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                 //printf("Leave graphics loop\n");
 114                 glutLeaveMainLoop();
 115                 return;
 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         if (options.draw_graphics == false)
 125                 return;
 126
 127
 128         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 129         glMatrixMode(GL_MODELVIEW);
 130         glLoadIdentity();
 131         gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
 132                 eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
 133
 134         for (int i = 0; i < universe.N; ++i)
 135         {
 136                 Body * b = universe.body+i;
 137                 glColor3f(0.0f, b->mass/1e11*100, 0.0f);
 138                 glPushMatrix(); // to save the current matrix
 139                 glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
 140                 glutSolidSphere (BALL_SIZE, 10, 10);
 141                 glPopMatrix(); // restore the previous matrix
 142         }
 143         glFlush();
 144 }
 145
 146 /**
 147  * @function Graphics_Keyboard
 148  * @purpose This function is to manipulate with the image
 149  * @param theKey key pressed
 150  * @param mouseX, mouseY position of the mouse in the window
 151  */
 152 void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY)
 153 {
 154         if (theKey == 'x' || theKey == 'X')
 155         {
 156                 QuitProgram(false);
 157                 return;
 158         }
 159
 160                 if (theKey == 'i' || theKey == 'I') {
 161                         eyePhi -= M_PI / 20;
 162                 if (eyePhi == 0)
 163                                 eyePhi = 2 * M_PI;
 164                 } else if (theKey == 'm' || theKey == 'I') {
 165                         eyePhi += M_PI / 20;
 166                 } else if (theKey == 'j' || theKey == 'J') {
 167                         eyeTheta -= M_PI / 20;
 168                 } else if (theKey == 'k' || theKey == 'K') {
 169                         eyeTheta += M_PI / 20;
 170                 } else if (theKey == ',') {
 171                         eyeRho += 0.5;
 172                 } else if (theKey == '.' || theKey == 'I') {
 173                         eyeRho -= 0.5;
 174                 } else if (theKey == 'w' || theKey == 'W') {
 175                         look[1] += 0.5;
 176                 } else if (theKey == 'z' || theKey == 'Z') {
 177                         look[1] -= 0.5;
 178                 } else if (theKey == 'a' || theKey == 'A') {
 179                         look[0] -= 0.5;
 180                 } else if (theKey == 's' || theKey == 'S') {
 181                         look[0] += 0.5;
 182                 } else if (theKey == '+') {
 183                         scale *= 1.1;
 184                 } else if (theKey == '-') {
 185                         scale *= 0.9;
 186                 }
 187                 if (sin(eyePhi) > 0) upY = 1;
 188                 else upY = 1;
 189 }
 190
 191 /**
 192  * @function Graphics_Reshape
 193  * @purpose Resize the view window
 194  * @param width, height - New size of the window
 195  */
 196 void Graphics_Reshape(int width, int height)
 197 {
 198         double displayRatio = 1.0 * width / height;
 199         windowWidth = width;
 200         windowHeight = height;
 201         glMatrixMode(GL_PROJECTION);
 202         glLoadIdentity();
 203         gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
 204         glViewport(0, 0, windowWidth, windowHeight);
 205 }
 206
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 208