cube.java

j2me手机应用开发环境下的图形图像例子程序

/*
 *
 * Copyright © 2007 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */
package com.sun.jsr239.wtksamples.cube;

import java.nio.*;

import javax.microedition.khronos.egl.*;
import javax.microedition.khronos.opengles.*;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.midlet.MIDlet;


class CubeCanvas extends GameCanvas implements Runnable {
    private static final byte[] s_cubeVertices =
        {
            -10, 10, 10, 10, -10, 10, 10, 10, 10, -10, -10, 10,
            
            -10, 10, -10, 10, -10, -10, 10, 10, -10, -10, -10, -10,
            
            -10, -10, 10, 10, -10, -10, 10, -10, 10, -10, -10, -10,
            
            -10, 10, 10, 10, 10, -10, 10, 10, 10, -10, 10, -10,
            
            10, -10, 10, 10, 10, -10, 10, 10, 10, 10, -10, -10,
            
            -10, -10, 10, -10, 10, -10, -10, 10, 10, -10, -10, -10
        };
    private static final byte[] s_cubeColors =
        {
            (byte)40, (byte)80, (byte)160, (byte)255, (byte)40, (byte)80, (byte)160, (byte)255,
            (byte)40, (byte)80, (byte)160, (byte)255, (byte)40, (byte)80, (byte)160, (byte)255,
            
            (byte)40, (byte)80, (byte)160, (byte)255, (byte)40, (byte)80, (byte)160, (byte)255,
            (byte)40, (byte)80, (byte)160, (byte)255, (byte)40, (byte)80, (byte)160, (byte)255,
            
            (byte)128, (byte)128, (byte)128, (byte)255, (byte)128, (byte)128, (byte)128, (byte)255,
            (byte)128, (byte)128, (byte)128, (byte)255, (byte)128, (byte)128, (byte)128, (byte)255,
            
            (byte)128, (byte)128, (byte)128, (byte)255, (byte)128, (byte)128, (byte)128, (byte)255,
            (byte)128, (byte)128, (byte)128, (byte)255, (byte)128, (byte)128, (byte)128, (byte)255,
            
            (byte)255, (byte)110, (byte)10, (byte)255, (byte)255, (byte)110, (byte)10, (byte)255,
            (byte)255, (byte)110, (byte)10, (byte)255, (byte)255, (byte)110, (byte)10, (byte)255,
            
            (byte)255, (byte)70, (byte)60, (byte)255, (byte)255, (byte)70, (byte)60, (byte)255,
            (byte)255, (byte)70, (byte)60, (byte)255, (byte)255, (byte)70, (byte)60, (byte)255
        };
    private static final byte[] s_cubeIndices =
        {
            0, 3, 1, 2, 0, 1, /* front  */
            6, 5, 4, 5, 7, 4, /* back   */
            8, 11, 9, 10, 8, 9, /* top    */
            15, 12, 13, 12, 14, 13, /* bottom */
            16, 19, 17, 18, 16, 17, /* right  */
            23, 20, 21, 20, 22, 21 /* left   */
        };
    private static final byte[] s_cubeNormals =
        {
            0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0, 127,
            
            0, 0, -128, 0, 0, -128, 0, 0, -128, 0, 0, -128,
            
            0, -128, 0, 0, -128, 0, 0, -128, 0, 0, -128, 0,
            
            0, 127, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0,
            
            127, 0, 0, 127, 0, 0, 127, 0, 0, 127, 0, 0,
            
            -128, 0, 0, -128, 0, 0, -128, 0, 0, -128, 0, 0
        };
    boolean initialized = false;
    int frame = 0;
    float time = 0.0f;
    Graphics g;
    int width;
    int height;
    Cube cube;
    EGL10 egl;
    GL10 gl;
    EGLConfig eglConfig;
    EGLDisplay eglDisplay;
    EGLSurface eglWindowSurface;
    EGLContext eglContext;
    ByteBuffer cubeVertices;
    ByteBuffer cubeColors;
    ByteBuffer cubeNormals;
    ByteBuffer cubeIndices;

    public CubeCanvas(Cube cube) {
        super(true);
        this.cube = cube;
        this.g = this.getGraphics();

