From ba81a3a14c6f6d58d08632c4a10c3f21fd3d1b73 Mon Sep 17 00:00:00 2001
From: Rob Bradford <rob@linux.intel.com>
Date: Mon, 16 Apr 2012 15:29:44 +0100
Subject: [PATCH] build: Add an enable flag to allow enabling Cairo GL backend

This change adds --enable-wayland-cairo-gl which turns on the define used in
the Wayland backend to determine whether to use EGL surfaces with Cairo GL or
whether to use the Cairo image backend with an SHM surface (the default).

Part of the fix for: https://bugzilla.gnome.org/show_bug.cgi?id=672361
---
 configure.ac | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8e1d691ef..3cbfa036d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -316,6 +316,12 @@ AC_ARG_ENABLE(quartz-relocation,
                               [enable bundle-based relocation functions])],
                               [quartz_relocation=yes])
 
+AC_ARG_ENABLE(wayland-cairo-gl,
+              AS_HELP_STRING([--enable-wayland-cairo-gl],
+                             [enable the use of Cairo GL in the Wayland backend]),
+              [enable_wayland_cairo_gl=yes])
+
+
 cairo_backends=
 backend_immodules=
 have_gio_unix=no
@@ -379,8 +385,14 @@ else
 fi
 
 if test "x$enable_wayland_backend" == "xyes"; then
-  # For the cairo image backend
-  cairo_backends="$cairo_backends cairo"
+  if test "x$enable_wayland_cairo_gl" == "xyes"; then
+    # Wayland can use cairo-gl
+    cairo_backends="$cairo_backends cairo-gl"
+    AC_DEFINE(GDK_WAYLAND_USE_EGL, [1], [Whether to use EGL in Wayland backend])
+  else
+    # For the cairo image backend
+    cairo_backends="$cairo_backends cairo"
+  fi
   GDK_BACKENDS="$GDK_BACKENDS wayland"
   have_gio_unix=yes
   GDK_WINDOWING="$GDK_WINDOWING
-- 
2.43.2