src/mercenary/main.c

   1 /* main routine
   2  *
   3  * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
   4  * All Rights Reserved
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <math.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include "../../include/keycodes.h"
  28 #include "../libsdl/sdl.h"
  29 #ifdef HAVE_OVR
  30 #include "../libovr/ovr.h"
  31 #include "../libovr/keyboard.h"
  32 #endif
  33 #include "../libsdl/opengl.h"
  34 #include "../libsdl/print.h"
  35 #include "../libcpu/m68k.h"
  36 #include "../libcpu/execute.h"
  37 #include "../libframerate/framerate.h"
  38 #include "../libvideo/video.h"
  39 #include "../libsound/sound.h"
  40 #include "../libjoystick/joystick.h"
  41 #include "../libkeyboard/keyboard.h"
  42 #include "../libdisk/disk.h"
  43 #include "../libtext/text.h"
  44 #include "mercenary.h"
  45 #include "render.h"
  46
  47 #define FOV_MIN         10.0
  48 #define FOV_NOVAGEN     64.0
  49 #define FOV_JOLLY       80.0
  50 #define FOV_MAX         170.0
  51
  52 #define STICK_WALK_THRESHOLD 0.3 /* move the stick until the player moves */
  53 #define STICK_ROTATE_THRESHOLD 0.3 /* move the stick until the player rotates */
  54 #define STICK_THRUST_THRESHOLD 0.1 /* 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 = 16.0;
  59 #if !defined(_WIN32)
  60 static const char *config_gamesave_dir = ".mercenary";
  61 #endif
  62 static int config_video_filter = 1;
  63 static int config_audio_filter = 1;
  64 static int config_render = 1; /* opengl render */
  65 static int config_skip_intro = 0;
  66 static int config_multisampling = 8;
  67 #ifdef HAVE_OVR
  68 static double config_benson_size = 0.5;
  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 = 31.5; /* inch */
  75 #ifdef HAVE_OVR
  76 static double config_keyboard_distance = 28.5; /* inch */
  77 static double config_keyboard_height = 4.0; /* 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[2] = { NULL, NULL };
 112 static uint8_t *info_osd = NULL;
 113 static int help_view = 1;
 114 static int help_views = 1;
 115 static int32_t osd_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
 143 static const char *home_dir;
 144
 145 static int quit = 0;
 146
 147 int parse_args(int argc, char *argv[])
 148 {
 149         int i = 1;
 150
 151         while (argc > i) {
 152                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 153                         /*          |                                                                             | */
 154                         print_info("Usage: %s\n", argv[0]);
 155                         print_info(" -s --render-speed original | fast\n");
 156                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 157                         print_info("    --fps <fps>\n");
 158                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 159                         print_info(" -v --video-filter on | off\n");
 160                         print_info("        Set video filter.\n");
 161                         print_info(" -a --audio-filter on | off\n");
 162                         print_info("        Set audio filter.\n");
 163                         print_info(" -r --render original | opengl\n");
 164                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 165                         print_info(" -b --benson normal | half\n");
 166                         print_info("        Size of 'Benson' (control panel).\n");
 167                         print_info(" -m --multisampling <samples>\n");
 168                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 169                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 170                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 171                         print_info(" -i --skip-intro\n");
 172                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 173                         print_info("Improvement options:\n");
 174                         print_info("    --extend-roads 1 | 0\n");
 175                         print_info("        Roads in the distance end in a single point. This was ok for low\n");
 176                         print_info("        resolution, but for OpenGL we want equal width all the way.\n");
 177                         print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
 178                         print_info("    --smooth-planets 1 | 0\n");
 179                         print_info("        Planet's rotation uses integer value, so they judder in the original\n");
 180                         print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
 181                         print_info("    --stars-rotation 1 | 0\n");
 182                         print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
 183                         print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
 184                         print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
 185                         print_info("    --fix-sky-rotation 1 | 0\n");
 186                         print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
 187                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 188                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 189                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
 190                         print_info("    --round-planets 1 | 0\n");
 191                         print_info("        The original game renders planets and explosion debris horizontally\n");
 192                         print_info("        stretched. This compensates the vertical stretch of NTSC vs PAL video.\n");
 193                         print_info("        The original (stretched) sphere makes the game authentic.\n");
 194                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_round_planets);
 195                         print_info("Debug options:\n");
 196                         print_info(" -o --debug-opengl\n");
 197                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 198                         print_info("    --debug-transparent\n");
 199                         print_info("        Draw all things half transparent.\n");
 200                         print_info("    --ctrl-c\n");
 201                         print_info("        Use CTRL+C to exit game (used for development)\n");
 202                         return -1;
 203                 } else
 204                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 205                         i++;
 206                         if (argc == i) {
 207 missing_parameter:
 208                                 print_info("Missing parameter, use '--help'!\n");
 209                                 return -1;
 210                         }
 211                         if (!strcmp(argv[i], "original"))
 212                                 config_amiga_speed = 1;
 213                         else
 214                         if (!strcmp(argv[i], "fast"))
 215                                 config_amiga_speed = 0;
 216                         else {
 217 illegal_parameter:
 218                                 print_info("Illegal parameter, use '--help'!\n");
 219                                 return -1;
 220                         }
 221                 } else
 222                 if (!strcmp(argv[i], "--fps")) {
 223                         i++;
 224                         if (argc == i)
 225                                 goto missing_parameter;
 226                         config_fps = atof(argv[i]);
 227                         if (config_fov <= 0.0)
 228                                 goto illegal_parameter;
 229                 } else
 230                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         if (!strcmp(argv[i], "on"))
