[VBO] Afficher des géométries différentes

**GLDavid** · 23/06/2009, 09h57

Bonjour

Voilà je cherche quelques conseils sur une question que je me pose concernant les VBO.
Dans mon application, je dessine sans peine à l'aide de cette technique des carrés (GL_QUADS). Seulement, je veux maintenant lier ces carrés à l'aide de lignes (GL_LINES). Faut-il alors créer plusieurs buffers à l'aide de glGenBufer ? Ou y a t'il un moyen plus élégants ?

Merci d'avance.

@++

**GLDavid** · 23/06/2009, 10h44

Ok, je pense avoir trouvé une solution mais je ne pense pas qu'elle soit optimale:
1) Construire tous les buffers de mes carrés. Les mettre dans le tampon de noms.
2) Dessiner mes carrés avec glMultiDrawArrays
3) Vider mon tampon avec glDeleteBuffer
4) Construire tous les buffers de mes liens. Les mettre dans le tampon de noms.
5) Dessiner mes liens avec glMultiDrawArrays
6) Vider mon tampon avec glDeleteBuffer
7) goto 1

Bon ça marche mais comme je le fais remarquer, ce n'est certainement pas la méthode la plus élégante. En effet, mon nombre de carrés et de liens pourra être très important et je crains des soucis en terme de rapidité d'affichage. Je suis donc ouvert à toutes suggestion

@++

**plegat** · 23/06/2009, 13h07

Salut

Pourquoi ne pas dessiner tes quads avec des GL_LINES?

**GLDavid** · 23/06/2009, 18h15

Salut Plegat

Et bien, tout simplement parce que je veux des carrés "pleins": mes carrés doivent contenir une couleur ou une texture.

@++

**TanEk** · 23/06/2009, 22h52

Tu peux aussi afficher tes carres en mode filaire comme ca ca te fera des lignes ? Et tu n'auras plus qu'un buffer d'indices (la geometrie c'est ton buffer de points, la topologie c'est ton buffer d'indices...).

**GLDavid** · 24/06/2009, 10h25

Envoyé par TanEk

Tu peux aussi afficher tes carres en mode filaire comme ca ca te fera des lignes ? Et tu n'auras plus qu'un buffer d'indices (la geometrie c'est ton buffer de points, la topologie c'est ton buffer d'indices...).

Bonjour

Mais dans ce cas, comment faire pour appliquer une couleur ?

@++

**TanEk** · 24/06/2009, 19h27

Comment ca ? Le fait de rendre en filaire ne change rien pour OpenGL a sa maniere de faire le rendu. Si tu textures ton mesh et que tu lui appliques une lumiere, ce sera pareil en filaire seulement il n'y aura que des aretes...

**GLDavid** · 24/06/2009, 21h41

Salut TanEk

Hmmm, j'admets ne pas trop suivre . Je vais tâcher de trouver un exemple par rapport à ton propos. Je suis encore débutant en VBO et je dispose d'encore trop de références sur le rendu immédiat et de méthodes classiques.
Cela étant, je te remercie car c'est une optimisation à suivre.
Je suis enfin satisfait de voir que personne ne trouve à redire sur le "pseudocode"

Merci à vous tous

@++

**GLDavid** · 13/07/2009, 10h38

Bonjour

Chose promise, chose dûe. Je poste ici un petit code de démo sur commet afficher plusieurs géométries différentes. Le code fonctionne pour Java 5-6 avec JOGL 1.1.1:

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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import com.sun.opengl.util.Animator;
import com.sun.opengl.util.BufferUtil;
import java.awt.BorderLayout;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author dbourgais
 */
public class MultiObjectVBO {
 
    public static void main(String[]args){
        GLCanvas canvas = new GLCanvas();
        MultiOVBOTest demo = new MultiOVBOTest();
        canvas.addGLEventListener(demo);
 
        final Animator animator = new Animator(canvas);
        animator.start();
 
