[orx-dnk3] Add feature architecture and post processing effects

orx-dnk3/src/main/kotlin/post/ScreenspaceReflections.kt

@@ -0,0 +1,38 @@
+package org.openrndr.extra.dnk3.post
+
+import org.openrndr.draw.Filter
+import org.openrndr.draw.Shader
+import org.openrndr.draw.filterShaderFromUrl
+import org.openrndr.math.Matrix44
+import org.openrndr.resourceUrl
+
+class ScreenspaceReflections : Filter(preprocessedFilterShaderFromUrl(resourceUrl("/shaders/screenspace-reflections.frag"))) {
+    var projection: Matrix44 by parameters
+    var projectionMatrixInverse: Matrix44 by parameters
+
+    var colors: Int by parameters
+    var projDepth: Int by parameters
+    var normals: Int by parameters
+
+    var jitterOriginGain: Double by parameters
+    var iterationLimit: Int by parameters
+    var distanceLimit: Double by parameters
+    var gain: Double by parameters
+    var borderWidth: Double by parameters
+
+    init {
+        colors = 0
+        projDepth = 1
+        normals = 2
+
+        projection = Matrix44.IDENTITY
+        projectionMatrixInverse = Matrix44.IDENTITY
+
+        distanceLimit = 100.0
+        iterationLimit = 128
+        jitterOriginGain = 0.0
+
+        gain = 1.0
+        borderWidth = 130.0
+    }
+}

orx-dnk3/src/main/kotlin/post/VolumetricIrradiance.kt

@@ -0,0 +1,45 @@
+package org.openrndr.extra.dnk3.post
+
+import org.openrndr.draw.*
+import org.openrndr.extra.dnk3.features.IrradianceSH
+import org.openrndr.extra.shaderphrases.preprocessShader
+import org.openrndr.math.IntVector3
+import org.openrndr.math.Matrix44
+import org.openrndr.resourceUrl
+import java.net.URL
+
+fun preprocessedFilterShaderFromUrl(url: String): Shader {
+    return filterShaderFromCode( preprocessShader(URL(url).readText()), "filter-shader: $url")
+}
+
+fun preprocessedFilterShaderFromCode(fragmentShaderCode: String, name: String): Shader {
+    return Shader.createFromCode(Filter.filterVertexCode, fragmentShaderCode, name)
+}
+
+class VolumetricIrradiance : Filter(preprocessedFilterShaderFromUrl(resourceUrl("/shaders/volumetric-irradiance.frag"))) {
+
+    var stepLength: Double by parameters
+    var irradianceSH: IrradianceSH? = null
+
+    var viewMatrixInverse: Matrix44 by parameters
+    var projectionMatrixInverse: Matrix44 by parameters
+
+    init {
+        stepLength = 0.1
+        viewMatrixInverse = Matrix44.IDENTITY
+        projectionMatrixInverse = Matrix44.IDENTITY
+    }
+
+    override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
+        irradianceSH?.shMap?.let {
+            parameters["shMap"] = it
+        }
+        irradianceSH?.let {
+            parameters["shMapDimensions"] = IntVector3(it.xCount, it.yCount, it.zCount)
+            parameters["shMapOffset"] = it.offset
+            parameters["shMapSpacing"] = it.spacing
+        }
+        super.apply(source, target)
+    }
+}
+