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[3] = { NULL, NULL, NULL };
 112 static uint8_t *info_osd = NULL;
 113 static int help_view = 1;
 114 static int help_views = 0;
 115 static int32_t osd_timer = 0;
 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 toggle_help(void)
 363 {
 364         if (help_view == 0)
 365                 help_view = 2;
 366         else
 367         if (help_view == help_views)
 368                 help_view = 0;
 369         else
 370                 help_view++;
 371 }
 372
 373 static void resize_window(int width, int height)
 374 {
 375         window_width = width;
 376         window_height = height;
 377 }
 378
 379 #ifdef HAVE_OVR
 380 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;
 381 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;
 382 static int thrust_last = 0;
 383 static int joystick_set_x_last = 0, joystick_set_y_last = 0;
 384 static int keyboard_on = 0;
 385 static enum keycode vr_key_pressed = 0, vr_key = 0;
 386
 387 static void handle_vr_poses(void)
 388 {
 389         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;
 390         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 391         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 392         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 393         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 394         int thrust = thrust_last;
 395         int joystick_set_x = 0, joystick_set_y = 0;
 396         static uint32_t current_time, last_time = 0, diff;
 397         static double increment, inc_count = 0.0;
 398
 399         /* handle input */
 400         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);
 401         if (button_menu && !button_menu_last) {
 402                 /* menu toggle */
 403                 toggle_help();
 404         }
 405         if (button_left_thumb) {
 406                 /* reset observer */
 407                 reset_observer_ovr();
 408                 osd_info("", "reset observer");
 409         }
 410         if (!help_view) {
 411                 if (button_x && !button_x_last) {
 412                         /* 'board' pressed */
 413                         set_amiga_key(KEYCODE_b, 1);
 414                         set_amiga_key(KEYCODE_b, 0);
 415                         /* important: get rid of old state */
 416                         thrust = 0;
 417                 }
 418                 if (button_y && !button_y_last) {
 419                         /* 'leave' pressed */
 420                         set_amiga_key(KEYCODE_l, 1);
 421                         set_amiga_key(KEYCODE_l, 0);
 422                 }
 423                 if (button_right_trigger && !button_right_trigger_last) {
 424                         /* trigger pressed */
 425                         if (keyboard_on) {
 426                                 if (vr_key) {
 427                                         vr_key_pressed = vr_key;
 428                                         set_amiga_key(vr_key_pressed, 1);
 429                                 }
 430                         } else
 431                         if (mercenary_get_info_walking()) {
 432                                 /* change orientation */
 433                                 double roll, pitch, yaw;
 434                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 435                                 mercenary_set_orientation(yaw + hand_right_yaw);
 436                         } else {
 437                                 /* fire button */
 438                                 set_joystick(-1, -1, -1, -1, 1);
 439                         }
 440                 }
 441                 if (!button_right_trigger && button_right_trigger_last) {
 442                         /* trigger released */
 443                         set_joystick(-1, -1, -1, -1, 0);
 444                         if (vr_key_pressed) {
 445                                 set_amiga_key(vr_key_pressed, 0);
 446                                 vr_key_pressed = 0;
 447                         }
 448                 }
 449                 /* joystick */
 450                 /* reset moving state, so the game is not influenced before we want to */
 451                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 452                 joystick_set_x = 0;
 453                 joystick_set_y = 0;
 454                 if (!mercenary_get_info_walking()) {
 455                         /* turn right and left when not walking */
 456                         if (stick_right_x > STICK_ROTATE_THRESHOLD) {
 457                                 set_joystick(0, 1, -1, -1, -1);
 458                                 joystick_set_x = 1;
 459                         } else
 460                         if (stick_right_x < -STICK_ROTATE_THRESHOLD) {
 461                                 set_joystick(1, 0, -1, -1, -1);
 462                                 joystick_set_x = 1;
 463                         }
 464                         /* pitch craft */
 465                         if (stick_right_y > STICK_WALK_THRESHOLD) {
 466                                 set_joystick(-1, -1, 1, 0, -1);
 467                                 joystick_set_y = 1;
 468                         } else
 469                         if (stick_right_y < -STICK_WALK_THRESHOLD) {
 470                                 set_joystick(-1, -1, 0, 1, -1);
 471                                 joystick_set_y = 1;
 472                         }
 473                         if (joystick_set_x || joystick_set_y) {
 474                                 mercenary_vr_move(0, NULL, NULL,
