OpenGL: 雾化效果

来源：互联网发布：b站和知乎是什么意思编辑：程序博客网时间：2024/06/03 00:39
#include <gl/glut.h>#pragma comment(lib, "glut32.lib")
#define MODE_NONE 0#define MODE_LINEAR 1#define MODE_EXP 2#define MODE_EXP2 3
GLint fogMode;
void Initialization(void){ GLfloat position[] = {0.5f, 0.5f, 3.0f, 0.0f}; glEnable(GL_DEPTH_TEST); glLightfv(GL_LIGHT0,GL_POSITION, position); //设置光源位置
 glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); {  //为材质指定对光源的反射  GLfloat ambLight[3] = {0.17f, 0.11f, 0.11f};  glMaterialfv(GL_FRONT, GL_AMBIENT, ambLight);   GLfloat difLight[3] = {0.61f, 0.24f, 0.24f};  glMaterialfv(GL_FRONT, GL_DIFFUSE, difLight);  GLfloat speLight[3] = {0.73f, 0.63f, 0.63f};  glMaterialfv(GL_FRONT, GL_SPECULAR, speLight);  //设置反光系数  glMaterialf(GL_FRONT, GL_SHININESS, 100.0f);   }
 glEnable(GL_FOG);//启用雾功能
 GLfloat fogColor[4] = {0.5f, 0.5f, 0.5f, 1.0f}; fogMode = GL_LINEAR;                     glFogi(GL_FOG_MODE, fogMode); glFogfv(GL_FOG_COLOR, fogColor); glFogf(GL_FOG_DENSITY, 0.35f); glHint(GL_FOG_HINT, GL_DONT_CARE); glFogf(GL_FOG_START, 1.0f); glFogf(GL_FOG_END, 5.0f);
 glClearColor(fogColor[0], fogColor[1], fogColor[2], fogColor[3]);//背景色}
void DrawTeapot(GLfloat x, GLfloat y, GLfloat z){ glPushMatrix(); {  glTranslatef(x, y, z);  glutSolidTeapot(0.8f); } glPopMatrix();}
void OnDisplay(void){ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 DrawTeapot(-2.0f, -1.0f, -1.0f); DrawTeapot(-1.0f, -0.5f, -2.0f); DrawTeapot(0.0f, 0.0f, -3.0f); DrawTeapot(1.0f, 0.5f, -4.0f); DrawTeapot(2.0f, 1.0f, -5.0f);
 glFlush();}
void OnReShape(int w,int h){ glViewport(0, 0, (GLsizei)w, (GLsizei)h);
 glMatrixMode(GL_PROJECTION); //将当前矩阵指定为投影模式 glLoadIdentity();
 GLfloat aspect = GLfloat(h) / GLfloat(w);
 if(w <= h) {  glOrtho(-2.5f, 2.5f, -2.5f * aspect, 2.5f * aspect, -10.0f, 10.0f);//三维正交投影 } else {  glOrtho(-2.5f / aspect, 2.5f / aspect, -2.5f, 2.5f, -10.0f, 10.0f); } glMatrixMode(GL_MODELVIEW); glLoadIdentity();}
void CreateMenu(void){ glutAddMenuEntry("线性", MODE_LINEAR); glutAddMenuEntry("指数", MODE_EXP); glutAddMenuEntry("指数2", MODE_EXP2); glutAddMenuEntry("无雾", MODE_NONE);
 glutAttachMenu(GLUT_RIGHT_BUTTON);}
void OnMenu(int value){ switch (value) { case MODE_LINEAR:  fogMode = GL_LINEAR;  break;
 case MODE_EXP:  fogMode = GL_EXP;  break;
 case MODE_EXP2:  fogMode = GL_EXP2; }
 glFogi(GL_FOG_MODE, fogMode); if (value == MODE_NONE) {  glDisable(GL_FOG); } else {  glEnable(GL_FOG); } glutPostRedisplay();}void main(int argc,char* argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(600, 600); glutCreateWindow("OpenGL雾化");
 glutReshapeFunc(OnReShape); glutDisplayFunc(OnDisplay); glutCreateMenu(OnMenu);
 CreateMenu(); Initialization();
 glutMainLoop();}
运行效果如下:
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