 235                                 config_video_filter = 1;
 236                         else
 237                         if (!strcmp(argv[i], "off"))
 238                                 config_video_filter = 0;
 239                         else
 240                                 goto illegal_parameter;
 241                 } else
 242                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 243                         i++;
 244                         if (argc == i)
 245                                 goto missing_parameter;
 246                         if (!strcmp(argv[i], "on"))
 247                                 config_audio_filter = 1;
 248                         else
 249                         if (!strcmp(argv[i], "off"))
 250                                 config_audio_filter = 0;
 251                         else
 252                                 goto illegal_parameter;
 253                 } else
 254                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 255                         i++;
 256                         if (argc == i)
 257                                 goto missing_parameter;
 258                         if (!strcmp(argv[i], "original"))
 259                                 config_render = 0;
 260                         else
 261                         if (!strcmp(argv[i], "opengl"))
 262                                 config_render = 1;
 263                         else
 264                                 goto illegal_parameter;
 265                 } else
 266                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 267                         i++;
 268                         if (argc == i)
 269                                 goto missing_parameter;
 270                         if (!strcmp(argv[i], "normal"))
 271                                 config_benson_size = 1.0;
 272                         else
 273                         if (!strcmp(argv[i], "half")) {
 274                                 config_benson_size = 0.5;
 275                                 if (config_fov == FOV_NOVAGEN)
 276                                         config_fov = FOV_JOLLY;
 277                         } else
 278                                 goto illegal_parameter;
 279                 } else
 280                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 281                         i++;
 282                         if (argc == i)
 283                                 goto missing_parameter;
 284                         config_multisampling = atoi(argv[i]);
 285                 } else
 286                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 287                         i++;
 288                         if (argc == i)
 289                                 goto missing_parameter;
 290                         config_fov = atof(argv[i]);
 291                         if (config_fov < 1.0 || config_fov > 179.0)
 292                                 goto illegal_parameter;
 293                 } else
 294                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 295                         config_skip_intro = 1;
 296                 } else
 297                 if (!strcmp(argv[i], "--extend-roads")) {
 298                         i++;
 299                         if (argc == i)
 300                                 goto missing_parameter;
 301                         config_improve_extend_roads = atoi(argv[i]);
 302                 } else
 303                 if (!strcmp(argv[i], "--smooth-planets")) {
 304                         i++;
 305                         if (argc == i)
 306                                 goto missing_parameter;
 307                         config_improve_smooth_planets = atoi(argv[i]);
 308                 } else
 309                 if (!strcmp(argv[i], "--stars-rotation")) {
 310                         i++;
 311                         if (argc == i)
 312                                 goto missing_parameter;
 313                         config_improve_stars_rotation = atoi(argv[i]);
 314                 } else
 315                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 316                         i++;
 317                         if (argc == i)
 318                                 goto missing_parameter;
 319                         config_improve_fix_sky_rotation = atoi(argv[i]);
 320                 } else
 321                 if (!strcmp(argv[i], "--round-planets")) {
 322                         i++;
 323                         if (argc == i)
 324                                 goto missing_parameter;
 325                         config_improve_round_planets = atoi(argv[i]);
 326                 } else
 327                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 328                         config_debug_opengl = 1;
 329                 } else
 330                 if (!strcmp(argv[i], "--debug-transparent")) {
 331                         config_debug_transparent = 1;
 332                 } else
 333                 if (!strcmp(argv[i], "--ctrl-c")) {
 334                         config_ctrl_c = 1;
 335                 } else {
 336                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 337                         return -1;
 338                 }
 339                 i++;
 340         }
 341
 342         return 0;
 343 }
 344
 345 static void osd_info(const char *param, const char *value)
 346 {
 347         char line[41] = "                                        ";
 348
 349         if (param[0]) {
 350                 strncpy(line + 21 - strlen(param), param, strlen(param));
 351                 line[22] = ':';
 352         }
 353         if (strlen(value) > 15) {
 354                 print_error("string too long\n");
 355                 return;
 356         }
 357         strncpy(line + 25, value, strlen(value));
 358         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 359         osd_timer = ticks_sdl() + 2500;
 360 }
 361
 362 static void resize_window(int width, int height)
 363 {
 364         window_width = width;
 365         window_height = height;
 366 }
 367
 368 #ifdef HAVE_OVR
 369 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;
 370 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;
 371 static int thrust_last = 0;
 372 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 373 static int keyboard_on = 0;
 374 static enum keycode vr_key_pressed = 0, vr_key = 0;
 375
 376 static void handle_vr_poses(void)
 377 {
 378         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;
 379         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 380         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 381         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 382         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 383         int thrust = 0;
 384         int joystick_set_x = 0, joystick_set_y = 0;
 385         static uint32_t current_time, last_time = 0, diff;
 386         static double increment, inc_count = 0.0;
 387
 388         /* handle input */
 389         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);
 390         if (button_menu && !button_menu_last) {
 391                 /* menu toggle */
 392                 if (help_view == help_views)
 393                         help_view = 0;
 394                 else
 395                         help_view++;
 396         }
 397         if (button_left_trigger && button_right_trigger) {
 398                 /* reset observer */
 399                 reset_observer_ovr();
 400                 osd_info("", "reset observer");
 401         }
 402         if (!help_view) {
 403                 if (button_a && !button_a_last) {
 404                         /* keyboard A toggle */
 405                         if (keyboard_on == 1)