 475                                         256,
 476                                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 477                         }
 478                 } else {
 479                         double roll, pitch, yaw;
 480                         double dist, dir, east, north;
 481                         int32_t move_east[4], move_north[4];
 482
 483                         /* check if we push the stick */
 484                         dist = sqrt(stick_right_x * stick_right_x + stick_right_y * stick_right_y);
 485                         if (dist > STICK_WALK_THRESHOLD) {
 486                                 /* get stick amplitude (dist) and direction (dir) */
 487                                 if (dist > 1.0)
 488                                         dist = 1.0;
 489                                 dist = (dist - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 490                                 dir = atan2(stick_right_x, stick_right_y);
 491                                 /* use hand direction to get actual stick direction */
 492                                 dir = fmod(dir - hand_right_yaw, M_PI * 2.0);
 493                                 if (dir < -M_PI)
 494                                         dir += M_PI * 2.0;
 495                                 if (dir > M_PI)
 496                                         dir -= M_PI * 2.0;
 497                                 /* flip directin, if we walk backwards */
 498                                 if (dir > M_PI / 2.0 || dir < -M_PI / 2.0) {
 499                                         /* go backwards */
 500                                         set_joystick(-1, -1, 0, 1, -1);
 501                                         joystick_set_y = 1;
 502                                 } else {
 503                                         /* go forward */
 504                                         set_joystick(-1, -1, 1, 0, -1);
 505                                         joystick_set_y = 1;
 506                                 }
 507                                 joystick_set_y = 1;
 508                                 mercenary_get_orientation(&roll, &pitch, &yaw);
 509                                 east = sin(yaw - dir + M_PI) * dist;
 510                                 north = -cos(yaw - dir + M_PI) * dist;
 511                                 /* calculatate the integer positions of 4 steps */
 512                                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 513                                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 514                                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 515                                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 516                                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 517                                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 518                                 move_east[3] = (int32_t)(east + 0.5);
 519                                 move_north[3] = (int32_t)(north + 0.5);
 520                                 /* calculate the delta between each of the 4 step */
 521                                 move_east[3] -= move_east[2];
 522                                 move_north[3] -= move_north[2];
 523                                 move_east[2] -= move_east[1];
 524                                 move_north[2] -= move_north[1];
 525                                 move_east[1] -= move_east[0];
 526                                 move_north[1] -= move_north[0];
 527                                 /* the game takes 4 steps to move the player */
 528                                 mercenary_vr_move(1, move_east, move_north, 256, 256);
 529                         }
 530                 }
 531                 if (joystick_set_x_last && !joystick_set_x)
 532                         set_joystick(0, 0, -1, -1, -1);
 533                 if (joystick_set_y_last && !joystick_set_y)
 534                         set_joystick(-1, -1, 0, 0, -1);
 535                 /* thrust */
 536                 /* button to toggle between stop and escape */
 537                 if (button_left_trigger && !button_left_trigger_last) {
 538                         /* 'escape' pressed */
 539                         if (thrust_last == 0)
 540                                 thrust = -99;
 541                         else
 542                                 thrust = 0;
 543                 }
 544                 /* get stick to increment or decrement thrust */
 545                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 546                         increment = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 547                 else
 548                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 549                         increment = (stick_left_y + STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD);
 550                 else
 551                         increment = 0;
 552                 current_time = ticks_sdl();
 553                 if (increment) {
 554                         diff = current_time - last_time;
 555                         inc_count += increment * diff;
 556                         if (inc_count > 150.0 && thrust >= -10 && thrust < 10) {
 557                                 thrust++;
 558                                 inc_count = 0.0;
 559                         }
 560                         if (inc_count < -150.0 && thrust <= 10 && thrust > -10) {
 561                                 thrust--;
