[VBO] positionner un VBO avec la souris

**GLDavid** · 09/09/2009, 15h21

Bonjour

Je travaille sur un petit code demo où je cherche à afficher un carré en utilisant les VBO. Ensuite, je veux pouvoir "bouger" ce carré à l'aide de la souris. J'utilise Java6 et jogl 1.1.1. Voici mes codes. Le code MovingSquare.java contient la routine main et tout ce qu'il faut pour afficher et interagir avec la souris:

Code :

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package demo;
 
 
import com.sun.opengl.util.Animator;
import com.sun.opengl.util.BufferUtil;
import demo.geom.Square;
import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
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 GLDavid
 */
public class MovingSquare
        implements GLEventListener, MouseWheelListener, MouseMotionListener,
        MouseListener {
 
    private float zoom = -20;
    private Square square;
    private IntBuffer bufferName;
    private FloatBuffer positionData;
    private FloatBuffer colorData;
    private FloatBuffer falseColorData;
    private IntBuffer starts;
    private IntBuffer counts;
    private final int LIMIT = 3;
    private Point mousePosition;
    private boolean mustCheck;
    private static GLCanvas canvas;
 
    public MovingSquare() {
        this.square = new Square(0, 0, 0);
        this.bufferName = BufferUtil.newIntBuffer(LIMIT);
    }
 
    private void initDataBuffers(final GL gl){
        int i = 0;
        int j = 4;
        this.positionData.put(square.getBufferVertices());
        this.colorData.put(square.getBufferColor());
        this.falseColorData.position(square.sizeofBufferFalseColor());
        starts.put(i);
        counts.put(j);
        i = i + square.getBufferIndicesSize();
        j = square.getBufferIndicesSize();
        this.positionData.rewind();
        this.colorData.rewind();
        this.falseColorData.rewind();
    }
 
    private void pushNodesDataBuffers(final GL gl) {
        initDataBuffers(gl);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.square.sizeofBufferVertices() *
                BufferUtil.SIZEOF_FLOAT,
                positionData,
                gl.GL_STREAM_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.square.sizeofBufferColor() *
                BufferUtil.SIZEOF_FLOAT,
                colorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.square.sizeofBufferFalseColor() *
                BufferUtil.SIZEOF_FLOAT,
                falseColorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.starts.rewind();
        this.counts.rewind();
    }
 
    public void init(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
 
        drawable.addMouseWheelListener(this);
        drawable.addMouseMotionListener(this);
 
        gl.glShadeModel(gl.GL_SMOOTH);
        gl.glEnable(gl.GL_DEPTH_TEST);
 
        gl.glGenBuffers(LIMIT, bufferName);
 
        int constant = BufferUtil.SIZEOF_FLOAT;
        this.positionData = BufferUtil.newFloatBuffer(square.sizeofBufferVertices() * constant);
        this.colorData = BufferUtil.newFloatBuffer(square.sizeofBufferColor() * constant);
        this.falseColorData = BufferUtil.newFloatBuffer(square.sizeofBufferFalseColor() * constant);
        this.starts = BufferUtil.newIntBuffer(1);
        this.counts = BufferUtil.newIntBuffer(1);
 
        pushNodesDataBuffers(gl);
    }
 
    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.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);
        if(!mustCheck){
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
            gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        }
        else{
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
            gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        }
        gl.glMultiDrawArrays(gl.GL_QUADS, starts, counts, 1);
 
        if(mustCheck){
            checkFalseColor(gl);
        }
 
        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;
        }
    }
 
    public void mouseDragged(MouseEvent e) {
        this.mousePosition = e.getPoint();
        mustCheck = true;
    }
 
    private boolean onNode(FloatBuffer fb){
        for(int i=0; i<3; i++){
            if(fb.get(i)!=0){
                return false;
            }
        }
        return true;
    }
 
    private void moveNode(final GL gl) {
        final int constant = BufferUtil.SIZEOF_FLOAT;
        final int size = square.sizeofBufferVertices() * constant;
        this.square.changePosition(mousePosition.x, mousePosition.y, gl);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                size,
                positionData,
                gl.GL_STREAM_DRAW);
        FloatBuffer newPositions = square.getBufferVertices();
        gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, size, newPositions);
    }
 
