src/mercenary/main.c

   1 /* main routine
   2  *
   3  * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
   4  * All Rights Reserved
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <math.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include "../../include/keycodes.h"
  28 #include "../libsdl/sdl.h"
  29 #ifdef HAVE_OVR
  30 #include "../libovr/ovr.h"
  31 #include "../libovr/keyboard.h"
  32 #endif
  33 #include "../libsdl/opengl.h"
  34 #include "../libsdl/print.h"
  35 #include "../libcpu/m68k.h"
  36 #include "../libcpu/execute.h"
  37 #include "../libframerate/framerate.h"
  38 #include "../libvideo/video.h"
  39 #include "../libsound/sound.h"
  40 #include "../libjoystick/joystick.h"
  41 #include "../libkeyboard/keyboard.h"
  42 #include "../libdisk/disk.h"
  43 #include "../libtext/text.h"
  44 #include "mercenary.h"
  45 #include "render.h"
  46
  47 #define FOV_MIN         10.0
  48 #define FOV_NOVAGEN     64.0
  49 #define FOV_JOLLY       80.0
  50 #define FOV_MAX         170.0
  51
  52 #define STICK_WALK_THRESHOLD 0.3 /* move the stick until the player moves */
  53 #define STICK_ROTATE_THRESHOLD 0.3 /* move the stick until the player rotates */
  54 #define STICK_THRUST_THRESHOLD 0.3 /* move the stick until the craft moves */
  55
  56 static int config_ctrl_c = 0;
  57 static int config_amiga_speed = 0; /* fast speed */
  58 static double config_fps = 16.0;
  59 #if !defined(_WIN32)
  60 static const char *config_gamesave_dir = ".mercenary";
  61 #endif
  62 static int config_video_filter = 1;
  63 static int config_audio_filter = 1;
  64 static int config_render = 1; /* opengl render */
  65 static int config_skip_intro = 0;
  66 static int config_multisampling = 8;
  67 static double config_fov = FOV_NOVAGEN;
  68 static double config_monitor_distance = 31.5; /* inch */
  69 #ifdef HAVE_OVR
  70 static double config_keyboard_distance = 28.5; /* inch */
  71 static double config_keyboard_height = 10.0; /* inch */
  72 #endif
  73 static double config_benson_size = 1.0;
  74 static int config_debug_transparent = 0;
  75 static int config_debug_opengl = 0;
  76 /* render improvements */
  77 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  78 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  79
  80 #define CPU_SPEED       7093790.0;
  81
  82 #define SOUND_SAMPLERATE 48000
  83 /* - game IRQ rate
  84  * - must be used for sound rendering chunk
  85  */
  86 #define IRQ_RATE        50
  87 /* numbe of buffer chunks to dejitter:
  88  * - SDL render interval
  89  * - sound rendering interval
  90  * - sound card interval
  91  * 4 should be minimum, if video rate is >=50 Hz
  92  */
  93 #define SOUND_CHUNKS    4
  94
  95 /* test sound to check if buffer does not overflow / underrun */
  96 //#define DEBUG_SOUND_BUFFERING
  97
  98 #define IOSIZE          0x1000 /* bytes in io space */
  99 #define MEMORY_SIZE     0x80000
 100 static uint8_t *memory = NULL;
 101 static uint8_t *stop_event = NULL;
 102 static uint8_t *image = NULL;
 103 static uint8_t *help_osd[2] = { NULL, NULL };
 104 static uint8_t *info_osd = NULL;
 105 static int help_view = 1;
 106 static int help_views = 1;
 107 static int32_t osd_timer = 0;
 108 #ifdef HAVE_OVR
 109 #define SCREEN_WIDTH    1344
 110 #define SCREEN_HEIGHT   800
 111 #else
 112 #define SCREEN_WIDTH    (320*3)
 113 #define SCREEN_HEIGHT   (200*3)
 114 #endif
 115 #define IMAGE_WIDTH     320
 116 #define IMAGE_HEIGHT    200
 117 #define BENSON_AT_LINE  136
 118 #define IMAGE_DIWSTART  0x2c
 119 #define HELP_ALPHA      0xd0
 120 #define OSD_WIDTH       320
 121 #define OSD_HEIGHT      16
 122 static uint16_t *chipreg = NULL;
 123 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 124 static int sound_buffer_size; /* buffer sample size */
 125 static int sound_buffer_writep; /* write pointer at buffer */
 126 static int sound_buffer_readp; /* read pointer at buffer */
 127 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 128 static double benson_size; /* render size of benson */
 129 static int render_legacy = 0; /* render original amiga screen, if set */
 130 static int render_improved = 0; /* render improved image, if set */
 131 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 132 static int intro_skipped = 0; /* indicated if we already have landed */
 133 static int window_width, window_height;
 134
 135 static const char *home_dir;
 136
 137 static int quit = 0;
 138
 139 int parse_args(int argc, char *argv[])
 140 {
 141         int i = 1;
 142
 143         while (argc > i) {
 144                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 145                         print_info("Usage: %s\n", argv[0]);
 146                         print_info(" -s --render-speed original | fast\n");
 147                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 148                         print_info("    --fps <fps>\n");
 149                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 150                         print_info(" -v --video-filter on | off\n");
 151                         print_info("        Set video filter.\n");
 152                         print_info(" -a --audio-filter on | off\n");
 153                         print_info("        Set audio filter.\n");
 154                         print_info(" -r --render original | opengl\n");
 155                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 156                         print_info(" -b --benson normal | half\n");
 157                         print_info("        Size of 'Benson' (control panel).\n");
 158                         print_info(" -m --multisampling <samples>\n");
 159                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 160                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 161                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 162                         print_info(" -i --skip-intro\n");
 163                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 164                         print_info("Debug options:\n");
 165                         print_info(" -o --debug-opengl\n");
 166                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 167                         print_info("    --debug-transparent\n");
 168                         print_info("        Draw all things half transparent.\n");
 169                         print_info("    --ctrl-c\n");
 170                         print_info("        Use CTRL+C to exit game (used for development)\n");
 171                         return -1;
 172                 } else
 173                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 174                         i++;
 175                         if (argc == i) {
 176 missing_parameter:
 177                                 print_info("Missing parameter, use '--help'!\n");
 178                                 return -1;
 179                         }
