From eff91a9e29fc97d7e5051d9900e79ba9d044fb3a Mon Sep 17 00:00:00 2001
From: Sven Göthel <sgothel@jausoft.com>
Date: Mon, 5 Feb 2024 17:23:41 +0100
Subject: GraphUI: Add Shape.IO_DISCARDED and update it @ Scene/Group draw();
 Prepare for experimental occlusion-culling

TreeTool's cullShapes(), actually a naive dumm occlusion test (*RENAME IT*),
would need to realize whether the shape/groups actually cover shapes below,
i.e. are not on same Z-Axis and transparent.

Hence, this is disabled in code and we rely on the Z buffer still,
just an idea ..
---
 src/graphui/classes/com/jogamp/graph/ui/Group.java | 11 ++++++--
 src/graphui/classes/com/jogamp/graph/ui/Scene.java |  6 ++++-
 src/graphui/classes/com/jogamp/graph/ui/Shape.java | 15 +++++++++--
 src/graphui/classes/jogamp/graph/ui/TreeTool.java  | 30 ++++++++++++++++++++++
 4 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/src/graphui/classes/com/jogamp/graph/ui/Group.java b/src/graphui/classes/com/jogamp/graph/ui/Group.java
index 245400700..f482605ea 100644
--- a/src/graphui/classes/com/jogamp/graph/ui/Group.java
+++ b/src/graphui/classes/com/jogamp/graph/ui/Group.java
@@ -399,6 +399,7 @@ public class Group extends Shape implements Container {
         final Shape[] shapeArray = shapes.toArray(drawShapeArray); // local-backup
         drawShapeArray = shapeArray; // keep backup
         Arrays.sort(shapeArray, 0, shapeCount, Shape.ZAscendingComparator);
+        // TreeTool.cullShapes(shapeArray, shapeCount);
 
         final List<Shape> iShapes = renderedShapes == renderedShapesB0 ? renderedShapesB1 : renderedShapesB0;
         iShapes.clear();
@@ -412,7 +413,7 @@ public class Group extends Shape implements Container {
 
             for(int i=0; i<shapeCount; i++) {
                 final Shape shape = shapeArray[i];
-                if( shape.isVisible() ) {
+                if( shape.isVisible() ) { // && !shape.isDiscarded() ) {
                     pmv.pushMv();
                     shape.applyMatToMv(pmv);
 
@@ -424,6 +425,9 @@ public class Group extends Shape implements Container {
                     {
                         shape.draw(gl, renderer);
                         iShapes.add(shape);
+                        shape.setDiscarded(false);
+                    } else {
+                        shape.setDiscarded(true);
                     }
                     pmv.popMv();
                 }
@@ -432,12 +436,15 @@ public class Group extends Shape implements Container {
         } else {
             for(int i=0; i<shapeCount; i++) {
                 final Shape shape = shapeArray[i];
-                if( shape.isVisible() ) {
+                if( shape.isVisible() ) { // && !shape.isDiscarded() ) {
                     pmv.pushMv();
                     shape.applyMatToMv(pmv);
                     if( !doFrustumCulling || !pmv.getFrustum().isOutside( shape.getBounds() ) ) {
                         shape.draw(gl, renderer);
                         iShapes.add(shape);
+                        shape.setDiscarded(false);
+                    } else {
+                        shape.setDiscarded(true);
                     }
                     pmv.popMv();
                 }
diff --git a/src/graphui/classes/com/jogamp/graph/ui/Scene.java b/src/graphui/classes/com/jogamp/graph/ui/Scene.java
index b515a55e6..ff1bebbd5 100644
--- a/src/graphui/classes/com/jogamp/graph/ui/Scene.java
+++ b/src/graphui/classes/com/jogamp/graph/ui/Scene.java
@@ -488,6 +488,7 @@ public final class Scene implements Container, GLEventListener {
         final Shape[] shapeArray = shapes.toArray(displayShapeArray); // local-backup
         displayShapeArray = shapeArray; // keep backup
         Arrays.sort(shapeArray, 0, shapeCount, Shape.ZAscendingComparator);
+        // TreeTool.cullShapes(shapeArray, shapeCount);
 
         final List<Shape> iShapes = renderedShapes == renderedShapesB0 ? renderedShapesB1 : renderedShapesB0;
         iShapes.clear();
@@ -504,13 +505,16 @@ public final class Scene implements Container, GLEventListener {
 
         for(int i=0; i<shapeCount; i++) {
             final Shape shape = shapeArray[i];
-            if( shape.isVisible() ) {
+            if( shape.isVisible() ) { // && !shape.isDiscarded() ) {
                 pmv.pushMv();
                 shape.applyMatToMv(pmv);
 
