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 = 41.5; /* inch */
  75 #ifdef HAVE_OVR
  76 static double config_keyboard_distance = 40.5; /* inch */
  77 static double config_keyboard_height = -26.0; /* inch */
  78 #endif
  79 static int config_debug_transparent = 0;
  80 static int config_debug_opengl = 0;
  81 /* render improvements */
  82 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  83 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  84 static int config_improve_stars_rotation = 1;   /* set to 1 to improve star rendering */
  85 static int config_improve_fix_sky_rotation = 0; /* set to 1 to fix sky rotation */
  86 static int config_improve_round_planets = 0;    /* set to 1 to make planets exactly round */
  87
  88 #define CPU_SPEED       7093790.0;
  89
  90 #define SOUND_SAMPLERATE 48000
  91 /* - game IRQ rate
  92  * - must be used for sound rendering chunk
  93  */
  94 #define IRQ_RATE        50
  95 /* numbe of buffer chunks to dejitter:
  96  * - SDL render interval
  97  * - sound rendering interval
  98  * - sound card interval
  99  * 4 should be minimum, if video rate is >=50 Hz
 100  */
 101 #define SOUND_CHUNKS    4
 102
 103 /* test sound to check if buffer does not overflow / underrun */
 104 //#define DEBUG_SOUND_BUFFERING
 105
 106 #define IOSIZE          0x1000 /* bytes in io space */
 107 #define MEMORY_SIZE     0x80000
 108 static uint8_t *memory = NULL;
 109 static uint8_t *stop_event = NULL;
 110 static uint8_t *image = NULL;
 111 static uint8_t *help_osd[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 = thrust_last;
 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_thumb) {
 398                 /* reset observer */
 399                 reset_observer_ovr();
 400                 osd_info("", "reset observer");
 401         }
 402         if (!help_view) {
 403                 if (button_x && !button_x_last) {
 404                         /* 'board' pressed */
 405                         set_amiga_key(KEYCODE_b, 1);
 406                         set_amiga_key(KEYCODE_b, 0);
 407                         /* important: get rid of old state */
 408                         thrust = 0;
 409                 }
 410                 if (button_y && !button_y_last) {
 411                         /* 'leave' pressed */
 412                         set_amiga_key(KEYCODE_l, 1);
 413                         set_amiga_key(KEYCODE_l, 0);
 414                 }
 415                 if (button_right_trigger && !button_right_trigger_last) {
 416                         /* trigger pressed */
 417                         if (keyboard_on) {
 418                                 if (vr_key) {
 419                                         vr_key_pressed = vr_key;
 420                                         set_amiga_key(vr_key_pressed, 1);
 421                                 }
 422                         } else
 423                         if (mercenary_get_info_walking()) {
 424                                 /* change orientation */
 425                                 double roll, pitch, yaw;
 426                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 427                                 mercenary_set_orientation(yaw + hand_right_yaw);
 428                         } else {
 429                                 /* fire button */
 430                                 set_joystick(-1, -1, -1, -1, 1);
 431                         }
 432                 }
 433                 if (!button_right_trigger && button_right_trigger_last) {
 434                         /* trigger released */
 435                         set_joystick(-1, -1, -1, -1, 0);
 436                         if (vr_key_pressed) {
 437                                 set_amiga_key(vr_key_pressed, 0);
 438                                 vr_key_pressed = 0;
 439                         }
 440                 }
 441                 /* joystick */
 442                 /* reset moving state, so the game is not influenced before we want to */
 443                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 444                 joystick_set_x = 0;
 445                 joystick_set_y = 0;
 446                 if (!mercenary_get_info_walking()) {
 447                         /* turn right and left when not walking */
 448                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 449                                 set_joystick(0, 1, -1, -1, -1);
 450                                 joystick_set_x = 1;
 451                         } else
 452                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 453                                 set_joystick(1, 0, -1, -1, -1);
 454                                 joystick_set_x = 1;
 455                         }
 456                         /* pitch craft */
 457                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 458                                 set_joystick(-1, -1, 1, 0, -1);
 459                                 joystick_set_y = 1;
 460                         } else
 461                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 462                                 set_joystick(-1, -1, 0, 1, -1);
 463                                 joystick_set_y = 1;
 464                         }
 465                         if (joystick_set_x || joystick_set_y) {
 466                                 mercenary_vr_move(0, NULL, NULL,
 467                                         256,
 468                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 469                         }
 470                 } else {
 471                         double roll, pitch, yaw;
 472                         double dist, dir, east, north;
 473                         int32_t move_east[4], move_north[4];
 474
 475                         /* check if we push the stick */
 476                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 477                         if (dist > STICK_WALK_THRESHOLD) {
 478                                 /* get stick amplitude (dist) and direction (dir) */
 479                                 if (dist > 1.0)
 480                                         dist = 1.0;
 481                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 482                                 dir = atan2(stick_right_x, stick_right_y);