 180                         if (!strcmp(argv[i], "original"))
 181                                 config_amiga_speed = 1;
 182                         else
 183                         if (!strcmp(argv[i], "fast"))
 184                                 config_amiga_speed = 0;
 185                         else {
 186 illegal_parameter:
 187                                 print_info("Illegal parameter, use '--help'!\n");
 188                                 return -1;
 189                         }
 190                 } else
 191                 if (!strcmp(argv[i], "--fps")) {
 192                         i++;
 193                         if (argc == i)
 194                                 goto missing_parameter;
 195                         config_fps = atof(argv[i]);
 196                         if (config_fov <= 0.0)
 197                                 goto illegal_parameter;
 198                 } else
 199                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 200                         i++;
 201                         if (argc == i)
 202                                 goto missing_parameter;
 203                         if (!strcmp(argv[i], "on"))
 204                                 config_video_filter = 1;
 205                         else
 206                         if (!strcmp(argv[i], "off"))
 207                                 config_video_filter = 0;
 208                         else
 209                                 goto illegal_parameter;
 210                 } else
 211                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 212                         i++;
 213                         if (argc == i)
 214                                 goto missing_parameter;
 215                         if (!strcmp(argv[i], "on"))
 216                                 config_audio_filter = 1;
 217                         else
 218                         if (!strcmp(argv[i], "off"))
 219                                 config_audio_filter = 0;
 220                         else
 221                                 goto illegal_parameter;
 222                 } else
 223                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 224                         i++;
 225                         if (argc == i)
 226                                 goto missing_parameter;
 227                         if (!strcmp(argv[i], "original"))
 228                                 config_render = 0;
 229                         else
 230                         if (!strcmp(argv[i], "opengl"))
 231                                 config_render = 1;
 232                         else
 233                                 goto illegal_parameter;
 234                 } else
 235                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 236                         i++;
 237                         if (argc == i)
 238                                 goto missing_parameter;
 239                         if (!strcmp(argv[i], "normal"))
 240                                 config_benson_size = 1.0;
 241                         else
 242                         if (!strcmp(argv[i], "half")) {
 243                                 config_benson_size = 0.5;
 244                                 if (config_fov == FOV_NOVAGEN)
 245                                         config_fov = FOV_JOLLY;
 246                         } else
 247                                 goto illegal_parameter;
 248                 } else
 249                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 250                         i++;
 251                         if (argc == i)
 252                                 goto missing_parameter;
 253                         config_multisampling = atoi(argv[i]);
 254                 } else
 255                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 256                         i++;
 257                         if (argc == i)
 258                                 goto missing_parameter;
 259                         config_fov = atof(argv[i]);
 260                         if (config_fov < 1.0 || config_fov > 179.0)
 261                                 goto illegal_parameter;
 262                 } else
 263                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 264                         config_skip_intro = 1;
 265                 } else
 266                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 267                         config_debug_opengl = 1;
 268                 } else
 269                 if (!strcmp(argv[i], "--debug-transparent")) {
 270                         config_debug_transparent = 1;
 271                 } else
 272                 if (!strcmp(argv[i], "--ctrl-c")) {
 273                         config_ctrl_c = 1;
 274                 } else {
 275                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 276                         return -1;
 277                 }
 278                 i++;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static void osd_info(const char *param, const char *value)
 285 {
 286         char line[41] = "                                        ";
 287
 288         if (param[0]) {
 289                 strncpy(line + 21 - strlen(param), param, strlen(param));
 290                 line[22] = ':';
 291         }
 292         if (strlen(value) > 15) {
 293                 print_error("string too long\n");
 294                 return;
 295         }
 296         strncpy(line + 25, value, strlen(value));
 297         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 298         osd_timer = ticks_sdl() + 2500;
 299 }
 300
 301 static void resize_window(int width, int height)
 302 {
 303         window_width = width;
 304         window_height = height;
 305 }
 306
 307 #ifdef HAVE_OVR
 308 static int __attribute__((unused)) button_a_last = 0, button_b_last = 0, button_x_last = 0, button_y_last = 0, button_menu_last = 0, button_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 309 static double __attribute__((unused)) stick_left_x_last = 0.0, stick_left_y_last = 0.0, stick_right_x_last = 0.0, stick_right_y_last = 0.0;
 310 static int thrust_last = KEYCODE_SPACE;
 311 static int keyboard_on = 0;
 312 static enum keycode vr_key_pressed = 0, vr_key = 0;
 313
 314 static void handle_vr_poses(void)
 315 {
 316         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 317         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 318         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 319         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 320         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 321         int thrust = KEYCODE_SPACE;
 322
 323         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_trigger, &button_left_thumb, &button_right_thumb, &hand_right_x, &hand_right_y, &hand_right_z, &hand_right_yaw, &hand_right_pitch, &hand_right_roll, &stick_left_x, &stick_left_y, &stick_right_x, &stick_right_y, &head_yaw, &head_pitch, &head_roll);
