Add DistanceField filter to orx-jumpflood

orx-jumpflood/src/main/kotlin/JumpFlood.kt

@@ -3,9 +3,8 @@ package org.openrndr.extra.jumpfill
 import org.openrndr.color.ColorRGBa
 import org.openrndr.draw.*
 import org.openrndr.extra.fx.blend.Passthrough
+import org.openrndr.extra.parameters.DoubleParameter
 
-
-import org.openrndr.math.Matrix44
 import org.openrndr.math.Vector2
 import org.openrndr.resourceUrl
 import kotlin.math.ceil
@@ -21,12 +20,21 @@ class JumpFlood : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/jumpflood
 class PixelDirection : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/pixel-direction.frag"))) {
     var originalSize: Vector2 by parameters
 }
+
 class PixelDistance : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/pixel-distance.frag"))) {
+    var distanceScale: Double by parameters
     var originalSize: Vector2 by parameters
+    var signedBit: Boolean by parameters
+    init {
+        distanceScale = 1.0
+        originalSize = Vector2(512.0, 512.0)
+        signedBit = true
     }
+}
+
 class ContourPoints : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/contour-points.frag")))
 class Threshold : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/threshold.frag"))) {
-    var threshold by parameters
+    var threshold: Double by parameters
 
     init {
         threshold = 0.5
@@ -51,53 +59,35 @@ class JumpFlooder(val width: Int, val height: Int, format:ColorFormat = ColorFor
             listOf(colorBuffer(squareDim, squareDim, format = format, type = type),
                     colorBuffer(squareDim, squareDim, format = format, type = type))
 
-    private val final = renderTarget(width, height) {
-        colorBuffer(format = format, type = type)
+
+    val final = colorBuffer(squareDim, squareDim, format = format, type = type)
+
+    private val square = colorBuffer(squareDim, squareDim, format = format, type = type).apply {
+        fill(ColorRGBa.BLACK)
     }
 
-    val encoded: ColorBuffer get() = final.colorBuffer(0)
 
-    private val square = renderTarget(squareDim, squareDim) {
-        colorBuffer(format = format, type = type)
-    }
-
-    fun jumpFlood(drawer: Drawer, input: ColorBuffer): ColorBuffer {
+    fun jumpFlood(input: ColorBuffer): ColorBuffer {
         if (input.width != width || input.height != height) {
             throw IllegalArgumentException("dimensions mismatch")
         }
 
-        drawer.isolatedWithTarget(square) {
-            drawer.background(ColorRGBa.BLACK)
-            drawer.ortho(square)
-            drawer.view = Matrix44.IDENTITY
-            drawer.model = Matrix44.IDENTITY
-            drawer.image(input)
-        }
-        encodePoints.apply(square.colorBuffer(0), coordinates[0])
+        input.copyTo(square)
+        encodePoints.apply(square, coordinates[0])
 
         for (i in 0 until exp) {
             jumpFlood.step = i
             jumpFlood.apply(coordinates[i % 2], coordinates[(i + 1) % 2])
         }
 
-        drawer.isolatedWithTarget(final) {
-            drawer.background(ColorRGBa.BLACK)
-            drawer.ortho(final)
-            drawer.view = Matrix44.IDENTITY
-            drawer.model = Matrix44.IDENTITY
-            drawer.image(coordinates[exp % 2])
-        }
-        return encoded
+        coordinates[exp % 2].copyTo(final)
+
+        return final
     }
 
     fun destroy() {
         coordinates.forEach { it.destroy() }
-        square.colorBuffer(0).destroy()
-        square.detachColorBuffers()
         square.destroy()
-
-        final.colorBuffer(0).destroy()
-        final.detachColorBuffers()
         final.destroy()
     }
 }
@@ -111,7 +101,7 @@ private fun encodeDecodeBitmap(drawer: Drawer, preprocess: Filter, decoder: Filt
 
     preprocess.apply(bitmap, _result)
 
-    val encoded = _jumpFlooder.jumpFlood(drawer, _result)
+    val encoded = _jumpFlooder.jumpFlood(_result)
 
     decoder.parameters["originalSize"] = Vector2(_jumpFlooder.squareDim.toDouble(), _jumpFlooder.squareDim.toDouble())
     decoder.apply(arrayOf(encoded, bitmap), _result)
@@ -140,3 +130,48 @@ fun directionFieldFromBitmap(drawer: Drawer, bitmap: ColorBuffer,
                              jumpFlooder: JumpFlooder? = null,
                              result: ColorBuffer? = null
 ): ColorBuffer = encodeDecodeBitmap(drawer, contourPoints, pixelDirection, bitmap, jumpFlooder, result)
+
+
+class DistanceField : Filter() {
+
+    @DoubleParameter("threshold", 0.0, 1.0)
+    var threshold = 0.5
+
+    @DoubleParameter("distance scale", 0.0, 1.0)
+    var distanceScale = 1.0
+
+
+
+    private val thresholdFilter = Threshold()
+    private var thresholded: ColorBuffer? = null
+    private val contourFilter = ContourPoints()
+    private var contoured: ColorBuffer? = null
+    private var jumpFlooder: JumpFlooder? = null
+
+    private val decodeFilter = PixelDistance()
+
+    override fun apply(source: Array<ColorBuffer>, target: Array<ColorBuffer>) {
+
+        if (thresholded == null) {
+            thresholded = colorBuffer(target[0].width, target[0].height, format = ColorFormat.R)
+        }
+
+        if (contoured == null) {
+            contoured = colorBuffer(target[0].width, target[0].height, format = ColorFormat.R)
+        }
+
+        if (jumpFlooder == null) {
+            jumpFlooder = JumpFlooder(target[0].width, target[0].height)
+        }
+
+        thresholdFilter.threshold = threshold
+        thresholdFilter.apply(source[0], thresholded!!)
+        contourFilter.apply(thresholded!!, contoured!!)
+        val result = jumpFlooder!!.jumpFlood(contoured!!)
+        decodeFilter.originalSize = Vector2(target[0].width * 1.0, target[0].height * 1.0)
+        decodeFilter.distanceScale = distanceScale
+        decodeFilter.signedBit = false
+        decodeFilter.apply(result, result)
+        result.copyTo(target[0])
+    }
+}

orx-jumpflood/src/main/resources/shaders/gl3/pixel-distance.frag

@@ -4,6 +4,8 @@ uniform sampler2D tex0;
 uniform sampler2D tex1;
 
 uniform vec2 originalSize;
+uniform float distanceScale;
+uniform bool signedBit;
 
 in vec2 v_texCoord0;
 
@@ -12,12 +14,16 @@ out vec4 o_color;
 void main() {
     vec2 size = textureSize(tex0, 0);
     vec2 fixUp = v_texCoord0;
-    fixUp.y = 1.0 - fixUp.y;
-    fixUp *= (size/originalSize);
-    fixUp.y = 1.0 - fixUp.y;
+
+
+
     vec2 pixelPosition = fixUp;
     vec2 centroidPixelPosition = texture(tex0, v_texCoord0).xy;
     vec2 pixelDistance = (centroidPixelPosition - pixelPosition) * size * vec2(1.0, -1.0);
     float threshold = texture(tex1, v_texCoord0).r;
-    o_color = vec4(length(pixelDistance), threshold, 0.0, 1.0);
+    if (signedBit) {
+        o_color = vec4(length(pixelDistance)* distanceScale, threshold, 0.0, 1.0);
+    }  else {
+        o_color = vec4(vec3(length(pixelDistance) * distanceScale), 1.0);
+    }
 }