 562                                 inc_count = 0.0;
 563                         }
 564                 } else {
 565                         inc_count = 0;
 566                 }
 567                 last_time = current_time;
 568                 /* send thrust change as keycodes */
 569                 if (thrust_last != thrust) {
 570                         if (thrust >= 10) {
 571                                 set_amiga_key(KEYCODE_0, 1);
 572                                 set_amiga_key(KEYCODE_0, 0);
 573                         } else
 574                         if (thrust <= -10 && thrust > -99) {
 575                                 set_amiga_key(KEYCODE_F10, 1);
 576                                 set_amiga_key(KEYCODE_F10, 0);
 577                         } else
 578                         if (thrust <= -99) {
 579                                 set_amiga_key(KEYCODE_ESCAPE, 1);
 580                                 set_amiga_key(KEYCODE_ESCAPE, 0);
 581                         } else
 582                         if (thrust > 0) {
 583                                 set_amiga_key(KEYCODE_1 + thrust - 1, 1);
 584                                 set_amiga_key(KEYCODE_1 + thrust - 1, 0);
 585                         } else
 586                         if (thrust < 0) {
 587                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 1);
 588                                 set_amiga_key(KEYCODE_F1 - thrust - 1, 0);
 589                         } else {
 590                                 set_amiga_key(KEYCODE_SPACE, 1);
 591                                 set_amiga_key(KEYCODE_SPACE, 0);
 592                         }
 593                 }
 594         }
 595         button_a_last = button_a;
 596         button_b_last = button_b;
 597         button_x_last = button_x;
 598         button_y_last = button_y;
 599         button_menu_last = button_menu;
 600         button_left_trigger_last = button_left_trigger;
 601         button_right_trigger_last = button_right_trigger;
 602         button_left_thumb_last = button_left_thumb;
 603         button_right_thumb_last = button_right_thumb;
 604         stick_left_x_last = stick_left_x;
 605         stick_left_y_last = stick_left_y;
 606         stick_right_x_last = stick_right_x;
 607         stick_right_y_last = stick_right_y;
 608         thrust_last = thrust;
 609         joystick_set_x_last = joystick_set_x;
 610         joystick_set_y_last = joystick_set_y;
 611
 612         /* we must handle keyboard after toggeling keyboard_on,
 613          * so that keyboard_on will not change until keyboard is rendered */
 614         vr_key = 0;
 615         keyboard_on = handle_vr_keyboard(hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 616 }
 617 #endif
 618
 619 static void skip_intro(void)
 620 {
 621         int event;
 622         double render_delay = 0.0;
 623         double cycle_count;
 624
 625         if (intro_skipped)
 626                 return;
 627
 628         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 629         do {
 630                 /* render, if not delayed */
 631                 if (render_delay <= 0.0) {
 632                         cycle_count = 0;
 633                         do {
 634                                 cycle_count += execute_cpu(0, &event);
 635                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 636                         render_delay += (double)cycle_count / CPU_SPEED;
 637                 }
 638                 /* VBL */
 639                 execute_cpu(3, NULL);
 640                 /* count down render delay */
 641                 if (render_delay) {
 642                         render_delay -= 1.0 / (double)IRQ_RATE;
 643                         if (render_delay < 0.0)
 644                                 render_delay = 0.0;
 645                 }
 646         } while (event != STOP_AT_CLEAR_SCREEN1);
 647
 648         intro_skipped = 1;
 649 }
 650
 651 static void special_event(int event)
 652 {
 653 #ifdef HAVE_OVR
 654         /* handle VR events */
 655         if (event == STOP_AT_PATCH_VR) {
 656                 mercenary_patch_vr();
 657                 return;
 658         }
 659 #endif
 660         /* handle events to improve rendering */
 661         if (render_improved)
 662                 render_capture_event(event);
 663 }
 664
 665 static void main_loop(void)
 666 {
 667         double frame_step, frame_time = 0.0, frame_render = 1;
 668         int had_first_irq = 0;
 669         static uint32_t current_time, last_time = 0, diff;
 670         int i, rc;
 671         int space, length;
 672         int cycle_count, event = STOP_AT_END;
 673         double render_delay = 0.0;
 674         uint32_t palette_address;
 675         uint16_t palette[16];
 676         int all_white = 0;
 677 #ifdef HAVE_OVR
 678         int eye;
 679         int vr = 1;
 680 #else
 681         int vr = 0;
 682 #endif
 683
 684         last_time = ticks_sdl();
 685
 686         /* render result on window */
 687         while (!quit) {
 688 #ifdef HAVE_OVR
 689                 /* get vr poses */
 690                 handle_vr_poses();
 691 #endif
 692                 /* if we are in interstellar fligt, we use 50 Hz */
 693                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 694                 /* else we use whatever frame rate the user wants */
 695                 if (render_capture_is_interstellar())
 696                         frame_step = vbl_duration * 50.0;
 697                 else if (!intro_skipped)
 698                         frame_step = vbl_duration * 10.0;
