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homework2 #150

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246 changes: 246 additions & 0 deletions NB15074刘溢辉/homework2/homework.cpp
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import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLU;
import android.opengl.GLUtils;

public class CubeRenderer implements Renderer {

Bitmap bmp;
float box[] = new float[] {
// FRONT
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
// BACK
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
// LEFT
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
// RIGHT
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
// TOP
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
// BOTTOM
-0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, -0.5f,
};

float lightAmbient[] = new float[] { 0.5f, 0.5f, 0.6f, 1.0f }; //环境光
float lightDiffuse[] = new float[] { 0.6f, 0.6f, 0.6f, 1.0f };//漫反射光
float[] lightPos = new float[] {0,0,3,1}; //光源位置
/*
* 因为进行光照处理，你必须告知系统你定义的模型各个面的方向，以便系统计算光影情况，方向的描述是通过向量点来描述的
*/
float norms[] = new float[] { //法向量数组，用于描述个顶点的方向，以此说明各个面的方向
// FRONT
0f, 0f, 1f, //方向为(0,0,0)至(0,0,1)即Z轴正方向
0f, 0f, 1f,
0f, 0f, 1f,
0f, 0f, 1f,
// BACK
0f, 0f, -1f,
0f, 0f, -1f,
0f, 0f, -1f,
0f, 0f, -1f,
// LEFT
-1f, 0f, 0f,
-1f, 0f, 0f,
-1f, 0f, 0f,
-1f, 0f, 0f,
// RIGHT
1f, 0f, 0f,
1f, 0f, 0f,
1f, 0f, 0f,
1f, 0f, 0f,
// TOP
0f, 1f, 0f,
0f, 1f, 0f,
0f, 1f, 0f,
0f, 1f, 0f,
// BOTTOM
0f, -1f, 0f,
0f, -1f, 0f,
0f, -1f, 0f,
0f, -1f, 0f
};


float texCoords[] = new float[] { //纹理坐标对应数组
// FRONT
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
// BACK
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
0.0f, 1.0f,
// LEFT
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
0.0f, 1.0f,
// RIGHT
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
0.0f, 1.0f,
// TOP
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 1.0f,
// BOTTOM
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
0.0f, 1.0f
};


FloatBuffer cubeBuff;
FloatBuffer normBuff;
FloatBuffer texBuff;

float xrot = 0.0f;
float yrot = 0.0f;

/**
* 将float数组转换存储在字节缓冲数组
* @param arr
* @return
*/
public FloatBuffer makeFloatBuffer(float[] arr) {
ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4);//分配缓冲空间，一个float占4个字节
bb.order(ByteOrder.nativeOrder()); //设置字节顺序， 其中ByteOrder.nativeOrder()是获取本机字节顺序
FloatBuffer fb = bb.asFloatBuffer(); //转换为float型
fb.put(arr); //添加数据
fb.position(0); //设置数组的起始位置
return fb;
}

public CubeRenderer(Context c) {
// TODO Auto-generated constructor stub
cubeBuff = makeFloatBuffer(box);//转换float数组
normBuff = makeFloatBuffer(norms);
texBuff = makeFloatBuffer(texCoords);
bmp = BitmapFactory.decodeResource(c.getResources(), R.drawable.splash);
}


protected void init(GL10 gl) {
gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);//R，G，B，A

gl.glEnable(GL10.GL_LIGHTING);
gl.glEnable(GL10.GL_LIGHT0);
gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, lightAmbient, 0);
gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, lightDiffuse, 0);
gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, lightPos, 0);

gl.glNormalPointer(GL10.GL_FLOAT, 0, normBuff);
gl.glEnableClientState(GL10.GL_NORMAL_ARRAY);

//使用纹理步骤：
// 1.开启贴图
gl.glEnable(GL10.GL_TEXTURE_2D);

// 2.生成纹理ID
int[] tmp_tex = new int[1];//尽管只有一个纹理，但使用一个元素的数组
//glGenTextures(申请个数，存放数组，偏移值）
gl.glGenTextures(1, tmp_tex, 0); //向系统申请可用的，用于标示纹理的ID
int texture = tmp_tex[0];

//3.绑定纹理，使得指定纹理处于活动状态。一次只能激活一个纹理
gl.glBindTexture(GL10.GL_TEXTURE_2D, texture);

//4.绑定纹理数据，传入指定图片
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp, 0);

//5.传递各个顶点对应的纹理坐标
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texBuff);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); //开启纹理坐标数组


gl.glTexParameterx(GL10.GL_TEXTURE_2D,GL10.GL_TEXTURE_MAG_FILTER,GL10.GL_LINEAR);
gl.glTexParameterx(GL10.GL_TEXTURE_2D,GL10.GL_TEXTURE_MIN_FILTER,GL10.GL_LINEAR);


gl.glEnable(GL10.GL_DEPTH_TEST); //启用深度缓存
gl.glEnable(GL10.GL_CULL_FACE); //启用背面剪裁
gl.glClearDepthf(1.0f); // 设置深度缓存值
gl.glDepthFunc(GL10.GL_LEQUAL); // 设置深度缓存比较函数，GL_LEQUAL表示新的像素的深度缓存值小于等于当前像素的深度缓存值（通过gl.glClearDepthf(1.0f)设置）时通过深度测试
gl.glShadeModel(GL10.GL_SMOOTH);// 设置阴影模式GL_SMOOTH
}

@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// TODO Auto-generated method stub
init(gl);
}

@Override
public void onSurfaceChanged(GL10 gl, int w, int h) {
// TODO Auto-generated method stub
gl.glViewport(0, 0, w, h); //设置视窗
gl.glMatrixMode(GL10.GL_PROJECTION); // 设置投影矩阵
gl.glLoadIdentity(); //设置矩阵为单位矩阵，相当于重置矩阵
GLU.gluPerspective(gl, 45.0f, ((float) w) / h, 0.1f, 10f);//设置透视范围
}

@Override
public void onDrawFrame(GL10 gl) {
// TODO Auto-generated method stub
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);// 清除屏幕和深度缓存

gl.glMatrixMode(GL10.GL_MODELVIEW); //切换至模型观察矩阵
gl.glLoadIdentity();// 重置当前的模型观察矩阵
GLU.gluLookAt(gl, 0, 0, 3, 0, 0, 0, 0, 1, 0);//设置视点和模型中心位置

gl.glVertexPointer(3, GL10.GL_FLOAT, 0, cubeBuff);//设置顶点数据
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

gl.glRotatef(xrot, 1, 0, 0); //绕着(0,0,0)与(1,0,0)即x轴旋转
gl.glRotatef(yrot, 0, 1, 0);

gl.glColor4f(1.0f, 0, 0, 1.0f); //设置颜色，红色
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4); //绘制正方型FRONT面
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 4, 4);

gl.glColor4f(0, 1.0f, 0, 1.0f);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 8, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 12, 4);

gl.glColor4f(0, 0, 1.0f, 1.0f);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 16, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 20, 4);

xrot += 0.5f;
yrot += 0.5f;
}

}