 406                                 keyboard_on = 0;
 407                         else
 408                                 keyboard_on = 1;
 409                 }
 410                 if (button_b && !button_b_last) {
 411                         /* keyboard B toggle */
 412                         if (keyboard_on == 2)
 413                                 keyboard_on = 0;
 414                         else
 415                                 keyboard_on = 2;
 416                 }
 417                 if (button_x && !button_x_last) {
 418                         /* 'board' pressed */
 419                         set_amiga_key(KEYCODE_b, 1);
 420                         set_amiga_key(KEYCODE_b, 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_thumb && !button_right_thumb_last) {
 428                         /* 'change orientation' pressed */
 429                         double roll, pitch, yaw;
 430                         mercenary_get_orientation(&roll, &pitch, &yaw);
 431                         mercenary_set_orientation(yaw + hand_right_yaw);
 432                 }
 433                 if (button_right_trigger && !button_right_trigger_last) {
 434                         /* trigger pressed */
 435                         if (!keyboard_on) {
 436                                 set_joystick(-1, -1, -1, -1, 1);
 437                         } else if (vr_key) {
 438                                 vr_key_pressed = vr_key;
 439                                 set_amiga_key(vr_key_pressed, 1);
 440                         }
 441                 }
 442                 if (!button_right_trigger && button_right_trigger_last) {
 443                         /* trigger released */
 444                         set_joystick(-1, -1, -1, -1, 0);
 445                         if (vr_key_pressed) {
 446                                 set_amiga_key(vr_key_pressed, 0);
 447                                 vr_key_pressed = 0;
 448                         }
 449                 }
 450                 /* joystick */
 451                 /* reset moving state, so the game is not influenced before we want to */
 452                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 453                 joystick_set_x = 0;
 454                 joystick_set_y = 0;
 455                 if (!mercenary_get_info_walking()) {
 456                         /* turn right and left when not walking */
 457                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 458                                 set_joystick(0, 1, -1, -1, -1);
 459                                 joystick_set_x = 1;
 460                         } else
 461                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 462                                 set_joystick(1, 0, -1, -1, -1);
 463                                 joystick_set_x = 1;
 464                         }
 465                         /* pitch craft */
 466                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 467                                 set_joystick(-1, -1, 1, 0, -1);
 468                                 joystick_set_y = 1;
 469                         } else
 470                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 471                                 set_joystick(-1, -1, 0, 1, -1);
 472                                 joystick_set_y = 1;
 473                         }
 474                         if (joystick_set_x || joystick_set_y) {
 475                                 mercenary_vr_move(0, NULL, NULL,
 476                                         256,
 477                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 478                         }
 479                 } else {
 480                         double roll, pitch, yaw;
 481                         double dist, dir, east, north;
 482                         int32_t move_east[4], move_north[4];
 483
 484                         /* check if we push the stick */
 485                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 486                         if (dist > STICK_WALK_THRESHOLD) {
 487                                 /* get stick amplitude (dist) and direction (dir) */
 488                                 if (dist > 1.0)
 489                                         dist = 1.0;
 490                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 491                                 dir = atan2(stick_right_x, stick_right_y);
 492                                 /* use hand direction to get actual stick direction */
 493                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 494                                 if (dir < -M_PI)
 495                                         dir += M_PI * 2.0;
 496                                 if (dir > M_PI)
 497                                         dir -= M_PI * 2.0;
 498                                 /* flip directin, if we walk backwards */
 499                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 500                                         /* go backwards */
 501                                         set_joystick(-1, -1, 0, 1, -1);
 502                                         joystick_set_y = 1;
 503                                 } else {
 504                                         /* go forward */
 505                                         set_joystick(-1, -1, 1, 0, -1);
 506                                         joystick_set_y = 1;
 507                                 }
 508                                 joystick_set_y = 1;
 509                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 510                                 east = sin(yaw - dir + M_PI) * dist;
 511                                 north = -cos(yaw - dir + M_PI) * dist;
 512                                 /* calculatate the integer positions of 4 steps */
 513                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 514                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 515                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 516                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 517                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 518                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 519                                 move_east[3] = (int32_t)(east + 0.5);
 520                                 move_north[3] = (int32_t)(north + 0.5);
 521                                 /* calculate the delta between each of the 4 step */
 522                                 move_east[3] -= move_east[2];
 523                                 move_north[3] -= move_north[2];
 524                                 move_east[2] -= move_east[1];
 525                                 move_north[2] -= move_north[1];
 526                                 move_east[1] -= move_east[0];
 527                                 move_north[1] -= move_north[0];
 528                                 /* the game takes 4 steps to move the player */
 529                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 530                         }
 531                 }
 532                 if (joystick_set_x_last && !joystick_set_x)
 533                         set_joystick(0, 0, -1, -1, -1);
 534                 if (joystick_set_y_last && !joystick_set_y)
 535                         set_joystick(-1, -1, 0, 0, -1);
 536                 /* thrust */
 537                 thrust = thrust_last;
 538                 /* button to toggle between stop and escape */
 539                 if (button_left_thumb && !button_left_thumb_last) {
 540                         /* 'escape' pressed */
 541                         if (thrust_last == 0)
 542                                 thrust = -99;
 543                         else
