mesa: Require current libxcb.

Without that, people with buggy apps that looked at just the server
string for GLX_ARB_create_context would call this function that just
threw an error when you tried to make a context.  Google shows plenty
of complaints about this.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

configure.ac

@@ -1030,29 +1030,12 @@ xyesno)
         GL_PC_CFLAGS="$X11_INCLUDES"
 
         # XCB can only be used from pkg-config
-        PKG_CHECK_MODULES([XCB],[x11-xcb xcb-glx])
+        PKG_CHECK_MODULES([XCB],[x11-xcb xcb-glx >= 1.8.1])
         GL_PC_REQ_PRIV="$GL_PC_REQ_PRIV x11-xcb xcb-glx"
         X11_INCLUDES="$X11_INCLUDES $XCB_CFLAGS"
         GL_LIB_DEPS="$GL_LIB_DEPS $XCB_LIBS"
     fi
 
-    # Check to see if the xcb-glx library is new enough to support
-    # GLX_ARB_create_context.  This bit of hackery is necessary until XCB 1.8
-    # is released.
-    save_CPPFLAGS="$CPPFLAGS"
-    save_LDFLAGS="$LDFLAGS"
-    CPPFLAGS="$CPPFLAGS $X11_INCLUDES"
-    LDFLAGS="$LDFLAGS $GL_LIB_DEPS"
-    AC_CHECK_LIB(xcb-glx, xcb_glx_create_context_attribs_arb_checked,
-        [HAVE_XCB_GLX_CREATE_CONTEXT=yes],
-        [HAVE_XCB_GLX_CREATE_CONTEXT=no])
-    CPPFLAGS="$save_CPPFLAGS"
-    LDFLAGS="$save_LDFLAGS"
-
-    if test x$HAVE_XCB_GLX_CREATE_CONTEXT = xyes; then
-        X11_INCLUDES="$X11_INCLUDES -DHAVE_XCB_GLX_CREATE_CONTEXT"
-    fi
-
     # need DRM libs, -lpthread, etc.
     GL_LIB_DEPS="$GL_LIB_DEPS $LIBDRM_LIBS -lm -lpthread $DLOPEN_LIBS"
     GL_PC_LIB_PRIV="-lm -lpthread $DLOPEN_LIBS"
@@ -1061,8 +1044,6 @@ esac
 
 # This is outside the case (above) so that it is invoked even for non-GLX
 # builds.
-AM_CONDITIONAL(HAVE_XCB_GLX_CREATE_CONTEXT,
-    test x$HAVE_XCB_GLX_CREATE_CONTEXT = xyes)
 AM_CONDITIONAL(HAVE_XF86VIDMODE, test "x$HAVE_XF86VIDMODE" = xyes)
 
 GLESv1_CM_LIB_DEPS="$LIBDRM_LIBS -lm -lpthread $DLOPEN_LIBS"

src/glx/clientinfo.c

@@ -39,7 +39,6 @@ __glX_send_client_info(struct glx_display *glx_dpy)
    Bool any_screen_has_ARB_create_context = False;
    Bool any_screen_has_ARB_create_context_profile = False;
    unsigned i;
-#ifdef HAVE_XCB_GLX_CREATE_CONTEXT
    static const uint32_t gl_versions[] = {
       1, 4,
    };
@@ -48,7 +47,6 @@ __glX_send_client_info(struct glx_display *glx_dpy)
    };
    static const char glx_extensions[] =
       "GLX_ARB_create_context GLX_ARB_create_context_profile";
-#endif
 