        this.width = getWidth();
        this.height = getHeight();
    }

    private int getProperty(String propName, int def) {
        String s = cube.getAppProperty(propName);
        int val = (s == null) ? def : Integer.parseInt(s);

        return val;
    }

    public void init() {
        this.egl = (EGL10)EGLContext.getEGL();

        this.eglDisplay = egl.eglGetDisplay(egl.EGL_DEFAULT_DISPLAY);

        int[] major_minor = new int[2];
        egl.eglInitialize(eglDisplay, major_minor);

        int[] num_config = new int[1];

        egl.eglGetConfigs(eglDisplay, null, 0, num_config);

        int redSize = getProperty("jsr239.redSize", 8);
        int greenSize = getProperty("jsr239.greenSize", 8);
        int blueSize = getProperty("jsr239.blueSize", 8);
        int alphaSize = getProperty("jsr239.alphaSize", 0);
        int depthSize = getProperty("jsr239.depthSize", 32);
        int stencilSize = getProperty("jsr239.stencilSize", EGL10.EGL_DONT_CARE);

        int[] s_configAttribs =
            {
                EGL10.EGL_RED_SIZE, redSize, EGL10.EGL_GREEN_SIZE, greenSize, EGL10.EGL_BLUE_SIZE,
                blueSize, EGL10.EGL_ALPHA_SIZE, alphaSize, EGL10.EGL_DEPTH_SIZE, depthSize,
                EGL10.EGL_STENCIL_SIZE, stencilSize, EGL10.EGL_NONE
            };

        EGLConfig[] eglConfigs = new EGLConfig[num_config[0]];
        egl.eglChooseConfig(eglDisplay, s_configAttribs, eglConfigs, eglConfigs.length, num_config);
        this.eglConfig = eglConfigs[0];

        this.eglContext = egl.eglCreateContext(eglDisplay, eglConfig, EGL10.EGL_NO_CONTEXT, null);

        this.gl = (GL10)eglContext.getGL();

        this.eglWindowSurface = egl.eglCreateWindowSurface(eglDisplay, eglConfig, g, null);

        // Initialize data Buffers
        this.cubeVertices = ByteBuffer.allocateDirect(s_cubeVertices.length);
        cubeVertices.put(s_cubeVertices);
        cubeVertices.rewind();

        this.cubeColors = ByteBuffer.allocateDirect(s_cubeColors.length);
        cubeColors.put(s_cubeColors);
        cubeColors.rewind();

        this.cubeNormals = ByteBuffer.allocateDirect(s_cubeNormals.length);
        cubeNormals.put(s_cubeNormals);
        cubeNormals.rewind();

        this.cubeIndices = ByteBuffer.allocateDirect(s_cubeIndices.length);
        cubeIndices.put(s_cubeIndices);
        cubeIndices.rewind();

        this.initialized = true;
    }

    private void perspective(float fovy, float aspect, float zNear, float zFar) {
        float xmin;
        float xmax;
        float ymin;
        float ymax;

        ymax = zNear * (float)Math.tan((fovy * Math.PI) / 360.0);
        ymin = -ymax;
        xmin = ymin * aspect;
        xmax = ymax * aspect;

        gl.glFrustumf(xmin, xmax, ymin, ymax, zNear, zFar);
    }

    private void updateState(int width, int height) {
        float[] light_position = { -50.f, 50.f, 50.f, 0.f };
        float[] light_ambient = { 0.125f, 0.125f, 0.125f, 1.f };
        float[] light_diffuse = { 1.0f, 1.0f, 1.0f, 1.f };
        float[] material_spec = { 1.0f, 1.0f, 1.0f, 0.f };
        float[] zero_vec4 = { 0.0f, 0.0f, 0.0f, 0.f };

        float aspect = (height != 0) ? ((float)width / (float)height) : 1.0f;

        gl.glViewport(0, 0, width, height);
        gl.glScissor(0, 0, width, height);

        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();

        gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, light_position, 0);
        gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, light_ambient, 0);
        gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, light_diffuse, 0);
        gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_SPECULAR, zero_vec4, 0);
        gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_SPECULAR, material_spec, 0);

        gl.glEnable(GL10.GL_NORMALIZE);
        gl.glEnable(GL10.GL_LIGHTING);
        gl.glEnable(GL10.GL_LIGHT0);
        gl.glEnable(GL10.GL_COLOR_MATERIAL);
        gl.glEnable(GL10.GL_CULL_FACE);

