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 "../libopengl/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 0.1 /* 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 = 10.0;
  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 int config_joystick = -1, config_joystick_x = -1, config_joystick_y = -1, config_joystick_fire = -1;
  68 #ifdef HAVE_OVR
  69 static double config_benson_size = 0.7;
  70 static double config_fov = FOV_JOLLY;
  71 #else
  72 static double config_benson_size = 1.0;
  73 static double config_fov = FOV_NOVAGEN;
  74 #endif
  75 static double config_monitor_distance = 41.5; /* inch */
  76 #ifdef HAVE_OVR
  77 static double config_keyboard_distance = 38.5; /* inch */
  78 static double config_keyboard_height = -26.0; /* inch */
  79 #endif
  80 static int config_debug_transparent = 0;
  81 static int config_debug_opengl = 0;
  82 /* render improvements */
  83 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  84 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  85 static int config_improve_stars_rotation = 1;   /* set to 1 to improve star rendering */
  86 static int config_improve_fix_sky_rotation = 0; /* set to 1 to fix sky rotation */
  87 static int config_improve_round_planets = 0;    /* set to 1 to make planets exactly round */
  88
  89 #define CPU_SPEED       7093790.0;
  90
  91 #define SOUND_SAMPLERATE 48000
  92 /* - game IRQ rate
  93  * - must be used for sound rendering chunk
  94  */
  95 #define IRQ_RATE        50
  96 /* numbe of buffer chunks to dejitter:
  97  * - SDL render interval
  98  * - sound rendering interval
  99  * - sound card interval
 100  * 4 should be minimum, if video rate is >=50 Hz
 101  */
 102 #define SOUND_CHUNKS    4
 103
 104 /* test sound to check if buffer does not overflow / underrun */
 105 //#define DEBUG_SOUND_BUFFERING
 106
 107 #define IOSIZE          0x1000 /* bytes in io space */
 108 #define MEMORY_SIZE     0x80000
 109 static uint8_t *memory = NULL;
 110 static uint8_t *stop_event = NULL;
 111 static uint8_t *image = NULL;
 112 static uint8_t *help_osd[3] = { NULL, NULL, NULL };
 113 static uint8_t *info_osd = NULL;
 114 static int help_view = 1;
 115 static int help_views = 0;
 116 static int32_t osd_timer = 0, border_timer = 0;
 117 #ifdef HAVE_OVR
 118 #define SCREEN_WIDTH    1344
 119 #define SCREEN_HEIGHT   800
 120 #else
 121 #define SCREEN_WIDTH    (320*3)
 122 #define SCREEN_HEIGHT   (200*3)
 123 #endif
 124 #define IMAGE_WIDTH     320
 125 #define IMAGE_HEIGHT    200
 126 #define BENSON_AT_LINE  136
 127 #define IMAGE_DIWSTART  0x2c
 128 #define HELP_ALPHA      0xd0
 129 #define OSD_WIDTH       320
 130 #define OSD_HEIGHT      16
 131 static uint16_t *chipreg = NULL;
 132 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 133 static int sound_buffer_size; /* buffer sample size */
 134 static int sound_buffer_writep; /* write pointer at buffer */
 135 static int sound_buffer_readp; /* read pointer at buffer */
 136 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 137 static double benson_size; /* render size of benson */
 138 static int render_legacy = 0; /* render original amiga screen, if set */
 139 static int render_improved = 0; /* render improved image, if set */
 140 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 141 static int intro_skipped = 0; /* indicated if we already have landed */
 142 static int window_width, window_height;
 143 static int mission_disk = 0;
 144
 145 static const char *home_dir;
 146
 147 static int quit = 0;
 148
 149 int parse_args(int argc, char *argv[])
 150 {
 151         int i = 1;
 152
 153         while (argc > i) {
 154                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 155                         /*          |                                                                             | */
 156                         print_info("Usage: %s\n", argv[0]);
 157                         print_info(" -s --render-speed original | fast\n");
 158                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 159                         print_info("    --fps <fps>\n");
 160                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 161                         print_info(" -v --video-filter on | off\n");
 162                         print_info("        Set video filter.\n");
 163                         print_info(" -a --audio-filter on | off\n");
 164                         print_info("        Set audio filter.\n");
 165                         print_info(" -r --render original | opengl\n");
 166                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 167                         print_info(" -b --benson normal | half\n");
 168                         print_info("        Size of 'Benson' (control panel).\n");
 169                         print_info(" -m --multisampling <samples>\n");
 170                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 171                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 172                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 173                         print_info(" -i --skip-intro\n");
 174                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 175                         print_info(" -j --joystick <num> | list\n");
 176                         print_info("        Select given joystick number or show list. (default = 0, if available)\n");
 177                         print_info("    --joystick-x <axis num>\n");
 178                         print_info("    --joystick-y <axis num>\n");
 179                         print_info("    --joystick-fire <button num>\n");
 180                         print_info("        Specify explicit axis and button of joystick.\n");
 181                         print_info("Improvement options:\n");
 182                         print_info("    --extend-roads 1 | 0\n");
 183                         print_info("        Roads in the distance end in a single point. This was ok for low\n");
 184                         print_info("        resolution, but for OpenGL we want equal width all the way.\n");
 185                         print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
 186                         print_info("    --smooth-planets 1 | 0\n");
 187                         print_info("        Planet's rotation uses integer value, so they judder in the original\n");
 188                         print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
 189                         print_info("    --stars-rotation 1 | 0\n");
 190                         print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
 191                         print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
 192                         print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
 193                         print_info("    --fix-sky-rotation 1 | 0\n");
 194                         print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
 195                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 196                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 197                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
 198                         print_info("    --round-planets 1 | 0\n");
 199                         print_info("        The original game renders planets and explosion debris horizontally\n");
 200                         print_info("        stretched. This compensates the vertical stretch of NTSC vs PAL video.\n");
 201                         print_info("        The original (stretched) sphere makes the game authentic.\n");
 202                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_round_planets);
 203                         print_info("Debug options:\n");
 204                         print_info(" -o --debug-opengl\n");
 205                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 206                         print_info("    --debug-transparent\n");
 207                         print_info("        Draw all things half transparent.\n");
 208                         print_info("    --ctrl-c\n");
 209                         print_info("        Use CTRL+C to exit game (used for development)\n");
 210                         return -1;
 211                 } else
 212                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 213                         i++;
 214                         if (argc == i) {
 215 missing_parameter:
 216                                 print_info("Missing parameter, use '--help'!\n");
 217                                 return -1;
 218                         }
 219                         if (!strcmp(argv[i], "original"))
 220                                 config_amiga_speed = 1;
 221                         else
 222                         if (!strcmp(argv[i], "fast"))
 223                                 config_amiga_speed = 0;
 224                         else {
 225 illegal_parameter:
 226                                 print_info("Illegal parameter, use '--help'!\n");
 227                                 return -1;
 228                         }
 229                 } else
 230                 if (!strcmp(argv[i], "--fps")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         config_fps = atof(argv[i]);
