Add new compositor demo for multisampling

orx-compositor/src/demo/kotlin/DemoCompositor02.kt

@@ -0,0 +1,50 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.BufferMultisample
+import org.openrndr.extra.compositor.blend
+import org.openrndr.extra.compositor.compose
+import org.openrndr.extra.compositor.draw
+import org.openrndr.extra.compositor.layer
+import org.openrndr.extra.fx.blend.Normal
+import org.openrndr.math.Vector2
+import org.openrndr.shape.Rectangle
+
+/**
+ * Demonstration of using [BufferMultisample] on a per layer basis.
+ * Try changing which layer has multisampling applied and observe the results.
+ */
+fun main() = application {
+    configure {
+        width = 800
+        height = 800
+    }
+
+    program {
+        val layers = compose {
+            layer(BufferMultisample.SampleCount(16)) {
+                draw {
+                    drawer.translate(drawer.bounds.center)
+                    drawer.rotate(seconds)
+                    drawer.fill = ColorRGBa.PINK
+                    drawer.rectangle(Rectangle.fromCenter(Vector2.ZERO, 200.0))
+                }
+
+                layer() {
+                    blend(Normal()) {
+                        clip = true
+                    }
+                    draw {
+                        drawer.rotate(seconds * -2)
+                        drawer.fill = ColorRGBa.WHITE
+                        drawer.rectangle(Rectangle.fromCenter(Vector2.ZERO, 200.0))
+                    }
+                }
+            }
+        }
+
+        extend {
+            drawer.clear(ColorRGBa.WHITE)
+            layers.draw(drawer)
+        }
+    }
+}