Split up net.java.games.util; moved GLUT and BufferUtils into

net.java.games.jogl.util, and moved demo-specific utility classes into
jogl-demos project under demos.util. Added nearly all JavaOne demos
into jogl-demos project; rewrote where necessary to use
ClassLoader.getResourceAsStream() instead of flat files, put into
packages and added to Makefile. Added gleem to jogl-demos project.
Added jogl.jar build rule.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@12 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 0 insertions, 692 deletions

diff --git a/demos/vertexArrayRange/VertexArrayRange.java b/demos/vertexArrayRange/VertexArrayRange.java
deleted file mode 100644
index 2a57413f9..000000000
--- a/demos/vertexArrayRange/VertexArrayRange.java
+++ /dev/null
@@ -1,692 +0,0 @@
-import java.awt.*;
-import java.awt.event.*;
-import java.nio.*;
-import java.util.*;
-
-import net.java.games.jogl.*;
-
-/** <P> A port of NVidia's [tm] Vertex Array Range demonstration to
-    OpenGL[tm] for Java[tm] and the Java programming language. The
-    current web site for the demo (which does not appear to contain
-    the original C++ source code for this demo) is <a href =
-    "http://developer.nvidia.com/view.asp?IO=Using_GL_NV_fence">here</a>. </P>
-
-    <P> This demonstration requires the following:
-
-    <ul>
-    <li> A JDK 1.4 implementation
-    <li> an NVidia GeForce-based card
-    <li> a recent set of drivers
-    </ul>
-
-    </P>
-
-    <P> This demonstration illustrates the effective use of the
-    java.nio direct buffer classes in JDK 1.4 to access memory outside
-    of the Java garbage-collected heap, in particular that returned
-    from the NVidia-specific routine wglAllocateMemoryNV. This memory
-    region is used in conjunction with glVertexArrayRangeNV. </P>
-
-    <P> On a 750 MHz PIII with an SDRAM memory bus and a GeForce 256
-    running the Java HotSpot[tm] Client VM and OpenGL for Java 2.8,
-    this demonstration attains 90% of the speed of the compiled C++
-    code, with a frame rate of 27 FPS, compared to 30 FPS for the C++
-    version. On higher-end hardware (a dual 667 MHz PIII with RDRAM
-    and a GeForce 2) the demo currently attains between 65% and 75% of
-    C++ speed with the HotSpot Client and Server compilers,
-    respectively. </P> */
-
-public class VertexArrayRange {
-  private boolean[] b = new boolean[256];
-  private static final int SIZEOF_FLOAT = 4;
-  private static final int STRIP_SIZE  = 48;
-  private int tileSize   = 9 * STRIP_SIZE;
-  private int numBuffers = 4;
-  private int bufferLength = 1000000;
-  private int bufferSize   = bufferLength * SIZEOF_FLOAT;
-  private static final int SIN_ARRAY_SIZE = 1024;
-
-  private FloatBuffer bigArrayVar;
-  private FloatBuffer bigArraySystem;
-  private FloatBuffer bigArray;
-  private int[][]    elements;
-  private float[]    xyArray;
-
-  static class VarBuffer {
-    public FloatBuffer vertices;
-    public FloatBuffer normals;
-    public int        fence;
-  }
-  private VarBuffer[] buffers;
-
-  private float[] sinArray;
-  private float[] cosArray;
-
-  // Primitive: GL_QUAD_STRIP, GL_LINE_STRIP, or GL_POINTS
-  private int primitive = GL.GL_QUAD_STRIP;
-
-  // Animation parameters
-  private float hicoef = .06f;
-  private float locoef = .10f;
-  private float hifreq = 6.1f;
-  private float lofreq = 2.5f;
-  private float phaseRate = .02f;
-  private float phase2Rate = -0.12f;
-  private float phase  = 0;
-  private float phase2 = 0;
-
-  // Temporaries for computation
-  float[] ysinlo = new float[STRIP_SIZE];
-  float[] ycoslo = new float[STRIP_SIZE];
-  float[] ysinhi = new float[STRIP_SIZE];
-  float[] ycoshi = new float[STRIP_SIZE];
-
-  // For thread-safety when dealing with keypresses
-  private volatile boolean toggleVAR           = false;
-  private volatile boolean toggleLighting      = false;
-  private volatile boolean toggleLightingModel = false;
-  private volatile boolean recomputeElements   = false;
-  private volatile boolean quit                = false;
-
-  // Frames-per-second computation
-  private boolean firstProfiledFrame;
-  private int     profiledFrameCount;
-  private int     numDrawElementsCalls;
-  private long startTimeMillis;
-
-  private GLCanvas canvas = null;
-
-  static class PeriodicIterator {
-    public PeriodicIterator(int arraySize,
-                            float period,
-                            float initialOffset,
-                            float delta) {
-      float arrayDelta =  arraySize * (delta / period); // floating-point steps-per-increment
-      increment = (int)(arrayDelta * (1<<16));          // fixed-point steps-per-increment
-
-      float offset = arraySize * (initialOffset / period); // floating-point initial index
-      initOffset = (int)(offset * (1<<16));                // fixed-point initial index
-
-        arraySizeMask = 0;
-        int i = 20; // array should be reasonably sized...