 544                                 thrust = 0;
 545                 }
 546                 /* get stick to increment or decrement thrust */
 547                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 548                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 549                 else
 550                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 551                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 552                 else
 553                         increment = 0;
 554                 current_time = ticks_sdl();
 555                 if (increment) {
 556                         diff = current_time - last_time;
 557                         inc_count += increment * diff;
 558                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 559                                 thrust++;
 560                                 inc_count = 0.0;
 561                         }
 562                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 563                                 thrust--;
 564                                 inc_count = 0.0;
 565                         }
 566                 } else {
 567                         inc_count = 0;
 568                 }
 569                 last_time = current_time;
 570                 /* send thrust change as keycodes */
 571                 if (thrust_last != thrust) {
 572                         if (thrust >= 10) {
 573                                 set_amiga_key(KEYCODE_0, 1);
 574                                 set_amiga_key(KEYCODE_0, 0);
 575                         } else
 576                         if (thrust <= -10 && thrust > -99) {
 577                                 set_amiga_key(KEYCODE_F10, 1);
 578                                 set_amiga_key(KEYCODE_F10, 0);
 579                         } else
 580                         if (thrust <= -99) {
 581                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 582                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 583                         } else
 584                         if (thrust > 0) {
 585                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 586                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 587                         } else
 588                         if (thrust < 0) {
 589                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 590                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 591                         } else {
 592                                 set_amiga_key(KEYCODE_SPACE, 1);
 593                                 set_amiga_key(KEYCODE_SPACE, 0);
 594                         }
 595                 }
 596         }
 597         button_a_last = button_a;
 598         button_b_last = button_b;
 599         button_x_last = button_x;
 600         button_y_last = button_y;
 601         button_menu_last = button_menu;
 602         button_left_trigger_last = button_left_trigger;
 603         button_right_trigger_last = button_right_trigger;
 604         button_left_thumb_last = button_left_thumb;
 605         button_right_thumb_last = button_right_thumb;
 606         stick_left_x_last = stick_left_x;
 607         stick_left_y_last = stick_left_y;
 608         stick_right_x_last = stick_right_x;
 609         stick_right_y_last = stick_right_y;
 610         thrust_last = thrust;
 611         joystick_set_x_last = joystick_set_x;
 612         joystick_set_y_last = joystick_set_y;
 613
 614         /* we must handle keyboard after toggeling keyboard_on,
 615          * so that keyboard_on will not change until keyboard is rendered */
 616         vr_key = 0;
 617         if (keyboard_on)
 618                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 619 }
 620 #endif
 621
 622 static void skip_intro(void)
 623 {
 624         int event;
 625         double render_delay = 0.0;
 626         double cycle_count;
 627
 628         if (intro_skipped)
 629                 return;
 630
 631         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 632         do {
 633                 /* render, if not delayed */
 634                 if (render_delay <= 0.0) {
 635                         cycle_count = 0;
 636                         do {
 637                                 cycle_count += execute_cpu(0, &event);
 638                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 639                         render_delay += (double)cycle_count / CPU_SPEED;
 640                 }
 641                 /* VBL */
 642                 execute_cpu(3, NULL);
 643                 /* count down render delay */
 644                 if (render_delay) {
 645                         render_delay -= 1.0 / (double)IRQ_RATE;
 646                         if (render_delay < 0.0)
 647                                 render_delay = 0.0;
 648                 }
 649         } while (event != STOP_AT_CLEAR_SCREEN1);
 650
 651         intro_skipped = 1;
 652 }
 653
 654 static void special_event(int event)
 655 {
 656 #ifdef HAVE_OVR
 657         /* handle VR events */
 658         if (event == STOP_AT_PATCH_VR) {
 659                 mercenary_patch_vr();
 660                 return;
 661         }
 662 #endif
 663         /* handle events to improve rendering */
 664         if (render_improved)
 665                 render_capture_event(event);
 666 }
 667
 668 static void main_loop(void)
 669 {
 670         double frame_step, frame_time = 0.0, frame_render = 1;
 671         int had_first_irq = 0;
 672         static uint32_t current_time, last_time = 0, diff;
 673         int i, rc;
 674         int space, length;
 675         int cycle_count, event = STOP_AT_END;
 676         double render_delay = 0.0;
 677         uint32_t palette_address;
 678         uint16_t palette[16];
 679         int all_white = 0;
 680 #ifdef HAVE_OVR
 681         int eye;
 682         int vr = 1;
 683 #else
 684         int vr = 0;
 685 #endif
 686
 687         last_time = ticks_sdl();
 688
 689         /* render result on window */
 690         while (!quit) {
 691 #ifdef HAVE_OVR
 692                 /* get vr poses */
 693                 handle_vr_poses();
 694 #endif
 695                 /* if we are in interstellar fligt, we use 50 Hz */
 696                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 697                 /* else we use whatever frame rate the user wants */
 698                 if (render_capture_is_interstellar())
 699                         frame_step = vbl_duration * 50.0;
 700                 else if (!intro_skipped)
 701                         frame_step = vbl_duration * 10.0;
 702                 else
 703                         frame_step = vbl_duration * config_fps;
 704                 if (frame_step > 1.0)
 705                         frame_step = 1.0;
 706                 /* handle SDL events */
 707                 rc = event_sdl();
 708                 if (rc)
 709                         break;
 710
 711                 /* initialize rendering */
 712                 debug_opengl = config_debug_opengl;
 713                 benson_size = config_benson_size;
 714                 render_legacy = (!config_render) || debug_opengl;
 715                 render_improved = config_render || debug_opengl;
 716                 if (!render_improved) {
 717                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 718                         render_capture_reset();
 719                 }
 720                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 721                 /* amgia speed: don't render if we still delay */
 722                 /* non amiga speed: render if we need a new frame */
 723                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 724                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 725                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 726                 if (((frame_render && !config_amiga_speed)
