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 #ifdef FLYING_CAMERA
  26 Camera eye;
  27 #endif //FLYING_CAMERA
  28
  29 /**
  30  * @function Graphics_Run
  31  * @purpose Setup and start the graphics engine
  32  * @param argc - Number of arguments to main function, passed to glutInit
  33  * @param argv - Argument strings for main function, passed to glutInit
  34  */
  35 void Graphics_Run(int argc, char ** argv)
  36 {
  37         if (options.draw_graphics == false)
  38         {
  39                 // This message is left here for when I inevitably accidentally call the function
  40                 fprintf(stderr, "Graphics_Run should not be called if graphics are disabled!\n");
  41                 exit(EXIT_FAILURE);
  42         }
  43
  44         glutInit(&argc, argv);
  45         glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  46         glutInitWindowSize(WIDTH, HEIGHT);
  47         glutInitWindowPosition(POSITION_X, POSITION_Y);
  48
  49         //Set window title based on version of program
  50         #ifdef SINGLE_THREADED
  51                 glutCreateWindow("N-Body : Single-Threaded");
  52         #elif defined PTHREADED
  53                 glutCreateWindow("N-Body : Multi-Threaded (pthread)");
  54         #elif defined OMP_THREADED
  55                 glutCreateWindow("N-Body : Multi-Threaded (OpenMP)");
  56         #else
  57                 glutCreateWindow("N-Body");
  58         #endif
  59         glutDisplayFunc(Graphics_Display);
  60         glutIdleFunc(Graphics_Display);
  61         glutKeyboardFunc(Graphics_Keyboard);
  62         glutReshapeFunc(Graphics_Reshape);
  63
  64
  65         glClearColor(1.0,1.0,1.0,0.0);
  66         glColor3f(0.0f, 0.0f, 0.0f);
  67         glPointSize(POINT_SIZE);
  68         glMatrixMode(GL_PROJECTION);
  69         glLoadIdentity();
  70
  71         /*init lighting */
  72
  73         GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  74         GLfloat mat_shininess[] = { 50.0 };
  75         GLfloat light_position[] = { 1.0, 1.0, 0.0, 0.0 };
  76         glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  77         glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
  78         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  79
  80         glColorMaterial(GL_FRONT,GL_DIFFUSE);                // Set Color Capability
  81
  82         glEnable(GL_LIGHTING);
  83         glEnable(GL_LIGHT0);
  84         glEnable(GL_DEPTH_TEST);
  85
  86         glEnable(GL_COLOR_MATERIAL);                   // Enable color
  87
  88
  89         windowWidth = WIDTH;
  90         windowHeight = HEIGHT;
  91         previousTime = clock();
  92         eyeTheta = 0;
  93         eyePhi = 0.5 * M_PI;
  94         eyeRho = RHO;
  95         upY = 1;
  96         look[0] = 0;
  97         look[1] = 0;
  98         look[2] = 0;
  99         gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);
 100
 101         #ifdef FLYING_CAMERA
 102         eye.x[0] = 1; eye.x[1] = 0; eye.x[2] = 0;
 103         eye.y[0] = 0; eye.y[1] = 1; eye.y[2] = 0;
 104         eye.z[0] = 0; eye.z[1] = 0; eye.z[2] = 1;
 105         #endif //FLYING_CAMERA
 106
 107         glutMainLoop();
 108 }
 109
 110 /**
 111  * @function Graphics_Display
 112  * @purpose This function redraws the screen after the positions of particles
 113  *              have been updated.
 114  *      It also calls System_Compute, and checks for exit conditions, in the single-threaded version only
 115  */
 116 void Graphics_Display()
 117 {
 118
 119         if (options.draw_graphics == false)
 120         {
 121                 // This message is left here for when I inevitably accidentally call the function
 122                 fprintf(stderr, "Graphics_Display should not be called if graphics are disabled!\n");
 123                 exit(EXIT_FAILURE);
 124         }
 125
 126         //Check whether the graphics thread should exit for any reason
 127         if (ExitCondition())
 128         {
 129                 glutLeaveMainLoop();    // original glut does not have this, which makes "nicely" exiting a bit annoying
 130                 return;
 131         }
 132
 133         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 134         glMatrixMode(GL_MODELVIEW);
 135         glLoadIdentity();
 136
 137         #ifdef FLYING_CAMERA
 138         gluLookAt(eye.p[0], eye.p[1], eye.p[2],
 139                 eye.p[0] + eye.x[0], eye.p[1] + eye.x[1], eye.p[2] + eye.x[2],
 140                 eye.z[0], eye.z[1], eye.z[2]);
 141         #else
 142         gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
 143                 eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
 144         #endif //FLYING_CAMERA
 145
 146         BeforeDraw(); // Stuff to do before graphics is allowed to draw
 147                         // Single-thread - perform a computation step, obviously! It's not done anywhere else
 148                         // Multiple threads - ensure that all body positions are updated (ie: not halfway through step).
