clients: Allow compiling with the cairo glesv2 backend

This disables gears and wscreensaver, which use full GL.

clients/Makefile.am

@@ -18,7 +18,6 @@ endif
 
 if BUILD_CLIENTS
 clients_programs =				\
-	gears					\
 	flower					\
 	screenshot				\
 	terminal				\
@@ -26,8 +25,8 @@ clients_programs =				\
 	dnd					\
 	smoke					\
 	resizor					\
-	wscreensaver				\
-	eventdemo
+	eventdemo				\
+	$(full_gl_client_programs)
 
 desktop_shell = weston-desktop-shell
 tablet_shell = weston-tablet-shell
@@ -37,7 +36,7 @@ noinst_LIBRARIES = libtoytoolkit.a
 AM_CFLAGS = $(GCC_CFLAGS)
 AM_CPPFLAGS =					\
 	-DDATADIR='"$(datadir)"'		\
-	$(CLIENT_CFLAGS)
+	$(CLIENT_CFLAGS) $(CAIRO_EGL_CFLAGS)
 
 libtoytoolkit_a_SOURCES =			\
 	window.c				\
@@ -47,10 +46,7 @@ libtoytoolkit_a_SOURCES =			\
 
 toolkit_libs =					\
 	libtoytoolkit.a				\
-	$(CLIENT_LIBS) -lrt -lm
-
-gears_SOURCES = gears.c
-gears_LDADD = $(toolkit_libs)
+	$(CLIENT_LIBS) $(CAIRO_EGL_LIBS) -lrt -lm
 
 flower_SOURCES = flower.c
 flower_LDADD = $(toolkit_libs)
@@ -73,17 +69,6 @@ smoke_LDADD = $(toolkit_libs)
 resizor_SOURCES = resizor.c
 resizor_LDADD = $(toolkit_libs)
 
-wscreensaver_SOURCES =				\
-	wscreensaver.c				\
-	wscreensaver.h				\
-	desktop-shell-client-protocol.h		\
-	desktop-shell-protocol.c		\
-	wscreensaver-glue.c			\
-	wscreensaver-glue.h			\
-	glmatrix.c				\
-	matrix3.xpm
-wscreensaver_LDADD = $(toolkit_libs) -lGLU
-
 eventdemo_SOURCES = eventdemo.c
 eventdemo_LDADD = $(toolkit_libs)
 
@@ -112,6 +97,26 @@ BUILT_SOURCES =					\
 CLEANFILES = $(BUILT_SOURCES)
 endif
 
+if BUILD_FULL_GL_CLIENTS
+full_gl_client_programs =			\
+	gears					\
+	wscreensaver
+
+gears_SOURCES = gears.c
+gears_LDADD = $(toolkit_libs)
+
+wscreensaver_SOURCES =				\
+	wscreensaver.c				\
+	wscreensaver.h				\
+	desktop-shell-client-protocol.h		\
+	desktop-shell-protocol.c		\
+	wscreensaver-glue.c			\
+	wscreensaver-glue.h			\
+	glmatrix.c				\
+	matrix3.xpm
+wscreensaver_LDADD = $(toolkit_libs) -lGLU
+endif
+
 @wayland_scanner_rules@
 
 if HAVE_POPPLER

clients/window.c

@@ -2743,13 +2743,24 @@ init_egl(struct display *d)
 		EGL_NONE
 	};
 
+#ifdef USE_CAIRO_GLESV2
+	static const EGLint context_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+	EGLint api = EGL_OPENGL_ES_API;
+#else
+	EGLint *context_attribs = NULL;
+	EGLint api = EGL_OPENGL_API;
+#endif
+
 	d->dpy = eglGetDisplay(d->display);
 	if (!eglInitialize(d->dpy, &major, &minor)) {
 		fprintf(stderr, "failed to initialize display\n");
 		return -1;
 	}
 
-	if (!eglBindAPI(EGL_OPENGL_API)) {
+	if (!eglBindAPI(api)) {
 		fprintf(stderr, "failed to bind api EGL_OPENGL_API\n");
 		return -1;
 	}
@@ -2766,13 +2777,14 @@ init_egl(struct display *d)
 		return -1;
 	}
 
-	d->rgb_ctx = eglCreateContext(d->dpy, d->rgb_config, EGL_NO_CONTEXT, NULL);
+	d->rgb_ctx = eglCreateContext(d->dpy, d->rgb_config,
+				      EGL_NO_CONTEXT, context_attribs);
 	if (d->rgb_ctx == NULL) {
 		fprintf(stderr, "failed to create context\n");
 		return -1;
 	}
 	d->argb_ctx = eglCreateContext(d->dpy, d->argb_config,
-				       EGL_NO_CONTEXT, NULL);
+				       EGL_NO_CONTEXT, context_attribs);
 	if (d->argb_ctx == NULL) {
 		fprintf(stderr, "failed to create context\n");
 		return -1;

configure.ac

@@ -91,6 +91,16 @@ if test x$enable_wayland_compositor == xyes; then
   PKG_CHECK_MODULES(WAYLAND_COMPOSITOR, [wayland-client wayland-egl])
 fi
 
+AC_ARG_WITH(cairo-glesv2, AS_HELP_STRING([--with-cairo-gles2],
+              [Use GLESv2 cairo instead of full GL]),
+              [cairo_modules="cairo-glesv2"],
+              [cairo_modules="cairo-gl"])
+AM_CONDITIONAL(BUILD_FULL_GL_CLIENTS,
+	       test x$cairo_modules == "xcairo-gl")
+if test x$cairo_modules == xcairo-glesv2; then
+  AC_DEFINE([USE_CAIRO_GLESV2], [1], [Use the GLESv2 GL cairo backend])
+fi
+
 AC_ARG_ENABLE(simple-clients, [  --enable-simple-clients],, enable_simple_clients=yes)
 AM_CONDITIONAL(BUILD_SIMPLE_CLIENTS, test x$enable_simple_clients == xyes)
 if test x$enable_simple_clients == xyes; then
@@ -104,12 +114,13 @@ AM_CONDITIONAL(BUILD_CLIENTS, test x$enable_clients == xyes)
 if test x$enable_clients == xyes; then
   AC_DEFINE([BUILD_CLIENTS], [1], [Build the Wayland clients])
 
-  PKG_CHECK_MODULES(CLIENT, [wayland-client wayland-egl egl >= 7.10 gl cairo >= 1.10.0 gdk-pixbuf-2.0 glib-2.0 gobject-2.0 gio-2.0 xkbcommon])
+  PKG_CHECK_MODULES(CLIENT, [wayland-client wayland-egl egl >= 7.10 cairo >= 1.10.0 gdk-pixbuf-2.0 glib-2.0 gobject-2.0 gio-2.0 xkbcommon])
 
   PKG_CHECK_MODULES(POPPLER, [poppler-glib],
 			     [have_poppler=yes], [have_poppler=no])
-  PKG_CHECK_MODULES(CAIRO_EGL, [cairo-egl >= 1.11.3],
+  PKG_CHECK_MODULES(CAIRO_EGL, [cairo-egl >= 1.11.3 $cairo_modules],
 		    [have_cairo_egl=yes], [have_cairo_egl=no])
+
   AS_IF([test "x$have_cairo_egl" = "xyes"],
         [AC_DEFINE([HAVE_CAIRO_EGL], [1], [Have cairo-egl])],
         [AC_MSG_WARN([Cairo-EGL not found - clients will use cairo image])])