 699                 else
 700                         frame_step = vbl_duration * config_fps;
 701                 if (frame_step > 1.0)
 702                         frame_step = 1.0;
 703                 /* handle SDL events */
 704                 rc = event_sdl();
 705                 if (rc)
 706                         break;
 707
 708                 /* initialize rendering */
 709                 debug_opengl = config_debug_opengl;
 710                 benson_size = config_benson_size;
 711                 render_legacy = (!config_render) || debug_opengl;
 712                 render_improved = config_render || debug_opengl;
 713                 if (!render_improved) {
 714                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 715                         render_capture_reset();
 716                 }
 717                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 718                 /* amgia speed: don't render if we still delay */
 719                 /* non amiga speed: render if we need a new frame */
 720                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 721                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 722                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 723                 if (((frame_render && !config_amiga_speed)
 724                   || (config_amiga_speed && render_delay <= 0.0)
 725                   || event == STOP_AT_WAIT_INPUT)
 726                 && !(had_first_irq && help_view)) {
 727                         frame_render = 0;
 728                         /* start capturing for improved graphics */
 729                         if (render_improved)
 730                                 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);
 731
 732                         /* execute until the rendered image is ready (wait for VBL) */
 733                         cycle_count = 0;
 734                         do {
 735                                 cycle_count += execute_cpu(0, &event);
 736                                 /* handle special events */
 737                                 special_event(event);
 738                                 if (event == STOP_AT_CLEAR_SCREEN1)
 739                                         intro_skipped = 1;
 740                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 741                         /* stop capturing for improved graphics */
 742                         if (render_improved)
 743                                 render_capture_stop();
 744                         /* copy palette */
 745                         palette_address = mercenary_palette_view();
 746                         for (i = 0; i < 16; i++)
 747                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 748                         /* for amiga speed: set delay by the number of cycles */
 749                         if (config_amiga_speed)
 750                                 render_delay += (double)cycle_count / CPU_SPEED;
 751                 }
 752
 753                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 754 #ifdef HAVE_OVR
 755                 begin_render_ovr();
 756
 757                 for (eye = 0; eye < 2; eye++) {
 758                         double camera_x, camera_y, camera_z;
 759                         /* begin of rendering eye, viewport and frustum is set here */
 760                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 761 #else
 762                 {
 763 #endif
 764                         /* clear screen */
 765                         opengl_clear(vr);
 766                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 767                         if (render_improved) {
 768 #ifndef HAVE_OVR
 769                                 /* viewport and frustum is set here */
 770                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 771 #endif
 772                                 /* render improved graphics, interpolate, if required,
 773                                  * if no item list is available, for legacy rendering
 774                                  */
 775                                 if (all_white)
 776                                         rc = render_all_white(vr);
 777                                 else
 778                                         rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, vr);
 779                                 if (rc)
 780                                         goto goto_legacy;
 781                                 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);
 782                                 if (help_view)
 783                                         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);
 784                                 if (osd_timer) {
 785                                         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);
 786                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 787                                                 osd_timer = 0;
 788                                 }
 789                         }
 790                         /* setup viewport for legacy image and render image, if enabled */
 791                         /* also render legacy, if render_improved failed due to not (yet) available items */
 792                         if (render_legacy) {
 793                                 goto_legacy:
 794                                 /* render game view without benson
 795                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 796                                  */
