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 0.3 /* move the stick until the craft moves */
  55
  56 static int config_ctrl_c = 0;
  57 static int config_amiga_speed = 0; /* fast speed */
  58 static double config_fps = 16.0;
  59 #if !defined(_WIN32)
  60 static const char *config_gamesave_dir = ".mercenary";
  61 #endif
  62 static int config_video_filter = 1;
  63 static int config_audio_filter = 1;
  64 static int config_render = 1; /* opengl render */
  65 static int config_skip_intro = 0;
  66 static int config_multisampling = 8;
  67 #ifdef HAVE_OVR
  68 static double config_benson_size = 0.5;
  69 static double config_fov = FOV_JOLLY;
  70 #else
  71 static double config_benson_size = 1.0;
  72 static double config_fov = FOV_NOVAGEN;
  73 #endif
  74 static double config_monitor_distance = 31.5; /* inch */
  75 #ifdef HAVE_OVR
  76 static double config_keyboard_distance = 28.5; /* inch */
  77 static double config_keyboard_height = 10.0; /* 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
  87 #define CPU_SPEED       7093790.0;
  88
  89 #define SOUND_SAMPLERATE 48000
  90 /* - game IRQ rate
  91  * - must be used for sound rendering chunk
  92  */
  93 #define IRQ_RATE        50
  94 /* numbe of buffer chunks to dejitter:
  95  * - SDL render interval
  96  * - sound rendering interval
  97  * - sound card interval
  98  * 4 should be minimum, if video rate is >=50 Hz
  99  */
 100 #define SOUND_CHUNKS    4
 101
 102 /* test sound to check if buffer does not overflow / underrun */
 103 //#define DEBUG_SOUND_BUFFERING
 104
 105 #define IOSIZE          0x1000 /* bytes in io space */
 106 #define MEMORY_SIZE     0x80000
 107 static uint8_t *memory = NULL;
 108 static uint8_t *stop_event = NULL;
 109 static uint8_t *image = NULL;
 110 static uint8_t *help_osd[2] = { NULL, NULL };
 111 static uint8_t *info_osd = NULL;
 112 static int help_view = 1;
 113 static int help_views = 1;
 114 static int32_t osd_timer = 0;
 115 #ifdef HAVE_OVR
 116 #define SCREEN_WIDTH    1344
 117 #define SCREEN_HEIGHT   800
 118 #else
 119 #define SCREEN_WIDTH    (320*3)
 120 #define SCREEN_HEIGHT   (200*3)
 121 #endif
 122 #define IMAGE_WIDTH     320
 123 #define IMAGE_HEIGHT    200
 124 #define BENSON_AT_LINE  136
 125 #define IMAGE_DIWSTART  0x2c
 126 #define HELP_ALPHA      0xd0
 127 #define OSD_WIDTH       320
 128 #define OSD_HEIGHT      16
 129 static uint16_t *chipreg = NULL;
 130 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 131 static int sound_buffer_size; /* buffer sample size */
 132 static int sound_buffer_writep; /* write pointer at buffer */
 133 static int sound_buffer_readp; /* read pointer at buffer */
 134 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 135 static double benson_size; /* render size of benson */
 136 static int render_legacy = 0; /* render original amiga screen, if set */
 137 static int render_improved = 0; /* render improved image, if set */
 138 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 139 static int intro_skipped = 0; /* indicated if we already have landed */
 140 static int window_width, window_height;
 141
 142 static const char *home_dir;
 143
 144 static int quit = 0;
 145
 146 int parse_args(int argc, char *argv[])
 147 {
 148         int i = 1;
 149
 150         while (argc > i) {
 151                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 152                         /*          |                                                                             | */
 153                         print_info("Usage: %s\n", argv[0]);
 154                         print_info(" -s --render-speed original | fast\n");
 155                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 156                         print_info("    --fps <fps>\n");
 157                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 158                         print_info(" -v --video-filter on | off\n");
 159                         print_info("        Set video filter.\n");
 160                         print_info(" -a --audio-filter on | off\n");
 161                         print_info("        Set audio filter.\n");
 162                         print_info(" -r --render original | opengl\n");
 163                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 164                         print_info(" -b --benson normal | half\n");
 165                         print_info("        Size of 'Benson' (control panel).\n");
 166                         print_info(" -m --multisampling <samples>\n");
 167                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 168                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 169                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 170                         print_info(" -i --skip-intro\n");
 171                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 172                         print_info("Improvement options:\n");
 173                         print_info("    --extend-roads 1 | 0\n");
 174                         print_info("        Roads in the distance end in a single point. This was ok for low\n");
 175                         print_info("        resolution, but for OpenGL we want equal width all the way.\n");
 176                         print_info("        This requires OpenGL rendering. (default = %d)\n", config_improve_extend_roads);
 177                         print_info("    --smooth-planets 1 | 0\n");
 178                         print_info("        Planet's rotation uses integer value, so they judder in the original\n");
 179                         print_info("        game rendering. This option requires OpenGL rendering. (default = %d)\n", config_improve_smooth_planets);
 180                         print_info("    --stars-rotation 1 | 0\n");
 181                         print_info("        Stars are rendered originally by using a fast routine. Use this option\n");
