// // This code was created by Jeff Molofee '99 // // If you've found this code useful, please let me know. // // Visit me at www.demonews.com/hosted/nehe // /**************************************************************/ // This code was ported to MacOS by Tony Parker. // I'd also appreciate it if you could drop me a line if you found // this code useful. // // Tony Parker - asp@usc.edu // // Have a nice day. // Mac OS X Conversion by Chad Armstrong (chad@edenwaith.com) // 1. Add these three Frameworks to the External Frameworks folder // Foundation // GLUT // OpenGL // 2. Change the header to // 3. Comment out the and headers #include // Header File For Standard C++ Input / Output #include // Header File For Standard C Input / Output #include // Header File For Variable Argument Routines #include // Header File For String Management #include //#include // Header File For The OpenGL32 Library //#include // Header File For The GLu32 Library #include // Header File For The GLUT Library #include // Constants ----------------------------------------------------------------- #define kWindowWidth 512 #define kWindowHeight 256 #define PYRAMID 100 #define CUBE 101 #define TORUS 102 int window; // Function Prototypes ------------------------------------------------------- GLvoid InitGL(GLvoid); GLvoid drawShapes(GLenum mode); GLvoid display(GLvoid); GLvoid ReSizeGLScene(int Width, int Height); GLvoid Idle(GLvoid); void keyboard(unsigned char key, int x, int y); void mouse_function(int button, int state, int x, int y); int retrieveObjectID(int x, int y); // Global Variables ---------------------------------------------------------- GLfloat rtri; // Angle For The Triangle GLfloat rquad; // Angle For The Quad int objectID; // Main ---------------------------------------------------------------------- int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(kWindowWidth, kWindowHeight); glutInitWindowPosition (100, 100); window = glutCreateWindow (argv[0]); InitGL(); glutDisplayFunc(display); glutReshapeFunc(ReSizeGLScene); glutIdleFunc(Idle); glutKeyboardFunc(keyboard); glutMouseFunc(mouse_function); glutMainLoop(); rtri = 0; rquad = 0; return 0; } // InitGL -------------------------------------------------------------------- GLvoid InitGL(GLvoid) { objectID = 0; // this isn't OpenGL related per se, but it needs to be initialized glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black glClearDepth(1.0); // Enables Clearing Of The Depth Buffer glDepthFunc(GL_LESS); // The Type Of Depth Test To Do glEnable(GL_DEPTH_TEST); // Enables Depth Testing glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading glMatrixMode(GL_PROJECTION); glLoadIdentity(); // Reset The Projection Matrix gluPerspective(45.0f, (GLfloat) kWindowWidth / (GLfloat) kWindowHeight, 0.1f, 100.0f); // Calculate The Aspect Ratio Of The Window glMatrixMode(GL_MODELVIEW); } // Idle ---------------------------------------------------------------------- GLvoid Idle(GLvoid) { rtri += 0.2f; // Increase The Rotation Variable For The Triangle rquad -= 0.15f; // Decrease The Rotation Variable For The Quad glutPostRedisplay(); } // drawShapes --------------------------------------------------------------- GLvoid drawShapes(GLenum mode) { // these two lines were instrumental in getting the picking to work! // two lines! That's it! glInitNames(); glPushName(0); glLoadIdentity(); // Reset The View glTranslatef(-1.5f,0.0f,-6.0f); // Move Left And Into The Screen glRotatef(rtri,0.0f,1.0f,0.0f); // Rotate The Pyramid On It's Y Axis if (GL_SELECT == mode) { glLoadName(PYRAMID); } glBegin(GL_POLYGON); // Start Drawing The Pyramid glColor3f(1.0f,0.0f,0.0f); // Red glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front) glColor3f(0.0f,1.0f,0.0f); // Green glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front) glColor3f(0.0f,0.0f,1.0f); // Blue glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front) glColor3f(1.0f,0.0f,0.0f); // Red glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right) glColor3f(0.0f,0.0f,1.0f); // Blue glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right) glColor3f(0.0f,1.0f,0.0f); // Green glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right) glColor3f(1.0f,0.0f,0.0f); // Red glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back) glColor3f(0.0f,1.0f,0.0f); // Green glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back) glColor3f(0.0f,0.0f,1.0f); // Blue glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back) glColor3f(1.0f,0.0f,0.0f); // Red glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left) glColor3f(0.0f,0.0f,1.0f); // Blue glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left) glColor3f(0.0f,1.0f,0.0f); // Green glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left) glEnd(); // Done Drawing Pyramid glLoadIdentity(); glTranslatef(1.5f,0.0f,-7.0f); // Move Right And Into The Screen glRotatef(rquad,1.0f,1.0f,1.0f); // Rotate The Cube On X, Y & Z if (GL_SELECT == mode) { glLoadName(CUBE); } glBegin(GL_QUADS); // Start Drawing The Cube glColor3f(0.0f,1.0f,0.0f); // Set The Color To Blue glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top) glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top) glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top) glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom) glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom) glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front) glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front) glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front) glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front) glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right Of The Quad (Back) glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left Of The Quad (Back) glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left Of The Quad (Back) glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right Of The Quad (Back) glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left) glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left) glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left) glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right) glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right) glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right) glEnd(); // Done Drawing The Quad glLoadIdentity(); glTranslatef(0.5f,0.0f,-7.0f); glRotatef(rquad,1.0f,0.0f,0.0f); if (GL_SELECT == mode) { glLoadName(TORUS); } glColor3f(0.0f,0.0f,1.0f); glutSolidTorus(0.5, 3.0, 20, 20); } // DrawGLScene --------------------------------------------------------------- GLvoid display(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer drawShapes(GL_RENDER); glutSwapBuffers(); glFlush(); } // ReSizeGLScene ------------------------------------------------------------ GLvoid ReSizeGLScene(int Width, int Height) { glViewport (0, 0, (GLsizei) Width, (GLsizei) Height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0, (GLfloat) Width / (GLfloat) Height, 0.1, 100.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } // keyboard ------------------------------------------------------------ void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: // The ESC key // glutLeaveGameMode(); glutDestroyWindow(window); exit(0); break; default: printf("%c\n", key); break; } } // mouse_function ------------------------------------------------------------ void mouse_function(int button, int state, int x, int y) { if (state == GLUT_DOWN) { objectID = retrieveObjectID(x, y); switch (objectID) { case PYRAMID: printf("Saw the pyramid\n"); break; case CUBE: printf("Saw the cube\n"); break; case TORUS: printf("Saw the torus\n"); break; default: printf("I didn't see nothing!\n"); break; } } } // =================================================================== // int retrieveObjectID(int x, int y) // ------------------------------------------------------------------- // Version: 23. January 2003 22:51 // Created: 23. January 2003 22:51 // =================================================================== int retrieveObjectID(int x, int y) { int objectsFound = 0; GLint viewportCoords[4] = {0}; GLuint selectBuffer[32] = {0}; glSelectBuffer(32, selectBuffer); glGetIntegerv(GL_VIEWPORT, viewportCoords); glMatrixMode(GL_PROJECTION); glPushMatrix(); glRenderMode(GL_SELECT); glLoadIdentity(); gluPickMatrix(x, viewportCoords[3] - y, 2, 2, viewportCoords); gluPerspective(45.0f, (float)kWindowWidth/(float)kWindowHeight, 0.1f, 150.0f); glMatrixMode(GL_MODELVIEW); //DrawGLScene(); // ?? drawShapes(GL_SELECT); objectsFound = glRenderMode(GL_RENDER); glMatrixMode(GL_PROJECTION); glPopMatrix(); glMatrixMode(GL_MODELVIEW); if (objectsFound > 0) { GLuint lowestDepth = selectBuffer[1]; int selectedObject = selectBuffer[3]; for (int i = 1; i < objectsFound; i++) { if (selectBuffer[(i*4)+1] < lowestDepth) { lowestDepth = selectBuffer[(i*4)+1]; selectedObject = selectBuffer[(i*4)+3]; } } return selectedObject; } return 0; }