From 69a0b0c0ce46da983791f846ccc2dbdaf3ada8a3 Mon Sep 17 00:00:00 2001
From: Edwin Jakobs <edwin@rndr.studio>
Date: Tue, 28 Apr 2020 16:36:38 +0200
Subject: [PATCH] Fix ShapeSDF in case no distortion map is given

---
 orx-jumpflood/src/demo/kotlin/DemoShapeSDF03.kt |  1 -
 orx-jumpflood/src/main/kotlin/ShapeSDF.kt       | 12 +++++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/orx-jumpflood/src/demo/kotlin/DemoShapeSDF03.kt b/orx-jumpflood/src/demo/kotlin/DemoShapeSDF03.kt
index 54405bd6..02df9dc7 100644
--- a/orx-jumpflood/src/demo/kotlin/DemoShapeSDF03.kt
+++ b/orx-jumpflood/src/demo/kotlin/DemoShapeSDF03.kt
@@ -39,7 +39,6 @@ fun main() {
                 }
             }
             extend {
-
                 drawer.background(ColorRGBa.PINK)
 
                 fd.apply(emptyArray(), uvmap)
diff --git a/orx-jumpflood/src/main/kotlin/ShapeSDF.kt b/orx-jumpflood/src/main/kotlin/ShapeSDF.kt
index 20d8feda..aed9d4cc 100644
--- a/orx-jumpflood/src/main/kotlin/ShapeSDF.kt
+++ b/orx-jumpflood/src/main/kotlin/ShapeSDF.kt
@@ -14,10 +14,10 @@ class ShapeSDF : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/shape-sdf.
     private var segmentCount = 0
 
     @BooleanParameter("use UV map")
-    var useUV:Boolean by parameters
+    var useUV: Boolean by parameters
 
     @BooleanParameter("rectify distance")
-    var rectify:Boolean by parameters
+    var rectify: Boolean by parameters
 
 
     init {
@@ -53,7 +53,7 @@ class ShapeSDF : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/shape-sdf.
         for (v in from) {
             fromWriter.write(v)
         }
-        fromShadow.upload(0, from.size*4*4)
+        fromShadow.upload(0, from.size * 4 * 4)
 
         val toShadow = toBuffer.shadow
         val toWriter = toShadow.writer()
@@ -61,7 +61,7 @@ class ShapeSDF : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/shape-sdf.
         for (v in to) {
             toWriter.write(v)
         }
-        toShadow.upload(0, to.size*4*4)
+        toShadow.upload(0, to.size * 4 * 4)
 
         segmentCount = from.size
     }
@@ -73,6 +73,8 @@ class ShapeSDF : Filter(filterShaderFromUrl(resourceUrl("/shaders/gl3/shape-sdf.
         parameters["fromBuffer"] = fromBuffer
         parameters["toBuffer"] = toBuffer
         parameters["segmentCount"] = segmentCount
-        super.apply(source, target)
+        // -- bit of an hack
+        val effectiveSource = if (source.isNotEmpty()) source else target
+        super.apply(effectiveSource, target)
     }
 }
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