 483                                 /* use hand direction to get actual stick direction */
 484                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 485                                 if (dir < -M_PI)
 486                                         dir += M_PI * 2.0;
 487                                 if (dir > M_PI)
 488                                         dir -= M_PI * 2.0;
 489                                 /* flip directin, if we walk backwards */
 490                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 491                                         /* go backwards */
 492                                         set_joystick(-1, -1, 0, 1, -1);
 493                                         joystick_set_y = 1;
 494                                 } else {
 495                                         /* go forward */
 496                                         set_joystick(-1, -1, 1, 0, -1);
 497                                         joystick_set_y = 1;
 498                                 }
 499                                 joystick_set_y = 1;
 500                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 501                                 east = sin(yaw - dir + M_PI) * dist;
 502                                 north = -cos(yaw - dir + M_PI) * dist;
 503                                 /* calculatate the integer positions of 4 steps */
 504                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 505                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 506                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 507                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 508                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 509                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 510                                 move_east[3] = (int32_t)(east + 0.5);
 511                                 move_north[3] = (int32_t)(north + 0.5);
 512                                 /* calculate the delta between each of the 4 step */
 513                                 move_east[3] -= move_east[2];
 514                                 move_north[3] -= move_north[2];
 515                                 move_east[2] -= move_east[1];
 516                                 move_north[2] -= move_north[1];
 517                                 move_east[1] -= move_east[0];
 518                                 move_north[1] -= move_north[0];
 519                                 /* the game takes 4 steps to move the player */
 520                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 521                         }
 522                 }
 523                 if (joystick_set_x_last && !joystick_set_x)
 524                         set_joystick(0, 0, -1, -1, -1);
 525                 if (joystick_set_y_last && !joystick_set_y)
 526                         set_joystick(-1, -1, 0, 0, -1);
 527                 /* thrust */
 528                 /* button to toggle between stop and escape */
 529                 if (button_left_trigger && !button_left_trigger_last) {
 530                         /* 'escape' pressed */
 531                         if (thrust_last == 0)
 532                                 thrust = -99;
 533                         else
 534                                 thrust = 0;
 535                 }
 536                 /* get stick to increment or decrement thrust */
 537                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 538                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 539                 else
 540                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 541                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 542                 else
 543                         increment = 0;
 544                 current_time = ticks_sdl();
 545                 if (increment) {
 546                         diff = current_time - last_time;
 547                         inc_count += increment * diff;
 548                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 549                                 thrust++;
 550                                 inc_count = 0.0;
 551                         }
 552                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 553                                 thrust--;
 554                                 inc_count = 0.0;
 555                         }
 556                 } else {
 557                         inc_count = 0;
 558                 }
 559                 last_time = current_time;
 560                 /* send thrust change as keycodes */
 561                 if (thrust_last != thrust) {
 562                         if (thrust >= 10) {
 563                                 set_amiga_key(KEYCODE_0, 1);
 564                                 set_amiga_key(KEYCODE_0, 0);
 565                         } else
 566                         if (thrust <= -10 && thrust > -99) {
 567                                 set_amiga_key(KEYCODE_F10, 1);
 568                                 set_amiga_key(KEYCODE_F10, 0);
 569                         } else
 570                         if (thrust <= -99) {
 571                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 572                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 573                         } else
 574                         if (thrust > 0) {
 575                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 576                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 577                         } else
 578                         if (thrust < 0) {
 579                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 580                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 581                         } else {
 582                                 set_amiga_key(KEYCODE_SPACE, 1);
 583                                 set_amiga_key(KEYCODE_SPACE, 0);
 584                         }
 585                 }
 586         }
 587         button_a_last = button_a;
 588         button_b_last = button_b;
 589         button_x_last = button_x;
 590         button_y_last = button_y;
 591         button_menu_last = button_menu;
 592         button_left_trigger_last = button_left_trigger;
