Add CMYKHalftone, LumaSobel, DropShadow and segmented waves

orx-fx/src/main/kotlin/edges/LumaSobel.kt

@@ -0,0 +1,32 @@
+package org.openrndr.extra.fx.edges
+
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.Filter
+import org.openrndr.draw.Shader
+import org.openrndr.extra.fx.filterFragmentCode
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+@Description("Luma threshold ")
+class LumaSobel : Filter(Shader.createFromCode(Filter.filterVertexCode, filterFragmentCode("edges/luma-sobel.frag"))) {
+
+    @ColorParameter("background color")
+    var backgroundColor: ColorRGBa by parameters
+
+    @ColorParameter("edge color")
+    var edgeColor: ColorRGBa by parameters
+
+    @DoubleParameter("background opacity", 0.0, 1.0)
+    var backgroundOpacity:Double by parameters
+
+    @DoubleParameter("edge opacity", 0.0, 1.0)
+    var edgeOpacity:Double by parameters
+
+    init {
+        backgroundColor = ColorRGBa.BLACK
+        edgeColor = ColorRGBa.WHITE
+        edgeOpacity = 1.0
+        backgroundOpacity = 1.0
+    }
+}