        JFrame frame = new JFrame("MultiObjectVBO");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        canvas.setSize(400, 400);
        frame.add(canvas, BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
        canvas.requestFocus();
    }
 
}
 
class MultiOVBOTest implements GLEventListener, MouseWheelListener {
 
    private float zoom = -20;
    private List<Square>squares;
    private List<Line>lines;
    private float[]centers = {
        -5, 5, 0,
        5, 5, 0,
        5, -5, 0,
        -5, -5, 0
    };
    private float[]dots = {
        -5, 5, 0, 5, -5, 0,
        5, 5, 0, -5, -5, 0
    };
    private IntBuffer bufferName;
    private FloatBuffer positionData;
    private FloatBuffer colorData;
    private IntBuffer starts;
    private IntBuffer counts;
    private FloatBuffer positionLineData;
    private FloatBuffer colorLineData;
    private IntBuffer startsLine;
    private IntBuffer countsLine;
    private final int LIMIT = 4;
 
    public MultiOVBOTest(){
        squares = new ArrayList<Square>();
        lines = new ArrayList<Line>();
        for(int i=0; i<centers.length; i+=3){
            squares.add(new Square(centers[i], centers[i+1], centers[i+2]));
        }
        for(int i=0; i<dots.length; i+=6){
            lines.add(new Line(dots[i], dots[i+1], dots[i+2], dots[i+3], dots[i+4], dots[i+5]));
        }
        this.bufferName = BufferUtil.newIntBuffer(LIMIT);
    }
 
    public void init(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
 
        drawable.addMouseWheelListener(this);
 
        gl.glShadeModel(gl.GL_SMOOTH);
        gl.glEnable(gl.GL_DEPTH_TEST);
 
        gl.glGenBuffers(LIMIT, bufferName);
 
        int constant = squares.size() * BufferUtil.SIZEOF_FLOAT;
        this.positionData = BufferUtil.newFloatBuffer(12 * constant);
        this.colorData = BufferUtil.newFloatBuffer(4 * constant);
        this.starts = BufferUtil.newIntBuffer(squares.size());
        this.counts = BufferUtil.newIntBuffer(squares.size());
 
        constant = lines.size() * BufferUtil.SIZEOF_FLOAT;
        this.positionLineData = BufferUtil.newFloatBuffer(6 * constant);
        this.colorLineData = BufferUtil.newFloatBuffer(4 * constant);
        this.startsLine = BufferUtil.newIntBuffer(lines.size());
        this.countsLine = BufferUtil.newIntBuffer(lines.size());
 
        pushNodesDataBuffers(gl);
        pushLinesDataBuffers(gl);
    }
 
    private void pushNodesDataBuffers(final GL gl){
        Iterator<Square> it = this.squares.iterator();
        int i = 0;
        int j = 4;
        while (it.hasNext()) {
            Square square = it.next();
            this.positionData.put(square.getBufferVertices());
            this.colorData.put(square.getBufferColor());
            starts.put(i);
            counts.put(j);
            i = i + square.getBufferIndicesSize();
            j = j + square.getBufferIndicesSize();
        }
        this.positionData.rewind();
        this.colorData.rewind();
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER, 
                this.squares.get(0).sizeofBufferVertices() *
                    this.squares.size() * BufferUtil.SIZEOF_FLOAT,
                positionData,
                gl.GL_STATIC_DRAW);
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.squares.get(0).sizeofBufferColor() *
                    this.squares.size() * BufferUtil.SIZEOF_FLOAT,
                colorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.starts.rewind();
        this.counts.rewind();
    }
 
