Make EGL/GLESv2 dependencies optional

Introduce --disable-egl switch for configure to disable
EGL/GLESv2 support.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

src/Makefile.am

@@ -34,7 +34,6 @@ weston_SOURCES =				\
 	workspaces-server-protocol.h		\
 	util.c					\
 	gl-renderer.h				\
-	gl-renderer.c				\
 	noop-renderer.c				\
 	pixman-renderer.c			\
 	pixman-renderer.h			\
@@ -43,6 +42,11 @@ weston_SOURCES =				\
 	weston-launch.h				\
 	weston-egl-ext.h
 
+if ENABLE_EGL
+weston_SOURCES +=				\
+	gl-renderer.c
+endif
+
 git-version.h : .FORCE
 	$(AM_V_GEN)(echo "#define BUILD_ID \"$(shell git --work-tree=$(top_srcdir) describe --always --dirty) $(shell git --work-tree=$(top_srcdir) log -1 --format='%s (%ci)')\"" > $@-new; \
 	cmp -s $@ $@-new || cp $@-new $@; \

src/compositor-x11.c

@@ -884,7 +884,7 @@ x11_compositor_create_output(struct x11_compositor *c, int x, int y,
 			return NULL;
 		}
 	} else {
-		if (gl_renderer_output_create(&output->base, output->window) < 0)
+		if (gl_renderer_output_create(&output->base, (EGLNativeWindowType)output->window) < 0)
 			return NULL;
 	}
 
@@ -1474,7 +1474,7 @@ x11_compositor_create(struct wl_display *display,
 			goto err_xdisplay;
 	}
 	else {
-		if (gl_renderer_create(&c->base, c->dpy, gl_renderer_opaque_attribs,
+		if (gl_renderer_create(&c->base, (EGLNativeDisplayType)c->dpy, gl_renderer_opaque_attribs,
 				NULL) < 0)
 			goto err_xdisplay;
 	}

src/gl-renderer.h

@@ -20,8 +20,13 @@
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
 #include  "compositor.h"
 
+#ifdef ENABLE_EGL
+
 #include <EGL/egl.h>
 
 extern const EGLint gl_renderer_opaque_attribs[];
@@ -45,3 +50,57 @@ gl_renderer_set_border(struct weston_compositor *ec, int32_t width, int32_t heig
 
 void
 gl_renderer_print_egl_error_state(void);
+#else
+
+typedef int EGLint;
+typedef int EGLDisplay;
+typedef int EGLSurface;
+typedef long int EGLNativeDisplayType;
+typedef long int EGLNativeWindowType;
+
+static const EGLint gl_renderer_opaque_attribs[];
+static const EGLint gl_renderer_alpha_attribs[];
+
+inline static int
+gl_renderer_create(struct weston_compositor *ec, EGLNativeDisplayType display,
+	const EGLint *attribs, const EGLint *visual_id)
+{
+	return -1;
+}
+
+inline static EGLDisplay
+gl_renderer_display(struct weston_compositor *ec)
+{
+	return 0;
+}
+
+inline static int
+gl_renderer_output_create(struct weston_output *output,
+				    EGLNativeWindowType window)
+{
+	return -1;
+}
+
+inline static void
+gl_renderer_output_destroy(struct weston_output *output)
+{
+}
+
+inline static EGLSurface
+gl_renderer_output_surface(struct weston_output *output)
+{
+	return 0;
+}
+
+inline static void
+gl_renderer_set_border(struct weston_compositor *ec, int32_t width, int32_t height, void *data,
+			  int32_t *edges)
+{
+}
+
+inline static void
+gl_renderer_print_egl_error_state(void)
+{
+}
+
+#endif