android游戏开发（OpenGL ES绘制矩形平面）

接触android将近一年了，以前学的应用开发，现在自学android游戏开发，把自己学到的分享出来一下，（这也是我的第一篇博客），不说废话了，开始正文：

GLRender类用于图形的渲染工作，Util类用于glrender中的数据缓冲。

GLRender类：

package com.example.xu.vertexdraw;

public class GLRender implements GLSurfaceView.Renderer {
public float xrot;
public float yrot;
public float zrot;
//定义顶点缓冲
private FloatBuffer _vertexsBuffer;
//定义顶点缓冲
private FloatBuffer _vertexsBUffer;
//定义索引缓冲
private ByteBuffer _indicesBuffer;
public void onSurfaceCreated(GL10 gl,EGLConfig config){

//启用阴影平滑
gl.glShadeModel(GL10.GL_SMOOTH);
//黑色背景
gl.glClearColor(0,0,0,0);
//设置深度缓存
gl.glClearDepthf(1.0f);
//启用深度测试
gl.glEnable(GL10.GL_DEPTH_TEST);
//所做深度测试的内容
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,GL10.GL_FASTEST);
//创建顶点数据
float vertexs[] = new float[12];

vertexs[0] = 1.0f;
vertexs[1] = 1.0f;
vertexs[2] = 0.0f;

vertexs[3] = -1.0f;
vertexs[4] = 1.0f;
vertexs[5] = 0.0f;

vertexs[6] = -1.0f;
vertexs[7] = -1.0f;
vertexs[8] = 0.0f;

vertexs[9] = 1.0f;
vertexs[10] = -1.0f;
vertexs[11] = 0.0f;
//创建索引数据
byte indices[] = new byte[6];

indices[0] = 0;
indices[1] = 1;
indices[2] = 2;
indices[3] = 0;
indices[4] = 2;
indices[5] = 3;

//创建顶点缓冲
this._vertexsBuffer = Util.getFloatBuffer(vertexs);
//创建索引缓冲
this._indicesBuffer = Util.getByteBUffer(indices);

}
public 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);
//重置当前的模型观察矩阵
gl.glLoadIdentity();
//重置当前的模型观察矩阵
gl.glLoadIdentity();
//移入屏幕的一段距离
gl.glTranslatef(0.0f,0.0f,-3.0f);

//设置三个方向的旋转
gl.glRotatef(xrot,1.0f,0.0f,0.0f);
gl.glRotatef(yrot,0.0f,1.0f,0.0f);
gl.glRotatef(zrot,0.0f,0.0f,1.0f);
//允许设置顶点
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

gl.glVertexPointer(3,GL10.GL_FLOAT,0,this._vertexsBuffer);
//索引绘制法
gl.glDrawElements(GL10.GL_TRIANGLES,6,GL10.GL_UNSIGNED_BYTE,this._indicesBuffer);

//取消顶点设置
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
//结束绘制
gl.glFinish();
}
public void onSurfaceChanged(GL10 gl,int width,int heigth){
float ratio = (float) width / heigth;
//设置opengl场景的大小
gl.glViewport(0,0,width,heigth);
//设置投影矩阵
gl.glMatrixMode(GL10.GL_PROJECTION);
//重置投影矩阵
gl.glLoadIdentity();
//设置视口大小
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();
}
}

Util类：

public class Util {
public static FloatBuffer getFloatBuffer(float[] vertexs) {
FloatBuffer buffer;
ByteBuffer qbb = ByteBuffer.allocateDirect(vertexs.length * 18);
qbb.order(ByteOrder.nativeOrder());
buffer = qbb.asFloatBuffer();
buffer.put(vertexs);
buffer.position(0);
return buffer;
}

public static ByteBuffer getByteBUffer(byte[] indices) {
ByteBuffer buffer = null;
buffer = ByteBuffer.allocateDirect(indices.length);
buffer.put(indices);
buffer.position(0);
return buffer;
}
}

还需新建MySurfaceView类用于获取用户输入，实现人机交互。

（求大神勿喷，第一次写）