 235                         if (config_fov <= 0.0)
 236                                 goto illegal_parameter;
 237                 } else
 238                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 239                         i++;
 240                         if (argc == i)
 241                                 goto missing_parameter;
 242                         if (!strcmp(argv[i], "on"))
 243                                 config_video_filter = 1;
 244                         else
 245                         if (!strcmp(argv[i], "off"))
 246                                 config_video_filter = 0;
 247                         else
 248                                 goto illegal_parameter;
 249                 } else
 250                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 251                         i++;
 252                         if (argc == i)
 253                                 goto missing_parameter;
 254                         if (!strcmp(argv[i], "on"))
 255                                 config_audio_filter = 1;
 256                         else
 257                         if (!strcmp(argv[i], "off"))
 258                                 config_audio_filter = 0;
 259                         else
 260                                 goto illegal_parameter;
 261                 } else
 262                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 263                         i++;
 264                         if (argc == i)
 265                                 goto missing_parameter;
 266                         if (!strcmp(argv[i], "original"))
 267                                 config_render = 0;
 268                         else
 269                         if (!strcmp(argv[i], "opengl"))
 270                                 config_render = 1;
 271                         else
 272                                 goto illegal_parameter;
 273                 } else
 274                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 275                         i++;
 276                         if (argc == i)
 277                                 goto missing_parameter;
 278                         if (!strcmp(argv[i], "normal"))
 279                                 config_benson_size = 1.0;
 280                         else
 281                         if (!strcmp(argv[i], "half")) {
 282                                 config_benson_size = 0.5;
 283                                 if (config_fov == FOV_NOVAGEN)
 284                                         config_fov = FOV_JOLLY;
 285                         } else
 286                                 goto illegal_parameter;
 287                 } else
 288                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 289                         i++;
 290                         if (argc == i)
 291                                 goto missing_parameter;
 292                         config_multisampling = atoi(argv[i]);
 293                 } else
 294                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 295                         i++;
 296                         if (argc == i)
 297                                 goto missing_parameter;
 298                         config_fov = atof(argv[i]);
 299                         if (config_fov < 1.0 || config_fov > 179.0)
 300                                 goto illegal_parameter;
 301                 } else
 302                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 303                         config_skip_intro = 1;
 304                 } else
 305                 if (!strcmp(argv[i], "-j") || !strcmp(argv[i], "--joystick")) {
 306                         i++;
 307                         if (argc == i)
 308                                 goto missing_parameter;
 309                         if (!strcmp(argv[i], "list")) {
 310                                 sdl_list_joysticks();
 311                                 return 1;
 312                         }
 313                         config_joystick = atoi(argv[i]);
 314                 } else
 315                 if (!strcmp(argv[i], "--joystick-x")) {
 316                         i++;
 317                         if (argc == i)
 318                                 goto missing_parameter;
 319                         config_joystick_x = atoi(argv[i]);
 320                 } else
 321                 if (!strcmp(argv[i], "--joystick-y")) {
 322                         i++;
 323                         if (argc == i)
 324                                 goto missing_parameter;
 325                         config_joystick_y = atoi(argv[i]);
 326                 } else
 327                 if (!strcmp(argv[i], "--joystick-fire")) {
 328                         i++;
 329                         if (argc == i)
 330                                 goto missing_parameter;
 331                         config_joystick_fire = atoi(argv[i]);
 332                 } else
 333                 if (!strcmp(argv[i], "--extend-roads")) {
 334                         i++;
 335                         if (argc == i)
 336                                 goto missing_parameter;
 337                         config_improve_extend_roads = atoi(argv[i]);
 338                 } else
 339                 if (!strcmp(argv[i], "--smooth-planets")) {
 340                         i++;
 341                         if (argc == i)
 342                                 goto missing_parameter;
 343                         config_improve_smooth_planets = atoi(argv[i]);
 344                 } else
 345                 if (!strcmp(argv[i], "--stars-rotation")) {
 346                         i++;
 347                         if (argc == i)
 348                                 goto missing_parameter;
 349                         config_improve_stars_rotation = atoi(argv[i]);
 350                 } else
 351                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 352                         i++;
 353                         if (argc == i)
 354                                 goto missing_parameter;
 355                         config_improve_fix_sky_rotation = atoi(argv[i]);
 356                 } else
 357                 if (!strcmp(argv[i], "--round-planets")) {
 358                         i++;
 359                         if (argc == i)
 360                                 goto missing_parameter;
 361                         config_improve_round_planets = atoi(argv[i]);
 362                 } else
 363                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 364                         config_debug_opengl = 1;
 365                 } else
 366                 if (!strcmp(argv[i], "--debug-transparent")) {
 367                         config_debug_transparent = 1;
 368                 } else
 369                 if (!strcmp(argv[i], "--ctrl-c")) {
 370                         config_ctrl_c = 1;
 371                 } else {
 372                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 373                         return -1;
 374                 }
 375                 i++;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static void osd_info(const char *param, const char *value)
 382 {
 383         char line[41] = "                                        ";
 384
 385         if (param[0]) {
 386                 strncpy(line + 21 - strlen(param), param, strlen(param));
 387                 line[22] = ':';
 388         }
 389         if (strlen(value) > 15) {
 390                 print_error("string too long\n");
 391                 return;
 392         }
 393         strncpy(line + 25, value, strlen(value));
 394         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 395         osd_timer = ticks_sdl() + 2500;
 396 }
 397
 398 static void toggle_help(void)
 399 {
 400         if (help_view == 0)
 401                 help_view = 2;
 402         else
 403         if (help_view == help_views)
 404                 help_view = 0;
 405         else
 406                 help_view++;
 407 }
 408
 409 static void resize_window(int width, int height)
 410 {
 411         window_width = width;
 412         window_height = height;
 413         border_timer = ticks_sdl() + 1500;
 414         osd_info("", "window resized");
 415 }
 416
 417 #ifdef HAVE_OVR
 418 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_left_trigger_last = 0, button_right_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 419 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;
 420 static int thrust_last = 0;
 421 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 422 static int keyboard_on = 0;
 423 static enum keycode vr_key_pressed = 0, vr_key = 0;
 424 static int we_walk = 0, we_rotate = 0;
 425 static double degrees45 = 45.0 / 180.0 * M_PI;
 426
 427 static void handle_vr_poses(void)
 428 {
 429         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_left_trigger = 0, button_right_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 430         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 431         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 432         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 433         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 434         int thrust = thrust_last;
