OpenGL_ES_入门

OpenGl_ES_入门
效果

package com.example.lenovo.opengl_es_demo1.mine;

import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ConfigurationInfo;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

/**
 * 入门绘制仅仅是绘制背景
 */

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


public class Demo1Activity extends AppCompatActivity {

private GLSurfaceView glSurfaceView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (!isSupportES()){
        Toast.makeText(this, "当前设备不支持OpenGL ES2.0", Toast.LENGTH_SHORT).show();
        return;
    }
    //如果支持的话
    glSurfaceView = new GLSurfaceView(this);
    //设置渲染器
    glSurfaceView.setRenderer(new MyRender());
    //设置当前的activity的内容
    setContentView(glSurfaceView);
}


class MyRender implements GLSurfaceView.Renderer{

    public MyRender(){

    }

    @Override
    public void onSurfaceCreated(GL10 gl10, EGLConfig eglConfig) {
        //设置清屏的颜色
        GLES20.glClearColor(0f,0f,0f,0f);
    }

    @Override
    public void onSurfaceChanged(GL10 gl10, int i, int i1) {
        //设置渲染的区域大小
        GLES20.glViewport(0,0,i,i1);
    }

    @Override
    public void onDrawFrame(GL10 gl10) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
    }
}
/**
 * 判断是否支持 Es2.0
 *
 * @return true 支持2.0
 */
public boolean isSupportES() {
    ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    ConfigurationInfo deviceConfigurationInfo = activityManager.getDeviceConfigurationInfo();
//        return deviceConfigurationInfo.reqGlEsVersion>=0x20000; 这段代码只能在真机上运行不能在模拟器上运行,为了兼容模拟器,应该  写如下的代码
    return deviceConfigurationInfo.reqGlEsVersion >= 0x20000
            || (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1 && (Build.FINGERPRINT.startsWith("generic")
            || Build.FINGERPRINT.startsWith("unknown")
            || Build.MODEL.contains("google_sdk")
            || Build.MODEL.contains("Emulator")
            || Build.MODEL.contains("Android SDK built for x86")));

}

}