#include "glCanvas.h" // Included files for OpenGL Rendering #include #include #include "ifs.h" #include "argparser.h" #include "camera.h" // ======================================================== // static variables of GLCanvas class int GLCanvas::mouseButton; int GLCanvas::mouseX; int GLCanvas::mouseY; int GLCanvas::display_list_index; ArgParser* GLCanvas::args; IFS* GLCanvas::ifs; Camera* GLCanvas::camera; // ======================================================== // Initialize all appropriate OpenGL variables, set // callback functions, and start the main event loop. // This function will not return but can be terminated // by calling 'exit(0)' // ======================================================== void GLCanvas::initialize(ArgParser *_args, IFS *_ifs) { args = _args; ifs = _ifs; camera = new PerspectiveCamera(Vec3f(0,0,15), Vec3f(0,0,-1), Vec3f(0,1,0), 20 * M_PI/180.0); // Set global lighting parameters glEnable(GL_LIGHTING); glShadeModel(GL_SMOOTH); // Set window parameters glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB); glEnable(GL_DEPTH_TEST); glutInitWindowSize(args->width, args->height); glutInitWindowPosition(100,100); glutCreateWindow("OpenGL Viewer"); glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE); glEnable(GL_NORMALIZE); // Ambient light Vec3f ambColor = Vec3f(0.2,0.2,0.2); GLfloat ambArr[] = { ambColor.x(), ambColor.y(), ambColor.z(), 1.0 }; glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambArr); glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); glCullFace(GL_BACK); glDisable(GL_CULL_FACE); // Initialize callback functions glutMouseFunc(mouse); glutMotionFunc(motion); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); // ========================================================= // A display list is used for efficiency display_list_index = glGenLists(1); glNewList(display_list_index, GL_COMPILE); ifs->Paint(); glEndList(); // Enter the main rendering loop glutMainLoop(); } // ======================================================== // ======================================================== void GLCanvas::CubePaint() { glBegin (GL_QUADS); // front - red glNormal3f(0,0,1.0); glColor3f(1.0,0.0,0.0); glVertex3f(0.0,0.0,1.0); glVertex3f(1.0,0.0,1.0); glVertex3f(1.0,1.0,1.0); glVertex3f(0.0,1.0,1.0); // top - green glNormal3f(0,1.0,0); glColor3f(0.0,1.0,0.0); glVertex3f(0.0,1.0,0.0); glVertex3f(0.0,1.0,1.0); glVertex3f(1.0,1.0,1.0); glVertex3f(1.0,1.0,0.0); // right - purple glNormal3f(1.0,0,0); glColor3f(1.0,0.0,1.0); glVertex3f(1.0,0.0,0.0); glVertex3f(1.0,1.0,0.0); glVertex3f(1.0,1.0,1.0); glVertex3f(1.0,0.0,1.0); // back - cyan glNormal3f(0,0,-1.0); glColor3f(0.0,1.0,1.0); glVertex3f(0.0,0.0,0.0); glVertex3f(0.0,1.0,0.0); glVertex3f(1.0,1.0,0.0); glVertex3f(1.0,0.0,0.0); // bottom - yellow glNormal3f(0,-1.0,0); glColor3f(1.0,1.0,0.0); glVertex3f(0.0,0.0,0.0); glVertex3f(1.0,0.0,0.0); glVertex3f(1.0,0.0,1.0); glVertex3f(0.0,0.0,1.0); // left - blue glNormal3f(-1.0,0,0); glColor3f(0.0,0.0,1.0); glVertex3f(0.0,0.0,0.0); glVertex3f(0.0,0.0,1.0); glVertex3f(0.0,1.0,1.0); glVertex3f(0.0,1.0,0.0); glEnd(); } void GLCanvas::InitLight() { // Set the last component of the position to 0 to indicate // a directional light source GLfloat position[4] = { 30,30,100, 1}; GLfloat diffuse[4] = { 0.75,0.75,0.75,1}; GLfloat specular[4] = { 0,0,0,1}; GLfloat ambient[4] = { 0.2, 0.2, 0.2, 1.0 }; GLfloat zero[4] = {0,0,0,0}; glLightfv(GL_LIGHT1, GL_POSITION, position); glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse); glLightfv(GL_LIGHT1, GL_SPECULAR, specular); glLightfv(GL_LIGHT1, GL_AMBIENT, zero); glEnable(GL_LIGHT1); glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); glEnable(GL_COLOR_MATERIAL); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient); GLfloat spec_mat[4] = {1,1,1,1}; float glexponent = 30; glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, &glexponent); glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, spec_mat); glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE); float back_color[] = { 0.3,0.3,0.3,1}; glMaterialfv(GL_BACK, GL_AMBIENT_AND_DIFFUSE, back_color); glEnable(GL_LIGHT1); } void GLCanvas::display(void) { // Clear the display buffer, set it to the background color glClearColor(1,1,1,0); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Set the camera parameters glMatrixMode(GL_MODELVIEW); glLoadIdentity(); InitLight(); // light will be a headlamp! camera->glPlaceCamera(); glEnable(GL_LIGHTING); glEnable(GL_DEPTH_TEST); glScalef(2.0,2.0,2.0); glTranslatef(-0.5,-0.5,-0.5); glCallList(display_list_index); // Swap the back buffer with the front buffer to display // the scene glutSwapBuffers(); } // ======================================================== // Callback function for window resize // ======================================================== void GLCanvas::reshape(int w, int h) { // Set the OpenGL viewport to fill the entire window glViewport(0, 0, (GLsizei)w, (GLsizei)h); // Set the camera parameters to reflect the changes camera->glInit(w, h); args->width = w; args->height = h; } // ======================================================== // Callback function for mouse click or release // ======================================================== void GLCanvas::mouse(int button, int state, int x, int y) { // Save the current state of the mouse. This will be // used by the 'motion' function mouseButton = button; mouseX = x; mouseY = y; } // ======================================================== // Callback function for mouse drag // ======================================================== void GLCanvas::motion(int x, int y) { // Left button = rotation // (rotate camera around the up and horizontal vectors) if (mouseButton == GLUT_LEFT_BUTTON) { camera->rotateCamera(0.005*(mouseX-x), 0.005*(mouseY-y)); mouseX = x; mouseY = y; } // Middle button = translation // (move camera perpendicular to the direction vector) else if (mouseButton == GLUT_MIDDLE_BUTTON) { camera->truckCamera((mouseX-x)*0.05, (y-mouseY)*0.05); mouseX = x; mouseY = y; } // Right button = zoom // (move camera along the direction vector) else if (mouseButton == GLUT_RIGHT_BUTTON) { camera->dollyCamera((x-mouseX)*0.05); mouseX = x; mouseY = y; } // Redraw the scene with the new camera parameters glutPostRedisplay(); } // ======================================================== // Callback function for keyboard events // ======================================================== void GLCanvas::keyboard(unsigned char key, int x, int y) { switch (key) { case 'q': case 'Q': exit(0); break; default: printf("UNKNOWN KEYBOARD INPUT '%c'\n", key); } } // ======================================================== // ========================================================