/********************************************************************* * Lighting Demo * Copyright (C) 1999 * By Nathan Buggia * * File: main.c * Date: 12.20.1999 * Auth: Nathan Buggia * * Creates a simple scene in which the users can adjust all of the * lighting values. ********************************************************************/ #include "stdio.h" #include "string.h" #include "stdlib.h" #include int RotateX = -63; // for mouse rotation of the entire scene int RotateY = 30; int PrevX = 0; int PrevY = 0; int MouseDown = GL_FALSE; int WindowWidth = 400; int WindowHeight = 410; float incrmt = 0.1; float light_ambient[] = {0.0, 0.5, 0.0, 1.0}; float light_diffuse[] = {0.5, 0.5, 0.5, 0.6}; float light_specular[] = {1.0, 1.0, 1.0, 1.0}; float light_position[] = {-3.0, 2.0, 1.0, 0.0}; float ambient[] = {0.3f, 0.3f, 0.3f, 0.5f}; float diffuse[] = {0.5, 0.5, 0.5, 0.5}; float specular[] = {0.5, 0.5, 0.5, 0.5}; float emission[] = {0.0, 0.0, 0.0, 1.0}; float shiness[] = {50.0}; /*| Prints the message to the screen. *| *| IN: msg - The message to print *| x - x value to print the message *| y - y value to print the message */ void WriteMessage(char* msg, int x, int y){ unsigned int i; glRasterPos2i(x, y); for (i = 0; i < strlen(msg); i++) glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, msg[i]); } /*| Called when the window is created and reshaped. Resets the viewport size *| to the real size of the window. *| *| IN: width - new width of the window *| height - new height of the window */ void Reshape(GLint width, GLint height){ WindowWidth = width; WindowHeight = height; glViewport(0, 0, width, height); glutPostRedisplay(); } /*| Called when the window needs to be drawn or redrawn. Draws the scene *| and all of the lighting parameters to the screen. *| */ void Display(void){ int i; char dispText[32]; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); glLightfv(GL_LIGHT0, GL_POSITION, light_position); glMaterialfv(GL_FRONT, GL_EMISSION, emission ); glMaterialfv(GL_FRONT, GL_AMBIENT, ambient); glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse ); glMaterialfv(GL_FRONT, GL_SPECULAR, specular ); glMaterialfv(GL_FRONT, GL_SHININESS, shiness ); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); glEnable(GL_COLOR_MATERIAL); // clear our matricies glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glPushMatrix(); glOrtho(-10.0, 10.0, -10.0, 10.0, -15.0, 15.0); glTranslatef(0.0, -2, 0.0); glScalef(2, 2, 2); glRotatef(-RotateX, 0.0, 1.0, 0.0); glRotatef(RotateY, 1.0, 0.0, 0.0); // draw axis glColor3f(1.0, 1.0, 1.0); glBegin(GL_LINES); glVertex3i( -10.0, 0, 0 ); // x-axis glVertex3i( 10.0, 0, 0 ); glVertex3i( 0, -5.0, 0 ); // y-axis glVertex3i( 0, 5.0, 0 ); glVertex3i( 0, 0, -10.0 ); // z-axis glVertex3i( 0, 0, 10.0 ); // grid on the x/z plane for(i = 0; i < 10; i++){ glVertex3i(-10, 0, i); glVertex3i(10, 0, i); glVertex3i(-10, 0, -i); glVertex3i(10, 0, -i); //other way glVertex3i(i, 0, -10); glVertex3i(i, 0, 10); glVertex3i(-i, 0, -10); glVertex3i(-i, 0, 10); } glEnd(); // CONE glPushMatrix(); glColor3f(1.0, 