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