    /* There are three possible flavors of the client info structure that the
     * client could send to the server.  The version sent depends on the
@@ -125,7 +123,6 @@ __glX_send_client_info(struct glx_display *glx_dpy)
     * THE ORDER IS IMPORTANT.  We want to send the most recent version of the
     * protocol that the server can support.
     */
-#ifdef HAVE_XCB_GLX_CREATE_CONTEXT
    if (glx_dpy->majorVersion == 1 && glx_dpy->minorVersion == 4
        && any_screen_has_ARB_create_context_profile) {
       xcb_glx_set_client_info_2arb(c,
@@ -148,9 +145,7 @@ __glX_send_client_info(struct glx_display *glx_dpy)
 				  gl_versions,
 				  gl_extension_string,
 				  glx_extensions);
-   } else
-#endif
-   {
+   } else {
       xcb_glx_client_info(c,
 			  GLX_MAJOR_VERSION, GLX_MINOR_VERSION,
 			  gl_extension_length,

src/glx/create_context.c

@@ -99,7 +99,6 @@ glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config,
     * the protocol error and handle it.  Part of handling the error is freeing
     * the possibly non-NULL value returned by this function.
     */
-#ifdef HAVE_XCB_GLX_CREATE_CONTEXT
    cookie =
       xcb_glx_create_context_attribs_arb_checked(c,
 						 gc->xid,
@@ -111,19 +110,6 @@ glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config,
 						 (const uint32_t *)
 						 attrib_list);
    err = xcb_request_check(c, cookie);
-#else
-   /* This is a hugely ugly hack to make things compile on systems that lack
-    * the proper XCB version.
-    */
-   memset(&cookie, 0, sizeof(cookie));
-
-   err = calloc(1, sizeof(*err));
-   err->error_code = BadRequest;
-   err->sequence = dpy->request;
-   err->resource_id = gc->xid;
-   err->minor_code = gc->majorOpcode;
-   err->major_code = 34;
-#endif
    if (err != NULL) {
       gc->vtable->destroy(gc);
       gc = NULL;

src/glx/glxextensions.c

@@ -71,15 +71,9 @@ struct extension_info
 
 /* *INDENT-OFF* */
 static const struct extension_info known_glx_extensions[] = {
-#ifdef HAVE_XCB_GLX_CREATE_CONTEXT
    { GLX(ARB_create_context),          VER(0,0), Y, N, N, N },
    { GLX(ARB_create_context_profile),  VER(0,0), Y, N, N, N },
    { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N },
-#else
-   { GLX(ARB_create_context),          VER(0,0), N, N, N, N },
-   { GLX(ARB_create_context_profile),  VER(0,0), N, N, N, N },
-   { GLX(ARB_create_context_robustness), VER(0,0), N, N, N, N },
-#endif
    { GLX(ARB_get_proc_address),        VER(1,4), Y, N, Y, N },
    { GLX(ARB_multisample),             VER(1,4), Y, Y, N, N },
    { GLX(ATI_pixel_format_float),      VER(0,0), N, N, N, N },
@@ -87,11 +81,7 @@ static const struct extension_info known_glx_extensions[] = {
    { GLX(EXT_visual_info),             VER(0,0), Y, Y, N, N },
    { GLX(EXT_visual_rating),           VER(0,0), Y, Y, N, N },
    { GLX(EXT_framebuffer_sRGB),        VER(0,0), Y, Y, N, N },
-#ifdef HAVE_XCB_GLX_CREATE_CONTEXT
    { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y },
-#else
-   { GLX(EXT_create_context_es2_profile), VER(0,0), N, N, N, N },
-#endif
    { GLX(MESA_copy_sub_buffer),        VER(0,0), Y, N, N, N },
    { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
    { GLX(MESA_swap_control),           VER(0,0), Y, N, N, Y },

src/glx/tests/Makefile.am

@@ -5,7 +5,6 @@ AM_CPPFLAGS = \
 	-I$(top_builddir)/include \
 	$(X11_CFLAGS)
 
-if HAVE_XCB_GLX_CREATE_CONTEXT
 TESTS = glx-test
 check_PROGRAMS = glx-test
 
@@ -20,5 +19,3 @@ glx_test_LDADD = \
 	$(top_builddir)/src/glx/libglx.la \
 	$(top_builddir)/src/gtest/libgtest.la \
 	-lpthread
-
-endif