glx: Add __glX_send_client_info super function

This function picks the correct client-info protocol (based on the
server's GLX version and set of extensions) and sends it to the
server.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>

src/glx/Makefile

@@ -10,6 +10,7 @@ EXTRA_DEFINES = $(EXTRA_DEFINES_XF86VIDMODE) -D_REENTRANT \
 
 SOURCES = \
 	  clientattrib.c \
+	  clientinfo.c \
 	  compsize.c \
 	  eval.c \
 	  glxconfig.c \

src/glx/clientinfo.c

@@ -0,0 +1,156 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <string.h>
+#include <ctype.h>
+
+#include "glxclient.h"
+#include <xcb/glx.h>
+#include <X11/Xlib-xcb.h>
+
+_X_HIDDEN void
+__glX_send_client_info(struct glx_display *glx_dpy)
+{
+   const unsigned ext_length = strlen("GLX_ARB_create_context");
+   const unsigned prof_length = strlen("_profile");
+   char *gl_extension_string;
+   int gl_extension_length;
+   xcb_connection_t *c;
+   Bool any_screen_has_ARB_create_context = False;
+   Bool any_screen_has_ARB_create_context_profile = False;
+   unsigned i;
+   static const uint32_t gl_versions[] = {
+      1, 4,
+   };
+   static const uint32_t gl_versions_profiles[] = {
+      1, 4, 0x00000000,
+   };
+   static const char glx_extensions[] =
+      "GLX_ARB_create_context GLX_ARB_create_context_profile";
+
+   /* There are three possible flavors of the client info structure that the
+    * client could send to the server.  The version sent depends on the
+    * combination of GLX versions and extensions supported by the client and
+    * the server.
+    *
+    * Server supports                  Client sends
+    * ----------------------------------------------------------------------
+    * GLX version = 1.0                Nothing.
+    *
+    * GLX version >= 1.1               struct GLXClientInfo
+    *
+    * GLX version >= 1.4 and
+    * GLX_ARB_create_context           struct glXSetClientInfoARB
+    *
+    * GLX version >= 1.4 and
+    * GLX_ARB_create_context_profile   struct glXSetClientInfo2ARB
+    *
+    * GLX_ARB_create_context and GLX_ARB_create_context_profile use FBConfigs,
+    * and these only exist in GLX 1.4 or with GLX_SGIX_fbconfig.  I can't
+    * imagine an implementation that supports GLX_SGIX_fbconfig and
+    * GLX_ARB_create_context but not GLX 1.4.  Making GLX 1.4 a hard
+    * requirement in this case does not seem like a limitation.
+    *
+    * This library currently only supports struct GLXClientInfo.
+    */
+
+   if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 0)
+      return;
+
+   /* Determine whether any screen on the server supports either of the
+    * create-context extensions.
+    */
+   for (i = 0; i < ScreenCount(glx_dpy->dpy); i++) {
+      struct glx_screen *src = glx_dpy->screens[i];
+
+      const char *haystack = src->serverGLXexts;
+      while (haystack != NULL) {
+	 char *match = strstr(haystack, "GLX_ARB_create_context");
+
+	 if (match == NULL)
+	    break;
+
+	 match += ext_length;
+
+	 switch (match[0]) {
+	 case '\0':
+	 case ' ':
+	    any_screen_has_ARB_create_context = True;
+	    break;
+
+	 case '_':
+	    if (strncmp(match, "_profile", prof_length) == 0
+		    && (match[prof_length] == '\0'
+			|| match[prof_length] == ' ')) {
+	       any_screen_has_ARB_create_context_profile = True;
+	       match += prof_length;
+	    }
+	    break;
+	 }
+
+	 haystack = match;
+      }
+   }
+
+   gl_extension_string = __glXGetClientGLExtensionString();
+   gl_extension_length = strlen(gl_extension_string) + 1;
+
+   c = XGetXCBConnection(glx_dpy->dpy);
+
+   /* Depending on the GLX verion and the available extensions on the server,
+    * send the correct "flavor" of protocol to the server.
+    *
+    * THE ORDER IS IMPORTANT.  We want to send the most recent version of the
+    * protocol that the server can support.
+    */
+   if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
+       && any_screen_has_ARB_create_context_profile) {
+      xcb_glx_set_client_info_2arb(c,
+				  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
+				   sizeof(gl_versions_profiles)
+				   / (3 * sizeof(gl_versions_profiles[0])),
+				  gl_extension_length,
+				  strlen(glx_extensions) + 1,
+				  gl_versions_profiles,
+				  gl_extension_string,
+				  glx_extensions);
+   } else if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
+	      && any_screen_has_ARB_create_context) {
+      xcb_glx_set_client_info_arb(c,
+				  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
+				  sizeof(gl_versions)
+				  / (2 * sizeof(gl_versions[0])),
+				  gl_extension_length,
+				  strlen(glx_extensions) + 1,
+				  gl_versions,
+				  gl_extension_string,
+				  glx_extensions);
+   } else {
+      xcb_glx_client_info(c,
+			  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
+			  gl_extension_length,
+			  gl_extension_string);
+   }
+
+   Xfree(gl_extension_string);
+}

src/glx/glxclient.h

@@ -726,6 +726,9 @@ extern void __glXFreeVertexArrayState(struct glx_context *);
 */
 extern void __glXClientInfo(Display * dpy, int opcode);
 
+_X_HIDDEN void
+__glX_send_client_info(struct glx_display *glx_dpy);
+
 /************************************************************************/
 
 /*