src/glx/clientinfo.c

   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    free(gl_extension_string);
 156 }