 797                                 if (had_first_irq)
 798                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 799 #ifndef HAVE_OVR
 800                                 /* viewport and frustum is set here */
 801                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 802 #endif
 803                                 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);
 804                                 if (help_view)
 805                                         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);
 806                                 if (osd_timer) {
 807                                         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);
 808                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 809                                                 osd_timer = 0;
 810                                 }
 811                         }
 812 #ifdef HAVE_OVR
 813                         /* render keyboard */
 814                         if (keyboard_on)
 815                                 render_vr_keyboard(camera_x, camera_y);
 816
 817                         /* end of rendering eye */
 818                         end_render_ovr_eye(eye);
 819                 }
 820                 /* at this point we are ready with our image, so we display */
 821                 end_render_ovr();
 822                 render_mirror_ovr(window_width, window_height);
 823 #else
 824                 }
 825 #endif
 826                 swap_sdl();
 827
 828                 /* advance frame time, if we are not in help view  */
 829                 if (!(had_first_irq && help_view)) {
 830                         frame_time += frame_step;
 831                         if (frame_time >= 1.0) {
 832                                 frame_time -= 1.0;
 833                                 frame_render = 1;
 834                         }
 835                 }
 836
 837                 /* measure frame rate */
 838                 framerate_measure();
 839
 840                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 841                 /* only do this, if we are not in help view */
 842                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 843                 if (!(had_first_irq && help_view)) {
 844                         current_time = ticks_sdl();
 845                         diff = current_time - last_time;
 846                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 847                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 848                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 849                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 850                         }
 851                         while (diff > 1000 / IRQ_RATE) {
 852                                 /* trigger and execute IRQ 3 = VBL */
 853                                 execute_cpu(3, NULL);
 854                                 had_first_irq = 1;
 855                                 /* transfer benson without game view
 856                                  * because we only got benson refreshed during VBL IRQ
 857                                  */
 858                                 all_white = emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 859                                 /* render sound to sound buffer
 860                                  * buffer pointer read and write is atomic, so no locking required!
 861                                  */
 862                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 863                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 864 #ifdef DEBUG_SOUND_BUFFERING
 865                                         fprintf(stderr, "sound buffer overflow\n");
 866 #endif
 867                                         length = space;
 868                                 } else
 869                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 870 #ifdef DEBUG_SOUND_BUFFERING
 871                                 printf("can write %d, write %d\n", space, length);
 872                                 static int cnt = 0;
 873                                 int s;
 874                                 for (s = 0; s < length; s++) {
 875                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 876                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 877                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 878                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 879                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 880                                          cnt++;
 881                                 }
 882 #else
 883                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 884 #endif
 885                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 886                                 diff -= 1000 / IRQ_RATE;
 887                                 last_time += 1000 / IRQ_RATE;
 888
 889                                 /* count down render delay */
 890                                 if (render_delay) {
 891                                         render_delay -= 1.0 / (double)IRQ_RATE;
 892                                         if (render_delay < 0.0)
 893                                                 render_delay = 0.0;
 894                                 }
 895                         }
 896                 }
 897         }
 898 }
 899
 900 static uint16_t io_read(uint32_t address)
 901 {
 902         uint16_t value = 0xffff;
 903
