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
  18 // --- Variable definitions --- //
  19 double previousTime, eyeTheta, eyePhi, eyeRho;
  20 float look[3];
  21 int windowWidth, windowHeight, upY;
  22 double scale = 1.0;
  23
  24
  25 /**
  26  * @function Graphics_Run
  27  * @purpose Setup and start the graphics engine
  28  * @param argc - Number of arguments to main function, passed to glutInit
  29  * @param argv - Argument strings for main function, passed to glutInit
  30  */
  31 void Graphics_Run(int argc, char ** argv)
  32 {
  33         if (options.draw_graphics == false)
  34         {
  35                 while (true)
  36                         Graphics_Display();
  37
  38                 return;
  39         }
  40
  41         glutInit(&argc, argv);
  42         glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  43         glutInitWindowSize(WIDTH, HEIGHT);
  44         glutInitWindowPosition(POSITION_X, POSITION_Y);
  45
  46         //Set window title based on version of program
  47         #ifdef SINGLE_THREADED
  48                 glutCreateWindow("N-Body : Single-Threaded");
  49         #elif defined PTHREADED
  50                 glutCreateWindow("N-Body : Multi-Threaded (pthread)");
  51         #elif defined OMP_THREADED
  52                 glutCreateWindow("N-Body : Multi-Threaded (OpenMP)");
  53         #else
  54                 glutCreateWindow("N-Body");
  55         #endif
  56         glutDisplayFunc(Graphics_Display);
  57         glutIdleFunc(Graphics_Display);
  58         glutKeyboardFunc(Graphics_Keyboard);
  59         glutReshapeFunc(Graphics_Reshape);
  60
  61
  62         glClearColor(1.0,1.0,1.0,0.0);
  63         glColor3f(0.0f, 0.0f, 0.0f);
  64         glPointSize(POINT_SIZE);
  65         glMatrixMode(GL_PROJECTION);
  66         glLoadIdentity();
  67
  68         /*init lighting */
  69
  70         GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  71         GLfloat mat_shininess[] = { 50.0 };
  72         GLfloat light_position[] = { 1.0, 1.0, 0.0, 0.0 };
  73         glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  74         glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
  75         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  76
  77         glColorMaterial(GL_FRONT,GL_DIFFUSE);                // Set Color Capability
  78
  79         glEnable(GL_LIGHTING);
  80         glEnable(GL_LIGHT0);
  81         glEnable(GL_DEPTH_TEST);
  82
  83         glEnable(GL_COLOR_MATERIAL);                   // Enable color
  84
  85
  86         windowWidth = WIDTH;
  87         windowHeight = HEIGHT;
  88         previousTime = clock();
  89         eyeTheta = 0;
  90         eyePhi = 0.5 * M_PI;
  91         eyeRho = RHO;
  92         upY = 1;
  93         look[0] = 0;
  94         look[1] = 0;
  95         look[2] = 0;
  96         gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);
  97
  98         glutMainLoop();
  99 }
 100
 101 /**
 102  * @function Graphics_Display
 103  * @purpose This function redraws the screen after the positions of particles
 104  *              have been updated.
 105  *      It also calls System_Compute, and checks for exit conditions, in the single-threaded version only
 106  */
 107 void Graphics_Display()
 108 {
 109
 110
 111         if (options.verbosity != 0 && universe.steps % options.verbosity == 1)
 112                 DisplayStatistics();
 113
 114         #ifdef SINGLE_THREADED
 115                 System_Compute(&universe);
 116
 117                 //Check whether the program should quit due to steps being computed, or a timeout
 118                 if (options.timeout > 0.0)
 119                 {
 120                         if ((unsigned)(time(NULL) - options.start_time.tv_sec) >= options.timeout)
 121                                 exit(EXIT_SUCCESS);
 122                 }
 123                 if (options.num_steps > 0 && universe.steps > options.num_steps)
 124                         exit(EXIT_SUCCESS);
 125
 126
 127         #endif
 128
 129
 130         //Check whether the runstate has been set to quit the program
 131         switch (runstate)
 132         {
 133                 case RUN:
 134                         break;
 135                 case QUIT:
 136                         exit(EXIT_SUCCESS);
 137                         break;
 138                 case QUIT_ERROR:
 139                         exit(EXIT_FAILURE);
 140                         break;
 141         }
 142
 143         if (options.draw_graphics == false)
 144                 return;
 145
 146
 147         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 148         glMatrixMode(GL_MODELVIEW);
 149         glLoadIdentity();
 150         gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
 151                 eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
 152
 153         for (int i = 0; i < universe.N; ++i)
 154         {
 155                 Body * b = universe.body+i;
 156                 glColor3f(0.0f, b->mass/1e11*100, 0.0f);
 157                 glPushMatrix(); // to save the current matrix
 158                 glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
 159                 glutSolidSphere (BALL_SIZE, 10, 10);
 160                 glPopMatrix(); // restore the previous matrix
 161         }
 162         glFlush();
 163 }
 164
 165 /**
 166  * @function Graphics_Keyboard
 167  * @purpose This function is to manipulate with the image
 168  * @param theKey key pressed
 169  * @param mouseX, mouseY position of the mouse in the window
 170  */
 171 void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY)
 172 {
 173         if (theKey == 'x' || theKey == 'X')
 174         {
 175                 exit(EXIT_SUCCESS);
 176         }
 177
 178                 if (theKey == 'i' || theKey == 'I') {
 179                         eyePhi -= M_PI / 20;
 180                 if (eyePhi == 0)
 181                                 eyePhi = 2 * M_PI;
 182                 } else if (theKey == 'm' || theKey == 'I') {
 183                         eyePhi += M_PI / 20;
 184                 } else if (theKey == 'j' || theKey == 'J') {
 185                         eyeTheta -= M_PI / 20;
 186                 } else if (theKey == 'k' || theKey == 'K') {
 187                         eyeTheta += M_PI / 20;
 188                 } else if (theKey == ',') {
 189                         eyeRho += 0.5;
 190                 } else if (theKey == '.' || theKey == 'I') {
 191                         eyeRho -= 0.5;
 192                 } else if (theKey == 'w' || theKey == 'W') {
 193                         look[1] += 0.5;
 194                 } else if (theKey == 'z' || theKey == 'Z') {
 195                         look[1] -= 0.5;
 196                 } else if (theKey == 'a' || theKey == 'A') {
 197                         look[0] -= 0.5;
 198                 } else if (theKey == 's' || theKey == 'S') {
 199                         look[0] += 0.5;
 200                 } else if (theKey == '+') {
 201                         scale *= 1.1;
 202                 } else if (theKey == '-') {
 203                         scale *= 0.9;
 204                 }
 205                 if (sin(eyePhi) > 0) upY = 1;
 206                 else upY = 1;
 207 }
 208
 209 /**
 210  * @function Graphics_Reshape
 211  * @purpose Resize the view window
 212  * @param width, height - New size of the window
 213  */
 214 void Graphics_Reshape(int width, int height)
 215 {
 216         double displayRatio = 1.0 * width / height;
 217         windowWidth = width;
 218         windowHeight = height;
 219         glMatrixMode(GL_PROJECTION);
 220         glLoadIdentity();
 221         gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
 222         glViewport(0, 0, windowWidth, windowHeight);
 223 }
 224
 225
 226