OpenGL ES 旋转的正方形

  继续正方形，让它旋转起来：

public class GL3 extends Activity {

	private GLSurfaceView mGLSurfaceView;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		mGLSurfaceView = new GLSurfaceView(this);
		mGLSurfaceView.setRenderer(new Three());
		setContentView(mGLSurfaceView);
	}

	@Override
	protected void onResume() {
		super.onResume();
		mGLSurfaceView.onResume();
	}

	@Override
	protected void onPause() {
		super.onPause();
		mGLSurfaceView.onPause();
	}
}

class Three implements Renderer {

	private Square square;
	private float rquad;
	
	public Three(){
		square = new Square();
	}
	
	@Override
	public void onSurfaceCreated(GL10 gl, EGLConfig config) {
		gl.glShadeModel(GL10.GL_SMOOTH);
		gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
		gl.glClearDepthf(1.0f);
		gl.glEnable(GL10.GL_DEPTH_TEST);
		gl.glDepthFunc(GL10.GL_LEQUAL);
		
		gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
	}

	@Override
	public void onSurfaceChanged(GL10 gl, int width, int height) {
		if(height == 0){
			height = 1;
		}
		
		gl.glViewport(0, 0, width, height);
		gl.glMatrixMode(GL10.GL_PROJECTION);
		gl.glLoadIdentity();
		
		GLU.gluPerspective(gl, 45.0f, (float)width / (float)height, 0.1f, 100.0f);
		
		gl.glMatrixMode(GL10.GL_MODELVIEW);
		gl.glLoadIdentity();
	}

	@Override
	public void onDrawFrame(GL10 gl) {
		Log.i("onDrawFrame", "........." + rquad);
		gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
		gl.glLoadIdentity();
		
		gl.glTranslatef(0.0f, 0.0f, -6.0f);
		
		/**
		 * 旋转函数 
		 * 用当前的矩阵乘一个旋转矩阵，将值作为当前矩阵
		 * 
		 * rquad为旋转角度，不断递增
		 */
//		gl.glRotatef(rquad, 1.0f, 0.0f, 0.0f);	//围绕X轴旋转
//		gl.glRotatef(rquad, 0.0f, 1.0f, 0.0f);	//围绕Y轴旋转
		gl.glRotatef(rquad, 0.0f, 0.0f, 1.0f);	//围绕Z轴旋转
		square.draw(gl);
		
		gl.glLoadIdentity();
		
		rquad += 0.5f;
	}

}

class Square {
	private FloatBuffer vertexBuffer;

	private float vertices[] = { -1.0f, -1.0f, 0.0f, 1.0f, -1.0f, 0.0f, -1.0f,
			1.0f, 0.0f, 1.0f, 1.0f, 0.0f };

	public Square() {
		ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
		byteBuf.order(ByteOrder.nativeOrder());
		vertexBuffer = byteBuf.asFloatBuffer();
		vertexBuffer.put(vertices);
		vertexBuffer.position(0);
	}

	public void draw(GL10 gl) {
		gl.glFrontFace(GL10.GL_CW);
		gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		//这里给正方形设置了颜色RGBA值
		gl.glColor4f(0.5f, 0.5f, 1.0f, 1.0f);
		gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3);
		gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
	}
}

 

画正方形注释，见：http://yuanyao.iteye.com/blog/782474