OPenJL ES 2D图形基本用法

最近在看OPenJL ES ，看了一些资料，现在把例子记录下来，已被不时之需

 

 

public class Main extends Activity{/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);GLSurfaceView glView = new GLSurfaceView(this);MyRender myRender = new MyRender();glView.setRenderer(myRender);setContentView(glView);}}  

 

 

上面这个类没啥说的都认识

 

import java.nio.IntBuffer;import javax.microedition.khronos.egl.EGLConfig;import javax.microedition.khronos.opengles.GL10;import android.opengl.GLSurfaceView.Renderer;public class MyRender implements Renderer {int one = 0x10000;// 三角形的3个顶点private IntBuffer triggerBuffer = IntBuffer.wrap(new int[] {0, one, 0, // 上顶点-one, -one, 0, // 左下顶点one, -one, 0, // 右下顶点});// 正方形的4个顶点private IntBuffer quaterBuffer = IntBuffer.wrap(new int[] { one, one, 0, // 右上角顶点-one, one, 0, // 左上角顶点one, -one, 0, // 右下角顶点-one, -one, 0 // 左下角顶点}); private IntBuffer quaterBuffer1 = IntBuffer.wrap(new int[] { one, one, 0, // 右上角顶点-one, one, 0, // 左上角顶点-one, -one, 0, // 右下角顶点one, -one, 0 // 左下角顶点}); @Overridepublic void onDrawFrame(GL10 gl) {// 清除屏幕和深度缓存gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);// 允许设置顶点gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);// 重置当前的模型观察矩阵gl.glLoadIdentity();// 左移 1.5 单位，并移入屏幕 6.0gl.glTranslatef(1.5f, 0.0f, -6.0f);// 设置三角形的顶点坐标gl.glVertexPointer(3, GL10.GL_FIXED, 0, triggerBuffer);// 绘制三角形gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);// 重置当前的模型观察矩阵gl.glLoadIdentity();// 左移 2.0 单位，并移入屏幕 6.0gl.glTranslatef(-2.0f, 0.0f, -6.0f);// 设置正方形的顶点坐标gl.glVertexPointer(3, GL10.GL_FIXED, 0, quaterBuffer);// 绘制正方形gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 0, 4);// gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);}@Overridepublic void onSurfaceChanged(GL10 gl, int width, int height) {float ratio = (float) width / height;// 设置OpenGL场景的大小gl.glViewport(0, 0, width, height);// 设置投影矩阵gl.glMatrixMode(GL10.GL_PROJECTION);// 重置投影矩阵gl.glLoadIdentity();// 设置视口的大小gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);// 选择模型观察矩阵gl.glMatrixMode(GL10.GL_MODELVIEW);// 重置模型观察矩阵gl.glLoadIdentity();}@Overridepublic void onSurfaceCreated(GL10 gl, EGLConfig config) {}} 

ok