course/semester2/pprog/assignment1/single-thread/graphics.c

   1 /**
   2  * @file graphics.c
   3  * @author Sam Moore (20503628) 2012
   4  *      - Adapted from template program provided by UWA
   5  * @purpose Definition of graphics related functions
   6  * NOTE: This file is identical for both the single-threaded and multi-threaded versions of the program
   7  */
   8
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <time.h> // Needed for clock
  13 #include <math.h> // Maths functions (sin, cos)
  14
  15 #include "graphics.h" //Function declarations
  16 #include "nbody.h" //The simulation
  17 #include <GL/freeglut.h>
  18
  19 // --- Variable definitions --- //
  20 double previousTime, eyeTheta, eyePhi, eyeRho;
  21 float look[3];
  22 int windowWidth, windowHeight, upY;
  23 double scale = 1.0;
  24
  25
  26 /**
  27  * @function Graphics_Run
  28  * @purpose Setup and start the graphics engine
  29  * @param argc - Number of arguments to main function, passed to glutInit
  30  * @param argv - Argument strings for main function, passed to glutInit
  31  */
  32 void Graphics_Run(int argc, char ** argv)
  33 {
  34         if (options.draw_graphics == false)
  35         {
  36                 while (true)
  37                         Graphics_Display();
  38
  39                 return;
  40         }
  41
  42         glutInit(&argc, argv);
  43         glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  44         glutInitWindowSize(WIDTH, HEIGHT);
  45         glutInitWindowPosition(POSITION_X, POSITION_Y);
  46
  47         //Set window title based on version of program
  48         #ifdef SINGLE_THREADED
  49                 glutCreateWindow("N-Body : Single-Threaded");
  50         #elif defined PTHREADED
  51                 glutCreateWindow("N-Body : Multi-Threaded (pthread)");
  52         #elif defined OMP_THREADED
  53                 glutCreateWindow("N-Body : Multi-Threaded (OpenMP)");
  54         #else
  55                 glutCreateWindow("N-Body");
  56         #endif
  57         glutDisplayFunc(Graphics_Display);
  58         glutIdleFunc(Graphics_Display);
  59         glutKeyboardFunc(Graphics_Keyboard);
  60         glutReshapeFunc(Graphics_Reshape);
  61
  62
  63         glClearColor(1.0,1.0,1.0,0.0);
  64         glColor3f(0.0f, 0.0f, 0.0f);
  65         glPointSize(POINT_SIZE);
  66         glMatrixMode(GL_PROJECTION);
  67         glLoadIdentity();
  68
  69         /*init lighting */
  70
  71         GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  72         GLfloat mat_shininess[] = { 50.0 };
  73         GLfloat light_position[] = { 1.0, 1.0, 0.0, 0.0 };
  74         glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  75         glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
  76         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  77
  78         glColorMaterial(GL_FRONT,GL_DIFFUSE);                // Set Color Capability
  79
  80         glEnable(GL_LIGHTING);
  81         glEnable(GL_LIGHT0);
  82         glEnable(GL_DEPTH_TEST);
  83
  84         glEnable(GL_COLOR_MATERIAL);                   // Enable color
  85
  86
  87         windowWidth = WIDTH;
  88         windowHeight = HEIGHT;
  89         previousTime = clock();
  90         eyeTheta = 0;
  91         eyePhi = 0.5 * M_PI;
  92         eyeRho = RHO;
  93         upY = 1;
  94         look[0] = 0;
  95         look[1] = 0;
  96         look[2] = 0;
  97         gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);
  98
  99         glutMainLoop();
 100 }
 101
 102 /**
 103  * @function Graphics_Display
 104  * @purpose This function redraws the screen after the positions of particles
 105  *              have been updated.
