checkpoint

[anneal.git] / src / edu / berkeley / qfat / Viewer.java

diff --git a/src/edu/berkeley/qfat/Viewer.java b/src/edu/berkeley/qfat/Viewer.java
index b39f2a6..2ec797f 100644 (file)
--- a/src/edu/berkeley/qfat/Viewer.java
+++ b/src/edu/berkeley/qfat/Viewer.java
@@ -14,11 +14,12 @@ import edu.berkeley.qfat.geom.Point;
 public abstract class Viewer implements GLEventListener, MouseListener, MouseMotionListener, KeyListener, MouseWheelListener  {
 
     Mesh.Vertex closest = null;
-    Matrix projection = null;
 
     public Mesh tile = new Mesh(false);
     public Mesh goal = new Mesh(false);
 
+    private Matrix projection = null;
+
     JFrame f;
     GLCanvas glcanvas;
     Point clickPoint = null;
@@ -73,12 +74,47 @@ public abstract class Viewer implements GLEventListener, MouseListener, MouseMot
     }
 
     public abstract void _display(GLAutoDrawable drawable, GL gl);
-    public void display(GLAutoDrawable drawable) {
+    public final void display(GLAutoDrawable drawable) {
         GL gl = drawable.getGL();
         _display(drawable, gl);
-        this.projection = Matrix.getProjectionMatrix(gl);
+        projection = Matrix.getProjectionMatrix(gl);
     }
 
+    protected void updateVisibility(GL gl, Mesh mesh) {
+        Matrix projection = Matrix.getProjectionMatrix(gl);
+        IntBuffer buf = ByteBuffer.allocateDirect(9*4*4).order(ByteOrder.nativeOrder()).asIntBuffer();
+        gl.glColor3f(0,0,0);
+        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+        synchronized(this) {
+            for(Mesh.T t : mesh) t.glTriangle(gl, null);
+            for(Mesh.Vertex v : mesh.vertices()) {
+                Point p = v.getPoint();
+                gl.glColor3f(1,1,1);
+                gl.glBegin(gl.GL_POINTS);
+                p.glVertex(gl);
+                gl.glEnd();
+                gl.glFlush();
+
+                Point projected = projection.times(p);
+                gl.glReadPixels((int)projected.x-1, (int)projected.y-1, 3, 3, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, buf);
+
+                boolean vis = false;
+                for(int j=0; j<9*4; j++) vis |= buf.get(j)!=0;
+                v.visible = vis;
+                if (vis) {
+                    gl.glColor3f(0,0,0);
+                    gl.glBegin(gl.GL_POINTS);
+                    p.glVertex(gl);
+                    gl.glEnd();
+                }
+            }
+        }
+        gl.glShadeModel(GL.GL_SMOOTH);
+        gl.glEnable(GL.GL_LIGHTING);
+        gl.glDrawBuffer(GL.GL_FRONT);
+    }
+
+
     /** return the position of the mouse as a point in window-space */
     public Point getMouse() {
         return new Point(mousex, glcanvas.getHeight()-mousey, 0);