Add ColorTint, LumaThreshold, HorizontalWave, VerticalWave, FrameBlur filters to orx-fx

orx-fx/src/main/kotlin/blur/FrameBlur.kt

@@ -0,0 +1,41 @@
+package org.openrndr.extra.fx.blur
+
+import org.openrndr.draw.*
+import org.openrndr.extra.fx.filterFragmentCode
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+import org.openrndr.extra.parameters.IntParameter
+
+@Description("Frame blur")
+class FrameBlur : Filter(Shader.createFromCode(Filter.filterVertexCode,
+        filterFragmentCode("blur/frame-blur.frag"))) {
+
+    @DoubleParameter("blend", 0.0, 1.0)
+    var blend: Double by parameters
+
+    private var intermediate: ColorBuffer? = null
+
+    init {
+        blend = 0.5
+    }
+
+    override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
+        if (target.isNotEmpty()) {
+            intermediate?.let {
+                if (it.width != target[0].width || it.height != target[0].height) {
+                    it.destroy()
+                    intermediate = null
+                }
+
+            }
+
+            if (intermediate == null) {
+                intermediate = colorBuffer(target[0].width, target[0].height, type = ColorType.FLOAT16)
+            }
+
+            super.apply(arrayOf(source[0], intermediate!!), arrayOf(intermediate!!))
+            intermediate!!.copyTo(target[0])
+        }
+    }
+
+}