 593         button_right_trigger_last = button_right_trigger;
 594         button_left_thumb_last = button_left_thumb;
 595         button_right_thumb_last = button_right_thumb;
 596         stick_left_x_last = stick_left_x;
 597         stick_left_y_last = stick_left_y;
 598         stick_right_x_last = stick_right_x;
 599         stick_right_y_last = stick_right_y;
 600         thrust_last = thrust;
 601         joystick_set_x_last = joystick_set_x;
 602         joystick_set_y_last = joystick_set_y;
 603
 604         /* we must handle keyboard after toggeling keyboard_on,
 605          * so that keyboard_on will not change until keyboard is rendered */
 606         vr_key = 0;
 607         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 608 }
 609 #endif
 610
 611 static void skip_intro(void)
 612 {
 613         int event;
 614         double render_delay = 0.0;
 615         double cycle_count;
 616
 617         if (intro_skipped)
 618                 return;
 619
 620         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 621         do {
 622                 /* render, if not delayed */
 623                 if (render_delay <= 0.0) {
 624                         cycle_count = 0;
 625                         do {
 626                                 cycle_count += execute_cpu(0, &event);
 627                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 628                         render_delay += (double)cycle_count / CPU_SPEED;
 629                 }
 630                 /* VBL */
 631                 execute_cpu(3, NULL);
 632                 /* count down render delay */
 633                 if (render_delay) {
 634                         render_delay -= 1.0 / (double)IRQ_RATE;
 635                         if (render_delay < 0.0)
 636                                 render_delay = 0.0;
 637                 }
 638         } while (event != STOP_AT_CLEAR_SCREEN1);
 639
 640         intro_skipped = 1;
 641 }
 642
 643 static void special_event(int event)
 644 {
 645 #ifdef HAVE_OVR
 646         /* handle VR events */
 647         if (event == STOP_AT_PATCH_VR) {
 648                 mercenary_patch_vr();
 649                 return;
 650         }
 651 #endif
 652         /* handle events to improve rendering */
 653         if (render_improved)
 654                 render_capture_event(event);
 655 }
 656
 657 static void main_loop(void)
 658 {
 659         double frame_step, frame_time = 0.0, frame_render = 1;
 660         int had_first_irq = 0;
 661         static uint32_t current_time, last_time = 0, diff;
 662         int i, rc;
 663         int space, length;
 664         int cycle_count, event = STOP_AT_END;
 665         double render_delay = 0.0;
 666         uint32_t palette_address;
 667         uint16_t palette[16];
 668         int all_white = 0;
 669 #ifdef HAVE_OVR
 670         int eye;
 671         int vr = 1;
 672 #else
 673         int vr = 0;
 674 #endif
 675
 676         last_time = ticks_sdl();
 677
 678         /* render result on window */
 679         while (!quit) {
 680 #ifdef HAVE_OVR
 681                 /* get vr poses */
 682                 handle_vr_poses();
 683 #endif
 684                 /* if we are in interstellar fligt, we use 50 Hz */
 685                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 686                 /* else we use whatever frame rate the user wants */
 687                 if (render_capture_is_interstellar())
 688                         frame_step = vbl_duration * 50.0;
 689                 else if (!intro_skipped)
 690                         frame_step = vbl_duration * 10.0;
 691                 else
 692                         frame_step = vbl_duration * config_fps;
 693                 if (frame_step > 1.0)
 694                         frame_step = 1.0;
 695                 /* handle SDL events */
 696                 rc = event_sdl();
 697                 if (rc)
 698                         break;
 699
 700                 /* initialize rendering */
 701                 debug_opengl = config_debug_opengl;
 702                 benson_size = config_benson_size;
 703                 render_legacy = (!config_render) || debug_opengl;
 704                 render_improved = config_render || debug_opengl;
 705                 if (!render_improved) {
 706                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 707                         render_capture_reset();
 708                 }
 709                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 710                 /* amgia speed: don't render if we still delay */
 711                 /* non amiga speed: render if we need a new frame */
 712                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 713                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 714                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 715                 if (((frame_render && !config_amiga_speed)
 716                   || (config_amiga_speed && render_delay <= 0.0)
 717                   || event == STOP_AT_WAIT_INPUT)
 718                 && !(had_first_irq && help_view)) {
 719                         frame_render = 0;
 720                         /* start capturing for improved graphics */
 721                         if (render_improved)
 722                                 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);
 723
 724                         /* execute until the rendered image is ready (wait for VBL) */
 725                         cycle_count = 0;
 726                         do {
 727                                 cycle_count += execute_cpu(0, &event);
 728                                 /* handle special events */
 729                                 special_event(event);
 730                                 if (event == STOP_AT_CLEAR_SCREEN1)
 731                                         intro_skipped = 1;
 732                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 733                         /* stop capturing for improved graphics */
 734                         if (render_improved)
 735                                 render_capture_stop();
 736                         /* copy palette */
 737                         palette_address = mercenary_palette_view();
 738                         for (i = 0; i < 16; i++)