-        while((arraySize & (1<<i)) == 0) {
-          i--;
-        }
-        arraySizeMask = (1<<i)-1;
-        index = initOffset;
-    }
-
-    public PeriodicIterator(PeriodicIterator arg) {
-      this.arraySizeMask = arg.arraySizeMask;
-      this.increment = arg.increment;
-      this.initOffset = arg.initOffset;
-      this.index = arg.index;
-    }
-
-    public int getIndex() {
-      return (index >> 16) & arraySizeMask;
-    }
-
-    public void incr() {
-      index += increment;
-    }
-
-    public void decr() {
-      index -= increment;
-    }
-
-    public void reset() {
-      index = initOffset;
-    }
-
-    //----------------------------------------------------------------------
-    // Internals only below this point
-    //
-
-    private int arraySizeMask;
-    // fraction bits == 16
-    private int increment;
-    private int initOffset;
-    private int index;
-  }
-
-  public static void usage(String className) {
-    System.out.println("usage: java " + className + " [-slow]");
-    System.out.println("-slow flag starts up using data in the Java heap");
-    System.exit(0);
-  }
-
-  public static void main(String[] args) {
-    new VertexArrayRange().run(args);
-  }
-
-  public void run(String[] args) {
-    boolean startSlow = false;
-
-    if (args.length > 1) {
-      usage(getClass().getName());
-    }
-
-    if (args.length == 1) {
-      if (args[0].equals("-slow")) {
-        startSlow = true;
-      } else {
-        usage(getClass().getName());
-      }
-    }
-
-    if (!startSlow) {
-      setFlag('v', true);   // VAR on
-    }
-    setFlag(' ', true);   // animation on
-    setFlag('i', true);   // infinite viewer and light
-
-    canvas = GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
-    //    canvas.setGL(new TraceGL(canvas.getGL(), System.err));
-    //    canvas.setGL(new DebugGL(canvas.getGL()));
-    VARListener listener = new VARListener();
-    canvas.addGLEventListener(listener);
-
-    final Animator animator = new Animator(canvas);
-
-    Frame frame = new Frame("Very Simple NV_vertex_array_range demo");
-    frame.setLayout(new BorderLayout());
-    canvas.setSize(800, 800);
-    frame.add(canvas, BorderLayout.CENTER);
-    frame.pack();
-    frame.show();
-    canvas.requestFocus();
-
-    frame.addWindowListener(new WindowAdapter() {
-        public void windowClosing(WindowEvent e) {
-          animator.stop();
-          System.exit(0);
-        }
-      });
-
-    animator.start();
-  }
-
-  //----------------------------------------------------------------------
-  // Internals only below this point
-  //
-
-  private void setFlag(char key, boolean val) {
-    b[((int) key) & 0xFF] = val;
-  }
-
-  private boolean getFlag(char key) {
-    return b[((int) key) & 0xFF];
-  }
-
-  private void ensurePresent(String function) {
-    if (!canvas.getGL().isFunctionAvailable(function)) {
-      throw new RuntimeException("OpenGL routine \"" + function + "\" not available");
-    }
-  }
-
-  class VARListener implements GLEventListener {
-    boolean exiting = false;
-
-    public void init(GLDrawable drawable) {
-      GL  gl  = drawable.getGL();
-      GLU glu = drawable.getGLU();
-
-      // Try and disable synch-to-retrace for fastest framerate
-      if (gl.isFunctionAvailable("wglSwapIntervalEXT")) {
-        System.err.println("wglSwapIntervalEXT available; disabling sync-to-refresh for best framerate");
-        gl.wglSwapIntervalEXT(0);       
-      }
-      else {    
-        System.err.println("wglSwapIntervalEXT not available; cannot disable sync-to-refresh");
