Android OpenGL 画简单的三角形

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        MyGLSurfaceView view = new MyGLSurfaceView(this);         view.setRenderer(new Myrenderer());        setContentView(view);    }    class  MyGLSurfaceView extends GLSurfaceView {        public MyGLSurfaceView(Context context) {            super(context);        }        public MyGLSurfaceView(Context context, AttributeSet attrs) {            super(context, attrs);        }    }//渲染器class  Myrenderer implements GLSurfaceView.Renderer{          //表层创建                @Override                public void onSurfaceCreated(GL10 gl, EGLConfig config) {                   //设置清屏色                    gl.glClearColor(1,1,1,1);                    //启用顶点缓冲区                    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);                }               //表层size时候                @Override                public void onSurfaceChanged(GL10 gl, int width, int height) {                //设置视口                   gl.glViewport(0,0,width,height);                    //视口比例                    float tatio=(float)width/(float)height;                    //矩形模式 投影矩阵，                    gl.glMatrixMode(GL10.GL_PROJECTION);                    //加载单位矩阵                    gl.glLoadIdentity();                    //平截投体                    gl.glFrustumf(-1f,1f,-tatio,tatio,3,7);                }           //绘图                @Override                public void onDrawFrame(GL10 gl) {                    //004眼球的位置                    //000眼球的观察点                    //020眼球向上的向量                    //模型视图矩阵                    gl.glClear(GL10.GL_COLOR_BUFFER_BIT);                    gl.glMatrixMode(GL10.GL_MODELVIEW);                    gl.glLoadIdentity();                    GLU.gluLookAt(gl,0,0,4,0,0,0,0,2,0);                    float[] coords={                            0f,0f,0f,                            0f,0.5f,0f,                            0.5f,0.5f,0f,                    };                    //分配字节缓冲空间，存放顶点坐标                    ByteBuffer byteBuffer=ByteBuffer.allocateDirect(coords.length*4);               //设置本地顺序                 byteBuffer.order(ByteOrder.nativeOrder());                    FloatBuffer fbyebuffer = byteBuffer.asFloatBuffer();                    fbyebuffer.put(coords);                    byteBuffer.position(0);//设置指针位置                    gl.glColor4f(0f,1f,0f,1);//颜色                    //3三维点                    gl.glVertexPointer(3,GL10.GL_FLOAT,0,byteBuffer);                  //三角形                   gl.glDrawArrays(GL10.GL_TRIANGLES,0,4);                }            }}
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