 904         /* joystick and fire button */
 905         if (address == 0xbfe000 || address == 0xdff00c)
 906                 value &= emulate_joystick_read(address);
 907         /* keyboard */
 908         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 909                 value &= emulate_keyboard_read(address);
 910         /* diskette */
 911         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 912                 value &= emulate_disk_read(address);
 913
 914         return value;
 915 }
 916
 917 static void io_write(uint32_t address, uint16_t value)
 918 {
 919         /* dmacon and sound registers */
 920         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 921                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 922         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 923                 emulate_disk_write(address, value);
 924 }
 925
 926 /* two tracks with 0x1820 words of length */
 927 static uint8_t game_save[2][0x1820 << 1];
 928 static int last_track = 0;
 929
 930 /* game reads track with saved game */
 931 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 932 {
 933         if (length > sizeof(game_save[0])) {
 934                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 935                 return;
 936         }
 937
 938         /* if even track is selected, load game */
 939         if (!(track & 1)) {
 940                 char filename[256];
 941                 int gamesave_num = (track - 2) >> 1;
 942                 int got;
 943                 FILE *fp;
 944
 945                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 946 #if defined(_WIN32)
 947                 filename[0] = '\0';
 948 #else
 949                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 950                 mkdir(filename, 0777);
 951 #endif
 952                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 953                 fp = fopen(filename, "r");
 954                 if (!fp) {
 955 fail:
 956                         print_info("failed to load game from '%s'\n", filename);
 957                         goto copy;
 958                 }
 959                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 960                 fclose(fp);
 961                 if (got != 2)
 962                         goto fail;
 963         }
 964
 965 copy:
 966         /* copy track */
 967         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 968 }
 969
 970 /* game writes track with saved game */
 971 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 972 {
 973         /* skip sync info that is provided by game and only relevant for a real disk track */
 974         data += 0x200;
 975         length -= 0x200;
 976
 977         if (length != sizeof(game_save[0])) {
 978                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 979                 return;
 980         }
 981
 982         /* don't save if last track is the same, because disk is written on both sides with the same data */
 983         if (track == last_track) {
 984                 if (memcmp(memory + data, game_save[track & 1], length)) {
 985                         print_error("saving game data on other side of the disk is different, please fix!\n");
 986                 }
 987                 return;
 988         }
 989         last_track = track;
 990
 991         /* save game data */
 992         memcpy(game_save[track & 1], memory + data, length);
 993
 994         /* if done with saving */
 995         if ((track & 1)) {
 996                 char filename[256];
 997                 int gamesave_num = (track - 2) >> 1;
 998                 int wrote;
 999                 FILE *fp;
1000
1001 #if defined(_WIN32)
1002                 filename[0] = '\0';
1003 #else
1004                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
1005                 mkdir(filename, 0777);
1006 #endif
1007                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
1008                 fp = fopen(filename, "w");
1009                 if (!fp) {
1010 fail:
1011                         print_error("failed to save game to '%s'\n", filename);
1012                         return;
1013                 }
1014                 print_info("Game state saved to '%s'\n", filename);
1015                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
1016                 fclose(fp);
1017                 if (wrote != 2)
1018                         goto fail;
1019         }
1020 }
1021
1022 static int shift = 0, ctrl = 0;
1023
1024 static void keyboard_sdl(int down, enum keycode keycode)
1025 {
1026         switch (keycode) {
1027         case KEYCODE_LCTRL:
1028         case KEYCODE_RCTRL:
1029                 ctrl = down;
1030                 break;
1031         default: break;
1032         }
1033
1034         if (ctrl && down) {
1035                 switch (keycode) {
1036                 case KEYCODE_h:
1037                         toggle_help();
1038                         break;
1039                 case KEYCODE_v:
1040                         config_video_filter ^= 1;
1041                         osd_info("video filter", (config_video_filter) ? "on" : "off");
1042                         break;
1043                 case KEYCODE_a:
1044                         config_audio_filter ^= 1;
1045                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
1046                         break;
1047                 case KEYCODE_s:
1048                         config_amiga_speed ^= 1;
1049                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
