osg for android (一) 简单几何物体的加载与显示

• 1. 首先需要一个OSG for android的环境.
• (1).NDK 现在Eclipse 对NDK已经相当友好了，已经不需要另外cygwin的参与，具体可以参考
• Android NDK开发篇(一)：新版NDK环境搭建(免Cygwin，超级快) 
• (2).osg for android的编译，参考 osg for android学习之一：windows下编译(亲测通过) 建议编译OpenGL ES2版本.
• 2.然后加载OSG自带的Example：osgAndroidExampleGLES2
•  
  (1)点击菜单键加载文件路径，输入/sdcard/osg/cow.osg(必须先往sdcard创建文件夹osg并把cow.osg放到该文件夹里边)                                                                                           

(2)接着经典的牛出现了:)     

                                                                                                           

3.自带的example太多的代码，这样的代码无论对于NDK的初学者或OSG很不直观，所以本人重写了一个HelloWolrd for osg的例子。例子很简单，就是简单加载一个四边形并附上颜色。

(1)Java 代码：

 

package com.example.helloosg;
import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

    private GLSurfaceView mGLSurfaceView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mGLSurfaceView = new GLSurfaceView(this);
        mGLSurfaceView.setEGLContextClientVersion(2);
        NDKRenderer renderer = new NDKRenderer();
        this.mGLSurfaceView.setRenderer(renderer);
        this.setContentView(mGLSurfaceView);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        mGLSurfaceView.onResume();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        mGLSurfaceView.onPause();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}