OpenGL简单实例——实现立方体贴上不同纹理

#define GLUT_DISABLE_ATEXIT_HACK #if defined(__APPLE__) #include <GLUT/glut.h> #else #include <gl/glaux.h> #include "GL/glut.h" #endif const int width = 800; const int height = 600; GLfloat cubic_size = 1.0f; GLfloat xRotation = 0.0f, yRotation = 0.0f; const GLfloat rotSpeed = 64.0; bool bLButtonDown = false; GLint lastLx, lastLy; GLuint iTexture[]={0,0,0,0,0,0}; const GLfloat lightAmbient[] = {0.5f, 0.5f, 0.5f, 1.0f}; const GLfloat lightDiffuse[] = {1.0f, 1.0f, 1.0f, 1.0f}; const GLfloat lightSpecular[] = {1.0f, 1.0f, 1.0f, 1.0f}; const GLfloat lightPosition[] = {1.0f, 1.0f, 2.0f, 1.0f}; const GLfloat MatAmbient[] = {0.192250, 0.192250, 0.192250, 1.000000};//环境反射 const GLfloat MatDiffuse[] = {0.507540, 0.507540, 0.507540, 1.000000};//漫反射 const GLfloat MatSpecular[] = {0.508273, 0.508273, 0.508273, 1.000000};//镜面反射 const GLfloat MatShineness = 21.200001; // need to define if gl.h version < 1.2. #ifndef GL_LIGHT_MODEL_COLOR_CONTROL #define GL_LIGHT_MODEL_COLOR_CONTROL 0x81F8 #endif #ifndef GL_SEPARATE_SPECULAR_COLOR #define GL_SEPARATE_SPECULAR_COLOR 0x81FA #endif void init() { glEnable(GL_DEPTH_TEST); // Enables Depth Testing glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do // set the texture AUX_RGBImageRec *image[6]; image[0] = auxDIBImageLoad("woodbox.bmp"); image[1] = auxDIBImageLoad("pattern.bmp"); image[2] = auxDIBImageLoad("hrt-stone.bmp"); image[3] = auxDIBImageLoad("stone.bmp"); image[4] = auxDIBImageLoad("diamond_plate_texture.bmp"); image[5] = auxDIBImageLoad("gray.bmp"); for(int i=0; i<6;i++) { if (image[6] != NULL) { glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(6, &iTexture[i]); glBindTexture(GL_TEXTURE_2D, iTexture[i]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, image[i]->sizeX, image[i]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, image[i]->data); //glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); glEnable(GL_TEXTURE_2D); free(image[i]->data); free(image[i]); } } glEnable(GL_LIGHT0); glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient); glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse); glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpecular); glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); glMaterialfv(GL_FRONT, GL_AMBIENT, MatAmbient); glMaterialfv(GL_FRONT, GL_DIFFUSE, MatDiffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, MatSpecular); glMaterialf(GL_FRONT, GL_SHININESS, MatShineness); glEnable(GL_LIGHTING); glEnable(GL_NORMALIZE); glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR); } /* Draw the window - this is where all the GL actions are */ void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glRotatef(xRotation, 1.0f, 0.0f, 0.0f); glRotatef(yRotation, 0.0f, 1.0f, 0.0f); glBindTexture(GL_TEXTURE_2D, iTexture[0]); glBegin(GL_QUADS); // 1st quad (front) glColor3ub(255, 255, 0); glNormal3f(0.0f, 0.0f, 1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-cubic_size, cubic_size, cubic_size); glTexCoord2f(0.0f, 0.0f); glVertex3f(-cubic_size, -cubic_size, cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(cubic_size, -cubic_size, cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(cubic_size, cubic_size, cubic_size); glEnd(); glBindTexture(GL_TEXTURE_2D, iTexture[1]); glBegin(GL_QUADS); // 2nd quad (right) glColor3ub(0, 255, 255); glNormal3f(1.0f, 0.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(cubic_size, cubic_size, cubic_size); glTexCoord2f(0.0f, 1.0f); glVertex3f(cubic_size, -cubic_size, cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(cubic_size, cubic_size, -cubic_size); glEnd(); glBindTexture(GL_TEXTURE_2D, iTexture[2]); glBegin(GL_QUADS); // 3rd quad (back) glColor3ub(255, 0, 255); glNormal3f(0.0f, 0.0f, -1.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(cubic_size, cubic_size, -cubic_size); glTexCoord2f(0.0f, 1.0f); glVertex3f(cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(-cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(-cubic_size, cubic_size, -cubic_size); glEnd(); glBindTexture(GL_TEXTURE_2D, iTexture[3]); glBegin(GL_QUADS); // 4th quad (left) glColor3ub(0, 0, 255); glNormal3f(-1.0f, 0.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-cubic_size, cubic_size, -cubic_size); glTexCoord2f(0.0f, 1.0f); glVertex3f(-cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(-cubic_size, -cubic_size, cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(-cubic_size, cubic_size, cubic_size); glEnd(); glBindTexture(GL_TEXTURE_2D, iTexture[4]); glBegin(GL_QUADS); // 5th quad (bottom) glColor3ub(0, 255, 0); glNormal3f(0.0f, -1.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-cubic_size, -cubic_size, cubic_size); glTexCoord2f(0.0f, 1.0f); glVertex3f(-cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(cubic_size, -cubic_size, -cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(cubic_size, -cubic_size, cubic_size); glEnd(); glBindTexture(GL_TEXTURE_2D, iTexture[5]); glBegin(GL_QUADS); // 6th quad (top) glColor3ub(255, 0, 0); glNormal3f(0.0f, 1.0f, 0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(cubic_size, cubic_size, cubic_size); glTexCoord2f(0.0f, 1.0f); glVertex3f(cubic_size, cubic_size, -cubic_size); glTexCoord2f(1.0f, 1.0f); glVertex3f(-cubic_size, cubic_size, -cubic_size); glTexCoord2f(1.0f, 0.0f); glVertex3f(-cubic_size, cubic_size, cubic_size); glEnd(); glPopMatrix(); glFlush(); } void reshape(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); GLdouble aspect = (GLdouble) w / (GLdouble) h; glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(22.5, aspect, 0.1, 100.0); } void mouse(int button, int state, int x, int y) { switch (button) { case GLUT_LEFT_BUTTON: lastLx = x; lastLy = y; bLButtonDown = state == GLUT_DOWN; break; case GLUT_MIDDLE_BUTTON: break; case GLUT_RIGHT_BUTTON: break; default: break; } } void motion(int x, int y) { if (bLButtonDown) { yRotation -= (GLfloat) (lastLx - x) / rotSpeed; xRotation -= (GLfloat) (lastLy - y) / rotSpeed; } glutPostRedisplay(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA); glutInitWindowSize((int) width, (int) height); glutCreateWindow(argv[0]); init(); glutReshapeFunc(reshape); glutDisplayFunc(display); glutMouseFunc(mouse); glutMotionFunc(motion); glutMainLoop(); return 0; }