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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