 727                   || (config_amiga_speed && render_delay <= 0.0)
 728                   || event == STOP_AT_WAIT_INPUT)
 729                 && !(had_first_irq && help_view)) {
 730                         frame_render = 0;
 731                         /* start capturing for improved graphics */
 732                         if (render_improved)
 733                                 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);
 734
 735                         /* execute until the rendered image is ready (wait for VBL) */
 736                         cycle_count = 0;
 737                         do {
 738                                 cycle_count += execute_cpu(0, &event);
 739                                 /* handle special events */
 740                                 special_event(event);
 741                                 if (event == STOP_AT_CLEAR_SCREEN1)
 742                                         intro_skipped = 1;
 743                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 744                         /* stop capturing for improved graphics */
 745                         if (render_improved)
 746                                 render_capture_stop();
 747                         /* copy palette */
 748                         palette_address = mercenary_palette_view();
 749                         for (i = 0; i < 16; i++)
 750                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 751                         /* for amiga speed: set delay by the number of cycles */
 752                         if (config_amiga_speed)
 753                                 render_delay += (double)cycle_count / CPU_SPEED;
 754                 }
 755
 756                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 757 #ifdef HAVE_OVR
 758                 begin_render_ovr();
 759
 760                 for (eye = 0; eye < 2; eye++) {
 761                         double camera_x, camera_y, camera_z;
 762                         /* begin of rendering eye, viewport and frustum is set here */
 763                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 764 #else
 765                 {
 766 #endif
 767                         /* clear screen */
 768                         opengl_clear(vr);
 769                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 770                         if (render_improved) {
 771 #ifndef HAVE_OVR
 772                                 /* viewport and frustum is set here */
 773                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 774 #endif
 775                                 /* render improved graphics, interpolate, if required,
 776                                  * if no item list is available, for legacy rendering
 777                                  */
 778                                 if (all_white)
 779                                         rc = render_all_white(vr);
 780                                 else
 781                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 782                                 if (rc)
 783                                         goto goto_legacy;
 784                                 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);
 785                                 if (help_view)
 786                                         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);
 787                                 if (osd_timer) {
 788                                         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);
 789                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 790                                                 osd_timer = 0;
 791                                 }
 792                         }
 793                         /* setup viewport for legacy image and render image, if enabled */
 794                         /* also render legacy, if render_improved failed due to not (yet) available items */
 795                         if (render_legacy) {
 796                                 goto_legacy:
 797                                 /* render game view without benson
 798                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 799                                  */
 800                                 if (had_first_irq)
 801                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 802 #ifndef HAVE_OVR
 803                                 /* viewport and frustum is set here */
 804                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 805 #endif
 806                                 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);
 807                                 if (help_view)
 808                                         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);
 809                                 if (osd_timer) {
 810                                         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);
 811                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 812                                                 osd_timer = 0;
 813                                 }
 814                         }
 815 #ifdef HAVE_OVR
 816                         /* render keyboard */
 817                         if (keyboard_on)
 818                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 819
 820                         /* end of rendering eye */
 821                         end_render_ovr_eye(eye);
 822                 }
 823                 /* at this point we are ready with our image, so we display */
 824                 end_render_ovr();
 825                 render_mirror_ovr(window_width, window_height);
 826 #else
 827                 }
 828 #endif
 829                 swap_sdl();
 830
 831                 /* advance frame time, if we are not in help view  */
 832                 if (!(had_first_irq && help_view)) {
 833                         frame_time += frame_step;
 834                         if (frame_time >= 1.0) {
 835                                 frame_time -= 1.0;
 836                                 frame_render = 1;
 837                         }
 838                 }
 839
 840                 /* measure frame rate */
 841                 framerate_measure();
 842
 843                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 844                 /* only do this, if we are not in help view */
 845                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 846                 if (!(had_first_irq && help_view)) {
 847                         current_time = ticks_sdl();
 848                         diff = current_time - last_time;
 849                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 850                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 851                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 852                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 853                         }
 854                         while (diff > 1000 / IRQ_RATE) {
 855                                 /* trigger and execute IRQ 3 = VBL */
 856                                 execute_cpu(3, NULL);
 857                                 had_first_irq = 1;
 858                                 /* transfer benson without game view
 859                                  * because we only got benson refreshed during VBL IRQ
 860                                  */
 861                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 862                                 /* render sound to sound buffer
 863                                  * buffer pointer read and write is atomic, so no locking required!
