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 /* You need GLX_ARB_create_context_profile to get beyond 3.1 anyway */
43 static const uint32_t gl_versions[] = {
44 2, 1,
45 3, 0,
46 3, 1,
47 };
48 /*
49 * This is weird, but it matches what NVIDIA does/expects. For big-GL
50 * below 3.2 there is no such thing as a "profile", so we name them all
51 * with no profile bits. Except we don't name anything lower than 2.1,
52 * since GLX_ARB_create_context_profile says:
53 *
54 * "Only the highest supported version below 3.0 should be sent, since
55 * OpenGL 2.1 is backwards compatible with all earlier versions."
56 *
57 * In order to also support GLES below 3.2, we name every possible GLES
58 * version with the ES2 bit set, which happens to just mean GLES generally
59 * and not a particular major version. 3.2 happens to be a legal version
60 * number for both big-GL and GLES, so it gets all three bits set.
61 * Everything 3.3 and above is big-GL only so gets the core and compat
62 * bits set.
63 */
64 static const uint32_t gl_versions_profiles[] = {
65 1, 0, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
66 1, 1, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
67 2, 0, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
68 2, 1, 0x0,
69 3, 0, 0x0,
70 3, 0, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
71 3, 1, 0x0,
72 3, 1, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
73 3, 2, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
74 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB |
75 GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
76 3, 3, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
77 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
78 4, 0, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
79 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
80 4, 1, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
81 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
82 4, 2, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
83 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
84 4, 3, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
85 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
86 4, 4, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
87 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
88 4, 5, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
89 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
90 4, 6, GLX_CONTEXT_CORE_PROFILE_BIT_ARB |
91 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
92 };
93 static const char glx_extensions[] =
94 "GLX_ARB_create_context GLX_ARB_create_context_profile";
95
96 /* There are three possible flavors of the client info structure that the
97 * client could send to the server. The version sent depends on the
98 * combination of GLX versions and extensions supported by the client and
99 * the server. This client only supports GLX major version 1.
100 *
101 * Server supports Client sends
102 * ----------------------------------------------------------------------
103 * GLX version = 1.0 Nothing.
104 *
105 * GLX version >= 1.1 struct GLXClientInfo
106 *
107 * GLX version >= 1.4 and
108 * GLX_ARB_create_context struct glXSetClientInfoARB
109 *
110 * GLX version >= 1.4 and
111 * GLX_ARB_create_context_profile struct glXSetClientInfo2ARB
112 *
113 * GLX_ARB_create_context and GLX_ARB_create_context_profile use FBConfigs,
114 * and these only exist in GLX 1.4 or with GLX_SGIX_fbconfig. I can't
115 * imagine an implementation that supports GLX_SGIX_fbconfig and
116 * GLX_ARB_create_context but not GLX 1.4. Making GLX 1.4 a hard
117 * requirement in this case does not seem like a limitation.
118 */
119
120 if (glx_dpy->minorVersion == 0)
121 return;
122
123 /* Determine whether any screen on the server supports either of the
124 * create-context extensions.
125 */
126 for (i = 0; i < ScreenCount(glx_dpy->dpy); i++) {
127 struct glx_screen *src = glx_dpy->screens[i];
128
129 const char *haystack = src->serverGLXexts;
130 while (haystack != NULL) {
131 char *match = strstr(haystack, "GLX_ARB_create_context");
132
133 if (match == NULL)
134 break;
135
136 match += ext_length;
137
138 switch (match[0]) {
139 case '\0':
140 case ' ':
141 any_screen_has_ARB_create_context = True;
142 break;
143
144 case '_':
145 if (strncmp(match, "_profile", prof_length) == 0
146 && (match[prof_length] == '\0'
147 || match[prof_length] == ' ')) {
148 any_screen_has_ARB_create_context_profile = True;
149 match += prof_length;
150 }
151 break;
152 }
153
154 haystack = match;
155 }
156 }
157
158 gl_extension_string = __glXGetClientGLExtensionString();
159 if (gl_extension_string == NULL) {
160 return;
161 }
162
163 gl_extension_length = strlen(gl_extension_string) + 1;
164
165 c = XGetXCBConnection(glx_dpy->dpy);
166
167 /* Depending on the GLX verion and the available extensions on the server,
168 * send the correct "flavor" of protocol to the server.
169 *
170 * THE ORDER IS IMPORTANT. We want to send the most recent version of the
171 * protocol that the server can support.
172 */
173 if (glx_dpy->minorVersion == 4
174 && any_screen_has_ARB_create_context_profile) {
175 xcb_glx_set_client_info_2arb(c,
176 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
177 sizeof(gl_versions_profiles)
178 / (3 * sizeof(gl_versions_profiles[0])),
179 gl_extension_length,
180 strlen(glx_extensions) + 1,
181 gl_versions_profiles,
182 gl_extension_string,
183 glx_extensions);
184 } else if (glx_dpy->minorVersion == 4
185 && any_screen_has_ARB_create_context) {
186 xcb_glx_set_client_info_arb(c,
187 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
188 sizeof(gl_versions)
189 / (2 * sizeof(gl_versions[0])),
190 gl_extension_length,
191 strlen(glx_extensions) + 1,
192 gl_versions,
193 gl_extension_string,
194 glx_extensions);
195 } else {
196 xcb_glx_client_info(c,
197 GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
198 gl_extension_length,
199 gl_extension_string);
200 }
201
202 free(gl_extension_string);
203 }
204