0.0, 0.0); glTranslatef( 0, 0, 3); glRotatef(-90.0, 1.0, 0.0, 0.0); glutSolidCone(2.0, 4.0, 15, 15); glPopMatrix(); // CUBE glPushMatrix(); glColor3f(0.0, 1.0, 0.0); glTranslatef( -2, 1.5, -3); glutSolidCube(3.0); glPopMatrix(); // SPHERE glPushMatrix(); glColor3f(0.0, 0.0, 1.0); glTranslatef(2, 1.5, -3); glutSolidSphere(2.0, 30.0, 30.0); glPopMatrix(); // light source glPushMatrix(); glDisable(GL_LIGHTING); glDisable(GL_LIGHT0); glColor3f(1.0, 1.0, 1.0); glTranslatef(light_position[0], light_position[1], light_position[2]); glutWireSphere(0.20, 7.0, 7.0); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glPopMatrix(); glPopMatrix(); // draw GUI if(!MouseDown){ glPushMatrix(); glDisable(GL_LIGHTING); glDisable(GL_LIGHT0); glDisable(GL_COLOR_MATERIAL); glOrtho(0, WindowWidth, WindowHeight, 0, -15, 15); glTranslatef(0.0, 0.0, 14); // draw lighting info WriteMessage("Lighting", 10, 320); sprintf(dispText, "ambient{%4.2f, %4.2f, %4.2f, %4.2f}", light_ambient[0], light_ambient[1], light_ambient[2], light_ambient[3]); WriteMessage(dispText, 10, 340); sprintf(dispText, "diffuse{%4.2f, %4.2f, %4.2f, %4.2f}", light_diffuse[0], light_diffuse[1], light_diffuse[2], light_diffuse[3]); WriteMessage(dispText, 10, 355); sprintf(dispText, "specular{%4.2f, %4.2f, %4.2f, %4.2f}", light_specular[0], light_specular[1], light_specular[2], light_specular[3]); WriteMessage(dispText, 10, 370); sprintf(dispText, "position{%4.2f, %4.2f, %4.2f, %4.2f}", light_position[0], light_position[1], light_position[2], light_position[3]); WriteMessage(dispText, 10, 385); // material info // draw lighting info WriteMessage("Material", 250, 320); sprintf(dispText, "ambient{%4.2f, %4.2f, %4.2f, %4.2f}", light_ambient[0], light_ambient[1], light_ambient[2], light_ambient[3]); WriteMessage("Lighting", 10, 320); sprintf(dispText, "ambient{%4.2f, %4.2f, %4.2f, %4.2f}", ambient[0], ambient[1], ambient[2], ambient[3]); WriteMessage(dispText, 250, 340); sprintf(dispText, "diffuse{%4.2f, %4.2f, %4.2f, %4.2f}", diffuse[0], diffuse[1], diffuse[2], diffuse[3]); WriteMessage(dispText, 250, 355); sprintf(dispText, "specular{%4.2f, %4.2f, %4.2f, %4.2f}", specular[0], specular[1], specular[2], specular[3]); WriteMessage(dispText, 250, 370); sprintf(dispText, "emission{%4.2f, %4.2f, %4.2f, %4.2f}", emission[0], emission[1], emission[2], emission[3]); WriteMessage(dispText, 250, 385); sprintf(dispText, "shiness{%4.2f}", shiness[0]); WriteMessage(dispText, 250, 400); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_COLOR_MATERIAL); glPopMatrix(); } glutSwapBuffers(); } /*| Called when the cursor is moving in the window. Used to control the drag *| scene rotation. *| */ void DisplayMouseMotion(int x, int y){ int dx = PrevX - x; int dy = y - PrevY; if( MouseDown ) { RotateX += (dx * 180.0f) / 600.0f; RotateY += (dy * 180.0f) / 600.0f; PrevX = x; PrevY = y; glutPostRedisplay(); } } /*| Called when the mouse is clicked. Used to control the click-and-drag *| scene rotation. */ void DisplayMouseClick(int button, int state, int x, int y){ if( state == GLUT_DOWN ){ if(button == GLUT_LEFT_BUTTON){ PrevX = x; PrevY = y; MouseDown = GL_TRUE; DisplayMouseMotion(x,y); // so it moves when we click down. } } else if( state == GLUT_UP ){ glutPostRedisplay(); MouseDown = GL_FALSE; } } /*| Handles all keyboard input. Used to adjust all lighting values. *| *| IN: key - the key the user pressed. *| x - x coord of the mouse when the key was pressed. *| y - y coord of mouse when key was pressed. */ void Keyboard(unsigned char key, GLint x, GLint y){ switch(key){ // light ambient case '1': // RED ++ light_ambient[0] += incrmt; if(light_ambient[0] > 1.0) light_ambient[0] = 1.0f; break; case '!': // RED -- light_ambient[0] -= incrmt; if(light_ambient[0] < -1.0) light_ambient[0] = -1.0f; break; case '2': // GREEN ++ light_ambient[1] += incrmt; if(light_ambient[1] > 1.0) light_ambient[1] = 1.0f; break; case '@': // GREEN -- light_ambient[1] -= incrmt; if(light_ambient[1] < -1.0) light_ambient[1] = -1.0f; break; case '3': // BLUE ++ light_ambient[2] += incrmt; if(light_ambient[2] > 1.0) light_ambient[2] = 1.0f; break; case '#': // BLUE -- light_ambient[2] -= incrmt; if(light_ambient[2] < -1.0) light_ambient[2] = -1.0f; break; case '4': // ALPHA ++ light_ambient[3] += incrmt; if(light_ambient[3] > 1.0) light_ambient[3] = 1.0f; break; case '$': // ALPHA -- light_ambient[3] -= incrmt; if(light_ambient[3] < -1.0) light_ambient[3] = -1.0f; break; // light diffuse case 'q': // RED ++ light_diffuse[0] += incrmt; if(light_diffuse[0] > 1.0) light_diffuse[0] = 1.0f; break; case 'Q': // RED -- light_diffuse[0] -= incrmt; if(light_diffuse[0] < -1.0) light_diffuse[0] = -1.0f; break; case 'w': // GREEN ++ light_diffuse[1] += incrmt; if(light_diffuse[1] > 1.0) light_diffuse[1] = 1.0f; break; case 'W': // GREEN -- light_diffuse[1] -= incrmt; if(light_diffuse[1] < -1.0) light_diffuse[1] = -1.0f; break; case 'e': // BLUE ++ light_diffuse[2] += incrmt; if(light_diffuse[2] > 1.0) light_diffuse[2] = 1.0f; break; case 'E': // BLUE -- light_diffuse[2] -= incrmt; if(light_diffuse[2] < -1.0) light_diffuse[2] = -1.0f; break; case 'r': // ALPHA ++ light_diffuse[3] += incrmt; if(light_diffuse[3] > 1.0) light_diffuse[3] = 1.0f; break; case 'R': // ALPHA -- light_diffuse[3] -= incrmt; if(light_diffuse[3] < -1.0) light_diffuse[3] = -1.0f; break; // light specular case 'a': // RED ++ light_specular[0] += incrmt; if(light_specular[0] > 1.0) light_specular[0] = 1.0f; break; case 'A': // RED -- light_specular[0] -= incrmt; if(light_specular[0] < -1.0) light_specular[0] = -1.0f; break; case 's': // GREEN ++ light_specular[1] += incrmt; if(light_specular[1] > 1.0) light_specular[1] = 1.0f; break; case 'S': // GREEN -- light_specular[1] -= incrmt; if(light_specular[1] < -1.0) light_specular[1] = -1.0f; break; case 'd': // BLUE ++ light_specular[2] += incrmt; if(light_specular[2] > 1.0) light_specular[2] = 1.0f; break; case 'D': // BLUE -- light_specular[2] -= incrmt; if(light_specular[2] < -1.0) light_specular[2] = -1.0f; break; case 'f': // ALPHA ++ light_specular[3] += incrmt; if(light_specular[3] > 1.0) light_specular[3] = 