 324         if (button_menu && !button_menu_last) {
 325                 /* menu toggle */
 326                 if (help_view == help_views)
 327                         help_view = 0;
 328                 else
 329                         help_view++;
 330         }
 331         if (help_view) {
 332                 if (button_trigger && !button_trigger_last) {
 333                         /* rigger pressed */
 334                         normalize_observer_ovr();
 335                         osd_info("", "change height");
 336                 }
 337         } else {
 338                 /* handle input */
 339                 if (button_a && !button_a_last) {
 340                         /* keyboard A toggle */
 341                         if (keyboard_on == 1)
 342                                 keyboard_on = 0;
 343                         else
 344                                 keyboard_on = 1;
 345                 }
 346                 if (button_b && !button_b_last) {
 347                         /* keyboard B toggle */
 348                         if (keyboard_on == 2)
 349                                 keyboard_on = 0;
 350                         else
 351                                 keyboard_on = 2;
 352                 }
 353                 if (button_x && !button_x_last) {
 354                         /* 'board' pressed */
 355                         set_amiga_key(KEYCODE_b, 1);
 356                         set_amiga_key(KEYCODE_b, 0);
 357                 }
 358                 if (button_y && !button_y_last) {
 359                         /* 'leave' pressed */
 360                         set_amiga_key(KEYCODE_l, 1);
 361                         set_amiga_key(KEYCODE_l, 0);
 362                 }
 363                 if (button_left_thumb && !button_left_thumb_last) {
 364                         /* 'escape' pressed */
 365                         set_amiga_key(KEYCODE_ESCAPE, 1);
 366                         set_amiga_key(KEYCODE_ESCAPE, 0);
 367                 }
 368                 if (!button_left_thumb && button_left_thumb_last) {
 369                         /* 'escape' released */
 370                         set_amiga_key(KEYCODE_SPACE, 1);
 371                         set_amiga_key(KEYCODE_SPACE, 0);
 372                 }
 373                 if (button_trigger && !button_trigger_last) {
 374                         /* trigger pressed */
 375                         if (!keyboard_on) {
 376                                 set_joystick(-1, -1, -1, -1, 1);
 377                         } else if (vr_key) {
 378                                 vr_key_pressed = vr_key;
 379                                 set_amiga_key(vr_key_pressed, 1);
 380                         }
 381                 }
 382                 if (!button_trigger && button_trigger_last) {
 383                         /* trigger released */
 384                         set_joystick(-1, -1, -1, -1, 0);
 385                         if (vr_key_pressed) {
 386                                 set_amiga_key(vr_key_pressed, 0);
 387                                 vr_key_pressed = 0;
 388                         }
 389                 }
 390                 /* joystick */
 391                 if (stick_right_x > STICK_ROTATE_THRESHOLD)
 392                         set_joystick(0, 1, -1, -1, -1);
 393                 else
 394                 if (stick_right_x < -STICK_ROTATE_THRESHOLD)
 395                         set_joystick(1, 0, -1, -1, -1);
 396                 else
 397                 if (stick_right_x_last > STICK_ROTATE_THRESHOLD || stick_right_x_last < -STICK_ROTATE_THRESHOLD)
 398                         set_joystick(0, 0, -1, -1, -1);
 399                 if (stick_right_y > STICK_WALK_THRESHOLD)
 400                         set_joystick(-1, -1, 1, 0, -1);
 401                 else
 402                 if (stick_right_y < -STICK_WALK_THRESHOLD)
 403                         set_joystick(-1, -1, 0, 1, -1);
 404                 else
 405                 if (stick_right_y_last > STICK_WALK_THRESHOLD || stick_right_y_last < -STICK_WALK_THRESHOLD)
 406                         set_joystick(-1, -1, 0, 0, -1);
 407                 /* thrust */
 408                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 409                         thrust = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD) * 10.5;
 410                 else
 411                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 412                         thrust = (stick_left_y - -STICK_THRUST_THRESHOLD) / (1.0 - -STICK_THRUST_THRESHOLD) * 10.5;
 413                 else
 414                         thrust = 0;
 415                 if (thrust >= 10)
 416                         thrust = KEYCODE_0;
 417                 else
 418                 if (thrust > 0)
 419                         thrust = KEYCODE_1 + thrust - 1;
 420                 else
 421                 if (thrust < 0)
 422                         thrust = KEYCODE_F1 - thrust - 1;
 423                 else
 424                 if (thrust <= -10)
 425                         thrust = KEYCODE_F10;
 426                 else
 427                         thrust = KEYCODE_SPACE;
 428                 if (thrust_last != thrust) {
 429                         set_amiga_key(thrust, 1);
 430                         set_amiga_key(thrust, 0);
 431                 }
 432         }
 433         button_a_last = button_a;
 434         button_b_last = button_b;
 435         button_x_last = button_x;
 436         button_y_last = button_y;
 437         button_menu_last = button_menu;
 438         button_trigger_last = button_trigger;
 439         button_left_thumb_last = button_left_thumb;
 440         button_right_thumb_last = button_right_thumb;
 441         stick_left_x_last = stick_left_x;
 442         stick_left_y_last = stick_left_y;
 443         stick_right_x_last = stick_right_x;
 444         stick_right_y_last = stick_right_y;
 445         thrust_last = thrust;
 446
 447         /* we must handle keyboard after toggeling keyboard_on,
 448          * so that keyboard_on will not change until keyboard is rendered */
 449         vr_key = 0;
 450         if (keyboard_on)
 451                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 452
 453         if (stick_right_y > STICK_WALK_THRESHOLD || stick_right_y < -STICK_WALK_THRESHOLD) {
 454                 double roll, pitch, yaw;
 455                 double dist, east, north;
 456                 int32_t move_east[4], move_north[4];
 457
 458                 mercenary_get_orientation(&roll, &pitch, &yaw);
 459                 /* we use a maximum move of 40 for all 4 steps (this is 10 for each step - equal to 'running') */
 460                 if (stick_right_y > 0.0)