    private void pushLinesDataBuffers(final GL gl){
        Iterator<Line> it = this.lines.iterator();
        int i = 0;
        int j = 2;
        while (it.hasNext()) {
            Line line = it.next();
            this.positionLineData.put(line.getBufferVertices());
            this.colorLineData.put(line.getBufferColor());
            startsLine.put(i);
            countsLine.put(j);
            i = i + line.getBufferIndicesSize();
            j = j + line.getBufferIndicesSize();
        }
        this.positionLineData.rewind();
        this.colorLineData.rewind();
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.lines.get(0).sizeofBufferVertices() *
                    this.lines.size() * BufferUtil.SIZEOF_FLOAT,
                positionLineData,
                gl.GL_STATIC_DRAW);
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(3));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.lines.get(0).sizeofBufferColor() *
                    this.lines.size() * BufferUtil.SIZEOF_FLOAT,
                colorLineData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.startsLine.rewind();
        this.countsLine.rewind();
    }
 
    public void display(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glClearColor(1, 1, 1, 0);
 
        gl.glMatrixMode(gl.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glTranslatef(0, 0, zoom);
 
 
        gl.glLineWidth(2f);
 
        gl.glEnableClientState(GL.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL.GL_COLOR_ARRAY);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        gl.glMultiDrawArrays(gl.GL_QUADS, starts, counts, this.squares.size());
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(3));
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        gl.glMultiDrawArrays(gl.GL_LINES, startsLine, countsLine, this.lines.size());
 
        gl.glFlush();
    }
 
    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
        final int maxZ = 1000;
        GL gl = drawable.getGL();
        gl.glViewport(0, 0, width, height);
        /*For the camera*/
        gl.glMatrixMode(gl.GL_PROJECTION);
        gl.glLoadIdentity();
        //Change this by glOrtho
        new GLU().gluPerspective(45., (float) width / height, 1., maxZ);
        /*Model & view*/
        gl.glMatrixMode(gl.GL_MODELVIEW);
        gl.glLoadIdentity();
    }
 
    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
    }
 
    public void mouseWheelMoved(MouseWheelEvent e) {
        if (e.getWheelRotation() > 0) {
            zoom += 0.5;
        } else {
            zoom -= 0.5;
        }
    }
 
}
 
class Square{
 
    private final float side = 0.5f;
    private float x, y, z;
    final private byte[]indices = {0, 1, 2, 3};
    float[]coords;
    private int sizeOfBufferVertices;
    private FloatBuffer nodeVertices;
    private int sizeOfBufferColor;
    private FloatBuffer nodeColor;
    private ByteBuffer nodeIndices;
 
    public Square(float x, float y, float z){
        this.x = x;
        this.y = y;
        this.z = z;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int getBufferIndicesSize(){
        return this.indices.length;
    }
 
    private void setCoordinates(){
        coords = new float[12];
        coords[0] = x-side;
        coords[1] = y+side;
        coords[2] = z;
        coords[3] = x+side;
        coords[4] = y+side;
        coords[5] = z;
        coords[6] = x+side;
        coords[7] = y-side;
        coords[8] = z;
        coords[9] = x-side;
        coords[10] = y-side;
        coords[11] = z;
    }
 
    private void setupNodeVerticesBuffer(){
        int bufferVerticesSize = coords.length;
        this.sizeOfBufferVertices = bufferVerticesSize * BufferUtil.SIZEOF_FLOAT;
        nodeVertices = BufferUtil.newFloatBuffer(bufferVerticesSize);
        nodeVertices.put(coords);
        nodeVertices.rewind();
    }
 
    private void setupNodeColorBuffer(){
        float[]colorComponds = {1, 0, 0, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferColor = bufferColorSize * BufferUtil.SIZEOF_FLOAT;
        float[]allColorComponds = new float[bufferColorSize];
        int j=0;
        for(int i=0; i<allColorComponds.length; i++){
            allColorComponds[i] = colorComponds[j++];
            if(j==colorComponds.length){
                j=0;
            }
        }
        nodeColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeColor.put(allColorComponds);
        nodeColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}
 
class Line{
 
    private float x0, y0, z0;
    private float x1, y1, z1;
    final private byte[]indices = {0, 1};
    float[]coords;
    private int sizeOfBufferVertices;
    private FloatBuffer nodeVertices;
    private int sizeOfBufferColor;
    private FloatBuffer nodeColor;
    private ByteBuffer nodeIndices;
 