 864                                  */
 865                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 866                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 867 #ifdef DEBUG_SOUND_BUFFERING
 868                                         fprintf(stderr, "sound buffer overflow\n");
 869 #endif
 870                                         length = space;
 871                                 } else
 872                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 873 #ifdef DEBUG_SOUND_BUFFERING
 874                                 printf("can write %d, write %d\n", space, length);
 875                                 static int cnt = 0;
 876                                 int s;
 877                                 for (s = 0; s < length; s++) {
 878                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 879                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 880                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 881                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 882                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 883                                          cnt++;
 884                                 }
 885 #else
 886                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 887 #endif
 888                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 889                                 diff -= 1000 / IRQ_RATE;
 890                                 last_time += 1000 / IRQ_RATE;
 891
 892                                 /* count down render delay */
 893                                 if (render_delay) {
 894                                         render_delay -= 1.0 / (double)IRQ_RATE;
 895                                         if (render_delay < 0.0)
 896                                                 render_delay = 0.0;
 897                                 }
 898                         }
 899                 }
 900         }
 901 }
 902
 903 static uint16_t io_read(uint32_t address)
 904 {
 905         uint16_t value = 0xffff;
 906
 907         /* joystick and fire button */
 908         if (address == 0xbfe000 || address == 0xdff00c)
 909                 value &= emulate_joystick_read(address);
 910         /* keyboard */
 911         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 912                 value &= emulate_keyboard_read(address);
 913         /* diskette */
 914         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 915                 value &= emulate_disk_read(address);
 916
 917         return value;
 918 }
 919
 920 static void io_write(uint32_t address, uint16_t value)
 921 {
 922         /* dmacon and sound registers */
 923         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 924                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 925         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 926                 emulate_disk_write(address, value);
 927 }
 928
 929 /* two tracks with 0x1820 words of length */
 930 static uint8_t game_save[2][0x1820 << 1];
 931 static int last_track = 0;
 932
 933 /* game reads track with saved game */
 934 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 935 {
 936         if (length > sizeof(game_save[0])) {
 937                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 938                 return;
 939         }
 940
 941         /* if even track is selected, load game */
 942         if (!(track & 1)) {
 943                 char filename[256];
 944                 int gamesave_num = (track - 2) >> 1;
 945                 int got;
 946                 FILE *fp;
 947
 948                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 949 #if defined(_WIN32)
 950                 filename[0] = '\0';
 951 #else
 952                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 953                 mkdir(filename, 0777);
 954 #endif
 955                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 956                 fp = fopen(filename, "r");
 957                 if (!fp) {
 958 fail:
 959                         print_info("failed to load game from '%s'\n", filename);
 960                         goto copy;
 961                 }
 962                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 963                 fclose(fp);
 964                 if (got != 2)
 965                         goto fail;
 966         }
 967
 968 copy:
 969         /* copy track */
 970         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 971 }
 972
 973 /* game writes track with saved game */
 974 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 975 {
 976         /* skip sync info that is provided by game and only relevant for a real disk track */
 977         data += 0x200;
 978         length -= 0x200;
 979
 980         if (length != sizeof(game_save[0])) {
 981                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 982                 return;
 983         }
 984
 985         /* don't save if last track is the same, because disk is written on both sides with the same data */
 986         if (track == last_track) {
 987                 if (memcmp(memory + data, game_save[track & 1], length)) {
 988                         print_error("saving game data on other side of the disk is different, please fix!\n");
 989                 }
 990                 return;
 991         }
 992         last_track = track;
 993
 994         /* save game data */
 995         memcpy(game_save[track & 1], memory + data, length);
 996
 997         /* if done with saving */
 998         if ((track & 1)) {
 999                 char filename[256];
1000                 int gamesave_num = (track - 2) >> 1;
1001                 int wrote;
1002                 FILE *fp;
1003
1004 #if defined(_WIN32)
1005                 filename[0] = '\0';
1006 #else
1007                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1008                 mkdir(filename, 0777);
1009 #endif
1010                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1011                 fp = fopen(filename, "w");
1012                 if (!fp) {
1013 fail:
1014                         print_error("failed to save game to '%s'\n", filename);
1015                         return;
1016                 }
1017                 print_info("Game state saved to '%s'\n", filename);
1018                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1019                 fclose(fp);
1020                 if (wrote != 2)
1021                         goto fail;
1022         }
1023 }
1024
1025 static int shift = 0, ctrl = 0;
1026
1027 static void keyboard_sdl(int down, enum keycode keycode)
1028 {
1029         switch (keycode) {
1030         case KEYCODE_LCTRL:
1031         case KEYCODE_RCTRL:
1032                 ctrl = down;
1033                 break;
1034         default: break;
1035         }
1036
1037         if (ctrl && down) {
1038                 switch (keycode) {
1039                 case KEYCODE_h:
1040                         if (help_view == help_views)
1041                                 help_view = 0;
1042                         else
1043                                 help_view++;
1044                         break;
1045                 case KEYCODE_v:
1046                         config_video_filter ^= 1;
1047                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1048                         break;
1049                 case KEYCODE_a:
1050                         config_audio_filter ^= 1;
1051                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1052                         break;
