//A.16 带纹理立方体的旋转程序#include <stdlib.h>#include <GL/glut.h> GLfloat planes[]= {-1.0, 0.0, 1.0, 0.0};GLfloat planet[]= {0.0, -1.0, 0.0, 1.0};GLfloat vertices[][3] = {{-1.0,-1.0,-1.0}, {1.0,-1.0,-1.0},{1.0,1.0,-1.0}, {-1.0,1.0,-1.0}, {-1.0,-1.0,1.0}, {1.0,-1.0,1.0}, {1.0,1.0,1.0}, {-1.0,1.0,1.0}};GLfloat colors[][4] = {{0.0,0.0,0.0,0.5}, {1.0,0.0,0.0,0.5},{1.0,1.0,0.0,0.5}, {0.0,1.0,0.0,0.5}, {0.0,0.0,1.0,0.5}, {1.0,0.0,1.0,0.5}, {1.0,1.0,1.0,0.5}, {0.0,1.0,1.0,0.5}};void polygon(int a, int b, int c, int d){glBegin(GL_POLYGON);glColor4fv(colors[a]);glTexCoord2f(0.0,0.0); glVertex3fv(vertices[a]);glColor4fv(colors[b]);glTexCoord2f(0.0,1.0);glVertex3fv(vertices[b]);glColor4fv(colors[c]);glTexCoord2f(1.0,1.0); glVertex3fv(vertices[c]);glColor4fv(colors[d]);glTexCoord2f(1.0,0.0); glVertex3fv(vertices[d]);glEnd();}void colorcube(void){/* map vertices to faces */polygon(0,3,2,1);polygon(2,3,7,6);polygon(0,4,7,3);polygon(1,2,6,5);polygon(4,5,6,7);polygon(0,1,5,4);} static GLfloat theta[] = {0.0,0.0,0.0};static GLint axis = 2;void display(void){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glLoadIdentity();glRotatef(theta[0], 1.0, 0.0, 0.0);glRotatef(theta[1], 0.0, 1.0, 0.0);glRotatef(theta[2], 0.0, 0.0, 1.0);colorcube();glutSwapBuffers();}void spinCube(){theta[axis] += 2.0;if( theta[axis] > 360.0 ) theta[axis] -= 360.0;glutPostRedisplay();}void mouse(int btn, int state, int x, int y){if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) axis = 0;if(btn==GLUT_MIDDLE_BUTTON && state == GLUT_DOWN) axis = 1;if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN) axis = 2;}void myReshape(int w, int h){glViewport(0, 0, w, h);glMatrixMode(GL_PROJECTION);glLoadIdentity();if (w <= h)glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);else glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0);glMatrixMode(GL_MODELVIEW);}void key(unsigned char k, int x, int y){if(k == '1') glutIdleFunc(spinCube);if(k == '2') glutIdleFunc(NULL);if(k == 'q') exit(0);}void main(int argc, char **argv){GLubyte image[64][64][3];int i, j, r, c;for(i=0;i<64;i++){for(j=0;j<64;j++){c = ((((i&0x8)==0)^((j&0x8))==0))*255;image[i][j][0]= (GLubyte) c;image[i][j][1]= (GLubyte) c;image[i][j][2]= (GLubyte) c;}}glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(500, 500);glutCreateWindow("colorcube");glutReshapeFunc(myReshape);glutDisplayFunc(display);glutIdleFunc(spinCube);glutMouseFunc(mouse);glEnable(GL_DEPTH_TEST);glEnable(GL_TEXTURE_2D);glTexImage2D(GL_TEXTURE_2D,0,3,64,64,0,GL_RGB,GL_UNSIGNED_BYTE, image);glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glutKeyboardFunc(key);glClearColor(1.0,1.0,1.0,1.0);glutMainLoop();}
