glx: conditionaly build dri3 and present loader (v3)

This patch makes it possible to disable DRI3 if desired.

Tested with:

./configure --disable-dri3 --with-dri-drivers=i965 \
--with-gallium-drivers= --disable-vdpau --disable-egl \
--disable-gbm --disable-xvmc

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71397
Cc: 10.0 <mesa-stable@lists.freedesktop.org>

configure.ac

@@ -536,6 +536,11 @@ AC_ARG_ENABLE([dri],
         [enable DRI modules @<:@default=enabled@:>@])],
     [enable_dri="$enableval"],
     [enable_dri=yes])
+AC_ARG_ENABLE([dri3],
+    [AS_HELP_STRING([--enable-dri3],
+        [enable DRI3 @<:@default=enabled@:>@])],
+    [enable_dri3="$enableval"],
+    [enable_dri3=yes])
 AC_ARG_ENABLE([glx],
     [AS_HELP_STRING([--enable-glx],
         [enable GLX library @<:@default=enabled@:>@])],
@@ -702,6 +707,7 @@ fi
 AM_CONDITIONAL(HAVE_DRI_GLX, test "x$enable_glx" = xyes -a \
                                   "x$enable_dri" = xyes)
 AM_CONDITIONAL(HAVE_DRI, test "x$enable_dri" = xyes)
+AM_CONDITIONAL(HAVE_DRI3, test "x$enable_dri3" = xyes)
 
 AC_ARG_ENABLE([shared-glapi],
     [AS_HELP_STRING([--enable-shared-glapi],
@@ -756,6 +762,9 @@ AC_SUBST([MESA_LLVM])
 PKG_CHECK_MODULES([LIBDRM], [libdrm >= $LIBDRM_REQUIRED],
                   [have_libdrm=yes], [have_libdrm=no])
 
+PKG_CHECK_MODULES([LIBUDEV], [libudev >= $LIBUDEV_REQUIRED],
+                  have_libudev=yes, have_libudev=no)
+
 if test "x$enable_dri" = xyes; then
     # DRI must be shared, I think
     if test "$enable_static" = yes; then
@@ -811,13 +820,21 @@ xyesno)
         fi
         PKG_CHECK_MODULES([DRI2PROTO], [dri2proto >= $DRI2PROTO_REQUIRED])
         GL_PC_REQ_PRIV="$GL_PC_REQ_PRIV libdrm >= $LIBDRM_REQUIRED"
-        PKG_CHECK_MODULES([DRI3PROTO], [dri3proto >= $DRI3PROTO_REQUIRED])
+        if test x"$enable_dri3" = xyes; then
-        PKG_CHECK_MODULES([PRESENTPROTO], [presentproto >= $PRESENTPROTO_REQUIRED])
+            if test x"$have_libudev" != xyes; then
-        PKG_CHECK_MODULES([LIBUDEV], [libudev >= $LIBUDEV_REQUIRED])
+              AC_MSG_ERROR([DRI3 requires libudev >= $LIBUDEV_REQUIRED])
+            fi
+            PKG_CHECK_MODULES([DRI3PROTO], [dri3proto >= $DRI3PROTO_REQUIRED])
+            PKG_CHECK_MODULES([PRESENTPROTO], [presentproto >= $PRESENTPROTO_REQUIRED])
+        fi
     fi
 
     # find the DRI deps for libGL
-    dri_modules="x11 xext xdamage xfixes x11-xcb xcb-glx >= 1.8.1 xcb-dri2 >= 1.8 xcb-dri3 xcb-present xcb-sync xshmfence"
+    dri_modules="x11 xext xdamage xfixes x11-xcb xcb-glx >= 1.8.1 xcb-dri2 >= 1.8"
+
+    if test x"$enable_dri3" = xyes; then
+        dri_modules="$dri_modules xcb-dri3 xcb-present xcb-sync xshmfence"
+    fi
 
     # add xf86vidmode if available
     PKG_CHECK_MODULES([XF86VIDMODE], [xxf86vm], HAVE_XF86VIDMODE=yes, HAVE_XF86VIDMODE=no)
@@ -827,8 +844,13 @@ xyesno)
 
