[orx-fx] convert to MPP

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

@@ -0,0 +1,38 @@
+package org.openrndr.extra.fx.distort
+
+import org.openrndr.draw.*
+import org.openrndr.extra.fx.fx_fisheye
+import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+@Description("Fisheye")
+class Fisheye : Filter(mppFilterShader(fx_fisheye, "fisheye")) {
+    @DoubleParameter("strength", -1.0, 1.0, order = 0)
+    var strength: Double by parameters
+
+    @DoubleParameter("scale", 0.0, 2.0, order = 0)
+    var scale: Double by parameters
+
+    @DoubleParameter("feather", 0.0, 100.0, order = 1)
+    var feather: Double by parameters
+
+    @DoubleParameter("rotation", -180.0, 180.0, order = 1)
+    var rotation: Double by parameters
+
+    init {
+        strength = 0.1
+        feather = 1.0
+        scale = 1.0
+        rotation = 0.0
+    }
+
+    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)
+    }
+}