 435         int joystick_set_x = 0, joystick_set_y = 0;
 436         static uint32_t current_time, last_time = 0, diff;
 437         static double increment, inc_count = 0.0;
 438
 439         /* handle input */
 440         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_left_trigger, &button_right_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);
 441         if (button_a && !button_a_last) {
 442                 /* menu toggle */
 443                 toggle_help();
 444         }
 445         if (button_b && !button_b_last) {
 446                 /* reset observer */
 447                 reset_observer_ovr();
 448                 osd_info("", "reset observer");
 449         }
 450         if (button_x && !button_x_last) {
 451                 /* menu toggle */
 452                 toggle_help();
 453         }
 454         if (button_y && !button_y_last) {
 455                 /* reset observer */
 456                 reset_observer_ovr();
 457                 osd_info("", "reset observer");
 458         }
 459         if (!help_view) {
 460                 if (button_right_trigger && !button_right_trigger_last) {
 461                         /* trigger pressed */
 462                         if (keyboard_on) {
 463                                 if (vr_key) {
 464                                         vr_key_pressed = vr_key;
 465                                         set_amiga_key(vr_key_pressed, 1);
 466                                         /* reset vr thrust */
 467                                         thrust = 0;
 468                                 }
 469                         } else {
 470                                 /* fire button */
 471                                 set_joystick(-1, -1, -1, -1, 1);
 472                         }
 473                 }
 474                 if (!button_right_trigger && button_right_trigger_last) {
 475                         /* trigger released */
 476                         set_joystick(-1, -1, -1, -1, 0);
 477                         if (vr_key_pressed) {
 478                                 set_amiga_key(vr_key_pressed, 0);
 479                                 vr_key_pressed = 0;
 480                         }
 481                 }
 482                 /* joystick */
 483                 /* reset moving state, so the game is not influenced before we want to */
 484                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 485                 joystick_set_x = 0;
 486                 joystick_set_y = 0;
 487                 if (!mercenary_get_info_walking()) {
 488                         /* turn right and left when not walking */
 489                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 490                                 set_joystick(0, 1, -1, -1, -1);
 491                                 joystick_set_x = 1;
 492                         } else
 493                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 494                                 set_joystick(1, 0, -1, -1, -1);
 495                                 joystick_set_x = 1;
 496                         }
 497                         /* pitch craft */
 498                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 499                                 set_joystick(-1, -1, 1, 0, -1);
 500                                 joystick_set_y = 1;
 501                         } else
 502                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 503                                 set_joystick(-1, -1, 0, 1, -1);
 504                                 joystick_set_y = 1;
 505                         }
 506                         if (joystick_set_x || joystick_set_y) {
 507                                 mercenary_vr_move(0, NULL, NULL,
 508                                         256,
 509                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 510                         }
 511                 } else {
 512                         double roll, pitch, yaw;
 513                         double tilt, dir, east, north;
 514                         int32_t move_east[4], move_north[4];
 515
 516                         tilt = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 517
 518                         /* check if we rotate, walk or rest */
 519                         if (we_rotate == 0 && we_walk == 0) {
 520                                 /* we rest */
 521                                 if (fabs(stick_right_y) > fabs(stick_right_x) && tilt > STICK_WALK_THRESHOLD)
 522                                         we_walk = 1;
 523                                 if (fabs(stick_right_x) > fabs(stick_right_y) && tilt > STICK_ROTATE_THRESHOLD)
 524                                         we_rotate = 1;
 525                         } else if (we_walk) {
 526                                 /* we walk */
 527                                 if (tilt < STICK_WALK_THRESHOLD) {
 528                                         we_walk = 0;
 529                                         /* we need to stop right here and not continue until next rendering */
 530                                         set_joystick(-1, -1, 0, 0, -1); /* stop y */
 531                                         reset_joystick(); /* commit stop */
 532                                 }
 533                         } else {
 534                                 /* we rotate */
 535                                 if (tilt < STICK_ROTATE_THRESHOLD)
 536                                         we_rotate = 0;
 537                         }
 538
 539                         /* if we walk */
 540                         if (we_walk) {
 541                                 /* get stick amplitude (dist) and direction (dir) */
 542                                 if (tilt > 1.0)
 543                                         tilt = 1.0;
 544                                 tilt = (tilt - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 545                                 dir = atan2(stick_right_x, stick_right_y);
 546 #if 0
 547                                 /* use hand direction to get actual stick direction */
 548                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 549                                 if (dir < -M_PI)
 550                                         dir += M_PI * 2.0;
 551                                 if (dir > M_PI)
 552                                         dir -= M_PI * 2.0;
 553 #endif
 554                                 /* flip direction, if we walk backwards */
 555                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 556                                         /* go backwards */
 557                                         set_joystick(-1, -1, 0, 1, -1);
 558                                         joystick_set_y = 1;
 559                                 } else {
 560                                         /* go forward */
 561                                         set_joystick(-1, -1, 1, 0, -1);
 562                                         joystick_set_y = 1;
 563                                 }
 564                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 565                                 east = sin(yaw - dir + M_PI) * tilt;
 566                                 north = -cos(yaw - dir + M_PI) * tilt;
 567                                 /* calculatate the integer positions of 4 steps */
 568                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 569                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 570                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 571                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 572                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 573                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 574                                 move_east[3] = (int32_t)(east + 0.5);
 575                                 move_north[3] = (int32_t)(north + 0.5);
 576                                 /* calculate the delta between each of the 4 step */
 577                                 move_east[3] -= move_east[2];
 578                                 move_north[3] -= move_north[2];
 579                                 move_east[2] -= move_east[1];
 580                                 move_north[2] -= move_north[1];
 581                                 move_east[1] -= move_east[0];
 582                                 move_north[1] -= move_north[0];
 583                                 /* the game takes 4 steps to move the player */
 584                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 585                         }
 586
 587                         /* snap orientation to steps of 45 degrees */
 588                         if (we_rotate == 1) {
 589                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 590                                 yaw = round(yaw / degrees45) * degrees45;
 591                                 /* if we rotate: change orientation */
 592                                 if (stick_right_x > 0)
 593                                         yaw -= degrees45;
 594                                 else