 461                         dist = (stick_right_y - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 462                 else
 463                         dist = (stick_right_y + STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 464                 east = sin(hand_right_yaw + yaw + M_PI) * dist;
 465                 north = -cos(hand_right_yaw + yaw + M_PI) * dist;
 466                 /* calculatate the integer positions of 4 steps */
 467                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 468                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 469                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 470                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 471                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 472                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 473                 move_east[3] = (int32_t)(east + 0.5);
 474                 move_north[3] = (int32_t)(north + 0.5);
 475                 /* calculate the delta between each of the 4 step */
 476                 move_east[3] -= move_east[2];
 477                 move_north[3] -= move_north[2];
 478                 move_east[2] -= move_east[1];
 479                 move_north[2] -= move_north[1];
 480                 move_east[1] -= move_east[0];
 481                 move_north[1] -= move_north[0];
 482                 /* the game takes 4 steps to move the player */
 483                 mercenary_vr_move(1, move_east, move_north,
 484                         256,
 485                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 486         } else {
 487                 /* don't change what the game actually does when moving joystick in y-direction */
 488                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 489         }
 490 }
 491 #endif
 492
 493 static void skip_intro(void)
 494 {
 495         int event;
 496         double render_delay = 0.0;
 497         double cycle_count;
 498
 499         if (intro_skipped)
 500                 return;
 501
 502         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 503         do {
 504                 /* render, if not delayed */
 505                 if (render_delay <= 0.0) {
 506                         cycle_count = 0;
 507                         do {
 508                                 cycle_count += execute_cpu(0, &event);
 509                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 510                         render_delay += (double)cycle_count / CPU_SPEED;
 511                 }
 512                 /* VBL */
 513                 execute_cpu(3, NULL);
 514                 /* count down render delay */
 515                 if (render_delay) {
 516                         render_delay -= 1.0 / (double)IRQ_RATE;
 517                         if (render_delay < 0.0)
 518                                 render_delay = 0.0;
 519                 }
 520         } while (event != STOP_AT_CLEAR_SCREEN1);
 521
 522         intro_skipped = 1;
 523 }
 524
 525 static void special_event(int event)
 526 {
 527 #ifdef HAVE_OVR
 528         /* handle VR events */
 529         if (event == STOP_AT_PATCH_VR) {
 530                 mercenary_patch_vr();
 531                 return;
 532         }
 533 #endif
 534         /* handle events to improve rendering */
 535         if (render_improved)
 536                 render_capture_event(event);
 537 }
 538
 539 static void main_loop(void)
 540 {
 541         double frame_step, frame_time = 0.0, frame_render = 1;
 542         int had_first_irq = 0;
 543         static uint32_t current_time, last_time = 0, diff;
 544         int i, rc;
 545         int space, length;
 546         int cycle_count, event = STOP_AT_END;
 547         double render_delay = 0.0;
 548         uint32_t palette_address;
 549         uint16_t palette[16];
 550 #ifdef HAVE_OVR
 551         int eye;
 552 #endif
 553
 554         last_time = ticks_sdl();
 555
 556         /* render result on window */
 557         while (!quit) {
 558 #ifdef HAVE_OVR
 559                 /* get vr poses */
 560                 handle_vr_poses();
 561 #endif
 562                 /* if we are in interstellar fligt, we use 50 Hz */
 563                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 564                 /* else we use whatever frame rate the user wants */
 565                 if (render_capture_is_interstellar())
 566                         frame_step = vbl_duration * 50.0;
 567                 else if (!intro_skipped)
 568                         frame_step = vbl_duration * 10.0;
 569                 else
 570                         frame_step = vbl_duration * config_fps;
 571                 if (frame_step > 1.0)
 572                         frame_step = 1.0;
 573                 /* handle SDL events */
 574                 rc = event_sdl();
 575                 if (rc)
 576                         break;
 577
 578                 /* initialize rendering */
 579                 debug_opengl = config_debug_opengl;
 580                 benson_size = config_benson_size;
 581                 render_legacy = (!config_render) || debug_opengl;
 582                 render_improved = config_render || debug_opengl;
 583                 if (!render_improved) {
 584                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 585                         render_capture_reset();
 586                 }
 587                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 588                 /* amgia speed: don't render if we still delay */
 589                 /* non amiga speed: render if we need a new frame */
 590                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 591                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 592                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 593                 if (((frame_render && !config_amiga_speed)
 594                   || (config_amiga_speed && render_delay <= 0.0)
 595                   || event == STOP_AT_WAIT_INPUT)
 596                 && !(had_first_irq && help_view)) {
 597                         frame_render = 0;
 598                         /* start capturing for improved graphics */
 599                         if (render_improved)
 600                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
 601
 602                         /* execute until the rendered image is ready (wait for VBL) */
 603                         cycle_count = 0;
 604                         do {
 605                                 cycle_count += execute_cpu(0, &event);
 606                                 /* handle special events */
 607                                 special_event(event);
 608                                 if (event == STOP_AT_CLEAR_SCREEN1)
 609                                         intro_skipped = 1;
