xiaoyan159/Android-OpenGL-Simple
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

初次提交

Browse Source
This commit is contained in:
xiaoyan
2022-09-19 18:05:01 +08:00
commit 57051fc44b
5401 changed files with 325410 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

194
第22章 夜鹰行动/AircraftAttack/src/com/bn/planeModel/DrawSpheroid.java Normal file
View File

@@ -0,0 +1,194 @@
package com.bn.planeModel;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.ArrayList;
import android.opengl.GLES20;
import com.bn.core.MatrixState;
/*
* 创建椭球体类 顶点和纹理
* 用于绘制机身,机头和机舱
*/
public class DrawSpheroid
{
int mProgram;//自定义渲染管线着色器程序id
int muMVPMatrixHandle;//总变换矩阵引用id
int maPositionHandle; //顶点位置属性引用id
int maTexCoorHandle; //顶点纹理坐标属性引用id
String mVertexShader;//顶点着色器代码脚本
String mFragmentShader;//片元着色器代码脚本
private FloatBuffer mVertexBuffer;//顶点坐标数据缓冲
private FloatBuffer mTextureBuffer;//纹理缓冲
public float mAngleX;//沿x轴旋转角度
public float mAngleY;//沿y轴旋转角度
public float mAngleZ;//沿z轴旋转角度
int vCount=0;
float a;
float b; //三轴半径长
float c;
float angleSpan;//将球进行单位切分的角度
float hAngleBegin;//经度绘制起始角度
float hAngleOver;//经度绘制结束角度
float vAngleBegin;//纬度绘制起始角度
float vAngleOver;//纬度绘制结束角度
//hAngle表示经度，vAngle表示纬度。
public DrawSpheroid(float a,float b,float c,float angleSpan,
float hAngleBegin,float hAngleOver,float vAngleBegin,float vAngleOver,int mProgram)
{
this.a=a;
this.b=b;
this.c=c;
this.hAngleBegin=hAngleBegin;
this.hAngleOver=hAngleOver;
this.vAngleBegin=vAngleBegin;
this.vAngleOver=vAngleOver;
this.mProgram=mProgram;
this.angleSpan=angleSpan;
initVertexData();
initShader();
}
//初始化顶点的信息
public void initVertexData()
{
ArrayList<Float> alVertix=new ArrayList<Float>();//存放顶点坐标
for(float vAngle=vAngleBegin;vAngle<vAngleOver;vAngle=vAngle+angleSpan)//垂直方向angleSpan度一份
{
for(float hAngle=hAngleBegin;hAngle<hAngleOver;hAngle=hAngle+angleSpan)//水平方向angleSpan度一份
{//纵向横向各到一个角度后计算对应的此点在球面上的坐标
float x1=(float)(a*Math.cos(Math.toRadians(vAngle))*Math.cos(Math.toRadians(hAngle)));
float y1=(float)(b*Math.cos(Math.toRadians(vAngle))*Math.sin(Math.toRadians(hAngle)));
float z1=(float)(c*Math.sin(Math.toRadians(vAngle)));
float x2=(float)(a*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.cos(Math.toRadians(hAngle)));
float y2=(float)(b*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.sin(Math.toRadians(hAngle)));
float z2=(float)(c*Math.sin(Math.toRadians(vAngle+angleSpan)));
float x3=(float)(a*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.cos(Math.toRadians(hAngle+angleSpan)));
float y3=(float)(b*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.sin(Math.toRadians(hAngle+angleSpan)));
float z3=(float)(c*Math.sin(Math.toRadians(vAngle+angleSpan)));
float x4=(float)(a*Math.cos(Math.toRadians(vAngle))*Math.cos(Math.toRadians(hAngle+angleSpan)));
float y4=(float)(b*Math.cos(Math.toRadians(vAngle))*Math.sin(Math.toRadians(hAngle+angleSpan)));
float z4=(float)(c*Math.sin(Math.toRadians(vAngle)));
//将计算出来的XYZ坐标加入存放顶点坐标的ArrayList
alVertix.add(x1);alVertix.add(y1);alVertix.add(z1);
alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);
alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);
alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
alVertix.add(x3);alVertix.add(y3);alVertix.add(z3);
}
}
vCount=alVertix.size()/3;//顶点的数量为坐标值数量的1/3，因为一个顶点有3个坐标
//将alVertix中的坐标值转存到一个int数组中
float[] vertices=new float[vCount*3];
for(int i=0;i<alVertix.size();i++)
{
vertices[i]=alVertix.get(i);
}
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
vbb.order(ByteOrder.nativeOrder());//设置字节顺序为本地操作系统顺序
mVertexBuffer = vbb.asFloatBuffer();//转换为int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
//纹理
//获取切分整图的纹理数组
float[] texCoorArray=
generateTexCoor
(
(int)(180/angleSpan), //纹理图切分的列数
(int)(180/angleSpan) //纹理图切分的行数
);
ByteBuffer tbb=ByteBuffer.allocateDirect(texCoorArray.length*4);
tbb.order(ByteOrder.nativeOrder());
mTextureBuffer=tbb.asFloatBuffer();
mTextureBuffer.put(texCoorArray);
mTextureBuffer.position(0);
}
//初始化着色器的initShader方法
public void initShader()
{
//获取程序中顶点位置属性引用id
maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
//获取程序中顶点纹理坐标属性引用id
maTexCoorHandle= GLES20.glGetAttribLocation(mProgram, "aTexCoor");
//获取程序中总变换矩阵引用id
muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
}
public void drawSelf(int texId)
{
MatrixState.pushMatrix();
MatrixState.rotate(mAngleX, 1, 0, 0);
MatrixState.rotate(mAngleY, 0, 1, 0);
MatrixState.rotate(mAngleZ, 0, 0, 1);
//制定使用某套shader程序
GLES20.glUseProgram(mProgram);
//将最终变换矩阵传入shader程序
GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
//传入顶点位置数据
GLES20.glVertexAttribPointer
(
maPositionHandle,
3,
GLES20.GL_FLOAT,
false,
3*4,
mVertexBuffer
);
//传入顶点纹理坐标数据
GLES20.glVertexAttribPointer
(
maTexCoorHandle,
2,
GLES20.GL_FLOAT,
false,
2*4,
mTextureBuffer
);
//允许顶点位置数据数组
GLES20.glEnableVertexAttribArray(maPositionHandle);
GLES20.glEnableVertexAttribArray(maTexCoorHandle);
//绑定纹理
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
//绘制纹理矩形
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount);
MatrixState.popMatrix();
}
//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=1.0f/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;
}
}