    public Line(float x0, float y0, float z0, float x1, float y1, float z1){
        this.x0 = x0;
        this.y0 = y0;
        this.z0 = z0;
        this.x1 = x1;
        this.y1 = y1;
        this.z1 = z1;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int getBufferIndicesSize(){
        return this.indices.length;
    }
 
    private void setCoordinates(){
        coords = new float[6];
        coords[0] = x0;
        coords[1] = y0;
        coords[2] = z0;
        coords[3] = x1;
        coords[4] = y1;
        coords[5] = z1;
    }
 
    private void setupNodeVerticesBuffer(){
        int bufferVerticesSize = coords.length;
        this.sizeOfBufferVertices = bufferVerticesSize * BufferUtil.SIZEOF_FLOAT;
        nodeVertices = BufferUtil.newFloatBuffer(bufferVerticesSize);
        nodeVertices.put(coords);
        nodeVertices.rewind();
    }
 
    private void setupNodeColorBuffer(){
        float[]colorComponds = {0, 0, 1, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferColor = bufferColorSize * BufferUtil.SIZEOF_FLOAT;
        float[]allColorComponds = new float[bufferColorSize];
        int j=0;
        for(int i=0; i<allColorComponds.length; i++){
            allColorComponds[i] = colorComponds[j++];
            if(j==colorComponds.length){
                j=0;
            }
        }
        nodeColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeColor.put(allColorComponds);
        nodeColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}

Si les admins veulent le mettre sur la partie "sources", pas de soucis

@++

**GLDavid** · 13/07/2009, 17h15

Hello

Suite à une erreur repérée voici le même code sans l'erreur (provoquant du parasitage sur de hauts nombre de géomtries):

Code :

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import com.sun.opengl.util.Animator;
import com.sun.opengl.util.BufferUtil;
import java.awt.BorderLayout;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author dbourgais
 */
public class MultiObjectVBO {
 
    public static void main(String[]args){
        GLCanvas canvas = new GLCanvas();
        MultiOVBOTest demo = new MultiOVBOTest();
        canvas.addGLEventListener(demo);
 
        final Animator animator = new Animator(canvas);
        animator.start();
 
        JFrame frame = new JFrame("MultiObjectVBO");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        canvas.setSize(400, 400);
        frame.add(canvas, BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
        canvas.requestFocus();
    }
 
}
 
class MultiOVBOTest implements GLEventListener, MouseWheelListener {
 
    private float zoom = -20;
    private List<Square>squares;
    private List<Line>lines;
    private float[]centers = {
        -5, 5, 0,
        5, 5, 0,
        5, -5, 0,
        -5, -5, 0
    };
    private float[]dots = {
        -5, 5, 0, 5, -5, 0,
        5, 5, 0, -5, -5, 0
    };
    private IntBuffer bufferName;
    private FloatBuffer positionData;
    private FloatBuffer colorData;
    private IntBuffer starts;
    private IntBuffer counts;
    private FloatBuffer positionLineData;
    private FloatBuffer colorLineData;
    private IntBuffer startsLine;
    private IntBuffer countsLine;
    private final int LIMIT = 4;
 
    public MultiOVBOTest(){
        squares = new ArrayList<Square>();
        lines = new ArrayList<Line>();
        for(int i=0; i<centers.length; i+=3){
            squares.add(new Square(centers[i], centers[i+1], centers[i+2]));
        }
        for(int i=0; i<dots.length; i+=6){
            lines.add(new Line(dots[i], dots[i+1], dots[i+2], dots[i+3], dots[i+4], dots[i+5]));
        }
        this.bufferName = BufferUtil.newIntBuffer(LIMIT);
    }
 
    public void init(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
 
        drawable.addMouseWheelListener(this);
 