 595                                         yaw += degrees45;
 596                                 /* rotate only once per stick movement */
 597                                 we_rotate = 2;
 598                                 mercenary_set_orientation(yaw);
 599                         }
 600                 }
 601                 if (joystick_set_x_last && !joystick_set_x)
 602                         set_joystick(0, 0, -1, -1, -1);
 603                 if (joystick_set_y_last && !joystick_set_y)
 604                         set_joystick(-1, -1, 0, 0, -1);
 605                 /* thrust */
 606                 /* button to toggle between stop and escape */
 607                 if (button_left_thumb && !button_left_thumb_last) {
 608                         /* 'escape' pressed */
 609                         if (thrust_last != -99)
 610                                 thrust = -99;
 611                         else
 612                                 thrust = 0;
 613                 }
 614                 /* button to stop */
 615                 if (button_left_trigger && !button_left_trigger_last) {
 616                         /* 'stop' pressed */
 617                         thrust = 0;
 618                 }
 619                 /* get stick to increment or decrement thrust */
 620                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 621                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 622                 else
 623                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 624                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 625                 else
 626                         increment = 0;
 627                 current_time = ticks_sdl();
 628                 if (increment) {
 629                         diff = current_time - last_time;
 630                         inc_count += increment * diff;
 631                         /* if we are in 'escape' mode, we stop thrust first */
 632                         if (thrust == -99)
 633                                 thrust = 0;
 634                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 635                                 thrust++;
 636                                 inc_count = 0.0;
 637                         }
 638                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 639                                 thrust--;
 640                                 inc_count = 0.0;
 641                         }
 642                 } else {
 643                         inc_count = 0;
 644                 }
 645                 last_time = current_time;
 646                 /* send thrust change as keycodes */
 647                 if (thrust_last != thrust) {
 648                         /* if we were in escape mode, we stop us first and then apply the new code */
 649                         if (thrust_last == -99) {
 650                                 set_amiga_key(KEYCODE_SPACE, 1);
 651                                 set_amiga_key(KEYCODE_SPACE, 0);
 652                         }
 653
 654                         if (thrust >= 10) {
 655                                 set_amiga_key(KEYCODE_0, 1);
 656                                 set_amiga_key(KEYCODE_0, 0);
 657                         } else
 658                         if (thrust <= -10 && thrust > -99) {
 659                                 set_amiga_key(KEYCODE_F10, 1);
 660                                 set_amiga_key(KEYCODE_F10, 0);
 661                         } else
 662                         if (thrust <= -99) {
 663                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 664                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 665                         } else
 666                         if (thrust > 0) {
 667                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 668                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 669                         } else
 670                         if (thrust < 0) {
 671                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 672                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 673                         } else {
 674                                 set_amiga_key(KEYCODE_SPACE, 1);
 675                                 set_amiga_key(KEYCODE_SPACE, 0);
 676                         }
 677                 }
 678         }
 679         button_a_last = button_a;
 680         button_b_last = button_b;
 681         button_x_last = button_x;
 682         button_y_last = button_y;
 683         button_menu_last = button_menu;
 684         button_left_trigger_last = button_left_trigger;
 685         button_right_trigger_last = button_right_trigger;
 686         button_left_thumb_last = button_left_thumb;
 687         button_right_thumb_last = button_right_thumb;
 688         stick_left_x_last = stick_left_x;
 689         stick_left_y_last = stick_left_y;
 690         stick_right_x_last = stick_right_x;
 691         stick_right_y_last = stick_right_y;
 692         thrust_last = thrust;
 693         joystick_set_x_last = joystick_set_x;
 694         joystick_set_y_last = joystick_set_y;
 695
 696         /* we must handle keyboard after toggeling keyboard_on,
 697          * so that keyboard_on will not change until keyboard is rendered */
 698         vr_key = 0;
 699         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 700 }
 701 #endif
 702
 703 static void skip_intro(void)
 704 {
 705         int event;
 706         double render_delay = 0.0;
 707         double cycle_count;
 708
 709         if (intro_skipped)
 710                 return;
 711
 712         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 713         do {
 714                 /* render, if not delayed */
 715                 if (render_delay <= 0.0) {
 716                         cycle_count = 0;
 717                         do {
 718                                 cycle_count += execute_cpu(0, &event);
 719                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 720                         render_delay += (double)cycle_count / CPU_SPEED;
 721                 }
 722                 /* VBL */
 723                 execute_cpu(3, NULL);
 724                 /* count down render delay */
 725                 if (render_delay) {
 726                         render_delay -= 1.0 / (double)IRQ_RATE;
 727                         if (render_delay < 0.0)
 728                                 render_delay = 0.0;
 729                 }
 730         } while (event != STOP_AT_CLEAR_SCREEN1);
 731
 732         intro_skipped = 1;
 733 }
 734
 735 static void special_event(int event)
 736 {
 737 #ifdef HAVE_OVR
 738         /* handle VR events */
 739         if (event == STOP_AT_PATCH_VR) {
 740                 mercenary_patch_vr();
 741                 return;
 742         }
 743 #endif
 744         /* handle events to improve rendering */
 745         if (render_improved)
 746                 render_capture_event(event);
 747 }
 748
 749 static void main_loop(void)
 750 {
 751         double frame_step, frame_time = 0.0, frame_render = 1;
 752         int had_first_irq = 0;
 753         static uint32_t current_time, last_time = 0, diff;
 754         int i, rc;
 755         int space, length;
 756         int cycle_count, event = STOP_AT_END;
 757         double render_delay = 0.0;
 758         uint32_t palette_address;
 759         uint16_t palette[16];
 760         int all_white = 0;
 761 #ifdef HAVE_OVR
 762         int eye;
 763         int vr = 1;
 764 #else
 765         int vr = 0;
 766 #endif
 767
 768         last_time = ticks_sdl();
 769
 770         /* render result on window */
 771         while (!quit) {
 772 #ifdef HAVE_OVR
 773                 /* quit by OVR server */
 774                 if (should_quit_ovr())
 775                         break;
 776                 /* get vr poses */
 777                 handle_vr_poses();
 778 #endif
 779                 /* if we are in interstellar fligt, we use 50 Hz */
 780                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 781                 /* else we use whatever frame rate the user wants */
 782                 if (render_capture_is_interstellar())
 783                         frame_step = vbl_duration * 50.0;
 784                 else if (!intro_skipped)
 785                         frame_step = vbl_duration * 10.0;
 786                 else
 787                         frame_step = vbl_duration * config_fps;
 788                 if (frame_step > 1.0)
 789                         frame_step = 1.0;
 790                 /* handle SDL events */
 791                 rc = event_sdl();
 792                 if (rc)
 793                         break;
 794
 795                 /* initialize rendering */
 796                 debug_opengl = config_debug_opengl;
 797                 benson_size = config_benson_size;
 798                 render_legacy = (!config_render) || debug_opengl;
 799                 render_improved = config_render || debug_opengl;
 800                 if (!render_improved) {
 801                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 802                         render_capture_reset();
 803                 }