 610                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 611                         /* stop capturing for improved graphics */
 612                         if (render_improved)
 613                                 render_capture_stop();
 614                         /* copy palette */
 615                         palette_address = mercenary_palette_view();
 616                         for (i = 0; i < 16; i++)
 617                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 618                         /* for amiga speed: set delay by the number of cycles */
 619                         if (config_amiga_speed)
 620                                 render_delay += (double)cycle_count / CPU_SPEED;
 621                 }
 622
 623                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 624 #ifdef HAVE_OVR
 625                 begin_render_ovr();
 626
 627                 for (eye = 0; eye < 2; eye++) {
 628                         double camera_x, camera_y, camera_z;
 629                         /* begin of rendering eye, viewport and frustum is set here */
 630                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 631 #else
 632                 {
 633 #endif
 634                         /* clear screen */
 635 #ifdef HAVE_OVR
 636                         opengl_clear(1);
 637 #else
 638                         opengl_clear(0);
 639 #endif
 640                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 641                         if (render_improved) {
 642 #ifndef HAVE_OVR
 643                                 /* viewport and frustum is set here */
 644                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 645 #endif
 646                                 /* render improved graphics, interpolate, if required,
 647                                  * if no item list is available, for legacy rendering
 648                                  */
 649 #ifdef HAVE_OVR
 650                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 651 #else
 652                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 653 #endif
 654                                 if (rc)
 655                                         goto goto_legacy;
 656 #ifdef HAVE_OVR
 657                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 1, config_fov, config_monitor_distance, benson_size, 1);
 658 #else
 659                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 1, config_fov, config_monitor_distance, benson_size, 0);
 660 #endif
 661                                 if (help_view)
 662                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 1.0, 1.0, 0.0, 0.0);
 663                                 if (osd_timer) {
 664                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 0.5, 0.04, 0.5, -0.95);
 665                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 666                                                 osd_timer = 0;
 667                                 }
 668                         }
 669                         /* setup viewport for legacy image and render image, if enabled */
 670                         /* also render legacy, if render_improved failed due to not (yet) available items */
 671                         if (render_legacy) {
 672                                 goto_legacy:
 673                                 /* render game view without benson
 674                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 675                                  */
 676                                 if (had_first_irq)
 677                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 678 #ifndef HAVE_OVR
 679                                 /* viewport and frustum is set here */
 680                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 681 #endif
 682                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, config_fov, config_monitor_distance, 1.0, 0);
 683                                 if (help_view)
 684                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 685                                 if (osd_timer) {
 686                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 687                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 688                                                 osd_timer = 0;
 689                                 }
 690                         }
 691 #ifdef HAVE_OVR
 692                         /* render keyboard */
 693                         if (keyboard_on)
 694                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 695
 696                         /* end of rendering eye */
 697                         end_render_ovr_eye(eye);
 698                 }
 699                 /* at this point we are ready with our image, so we display */
 700                 end_render_ovr();
 701                 render_mirror_ovr(window_width, window_height);
 702 #else
 703                 }
 704 #endif
 705                 swap_sdl();
 706
 707                 /* advance frame time, if we are not in help view  */
 708                 if (!(had_first_irq && help_view)) {
 709                         frame_time += frame_step;
 710                         if (frame_time >= 1.0) {
 711                                 frame_time -= 1.0;
 712                                 frame_render = 1;
 713                         }
 714                 }
 715
 716                 /* measure frame rate */
 717                 framerate_measure();
 718
 719                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 720                 /* only do this, if we are not in help view */
 721                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 722                 if (!(had_first_irq && help_view)) {
 723                         current_time = ticks_sdl();
 724                         diff = current_time - last_time;
 725                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 726                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 727                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 728                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 729                         }
 730                         while (diff > 1000 / IRQ_RATE) {
 731                                 /* trigger and execute IRQ 3 = VBL */
 732                                 execute_cpu(3, NULL);
 733                                 had_first_irq = 1;
 734                                 /* transfer benson without game view
 735                                  * because we only got benson refreshed during VBL IRQ
 736                                  */
 737                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 738                                 /* render sound to sound buffer
 739                                  * buffer pointer read and write is atomic, so no locking required!
