[orx-fx] Add DirectionalBlur

orx-fx/src/commonMain/kotlin/blur/DirectionalBlur.kt

@@ -0,0 +1,53 @@
+package org.openrndr.extra.fx.blur
+
+import org.openrndr.draw.*
+import org.openrndr.extra.fx.fx_directional_blur
+import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.BooleanParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+import org.openrndr.extra.parameters.IntParameter
+
+/**
+ * Directional blur filter. Takes source image and direction buffer inputs
+ */
+@Description("Directional blur")
+class DirectionalBlur : Filter(mppFilterShader(fx_directional_blur, "directional-blur")) {
+
+    /**
+     * The sample window, default is 5
+     */
+    @IntParameter("window size", 1, 25)
+    var window: Int by parameters
+
+    /**
+     * Spread multiplier, default is 1.0
+     */
+    @DoubleParameter("kernel spread", 1.0, 4.0)
+    var spread: Double by parameters
+
+    /**
+     * Post-blur 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?
+     */
+    @BooleanParameter("perpendicular")
+    var perpendicular: Boolean by parameters
+
+    init {
+        window = 5
+        spread = 1.0
+        gain = 1.0
+        perpendicular = false
+    }
+
+    override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
+        parameters["wrapX"] = false
+        parameters["wrapY"] = false
+        super.apply(source, target)
+    }
+}