 804                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 805                 /* amgia speed: don't render if we still delay */
 806                 /* non amiga speed: render if we need a new frame */
 807                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 808                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 809                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 810                 if (((frame_render && !config_amiga_speed)
 811                   || (config_amiga_speed && render_delay <= 0.0)
 812                   || event == STOP_AT_WAIT_INPUT)
 813                 && !(had_first_irq && help_view)) {
 814                         frame_render = 0;
 815                         /* start capturing for improved graphics */
 816                         if (render_improved)
 817                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_improve_stars_rotation, config_improve_fix_sky_rotation, config_improve_round_planets, config_debug_transparent);
 818
 819                         /* execute until the rendered image is ready (wait for VBL) */
 820                         cycle_count = 0;
 821                         do {
 822                                 cycle_count += execute_cpu(0, &event);
 823                                 /* handle special events */
 824                                 special_event(event);
 825                                 if (event == STOP_AT_CLEAR_SCREEN1)
 826                                         intro_skipped = 1;
 827                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 828                         /* stop capturing for improved graphics */
 829                         if (render_improved)
 830                                 render_capture_stop();
 831                         /* copy palette */
 832                         palette_address = mercenary_palette_view();
 833                         for (i = 0; i < 16; i++)
 834                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 835                         /* for amiga speed: set delay by the number of cycles */
 836                         if (config_amiga_speed)
 837                                 render_delay += (double)cycle_count / CPU_SPEED;
 838                         /* reset joystick after rendering */
 839                         reset_joystick();
 840                 }
 841
 842                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 843 #ifdef HAVE_OVR
 844                 begin_render_ovr();
 845
 846                 for (eye = 0; eye < 2; eye++) {
 847                         double camera_x, camera_y, camera_z;
 848                         /* begin of rendering eye, viewport and frustum is set here */
 849                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 850 #else
 851                 {
 852 #endif
 853                         /* clear screen */
 854                         opengl_clear(vr);
 855                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 856                         if (render_improved) {
 857 #ifndef HAVE_OVR
 858                                 /* viewport and frustum is set here */
 859                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 860 #endif
 861                                 /* render improved graphics, interpolate, if required,
 862                                  * if no item list is available, for legacy rendering
 863                                  */
 864                                 if (all_white)
 865                                         rc = render_all_white(vr);
 866                                 else
 867                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 868                                 if (rc)
 869                                         goto goto_legacy;
 870                                 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, vr);
 871                                 if (help_view)
 872                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 1.0, 1.0, 0.0, 0.0);
 873                                 if (osd_timer) {
 874                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, (vr) ? FOV_NOVAGEN : config_fov, config_monitor_distance, (vr) ? 1.0 : benson_size, 0.5, 0.04, 0.5, -0.95);
 875                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 876                                                 osd_timer = 0;
 877                                 }
 878 #ifndef HAVE_OVR
 879                                 /* draw border around legacy render area */
 880                                 if (border_timer) {
 881                                         opengl_render_color(1.0, 0.0, 0.0, 1.0);
 882                                         opengl_render_line(160, -68, 256, 160, 68, 256, 0.0);
 883                                         opengl_render_line(-160, -68, 256, -160, 68, 256, 0.0);
 884                                         opengl_render_line(-160, 68, 256, 160, 68, 256, 0.0);
 885                                         opengl_render_line(-160, -68, 256, 160, -68, 256, 0.0);
 886                                         if (border_timer - (int32_t)ticks_sdl() < 0)
 887                                                 border_timer = 0;
 888                                 }
 889 #endif
 890                         }
 891                         /* setup viewport for legacy image and render image, if enabled */
 892                         /* also render legacy, if render_improved failed due to not (yet) available items */
 893                         if (render_legacy) {
 894                                 goto_legacy:
 895                                 /* render game view without benson
 896                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 897                                  */
 898                                 if (had_first_irq)
 899                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 900 #ifndef HAVE_OVR
 901                                 /* viewport and frustum is set here */
 902                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 903 #endif
 904                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, FOV_NOVAGEN, config_monitor_distance, 1.0, 0);
 905                                 if (help_view)
 906                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 907                                 if (osd_timer) {
 908                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 909                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 910                                                 osd_timer = 0;
 911                                 }
 912                         }
 913 #ifdef HAVE_OVR
 914                         /* render keyboard */
 915                         if (keyboard_on)
 916                                 render_vr_keyboard(camera_x, camera_y);
 917
 918                         /* end of rendering eye */
 919                         end_render_ovr_eye(eye);
 920                 }
 921                 /* at this point we are ready with our image, so we display */
 922                 end_render_ovr();
 923                 render_mirror_ovr(window_width, window_height);
 924 #else
 925                 }
 926 #endif
 927                 swap_sdl();
 928
 929                 /* advance frame time, if we are not in help view  */
 930                 if (!(had_first_irq && help_view)) {
 931                         frame_time += frame_step;
 932                         if (frame_time >= 1.0) {
 933                                 frame_time -= 1.0;
 934                                 frame_render = 1;
 935                         }
 936                 }
 937
 938                 /* measure frame rate */
 939                 framerate_measure();
 940
 941                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 942                 /* only do this, if we are not in help view */
 943                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 944                 if (!(had_first_irq && help_view)) {
 945                         current_time = ticks_sdl();
 946                         diff = current_time - last_time;
 947                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 948                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 949                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 950                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 951                         }
 952                         while (diff > 1000 / IRQ_RATE) {
 953                                 /* trigger and execute IRQ 3 = VBL */
 954                                 execute_cpu(3, NULL);
 955                                 had_first_irq = 1;
 956                                 /* transfer benson without game view
 957                                  * because we only got benson refreshed during VBL IRQ
 958                                  */
 959                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 960                                 /* render sound to sound buffer
 961                                  * buffer pointer read and write is atomic, so no locking required!