        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);

        gl.glShadeModel(GL10.GL_SMOOTH);
        gl.glDisable(GL10.GL_DITHER);

        // Clear background to blue
        gl.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);

        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL10.GL_NORMAL_ARRAY);
        gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

        gl.glMatrixMode(GL10.GL_PROJECTION);
        gl.glLoadIdentity();

        perspective(90.f, aspect, 0.1f, 100.f);

        gl.glFinish();
    }

    private void drawScene() {
        // Make the context current on this thread
        egl.eglMakeCurrent(eglDisplay, eglWindowSurface, eglWindowSurface, eglContext);

        // Perform setup and clear background using GL
        egl.eglWaitNative(EGL10.EGL_CORE_NATIVE_ENGINE, g);

        updateState(width, height);
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
        gl.glFinish();

        // Wait for GL to complete
        egl.eglWaitGL();

        // Draw a green square using MIDP
        g.setColor(0, 255, 0);
        g.fillRect(20, 20, width - 40, height - 40);

        // Draw the scene using GL
        egl.eglWaitNative(EGL10.EGL_CORE_NATIVE_ENGINE, g);

        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();

        gl.glTranslatef(0.f, 0.f, -30.f);
        gl.glRotatef((float)(time * 29.77f), 1.0f, 2.0f, 0.0f);
        gl.glRotatef((float)(time * 22.311f), -0.1f, 0.0f, -5.0f);

        gl.glVertexPointer(3, GL10.GL_BYTE, 0, cubeVertices);
        gl.glColorPointer(4, GL10.GL_UNSIGNED_BYTE, 0, cubeColors);
        gl.glNormalPointer(GL10.GL_BYTE, 0, cubeNormals);

        gl.glDrawElements(GL10.GL_TRIANGLES, 6 * 6, GL10.GL_UNSIGNED_BYTE, cubeIndices);
        gl.glFinish();

        time += 0.1f;

        egl.eglWaitGL();

        // Release the context
        egl.eglMakeCurrent(eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE,
            EGL10.EGL_NO_CONTEXT);

        // Draw a red square using MIDP
        g.setColor(255, 0, 0);
        g.fillRect((width / 2) - 25, (height / 2) - 25, 50, 50);
    }

    public void shutdown() {
        egl.eglMakeCurrent(eglDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE,
            EGL10.EGL_NO_CONTEXT);
        egl.eglDestroyContext(eglDisplay, eglContext);
        egl.eglDestroySurface(eglDisplay, eglWindowSurface);
        egl.eglTerminate(eglDisplay);
    }

    public void run() {
        if (!initialized) {
            init();
        }

        try {
            while (!cube.isFinished()) {
                if (!cube.paused) {
                    Thread.sleep(2);
                    drawScene();
                    flushGraphics();
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        shutdown();
    }
}


public class Cube extends MIDlet implements CommandListener {
    private final Command exitCommand = new Command("Exit", Command.EXIT, 1);
    Display display;
    CubeCanvas canvas;
    boolean started = false;
    boolean paused = false;
    boolean finished = false;
    Thread drawThread;

    public Cube() {
        this.display = Display.getDisplay(this);
        this.canvas = new CubeCanvas(this);
        this.canvas.setCommandListener(this);
        this.canvas.addCommand(exitCommand);
    }

    public void startApp() {
        if (!started) {
            started = true;
            display.setCurrent(canvas);
            drawThread = new Thread(canvas);
            drawThread.start();
        }

        paused = finished = false;
    }

    public void pauseApp() {
        paused = true;
    }

    public void destroyApp(boolean unconditional) {
        // Wait for draw thread to die
        setFinished();

        try {
            drawThread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void paint(Graphics g) {
    }

    public void commandAction(Command cmd, Displayable disp) {
        if (cmd == exitCommand) {
            destroyApp(false);
            notifyDestroyed();
        }
    }

    public synchronized boolean isFinished() {
        return finished;
    }

    public synchronized void setFinished() {
        finished = true;
    }
}