lwjglswtcanvas.java

java 3d game jme 工程开发源代码

/*
 * Copyright (c) 2003-2009 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jmex.swt.lwjgl;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.opengl.GLCanvas;
import org.eclipse.swt.opengl.GLData;
import org.eclipse.swt.widgets.Composite;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.ARBMultisample;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;

import com.jme.input.InputSystem;
import com.jme.system.DisplaySystem;
import com.jme.system.canvas.JMECanvas;
import com.jme.system.canvas.JMECanvasImplementor;
import com.jme.system.lwjgl.LWJGLDisplaySystem;
import com.jme.util.GameTaskQueue;
import com.jme.util.GameTaskQueueManager;

/**
 * <code>LWJGLCanvas</code>
 * 
 * @author Joshua Slack
 */
public class LWJGLSWTCanvas extends GLCanvas implements JMECanvas {

    private static final Logger logger = Logger.getLogger(LWJGLSWTCanvas.class
            .getName());

    private static final long serialVersionUID = 1L;

    private JMECanvasImplementor impl;

    private boolean updateInput = false;

    private double syncNS = 0f;

    private int syncRate = 0;

    private boolean inited = false;

    private Runnable renderRunner;

    private long lastRender = 0;

    private boolean shouldAutoKillContext = true;
    private boolean glInitialized = false;
    private boolean drawWhenDirty = false;
    private boolean dirty = true;
    private boolean doUpdateOnly = false;

    public LWJGLSWTCanvas(Composite parent, int style, GLData data)
            throws LWJGLException {
        super(parent, style, data);
        renderRunner = new Runnable() {

            public void run() {
                if (!inited) {
                    init();
                }
                if (syncRate > 0) {
                    long sinceLast = System.nanoTime() - lastRender;
                    if (sinceLast < syncNS) {
                        try {
                            Thread.sleep((Math
                                    .round((syncNS - sinceLast) / 1000000L)));
                        } catch (InterruptedException e) {
                        }
                    }
                    lastRender = System.nanoTime();
                }
                render();
            }
        };
    }

    public void setImplementor(JMECanvasImplementor impl) {
        this.impl = impl;
    }

    public void init() {
        
        if( glInitialized ){
            return;
        }
        glInitialized = true;
        
        
        try {
            LWJGLDisplaySystem display = (LWJGLDisplaySystem) DisplaySystem
                    .getDisplaySystem();
            display.switchContext(this);
            setCurrent();
            GLContext.useContext(this);

            // Complete canvas initialization.
            Point size = this.getSize();
            display.initForCanvas(Math.max(size.x, 1), Math.max(size.y, 1));

            // Perform game initialization.
            impl.doSetup();

            // TODO Should this be moved into initForCanvas?
            if (DisplaySystem.getDisplaySystem().getMinSamples() != 0
                    && GLContext.getCapabilities().GL_ARB_multisample) {
                GL11.glEnable(ARBMultisample.GL_MULTISAMPLE_ARB);
            }

            inited = true;
        } catch (Exception e) {
            logger.log(Level.SEVERE, "Exception in initGL()", e);
        }
    }

    public void render() {
        if (!isDisposed()) {
            try {
                setCurrent();

                ((LWJGLDisplaySystem) DisplaySystem.getDisplaySystem())
                        .switchContext(this);
                GLContext.useContext(this);

                if (!doUpdateOnly) {
                    if (updateInput) {
                        InputSystem.update();
                    }
    
                    GameTaskQueueManager.getManager().getQueue(
                            GameTaskQueue.UPDATE).execute();
    
                    impl.doUpdate();
    
                    if (!drawWhenDirty || dirty) {
                        GameTaskQueueManager.getManager().getQueue(
                                GameTaskQueue.RENDER).execute();
    
                        impl.doRender();
    
                        swapBuffers();
                    }
                } else {
                    impl.doUpdate();
                }
                dirty = false;
            } catch (LWJGLException e) {
                logger.log(Level.SEVERE, "Exception in render()", e);
            }
            getDisplay().asyncExec(renderRunner);
        }
    }

    public boolean isDoUpdateOnly() {
        return doUpdateOnly;
    }

    /**
     * Use this to bypass the game task queue and other workings of canvas
     * @param doUpdateOnly
     */
    public void setDoUpdateOnly(boolean doUpdateOnly) {
        this.doUpdateOnly = doUpdateOnly;
    }

    public boolean isUpdateInput() {
        return updateInput;
    }

    public void setUpdateInput(boolean doUpdate) {
        updateInput = doUpdate;
    }

    public void setTargetRate(int fps) {
        this.syncRate = fps;
        this.syncNS = 1000000000.0 / syncRate;
    }

    public int getTargetSyncRate() {
        return syncRate;
    }

    public void setDrawWhenDirty(boolean whenDirty) {
        this.drawWhenDirty = whenDirty;
    }

    public boolean isDrawWhenDirty() {
        return drawWhenDirty;
    }

    public void makeDirty() {
        dirty = true;
    }

    public boolean isDirty() {
        return dirty;
    }
    
    @Override
    public void dispose() {
                if ( shouldAutoKillContext ) {
            glInitialized = false;
            super.dispose();
}
    }

    public void setAutoKillGfxContext( boolean shouldAutoKillGfxContext ) {
        this.shouldAutoKillContext = shouldAutoKillGfxContext;
    }

    public boolean shouldAutoKillGfxContext() {
        return shouldAutoKillContext;
    }
    
    public void killGfxContext() {
        glInitialized = false;
        super.dispose();
    }
}