[orx-fx] convert to MPP

orx-fx/src/commonMain/kotlin/antialias/FXAA.kt

@@ -0,0 +1,44 @@
+package org.openrndr.extra.fx.antialias
+
+import org.openrndr.draw.Filter
+import org.openrndr.extra.fx.fx_fxaa
+import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+/**
+ * FXAA approximate antialiasing filter. Only works on LDR inputs
+ */
+@Description("FXAA")
+class FXAA : Filter( mppFilterShader(fx_fxaa, "fxaa")) {
+    /**
+     * luma threshold, default value is 0.5
+     */
+    @DoubleParameter("luma threshold", 0.0, 1.0)
+    var lumaThreshold: Double by parameters
+
+    /**
+     * max search span, default value is 8.0
+     */
+    @DoubleParameter("max search span", 1.0, 16.0)
+    var maxSpan: Double by parameters
+
+    /**
+     * direction reduce multiplier, default value is 0.0
+     */
+    @DoubleParameter("direction reduce multiplier", 0.0, 1.0)
+    var directionReduceMultiplier: Double by parameters
+
+    /**
+     * direction reduce minimum, default value is 0.0
+     */
+    @DoubleParameter("direction reduce minium", 0.0, 1.0)
+    var directionReduceMinimum: Double by parameters
+
+    init {
+        lumaThreshold = 0.5
+        maxSpan = 8.0
+        directionReduceMinimum = 0.0
+        directionReduceMultiplier = 0.0
+    }
+}