andorid openGLの簡単な使用

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//         GLSurfaceView Render
        GLSurfaceView mGlSurfaceView = new GLSurfaceView(this);  
        mGlSurfaceView.setRenderer(new TriggleRender());  
       // mGlSurfaceView.setRenderMode()
        setContentView(mGlSurfaceView);
      
    }
}

public class TriggleRender implements Renderer {

	@Override
	public void onDrawFrame(GL10 gl) {
		// TODO Auto-generated method stub

			ByteBuffer vbb= ByteBuffer.allocateDirect(vertexArray.length*4);
			vbb.order(ByteOrder.nativeOrder());
			FloatBuffer vertex = vbb.asFloatBuffer();
			vertex.put(vertexArray);
			vertex.position(0);

			gl.glLoadIdentity();
			gl.glTranslatef(0, 0, -4);

			gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

			gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertex);
			index++;
			index%=10;
			switch(index){
			case 0:
			case 1:
			case 2:
			gl.glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
			gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 6);
			break;
			case 3:
			case 4:
			case 5:
			gl.glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
			gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 6);
			break;
			case 6:
			case 7:
			case 8:
			case 9:
			gl.glColor4f(0.0f, 0.0f, 1.0f, 1.0f);
			gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 0, 6);
			break;
			}

			gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);

			} 

	@Override
	public void onSurfaceChanged(GL10 gl, int width, int height) {
		// TODO Auto-generated method stub
	// ， 	
       gl.glViewport(0, 0, width, height);
	}

	@Override
	public void onSurfaceCreated(GL10 gl, EGLConfig config) {
		// TODO Auto-generated method stub

	}
	float vertexArray[] = {
			-0.8f, -0.4f * 1.732f, 0.0f,
			0.0f, -0.4f * 1.732f, 0.0f,
			-0.4f, 0.4f * 1.732f, 0.0f,

			0.0f, -0.0f * 1.732f, 0.0f,
			0.8f, -0.0f * 1.732f, 0.0f,
			0.4f, 0.4f * 1.732f, 0.0f,
			}; 
	int index=0;
}

public class OpenGLRender implements Renderer {

	@Override
	public void onDrawFrame(GL10 gl) {
		// TODO Auto-generated method stub
		ByteBuffer vbb= ByteBuffer.allocateDirect(vertexArray.length*4);
		vbb.order(ByteOrder.nativeOrder());
		FloatBuffer vertex = vbb.asFloatBuffer();
		vertex.put(vertexArray);
		vertex.position(0);

		gl.glLoadIdentity();
		gl.glTranslatef(0, 0, -4);

		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertex);
		index++;
		index%=10;
		switch(index){
		case 0:
		case 1:
		case 2:
		gl.glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
		gl.glDrawArrays(GL10.GL_LINES, 0, 4);
		break;
		case 3:
		case 4:
		case 5:
		gl.glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
		gl.glDrawArrays(GL10.GL_LINE_STRIP, 0, 4);
		break;
		case 6:
		case 7:
		case 8:
		case 9:
		gl.glColor4f(0.0f, 0.0f, 1.0f, 1.0f);
		gl.glDrawArrays(GL10.GL_LINE_LOOP, 0, 4);
		break;
		}

		gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
	}

	@Override
	public void onSurfaceChanged(GL10 arg0, int width, int height) {
		// TODO Auto-generated method stub
		arg0.glViewport(0, 0, width, height);
	}

	@Override
	public void onSurfaceCreated(GL10 gl, EGLConfig arg1) {
		// TODO Auto-generated method stub
		// gl.glClearColor(0.9f, 0.2f, 0.2f, 1.0f);  
	    // gl.glClear(GL10.GL_COLOR_BUFFER_BIT);  
	}
	float vertexArray[] = {
			-0.8f, -0.4f * 1.732f, 0.0f,
			-0.4f, 0.4f * 1.732f, 0.0f,
			0.0f, -0.4f * 1.732f, 0.0f,
			0.4f, 0.4f * 1.732f, 0.0f,
			}; 

	int index=0;