Android OpenGL ES 2.0入门学习 1

从今天我开始学习Android OpenGL ES 2.0,写下博客作为记录。

首先创建一个空白的项目；

主界面MainActivity.java代码：

import android.app.Activity;
import android.app.ActivityManager;
import android.content.pm.ConfigurationInfo;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {
private GLSurfaceView glSurfaceView;//初始化
private boolean rendererSet=false;//是否处在有效状态

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
glSurfaceView=new GLSurfaceView(this);
//检查系统是否支持OpenGL ES 2.0
ActivityManager activityManager= (ActivityManager) getSystemService(ACTIVITY_SERVICE);
ConfigurationInfo configurationInfo=activityManager.getDeviceConfigurationInfo();
boolean supportses2=configurationInfo.reqGlEsVersion>=20000;
if(supportses2){
glSurfaceView.setEGLContextClientVersion(2);
glSurfaceView.setRenderer(new FirstOpenRenderer());
rendererSet=true;
}else {
Toast.makeText(this,"This device does not support OpenGL ES 2.0",Toast.LENGTH_LONG).show();
return;
}
setContentView(glSurfaceView);
}

@Override
protected void onPause() {
super.onPause();
if(rendererSet){
glSurfaceView.onPause();
}
}

@Override
protected void onResume() {
super.onResume();
if(rendererSet){
glSurfaceView.onResume();
}
}
}

类 FirstOpenRendererd.java代码：
import android.opengl.GLSurfaceView;
import static android.opengl.GLES20.GL_COLOR_BUFFER_BIT;
import static android.opengl.GLES20.glClear;
import static android.opengl.GLES20.glClearColor;
import static android.opengl.GLES20.glViewport;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

/**
* Created by Administrator on 2017/2/16.
*/

public class FirstOpenRenderer implements GLSurfaceView.Renderer{
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
glClearColor(1.0f,0.0f,0.0f,0.0f);
}

@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
glViewport(0,0,width,height);
}

@Override
public void onDrawFrame(GL10 gl) {
glClear(GL_COLOR_BUFFER_BIT);
}
}
代码运行结果：会看到空白的红色屏幕。
写博客主要是为了自己学习记录，书籍《OpenGL ES 应用开发实践指南》中有详细介绍。