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第8章 3D基本形状/Sample8_1/src/com/bn/Sample8_1/CylinderSideL.java
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234
第8章 3D基本形状/Sample8_1/src/com/bn/Sample8_1/CylinderSideL.java
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package com.bn.Sample8_1;
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import static com.bn.Sample8_1.ShaderUtil.createProgram;
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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 android.opengl.GLES20;
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//圆柱侧面骨架类
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public class CylinderSideL
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{
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int mProgram;//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
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int maPositionHandle; //顶点位置属性引用
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int maColorHandle; //顶点颜色属性引用
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int muMMatrixHandle;//位置、旋转、缩放变换矩阵
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int maCameraHandle; //摄像机位置属性引用
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int maNormalHandle; //顶点法向量属性引用
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int maLightLocationHandle;//光源位置属性引用
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String mVertexShader;//顶点着色器代码脚本
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String mFragmentShader;//片元着色器代码脚本
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FloatBuffer mVertexBuffer;//顶点坐标数据缓冲
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FloatBuffer mColorBuffer; //顶点颜色数据缓冲
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FloatBuffer mNormalBuffer;//顶点法向量数据缓冲
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int vCount=0;
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float xAngle=0;//绕x轴旋转的角度
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float yAngle=0;//绕y轴旋转的角度
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float zAngle=0;//绕z轴旋转的角度
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public CylinderSideL(MySurfaceView mv,float scale,float r,float h,int n)
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{
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//调用初始化顶点数据的initVertexData方法
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initVertexData(scale,r,h,n);
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//调用初始化着色器的intShader方法
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initShader(mv);
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}
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//自定义初始化顶点坐标数据的方法
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public void initVertexData(
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float scale, //大小
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float r, //半径
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float h, //高度
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int n //切分的份数
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)
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{
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r=scale*r;
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h=scale*h;
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float angdegSpan=360.0f/n;
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vCount=3*n*4;//顶点个数，共有3*n*4个三角形，每个三角形都有三个顶点
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//坐标数据初始化
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float[] vertices=new float[vCount*3];
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float[] colors=new float[vCount*4];//顶点颜色值数组
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//坐标数据初始化
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int count=0;
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int colorCount=0;
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for(float angdeg=0;Math.ceil(angdeg)<360;angdeg+=angdegSpan)//侧面
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{
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double angrad=Math.toRadians(angdeg);//当前弧度
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double angradNext=Math.toRadians(angdeg+angdegSpan);//下一弧度
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//底圆当前点---0
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vertices[count++]=(float) (-r*Math.sin(angrad));
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vertices[count++]=0;
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vertices[count++]=(float) (-r*Math.cos(angrad));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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//顶圆下一点---3
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vertices[count++]=(float) (-r*Math.sin(angradNext));
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vertices[count++]=h;
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vertices[count++]=(float) (-r*Math.cos(angradNext));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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//顶圆当前点---2
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vertices[count++]=(float) (-r*Math.sin(angrad));
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vertices[count++]=h;
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vertices[count++]=(float) (-r*Math.cos(angrad));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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//底圆当前点---0
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vertices[count++]=(float) (-r*Math.sin(angrad));
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vertices[count++]=0;
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vertices[count++]=(float) (-r*Math.cos(angrad));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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//底圆下一点---1
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vertices[count++]=(float) (-r*Math.sin(angradNext));
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vertices[count++]=0;
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vertices[count++]=(float) (-r*Math.cos(angradNext));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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//顶圆下一点---3
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vertices[count++]=(float) (-r*Math.sin(angradNext));
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vertices[count++]=h;
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vertices[count++]=(float) (-r*Math.cos(angradNext));
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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colors[colorCount++]=1;
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}
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ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);//创建顶点坐标数据缓冲
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vbb.order(ByteOrder.nativeOrder());//设置字节顺序为本地操作系统顺序
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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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//法向量数据初始化
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for(int i=0;i<vertices.length;i++){
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if(i%3==1){
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vertices[i]=0;
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}
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}
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ByteBuffer nbb = ByteBuffer.allocateDirect(vertices.length*4);//创建顶点法向量数据缓冲
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nbb.order(ByteOrder.nativeOrder());//设置字节顺序为本地操作系统顺序
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mNormalBuffer = nbb.asFloatBuffer();//转换为float型缓冲
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mNormalBuffer.put(vertices);//向缓冲区中放入顶点法向量数据
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mNormalBuffer.position(0);//设置缓冲区起始位置
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//创建顶点着色数据缓冲
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ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length*4);
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cbb.order(ByteOrder.nativeOrder());//设置字节顺序为本地操作系统顺序
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mColorBuffer = cbb.asFloatBuffer();//转换为Float型缓冲
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mColorBuffer.put(colors);//向缓冲区中放入顶点着色数据
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mColorBuffer.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
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public void initShader(MySurfaceView mv)
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{
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//加载顶点着色器的脚本内容
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mVertexShader=ShaderUtil.loadFromAssetsFile("vertex_color_light.sh", mv.getResources());
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//加载片元着色器的脚本内容
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mFragmentShader=ShaderUtil.loadFromAssetsFile("frag_color_light.sh", mv.getResources());
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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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mProgram = createProgram(mVertexShader, mFragmentShader);
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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(mProgram, "aPosition");
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//获取程序中顶点颜色属性引用id
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maColorHandle= GLES20.glGetAttribLocation(mProgram, "aColor");
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//获取程序中总变换矩阵引用id
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muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
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//获取程序中顶点法向量属性引用id
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maNormalHandle= GLES20.glGetAttribLocation(mProgram, "aNormal");
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//获取程序中摄像机位置引用id
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maCameraHandle=GLES20.glGetUniformLocation(mProgram, "uCamera");
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//获取程序中光源位置引用id
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maLightLocationHandle=GLES20.glGetUniformLocation(mProgram, "uLightLocation");
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//获取位置、旋转变换矩阵引用id
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muMMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMMatrix");
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}
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public void drawSelf()
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{
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//制定使用某套shader程序
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GLES20.glUseProgram(mProgram);
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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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//将位置、旋转变换矩阵传入shader程序
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GLES20.glUniformMatrix4fv(muMMatrixHandle, 1, false, MatrixState.getMMatrix(), 0);
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//将摄像机位置传入shader程序
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GLES20.glUniform3fv(maCameraHandle, 1, MatrixState.cameraFB);
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//将光源位置传入shader程序
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GLES20.glUniform3fv(maLightLocationHandle, 1, MatrixState.lightPositionFB);
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//传送顶点位置数据
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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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//传送顶点坐标数据
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GLES20.glVertexAttribPointer
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(
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maColorHandle,
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4,
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GLES20.GL_FLOAT,
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false,
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4*4,
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mColorBuffer
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);
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//传送顶点法向量数据
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GLES20.glVertexAttribPointer
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(
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maNormalHandle,
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4,
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GLES20.GL_FLOAT,
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false,
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3*4,
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mNormalBuffer
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);
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//启用顶点位置数据
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GLES20.glEnableVertexAttribArray(maPositionHandle);
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//启用顶点颜色数据
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GLES20.glEnableVertexAttribArray(maColorHandle);
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//启用顶点法向量数据
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GLES20.glEnableVertexAttribArray(maNormalHandle);
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//绘制线条的粗细
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GLES20.glLineWidth(2);
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//绘制
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GLES20.glDrawArrays(GLES20.GL_LINES, 0, vCount);
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}
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}
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