[orx-fx] Directional blur tweaks (#357)

orx-fx/src/commonMain/kotlin/distort/DirectionalDisplace.kt

@@ -0,0 +1,55 @@
+@file:Suppress("RUNTIME_ANNOTATION_NOT_SUPPORTED")
+
+package org.openrndr.extra.fx.distort
+
+import org.openrndr.draw.Filter2to1
+import org.openrndr.extra.fx.fx_directional_displace
+import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.BooleanParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+/**
+ * Directional displace filter. Takes source image and direction buffer inputs
+ */
+@Description("Directional displace")
+class DirectionalDisplace : Filter2to1(mppFilterShader(fx_directional_displace, "directional-displace")) {
+
+    /**
+     * The distance of the sampled pixel. The default is 1.0
+     */
+    @DoubleParameter("distance", 1.0, 1000.0)
+    var distance: Double by parameters
+
+    /**
+     * Post-displace gain, default is 1.0
+     */
+    @DoubleParameter("gain", 0.0, 4.0)
+    var gain: Double by parameters
+
+    /**
+     * Should filter use directions perpendicular to those in the direction buffer? default is false
+     */
+    @BooleanParameter("perpendicular")
+    var perpendicular: Boolean by parameters
+
+    /**
+     * Wrap around left and right edges
+     */
+    @BooleanParameter("wrapX")
+    var wrapX: Boolean by parameters
+
+    /**
+     * Wrap around top and bottom edges
+     */
+    @BooleanParameter("wrapY")
+    var wrapY: Boolean by parameters
+
+    init {
+        distance = 1.0
+        gain = 1.0
+        perpendicular = false
+        wrapX = false
+        wrapY = false
+    }
+}