Add orx-poisson-fill

orx-poisson-fill/src/main/kotlin/PoissonFiller.kt

@@ -0,0 +1,32 @@
+package org.openrndr.poissonfill
+
+import org.openrndr.draw.*
+import org.openrndr.resourceUrl
+
+internal class FillBoundary : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/poisson/fill-boundary.frag")))
+internal class FillCombine : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/poisson/fill-combine.frag")))
+
+class PoissonFiller(width: Int, height: Int, type: ColorType = ColorType.FLOAT32) {
+    private val pyramid = ConvolutionPyramid(width, height, 0, type = type)
+    private val preproc = colorBuffer(width, height, type = type)
+    private val combined = colorBuffer(width, height, type = type)
+    private val fillBoundary = FillBoundary()
+    private val fillCombine = FillCombine()
+
+    private val h1 = floatArrayOf(0.1507146f, 0.6835785f, 1.0334191f, 0.6836f, 0.1507f)
+    private val h2 = 0.0269546f
+    private val g = floatArrayOf(0.0311849f, 0.7752854f, 0.0311849f)
+
+    init {
+        pyramid.h1 = h1
+        pyramid.g = g
+        pyramid.h2 = h2
+    }
+
+    fun process(input: ColorBuffer): ColorBuffer {
+        fillBoundary.apply(input, preproc)
+        val result = pyramid.process(preproc)
+        fillCombine.apply(arrayOf(result, input), arrayOf(combined))
+        return combined
+    }
+}