 739                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 740                         /* for amiga speed: set delay by the number of cycles */
 741                         if (config_amiga_speed)
 742                                 render_delay += (double)cycle_count / CPU_SPEED;
 743                 }
 744
 745                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 746 #ifdef HAVE_OVR
 747                 begin_render_ovr();
 748
 749                 for (eye = 0; eye < 2; eye++) {
 750                         double camera_x, camera_y, camera_z;
 751                         /* begin of rendering eye, viewport and frustum is set here */
 752                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 753 #else
 754                 {
 755 #endif
 756                         /* clear screen */
 757                         opengl_clear(vr);
 758                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 759                         if (render_improved) {
 760 #ifndef HAVE_OVR
 761                                 /* viewport and frustum is set here */
 762                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 763 #endif
 764                                 /* render improved graphics, interpolate, if required,
 765                                  * if no item list is available, for legacy rendering
 766                                  */
 767                                 if (all_white)
 768                                         rc = render_all_white(vr);
 769                                 else
 770                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 771                                 if (rc)
 772                                         goto goto_legacy;
 773                                 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);
 774                                 if (help_view)
 775                                         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);
 776                                 if (osd_timer) {
 777                                         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);
 778                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 779                                                 osd_timer = 0;
 780                                 }
 781                         }
 782                         /* setup viewport for legacy image and render image, if enabled */
 783                         /* also render legacy, if render_improved failed due to not (yet) available items */
 784                         if (render_legacy) {
 785                                 goto_legacy:
 786                                 /* render game view without benson
 787                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 788                                  */
 789                                 if (had_first_irq)
 790                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 791 #ifndef HAVE_OVR
 792                                 /* viewport and frustum is set here */
 793                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 794 #endif
 795                                 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);
 796                                 if (help_view)
 797                                         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);
 798                                 if (osd_timer) {
 799                                         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);
 800                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 801                                                 osd_timer = 0;
 802                                 }
 803                         }
 804 #ifdef HAVE_OVR
 805                         /* render keyboard */
 806                         if (keyboard_on)
 807                                 render_vr_keyboard(camera_x, camera_y);
 808
 809                         /* end of rendering eye */
 810                         end_render_ovr_eye(eye);
 811                 }
 812                 /* at this point we are ready with our image, so we display */
 813                 end_render_ovr();
 814                 render_mirror_ovr(window_width, window_height);
 815 #else
 816                 }
 817 #endif
 818                 swap_sdl();
 819
 820                 /* advance frame time, if we are not in help view  */
 821                 if (!(had_first_irq && help_view)) {
 822                         frame_time += frame_step;
 823                         if (frame_time >= 1.0) {
 824                                 frame_time -= 1.0;
 825                                 frame_render = 1;
 826                         }
 827                 }
 828
 829                 /* measure frame rate */
 830                 framerate_measure();
 831
 832                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 833                 /* only do this, if we are not in help view */
 834                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 835                 if (!(had_first_irq && help_view)) {
 836                         current_time = ticks_sdl();
 837                         diff = current_time - last_time;
 838                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 839                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 840                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 841                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 842                         }
 843                         while (diff > 1000 / IRQ_RATE) {
 844                                 /* trigger and execute IRQ 3 = VBL */
 845                                 execute_cpu(3, NULL);
 846                                 had_first_irq = 1;
 847                                 /* transfer benson without game view
 848                                  * because we only got benson refreshed during VBL IRQ
 849                                  */
 850                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 851                                 /* render sound to sound buffer
 852                                  * buffer pointer read and write is atomic, so no locking required!
