Add a CGL test for the Epoxy API

Just like the one we use for EGL.

test/cgl_epoxy_api.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018  Emmanuele Bassi
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * @file cgl_epoxy_api.c
+ *
+ * Tests the Epoxy API using the CoreGraphics OpenGL framework.
+ */
+
+#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;
+    const char *string;
+    bool pass = true;
+    int npix;
+    GLint shader;
+
+    CGLChoosePixelFormat(attribs, &pix, &npix);
+    CGLCreateContext(pix, (void *) 0, &ctx);
+    CGLSetCurrentContext(ctx);
+
+    if (!epoxy_is_desktop_gl()) {
+        fputs("Claimed not to be desktop\n", stderr);
+        pass = false;
+    }
+
+    if (epoxy_gl_version() < 20) {
+        fprintf(stderr, "Claimed to be GL version %d\n",
+                epoxy_gl_version());
+        pass = false;
+    }
+
+    if (epoxy_glsl_version() < 100) {
+        fprintf(stderr, "Claimed to have GLSL version %d\n",
+                epoxy_glsl_version());
+        pass = false;
+    }
+
+    string = (const char *)glGetString(GL_VERSION);
+    printf("GL version: %s - Epoxy: %d\n", string, epoxy_gl_version());
+
+    string = (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
+    printf("GLSL version: %s - Epoxy: %d\n", string, epoxy_glsl_version());
+
+    shader = glCreateShader(GL_FRAGMENT_SHADER);
+    pass = glIsShader(shader);
+
+    CGLSetCurrentContext(NULL);
+    CGLReleaseContext(ctx);
+    CGLReleasePixelFormat(pix);
+
+    return pass != true;
+}

test/meson.build

@@ -159,6 +159,7 @@ if host_machine.system().contains('darwin')
 
   cgl_tests = [
     [ 'cgl_core', [ 'cgl_core.c' ] ],
+    [ 'cgl_epoxy_api', [ 'cgl_epoxy_api.c' ] ],
   ]
 
   foreach t: cgl_tests