1053                 case KEYCODE_s:
1054                         config_amiga_speed ^= 1;
1055                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1056                         break;
1057                 case KEYCODE_r:
1058                         config_render ^= 1;
1059                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1060                         break;
1061                 case KEYCODE_b:
1062                         if (!config_render && !config_debug_opengl) {
1063                                 osd_info("", "not applicable");
1064                                 break;
1065                         }
1066                         if (config_benson_size == 0.5) {
1067                                 config_benson_size = 1.0;
1068                                 config_fov = FOV_NOVAGEN;
1069                         } else {
1070                                 config_benson_size = 0.5;
1071                                 config_fov = FOV_JOLLY;
1072                         }
1073                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1074                         break;
1075                 case KEYCODE_i:
1076                         if (!intro_skipped)
1077                                 skip_intro();
1078                         else
1079                                 osd_info("", "not applicable");
1080                         break;
1081                 case KEYCODE_c:
1082                         if (config_ctrl_c)
1083                                 quit = 1;
1084                         break;
1085                 case KEYCODE_o:
1086 #ifdef HAVE_OVR
1087                         reset_observer_ovr();
1088                         osd_info("", "reset observer");
1089 #else
1090                         osd_info("", "not applicable");
1091 #endif
1092                         break;
1093                 case KEYCODE_KP_PLUS:
1094 #ifdef HAVE_OVR
1095                         osd_info("", "not applicable");
1096 #else
1097                         if (config_fov / 1.2 >= FOV_MIN)
1098                                 config_fov /= 1.2;
1099                         disp_fov:
1100                         {
1101                                 char text[16];
1102                                 sprintf(text, "%.2f", config_fov);
1103                                 osd_info("FOV", text);
1104                         }
1105 #endif
1106                         break;
1107                 case KEYCODE_KP_MINUS:
1108 #ifdef HAVE_OVR
1109                         osd_info("", "not applicable");
1110 #else
1111                         if (config_fov * 1.2 <= FOV_MAX)
1112                                 config_fov *= 1.2;
1113                         goto disp_fov;
1114 #endif
1115                         break;
1116                 default: break;
1117                 }
1118                 /* do not pass keys to game while holding CTRL */
1119                 return;
1120         }
1121
1122         if (keycode == KEYCODE_PAUSE && down) {
1123                 if (help_view == help_views)
1124                         help_view = 0;
1125                 else
1126                         help_view++;
1127         }
1128
1129         /* in help view we must not forward keypresses */
1130         if (help_view)
1131                 return;
1132
1133         switch (keycode) {
1134         case KEYCODE_LSHIFT:
1135                 set_amiga_key(keycode, down);
1136                 shift = down;
1137                 break;
1138         case KEYCODE_RSHIFT:
1139                 set_amiga_key(keycode, down);
1140                 shift = down;
1141                 break;
1142         case KEYCODE_LEFT:
1143                 if (shift && down) {
1144                         set_amiga_key(keycode, down);
1145                         set_joystick(-1, -1, -1, -1, -1);
1146                         break;
1147                 }
1148                 set_amiga_key(keycode, 0);
1149                 set_joystick(down, -1, -1, -1, -1);
1150                 break;
1151         case KEYCODE_RIGHT:
1152                 if (shift && down) {
1153                         set_amiga_key(keycode, down);
1154                         set_joystick(-1, -1, -1, -1, -1);
1155                         break;
1156                 }
1157                 set_amiga_key(keycode, 0);
1158                 set_joystick(-1, down, -1, -1, -1);
1159                 break;
1160         case KEYCODE_UP:
1161                 if (shift && down) {
1162                         set_amiga_key(keycode, down);
1163                         set_joystick(-1, -1, -1, -1, -1);
1164                         break;
1165                 }
1166                 set_amiga_key(keycode, 0);
1167                 set_joystick(-1, -1, down, -1, -1);
1168                 break;
1169         case KEYCODE_DOWN:
1170                 if (shift && down) {
1171                         set_amiga_key(keycode, down);
1172                         set_joystick(-1, -1, -1, -1, -1);
1173                         break;
1174                 }
1175                 set_amiga_key(keycode, 0);
1176                 set_joystick(-1, -1, -1, down, -1);
1177                 break;
1178         case KEYCODE_END:
1179                 set_joystick(-1, -1, -1, -1, down);
1180                 break;
1181         case KEYCODE_INSERT:
1182                 set_amiga_key(KEYCODE_HELP, down);
1183                 break;
1184         default:
1185                 set_amiga_key(keycode, down);
1186         }
1187 }
1188
1189 void audio_sdl(float *data, int length)
1190 {
1191         int fill, s;
1192
1193         /* read sound from sound buffer
1194          * buffer pointer read and write is atomic, so no locking required!
1195          */
1196         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1197         if (fill < length) {
1198 #ifdef DEBUG_SOUND_BUFFERING
1199                 fprintf(stderr, "sound buffer underrun\n");
1200 #endif
1201                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1202                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1203         }
1204         for (s = 0; s < length; s++) {
1205                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1206                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1207         }
1208 #ifdef DEBUG_SOUND_BUFFERING
1209         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1210 #endif
1211         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1212 }
1213
1214 void sound_irq(void)
1215 {
1216         /* trigger and execute IRQ 4 = sound */
1217         execute_cpu(4, NULL);
1218 }
1219
1220 int main(int argc, char *argv[])
1221 {
1222         int rc;
1223         int sdl_sound_chunk;
1224
1225         home_dir = getenv("HOME");
1226         if (!home_dir)
1227                 home_dir = "";
1228
1229         rc = parse_args(argc, argv);
1230         if (rc)
1231                 return 0;
1232
1233         /* allocate image */
1234         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1235         if (!image) {
1236                 print_error("Failed to allocate image buffer\n");
1237                 goto done;
1238         }
1239
1240         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1241                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1242                 goto done;
1243         }
1244         if ((1000 % IRQ_RATE)) {
1245                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1246                 goto done;
1247         }
1248
1249         /* calculate SDL chunk size for audio
1250          * it must be a power of two, but not more than the chunk size for each IRQ!