 853                                  */
 854                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 855                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 856 #ifdef DEBUG_SOUND_BUFFERING
 857                                         fprintf(stderr, "sound buffer overflow\n");
 858 #endif
 859                                         length = space;
 860                                 } else
 861                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 862 #ifdef DEBUG_SOUND_BUFFERING
 863                                 printf("can write %d, write %d\n", space, length);
 864                                 static int cnt = 0;
 865                                 int s;
 866                                 for (s = 0; s < length; s++) {
 867                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 868                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 869                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 870                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 871                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 872                                          cnt++;
 873                                 }
 874 #else
 875                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 876 #endif
 877                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 878                                 diff -= 1000 / IRQ_RATE;
 879                                 last_time += 1000 / IRQ_RATE;
 880
 881                                 /* count down render delay */
 882                                 if (render_delay) {
 883                                         render_delay -= 1.0 / (double)IRQ_RATE;
 884                                         if (render_delay < 0.0)
 885                                                 render_delay = 0.0;
 886                                 }
 887                         }
 888                 }
 889         }
 890 }
 891
 892 static uint16_t io_read(uint32_t address)
 893 {
 894         uint16_t value = 0xffff;
 895
 896         /* joystick and fire button */
 897         if (address == 0xbfe000 || address == 0xdff00c)
 898                 value &= emulate_joystick_read(address);
 899         /* keyboard */
 900         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 901                 value &= emulate_keyboard_read(address);
 902         /* diskette */
 903         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 904                 value &= emulate_disk_read(address);
 905
 906         return value;
 907 }
 908
 909 static void io_write(uint32_t address, uint16_t value)
 910 {
 911         /* dmacon and sound registers */
 912         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 913                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 914         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 915                 emulate_disk_write(address, value);
 916 }
 917
 918 /* two tracks with 0x1820 words of length */
 919 static uint8_t game_save[2][0x1820 << 1];
 920 static int last_track = 0;
 921
 922 /* game reads track with saved game */
 923 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 924 {
 925         if (length > sizeof(game_save[0])) {
 926                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 927                 return;
 928         }
 929
 930         /* if even track is selected, load game */
 931         if (!(track & 1)) {
 932                 char filename[256];
 933                 int gamesave_num = (track - 2) >> 1;
 934                 int got;
 935                 FILE *fp;
 936
 937                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 938 #if defined(_WIN32)
 939                 filename[0] = '\0';
 940 #else
 941                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 942                 mkdir(filename, 0777);
 943 #endif
 944                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 945                 fp = fopen(filename, "r");
 946                 if (!fp) {
 947 fail:
 948                         print_info("failed to load game from '%s'\n", filename);
 949                         goto copy;
 950                 }
 951                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 952                 fclose(fp);
 953                 if (got != 2)
 954                         goto fail;
 955         }
 956
 957 copy:
 958         /* copy track */
 959         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 960 }
 961
 962 /* game writes track with saved game */
 963 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 964 {
 965         /* skip sync info that is provided by game and only relevant for a real disk track */
 966         data += 0x200;
 967         length -= 0x200;
 968
 969         if (length != sizeof(game_save[0])) {
 970                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 971                 return;
 972         }
 973
 974         /* don't save if last track is the same, because disk is written on both sides with the same data */
 975         if (track == last_track) {
 976                 if (memcmp(memory + data, game_save[track & 1], length)) {
 977                         print_error("saving game data on other side of the disk is different, please fix!\n");
 978                 }
 979                 return;
 980         }
 981         last_track = track;
 982
 983         /* save game data */
 984         memcpy(game_save[track & 1], memory + data, length);
 985
 986         /* if done with saving */
 987         if ((track & 1)) {
 988                 char filename[256];
 989                 int gamesave_num = (track - 2) >> 1;
 990                 int wrote;
 991                 FILE *fp;
 992
 993 #if defined(_WIN32)
 994                 filename[0] = '\0';
 995 #else
 996                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 997                 mkdir(filename, 0777);
 998 #endif
 999                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1000                 fp = fopen(filename, "w");
1001                 if (!fp) {
1002 fail:
1003                         print_error("failed to save game to '%s'\n", filename);
1004                         return;
1005                 }
1006                 print_info("Game state saved to '%s'\n", filename);
1007                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1008                 fclose(fp);
1009                 if (wrote != 2)
1010                         goto fail;
1011         }
1012 }
1013
1014 static int shift = 0, ctrl = 0;
1015
1016 static void keyboard_sdl(int down, enum keycode keycode)
