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
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   gl_extension_length = strlen(gl_extension_string) + 1;
117
118   c = XGetXCBConnection(glx_dpy->dpy);
119
120   /* Depending on the GLX verion and the available extensions on the server,
121    * send the correct "flavor" of protocol to the server.
122    *
123    * THE ORDER IS IMPORTANT.  We want to send the most recent version of the
124    * protocol that the server can support.
125    */
126   if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
127       && any_screen_has_ARB_create_context_profile) {
128      xcb_glx_set_client_info_2arb(c,
129				  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
130				   sizeof(gl_versions_profiles)
131				   / (3 * sizeof(gl_versions_profiles[0])),
132				  gl_extension_length,
133				  strlen(glx_extensions) + 1,
134				  gl_versions_profiles,
135				  gl_extension_string,
136				  glx_extensions);
137   } else if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
138	      && any_screen_has_ARB_create_context) {
139      xcb_glx_set_client_info_arb(c,
140				  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
141				  sizeof(gl_versions)
142				  / (2 * sizeof(gl_versions[0])),
143				  gl_extension_length,
144				  strlen(glx_extensions) + 1,
145				  gl_versions,
146				  gl_extension_string,
147				  glx_extensions);
148   } else {
149      xcb_glx_client_info(c,
150			  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
151			  gl_extension_length,
152			  gl_extension_string);
153   }
154
155   Xfree(gl_extension_string);
156}
157