                 if( !doFrustumCulling || !pmv.getFrustum().isOutside( shape.getBounds() ) ) {
                     shape.draw(gl, renderer);
                     iShapes.add(shape);
+                    shape.setDiscarded(false);
+                } else {
+                    shape.setDiscarded(true);
                 }
                 pmv.popMv();
             }
diff --git a/src/graphui/classes/com/jogamp/graph/ui/Shape.java b/src/graphui/classes/com/jogamp/graph/ui/Shape.java
index 183f8901e..6e5a904ee 100644
--- a/src/graphui/classes/com/jogamp/graph/ui/Shape.java
+++ b/src/graphui/classes/com/jogamp/graph/ui/Shape.java
@@ -270,6 +270,7 @@ public abstract class Shape {
     private static final int IO_RESIZABLE          = 1 << 5;
     private static final int IO_RESIZE_FIXED_RATIO = 1 << 6;
     private static final int IO_ACTIVE             = 1 << 7;
+    private static final int IO_DISCARDED          = 1 << 25;
     private static final int IO_DOWN               = 1 << 26;
     private static final int IO_TOGGLE             = 1 << 27;
     private static final int IO_DRAG_FIRST         = 1 << 28;
@@ -1523,12 +1524,13 @@ public abstract class Shape {
         } else {
             rotateS = "";
         }
-        final String activeS = ", active["+(isIO(IO_ACTIVE) ? "SELF," : "")+(isGroup() && isActive()?"GROUP":"")+", adjZ "+getAdjustedZ()+"]";
+        final String discS = isDiscarded()?", DISCARDED":"";
+        final String activeS = isActive()?", ACTIVE[adjZ "+getAdjustedZ()+"]":"";
         final String ps = hasPadding() ? padding.toString()+", " : "";
         final String bs = hasBorder() ? "border[l "+getBorderThickness()+", c "+getBorderColor()+"], " : "";
         final String idS = -1 != id ? ", id "+id : "";
         final String nameS = "noname" != name ? ", '"+name+"'" : "";
-        return getDirtyString()+idS+nameS+", visible "+isIO(IO_VISIBLE)+activeS+", toggle "+isIO(IO_TOGGLE)+
+        return getDirtyString()+idS+nameS+", visible "+isIO(IO_VISIBLE)+discS+activeS+", toggle "+isIO(IO_TOGGLE)+
                ", able[toggle "+isIO(IO_TOGGLEABLE)+", iactive "+isInteractive()+", resize "+isResizable()+", drag "+this.isDraggable()+
                "], pos["+position+"], "+pivotS+scaleS+rotateS+iMatS+
                 ps+bs+"box"+box;
@@ -1708,6 +1710,15 @@ public abstract class Shape {
     /** Returns if this shape is allowed to be activated, i.e become {@link #isActive()}. */
     public final boolean isActivable() { return isIO(IO_ACTIVABLE); }
 
+    /**
+     * Set whether this shape is discarded in last {@link #draw(GL2ES2, RegionRenderer)},
+     * i.e. culled via frustum or occlusion criteria.
+     */
+    public final Shape setDiscarded(final boolean v) { return setIO(IO_DISCARDED, v); }
+
+    /** Returns whether this shape is discarded in last {@link #draw(GL2ES2, RegionRenderer)}, i.e. culled via frustum or occlusion criteria.*/
+    public final boolean isDiscarded() { return isIO(IO_DISCARDED); }
+
     /**
      * Set whether this shape is draggable,
      * i.e. translated by 1-pointer-click and drag.
diff --git a/src/graphui/classes/jogamp/graph/ui/TreeTool.java b/src/graphui/classes/jogamp/graph/ui/TreeTool.java
index dcb847932..979c6a3b1 100644
--- a/src/graphui/classes/jogamp/graph/ui/TreeTool.java
+++ b/src/graphui/classes/jogamp/graph/ui/TreeTool.java
@@ -27,6 +27,7 @@
  */
 package jogamp.graph.ui;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.List;
@@ -36,6 +37,7 @@ import com.jogamp.graph.ui.Scene;
 import com.jogamp.graph.ui.Shape;
 import com.jogamp.graph.ui.Shape.Visitor1;
 import com.jogamp.graph.ui.Shape.Visitor2;
+import com.jogamp.math.geom.AABBox;
 import com.jogamp.math.util.PMVMatrix4f;
 
 /** Generic static {@link Shape} tree traversal tools, utilized by {@link Scene} and {@link Container} implementations. */
@@ -245,4 +247,32 @@ public class TreeTool {
         });
         return res[0];
     }
+
+    public static boolean isCovered(final List<AABBox> coverage, final AABBox box) {
+        for(final AABBox b : coverage) {
+            if( b.contains(box) ) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static void cullShapes(final Shape[] shapesZAsc, final int shapeCount) {
+        final List<AABBox> coverage = new ArrayList<AABBox>();
+        for(int i=shapeCount-1; i>=0; --i) {
+            final Shape s = shapesZAsc[i];
+            if( coverage.size() == 0 ) {
+                coverage.add(s.getBounds());
+                s.setDiscarded(false);
+            } else {
+                final AABBox b = s.getBounds();
+                if( isCovered(coverage, b) ) {
+                    s.setDiscarded(true);
+                } else {
+                    coverage.add(b);
+                    s.setDiscarded(false);
+                }
+            }
+        }
+    }
 }
-- 
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