1017 {
1018         switch (keycode) {
1019         case KEYCODE_LCTRL:
1020         case KEYCODE_RCTRL:
1021                 ctrl = down;
1022                 break;
1023         default: break;
1024         }
1025
1026         if (ctrl && down) {
1027                 switch (keycode) {
1028                 case KEYCODE_h:
1029                         if (help_view == help_views)
1030                                 help_view = 0;
1031                         else
1032                                 help_view++;
1033                         break;
1034                 case KEYCODE_v:
1035                         config_video_filter ^= 1;
1036                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1037                         break;
1038                 case KEYCODE_a:
1039                         config_audio_filter ^= 1;
1040                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1041                         break;
1042                 case KEYCODE_s:
1043                         config_amiga_speed ^= 1;
1044                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1045                         break;
1046                 case KEYCODE_r:
1047                         config_render ^= 1;
1048                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1049                         break;
1050                 case KEYCODE_b:
1051                         if (!config_render && !config_debug_opengl) {
1052                                 osd_info("", "not applicable");
1053                                 break;
1054                         }
1055                         if (config_benson_size == 0.5) {
1056                                 config_benson_size = 1.0;
1057                                 config_fov = FOV_NOVAGEN;
1058                         } else {
1059                                 config_benson_size = 0.5;
1060                                 config_fov = FOV_JOLLY;
1061                         }
1062                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1063                         break;
1064                 case KEYCODE_i:
1065                         if (!intro_skipped)
1066                                 skip_intro();
1067                         else
1068                                 osd_info("", "not applicable");
1069                         break;
1070                 case KEYCODE_c:
1071                         if (config_ctrl_c)
1072                                 quit = 1;
1073                         break;
1074                 case KEYCODE_o:
1075 #ifdef HAVE_OVR
1076                         reset_observer_ovr();
1077                         osd_info("", "reset observer");
1078 #else
1079                         osd_info("", "not applicable");
1080 #endif
1081                         break;
1082                 case KEYCODE_KP_PLUS:
1083 #ifdef HAVE_OVR
1084                         osd_info("", "not applicable");
1085 #else
1086                         if (config_fov / 1.2 >= FOV_MIN)
1087                                 config_fov /= 1.2;
1088                         disp_fov:
1089                         {
1090                                 char text[16];
1091                                 sprintf(text, "%.2f", config_fov);
1092                                 osd_info("FOV", text);
1093                         }
1094 #endif
1095                         break;
1096                 case KEYCODE_KP_MINUS:
1097 #ifdef HAVE_OVR
1098                         osd_info("", "not applicable");
1099 #else
1100                         if (config_fov * 1.2 <= FOV_MAX)
1101                                 config_fov *= 1.2;
1102                         goto disp_fov;
1103 #endif
1104                         break;
1105                 default: break;
1106                 }
1107                 /* do not pass keys to game while holding CTRL */
1108                 return;
1109         }
1110
1111         if (keycode == KEYCODE_PAUSE && down) {
1112                 if (help_view == help_views)
1113                         help_view = 0;
1114                 else
1115                         help_view++;
1116         }
1117
1118         /* in help view we must not forward keypresses */
1119         if (help_view)
1120                 return;
1121
1122         switch (keycode) {
1123         case KEYCODE_LSHIFT:
1124                 set_amiga_key(keycode, down);
1125                 shift = down;
1126                 break;
1127         case KEYCODE_RSHIFT:
1128                 set_amiga_key(keycode, down);
1129                 shift = down;
1130                 break;
1131         case KEYCODE_LEFT:
1132                 if (shift && down) {
1133                         set_amiga_key(keycode, down);
1134                         set_joystick(-1, -1, -1, -1, -1);
1135                         break;
1136                 }
1137                 set_amiga_key(keycode, 0);
1138                 set_joystick(down, -1, -1, -1, -1);
1139                 break;
1140         case KEYCODE_RIGHT:
1141                 if (shift && down) {
1142                         set_amiga_key(keycode, down);
1143                         set_joystick(-1, -1, -1, -1, -1);
1144                         break;
1145                 }
1146                 set_amiga_key(keycode, 0);
1147                 set_joystick(-1, down, -1, -1, -1);
1148                 break;
1149         case KEYCODE_UP:
1150                 if (shift && down) {
1151                         set_amiga_key(keycode, down);
1152                         set_joystick(-1, -1, -1, -1, -1);
1153                         break;
1154                 }
1155                 set_amiga_key(keycode, 0);
1156                 set_joystick(-1, -1, down, -1, -1);
1157                 break;
1158         case KEYCODE_DOWN:
1159                 if (shift && down) {
1160                         set_amiga_key(keycode, down);
1161                         set_joystick(-1, -1, -1, -1, -1);
1162                         break;
1163                 }
1164                 set_amiga_key(keycode, 0);
1165                 set_joystick(-1, -1, -1, down, -1);
1166                 break;
1167         case KEYCODE_END:
1168                 set_joystick(-1, -1, -1, -1, down);
1169                 break;
1170         case KEYCODE_INSERT:
1171                 set_amiga_key(KEYCODE_HELP, down);
1172                 break;
1173         default:
1174                 set_amiga_key(keycode, down);
1175         }
1176 }
1177
1178 void audio_sdl(float *data, int length)
1179 {
1180         int fill, s;
1181
1182         /* read sound from sound buffer
1183          * buffer pointer read and write is atomic, so no locking required!