    private void checkFalseColor(final GL gl){
        int[]viewport = new int[4];
        gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
        gl.glReadBuffer(GL.GL_BACK);
        FloatBuffer fb = BufferUtil.newFloatBuffer(3);
        gl.glPixelStorei (gl.GL_UNPACK_ALIGNMENT, 1);
        gl.glReadPixels(mousePosition.x, mousePosition.y, 1, 1, gl.GL_RGB,
                gl.GL_FLOAT, fb);
        if(onNode(fb)){
            moveNode(gl);
        }
        mustCheck = false;
        canvas.display();
    }
 
    public static void main(String[] args) {
        GLCapabilities glc = new GLCapabilities();
        glc.setDoubleBuffered(true);
 
        canvas = new GLCanvas(glc);
        MovingSquare demo = new MovingSquare();
        canvas.addGLEventListener(demo);
        canvas.setAutoSwapBufferMode(true);
 
        final Animator animator = new Animator(canvas);
        animator.start();
 
        JFrame frame = new JFrame("Moving VBO square");
        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();
    }
 
    public void mouseMoved(MouseEvent arg0) {
    }
 
    public void mouseClicked(MouseEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
 
    public void mousePressed(MouseEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
 
    public void mouseReleased(MouseEvent arg0) {
        canvas.display();
    }
 
    public void mouseEntered(MouseEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
 
    public void mouseExited(MouseEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

Le code Square.java contient toutes les fonctions nécessaires pour dessiner un carré.

Code :

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package demo.geom;
 
import com.sun.opengl.util.BufferUtil;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;
 
/**
 *
 * @author GLDavid
 */
public 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;
    private FloatBuffer nodeFalseColor;
    private int sizeOfBufferFalseColor;
 
    public Square(float x, float y, float z){
        setXY(x, y);
        this.z = z;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeFalseColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    private void setXY(float x, float y){
        this.x = x;
        this.y = y;
    }
 
    private double[] convertIntoGL(final GL gl, double x, double y) {
        GLU glu = new GLU();
        int viewport[] = new int[4];
        double mvmatrix[] = new double[16];
        double projmatrix[] = new double[16];
        double wcoord[] = new double[4];// wx, wy, wz;// returned xyz coords
        gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
        gl.glGetDoublev(GL.GL_MODELVIEW_MATRIX, mvmatrix, 0);
        gl.glGetDoublev(GL.GL_PROJECTION_MATRIX, projmatrix, 0);
        double realy = viewport[3] - (int) y - 1;
        glu.gluUnProject(x, realy, 0.0, mvmatrix, 0, projmatrix, 0, viewport, 0, wcoord, 0);
        return wcoord;
    }
 
    /**
     * Calculates the translation vector in 2D for two given points
     * @param xA X coordinate of the first point
     * @param yA Y coordinate of the first point
     * @param xB X coordinate of the second point
     * @param yB Y coordinate of the second point
     * @return an array of two float which is the translation vector
     */
    private float[] getTranslationVector(
            float xA,
            float yA,
            float xB,
            float yB) {
        float[] vector = new float[2];
        vector[0] = xB - xA;
        vector[1] = yB - yA;
        return vector;
    }
 
    public void changePosition(float x, float y, final GL gl){
        double[]coord = convertIntoGL(gl, x, y);
        float[]vector = getTranslationVector(this.x, this.y, (float)coord[0], (float)coord[1]);
        setXY(vector[0], vector[1]);
        setCoordinates();
        setupNodeVerticesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public FloatBuffer getBufferFalseColor(){
        return this.nodeFalseColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int sizeofBufferFalseColor(){
        return this.sizeOfBufferFalseColor;
    }
 
    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 setupNodeFalseColorBuffer(){
        float[]colorComponds = {0, 0, 0, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferFalseColor = 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;
            }
        }
        nodeFalseColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeFalseColor.put(allColorComponds);
        nodeFalseColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}

Tout compile correctement et à l'exécution, tout s'affiche bien. Le problème est que lorsque je bouge mon carré avec la souris, celui-ci ne bouge qu'infiniment peu !
Quelqu'un saurait-il me conseiller sur ce problème ?