-      }
-
-      try {
-        ensurePresent("glVertexArrayRangeNV");
-        ensurePresent("glGenFencesNV");
-        ensurePresent("glSetFenceNV");
-        ensurePresent("glTestFenceNV");
-        ensurePresent("glFinishFenceNV");
-        ensurePresent("glAllocateMemoryNV");
-      } catch (RuntimeException e) {
-        runExit();
-        throw (e);
-      }      
-      
-      gl.glEnable(GL.GL_DEPTH_TEST);
-
-      gl.glClearColor(0, 0, 0, 0);
-
-      gl.glEnable(GL.GL_LIGHT0);
-      gl.glEnable(GL.GL_LIGHTING);
-      gl.glEnable(GL.GL_NORMALIZE);
-      gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT, new float[]  {.1f, .1f,    0, 1});
-      gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_DIFFUSE, new float[]  {.6f, .6f,  .1f, 1});
-      gl.glMaterialfv(GL.GL_FRONT_AND_BACK, GL.GL_SPECULAR, new float[] { 1,    1, .75f, 1});
-      gl.glMaterialf(GL.GL_FRONT_AND_BACK, GL.GL_SHININESS, 128.f);
-
-      gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, new float[] { .5f, 0, .5f, 0});
-      gl.glLightModeli(GL.GL_LIGHT_MODEL_LOCAL_VIEWER, 0);
-
-      // NOTE: it looks like GLUT (or something else) sets up the
-      // projection matrix in the C version of this demo.
-      gl.glMatrixMode(GL.GL_PROJECTION);
-      gl.glLoadIdentity();
-      glu.gluPerspective(60, 1.0, 0.1, 100);
-      gl.glMatrixMode(GL.GL_MODELVIEW);
-
-      allocateBigArray(gl, true);
-      allocateBuffersAndFences(gl);
-
-      sinArray = new float[SIN_ARRAY_SIZE];
-      cosArray = new float[SIN_ARRAY_SIZE];
-
-      for (int i = 0; i < SIN_ARRAY_SIZE; i++) {
-        double step = i * 2 * Math.PI / SIN_ARRAY_SIZE;
-        sinArray[i] = (float) Math.sin(step);
-        cosArray[i] = (float) Math.cos(step);
-      }
-
-      if (getFlag('v')) {
-        gl.glEnableClientState(GL.GL_VERTEX_ARRAY_RANGE_NV);
-        gl.glVertexArrayRangeNV(bufferSize, bigArrayVar);
-        bigArray = bigArrayVar;
-      } else {
-        bigArray = bigArraySystem;
-      }
-      setupBuffers();
-      gl.glEnableClientState(GL.GL_VERTEX_ARRAY);
-      gl.glEnableClientState(GL.GL_NORMAL_ARRAY);
-
-      computeElements();
-
-      drawable.addKeyListener(new KeyAdapter() {
-          public void keyTyped(KeyEvent e) {
-            dispatchKey(e.getKeyChar());
-          }
-        });
-    }
-
-    private void allocateBuffersAndFences(GL gl) {
-      buffers = new VarBuffer[numBuffers];
-      int[] fences = new int[1];
-      for (int i = 0; i < numBuffers; i++) {
-        buffers[i] = new VarBuffer();
-        gl.glGenFencesNV(1, fences);
-        buffers[i].fence = fences[0];
-      }
-    }
-
-    private void setupBuffers() {
-      int sliceSize = bufferLength / numBuffers;
-      for (int i = 0; i < numBuffers; i++) {
-        int startIndex = i * sliceSize;
-        buffers[i].vertices = sliceBuffer(bigArray, startIndex, sliceSize);
-        buffers[i].normals  = sliceBuffer(buffers[i].vertices, 3,
-                                          buffers[i].vertices.limit() - 3);
-      }
-    }
-
-    private void dispatchKey(char k) {
-      setFlag(k, !getFlag(k));
-      // Quit on escape or 'q'
-      if ((k == (char) 27) || (k == 'q')) {
-        runExit();
-      }
-
-      if (k == 'r') {
-        if (getFlag(k)) {
-          profiledFrameCount = 0;
-          numDrawElementsCalls = 0;
-          firstProfiledFrame = true;
-        }
-      }
-
-      if (k == 'w') {
-        if (getFlag(k)) {
-          primitive = GL.GL_LINE_STRIP;
-        } else {
-          primitive = GL.GL_QUAD_STRIP;