1184          */
1185         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1186         if (fill < length) {
1187 #ifdef DEBUG_SOUND_BUFFERING
1188                 fprintf(stderr, "sound buffer underrun\n");
1189 #endif
1190                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1191                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1192         }
1193         for (s = 0; s < length; s++) {
1194                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1195                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1196         }
1197 #ifdef DEBUG_SOUND_BUFFERING
1198         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1199 #endif
1200         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1201 }
1202
1203 void sound_irq(void)
1204 {
1205         /* trigger and execute IRQ 4 = sound */
1206         execute_cpu(4, NULL);
1207 }
1208
1209 int main(int argc, char *argv[])
1210 {
1211         int rc;
1212         int sdl_sound_chunk;
1213
1214         home_dir = getenv("HOME");
1215         if (!home_dir)
1216                 home_dir = "";
1217
1218         rc = parse_args(argc, argv);
1219         if (rc)
1220                 return 0;
1221
1222         /* allocate image */
1223         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1224         if (!image) {
1225                 print_error("Failed to allocate image buffer\n");
1226                 goto done;
1227         }
1228
1229         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1230                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1231                 goto done;
1232         }
1233         if ((1000 % IRQ_RATE)) {
1234                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1235                 goto done;
1236         }
1237
1238         /* calculate SDL chunk size for audio
1239          * it must be a power of two, but not more than the chunk size for each IRQ!
1240          */
1241         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1242                 ;
1243         sdl_sound_chunk >>= 1;
1244 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1245
1246         /* allocate sound buffers */
1247         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1248         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1249         if (!sound_buffer) {
1250                 print_error("Failed to allocate image buffer\n");
1251                 goto done;
1252         }
1253
1254         /* allocate memory */
1255         memory = calloc(MEMORY_SIZE, 1);
1256         if (!memory) {
1257                 print_error("Failed to allocate cpu's memory\n");
1258                 goto done;
1259         }
1260         stop_event = calloc(MEMORY_SIZE, 1);
1261         if (!stop_event) {
1262                 print_error("Failed to allocate cpu's stop_event memory\n");
1263                 goto done;
1264         }
1265         chipreg = calloc(IOSIZE, 1);
1266         if (!chipreg) {
1267                 print_error("Failed to allocate chip register\n");
1268                 goto done;
1269         }
1270
1271         /* init cpu code */
1272         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1273
1274         /* init disk emulation */
1275         disk_init(disk_read, disk_write);
1276
1277         /* load binary */
1278         mercenary_load();
1279
1280         /* patch some stuff */
1281         mercenary_patch();
1282
1283         /* init SDL and OpenGL */
1284 #ifdef HAVE_OVR
1285         int vbl_sync = 0;
1286         int vr = 1;
1287         int multisampling = 0;
1288         window_width = SCREEN_WIDTH;
1289         window_height = SCREEN_HEIGHT;
1290 #else
1291         int vbl_sync = 1;
1292         int vr = 0;
1293         int multisampling = config_multisampling;
1294         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1295         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1296 #endif
1297         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, vr);
1298         if (rc < 0)
1299                 goto done;
1300 #ifdef HAVE_OVR
1301         rc = init_ovr(config_multisampling);
1302         if (rc < 0)
1303                 goto done;
1304         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1305         if (rc < 0)
1306                 goto done;
1307 #endif
1308         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1309         if (rc < 0)
1310                 goto done;
1311
1312         /* init osd */
1313         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1314         if (rc < 0)
1315                 goto done;
1316         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1317         if (rc < 0)
1318                 goto done;
1319         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1320         if (!help_osd[0])
1321                 goto done;
1322         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);
1323         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1324                 "Emulation:\n"
