1 /* cairo - a vector graphics library with display and print output
3 * Copyright © 2010 Linaro Limited
5 * This library is free software; you can redistribute it and/or
6 * modify it either under the terms of the GNU Lesser General Public
7 * License version 2.1 as published by the Free Software Foundation
8 * (the "LGPL") or, at your option, under the terms of the Mozilla
9 * Public License Version 1.1 (the "MPL"). If you do not alter this
10 * notice, a recipient may use your version of this file under either
11 * the MPL or the LGPL.
13 * You should have received a copy of the LGPL along with this library
14 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
16 * You should have received a copy of the MPL along with this library
17 * in the file COPYING-MPL-1.1
19 * The contents of this file are subject to the Mozilla Public License
20 * Version 1.1 (the "License"); you may not use this file except in
21 * compliance with the License. You may obtain a copy of the License at
22 * http://www.mozilla.org/MPL/
24 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
25 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
26 * the specific language governing rights and limitations.
29 * Alexandros Frantzis <alexandros.frantzis@linaro.org>
33 #include "cairo-gl-private.h"
36 _cairo_gl_get_version (void)
39 const char *version = (const char *) glGetString (GL_VERSION);
40 const char *dot = version == NULL ? NULL : strchr (version, '.');
41 const char *major_start = dot;
44 if (dot == NULL || dot == version || *(dot + 1) == '\0') {
48 /* Find the start of the major version in the string */
49 while (major_start > version && *major_start != ' ')
51 major = strtol (major_start, NULL, 10);
52 minor = strtol (dot + 1, NULL, 10);
55 return CAIRO_GL_VERSION_ENCODE (major, minor);
59 _cairo_gl_get_flavor (void)
61 const char *version = (const char *) glGetString (GL_VERSION);
62 cairo_gl_flavor_t flavor;
65 flavor = CAIRO_GL_FLAVOR_NONE;
66 else if (strstr (version, "OpenGL ES") != NULL)
67 flavor = CAIRO_GL_FLAVOR_ES;
69 flavor = CAIRO_GL_FLAVOR_DESKTOP;
75 _cairo_gl_has_extension (const char *ext)
77 const char *extensions = (const char *) glGetString (GL_EXTENSIONS);
78 size_t len = strlen (ext);
79 const char *ext_ptr = extensions;
81 if (unlikely (ext_ptr == NULL))
84 while ((ext_ptr = strstr (ext_ptr, ext)) != NULL) {
85 if (ext_ptr[len] == ' ' || ext_ptr[len] == '\0')
90 return (ext_ptr != NULL);