Added 21-deferred example.

examples/21-deferred/fs_deferred_debug.sc

@@ -0,0 +1,15 @@
+$input v_texcoord0
+
+/*
+ * Copyright 2011-2014 Branimir Karadzic. All rights reserved.
+ * License: http://www.opensource.org/licenses/BSD-2-Clause
+ */
+
+#include "../common/common.sh"
+
+SAMPLER2D(s_texColor, 0);
+
+void main()
+{
+	gl_FragColor = texture2D(s_texColor, v_texcoord0);
+}