《高效学习OpenGL》 之 显示列表实例 glCallList(),glGenLists(),glNewList(),glEndList()

《高效学习OpenGL》 之 显示列表实例 glCallList(),glGenLists(),glNewList(),glEndList()

#include #include #include #include #define PI_ 3.14159265358979323846GLuint theTorus;/* Draw a torus */static void torus(int numc, int numt)//显示列表只能包含OpenGL函数{ int i, j, k; double s, t, x, y, z, twopi; twopi = 2 * PI_; for (i = 0; i < numc; i++) { glBegin(GL_QUAD_STRIP); for (j = 0; j <= numt; j++) { for (k = 1; k >= 0; k--) { s = (i + k) % numc + 0.5; t = j % numt; x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt); y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt); z = .1 * sin(s * twopi / numc); glVertex3f(x, y, z); } } glEnd(); }}/* Create display list with Torus and initialize state */static void init(void)//创建了一个绘制圆环面的显示列表{ theTorus = glGenLists (1);//glGenLists()唯一的标识一个显示列表 glNewList(theTorus, GL_COMPILE);//用于对显示列表进行定界。第一个参数是一个整形索引值，由glGenLists()指定 torus(8, 25); glEndList(); glShadeModel(GL_FLAT); glClearColor(0.0, 0.0, 0.0, 0.0);}/* Clear window and draw torus */void display(void){ glClear(GL_COLOR_BUFFER_BIT); glColor3f (1.0, 1.0, 1.0); glCallList(theTorus);//执行显示列表所存储的函数 glFlush();}/* Handle window resize */void reshape(int w, int h){ glViewport(0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);}/* Rotate about x-axis when "x" typed; rotate about y-axis when "y" typed; "i" returns torus to original view */void keyboard(unsigned char key, int x, int y){ switch (key) { case 'x': case 'X': glRotatef(30.,1.0,0.0,0.0); glutPostRedisplay();//使glutMainLoop()函数调用display()函数 break; case 'y': case 'Y': glRotatef(30.,0.0,1.0,0.0); glutPostRedisplay(); break; case 'i': case 'I': glLoadIdentity();//恢复初始模型矩阵 gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0); glutPostRedisplay(); break; case 27: exit(0); break; }}int main(int argc, char **argv){ glutInitWindowSize(200, 200); glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutCreateWindow(argv[0]); init(); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutDisplayFunc(display); glutMainLoop(); return 0;}

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