1.0f; break; case 'F': // ALPHA -- light_specular[3] -= incrmt; if(light_specular[3] < -1.0) light_specular[3] = -1.0f; break; // light position case 'z': // X ++ light_position[0] += 1; break; case 'Z': // X -- light_position[0] -= 1; break; case 'x': // Y ++ light_position[1] += 1; break; case 'X': // Y -- light_position[1] -= 1; break; case 'c': // Z ++ light_position[2] += 1; break; case 'C': // Z -- light_position[2] -= 1; break; case 'v': // W ++ light_position[3] += incrmt; if(light_position[3] > 1.0) light_position[3] = 1.0f; break; case 'V': // W -- light_position[3] -= incrmt; if(light_position[3] < -1.0) light_position[3] = -1.0f; break; // material ambient case '7': // RED ++ ambient[0] += incrmt; if(ambient[0] > 1.0) ambient[0] = 1.0f; break; case '&': // RED -- ambient[0] -= incrmt; if(ambient[0] < -1.0) ambient[0] = -1.0f; break; case '8': // GREEN ++ ambient[1] += incrmt; if(ambient[1] > 1.0) ambient[1] = 1.0f; break; case '*': // GREEN -- ambient[1] -= incrmt; if(ambient[1] < -1.0) ambient[1] = -1.0f; break; case '9': // BLUE ++ ambient[2] += incrmt; if(ambient[2] > 1.0) ambient[2] = 1.0f; break; case '(': // BLUE -- ambient[2] -= incrmt; if(ambient[2] < -1.0) ambient[2] = -1.0f; break; case '0': // ALPHA ++ ambient[3] += incrmt; if(ambient[3] > 1.0) ambient[3] = 1.0f; break; case ')': // ALPHA -- ambient[3] -= incrmt; if(ambient[3] < -1.0) ambient[3] = -1.0f; break; // material diffuse case 'u': // RED ++ diffuse[0] += incrmt; if(diffuse[0] > 1.0) diffuse[0] = 1.0f; break; case 'U': // RED -- diffuse[0] -= incrmt; if(diffuse[0] < -1.0) diffuse[0] = -1.0f; break; case 'i': // GREEN ++ diffuse[1] += incrmt; if(diffuse[1] > 1.0) diffuse[1] = 1.0f; break; case 'I': // GREEN -- diffuse[1] -= incrmt; if(diffuse[1] < -1.0) diffuse[1] = -1.0f; break; case 'o': // BLUE ++ diffuse[2] += incrmt; if(diffuse[2] > 1.0) diffuse[2] = 1.0f; break; case 'O': // BLUE -- diffuse[2] -= incrmt; if(diffuse[2] < -1.0) diffuse[2] = -1.0f; break; case 'p': // ALPHA ++ diffuse[3] += incrmt; if(diffuse[3] > 1.0) diffuse[3] = 1.0f; break; case 'P': // ALPHA -- diffuse[3] -= incrmt; if(diffuse[3] < -1.0) diffuse[3] = -1.0f; break; // material specular case 'j': // RED ++ specular[0] += incrmt; if(specular[0] > 1.0) specular[0] = 1.0f; break; case 'J': // RED -- specular[0] -= incrmt; if(specular[0] < -1.0) specular[0] = -1.0f; break; case 'k': // GREEN ++ specular[1] += incrmt; if(specular[1] > 1.0) specular[1] = 1.0f; break; case 'K': // GREEN -- specular[1] -= incrmt; if(specular[1] < -1.0) specular[1] = -1.0f; break; case 'l': // BLUE ++ specular[2] += incrmt; if(specular[2] > 1.0) specular[2] = 1.0f; break; case 'L': // BLUE -- specular[2] -= incrmt; if(specular[2] < -1.0) specular[2] = -1.0f; break; case ';': // ALPHA ++ specular[3] += incrmt; if(specular[3] > 1.0) specular[3] = 1.0f; break; case ':': // ALPHA -- specular[3] -= incrmt; if(specular[3] < -1.0) specular[3] = -1.0f; break; // material emission case 'm': // RED ++ emission[0] += incrmt; if(emission[0] > 1.0) emission[0] = 1.0f; break; case 'M': // RED -- emission[0] -= incrmt; if(emission[0] < -1.0) emission[0] = -1.0f; break; case ',': // GREEN ++ emission[1] += incrmt; if(emission[1] > 1.0) emission[1] = 1.0f; break; case '<': // GREEN -- emission[1] -= incrmt; if(emission[1] < -1.0) emission[1] = -1.0f; break; case '.': // BLUE ++ emission[2] += incrmt; if(emission[2] > 1.0) emission[2] = 1.0f; break; case '>': // BLUE -- emission[2] -= incrmt; if(emission[2] < -1.0) emission[2] = -1.0f; break; case '/': // ALPHA ++ emission[3] += incrmt; if(emission[3] > 1.0) emission[3] = 1.0f; break; case '?': // ALPHA -- emission[3] -= incrmt; if(emission[3] < -1.0) emission[3] = -1.0f; break; // material shiness case '=': shiness[0] += 2; if(shiness[0] > 100.0f) shiness[0] = 100.0f; break; case '+': shiness[0] -= 2; if(shiness[0] < 0.0f) shiness[0] = 0.0f; break; case '-': glShadeModel(GL_SMOOTH); break; case '_': glShadeModel(GL_FLAT); break; case 27: exit(-1); break; default: break; } glutPostRedisplay(); } /*| Hanldes all input from the popup menu */ void HandleMenu(int choice){ // NOT IMPLEMENTED switch(choice){ default: // this should never happen. printf("Unknown menu command.\n"); break; } } /*| Create and initialize the popup menus. */ void MenuInit(void){ int menu; // NOT IMPLIMENTED } /*| Set opengl options for lighting. */ void Init(void){ int i; // clear color is black, and simple block shading. glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_SMOOTH); // used to make sure objects closer to the user are draw last glEnable(GL_DEPTH_TEST); glEnable(GL_NORMALIZE); } /*| Prints instructions and copyright notices onto the console when *| the application is launched. */ void PrintUsage(void){ printf("Lighting Demo v1.0\n"); printf("Copyright(C) 1999, by Nathan Buggia.\n"); printf("All rights reserved.\n\n"); printf("All of the lighting values are controlled by the keyboard. In\n"); printf("general, a key increses the value, and shift+key decreases the\n"); printf("value. The lighting values are controlled by the left side of\n"); printf("the keyboard and the material values are controlled by the\n"); printf("right side of the keyboard in the order they appear on the\n"); printf("screen. For example, the the {'1', '2', '3', '4'} keys will\n"); printf("increase the Red, Blue, Green and Alpha values of the abient\n"); printf("value of the light source. Also the {'m','<','>','/'} keys will\n"); printf("increase the respective values of the material emmision.\n"); printf("\n"); printf("Finally, the '=' and '+' keys will adjust the shinniness and\n"); printf("the '-' and '_' keys will toggle flat or smooth shading.\n"); printf("\n"); printf("Press ESC to quit\n"); } /*| ** MAIN ** */ int main(int argc, char* argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(WindowWidth, WindowHeight); glutInitWindowPosition(5, 5); glutCreateWindow("Lighting Demo"); Init(); MenuInit(); PrintUsage(); glutDisplayFunc(&Display); glutKeyboardFunc(&Keyboard); glutReshapeFunc(&Reshape); glutMouseFunc(&DisplayMouseClick); glutMotionFunc(&DisplayMouseMotion); glutMainLoop(); return 0; }