 962                                  */
 963                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 964                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 965 #ifdef DEBUG_SOUND_BUFFERING
 966                                         fprintf(stderr, "sound buffer overflow\n");
 967 #endif
 968                                         length = space;
 969                                 } else
 970                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 971 #ifdef DEBUG_SOUND_BUFFERING
 972                                 printf("can write %d, write %d\n", space, length);
 973                                 static int cnt = 0;
 974                                 int s;
 975                                 for (s = 0; s < length; s++) {
 976                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 977                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 978                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 979                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 980                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 981                                          cnt++;
 982                                 }
 983 #else
 984                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 985 #endif
 986                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 987                                 diff -= 1000 / IRQ_RATE;
 988                                 last_time += 1000 / IRQ_RATE;
 989
 990                                 /* count down render delay */
 991                                 if (render_delay) {
 992                                         render_delay -= 1.0 / (double)IRQ_RATE;
 993                                         if (render_delay < 0.0)
 994                                                 render_delay = 0.0;
 995                                 }
 996                         }
 997                 }
 998         }
 999 }
1000
1001 static uint16_t io_read(uint32_t address)
1002 {
1003         uint16_t value = 0xffff;
1004
1005         /* joystick and fire button */
1006         if (address == 0xbfe000 || address == 0xdff00c)
1007                 value &= emulate_joystick_read(address);
1008         /* keyboard */
1009         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
1010                 value &= emulate_keyboard_read(address);
1011         /* diskette */
1012         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
1013                 value &= emulate_disk_read(address);
1014
1015         return value;
1016 }
1017
1018 static void io_write(uint32_t address, uint16_t value)
1019 {
1020         /* dmacon and sound registers */
1021         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
1022                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
1023         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
1024                 emulate_disk_write(address, value);
1025 }
1026
1027 /* two tracks with 0x1820 words of length */
1028 static uint8_t game_save[2][0x1820 << 1];
1029 static int last_track = 0;
1030
1031 /* game reads track with saved game */
1032 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1033 {
1034         if (length > sizeof(game_save[0])) {
1035                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
1036                 return;
1037         }
1038
1039         /* if even track is selected, load game */
1040         if (!(track & 1)) {
1041                 char filename[256];
1042                 int gamesave_num = (track - 2) >> 1;
1043
1044                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
1045
1046                 if (mission_disk == 0) {
1047                         int got;
1048                         FILE *fp;
1049
1050 #if defined(_WIN32)
1051                         filename[0] = '\0';
1052 #else
1053                         sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1054                         mkdir(filename, 0777);
1055 #endif
1056                         sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1057                         fp = fopen(filename, "r");
1058                         if (!fp) {
1059 fail:
1060                                 print_info("failed to load game from '%s'\n", filename);
1061                                 osd_info("load game", "FAILED!");
1062                                 goto copy;
1063                         }
1064                         got = fread(game_save, sizeof(game_save[0]), 2, fp);
1065                         fclose(fp);
1066                         if (got != 2)
1067                                 goto fail;
1068                         sprintf(filename, "#%d", gamesave_num);
1069                         osd_info("loaded game", filename);
1070                 } else {
1071                         const uint8_t *mission_data = get_mission_disk(mission_disk, gamesave_num);
1072                         sprintf(filename, "disk %d #%d", mission_disk, gamesave_num);
1073                         if (!mission_data) {
1074                                 print_info("failed to load mission %s\n", filename);
1075                                 osd_info("load mission", "FAILED!");
1076                                 goto copy;
1077                         }
1078                         memcpy(game_save, mission_data, 0x1820 << 2);
1079                         osd_info("loaded mission", filename);
1080                 }
1081         }
1082
1083 copy:
1084         /* copy track */
1085         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
1086 }
1087
1088 /* game writes track with saved game */
1089 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
1090 {
1091         /* cannot save on mission disk */
1092         if (mission_disk) {
1093                 osd_info("", "not applicable");
1094                 return;
1095         }
1096
1097         /* skip sync info that is provided by game and only relevant for a real disk track */
1098         data += 0x200;
1099         length -= 0x200;
1100
1101         if (length != sizeof(game_save[0])) {
1102                 print_error("saving game state failed, because length of data does not match, please fix!\n");
1103                 return;
1104         }
1105
1106         /* don't save if last track is the same, because disk is written on both sides with the same data */
1107         if (track == last_track) {
1108                 if (memcmp(memory + data, game_save[track & 1], length)) {
1109                         print_error("saving game data on other side of the disk is different, please fix!\n");
1110                 }
1111                 return;
1112         }
1113         last_track = track;
1114
1115         /* save game data */
1116         memcpy(game_save[track & 1], memory + data, length);
1117
1118         /* if done with saving */
1119         if ((track & 1)) {
1120                 char filename[256];
1121                 int gamesave_num = (track - 2) >> 1;
1122                 int wrote;
1123                 FILE *fp;
1124
1125 #if defined(_WIN32)
1126                 filename[0] = '\0';
1127 #else
1128                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1129                 mkdir(filename, 0777);
1130 #endif
1131                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1132                 fp = fopen(filename, "w");
1133                 if (!fp) {
1134 fail:
1135                         print_error("failed to save game to '%s'\n", filename);
1136                         osd_info("save game", "FAILED!");
1137                         return;
1138                 }
1139                 print_info("Game state saved to '%s'\n", filename);
1140                 sprintf(filename, "#%d", gamesave_num);
1141                 osd_info("saved game", filename);
1142                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1143                 fclose(fp);
1144                 if (wrote != 2)
1145                         goto fail;
1146         }
1147 }
1148
1149 static int shift = 0, ctrl = 0, alt = 0;
1150
1151 static void keyboard_sdl(int down, enum keycode keycode)
1152 {
1153         switch (keycode) {
1154         case KEYCODE_LCTRL:
1155         case KEYCODE_RCTRL:
1156                 ctrl = down;
1157                 break;
1158         default: break;
1159         }
1160
1161         if (ctrl && down) {
1162                 switch (keycode) {
1163                 case KEYCODE_h:
1164                         toggle_help();
1165                         break;
1166                 case KEYCODE_v:
1167                         config_video_filter ^= 1;
1168                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1169                         break;
1170                 case KEYCODE_a:
1171                         config_audio_filter ^= 1;
1172                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1173                         break;
1174                 case KEYCODE_s:
1175                         config_amiga_speed ^= 1;
1176                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1177                         break;
1178                 case KEYCODE_r:
1179                         config_render ^= 1;
1180                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1181                         break;
1182                 case KEYCODE_b:
1183                         if (!config_render && !config_debug_opengl) {
1184                                 osd_info("", "not applicable");
1185                                 break;
1186                         }
1187                         if (config_benson_size == 0.5) {
1188                                 config_benson_size = 1.0;
1189                                 config_fov = FOV_NOVAGEN;
1190                         } else {
1191                                 config_benson_size = 0.5;
1192                                 config_fov = FOV_JOLLY;