 149                         //      (We don't care about the force and velocity variables though)
 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                 //glColor3f(1.0f, 0.0f, 0.0f);
 156                 glPushMatrix(); // to save the current matrix
 157                 glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
 158                 glutSolidSphere (BALL_SIZE, 10, 10);
 159                 glPopMatrix(); // restore the previous matrix
 160         }
 161         glFlush();
 162
 163         AfterDraw(); // Stuff to do after graphics is done drawing
 164                         // Single-thread - Nothing at all
 165                         // Multiple threads - signal threads it is safe to change position variables
 166
 167 }
 168
 169 /**
 170  * @function Graphics_Keyboard
 171  * @purpose This function is to manipulate with the image
 172  * @param theKey key pressed
 173  * @param mouseX, mouseY position of the mouse in the window
 174  */
 175 void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY)
 176 {
 177         if (theKey == 'x' || theKey == 'X')
 178         {
 179                 QuitProgram(false);
 180                 return;
 181         }
 182
 183         #ifdef FLYING_CAMERA
 184         switch (theKey)
 185         {
 186                 case 'W':
 187                 case 'w':
 188                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 189                                 eye.p[i] += eye.x[i];
 190                         break;
 191                 case 'S':
 192                 case 's':
 193                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 194                                 eye.p[i] -= eye.x[i];
 195                         break;
 196                 case 'A':
 197                 case 'a':
 198                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 199                                 eye.p[i] += eye.y[i];
 200                         break;
 201                 case 'D':
 202                 case 'd':
 203                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 204                                 eye.p[i] -= eye.y[i];
 205                         break;
 206                 case 'Z':
 207                 case 'z':
 208                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 209                                 eye.p[i] += eye.z[i];
 210                         break;
 211                 case 'C':
 212                 case 'c':
 213                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 214                                 eye.p[i] -= eye.z[i];
 215                         break;
 216
 217                 case 'I':
 218                 case 'i':
 219                 {
 220                         float theta = M_PI/80.0;
 221                         Camera old = eye;
 222
 223                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 224                         {
 225                                 eye.z[i] = old.z[i] * cos(theta) + old.x[i] * sin(theta);
 226                                 eye.x[i] = old.x[i] * cos(theta) - old.z[i] * sin(theta);
 227                         }
 228                         break;
 229                 }
 230                 case 'K':
 231                 case 'k':
 232                 {
 233                         float theta = -M_PI/80.0;
 234                         Camera old = eye;
 235
 236                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 237                         {
 238                                 eye.z[i] = old.z[i] * cos(theta) + old.x[i] * sin(theta);
 239                                 eye.x[i] = old.x[i] * cos(theta) - old.z[i] * sin(theta);
 240                         }
 241                         break;
 242                 }
 243
 244                 case 'J':
 245                 case 'j':
 246                 {
 247                         float theta = -M_PI/80.0;
 248                         Camera old = eye;
 249
 250                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 251                         {
 252                                 eye.y[i] = old.y[i] * cos(theta) + old.x[i] * sin(theta);
 253                                 eye.x[i] = old.x[i] * cos(theta) - old.y[i] * sin(theta);
 254                         }
 255                         break;
 256                 }
 257
 258                 case 'L':
 259                 case 'l':
 260                 {
 261                         float theta = M_PI/80.0;
 262                         Camera old = eye;
 263
 264                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 265                         {