-        }
-      }
-
-      if (k == 'p') {
-        if (getFlag(k)) {
-          primitive = GL.GL_POINTS;
-        } else {
-          primitive = GL.GL_QUAD_STRIP;
-        }
-      }
-
-      if (k == 'v') {
-        toggleVAR = true;
-      }
-
-      if (k == 'd') {
-        toggleLighting = true;
-      }
-
-      if (k == 'i') {
-        toggleLightingModel = true;
-      }
-
-      if('h'==k)
-        hicoef += .005;
-      if('H'==k)
-        hicoef -= .005;
-      if('l'==k)
-        locoef += .005;
-      if('L'==k)
-        locoef -= .005;
-      if('1'==k)
-        lofreq += .1f;
-      if('2'==k)
-        lofreq -= .1f;
-      if('3'==k)
-        hifreq += .1f;
-      if('4'==k)
-        hifreq -= .1f;
-      if('5'==k)
-        phaseRate += .01f;
-      if('6'==k)
-        phaseRate -= .01f;
-      if('7'==k)
-        phase2Rate += .01f;
-      if('8'==k)
-        phase2Rate -= .01f;
-
-      if('t'==k) {
-        if(tileSize < 864) {
-          tileSize += STRIP_SIZE;
-          recomputeElements = true;
-          System.err.println("tileSize = " + tileSize);
-        }
-      }
-
-      if('T'==k) {
-        if(tileSize > STRIP_SIZE) {
-          tileSize -= STRIP_SIZE;
-          recomputeElements = true;
-          System.err.println("tileSize = " + tileSize);
-        }
-      }
-    }
-
-    public void display(GLDrawable drawable) {
-      // Don't try to do OpenGL operations if we're tearing things down
-      if (quit) {
-        return;
-      }
-
-      GL  gl  = drawable.getGL();
-      GLU glu = drawable.getGLU();
-
-      // Check to see whether to animate
-      if (getFlag(' ')) {
-        phase += phaseRate;
-        phase2 += phase2Rate;
-
-        if (phase > (float) (20 * Math.PI)) {
-          phase = 0;
-        }
-
-        if (phase2 < (float) (-20 * Math.PI)) {
-          phase2 = 0;
-        }
-      }
-
-      PeriodicIterator loX =
-        new PeriodicIterator(SIN_ARRAY_SIZE, (float) (2 * Math.PI), phase, (float) ((1.f/tileSize)*lofreq*Math.PI));
-      PeriodicIterator loY = new PeriodicIterator(loX);
-      PeriodicIterator hiX =
-        new PeriodicIterator(SIN_ARRAY_SIZE, (float) (2 * Math.PI), phase2, (float) ((1.f/tileSize)*hifreq*Math.PI));
-      PeriodicIterator hiY = new PeriodicIterator(hiX);
-
-      if (toggleVAR) {
-        if (getFlag('v')) {
-          gl.glEnableClientState(GL.GL_VERTEX_ARRAY_RANGE_NV);
-          gl.glVertexArrayRangeNV(bufferSize, bigArrayVar);
-          bigArray = bigArrayVar;
-        } else {
-          gl.glDisableClientState(GL.GL_VERTEX_ARRAY_RANGE_NV);
-          bigArray = bigArraySystem;
-        }
-        toggleVAR = false;
-        setupBuffers();
-      }
-
-      if (toggleLighting) {
-        if (getFlag('d')) {
-          gl.glDisable(GL.GL_LIGHTING);
-        } else {
-          gl.glEnable(GL.GL_LIGHTING);
-        }
-        toggleLighting = false;
-      }
-
-      if (toggleLightingModel) {
-        if(getFlag('i')) {
-          // infinite light
-          gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, new float[] { .5f, 0, .5f, 0 });
-          gl.glLightModeli(GL.GL_LIGHT_MODEL_LOCAL_VIEWER, 0);
-        } else {
-          gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, new float[] { .5f, 0, -.5f,1 });
-          gl.glLightModeli(GL.GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
-        }
-        toggleLightingModel = false;
-      }
-
-      if (recomputeElements) {
-        computeElements();
-        recomputeElements = false;
-      }
-