1193                         }
1194                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1195                         border_timer = ticks_sdl() + 1500;
1196                         break;
1197                 case KEYCODE_i:
1198                         if (!intro_skipped)
1199                                 skip_intro();
1200                         else
1201                                 osd_info("", "not applicable");
1202                         break;
1203                 case KEYCODE_1:
1204                         if (get_mission_disk(1, 1)) { /* just to check support */
1205                                 mission_disk = 1;
1206                                 osd_info("mission disk", "insert 1");
1207                         } else
1208                                 osd_info("", "not applicable");
1209                         break;
1210                 case KEYCODE_2:
1211                         if (get_mission_disk(2, 1)) { /* just to check support */
1212                                 mission_disk = 2;
1213                                 osd_info("mission disk", "insert 2");
1214                         } else
1215                                 osd_info("", "not applicable");
1216                         break;
1217                 case KEYCODE_0:
1218                         if (get_mission_disk(1, 1)) { /* just to check support */
1219                                 mission_disk = 0;
1220                                 osd_info("mission disk", "removed");
1221                         } else
1222                                 osd_info("", "not applicable");
1223                         break;
1224                 case KEYCODE_c:
1225                         if (config_ctrl_c)
1226                                 quit = 1;
1227                         break;
1228                 case KEYCODE_o:
1229 #ifdef HAVE_OVR
1230                         reset_observer_ovr();
1231                         osd_info("", "reset observer");
1232 #else
1233                         osd_info("", "not applicable");
1234 #endif
1235                         break;
1236                 case KEYCODE_KP_PLUS:
1237 #ifdef HAVE_OVR
1238                         osd_info("", "not applicable");
1239 #else
1240                         if (config_fov / 1.2 >= FOV_MIN)
1241                                 config_fov /= 1.2;
1242                         disp_fov:
1243                         {
1244                                 char text[16];
1245                                 if (config_fov < 63.5 || config_fov > 64.5)
1246                                         sprintf(text, "%.2f", config_fov);
1247                                 else
1248                                         sprintf(text, "%.2f (default)", config_fov);
1249                                 osd_info("FOV", text);
1250                                 border_timer = ticks_sdl() + 1500;
1251                         }
1252 #endif
1253                         break;
1254                 case KEYCODE_KP_MINUS:
1255 #ifdef HAVE_OVR
1256                         osd_info("", "not applicable");
1257 #else
1258                         if (config_fov * 1.2 <= FOV_MAX)
1259                                 config_fov *= 1.2;
1260                         goto disp_fov;
1261 #endif
1262                         break;
1263                 default: break;
1264                 }
1265                 /* do not pass keys to game while holding CTRL */
1266                 return;
1267         }
1268
1269         if (help_view == 1 && down) {
1270                 help_view = 2;
1271                 return;
1272         }
1273
1274         if (keycode == KEYCODE_PAUSE && down) {
1275                 toggle_help();
1276                 return;
1277         }
1278
1279         /* in help view we must not forward keypresses */
1280         if (help_view)
1281                 return;
1282
1283         switch (keycode) {
1284         case KEYCODE_LSHIFT:
1285                 set_amiga_key(keycode, down);
1286                 shift = down;
1287                 break;
1288         case KEYCODE_RSHIFT:
1289                 set_amiga_key(keycode, down);
1290                 shift = down;
1291                 break;
1292         case KEYCODE_LALT:
1293                 set_amiga_key(keycode, down);
1294                 alt = down;
1295                 break;
1296         case KEYCODE_RALT:
1297                 set_amiga_key(keycode, down);
1298                 alt = down;
1299                 break;
1300         case KEYCODE_LEFT:
1301                 if (shift && down) {
1302                         set_amiga_key(keycode, down);
1303                         set_joystick(-1, -1, -1, -1, -1);
1304                         break;
1305                 }
1306                 set_amiga_key(keycode, 0);
1307                 set_joystick(down, -1, -1, -1, -1);
1308                 break;
1309         case KEYCODE_RIGHT:
1310                 if (shift && down) {
1311                         set_amiga_key(keycode, down);
1312                         set_joystick(-1, -1, -1, -1, -1);
1313                         break;
1314                 }
1315                 set_amiga_key(keycode, 0);
1316                 set_joystick(-1, down, -1, -1, -1);
1317                 break;
1318         case KEYCODE_UP:
1319                 if (shift && down) {
1320                         set_amiga_key(keycode, down);
1321                         set_joystick(-1, -1, -1, -1, -1);
1322                         break;
1323                 }
1324                 set_amiga_key(keycode, 0);
1325                 if (!alt || down)
1326                         set_joystick(-1, -1, down, 0, -1);
1327                 break;
1328         case KEYCODE_DOWN:
1329                 if (shift && down) {
1330                         set_amiga_key(keycode, down);
1331                         set_joystick(-1, -1, -1, -1, -1);
1332                         break;
1333                 }
1334                 set_amiga_key(keycode, 0);
1335                 if (!alt || down)
1336                         set_joystick(-1, -1, 0, down, -1);
1337                 break;
1338         case KEYCODE_END:
1339                 set_joystick(-1, -1, -1, -1, down);
1340                 break;
1341         case KEYCODE_INSERT:
1342                 set_amiga_key(KEYCODE_HELP, down);
1343                 break;
1344         default:
1345                 /* reset vr thrust */
1346 #ifdef HAVE_OVR
1347                 thrust_last = 0;
1348 #endif
1349                 set_amiga_key(keycode, down);
1350         }
1351 }
1352
1353 static double joystick_last_x = 0, joystick_last_y = 0;
1354 static int joystick_last_fire = 0;
1355
1356 static void joystick_sdl(double x, double y, int fire)
1357 {
1358         int left = -1, right = -1, up = -1, down = -1;
1359
1360         if (x <= -0.5 && joystick_last_x > -0.5)
1361                 left = 1;
1362         if (x > -0.5 && joystick_last_x <= -0.5)
1363                 left = 0;
1364         if (x >= 0.5 && joystick_last_x < 0.5)
1365                 right = 1;
1366         if (x < 0.5 && joystick_last_x >= 0.5)
1367                 right = 0;
1368         if (y <= -0.5 && joystick_last_y > -0.5)
1369                 up = 1;
1370         if (y > -0.5 && joystick_last_y <= -0.5)
1371                 up = 0;
1372         if (y >= 0.5 && joystick_last_y < 0.5)
1373                 down = 1;
1374         if (y < 0.5 && joystick_last_y >= 0.5)
1375                 down = 0;
1376         set_joystick(left, right, up, down, fire);
1377         joystick_last_x = x;
1378         joystick_last_y = y;
1379         joystick_last_fire = fire;
1380 }
1381
1382 void audio_sdl(float *data, int length)
1383 {
1384         int fill, s;
1385
1386         /* read sound from sound buffer
1387          * buffer pointer read and write is atomic, so no locking required!
1388          */
1389         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1390         if (fill < length) {
1391 #ifdef DEBUG_SOUND_BUFFERING
1392                 fprintf(stderr, "sound buffer underrun\n");
1393 #endif
1394                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1395                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1396         }
1397         for (s = 0; s < length; s++) {
1398                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1399                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1400         }
1401 #ifdef DEBUG_SOUND_BUFFERING
1402         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1403 #endif
1404         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1405 }
1406
1407 /* used for geier counter */
1408 void sound_irq(void)
1409 {
1410         /* trigger and execute IRQ 4 = sound */
1411         execute_cpu(4, NULL);
1412 }
1413
1414 extern uint8_t mercenary_splash_palette[][3];
1415 extern char mercenary_splash_pixels[];
1416
1417 int main(int argc, char *argv[])
1418 {
1419         int rc;
1420         int sdl_sound_chunk;
1421
1422         home_dir = getenv("HOME");
1423         if (!home_dir)
1424                 home_dir = "";
1425
1426         rc = parse_args(argc, argv);
1427         if (rc)
1428                 return 0;
1429
1430         /* allocate image */
1431         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1432         if (!image) {
1433                 print_error("Failed to allocate image buffer\n");
1434                 goto done;
1435         }
1436
1437         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1438                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1439                 goto done;
1440         }
1441         if ((1000 % IRQ_RATE)) {
1442                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1443                 goto done;
1444         }
1445
1446         /* calculate SDL chunk size for audio
1447          * it must be a power of two, but not more than the chunk size for each IRQ!
