forked from KolibriOS/kolibrios
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2010 Linaro Limited
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* Contributor(s):
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* Alexandros Frantzis <alexandros.frantzis@linaro.org>
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*/
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#include "cairoint.h"
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#include "cairo-gl-private.h"
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int
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_cairo_gl_get_version (void)
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{
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int major, minor;
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const char *version = (const char *) glGetString (GL_VERSION);
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const char *dot = version == NULL ? NULL : strchr (version, '.');
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const char *major_start = dot;
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/* Sanity check */
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if (dot == NULL || dot == version || *(dot + 1) == '\0') {
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major = 0;
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minor = 0;
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} else {
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/* Find the start of the major version in the string */
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while (major_start > version && *major_start != ' ')
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--major_start;
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major = strtol (major_start, NULL, 10);
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minor = strtol (dot + 1, NULL, 10);
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}
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return CAIRO_GL_VERSION_ENCODE (major, minor);
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}
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cairo_gl_flavor_t
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_cairo_gl_get_flavor (void)
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{
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const char *version = (const char *) glGetString (GL_VERSION);
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cairo_gl_flavor_t flavor;
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if (version == NULL)
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flavor = CAIRO_GL_FLAVOR_NONE;
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else if (strstr (version, "OpenGL ES") != NULL)
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flavor = CAIRO_GL_FLAVOR_ES;
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else
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flavor = CAIRO_GL_FLAVOR_DESKTOP;
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return flavor;
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}
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cairo_bool_t
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_cairo_gl_has_extension (const char *ext)
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{
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const char *extensions = (const char *) glGetString (GL_EXTENSIONS);
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size_t len = strlen (ext);
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const char *ext_ptr = extensions;
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if (unlikely (ext_ptr == NULL))
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return 0;
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while ((ext_ptr = strstr (ext_ptr, ext)) != NULL) {
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if (ext_ptr[len] == ' ' || ext_ptr[len] == '\0')
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break;
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ext_ptr += len;
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}
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return (ext_ptr != NULL);
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}
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