基本信息

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   源码介绍

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[实例简介]Open GL 入门级示例

[实例截图]

[核心代码]

package com.china.gltry;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGL11;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.egl.EGLSurface;
import javax.microedition.khronos.opengles.GL;

import android.view.SurfaceHolder;

/**
 * An EGL helper class.
 */

public class EGLHelper{
    public EGLHelper() {
    	
    }

    /**
     * Initialize EGL for a given configuration spec.
     * @param configSpec
     */
    public void start(int[] configSpec){
        /*
         * Get an EGL instance
         */
        mEgl = (EGL10) EGLContext.getEGL();

        /*
         * Get to the default display.
         */
        mEglDisplay = mEgl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);

        /*
         * We can now initialize EGL for that display
         */
        int[] version = new int[2];
        mEgl.eglInitialize(mEglDisplay, version);

        EGLConfig[] configs = new EGLConfig[1];
        int[] num_config = new int[1];
        mEgl.eglChooseConfig(mEglDisplay, configSpec, configs, 1,
                num_config);
        mEglConfig = configs[0];

        /*
        * Create an OpenGL ES context. This must be done only once, an
        * OpenGL context is a somewhat heavy object.
        */
        mEglContext = mEgl.eglCreateContext(mEglDisplay, mEglConfig,
                EGL10.EGL_NO_CONTEXT, null);

        mEglSurface = null;
    }

    /*
     * Create and return an OpenGL surface
     */
    public GL createSurface(SurfaceHolder holder) {
        /*
         *  The window size has changed, so we need to create a new
         *  surface.
         */
        if (mEglSurface != null) {
        	
            /*
             * Unbind and destroy the old EGL surface, if
             * there is one.
             */
            mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE,
                    EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
            mEgl.eglDestroySurface(mEglDisplay, mEglSurface);
        }

        /*
         * Create an EGL surface we can render into.
         */
        mEglSurface = mEgl.eglCreateWindowSurface(mEglDisplay,
                mEglConfig, holder, null);

        /*
         * Before we can issue GL commands, we need to make sure
         * the context is current and bound to a surface.
         */
        mEgl.eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface,
                mEglContext);


        GL gl = mEglContext.getGL();
   
        return gl;
    }

    /**
     * Display the current render surface.
     * @return false if the context has been lost.
     */
    public boolean swap() {
        mEgl.eglSwapBuffers(mEglDisplay, mEglSurface);

        /*
         * Always check for EGL_CONTEXT_LOST, which means the context
         * and all associated data were lost (For instance because
         * the device went to sleep). We need to sleep until we
         * get a new surface.
         */
        return mEgl.eglGetError() != EGL11.EGL_CONTEXT_LOST;
    }

    public void finish() {
        if (mEglSurface != null) {
            mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE,
                    EGL10.EGL_NO_SURFACE,
                    EGL10.EGL_NO_CONTEXT);
            mEgl.eglDestroySurface(mEglDisplay, mEglSurface);
            mEglSurface = null;
        }
        if (mEglContext != null) {
            mEgl.eglDestroyContext(mEglDisplay, mEglContext);
            mEglContext = null;
        }
        if (mEglDisplay != null) {
            mEgl.eglTerminate(mEglDisplay);
            mEglDisplay = null;
        }
    }

    EGL10 mEgl;
    EGLDisplay mEglDisplay;
    EGLSurface mEglSurface;
    EGLConfig mEglConfig;
    EGLContext mEglContext;
}