 740                                  */
 741                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 742                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 743 #ifdef DEBUG_SOUND_BUFFERING
 744                                         fprintf(stderr, "sound buffer overflow\n");
 745 #endif
 746                                         length = space;
 747                                 } else
 748                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 749 #ifdef DEBUG_SOUND_BUFFERING
 750                                 printf("can write %d, write %d\n", space, length);
 751                                 static int cnt = 0;
 752                                 int s;
 753                                 for (s = 0; s < length; s++) {
 754                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 755                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 756                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 757                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 758                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 759                                          cnt++;
 760                                 }
 761 #else
 762                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 763 #endif
 764                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 765                                 diff -= 1000 / IRQ_RATE;
 766                                 last_time += 1000 / IRQ_RATE;
 767
 768                                 /* count down render delay */
 769                                 if (render_delay) {
 770                                         render_delay -= 1.0 / (double)IRQ_RATE;
 771                                         if (render_delay < 0.0)
 772                                                 render_delay = 0.0;
 773                                 }
 774                         }
 775                 }
 776         }
 777 }
 778
 779 static uint16_t io_read(uint32_t address)
 780 {
 781         uint16_t value = 0xffff;
 782
 783         /* joystick and fire button */
 784         if (address == 0xbfe000 || address == 0xdff00c)
 785                 value &= emulate_joystick_read(address);
 786         /* keyboard */
 787         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 788                 value &= emulate_keyboard_read(address);
 789         /* diskette */
 790         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 791                 value &= emulate_disk_read(address);
 792
 793         return value;
 794 }
 795
 796 static void io_write(uint32_t address, uint16_t value)
 797 {
 798         /* dmacon and sound registers */
 799         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 800                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 801         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 802                 emulate_disk_write(address, value);
 803 }
 804
 805 /* two tracks with 0x1820 words of length */
 806 static uint8_t game_save[2][0x1820 << 1];
 807 static int last_track = 0;
 808
 809 /* game reads track with saved game */
 810 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 811 {
 812         if (length > sizeof(game_save[0])) {
 813                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 814                 return;
 815         }
 816
 817         /* if even track is selected, load game */
 818         if (!(track & 1)) {
 819                 char filename[256];
 820                 int gamesave_num = (track - 2) >> 1;
 821                 int got;
 822                 FILE *fp;
 823
 824                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 825 #if defined(_WIN32)
 826                 filename[0] = '\0';
 827 #else
 828                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 829                 mkdir(filename, 0777);
 830 #endif
 831                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 832                 fp = fopen(filename, "r");
 833                 if (!fp) {
 834 fail:
 835                         print_info("failed to load game from '%s'\n", filename);
 836                         goto copy;
 837                 }
 838                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 839                 fclose(fp);
 840                 if (got != 2)
 841                         goto fail;
 842         }
 843
 844 copy:
 845         /* copy track */
 846         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 847 }
 848
 849 /* game writes track with saved game */
 850 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 851 {
 852         /* skip sync info that is provided by game and only relevant for a real disk track */
 853         data += 0x200;
 854         length -= 0x200;
 855
 856         if (length != sizeof(game_save[0])) {
 857                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 858                 return;
 859         }
 860
 861         /* don't save if last track is the same, because disk is written on both sides with the same data */
 862         if (track == last_track) {
 863                 if (memcmp(memory + data, game_save[track & 1], length)) {
 864                         print_error("saving game data on other side of the disk is different, please fix!\n");
 865                 }
 866                 return;
 867         }
 868         last_track = track;
 869
 870         /* save game data */
 871         memcpy(game_save[track & 1], memory + data, length);
 872
 873         /* if done with saving */
 874         if ((track & 1)) {
 875                 char filename[256];
 876                 int gamesave_num = (track - 2) >> 1;
 877                 int wrote;
 878                 FILE *fp;
 879
 880 #if defined(_WIN32)
 881                 filename[0] = '\0';
 882 #else
 883                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 884                 mkdir(filename, 0777);
 885 #endif
 886                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 887                 fp = fopen(filename, "w");
 888                 if (!fp) {
 889 fail:
 890                         print_error("failed to save game to '%s'\n", filename);
 891                         return;
 892                 }
 893                 print_info("Game state saved to '%s'\n", filename);
 894                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 895                 fclose(fp);
 896                 if (wrote != 2)
 897                         goto fail;
 898         }
 899 }
 900
 901 static int shift = 0, ctrl = 0;
 902
 903 static void keyboard_sdl(int down, enum keycode keycode)
 904 {
 905         switch (keycode) {
 906         case KEYCODE_LCTRL:
 907         case KEYCODE_RCTRL:
 908                 ctrl = down;
 909                 break;
 910         default: break;
 911         }
 912
 913         if (ctrl && down) {
 914                 switch (keycode) {
 915                 case KEYCODE_h:
 916                         if (help_view == help_views)
 917                                 help_view = 0;
 918                         else
 919                                 help_view++;
 920                         break;
 921                 case KEYCODE_v:
 922                         config_video_filter ^= 1;
 923                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 924                         break;
 925                 case KEYCODE_a:
 926                         config_audio_filter ^= 1;