 266                                 eye.y[i] = old.y[i] * cos(theta) + old.x[i] * sin(theta);
 267                                 eye.x[i] = old.x[i] * cos(theta) - old.y[i] * sin(theta);
 268                         }
 269                         break;
 270                 }
 271
 272                 case 'Q':
 273                 case 'q':
 274                 {
 275                         float theta = M_PI/80.0;
 276                         Camera old = eye;
 277
 278                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 279                         {
 280                                 eye.z[i] = old.z[i] * cos(theta) + old.y[i] * sin(theta);
 281                                 eye.y[i] = old.y[i] * cos(theta) - old.z[i] * sin(theta);
 282                         }
 283                         break;
 284                 }
 285                 case 'E':
 286                 case 'e':
 287                 {
 288                         float theta = -M_PI/80.0;
 289                         Camera old = eye;
 290
 291                         for (unsigned i = 0; i < DIMENSIONS; ++i)
 292                         {
 293                                 eye.z[i] = old.z[i] * cos(theta) + old.y[i] * sin(theta);
 294                                 eye.y[i] = old.y[i] * cos(theta) - old.z[i] * sin(theta);
 295                         }
 296                         break;
 297                 }
 298         }
 299
 300         /*
 301         float x = 0; float y = 0; float z = 0;
 302         for (unsigned i = 0; i < DIMENSIONS; ++i)
 303         {
 304                 x += eye.x[i] * eye.x[i];
 305                 y += eye.y[i] * eye.y[i];
 306                 z += eye.z[i] * eye.z[i];
 307         }
 308         for (unsigned i = 0; i < DIMENSIONS; ++i)
 309         {
 310                 eye.x[i] /= sqrt(x);
 311                 eye.y[i] /= sqrt(y);
 312                 eye.z[i] /= sqrt(z);
 313         }
 314         */
 315         system("clear");
 316         printf("Camera status:\n");
 317         printf("Position: %f %f %f\n", eye.p[0], eye.p[1], eye.p[2]);
 318         printf("x: %f %f %f (%f)\n", eye.x[0], eye.x[1], eye.x[2], sqrt(eye.x[0]*eye.x[0] + eye.x[1]*eye.x[1] + eye.x[2]*eye.x[2]));
 319         printf("y: %f %f %f (%f)\n", eye.y[0], eye.y[1], eye.y[2], sqrt(eye.y[0]*eye.y[0] + eye.y[1]*eye.y[1] + eye.y[2]*eye.y[2]));
 320         printf("z: %f %f %f (%f)\n", eye.z[0], eye.z[1], eye.z[2], sqrt(eye.z[0]*eye.z[0] + eye.z[1]*eye.z[1] + eye.z[2]*eye.z[2]));
 321
 322         #else
 323
 324
 325
 326                 if (theKey == 'i' || theKey == 'I') {
 327                         eyePhi -= M_PI / 20;
 328                 if (eyePhi == 0)
 329                                 eyePhi = 2 * M_PI;
 330                 } else if (theKey == 'm' || theKey == 'I') {
 331                         eyePhi += M_PI / 20;
 332                 } else if (theKey == 'j' || theKey == 'J') {
 333                         eyeTheta -= M_PI / 20;
 334                 } else if (theKey == 'k' || theKey == 'K') {
 335                         eyeTheta += M_PI / 20;
 336                 } else if (theKey == ',') {
 337                         eyeRho += 0.5;
 338                 } else if (theKey == '.' || theKey == 'I') {
 339                         eyeRho -= 0.5;
 340                 } else if (theKey == 'w' || theKey == 'W') {
 341                         look[1] += 0.5;
 342                 } else if (theKey == 'z' || theKey == 'Z') {
 343                         look[1] -= 0.5;
 344                 } else if (theKey == 'a' || theKey == 'A') {
 345                         look[0] -= 0.5;
 346                 } else if (theKey == 's' || theKey == 'S') {
 347                         look[0] += 0.5;
 348                 } else if (theKey == '+') {
 349                         scale *= 1.1;
 350                 } else if (theKey == '-') {
 351                         scale *= 0.9;
 352                 }
 353                 if (sin(eyePhi) > 0) upY = 1;
 354                 else upY = 1;
 355         #endif //FLYING_CAMERA
 356 }
 357
 358 /**
 359  * @function Graphics_Reshape
 360  * @purpose Resize the view window
 361  * @param width, height - New size of the window
 362  */
 363 void Graphics_Reshape(int width, int height)
 364 {
 365         double displayRatio = 1.0 * width / height;
 366         windowWidth = width;
 367         windowHeight = height;
 368         glMatrixMode(GL_PROJECTION);
 369         glLoadIdentity();
 370         gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
 371         glViewport(0, 0, windowWidth, windowHeight);
 372 }
 373
 374
 375