1）场景中分别绘制太阳、地球、月球，要求位置关系大体正确，并为三者贴
上纹理。三者的旋转符合实际公转自转规律；
（2）启用z-buffer,实现面消隐；
（3）启用光照系统，光源的环境光设置为（0.2，0.2，0.2，1）漫反射（1，
1，1，1）和镜面反射光（1，1，1，1）；
（4）材料特性:太阳黄色且自己向外辐射光，地球蓝色，月球灰色；
（5）视角可以通过键盘a,d,s,w切换；
（6）采用动画设计，使得场景能够自动运行；
（7）分别采用透视、正交投影方式。
#include "stdafx.h"#include <GL/glut.h>#include<math.h>#include<GL\GLAUX.H>_AUX_RGBImageRec *sun, *earth, *moon;//纹理数据unsigned int sunID,earthID,moonID; //纹理IDdouble angle=0;float theta=60,phi=60,r=2;float eyex=0, eyey=0, eyez=0, atx=0, aty=0, atz=0;void myinit();void texInit();//纹理初始化void display();void gltDrawSphere(GLfloat fRadius, GLint iSlices, GLint iStacks);void idle();void myKeyboard();//键盘控制视角函数void myKeyboard(unsigned char key,int x,int y){switch(key){case'A':case'a':if(phi-1>-180)phi=phi-5;break;case'D':case'd':if(phi+1<0)phi=phi+5;break;case'S':case's':if(theta+1<180)theta=theta+5;break;case'W':case'w':if(theta-1>0)theta=theta-5;break;}glutPostRedisplay();}//设置光照函数void myinit(){GLfloat light_ambient[] = { 0.2,0.2,0.2,1 };//环境光GLfloat light_diffuse[] = { 1.0,1.0,1.0,1.0 };//漫反射光GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; //镜面反射光glClearColor(0.5f, 0.5f, 0.5f, 1.0f); //设置背景颜色GLfloat light_position[] = { 0, 0, 0 ,1 }; // 光源位置设置 // 创建光源//glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE,GL_FALSE);//双面光照glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);glEnable(GL_LIGHTING);// 开启光照效果glEnable(GL_LIGHT0);glEnable(GL_DEPTH_TEST); // 开启深度测试}//设置太阳，地球，月亮void display(){/*材质参数*/glClearColor(0.1, 0.1, 0.1, 1.0);glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// 清空屏幕和深度缓存glMatrixMode(GL_PROJECTION);glLoadIdentity(); // 重置当前的模型观察矩阵glOrtho(-10, 10, -6, 6, -50, 50);//glFrustum(-5, 5, -3, 3, 1, 100);gluLookAt(r*sin(theta*3.14159/180)*sin(phi*3.14159/180),r*cos(theta*3.14159/180),r*sin(theta*3.14159/180)*cos(phi*3.14159/180),0.0,0.0,0.0,0.0,0.0,1.0);//透视投影gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);glMatrixMode(GL_MODELVIEW);glLoadIdentity();//太阳glBindTexture(GL_TEXTURE_2D, sunID);// 绑定sunID,后续操作是对sun纹理进行的操作//设置纹理环境glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE ); //纹理 与 颜色的处理模式 GL_REPLACE 替换GL_DECAL贴花 GL_BLEND混合 GL_MODULATE调节glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); //纹理缩小 情况glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); //纹理放大 情况glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); //在S方向 重复纹理glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); //在T方向 重复纹理 //指定纹理数据和绑定对象关联BLENDglTexImage2D(GL_TEXTURE_2D,0, GL_RGB, sun->sizeX, sun->sizeY, 0, GL_RGB,GL_UNSIGNED_BYTE, sun->data);//设置材质GLfloat em[4] ={0.8F, 0.7F, 0.0F,0.0f}; //黄色辐射光GLfloat sun_mat_diffuse[] = {0.8f, 0.7f, 0.0f, 1.0f}; //定义材质的漫反射光颜色，偏黄色GLfloat sun_mat_specular[] = {0.8f, 0.57, 0.0f, 1.0f}; //定义材质的镜面反射光颜色，黄色GLfloat sun_mat_shininess = 100.0f; glMaterialfv(GL_FRONT, GL_DIFFUSE, sun_mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, sun_mat_specular);glMaterialf (GL_FRONT, GL_SHININESS, sun_mat_shininess); //glMaterialfv(GL_FRONT,GL_EMISSION, em);//自发光//glRotatef(angle, 1, 1, 1);gltDrawSphere(0.8, 200, 200); //绘制球体//地球glBindTexture(GL_TEXTURE_2D, earthID);//设置纹理环境glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); //纹理 与 颜色的处理模式 GL_REPLACE GL_DECAL GL_BLEND GL_MODULATEglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); //纹理缩小 情况glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); //纹理放大 情况glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); //在S方向 重复纹理glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); //在T方向 重复纹理 //指定纹理数据和绑定对象关联glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, earth->sizeX, earth->sizeY, 0, GL_RGB,GL_UNSIGNED_BYTE, earth->data);GLfloat earth_mat_diffuse[] = {0.5f, 0.5f, 0.5f, 1.0f}; //定义材质的漫反射光颜色，偏蓝色GLfloat earth_mat_specular[] = {1.0f,1.0f, 1.0f, 1.0f}; //定义材质的镜面反射光颜色，蓝色GLfloat earth_mat_shininess = 100.0f; glMaterialfv(GL_FRONT, GL_DIFFUSE, earth_mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, earth_mat_specular);glMaterialf (GL_FRONT, GL_SHININESS, earth_mat_shininess); //GLfloat bm[4] ={0.5F, 0.6F, 0.8F,1.0f}; //蓝色辐射光//glMaterialfv(GL_FRONT,GL_EMISSION, bm);//自发光glRotatef(angle/360.0*360.0, 1,1,1);glTranslatef(-3,0,0);gltDrawSphere(0.5, 200, 200); //绘制球体//glFlush();glPopMatrix();//月亮,glBindTexture(GL_TEXTURE_2D, moonID);//设置纹理环境glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ); //纹理与颜色的处理模式 GL_REPLACE GL_DECAL GL_BLEND GL_MODULATEglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); //纹理缩小情况glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); //纹理放大情况glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); //在S方向 重复纹理glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); //在T方向 重复纹理 //指定纹理数据和绑定对象关联glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, moon->sizeX, moon->sizeY, 0, GL_RGB,GL_UNSIGNED_BYTE, moon->data);//材质GLfloat moon_mat_diffuse[] = {0.5f, 0.5f, 0.5f, 1.0f}; //定义材质的漫反射光颜色，偏灰色GLfloat moon_mat_specular[] = {0.5f, 0.5f, 0.5f, 1.0f}; //定义材质的镜面反射光颜色，灰色GLfloat moon_mat_shininess = 100.0f; glMaterialfv(GL_FRONT, GL_DIFFUSE, moon_mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, moon_mat_specular);glMaterialf (GL_FRONT, GL_SHININESS, moon_mat_shininess); glRotatef(angle/30.0*360.0 - angle/360.0*360.0,0,1,0);glTranslatef(0.5,0,1);gltDrawSphere(0.2, 200, 200); //绘制球体glutSwapBuffers();}//画圆函数void gltDrawSphere(GLfloat fRadius, GLint iSlices, GLint iStacks){GLfloat drho = (GLfloat)(3.141592653589) / (GLfloat)iStacks;GLfloat dtheta = 2.0f *(GLfloat)(3.141592653589) / (GLfloat)iSlices;GLfloat ds = 1.0f / (GLfloat)iSlices;GLfloat dt = 1.0f / (GLfloat)iStacks;GLfloat t = 1.0f;GLfloat s = 0.0f;GLint i, j;for (i = 0; i < iStacks; i++){GLfloat rho = (GLfloat)i * drho;GLfloat srho = (GLfloat)(sin(rho));GLfloat crho = (GLfloat)(cos(rho));GLfloat srhodrho = (GLfloat)(sin(rho + drho));GLfloat crhodrho = (GLfloat)(cos(rho + drho));glBegin(GL_TRIANGLE_STRIP);s = 0.0f;for (j = 0; j <= iSlices; j++){GLfloat theta = (j == iSlices) ? 0.0f : j *dtheta;GLfloat stheta = (GLfloat)(-sin(theta));GLfloat ctheta = (GLfloat)(cos(theta));GLfloat x = stheta *srho;GLfloat y = ctheta *srho;GLfloat z = crho;glTexCoord2f(s, t);glNormal3f(x, y, z);glVertex3f(x * fRadius, y * fRadius, z * fRadius);x = stheta *srhodrho;y = ctheta *srhodrho;z = crhodrho;glTexCoord2f(s, t - dt);s += ds;glNormal3f(x, y, z);glVertex3f(x * fRadius, y * fRadius, z * fRadius);}glEnd();t -= dt;}}void texInit(){//启用二维纹理glEnable(GL_TEXTURE_2D);//创建3个纹理IDglGenTextures(1, &sunID);glGenTextures(1, &earthID);glGenTextures(1, &moonID);//载入纹理数据 将bmp文件 放在 .cpp/.c所在文件夹下char *filename = "sun.bmp";sun = auxDIBImageLoadA(filename);char * filename1 = "earth.bmp";earth = auxDIBImageLoadA(filename1);char *filename2 = "moon.bmp";moon = auxDIBImageLoadA(filename2);}void idle(){angle = angle + 1;if (angle > 360)angle = 0;glutPostRedisplay();}int main(int argc, char** argv){glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(1000, 600);glutCreateWindow("Texture");myinit(); //纹理初始化texInit();//纹理初始化glutDisplayFunc(display);glutIdleFunc(idle);glutKeyboardFunc(myKeyboard);glutMainLoop();return 0;}
