210 lines
6.3 KiB
Java
210 lines
6.3 KiB
Java
package com.bn.clp;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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import com.bn.core.MatrixState;
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import android.opengl.GLES20;
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import static com.bn.clp.Constant.*;
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//有波浪效果的水面
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public class Water
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{
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int mPrograms;//自定义渲染管线着色器程序id
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int muMVPMatrixHandle;//总变换矩阵引用id
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int maPositionHandle; //顶点位置属性引用id
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int maTexCoorHandle; //顶点纹理坐标属性引用id
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int maSTOffset; //水面纹理图的偏移量引用id
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static float[] mMMatrix = new float[16];//具体物体的移动旋转矩阵
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FloatBuffer mVertexBuffer;//顶点坐标数据缓冲
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FloatBuffer mTexCoorBuffer;//顶点纹理坐标数据缓冲
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int vCount=0; //顶点数量
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float currStartST=0; //水面纹理坐标的当前起始坐标0~1
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public Water(int programId,int rows,int cols)
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{
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//初始化顶点坐标的initVertexData方法
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initVertexData(rows,cols);
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//初始化着色器的方法
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initShader(programId);
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//启动一个线程定时换帧
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new Thread()
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{
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public void run()
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{
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while(Constant.threadFlag)
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{
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//所谓水面定时换帧只是修改每帧起始角度即可，
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//水面顶点Y坐标的变化由顶点着色单元完成
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currStartST=(currStartST+0.004f)%1;
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try
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{
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Thread.sleep(100);
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} catch (InterruptedException e)
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{
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e.printStackTrace();
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}
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}
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}
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}.start();
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}
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//初始化顶点坐标的initVertexData方法
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public void initVertexData(int rows,int cols)
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{
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final float pre_Size=UNIT_SIZE/rows;
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//顶点坐标数据的初始化================begin============================
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vCount=cols*rows*2*3;//每个格子两个三角形，每个三角形3个顶点
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float vertices[]=new float[vCount*3];//每个顶点xyz三个坐标
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int count=0;//顶点计数器
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for(int j=0;j<rows;j++)
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{
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for(int i=0;i<cols;i++)
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{
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//计算当前格子左上侧点坐标
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float zsx=-UNIT_SIZE/2+i*pre_Size;
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float zsy=WATER_HIGH_ADJUST;
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float zsz=-UNIT_SIZE/2+j*pre_Size;
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vertices[count++]=zsx;
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vertices[count++]=zsy;
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vertices[count++]=zsz;
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vertices[count++]=zsx;
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vertices[count++]=zsy;
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vertices[count++]=zsz+pre_Size;
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vertices[count++]=zsx+pre_Size;
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vertices[count++]=zsy;
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vertices[count++]=zsz;
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vertices[count++]=zsx+pre_Size;
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vertices[count++]=zsy;
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vertices[count++]=zsz;
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vertices[count++]=zsx;
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vertices[count++]=zsy;
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vertices[count++]=zsz+pre_Size;
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vertices[count++]=zsx+pre_Size;
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vertices[count++]=zsy;
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vertices[count++]=zsz+pre_Size;
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}
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}
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//创建顶点坐标数据缓冲
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//vertices.length*4是因为一个整数四个字节
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ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
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vbb.order(ByteOrder.nativeOrder());//设置字节顺序
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mVertexBuffer = vbb.asFloatBuffer();//转换为Float型缓冲
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mVertexBuffer.put(vertices);//向缓冲区中放入顶点坐标数据
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mVertexBuffer.position(0);//设置缓冲区起始位置
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//顶点纹理坐标数据的初始化================begin============================
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float texCoor[]=generateTexCoor(cols,rows);
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//创建顶点纹理坐标数据缓冲
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ByteBuffer cbb = ByteBuffer.allocateDirect(texCoor.length*4);
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cbb.order(ByteOrder.nativeOrder());//设置字节顺序
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mTexCoorBuffer = cbb.asFloatBuffer();//转换为Float型缓冲
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mTexCoorBuffer.put(texCoor);//向缓冲区中放入顶点着色数据
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mTexCoorBuffer.position(0);//设置缓冲区起始位置
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}
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//初始化着色器的initShader方法
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public void initShader(int programId)
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{
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//基于顶点着色器与片元着色器创建程序
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mPrograms =programId;
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//获取程序中顶点位置属性引用id
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maPositionHandle = GLES20.glGetAttribLocation(mPrograms, "aPosition");
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//获取程序中顶点纹理坐标属性引用id
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maTexCoorHandle= GLES20.glGetAttribLocation(mPrograms, "aTexCoor");
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//获取程序中总变换矩阵引用id
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muMVPMatrixHandle = GLES20.glGetUniformLocation(mPrograms, "uMVPMatrix");
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//获取水面纹理图偏移量的引用id
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maSTOffset=GLES20.glGetUniformLocation(mPrograms, "stK");
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}
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public void drawSelf(int texId,float startST)
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{
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//制定使用某套shader程序
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GLES20.glUseProgram(mPrograms);
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//将最终变换矩阵传入shader程序
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GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
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//将水面纹理图的st偏移量传入shader程序
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GLES20.glUniform1f(maSTOffset, startST);
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//传入顶点位置数据
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GLES20.glVertexAttribPointer
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(
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maPositionHandle,
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3,
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GLES20.GL_FLOAT,
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false,
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3*4,
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mVertexBuffer
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);
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//传入顶点纹理坐标数据
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GLES20.glVertexAttribPointer
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(
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maTexCoorHandle,
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2,
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GLES20.GL_FLOAT,
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false,
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2*4,
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mTexCoorBuffer
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);
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//允许顶点位置、纹理坐标数据数组
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GLES20.glEnableVertexAttribArray(maPositionHandle);
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GLES20.glEnableVertexAttribArray(maTexCoorHandle);
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//绑定纹理
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GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
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//绘制纹理矩形
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GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount);
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}
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//自动切分纹理产生纹理数组的方法
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public float[] generateTexCoor(int bw,int bh)
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{
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float[] result=new float[bw*bh*6*2];
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float sizew=1.0f/bw;//列数
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float sizeh=1.0f/bh;//行数
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int c=0;
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for(int i=0;i<bh;i++)
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{
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for(int j=0;j<bw;j++)
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{
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//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
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float s=j*sizew;
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float t=i*sizeh;
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result[c++]=s;
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result[c++]=t;
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result[c++]=s;
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result[c++]=t+sizeh;
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result[c++]=s+sizew;
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result[c++]=t;
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result[c++]=s+sizew;
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result[c++]=t;
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result[c++]=s;
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result[c++]=t+sizeh;
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result[c++]=s+sizew;
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result[c++]=t+sizeh;
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}
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}
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return result;
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}
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} |