     PKG_CHECK_MODULES([DRIGL], [$dri_modules])
     GL_PC_REQ_PRIV="$GL_PC_REQ_PRIV $dri_modules"
-    X11_INCLUDES="$X11_INCLUDES $DRIGL_CFLAGS $LIBUDEV_CFLAGS"
+    X11_INCLUDES="$X11_INCLUDES $DRIGL_CFLAGS"
-    GL_LIB_DEPS="$DRIGL_LIBS $LIBUDEV_LIBS"
+    GL_LIB_DEPS="$DRIGL_LIBS"
+
+    if test x"$enable_dri3$have_libudev" = xyesyes; then
+        X11_INCLUDES="$X11_INCLUDES $LIBUDEV_CFLAGS"
+        GL_LIB_DEPS="$GL_LIB_DEPS $LIBUDEV_LIBS"
+    fi
 
     # need DRM libs, $PTHREAD_LIBS, etc.
     GL_LIB_DEPS="$GL_LIB_DEPS $LIBDRM_LIBS -lm $PTHREAD_LIBS $DLOPEN_LIBS"
@@ -947,6 +969,9 @@ if test "x$enable_dri" = xyes; then
     linux*)
         DEFINES="$DEFINES -DUSE_EXTERNAL_DXTN_LIB=1"
         DEFINES="$DEFINES -DHAVE_ALIAS"
+        if test "x$enable_dri3" = xyes; then
+            DEFINES="$DEFINES -DHAVE_DRI3"
+        fi
 
         case "$host_cpu" in
         x86_64|amd64)
@@ -1142,8 +1167,9 @@ if test "x$enable_gbm" = xauto; then
     esac
 fi
 if test "x$enable_gbm" = xyes; then
-    PKG_CHECK_MODULES([LIBUDEV], [libudev], [],
+    if test x"$have_libudev" != xyes; then
-                      AC_MSG_ERROR([gbm needs udev]))
+        AC_MSG_ERROR([gbm needs udev])
+    fi
 
     if test "x$enable_dri" = xyes; then
         GBM_BACKEND_DIRS="$GBM_BACKEND_DIRS dri"
@@ -1170,8 +1196,6 @@ if test "x$enable_egl" = xyes; then
 
     if test "$enable_static" != yes; then
         # build egl_glx when libGL is built
-        PKG_CHECK_MODULES([LIBUDEV], [libudev > 150],
-                          [have_libudev=yes],[have_libudev=no])
         if test "$have_libudev" = yes; then
             DEFINES="$DEFINES -DHAVE_LIBUDEV"
         fi

src/glx/Makefile.am

@@ -94,10 +94,14 @@ libglx_la_SOURCES = \
 	  dri2_glx.c \
 	  dri2.c \
 	  dri2_query_renderer.c \
-          dri3_glx.c \
-          dri3_common.c \
 	  applegl_glx.c
 
+if HAVE_DRI3
+libglx_la_SOURCES += \
+          dri3_glx.c \
+          dri3_common.c
+endif
+
 GL_LIBS = \
 	libglx.la \
 	$(SHARED_GLAPI_LIBS) \

src/glx/glxext.c

@@ -770,8 +770,10 @@ AllocAndFetchScreenConfigs(Display * dpy, struct glx_display * priv)
    for (i = 0; i < screens; i++, psc++) {
       psc = NULL;
 #if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
+#if defined(HAVE_DRI3)
       if (priv->dri3Display)
          psc = (*priv->dri3Display->createScreen) (i, priv);
+#endif
       if (psc == NULL && priv->dri2Display)
 	 psc = (*priv->dri2Display->createScreen) (i, priv);
       if (psc == NULL && priv->driDisplay)
@@ -865,8 +867,10 @@ __glXInitialize(Display * dpy)
     ** (e.g., those called in AllocAndFetchScreenConfigs).
     */
    if (glx_direct && glx_accel) {
+#if defined(HAVE_DRI3)
       if (!getenv("LIBGL_DRI3_DISABLE"))
          dpyPriv->dri3Display = dri3_create_display(dpy);
+#endif
       dpyPriv->dri2Display = dri2CreateDisplay(dpy);
       dpyPriv->driDisplay = driCreateDisplay(dpy);
    }