+ return disabled_exts.count(ext);
+}
+
+GLApi get_gl_api()
+{
+#ifdef GL_ES_VERSION_2_0
+ return OPENGL_ES2;
+#else
+ return OPENGL;
+#endif
+}
+
+inline GLProfile _get_gl_profile()
+{
+ if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
+ {
+ int mask;
+ glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
+ if(mask==GL_CONTEXT_CORE_PROFILE_BIT)
+ return CORE_PROFILE;
+ }
+
+ return COMPATIBILITY_PROFILE;
+}
+
+GLProfile get_gl_profile()
+{
+ static GLProfile profile = _get_gl_profile();
+ return profile;
+}
+
+inline Version _get_gl_version()
+{
+ const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
+ if(!gl_ver_ptr)
+ throw runtime_error("OpenGL version not available");
+
+ string gl_ver = gl_ver_ptr;
+ if(!gl_ver.compare(0, 10, "OpenGL ES "))
+ gl_ver.erase(0, 10);
+
+ Version ver(gl_ver.substr(0, gl_ver.find(' ')));
+
+ if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
+ {
+ Version force_ver(force_ver_ptr);
+ if(!(force_ver>=ver))
+ ver = force_ver;
+ }
+
+ return ver;
+}
+
+const Version &get_gl_version()
+{
+ static Version version = _get_gl_version();