        gl.glShadeModel(gl.GL_SMOOTH);
        gl.glEnable(gl.GL_DEPTH_TEST);
 
        gl.glGenBuffers(LIMIT, bufferName);
 
        int constant = squares.size() * BufferUtil.SIZEOF_FLOAT;
        this.positionData = BufferUtil.newFloatBuffer(12 * constant);
        this.colorData = BufferUtil.newFloatBuffer(4 * constant);
        this.starts = BufferUtil.newIntBuffer(squares.size());
        this.counts = BufferUtil.newIntBuffer(squares.size());
 
        constant = lines.size() * BufferUtil.SIZEOF_FLOAT;
        this.positionLineData = BufferUtil.newFloatBuffer(6 * constant);
        this.colorLineData = BufferUtil.newFloatBuffer(4 * constant);
        this.startsLine = BufferUtil.newIntBuffer(lines.size());
        this.countsLine = BufferUtil.newIntBuffer(lines.size());
 
        pushNodesDataBuffers(gl);
        pushLinesDataBuffers(gl);
    }
 
    private void pushNodesDataBuffers(final GL gl){
        Iterator<Square> it = this.squares.iterator();
        int i = 0;
        int j = 4;
        while (it.hasNext()) {
            Square square = it.next();
            this.positionData.put(square.getBufferVertices());
            this.colorData.put(square.getBufferColor());
            starts.put(i);
            counts.put(j);
            i = i + square.getBufferIndicesSize();
            j = square.getBufferIndicesSize();
        }
        this.positionData.rewind();
        this.colorData.rewind();
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER, 
                this.squares.get(0).sizeofBufferVertices() *
                    this.squares.size() * BufferUtil.SIZEOF_FLOAT,
                positionData,
                gl.GL_STATIC_DRAW);
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.squares.get(0).sizeofBufferColor() *
                    this.squares.size() * BufferUtil.SIZEOF_FLOAT,
                colorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.starts.rewind();
        this.counts.rewind();
    }
 
    private void pushLinesDataBuffers(final GL gl){
        Iterator<Line> it = this.lines.iterator();
        int i = 0;
        int j = 2;
        while (it.hasNext()) {
            Line line = it.next();
            this.positionLineData.put(line.getBufferVertices());
            this.colorLineData.put(line.getBufferColor());
            startsLine.put(i);
            countsLine.put(j);
            i = i + line.getBufferIndicesSize();
            j = line.getBufferIndicesSize();
        }
        this.positionLineData.rewind();
        this.colorLineData.rewind();
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.lines.get(0).sizeofBufferVertices() *
                    this.lines.size() * BufferUtil.SIZEOF_FLOAT,
                positionLineData,
                gl.GL_STATIC_DRAW);
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(3));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.lines.get(0).sizeofBufferColor() *
                    this.lines.size() * BufferUtil.SIZEOF_FLOAT,
                colorLineData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.startsLine.rewind();
        this.countsLine.rewind();
    }
 
    public void display(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        gl.glClearColor(1, 1, 1, 0);
 
        gl.glMatrixMode(gl.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glTranslatef(0, 0, zoom);
 
 
        gl.glLineWidth(2f);
 
        gl.glEnableClientState(GL.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL.GL_COLOR_ARRAY);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        gl.glMultiDrawArrays(gl.GL_QUADS, starts, counts, this.squares.size());
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(3));
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        gl.glMultiDrawArrays(gl.GL_LINES, startsLine, countsLine, this.lines.size());
 
        gl.glFlush();
    }
 
    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
        final int maxZ = 1000;
        GL gl = drawable.getGL();
        gl.glViewport(0, 0, width, height);
        /*For the camera*/
        gl.glMatrixMode(gl.GL_PROJECTION);
        gl.glLoadIdentity();
        //Change this by glOrtho
        new GLU().gluPerspective(45., (float) width / height, 1., maxZ);
        /*Model & view*/
        gl.glMatrixMode(gl.GL_MODELVIEW);
        gl.glLoadIdentity();
    }
 