1050                         break;
1051                 case KEYCODE_r:
1052                         config_render ^= 1;
1053                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
1054                         break;
1055                 case KEYCODE_b:
1056                         if (!config_render && !config_debug_opengl) {
1057                                 osd_info("", "not applicable");
1058                                 break;
1059                         }
1060                         if (config_benson_size == 0.5) {
1061                                 config_benson_size = 1.0;
1062                                 config_fov = FOV_NOVAGEN;
1063                         } else {
1064                                 config_benson_size = 0.5;
1065                                 config_fov = FOV_JOLLY;
1066                         }
1067                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1068                         break;
1069                 case KEYCODE_i:
1070                         if (!intro_skipped)
1071                                 skip_intro();
1072                         else
1073                                 osd_info("", "not applicable");
1074                         break;
1075                 case KEYCODE_c:
1076                         if (config_ctrl_c)
1077                                 quit = 1;
1078                         break;
1079                 case KEYCODE_o:
1080 #ifdef HAVE_OVR
1081                         reset_observer_ovr();
1082                         osd_info("", "reset observer");
1083 #else
1084                         osd_info("", "not applicable");
1085 #endif
1086                         break;
1087                 case KEYCODE_KP_PLUS:
1088 #ifdef HAVE_OVR
1089                         osd_info("", "not applicable");
1090 #else
1091                         if (config_fov / 1.2 >= FOV_MIN)
1092                                 config_fov /= 1.2;
1093                         disp_fov:
1094                         {
1095                                 char text[16];
1096                                 sprintf(text, "%.2f", config_fov);
1097                                 osd_info("FOV", text);
1098                         }
1099 #endif
1100                         break;
1101                 case KEYCODE_KP_MINUS:
1102 #ifdef HAVE_OVR
1103                         osd_info("", "not applicable");
1104 #else
1105                         if (config_fov * 1.2 <= FOV_MAX)
1106                                 config_fov *= 1.2;
1107                         goto disp_fov;
1108 #endif
1109                         break;
1110                 default: break;
1111                 }
1112                 /* do not pass keys to game while holding CTRL */
1113                 return;
1114         }
1115
1116         if (help_view == 1 && down) {
1117                 help_view = 2;
1118                 return;
1119         }
1120
1121         if (keycode == KEYCODE_PAUSE && down) {
1122                 toggle_help();
1123                 return;
1124         }
1125
1126         /* in help view we must not forward keypresses */
1127         if (help_view)
1128                 return;
1129
1130         switch (keycode) {
1131         case KEYCODE_LSHIFT:
1132                 set_amiga_key(keycode, down);
1133                 shift = down;
1134                 break;
1135         case KEYCODE_RSHIFT:
1136                 set_amiga_key(keycode, down);
1137                 shift = down;
1138                 break;
1139         case KEYCODE_LEFT:
1140                 if (shift && down) {
1141                         set_amiga_key(keycode, down);
1142                         set_joystick(-1, -1, -1, -1, -1);
1143                         break;
1144                 }
1145                 set_amiga_key(keycode, 0);
1146                 set_joystick(down, -1, -1, -1, -1);
1147                 break;
1148         case KEYCODE_RIGHT:
1149                 if (shift && down) {
1150                         set_amiga_key(keycode, down);
1151                         set_joystick(-1, -1, -1, -1, -1);
1152                         break;
1153                 }
1154                 set_amiga_key(keycode, 0);
1155                 set_joystick(-1, down, -1, -1, -1);
1156                 break;
1157         case KEYCODE_UP:
1158                 if (shift && down) {
1159                         set_amiga_key(keycode, down);
1160                         set_joystick(-1, -1, -1, -1, -1);
1161                         break;
1162                 }
1163                 set_amiga_key(keycode, 0);
1164                 set_joystick(-1, -1, down, -1, -1);
1165                 break;
1166         case KEYCODE_DOWN:
1167                 if (shift && down) {
1168                         set_amiga_key(keycode, down);
1169                         set_joystick(-1, -1, -1, -1, -1);
1170                         break;
1171                 }
1172                 set_amiga_key(keycode, 0);
1173                 set_joystick(-1, -1, -1, down, -1);
1174                 break;
1175         case KEYCODE_END:
1176                 set_joystick(-1, -1, -1, -1, down);
1177                 break;
1178         case KEYCODE_INSERT:
1179                 set_amiga_key(KEYCODE_HELP, down);
1180                 break;
1181         default:
1182                 set_amiga_key(keycode, down);
1183         }
1184 }
1185
1186 void audio_sdl(float *data, int length)
1187 {
1188         int fill, s;
1189
1190         /* read sound from sound buffer
1191          * buffer pointer read and write is atomic, so no locking required!
