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 | |
30 | /** |
31 | * If we can determine the GLX version from the current context, then |
32 | * return that, otherwise return a version that will just send us on |
33 | * to dlsym() or get_proc_address(). |
34 | */ |
35 | int |
36 | epoxy_conservative_glx_version(void) |
37 | { |
38 | Display *dpy = glXGetCurrentDisplay(); |
39 | GLXContext ctx = glXGetCurrentContext(); |
40 | int screen; |
41 | |
42 | if (!dpy || !ctx) |
43 | return 14; |
44 | |
45 | glXQueryContext(dpy, ctx, GLX_SCREEN, &screen); |
46 | |
47 | return epoxy_glx_version(dpy, screen); |
48 | } |
49 | |
50 | |
51 | /** |
52 | * @brief Returns the version of GLX we are using |
53 | * |
54 | * The version is encoded as: |
55 | * |
56 | * ``` |
57 | * |
58 | * version = major * 10 + minor |
59 | * |
60 | * ``` |
61 | * |
62 | * So it can be easily used for version comparisons. |
63 | * |
64 | * @param dpy The X11 display |
65 | * @param screen The X11 screen |
66 | * |
67 | * @return The encoded version of GLX we are using |
68 | * |
69 | * @see epoxy_gl_version() |
70 | */ |
71 | int |
72 | epoxy_glx_version(Display *dpy, int screen) |
73 | { |
74 | int server_major, server_minor; |
75 | int client_major, client_minor; |
76 | int server, client; |
77 | const char *version_string; |
78 | int ret; |
79 | |
80 | version_string = glXQueryServerString(dpy, screen, GLX_VERSION); |
81 | if (!version_string) |
82 | return 0; |
83 | |
84 | ret = sscanf(s: version_string, format: "%d.%d" , &server_major, &server_minor); |
85 | assert(ret == 2); |
86 | server = server_major * 10 + server_minor; |
87 | |
88 | version_string = glXGetClientString(dpy, GLX_VERSION); |
89 | if (!version_string) |
90 | return 0; |
91 | |
92 | ret = sscanf(s: version_string, format: "%d.%d" , &client_major, &client_minor); |
93 | assert(ret == 2); |
94 | client = client_major * 10 + client_minor; |
95 | |
96 | if (client < server) |
97 | return client; |
98 | else |
99 | return server; |
100 | } |
101 | |
102 | /** |
103 | * If we can determine the GLX extension support from the current |
104 | * context, then return that, otherwise give the answer that will just |
105 | * send us on to get_proc_address(). |
106 | */ |
107 | bool |
108 | epoxy_conservative_has_glx_extension(const char *ext) |
109 | { |
110 | Display *dpy = glXGetCurrentDisplay(); |
111 | GLXContext ctx = glXGetCurrentContext(); |
112 | int screen; |
113 | |
114 | if (!dpy || !ctx) |
115 | return true; |
116 | |
117 | glXQueryContext(dpy, ctx, GLX_SCREEN, &screen); |
118 | |
119 | return epoxy_has_glx_extension(dpy, screen, extension: ext); |
120 | } |
121 | |
122 | /** |
123 | * @brief Returns true if the given GLX extension is supported in the current context. |
124 | * |
125 | * @param dpy The X11 display |
126 | * @param screen The X11 screen |
127 | * @param extension The name of the GLX extension |
128 | * |
129 | * @return `true` if the extension is available |
130 | * |
131 | * @see epoxy_has_gl_extension() |
132 | * @see epoxy_has_egl_extension() |
133 | */ |
134 | bool |
135 | epoxy_has_glx_extension(Display *dpy, int screen, const char *ext) |
136 | { |
137 | /* No, you can't just use glXGetClientString or |
138 | * glXGetServerString() here. Those each tell you about one half |
139 | * of what's needed for an extension to be supported, and |
140 | * glXQueryExtensionsString() is what gives you the intersection |
141 | * of the two. |
142 | */ |
143 | return epoxy_extension_in_string(glXQueryExtensionsString(dpy, screen), ext); |
144 | } |
145 | |
146 | /** |
147 | * @brief Checks whether GLX is available. |
148 | * |
149 | * @param dpy The X11 display |
150 | * |
151 | * @return `true` if GLX is available |
152 | * |
153 | * @newin{1,4} |
154 | */ |
155 | bool |
156 | epoxy_has_glx(Display *dpy) |
157 | { |
158 | #if !PLATFORM_HAS_GLX |
159 | return false; |
160 | #else |
161 | if (epoxy_load_glx(false, true)) { |
162 | Bool (* pf_glXQueryExtension) (Display *, int *, int *); |
163 | int error_base, event_base; |
164 | |
165 | pf_glXQueryExtension = epoxy_conservative_glx_dlsym(name: "glXQueryExtension" , false); |
166 | if (pf_glXQueryExtension && pf_glXQueryExtension(dpy, &error_base, &event_base)) |
167 | return true; |
168 | } |
169 | |
170 | return false; |
171 | #endif /* !PLATFORM_HAS_GLX */ |
172 | } |
173 | |