Add film grain and tonemap filters

orx-fx/src/main/kotlin/grain/FilmGrain.kt

@@ -0,0 +1,26 @@
+import org.openrndr.draw.Filter
+import org.openrndr.draw.Shader
+import org.openrndr.extra.fx.filterFragmentCode
+
+/**
+ * Film grain filter
+ */
+class FilmGrain : Filter(Shader.createFromCode(Filter.filterVertexCode, filterFragmentCode("grain/film-grain.frag"))) {
+    var useColor: Boolean by parameters
+    var time: Double by parameters;
+    var grainLiftRatio: Double by parameters
+    var grainStrength: Double by parameters
+    var grainRate: Double by parameters
+    var grainPitch: Double by parameters
+    var colorLevel: Double by parameters
+
+    init {
+        useColor = false
+        grainLiftRatio = 0.5
+        grainStrength = 1.0
+        grainRate = 1.0
+        grainPitch = 1.0
+        colorLevel = 1.0
+    }
+
+}

orx-fx/src/main/kotlin/tonemap/Uncharted2Tonemap.kt

@@ -0,0 +1,15 @@
+package org.openrndr.extra.fx.tonemap
+
+import org.openrndr.draw.Filter
+import org.openrndr.draw.Shader
+import org.openrndr.extra.fx.filterFragmentCode
+
+/**
+ * Uncharted 2 tonemap filter
+ */
+class Uncharted2Tonemap : Filter(Shader.createFromCode(filterVertexCode, filterFragmentCode("tonemap/uncharted2-tonemap.frag"))) {
+    var exposureBias by parameters
+    init {
+        exposureBias = 2.0
+    }
+}