-      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
-
-      gl.glPushMatrix();
-
-      final float[] modelViewMatrix = new float[] {
-          1, 0, 0, 0,
-          0, 1, 0, 0,
-          0, 0, 1, 0,
-          0, 0, -1, 1
-      };
-      gl.glLoadMatrixf(modelViewMatrix);
-
-      // FIXME: add mouse interaction
-      // camera.apply_inverse_transform();
-      // object.apply_transform();
-
-      int cur = 0;
-      int numSlabs = tileSize / STRIP_SIZE;
-
-      for(int slab = numSlabs; --slab>=0; ) {
-        cur = slab % numBuffers;
-        if (slab >= numBuffers) {
-          if (!gl.glTestFenceNV(buffers[cur].fence)) {
-            gl.glFinishFenceNV(buffers[cur].fence);
-          }
-        }
-
-        FloatBuffer v = buffers[cur].vertices;
-        int vertexIndex = 0;
-
-        gl.glVertexPointer(3, GL.GL_FLOAT, 6 * SIZEOF_FLOAT, v);
-        gl.glNormalPointer(GL.GL_FLOAT, 6 * SIZEOF_FLOAT, buffers[cur].normals);
-
-        for(int jj=STRIP_SIZE; --jj>=0; ) {
-          ysinlo[jj] = sinArray[loY.getIndex()];
-          ycoslo[jj] = cosArray[loY.getIndex()]; loY.incr();
-          ysinhi[jj] = sinArray[hiY.getIndex()];
-          ycoshi[jj] = cosArray[hiY.getIndex()]; hiY.incr();
-        }
-        loY.decr();
-        hiY.decr();
-
-        for(int i = tileSize; --i>=0; ) {
-          float x = xyArray[i];
-          int loXIndex = loX.getIndex();
-          int hiXIndex = hiX.getIndex();
-
-          int jOffset = (STRIP_SIZE-1)*slab;
-          float nx = locoef * -cosArray[loXIndex] + hicoef * -cosArray[hiXIndex];
-
-          // Help the HotSpot Client Compiler by hoisting loop
-          // invariant variables into locals. Note that this may be
-          // good practice for innermost loops anyway since under
-          // the new memory model operations like accidental
-          // synchronization may force any compiler to reload these
-          // fields from memory, destroying their ability to
-          // optimize.
-          float locoef_tmp = locoef;
-          float hicoef_tmp = hicoef;
-          float[] ysinlo_tmp = ysinlo;
-          float[] ysinhi_tmp = ysinhi;
-          float[] ycoslo_tmp = ycoslo;
-          float[] ycoshi_tmp = ycoshi;
-          float[] sinArray_tmp = sinArray;
-          float[] xyArray_tmp = xyArray;
-
-          for(int j = STRIP_SIZE; --j>=0; ) {
-            float y;
-
-            y = xyArray_tmp[j + jOffset];
-
-            float ny;
-
-            v.put(vertexIndex, x);
-            v.put(vertexIndex + 1, y);
-            v.put(vertexIndex + 2, (locoef_tmp * (sinArray_tmp[loXIndex] + ysinlo_tmp[j]) +
-                                    hicoef_tmp * (sinArray_tmp[hiXIndex] + ysinhi_tmp[j])));
-            v.put(vertexIndex + 3, nx);
-            ny = locoef_tmp * -ycoslo_tmp[j] + hicoef_tmp * -ycoshi_tmp[j];
-            v.put(vertexIndex + 4, ny);
-            v.put(vertexIndex + 5, .15f); //.15f * (1.f - sqrt(nx * nx + ny * ny));
-            vertexIndex += 6;
-          }
-          loX.incr();
-          hiX.incr();
-        }
-        loX.reset();
-        hiX.reset();
-
-        for (int i = 0; i < elements.length; i++) {
-          ++numDrawElementsCalls;
-          gl.glDrawElements(primitive, elements[i].length, GL.GL_UNSIGNED_INT, elements[i]);
-          if(getFlag('f')) {
-            gl.glFlush();
-          }
-        }
-
-        gl.glSetFenceNV(buffers[cur].fence, GL.GL_ALL_COMPLETED_NV);
-      }
-
-      gl.glPopMatrix();
-
-      gl.glFinishFenceNV(buffers[cur].fence);
-
-      if (getFlag('r')) {
-        if (!firstProfiledFrame) {