 927                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 928                         break;
 929                 case KEYCODE_s:
 930                         config_amiga_speed ^= 1;
 931                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 932                         break;
 933                 case KEYCODE_r:
 934                         config_render ^= 1;
 935                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 936                         break;
 937                 case KEYCODE_b:
 938                         if (!config_render && !config_debug_opengl) {
 939                                 osd_info("", "not applicable");
 940                                 break;
 941                         }
 942                         if (config_benson_size == 0.5) {
 943                                 config_benson_size = 1.0;
 944                                 config_fov = FOV_NOVAGEN;
 945                         } else {
 946                                 config_benson_size = 0.5;
 947                                 config_fov = FOV_JOLLY;
 948                         }
 949                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 950                         break;
 951                 case KEYCODE_i:
 952                         if (!intro_skipped)
 953                                 skip_intro();
 954                         else
 955                                 osd_info("", "not applicable");
 956                         break;
 957                 case KEYCODE_c:
 958                         if (config_ctrl_c)
 959                                 quit = 1;
 960                         break;
 961                 case KEYCODE_o:
 962 #ifdef HAVE_OVR
 963                         normalize_observer_ovr();
 964                         osd_info("", "change height");
 965 #else
 966                         osd_info("", "not applicable");
 967 #endif
 968                         break;
 969                 case KEYCODE_KP_PLUS:
 970                         if (config_fov / 1.2 >= FOV_MIN)
 971                                 config_fov /= 1.2;
 972                         disp_fov:
 973                         {
 974                                 char text[16];
 975                                 sprintf(text, "%.2f", config_fov);
 976                                 osd_info("FOV", text);
 977                         }
 978                         break;
 979                 case KEYCODE_KP_MINUS:
 980                         if (config_fov * 1.2 <= FOV_MAX)
 981                                 config_fov *= 1.2;
 982                         goto disp_fov;
 983                 default: break;
 984                 }
 985                 /* do not pass keys to game while holding CTRL */
 986                 return;
 987         }
 988
 989         if (keycode == KEYCODE_PAUSE && down) {
 990                 if (help_view == help_views)
 991                         help_view = 0;
 992                 else
 993                         help_view++;
 994         }
 995
 996         /* in help view we must not forward keypresses */
 997         if (help_view)
 998                 return;
 999
1000         switch (keycode) {
1001         case KEYCODE_LSHIFT:
1002                 set_amiga_key(keycode, down);
1003                 shift = down;
1004                 break;
1005         case KEYCODE_RSHIFT:
1006                 set_amiga_key(keycode, down);
1007                 shift = down;
1008                 break;
1009         case KEYCODE_LEFT:
1010                 if (shift && down) {
1011                         set_amiga_key(keycode, down);
1012                         set_joystick(-1, -1, -1, -1, -1);
1013                         break;
1014                 }
1015                 set_amiga_key(keycode, 0);
1016                 set_joystick(down, -1, -1, -1, -1);
1017                 break;
1018         case KEYCODE_RIGHT:
1019                 if (shift && down) {
1020                         set_amiga_key(keycode, down);
1021                         set_joystick(-1, -1, -1, -1, -1);
1022                         break;
1023                 }
1024                 set_amiga_key(keycode, 0);
1025                 set_joystick(-1, down, -1, -1, -1);
1026                 break;
1027         case KEYCODE_UP:
1028                 if (shift && down) {
1029                         set_amiga_key(keycode, down);
1030                         set_joystick(-1, -1, -1, -1, -1);
1031                         break;
1032                 }
1033                 set_amiga_key(keycode, 0);
1034                 set_joystick(-1, -1, down, -1, -1);
1035                 break;
1036         case KEYCODE_DOWN:
1037                 if (shift && down) {
1038                         set_amiga_key(keycode, down);
1039                         set_joystick(-1, -1, -1, -1, -1);
1040                         break;
1041                 }
1042                 set_amiga_key(keycode, 0);
1043                 set_joystick(-1, -1, -1, down, -1);
1044                 break;
1045         case KEYCODE_END:
1046                 set_joystick(-1, -1, -1, -1, down);
1047                 break;
1048         case KEYCODE_INSERT:
1049                 set_amiga_key(KEYCODE_HELP, down);
1050                 break;
1051         default:
1052                 set_amiga_key(keycode, down);
1053         }
1054 }
1055
1056 void audio_sdl(float *data, int length)
1057 {
1058         int fill, s;
1059
1060         /* read sound from sound buffer
1061          * buffer pointer read and write is atomic, so no locking required!
1062          */
1063         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1064         if (fill < length) {
1065 #ifdef DEBUG_SOUND_BUFFERING
1066                 fprintf(stderr, "sound buffer underrun\n");
1067 #endif
1068                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1069                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1070         }
1071         for (s = 0; s < length; s++) {
1072                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1073                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1074         }
1075 #ifdef DEBUG_SOUND_BUFFERING
1076         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1077 #endif
1078         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1079 }
1080
1081 void sound_irq(void)
1082 {
1083         /* trigger and execute IRQ 4 = sound */
1084         execute_cpu(4, NULL);
1085 }
1086
1087 int main(int argc, char *argv[])
1088 {
1089         int rc;
1090         int sdl_sound_chunk;
1091
1092         home_dir = getenv("HOME");
1093         if (!home_dir)
1094                 home_dir = "";
1095
1096         rc = parse_args(argc, argv);
1097         if (rc)
1098                 return 0;
1099
1100         /* allocate image */
1101         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1102         if (!image) {
1103                 print_error("Failed to allocate image buffer\n");
1104                 goto done;
1105         }
1106
1107         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1108                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1109                 goto done;
1110         }
1111         if ((1000 % IRQ_RATE)) {
1112                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1113                 goto done;
1114         }
1115
1116         /* calculate SDL chunk size for audio
1117          * it must be a power of two, but not more than the chunk size for each IRQ!
