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