1/*
2 * Copyright © 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include <assert.h>
25#include <string.h>
26#include <stdio.h>
27
28#include "dispatch_common.h"
29
30int
31epoxy_conservative_egl_version(void)
32{
33    EGLDisplay dpy = eglGetCurrentDisplay();
34
35    if (!dpy)
36        return 14;
37
38    return epoxy_egl_version(dpy);
39}
40
41/**
42 * @brief Returns the version of OpenGL we are using
43 *
44 * The version is encoded as:
45 *
46 * ```
47 *
48 *   version = major * 10 + minor
49 *
50 * ```
51 *
52 * So it can be easily used for version comparisons.
53 *
54 * @param The EGL display
55 *
56 * @return The encoded version of EGL we are using
57 *
58 * @see epoxy_gl_version()
59 */
60int
61epoxy_egl_version(EGLDisplay dpy)
62{
63    int major, minor;
64    const char *version_string;
65    int ret;
66
67    version_string = eglQueryString(dpy, EGL_VERSION);
68    if (!version_string)
69        return 0;
70
71    ret = sscanf(version_string, "%d.%d", &major, &minor);
72    assert(ret == 2);
73    return major * 10 + minor;
74}
75
76bool
77epoxy_conservative_has_egl_extension(const char *ext)
78{
79    return epoxy_has_egl_extension(eglGetCurrentDisplay(), ext);
80}
81
82/**
83 * @brief Returns true if the given EGL extension is supported in the current context.
84 *
85 * @param dpy The EGL display
86 * @param extension The name of the EGL extension
87 *
88 * @return `true` if the extension is available
89 *
90 * @see epoxy_has_gl_extension()
91 * @see epoxy_has_glx_extension()
92 */
93bool
94epoxy_has_egl_extension(EGLDisplay dpy, const char *ext)
95{
96    return epoxy_extension_in_string(eglQueryString(dpy, EGL_EXTENSIONS), ext) || epoxy_extension_in_string(eglQueryString(NULL, EGL_EXTENSIONS), ext);
97}
98
99/**
100 * @brief Checks whether EGL is available.
101 *
102 * @return `true` if EGL is available
103 *
104 * @newin{1,4}
105 */
106bool
107epoxy_has_egl(void)
108{
109#if !PLATFORM_HAS_EGL
110    return false;
111#else
112    if (epoxy_load_egl(false, true)) {
113        EGLDisplay* (* pf_eglGetCurrentDisplay) (void);
114
115        pf_eglGetCurrentDisplay = epoxy_conservative_egl_dlsym("eglGetCurrentDisplay", false);
116        if (pf_eglGetCurrentDisplay)
117            return true;
118    }
119
120    return false;
121#endif /* PLATFORM_HAS_EGL */
122}
123