Merci d'avance.

@++

**GLDavid** · 09/09/2009, 16h12

Un petit update. J'avais deux sources potentiels d'erreurs à vérifier:
1) mauvaise gestion de la souris
2) appel à glBufferSubData mal effectué.
Pour vérifier le numéro 2, j'ai modifié mon code comme ce qui suit.
Code MovingSquare.java:

Code :

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package demo;
 
 
import com.sun.opengl.util.Animator;
import com.sun.opengl.util.BufferUtil;
import demo.geom.Square;
import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
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 GLDavid
 */
public class MovingSquare
        implements GLEventListener, MouseWheelListener, MouseMotionListener,
        MouseListener, KeyListener {
 
    private float zoom = -20;
    private Square square;
    private IntBuffer bufferName;
    private FloatBuffer positionData;
    private FloatBuffer colorData;
    private FloatBuffer falseColorData;
    private IntBuffer starts;
    private IntBuffer counts;
    private final int LIMIT = 3;
    private Point mousePosition;
    private boolean mustCheck;
    private static GLCanvas canvas;
    private float x, y, z;
    private boolean keyPressed;
 
    public MovingSquare() {
        this.square = new Square(x, y, z);
        this.bufferName = BufferUtil.newIntBuffer(LIMIT);
    }
 
    private void initDataBuffers(final GL gl){
        int i = 0;
        int j = 4;
        this.positionData.put(square.getBufferVertices());
        this.colorData.put(square.getBufferColor());
        this.falseColorData.position(square.sizeofBufferFalseColor());
        starts.put(i);
        counts.put(j);
        i = i + square.getBufferIndicesSize();
        j = square.getBufferIndicesSize();
        this.positionData.rewind();
        this.colorData.rewind();
        this.falseColorData.rewind();
    }
 
    private void pushNodesDataBuffers(final GL gl) {
        initDataBuffers(gl);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.square.sizeofBufferVertices() *
                BufferUtil.SIZEOF_FLOAT,
                positionData,
                gl.GL_STREAM_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.square.sizeofBufferColor() *
                BufferUtil.SIZEOF_FLOAT,
                colorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                this.square.sizeofBufferFalseColor() *
                BufferUtil.SIZEOF_FLOAT,
                falseColorData,
                gl.GL_STATIC_DRAW);
        gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
 
        this.starts.rewind();
        this.counts.rewind();
    }
 
    public void init(GLAutoDrawable drawable) {
        final GL gl = drawable.getGL();
 
        drawable.addMouseWheelListener(this);
        drawable.addMouseMotionListener(this);
        drawable.addMouseListener(this);
        drawable.addKeyListener(this);
 
        gl.glShadeModel(gl.GL_SMOOTH);
        gl.glEnable(gl.GL_DEPTH_TEST);
 
        gl.glGenBuffers(LIMIT, bufferName);
 
        int constant = BufferUtil.SIZEOF_FLOAT;
        this.positionData = BufferUtil.newFloatBuffer(square.sizeofBufferVertices() * constant);
        this.colorData = BufferUtil.newFloatBuffer(square.sizeofBufferColor() * constant);
        this.falseColorData = BufferUtil.newFloatBuffer(square.sizeofBufferFalseColor() * constant);
        this.starts = BufferUtil.newIntBuffer(1);
        this.counts = BufferUtil.newIntBuffer(1);
 
        pushNodesDataBuffers(gl);
    }
 
    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.glEnableClientState(GL.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL.GL_COLOR_ARRAY);
 
        if(keyPressed){
            moveNodeKeyboard(gl);
        }
 
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glVertexPointer(3, gl.GL_FLOAT, 0, 0);
        if(!mustCheck){
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(1));
            gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        }
        else{
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(2));
            gl.glColorPointer(4, gl.GL_FLOAT, 0, 0);
        }
        gl.glMultiDrawArrays(gl.GL_QUADS, starts, counts, 1);
 
        if(mustCheck){
            checkFalseColor(gl);
        }
 
        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;
        }
    }
 
    public void mouseDragged(MouseEvent e) {
        this.mousePosition = e.getPoint();
        mustCheck = true;
    }
 