1118          */
1119         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1120                 ;
1121         sdl_sound_chunk >>= 1;
1122 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1123
1124         /* allocate sound buffers */
1125         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1126         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1127         if (!sound_buffer) {
1128                 print_error("Failed to allocate image buffer\n");
1129                 goto done;
1130         }
1131
1132         /* allocate memory */
1133         memory = calloc(MEMORY_SIZE, 1);
1134         if (!memory) {
1135                 print_error("Failed to allocate cpu's memory\n");
1136                 goto done;
1137         }
1138         stop_event = calloc(MEMORY_SIZE, 1);
1139         if (!stop_event) {
1140                 print_error("Failed to allocate cpu's stop_event memory\n");
1141                 goto done;
1142         }
1143         chipreg = calloc(IOSIZE, 1);
1144         if (!chipreg) {
1145                 print_error("Failed to allocate chip register\n");
1146                 goto done;
1147         }
1148
1149         /* init cpu code */
1150         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1151
1152         /* init disk emulation */
1153         disk_init(disk_read, disk_write);
1154
1155         /* load binary */
1156         mercenary_load();
1157
1158         /* patch some stuff */
1159         mercenary_patch();
1160
1161         /* init SDL and OpenGL */
1162 #ifdef HAVE_OVR
1163         int vbl_sync = 0;
1164         int rift = 1;
1165         int multisampling = 0;
1166         window_width = SCREEN_WIDTH;
1167         window_height = SCREEN_HEIGHT;
1168 #else
1169         int vbl_sync = 1;
1170         int rift = 0;
1171         int multisampling = config_multisampling;
1172         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1173         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1174 #endif
1175         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1176         if (rc < 0)
1177                 goto done;
1178 #ifdef HAVE_OVR
1179         rc = init_ovr(config_multisampling);
1180         if (rc < 0)
1181                 goto done;
1182         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1183         if (rc < 0)
1184                 goto done;
1185 #endif
1186         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1187         if (rc < 0)
1188                 goto done;
1189
1190         /* init osd */
1191         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1192         if (rc < 0)
1193                 goto done;
1194         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1195         if (rc < 0)
1196                 goto done;
1197         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1198         if (!help_osd[0])
1199                 goto done;
1200         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1201         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1202                 "Emulation:\n"
1203                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1204                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1205                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1206                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1207                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1208                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1209                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1210                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1211                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1212 #ifdef HAVE_OVR
1213                 "        Press `CTRL' + `O' (or right trigger) to reset observer position.\n"
1214 #endif
1215                 "\n"
1216                 "Answer to a Question:\n"
1217                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1218                 "\n"
1219                 "Walking / Driving / Flying:\n"
1220                 "        Use cursor keys as joystick, to move player / craft.\n"
1221                 "        Press `R' for running, 'W' for walking speed.\n"
1222                 "        Press `B' to board, `L' to leave.\n"
1223                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1224                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1225                 "        Press `SPACE' to stop craft.\n"
1226                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1227                 "        Press `T' for turbo on certain craft.\n"
1228                 "        Press `END' as joystick's fire button.\n"
1229                 "\n"
1230                 "Elevator:\n"
1231                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1232                 "\n"
1233                 "Inside a transporter:\n"
1234                 "        Press `1'...`0' to select destination.\n"
1235                 "\n"
1236                 "Items:\n"
1237                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1238                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1239                 "        Press `NUMPAD Enter' to select certain items.\n"
1240                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1241                 "        Press `NUMPAD *' to read entry\n"
1242                 "Saving / Loading / Pause:\n"
1243                 "        Press `INSERT' to loading and saving options.\n"
1244                 "        Press `ENTER' to pause game, other key to continue.\n"
1245                 ,HELP_ALPHA, 1, 2, 5, 0);
1246 #ifdef HAVE_OVR
1247         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1248         if (!help_osd[1])
1249                 goto done;
1250         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1251         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1252                 "Emulation using Controller:\n"
1253                 "        Press `Enter' button to toggle this help screen on or off.\n"
1254                 "        Press `A' button to emulate keyboard to control game.\n"
1255                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1256                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1257                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1258                 "        Press `Trigger' on right controller enter the highlighted key.\n"
1259                 "\n"
1260                 "Walking / Driving / Flying using Controller:\n"
1261                 "        Use thumb stick on right controller, to move player / craft.\n"
1262                 "        Press `X' button to board, `Y' button to leave.\n"
1263                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1264                 "        Press and hold thumb stick on left controller for escape sequence.\n"
1265                 "        Release thumb stick on left controller stop craft.\n"
1266                 "        Press `Trigger' on right controller to fire.\n"
1267                 "\n"
1268                 "For all other game function, use the emulated keyboards!\n"
1269                 ,HELP_ALPHA, 1, 2, 5, 0);
1270         help_views = 2;
1271 #endif
1272         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1273         if (!info_osd)
1274                 goto done;
1275
1276         /* init audio */
1277         sound_init(SOUND_SAMPLERATE, sound_irq);
1278
1279         /* start cpu */
1280         reset_cpu();
1281
1282         if (config_skip_intro)
1283                 skip_intro();
1284
1285         /* run game */
1286         main_loop();
1287
1288 done:
1289         exit_opengl();
1290 #ifdef HAVE_OVR
1291         exit_ovr();
1292 #endif
1293         exit_sdl();
1294
1295         if (chipreg)
1296                 free(chipreg);
1297         if (stop_event)
1298                 free(stop_event);
1299         if (memory)
1300                 free(memory);
1301         if (sound_buffer)
1302                 free(sound_buffer);
1303         if (image)
1304                 free(image);
1305         if (help_osd[0])
1306                 free(help_osd[0]);
1307         if (help_osd[1])
1308                 free(help_osd[1]);
1309         if (info_osd)
1310                 free(info_osd);
1311
1312         return 0;
1313 }
1314