Add StretchWaves filter

orx-fx/src/main/kotlin/distort/StretchWaves.kt

@@ -0,0 +1,41 @@
+package org.openrndr.extra.fx.distort
+
+import org.openrndr.draw.*
+import org.openrndr.extra.fx.filterFragmentCode
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+@Description("Stretch waves")
+class StretchWaves : Filter(filterShaderFromCode(filterFragmentCode("distort/stretch-waves.frag"))) {
+    @DoubleParameter("distortion", -0.0,1.0, 1)
+    var distortion: Double by parameters
+
+    @DoubleParameter("rotation", -180.0, 180.0)
+    var rotation: Double by parameters
+
+    @DoubleParameter("phase", -1.0, 1.0)
+    var phase: Double by parameters
+
+    @DoubleParameter("frequency", 0.0, 100.0)
+    var frequency: Double by parameters
+
+    @DoubleParameter("feather", 0.0, 100.0, order = 1)
+    var feather: Double by parameters
+
+    init {
+        distortion = 0.0
+        rotation = 0.0
+        phase = 0.0
+        frequency = 10.0
+        feather = 1.0
+    }
+
+    var bicubicFiltering = true
+    override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
+        if (bicubicFiltering && source.isNotEmpty()) {
+            source[0].generateMipmaps()
+            source[0].filter(MinifyingFilter.LINEAR_MIPMAP_LINEAR, MagnifyingFilter.LINEAR)
+        }
+        super.apply(source, target)
+    }
+}