-          if (++profiledFrameCount == 30) {
-            long endTimeMillis = System.currentTimeMillis();
-            double secs = (endTimeMillis - startTimeMillis) / 1000.0;
-            double fps  = 30.0 / secs;
-            double ppf  = tileSize * tileSize * 2;
-            double mpps = ppf * fps / 1000000.0;
-            System.err.println("fps: " + fps + " polys/frame: " + ppf + " million polys/sec: " + mpps +
-                               " DrawElements calls/frame: " + (numDrawElementsCalls / 30));
-            profiledFrameCount = 0;
-            numDrawElementsCalls = 0;
-            startTimeMillis = System.currentTimeMillis();
-          }
-        } else {
-          startTimeMillis = System.currentTimeMillis();
-          firstProfiledFrame = false;
-
-        }
-      }
-    }
-
-    public void reshape(GLDrawable drawable, int x, int y, int width, int height) {}
-
-    // Unused routines
-    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
-
-    private void runExit() {
-      quit = true;
-      // Note: calling System.exit() synchronously inside the draw,
-      // reshape or init callbacks can lead to deadlocks on certain
-      // platforms (in particular, X11) because the JAWT's locking
-      // routines cause a global AWT lock to be grabbed. Run the
-      // exit routine in another thread and cause this one to
-      // terminate by throwing an exception out of it.
-      new Thread(new Runnable() {
-          public void run() {
-            System.exit(0);
-          }
-        }).start();
-    }
-  } // end class VARListener
-
-  private void allocateBigArray(GL gl, boolean tryAgain) {
-    float priority = .5f;
-
-    bigArraySystem = setupBuffer(ByteBuffer.allocateDirect(bufferSize));
-
-    float megabytes = (bufferSize / 1000000.f);
-    try {
-      bigArrayVar = setupBuffer(gl.glAllocateMemoryNV(bufferSize, 0, 0, priority));
-    }
-    catch (OutOfMemoryError e1) {
-      // Try a higher priority
-      try {
-        bigArrayVar = setupBuffer(gl.glAllocateMemoryNV(bufferSize, 0, 0, 1.f));
-      }
-      catch (OutOfMemoryError e2) {
-        if (!tryAgain) {
-          throw new RuntimeException("Unable to allocate " + megabytes +
-                                     " megabytes of fast memory. Giving up.");
-        }
-
-        System.err.println("Unable to allocate " + megabytes +
-                           " megabytes of fast memory. Trying less.");
-        bufferSize /= 2;
-        numBuffers /= 2;
-        allocateBigArray(gl, false);
-        return;
-      }
-    }
-
-    System.err.println("Allocated " + megabytes + " megabytes of fast memory");
-  }
-
-  private FloatBuffer setupBuffer(ByteBuffer buf) {
-    buf.order(ByteOrder.nativeOrder());
-    return buf.asFloatBuffer();
-  }
-
-  private FloatBuffer sliceBuffer(FloatBuffer array,
-                                  int sliceStartIndex, int sliceLength) {
-    array.position(sliceStartIndex);
-    FloatBuffer ret = array.slice();
-    array.position(0);
-    ret.limit(sliceLength);
-    return ret;
-  }
-
-  private void computeElements() {
-    xyArray = new float[tileSize];
-    for (int i = 0; i < tileSize; i++) {
-      xyArray[i] = i / (tileSize - 1.0f) - 0.5f;
-    }
-
-    elements = new int[tileSize - 1][];
-    for (int i = 0; i < tileSize - 1; i++) {
-      elements[i] = new int[2 * STRIP_SIZE];
-      for (int j = 0; j < 2 * STRIP_SIZE; j += 2) {
-        elements[i][j]   =  i      * STRIP_SIZE + (j / 2);
-        elements[i][j+1] = (i + 1) * STRIP_SIZE + (j / 2);
-      }
-    }
-  }
-}