1192          */
1193         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1194         if (fill < length) {
1195 #ifdef DEBUG_SOUND_BUFFERING
1196                 fprintf(stderr, "sound buffer underrun\n");
1197 #endif
1198                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1199                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1200         }
1201         for (s = 0; s < length; s++) {
1202                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1203                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1204         }
1205 #ifdef DEBUG_SOUND_BUFFERING
1206         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1207 #endif
1208         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1209 }
1210
1211 void sound_irq(void)
1212 {
1213         /* trigger and execute IRQ 4 = sound */
1214         execute_cpu(4, NULL);
1215 }
1216
1217 extern uint8_t mercenary_splash_palette[][3];
1218 extern char mercenary_splash_pixels[];
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, 0x00);
1331         if (!help_osd[0])
1332                 goto done;
1333         text_insert_image(help_osd[0], mercenary_splash_palette, mercenary_splash_pixels, 0xff);
1334         help_views++;
1335         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1336         if (!help_osd[1])
1337                 goto done;
1338         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);
1339         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1340                 "Emulation:\n"
1341                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1342                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1343                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1344                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1345                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1346                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1347                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1348                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1349                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1350 #ifdef HAVE_OVR
1351                 "        Press `CTRL' + `O' (or both triggers) to reset observer position.\n"
1352 #endif
1353                 "\n"
1354                 "Answer to a Question:\n"
1355                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1356                 "\n"
1357                 "Walking / Driving / Flying:\n"
1358                 "        Use cursor keys as joystick, to move player / craft.\n"
1359                 "        Press `R' for running, 'W' for walking speed.\n"
1360                 "        Press `B' to board, `L' to leave.\n"
1361                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1362                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1363                 "        Press `SPACE' to stop craft.\n"
1364                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1365                 "        Press `T' for turbo on certain craft.\n"
1366                 "        Press `END' as joystick's fire button.\n"
1367                 "\n"
1368                 "Elevator:\n"
1369                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1370                 "\n"
1371                 "Inside a transporter:\n"
1372                 "        Press `1'...`0' to select destination.\n"
1373                 "\n"
1374                 "Items:\n"
1375                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1376                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1377                 "        Press `NUMPAD Enter' to select certain items.\n"
1378                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1379                 "        Press `NUMPAD *' to read entry\n"
1380                 "Saving / Loading / Pause:\n"
1381                 "        Press `INSERT' to loading and saving options.\n"
1382                 "        Press `ENTER' to pause game, other key to continue.\n"
1383                 ,HELP_ALPHA, 1, 2, 5, 0);
1384                 help_views++;
1385 #ifdef HAVE_OVR
1386         help_osd[2] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1387         if (!help_osd[2])
1388                 goto done;
1389         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1390         text_render(help_osd[2], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1391                 "Emulation using Controller:\n"
1392                 "        Press `Enter' button to toggle this help screen on or off.\n"
1393                 "        To have a virtual keyboard, point below benson (control pannel).\n"
1394                 "        Point to a key on keyboard. The key will highlight.\n"
1395                 "        Pull `Trigger' on right controller to enter the highlighted key.\n"
1396                 "        Press thumb stick on left controller to reset observer position.\n"
1397                 "\n"
1398                 "Walking / Driving / Flying using Controller:\n"
1399                 "        Use thumb stick on right controller, to move player / craft.\n"
1400                 "        Point right controller towards the direction to walk to.\n"
1401                 "        Pull `Trigger' on right controller to change orientation.\n"
1402                 "        Press `X' button to board, `Y' button to leave.\n"
1403                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1404                 "        Pull `Trigger' on left controller stop craft.\n"
1405                 "        Pull `Trigger' on left controller for escape sequence, after stop.\n"
1406                 "        Pull `Trigger' on right controller to fire.\n"
1407                 "\n"
1408                 "For all other game function, use the virtual or real keyboard!\n"
1409                 ,HELP_ALPHA, 1, 2, 5, 0);
1410                 help_views++;
1411 #endif
1412         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1413         if (!info_osd)
1414                 goto done;
1415
1416         /* init audio */
1417         sound_init(SOUND_SAMPLERATE, sound_irq);
1418
1419         /* start cpu */
1420         reset_cpu();
1421
1422         if (config_skip_intro)
1423                 skip_intro();
1424
1425         /* run game */
1426         main_loop();
1427
1428 done:
1429         exit_opengl();
1430 #ifdef HAVE_OVR
1431         exit_ovr();
1432 #endif
1433         exit_sdl();
1434
1435         if (chipreg)
1436                 free(chipreg);
1437         if (stop_event)
1438                 free(stop_event);
1439         if (memory)
1440                 free(memory);
1441         if (sound_buffer)
1442                 free(sound_buffer);
1443         if (image)
1444                 free(image);
1445         while (help_views) {
1446                 help_views--;
1447                 if (help_osd[help_views])
1448                         free(help_osd[help_views]);
1449         }
1450         if (info_osd)
1451                 free(info_osd);
1452
1453         return 0;
1454 }
1455