    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
    }
 
    public void mouseWheelMoved(MouseWheelEvent e) {
        if (e.getWheelRotation() > 0) {
            zoom += 0.5;
        } else {
            zoom -= 0.5;
        }
    }
 
}
 
class Square{
 
    private final float side = 0.5f;
    private float x, y, z;
    final private byte[]indices = {0, 1, 2, 3};
    float[]coords;
    private int sizeOfBufferVertices;
    private FloatBuffer nodeVertices;
    private int sizeOfBufferColor;
    private FloatBuffer nodeColor;
    private ByteBuffer nodeIndices;
 
    public Square(float x, float y, float z){
        this.x = x;
        this.y = y;
        this.z = z;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int getBufferIndicesSize(){
        return this.indices.length;
    }
 
    private void setCoordinates(){
        coords = new float[12];
        coords[0] = x-side;
        coords[1] = y+side;
        coords[2] = z;
        coords[3] = x+side;
        coords[4] = y+side;
        coords[5] = z;
        coords[6] = x+side;
        coords[7] = y-side;
        coords[8] = z;
        coords[9] = x-side;
        coords[10] = y-side;
        coords[11] = z;
    }
 
    private void setupNodeVerticesBuffer(){
        int bufferVerticesSize = coords.length;
        this.sizeOfBufferVertices = bufferVerticesSize * BufferUtil.SIZEOF_FLOAT;
        nodeVertices = BufferUtil.newFloatBuffer(bufferVerticesSize);
        nodeVertices.put(coords);
        nodeVertices.rewind();
    }
 
    private void setupNodeColorBuffer(){
        float[]colorComponds = {1, 0, 0, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferColor = bufferColorSize * BufferUtil.SIZEOF_FLOAT;
        float[]allColorComponds = new float[bufferColorSize];
        int j=0;
        for(int i=0; i<allColorComponds.length; i++){
            allColorComponds[i] = colorComponds[j++];
            if(j==colorComponds.length){
                j=0;
            }
        }
        nodeColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeColor.put(allColorComponds);
        nodeColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}
 
class Line{
 
    private float x0, y0, z0;
    private float x1, y1, z1;
    final private byte[]indices = {0, 1};
    float[]coords;
    private int sizeOfBufferVertices;
    private FloatBuffer nodeVertices;
    private int sizeOfBufferColor;
    private FloatBuffer nodeColor;
    private ByteBuffer nodeIndices;
 
    public Line(float x0, float y0, float z0, float x1, float y1, float z1){
        this.x0 = x0;
        this.y0 = y0;
        this.z0 = z0;
        this.x1 = x1;
        this.y1 = y1;
        this.z1 = z1;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int getBufferIndicesSize(){
        return this.indices.length;
    }
 
    private void setCoordinates(){
        coords = new float[6];
        coords[0] = x0;
        coords[1] = y0;
        coords[2] = z0;
        coords[3] = x1;
        coords[4] = y1;
        coords[5] = z1;
    }
 
    private void setupNodeVerticesBuffer(){
        int bufferVerticesSize = coords.length;
        this.sizeOfBufferVertices = bufferVerticesSize * BufferUtil.SIZEOF_FLOAT;
        nodeVertices = BufferUtil.newFloatBuffer(bufferVerticesSize);
        nodeVertices.put(coords);
        nodeVertices.rewind();
    }
 
    private void setupNodeColorBuffer(){
        float[]colorComponds = {0, 0, 1, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferColor = bufferColorSize * BufferUtil.SIZEOF_FLOAT;
        float[]allColorComponds = new float[bufferColorSize];
        int j=0;
        for(int i=0; i<allColorComponds.length; i++){
            allColorComponds[i] = colorComponds[j++];
            if(j==colorComponds.length){
                j=0;
            }
        }
        nodeColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeColor.put(allColorComponds);
        nodeColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}

@++

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