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