1 /*
2 * Copyright © 2011 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
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <string.h>
25 #include <ctype.h>
26
27 #include "glxclient.h"
28 #include <xcb/glx.h>
29 #include <X11/Xlib-xcb.h>
30
31 _X_HIDDEN void
__glX_send_client_info(struct glx_display * glx_dpy)32 __glX_send_client_info(struct glx_display *glx_dpy)
33 {
34 const unsigned ext_length = strlen("GLX_ARB_create_context");
35 const unsigned prof_length = strlen("_profile");
36 char *gl_extension_string;
37 int gl_extension_length;
38 xcb_connection_t *c;
39 Bool any_screen_has_ARB_create_context = False;
40 Bool any_screen_has_ARB_create_context_profile = False;
41 unsigned i;
42 static const uint32_t gl_versions[] = {
43 1, 4,
44 };
45 static const uint32_t gl_versions_profiles[] = {
46 1, 4, 0x00000000,
47 };
48 static const char glx_extensions[] =
49 "GLX_ARB_create_context GLX_ARB_create_context_profile";
50
51 /* There are three possible flavors of the client info structure that the
52 * client could send to the server. The version sent depends on the
53 * combination of GLX versions and extensions supported by the client and
54 * the server.
55 *
56 * Server supports Client sends
57 * ----------------------------------------------------------------------
58 * GLX version = 1.0 Nothing.
59 *
60 * GLX version >= 1.1 struct GLXClientInfo
61 *
62 * GLX version >= 1.4 and
63 * GLX_ARB_create_context struct glXSetClientInfoARB
64 *
65 * GLX version >= 1.4 and
66 * GLX_ARB_create_context_profile struct glXSetClientInfo2ARB
67 *
68 * GLX_ARB_create_context and GLX_ARB_create_context_profile use FBConfigs,
69 * and these only exist in GLX 1.4 or with GLX_SGIX_fbconfig. I can't
70 * imagine an implementation that supports GLX_SGIX_fbconfig and
71 * GLX_ARB_create_context but not GLX 1.4. Making GLX 1.4 a hard
72 * requirement in this case does not seem like a limitation.
73 *
74 * This library currently only supports struct GLXClientInfo.
75 */
76
77 if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 0)
78 return;
79
80 /* Determine whether any screen on the server supports either of the
81 * create-context extensions.
82 */
83 for (i = 0; i < ScreenCount(glx_dpy->dpy); i++) {
84 struct glx_screen *src = glx_dpy->screens[i];
85
86 const char *haystack = src->serverGLXexts;
87 while (haystack != NULL) {
88 char *match = strstr(haystack, "GLX_ARB_create_context");
89
90 if (match == NULL)
91 break;
92
93 match += ext_length;
94
95 switch (match[0]) {
96 case '\0':
97 case ' ':
98 any_screen_has_ARB_create_context = True;
99 break;
100
101 case '_':
102 if (strncmp(match, "_profile", prof_length) == 0
103 && (match[prof_length] == '\0'
104 || match[prof_length] == ' ')) {
105 any_screen_has_ARB_create_context_profile = True;
106 match += prof_length;
107 }
108 break;
109 }
110
111 haystack = match;
112 }
113 }
114
115 gl_extension_string = __glXGetClientGLExtensionString();
116 if (gl_extension_string == NULL) {
117 return;
118 }
119
120 gl_extension_length = strlen(gl_extension_string) + 1;
121
122 c = XGetXCBConnection(glx_dpy->dpy);
123
124 /* Depending on the GLX verion and the available extensions on the server,
125 * send the correct "flavor" of protocol to the server.
126 *
127 * THE ORDER IS IMPORTANT. We want to send the most recent version of the
128 * protocol that the server can support.
129 */
130 if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
131 && any_screen_has_ARB_create_context_profile) {
132 xcb_glx_set_client_info_2arb(c,
133 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
134 sizeof(gl_versions_profiles)
135 / (3 * sizeof(gl_versions_profiles[0])),
136 gl_extension_length,
137 strlen(glx_extensions) + 1,
138 gl_versions_profiles,
139 gl_extension_string,
140 glx_extensions);
141 } else if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
142 && any_screen_has_ARB_create_context) {
143 xcb_glx_set_client_info_arb(c,
144 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
145 sizeof(gl_versions)
146 / (2 * sizeof(gl_versions[0])),
147 gl_extension_length,
148 strlen(glx_extensions) + 1,
149 gl_versions,
150 gl_extension_string,
151 glx_extensions);
152 } else {
153 xcb_glx_client_info(c,
154 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
155 gl_extension_length,
156 gl_extension_string);
157 }
158
159 free(gl_extension_string);
160 }
161