Flag红旗飘荡的OpenGL es 代码安卓实现

package com.bn.Sample1_1; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import android.annotation.SuppressLint; import android.opengl.GLES20; //有波浪效果的纹理矩形 public class TextureRect { int[] mPrograms=new int[3];//自定义渲染管线着色器程序id int[] muMVPMatrixHandle=new int[3];//总变换矩阵引用 int[] maPositionHandle=new int[3]; //顶点位置属性引用 int[] maTexCoorHandle=new int[3]; //顶点纹理坐标属性引用 int[] maStartAngleHandle=new int[3]; //本帧起始角度属性引用 int[] muWidthSpanHandle=new int[3];//横向长度总跨度引用 int currIndex=0;//当前着色器索引 FloatBuffer mVertexBuffer;//顶点坐标数据缓冲 FloatBuffer mTexCoorBuffer;//顶点纹理坐标数据缓冲 int vCount=0; final float WIDTH_SPAN=3.3f;//2.8f;//横向长度总跨度 float currStartAngle=0;//当前帧的起始角度0~2PI public TextureRect(MySurfaceView mv) { //初始化顶点坐标与着色数据 initVertexData(); //初始化shader initShader(mv,0,"vertex_tex_x.sh"); initShader(mv,1,"vertex_tex_xie.sh"); initShader(mv,2,"vertex_tex_xy.sh"); //启动一个线程定时换帧 new Thread() { public void run() { while(Constant.threadFlag) { currStartAngle+=(float) (Math.PI/16); try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); } //初始化顶点坐标与着色数据的方法 public void initVertexData() { final int cols=12;//列数 final int rows=cols*3/4;//行数 final float UNIT_SIZE=WIDTH_SPAN/cols;//每格的单位长度 //顶点坐标数据的初始化================begin============================ vCount=cols*rows*6;//每个格子两个三角形，每个三角形3个顶点 float vertices[]=new float[vCount*3];//每个顶点xyz三个坐标 int count=0;//顶点计数器 for(int j=0;j<rows;j++) { for(int i=0;i<cols;i++) { //计算当前格子左上侧点坐标 float zsx=-UNIT_SIZE*cols/2+i*UNIT_SIZE; float zsy=UNIT_SIZE*rows/2-j*UNIT_SIZE; float zsz=0; vertices[count++]=zsx; vertices[count++]=zsy; vertices[count++]=zsz; vertices[count++]=zsx; vertices[count++]=zsy-UNIT_SIZE; vertices[count++]=zsz; vertices[count++]=zsx+UNIT_SIZE; vertices[count++]=zsy; vertices[count++]=zsz; vertices[count++]=zsx+UNIT_SIZE; vertices[count++]=zsy; vertices[count++]=zsz; vertices[count++]=zsx; vertices[count++]=zsy-UNIT_SIZE; vertices[count++]=zsz; vertices[count++]=zsx+UNIT_SIZE; vertices[count++]=zsy-UNIT_SIZE; vertices[count++]=zsz; } } //创建顶点坐标数据缓冲 //vertices.length*4是因为一个整数四个字节 ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4); vbb.order(ByteOrder.nativeOrder());//设置字节顺序 mVertexBuffer = vbb.asFloatBuffer();//转换为Float型缓冲 mVertexBuffer.put(vertices);//向缓冲区中放入顶点坐标数据 mVertexBuffer.position(0);//设置缓冲区起始位置 //顶点纹理坐标数据的初始化================begin============================ float texCoor[]=generateTexCoor(cols,rows); //创建顶点纹理坐标数据缓冲 ByteBuffer cbb = ByteBuffer.allocateDirect(texCoor.length*4); cbb.order(ByteOrder.nativeOrder());//设置字节顺序 mTexCoorBuffer = cbb.asFloatBuffer();//转换为Float型缓冲 mTexCoorBuffer.put(texCoor);//向缓冲区中放入顶点着色数据 mTexCoorBuffer.position(0);//设置缓冲区起始位置 } //初始化shader @SuppressLint("NewApi") public void initShader(MySurfaceView mv,int index,String vertexName) { //加载顶点着色器的脚本内容 String mVertexShader=ShaderUtil.loadFromAssetsFile(vertexName, mv.getResources()); //加载片元着色器的脚本内容 String mFragmentShader=ShaderUtil.loadFromAssetsFile("frag_tex.sh", mv.getResources()); //基于顶点着色器与片元着色器创建程序 mPrograms[index] = ShaderUtil.createProgram(mVertexShader, mFragmentShader); //获取程序中顶点位置属性引用 maPositionHandle[index] = GLES20.glGetAttribLocation(mPrograms[index], "aPosition"); //获取程序中顶点纹理坐标属性引用 maTexCoorHandle[index]= GLES20.glGetAttribLocation(mPrograms[index], "aTexCoor"); //获取程序中总变换矩阵引用 muMVPMatrixHandle[index] = GLES20.glGetUniformLocation(mPrograms[index], "uMVPMatrix"); //获取本帧起始角度属性引用 maStartAngleHandle[index]=GLES20.glGetUniformLocation(mPrograms[index], "uStartAngle"); //获取横向长度总跨度引用 muWidthSpanHandle[index]=GLES20.glGetUniformLocation(mPrograms[index], "uWidthSpan"); } @SuppressLint("NewApi") public void drawSelf(int texId) { //制定使用某套shader程序 GLES20.glUseProgram(mPrograms[currIndex]); //将最终变换矩阵传入shader程序 GLES20.glUniformMatrix4fv(muMVPMatrixHandle[currIndex], 1, false, MatrixState.getFinalMatrix(), 0); //将本帧起始角度传入shader程序 GLES20.glUniform1f(maStartAngleHandle[currIndex], currStartAngle); //将横向长度总跨度传入shader程序 GLES20.glUniform1f(muWidthSpanHandle[currIndex], WIDTH_SPAN); //传入数据 //将顶点位置数据传入渲染管线 GLES20.glVertexAttribPointer ( maPositionHandle[currIndex], 3, GLES20.GL_FLOAT, false, 3*4, mVertexBuffer ); //将顶点纹理坐标数据传入渲染管线 GLES20.glVertexAttribPointer ( maTexCoorHandle[currIndex], 2, GLES20.GL_FLOAT, false, 2*4, mTexCoorBuffer ); //启用顶点位置、纹理坐标数据 GLES20.glEnableVertexAttribArray(maPositionHandle[currIndex]); GLES20.glEnableVertexAttribArray(maTexCoorHandle[currIndex]); //绑定纹理 GLES20.glActiveTexture(GLES20.GL_TEXTURE0); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId); GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount); } //自动切分纹理产生纹理数组的方法 public float[] generateTexCoor(int bw,int bh) { float[] result=new float[bw*bh*6*2]; float sizew=1.0f/bw;//列数 float sizeh=0.75f/bh;//行数 int c=0; for(int i=0;i<bh;i++) { for(int j=0;j<bw;j++) { //每行列一个矩形，由两个三角形构成，共六个点，12个纹理坐标 float s=j*sizew; float t=i*sizeh; result[c++]=s; result[c++]=t; result[c++]=s; result[c++]=t+sizeh; result[c++]=s+sizew; result[c++]=t; result[c++]=s+sizew; result[c++]=t; result[c++]=s; result[c++]=t+sizeh; result[c++]=s+sizew; result[c++]=t+sizeh; } } return result; } }