1325                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1326                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1327                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1328                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1329                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1330                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1331                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1332                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1333                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1334 #ifdef HAVE_OVR
1335                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1336 #endif
1337                 "\n"
1338                 "Answer to a Question:\n"
1339                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1340                 "\n"
1341                 "Walking / Driving / Flying:\n"
1342                 "        Use cursor keys as joystick, to move player / craft.\n"
1343                 "        Press `R' for running, 'W' for walking speed.\n"
1344                 "        Press `B' to board, `L' to leave.\n"
1345                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1346                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1347                 "        Press `SPACE' to stop craft.\n"
1348                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1349                 "        Press `T' for turbo on certain craft.\n"
1350                 "        Press `END' as joystick's fire button.\n"
1351                 "\n"
1352                 "Elevator:\n"
1353                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1354                 "\n"
1355                 "Inside a transporter:\n"
1356                 "        Press `1'...`0' to select destination.\n"
1357                 "\n"
1358                 "Items:\n"
1359                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1360                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1361                 "        Press `NUMPAD Enter' to select certain items.\n"
1362                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1363                 "        Press `NUMPAD *' to read entry\n"
1364                 "Saving / Loading / Pause:\n"
1365                 "        Press `INSERT' to loading and saving options.\n"
1366                 "        Press `ENTER' to pause game, other key to continue.\n"
1367                 ,HELP_ALPHA, 1, 2, 5, 0);
1368 #ifdef HAVE_OVR
1369         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1370         if (!help_osd[1])
1371                 goto done;
1372         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);
1373         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1374                 "Emulation using Controller:\n"
1375                 "        Press `Enter' button to toggle this help screen on or off.\n"
1376                 "        To have a virtual keyboard, point below benson (control pannel).\n"
1377                 "        Point to a key on keyboard. The key will highlight.\n"
1378                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1379                 "        Press thumb stick on left controller to reset observer position.\n"
1380                 "\n"
1381                 "Walking / Driving / Flying using Controller:\n"
1382                 "        Use thumb stick on right controller, to move player / craft.\n"
1383                 "        Point right controller towards the direction to walk to.\n"
1384                 "        Pull `Trigger' on right controller to change orientation.\n"
1385                 "        Press `X' button to board, `Y' button to leave.\n"
1386                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1387                 "        Pull `Trigger' on left controller stop craft.\n"
1388                 "        Pull `Trigger' on left controller for escape sequence, after stop.\n"
1389                 "        Pull `Trigger' on right controller to fire.\n"
1390                 "\n"
1391                 "For all other game function, use the virtual or real keyboard!\n"
1392                 ,HELP_ALPHA, 1, 2, 5, 0);
1393         help_views = 2;
1394 #endif
1395         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1396         if (!info_osd)
1397                 goto done;
1398
1399         /* init audio */
1400         sound_init(SOUND_SAMPLERATE, sound_irq);
1401
1402         /* start cpu */
1403         reset_cpu();
1404
1405         if (config_skip_intro)
1406                 skip_intro();
1407
1408         /* run game */
1409         main_loop();
1410
1411 done:
1412         exit_opengl();
1413 #ifdef HAVE_OVR
1414         exit_ovr();
1415 #endif
1416         exit_sdl();
1417
1418         if (chipreg)
1419                 free(chipreg);
1420         if (stop_event)
1421                 free(stop_event);
1422         if (memory)
1423                 free(memory);
1424         if (sound_buffer)
1425                 free(sound_buffer);
1426         if (image)
1427                 free(image);
1428         if (help_osd[0])
1429                 free(help_osd[0]);
1430         if (help_osd[1])
1431                 free(help_osd[1]);
1432         if (info_osd)
1433                 free(info_osd);
1434
1435         return 0;
1436 }
1437