1448          */
1449         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1450                 ;
1451         sdl_sound_chunk >>= 1;
1452 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1453
1454         /* allocate sound buffers */
1455         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1456         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1457         if (!sound_buffer) {
1458                 print_error("Failed to allocate image buffer\n");
1459                 goto done;
1460         }
1461
1462         /* allocate memory */
1463         memory = calloc(MEMORY_SIZE, 1);
1464         if (!memory) {
1465                 print_error("Failed to allocate cpu's memory\n");
1466                 goto done;
1467         }
1468         stop_event = calloc(MEMORY_SIZE, 1);
1469         if (!stop_event) {
1470                 print_error("Failed to allocate cpu's stop_event memory\n");
1471                 goto done;
1472         }
1473         chipreg = calloc(IOSIZE, 1);
1474         if (!chipreg) {
1475                 print_error("Failed to allocate chip register\n");
1476                 goto done;
1477         }
1478
1479         /* init cpu code */
1480         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1481
1482         /* init disk emulation */
1483         disk_init(disk_read, disk_write);
1484
1485         /* load binary */
1486         mercenary_load();
1487
1488         /* patch some stuff */
1489         mercenary_patch();
1490
1491         /* init SDL and OpenGL */
1492 #ifdef HAVE_OVR
1493         int vbl_sync = 0;
1494         int vr = 1;
1495         int multisampling = 0;
1496         window_width = SCREEN_WIDTH;
1497         window_height = SCREEN_HEIGHT;
1498 #else
1499         int vbl_sync = 1;
1500         int vr = 0;
1501         int multisampling = config_multisampling;
1502         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1503         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1504 #endif
1505         rc = init_sdl(mercenary_name, window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, config_joystick, config_joystick_x, config_joystick_y, config_joystick_fire, joystick_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1506         if (rc < 0)
1507                 goto done;
1508 #ifdef HAVE_OVR
1509         rc = init_ovr(config_multisampling);
1510         if (rc < 0)
1511                 goto done;
1512         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1513         if (rc < 0)
1514                 goto done;
1515 #endif
1516         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1517         if (rc < 0)
1518                 goto done;
1519
1520         /* init osd */
1521         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1522         if (rc < 0)
1523                 goto done;
1524         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1525         if (rc < 0)
1526                 goto done;
1527         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, 0x00);
1528         if (!help_osd[0])
1529                 goto done;
1530         text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
1531         help_views++;
1532         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1533         if (!help_osd[1])
1534                 goto done;
1535         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);
1536         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1537                 "Emulation:\n"
1538                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1539                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1540                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1541                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1542                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1543                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1544                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1545                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1546                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1547                 "        Press `CTRL' + `1' or `2' to insert or `0' to remove mission disk.\n"
1548 #ifdef HAVE_OVR
1549                 "        Press `CTRL' + `O' to reset observer position.\n"
1550 #endif
1551                 "\n"
1552                 "Answer to a Question:\n"
1553                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1554                 "\n"
1555                 "Walking / Driving / Flying:\n"
1556                 "        Use cursor keys as joystick, to move player / craft.\n"
1557                 "        Press `R' for running, 'W' for walking speed.\n"
1558                 "        Press `B' to board, `L' to leave.\n"
1559                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1560                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1561                 "        Press `SPACE' to stop craft.\n"
1562                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1563                 "        Press `T' for turbo on certain craft.\n"
1564                 "        Press `END' as joystick's fire button.\n"
1565                 "\n"
1566                 "Elevator:\n"
1567                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1568                 "\n"
1569                 "Inside a transporter:\n"
1570                 "        Press `1'...`0' to select destination.\n"
1571                 "\n"
1572                 "Items:\n"
1573                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1574                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1575                 "        Press `NUMPAD Enter' to select certain items.\n"
1576                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1577                 "        Press `NUMPAD *' to read entry\n"
1578                 "Saving / Loading / Pause:\n"
1579                 "        Press `INSERT' to loading and saving options.\n"
1580                 "        Press `ENTER' to pause game, other key to continue.\n"
1581                 ,HELP_ALPHA, 1, 2, 5, 0);
1582                 help_views++;
1583 #ifdef HAVE_OVR
1584         help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1585         if (!help_osd[2])
1586                 goto done;
1587         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1588         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1589                 "Emulation using Controller:\n"
1590                 "        Press `A' or 'X' button to toggle this help screen on or off.\n"
1591                 "        Press 'B' or 'Y' button to reset observer position. (importaint!)\n"
1592                 "        To have a virtual keyboard, point right hand below control pannel.\n"
1593                 "        Point to a key on keyboard. The key will highlight.\n"
1594                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1595                 "\n"
1596                 "Walking / Driving / Flying using Controller:\n"
1597                 "        Use thumb stick on right controller, to move player / craft.\n"
1598                 "        Move thumb stick forth and back to walk, left and right to rotate.\n"
1599                 "        Pull `Trigger' on right controller to change orientation.\n"
1600                 "        Press `X' button to board, `Y' button to leave.\n"
1601                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1602                 "        Pull `Trigger' on left controller stop craft.\n"
1603                 "        Press thumb stick on left controller for escape sequence and stop it.\n"
1604                 "        Pull `Trigger' on right controller to fire.\n"
1605                 "\n"
1606                 "For all other game function, use the virtual or real keyboard!\n"
1607                 ,HELP_ALPHA, 1, 2, 5, 0);
1608                 help_views++;
1609 #endif
1610         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1611         if (!info_osd)
1612                 goto done;
1613
1614         /* init audio */
1615         sound_init(SOUND_SAMPLERATE, sound_irq);
1616
1617         /* start cpu */
1618         reset_cpu();
1619
1620         if (config_skip_intro)
1621                 skip_intro();
1622
1623         /* run game */
1624         main_loop();
1625
1626 done:
1627         exit_opengl();
1628 #ifdef HAVE_OVR
1629         exit_ovr();
1630 #endif
1631         exit_sdl();
1632
1633         if (chipreg)
1634                 free(chipreg);
1635         if (stop_event)
1636                 free(stop_event);
1637         if (memory)
1638                 free(memory);
1639         if (sound_buffer)
1640                 free(sound_buffer);
1641         if (image)
1642                 free(image);
1643         while (help_views) {
1644                 help_views--;
1645                 if (help_osd[help_views])
1646                         free(help_osd[help_views]);
1647         }
1648         if (info_osd)
1649                 free(info_osd);
1650
1651         return 0;
1652 }
1653