    private boolean onNode(FloatBuffer fb){
        for(int i=0; i<3; i++){
            if(fb.get(i)!=0){
                return false;
            }
        }
        return true;
    }
 
    private void moveNode(final GL gl) {
        final int constant = BufferUtil.SIZEOF_FLOAT;
        final int size = square.sizeofBufferVertices() * constant;
        this.square.changePosition(mousePosition.x, mousePosition.y, true, gl);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                size,
                positionData,
                gl.GL_STREAM_DRAW);
        FloatBuffer newPositions = square.getBufferVertices();
        gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, size, newPositions);
    }
 
    private void moveNodeKeyboard(final GL gl){
        final int constant = BufferUtil.SIZEOF_FLOAT;
        final int size = square.sizeofBufferVertices() * constant;
        this.square.changePosition(x, y, false, gl);
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, bufferName.get(0));
        gl.glBufferData(gl.GL_ARRAY_BUFFER,
                size,
                positionData,
                gl.GL_STREAM_DRAW);
        FloatBuffer newPositions = square.getBufferVertices();
        gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, size, newPositions);
    }
 
    private void checkFalseColor(final GL gl){
        int[]viewport = new int[4];
        gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
        gl.glReadBuffer(GL.GL_BACK);
        FloatBuffer fb = BufferUtil.newFloatBuffer(3);
        gl.glPixelStorei (gl.GL_UNPACK_ALIGNMENT, 1);
        gl.glReadPixels(mousePosition.x, mousePosition.y, 1, 1, gl.GL_RGB,
                gl.GL_FLOAT, fb);
        if(onNode(fb)){
            moveNode(gl);
        }
        mustCheck = false;
        canvas.display();
    }
 
    public static void main(String[] args) {
        GLCapabilities glc = new GLCapabilities();
        glc.setDoubleBuffered(true);
 
        canvas = new GLCanvas(glc);
        MovingSquare demo = new MovingSquare();
        canvas.addGLEventListener(demo);
        canvas.setAutoSwapBufferMode(true);
 
        final Animator animator = new Animator(canvas);
        animator.start();
 
        JFrame frame = new JFrame("Moving VBO square");
        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();
    }
 
    public void mouseMoved(MouseEvent arg0) {
    }
 
    public void mouseClicked(MouseEvent arg0) {
    }
 
    public void mousePressed(MouseEvent arg0) {
    }
 
    public void mouseReleased(MouseEvent arg0) {
        canvas.display();
    }
 
    public void mouseEntered(MouseEvent arg0) {
    }
 
    public void mouseExited(MouseEvent arg0) {
    }
 
    public void keyTyped(KeyEvent e) {
    }
 
    public void keyPressed(KeyEvent e) {
        final float length = 0.05f;
        switch(e.getKeyCode()){
            case KeyEvent.VK_DOWN:{
                y-=length;
            }break;
            case KeyEvent.VK_UP:{
                y+=length;
            }break;
            case KeyEvent.VK_LEFT:{
                x-=length;
            }break;
            case KeyEvent.VK_RIGHT:{
                x+=length;
            }break;
        }
        keyPressed = true;
        canvas.display();
    }
 
    public void keyReleased(KeyEvent e) {
        keyPressed = false;
    }
}

Code Square.java:

Code :

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package demo.geom;
 
import com.sun.opengl.util.BufferUtil;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import javax.media.opengl.GL;
import javax.media.opengl.glu.GLU;
 