 106  *      It also calls System_Compute, and checks for exit conditions, in the single-threaded version only
 107  */
 108 void Graphics_Display()
 109 {
 110         //Check whether the program should quit due to steps being computed, or a timeout
 111         if (ExitCondition())
 112         {
 113                 glutLeaveMainLoop();
 114                 return;
 115         }
 116
 117
 118         #ifdef SINGLE_THREADED
 119                 if (options.verbosity != 0 && universe.steps % options.verbosity == 1)
 120                         DisplayStatistics();
 121                 System_Compute(&universe);
 122         #endif
 123
 124
 125
 126         //Check whether the runstate has been set to quit the program
 127         switch (runstate)
 128         {
 129                 case RUN:
 130                         break;
 131                 case QUIT:
 132                         glutLeaveMainLoop();
 133                         return;
 134                         break;
 135                 case QUIT_ERROR:
 136                         glutLeaveMainLoop();
 137                         return;
 138                         break;
 139         }
 140
 141         if (options.draw_graphics == false)
 142                 return;
 143
 144
 145         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 146         glMatrixMode(GL_MODELVIEW);
 147         glLoadIdentity();
 148         gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
 149                 eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
 150
 151         for (int i = 0; i < universe.N; ++i)
 152         {
 153                 Body * b = universe.body+i;
 154                 glColor3f(0.0f, b->mass/1e11*100, 0.0f);
 155                 glPushMatrix(); // to save the current matrix
 156                 glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
 157                 glutSolidSphere (BALL_SIZE, 10, 10);
 158                 glPopMatrix(); // restore the previous matrix
 159         }
 160         glFlush();
 161 }
 162
 163 /**
 164  * @function Graphics_Keyboard
 165  * @purpose This function is to manipulate with the image
 166  * @param theKey key pressed
 167  * @param mouseX, mouseY position of the mouse in the window
 168  */
 169 void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY)
 170 {
 171         if (theKey == 'x' || theKey == 'X')
 172         {
 173                 glutLeaveMainLoop();
 174                 return;
 175         }
 176
 177                 if (theKey == 'i' || theKey == 'I') {
 178                         eyePhi -= M_PI / 20;
 179                 if (eyePhi == 0)
 180                                 eyePhi = 2 * M_PI;
 181                 } else if (theKey == 'm' || theKey == 'I') {
 182                         eyePhi += M_PI / 20;
 183                 } else if (theKey == 'j' || theKey == 'J') {
 184                         eyeTheta -= M_PI / 20;
 185                 } else if (theKey == 'k' || theKey == 'K') {
 186                         eyeTheta += M_PI / 20;
 187                 } else if (theKey == ',') {
 188                         eyeRho += 0.5;
 189                 } else if (theKey == '.' || theKey == 'I') {
 190                         eyeRho -= 0.5;
 191                 } else if (theKey == 'w' || theKey == 'W') {
 192                         look[1] += 0.5;
 193                 } else if (theKey == 'z' || theKey == 'Z') {
 194                         look[1] -= 0.5;
 195                 } else if (theKey == 'a' || theKey == 'A') {
 196                         look[0] -= 0.5;
 197                 } else if (theKey == 's' || theKey == 'S') {
 198                         look[0] += 0.5;
 199                 } else if (theKey == '+') {
 200                         scale *= 1.1;
 201                 } else if (theKey == '-') {
 202                         scale *= 0.9;
 203                 }
 204                 if (sin(eyePhi) > 0) upY = 1;
 205                 else upY = 1;
 206 }
 207
 208 /**
 209  * @function Graphics_Reshape
 210  * @purpose Resize the view window
 211  * @param width, height - New size of the window
 212  */
 213 void Graphics_Reshape(int width, int height)
 214 {
 215         double displayRatio = 1.0 * width / height;
 216         windowWidth = width;
 217         windowHeight = height;
 218         glMatrixMode(GL_PROJECTION);
 219         glLoadIdentity();
 220         gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
 221         glViewport(0, 0, windowWidth, windowHeight);
 222 }
 223
 224
 225