sources,
+        c_args: test_cflags,
+        include_directories: libepoxy_inc,
+        dependencies: [ libepoxy_dep, opengl_dep ],
+      ),
+    )
+  endforeach
+endif