/**
 *
 * @author GLDavid
 */
public 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;
    private FloatBuffer nodeFalseColor;
    private int sizeOfBufferFalseColor;
 
    public Square(float x, float y, float z){
        setXY(x, y);
        this.z = z;
        setCoordinates();
        setupNodeVerticesBuffer();
        setupNodeColorBuffer();
        setupNodeFalseColorBuffer();
        setupNodeIndicesBuffer();
    }
 
    private void setXY(float x, float y){
        this.x = x;
        this.y = y;
    }
 
    private double[] convertIntoGL(final GL gl, double x, double y) {
        GLU glu = new GLU();
        int viewport[] = new int[4];
        double mvmatrix[] = new double[16];
        double projmatrix[] = new double[16];
        double wcoord[] = new double[4];// wx, wy, wz;// returned xyz coords
        gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
        gl.glGetDoublev(GL.GL_MODELVIEW_MATRIX, mvmatrix, 0);
        gl.glGetDoublev(GL.GL_PROJECTION_MATRIX, projmatrix, 0);
        double realy = viewport[3] - (int) y - 1;
        glu.gluUnProject(x, realy, 0.0, mvmatrix, 0, projmatrix, 0, viewport, 0, wcoord, 0);
        return wcoord;
    }
 
    /**
     * Calculates the translation vector in 2D for two given points
     * @param xA X coordinate of the first point
     * @param yA Y coordinate of the first point
     * @param xB X coordinate of the second point
     * @param yB Y coordinate of the second point
     * @return an array of two float which is the translation vector
     */
    private float[] getTranslationVector(
            float xA,
            float yA,
            float xB,
            float yB) {
        float[] vector = new float[2];
        vector[0] = xB - xA;
        vector[1] = yB - yA;
        return vector;
    }
 
    public void changePosition(float x, float y, boolean convert, final GL gl){
        if(convert){
            double[]coord = convertIntoGL(gl, x, y);
            float[]vector = getTranslationVector(this.x, this.y, (float)coord[0], (float)coord[1]);
            setXY(vector[0], vector[1]);
        }
        else{
            setXY(x, y);
        }
        setCoordinates();
        setupNodeVerticesBuffer();
    }
 
    public FloatBuffer getBufferVertices(){
        return this.nodeVertices;
    }
 
    public int sizeofBufferVertices(){
        return this.sizeOfBufferVertices;
    }
 
    public FloatBuffer getBufferColor(){
        return this.nodeColor;
    }
 
    public FloatBuffer getBufferFalseColor(){
        return this.nodeFalseColor;
    }
 
    public int sizeofBufferColor(){
        return this.sizeOfBufferColor;
    }
 
    public int sizeofBufferFalseColor(){
        return this.sizeOfBufferFalseColor;
    }
 
    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 setupNodeFalseColorBuffer(){
        float[]colorComponds = {0, 0, 0, 0};
        int bufferColorSize = colorComponds.length * this.indices.length;
        this.sizeOfBufferFalseColor = 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;
            }
        }
        nodeFalseColor = BufferUtil.newFloatBuffer(allColorComponds.
                length);
        nodeFalseColor.put(allColorComponds);
        nodeFalseColor.rewind();
    }
 
    private void setupNodeIndicesBuffer(){
        nodeIndices = BufferUtil.newByteBuffer(this.indices.length);
        nodeIndices.put(this.indices);
        nodeIndices.rewind();
    }
 
}

Evidemment, ça fonctionne au clavier. Moralité, j'ai mal fait ma gestion de souris. Je pense proposer un code sous peu fonctionnel aussi bien au clavier qu'à la souris.

@++

**GLDavid** · 09/09/2009, 17h05

Apparemment, il y a une mauvaise gestion de la souris. J'ai toujours ce déplacement microscopique et qui ne dure pas.
Si vous avez des idées, n'hésitez pas

@++

Invité · 14/09/2009, 15h43

Es-tu encore bloqué? Je vais jeter un coup d'oeil à ton code source tout de suite.

Edit.: j'ai un doute sur ta méthode convertIntoGL.

**GLDavid** · 14/09/2009, 15h45

Salut

Hélas, je le suis toujours

Mon code n'a que peu bougé donc, pas de souci pour que tu travailles dessus.
En tout cas, merci de ton aide, j'apprécie beaucoup.
Bon courage.

@++

Invité · 14/09/2009, 15h51

Les paramètres passés à gluUnproject semble corrects. Je continue de chercher. Sinon, tu peux essayer de voir comment c'est implémenté dans certains moteurs 3D écrits en Java (JMonkeyEngine 2.0, Ardor3D, Xith3D, 3dzzd, ...).

[VBO] positionner un VBO avec la souris

OpenGL

Vue hybride

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