[orx-dnk3] Add segmentContourRenderer

orx-dnk3/src/main/kotlin/renderers/SegmentContourRenderer.kt

@@ -0,0 +1,34 @@
+package org.openrndr.extra.dnk3.renderers
+
+import org.openrndr.draw.BufferMultisample
+import org.openrndr.draw.ColorFormat
+import org.openrndr.draw.ColorType
+import org.openrndr.extra.dnk3.*
+import org.openrndr.extra.dnk3.post.SegmentContours
+import org.openrndr.extra.dnk3.post.SegmentContoursMSAA8
+
+fun segmentContourRenderer(multisample: BufferMultisample = BufferMultisample.Disabled): SceneRenderer {
+    val sr = SceneRenderer()
+    sr.outputPasses.clear()
+    sr.outputPasses.add(
+            RenderPass(
+                    listOf(FragmentIDFacet()),
+                    multisample = multisample
+            )
+    )
+    sr.postSteps.add(
+            FilterPostStep(1.0,
+                    when (multisample) {
+                        BufferMultisample.Disabled -> SegmentContours()
+                        BufferMultisample.SampleCount(8) -> SegmentContoursMSAA8()
+                        else -> error("unsupported multisampling mode $multisample")
+                    },
+                    listOf("fragmentID"),
+                    "segments",
+                    ColorFormat.RGB,
+                    ColorType.UINT8
+            )
+    )
+    sr.drawFinalBuffer = true
+    return sr
+}