1251          */
1252         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1253                 ;
1254         sdl_sound_chunk >>= 1;
1255 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1256
1257         /* allocate sound buffers */
1258         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1259         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1260         if (!sound_buffer) {
1261                 print_error("Failed to allocate image buffer\n");
1262                 goto done;
1263         }
1264
1265         /* allocate memory */
1266         memory = calloc(MEMORY_SIZE, 1);
1267         if (!memory) {
1268                 print_error("Failed to allocate cpu's memory\n");
1269                 goto done;
1270         }
1271         stop_event = calloc(MEMORY_SIZE, 1);
1272         if (!stop_event) {
1273                 print_error("Failed to allocate cpu's stop_event memory\n");
1274                 goto done;
1275         }
1276         chipreg = calloc(IOSIZE, 1);
1277         if (!chipreg) {
1278                 print_error("Failed to allocate chip register\n");
1279                 goto done;
1280         }
1281
1282         /* init cpu code */
1283         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1284
1285         /* init disk emulation */
1286         disk_init(disk_read, disk_write);
1287
1288         /* load binary */
1289         mercenary_load();
1290
1291         /* patch some stuff */
1292         mercenary_patch();
1293
1294         /* init SDL and OpenGL */
1295 #ifdef HAVE_OVR
1296         int vbl_sync = 0;
1297         int vr = 1;
1298         int multisampling = 0;
1299         window_width = SCREEN_WIDTH;
1300         window_height = SCREEN_HEIGHT;
1301 #else
1302         int vbl_sync = 1;
1303         int vr = 0;
1304         int multisampling = config_multisampling;
1305         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1306         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1307 #endif
1308         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1309         if (rc < 0)
1310                 goto done;
1311 #ifdef HAVE_OVR
1312         rc = init_ovr(config_multisampling);
1313         if (rc < 0)
1314                 goto done;
1315         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1316         if (rc < 0)
1317                 goto done;
1318 #endif
1319         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1320         if (rc < 0)
1321                 goto done;
1322
1323         /* init osd */
1324         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1325         if (rc < 0)
1326                 goto done;
1327         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1328         if (rc < 0)
1329                 goto done;
1330         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1331         if (!help_osd[0])
1332                 goto done;
1333         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1334         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1335                 "Emulation:\n"
1336                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1337                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1338                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1339                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1340                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1341                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1342                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1343                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1344                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1345 #ifdef HAVE_OVR
1346                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1347 #endif
1348                 "\n"
1349                 "Answer to a Question:\n"
1350                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1351                 "\n"
1352                 "Walking / Driving / Flying:\n"
1353                 "        Use cursor keys as joystick, to move player / craft.\n"
1354                 "        Press `R' for running, 'W' for walking speed.\n"
1355                 "        Press `B' to board, `L' to leave.\n"
1356                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1357                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1358                 "        Press `SPACE' to stop craft.\n"
1359                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1360                 "        Press `T' for turbo on certain craft.\n"
1361                 "        Press `END' as joystick's fire button.\n"
1362                 "\n"
1363                 "Elevator:\n"
1364                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1365                 "\n"
1366                 "Inside a transporter:\n"
1367                 "        Press `1'...`0' to select destination.\n"
1368                 "\n"
1369                 "Items:\n"
1370                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1371                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1372                 "        Press `NUMPAD Enter' to select certain items.\n"
1373                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1374                 "        Press `NUMPAD *' to read entry\n"
1375                 "Saving / Loading / Pause:\n"
1376                 "        Press `INSERT' to loading and saving options.\n"
1377                 "        Press `ENTER' to pause game, other key to continue.\n"
1378                 ,HELP_ALPHA, 1, 2, 5, 0);
1379 #ifdef HAVE_OVR
1380         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1381         if (!help_osd[1])
1382                 goto done;
1383         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);
1384         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1385                 "Emulation using Controller:\n"
1386                 "        Press `Enter' button to toggle this help screen on or off.\n"
1387                 "        Press `A' button to emulate keyboard to control game.\n"
1388                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1389                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1390                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1391                 "        Pull `Trigger' on right controller enter the highlighted key.\n"
1392                 "        Pull `Trigger' on both controllers to reset observer position.\n"
1393                 "\n"
1394                 "Walking / Driving / Flying using Controller:\n"
1395                 "        Use thumb stick on right controller, to move player / craft.\n"
1396                 "        Point right controller towards the direction to walk to.\n"
1397                 "        Press thumb stick to change orientation to that direction.\n"
1398                 "        Press `X' button to board, `Y' button to leave.\n"
1399                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1400                 "        Press thumb stick on left controller stop craft.\n"
1401                 "        Press thumb stick on left controller for escape sequence, after stop.\n"
1402                 "        Pull `Trigger' on right controller to fire.\n"
1403                 "\n"
1404                 "For all other game function, use the emulated keyboards!\n"
1405                 ,HELP_ALPHA, 1, 2, 5, 0);
1406         help_views = 2;
1407 #endif
1408         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1409         if (!info_osd)
1410                 goto done;
1411
1412         /* init audio */
1413         sound_init(SOUND_SAMPLERATE, sound_irq);
1414
1415         /* start cpu */
1416         reset_cpu();
1417
1418         if (config_skip_intro)
1419                 skip_intro();
1420
1421         /* run game */
1422         main_loop();
1423
1424 done:
1425         exit_opengl();
1426 #ifdef HAVE_OVR
1427         exit_ovr();
1428 #endif
1429         exit_sdl();
1430
1431         if (chipreg)
1432                 free(chipreg);
1433         if (stop_event)
1434                 free(stop_event);
1435         if (memory)
1436                 free(memory);
1437         if (sound_buffer)
1438                 free(sound_buffer);
1439         if (image)
1440                 free(image);
1441         if (help_osd[0])
1442                 free(help_osd[0]);
1443         if (help_osd[1])
1444                 free(help_osd[1]);
1445         if (info_osd)
1446                 free(info_osd);
1447
1448         return 0;
1449 }
1450