 182                         print_info("        to make them render on a sphere. They also rotate with the sky then.\n");
 183                         print_info("        This requires OpenGL rendering and is default with VR. (default = %d)\n", config_improve_stars_rotation);
 184                         print_info("    --fix-sky-rotation 1 | 0\n");
 185                         print_info("        Sky rotates in the wrong direction, if flying over planet. This is\n");
 186                         print_info("        fixed by rotating all sky object by 180 degrees. The original (wrong)\n");
 187                         print_info("        rotation is default, because it preserves the game's spirit!\n");
 188                         print_info("        This option requires OpenGL rendering. (default = %d)\n", config_improve_fix_sky_rotation);
 189                         print_info("Debug options:\n");
 190                         print_info(" -o --debug-opengl\n");
 191                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 192                         print_info("    --debug-transparent\n");
 193                         print_info("        Draw all things half transparent.\n");
 194                         print_info("    --ctrl-c\n");
 195                         print_info("        Use CTRL+C to exit game (used for development)\n");
 196                         return -1;
 197                 } else
 198                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 199                         i++;
 200                         if (argc == i) {
 201 missing_parameter:
 202                                 print_info("Missing parameter, use '--help'!\n");
 203                                 return -1;
 204                         }
 205                         if (!strcmp(argv[i], "original"))
 206                                 config_amiga_speed = 1;
 207                         else
 208                         if (!strcmp(argv[i], "fast"))
 209                                 config_amiga_speed = 0;
 210                         else {
 211 illegal_parameter:
 212                                 print_info("Illegal parameter, use '--help'!\n");
 213                                 return -1;
 214                         }
 215                 } else
 216                 if (!strcmp(argv[i], "--fps")) {
 217                         i++;
 218                         if (argc == i)
 219                                 goto missing_parameter;
 220                         config_fps = atof(argv[i]);
 221                         if (config_fov <= 0.0)
 222                                 goto illegal_parameter;
 223                 } else
 224                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 225                         i++;
 226                         if (argc == i)
 227                                 goto missing_parameter;
 228                         if (!strcmp(argv[i], "on"))
 229                                 config_video_filter = 1;
 230                         else
 231                         if (!strcmp(argv[i], "off"))
 232                                 config_video_filter = 0;
 233                         else
 234                                 goto illegal_parameter;
 235                 } else
 236                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 237                         i++;
 238                         if (argc == i)
 239                                 goto missing_parameter;
 240                         if (!strcmp(argv[i], "on"))
 241                                 config_audio_filter = 1;
 242                         else
 243                         if (!strcmp(argv[i], "off"))
 244                                 config_audio_filter = 0;
 245                         else
 246                                 goto illegal_parameter;
 247                 } else
 248                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 249                         i++;
 250                         if (argc == i)
 251                                 goto missing_parameter;
 252                         if (!strcmp(argv[i], "original"))
 253                                 config_render = 0;
 254                         else
 255                         if (!strcmp(argv[i], "opengl"))
 256                                 config_render = 1;
 257                         else
 258                                 goto illegal_parameter;
 259                 } else
 260                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 261                         i++;
 262                         if (argc == i)
 263                                 goto missing_parameter;
 264                         if (!strcmp(argv[i], "normal"))
 265                                 config_benson_size = 1.0;
 266                         else
 267                         if (!strcmp(argv[i], "half")) {
 268                                 config_benson_size = 0.5;
 269                                 if (config_fov == FOV_NOVAGEN)
 270                                         config_fov = FOV_JOLLY;
 271                         } else
 272                                 goto illegal_parameter;
 273                 } else
 274                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 275                         i++;
 276                         if (argc == i)
 277                                 goto missing_parameter;
 278                         config_multisampling = atoi(argv[i]);
 279                 } else
 280                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 281                         i++;
 282                         if (argc == i)
 283                                 goto missing_parameter;
 284                         config_fov = atof(argv[i]);
 285                         if (config_fov < 1.0 || config_fov > 179.0)
 286                                 goto illegal_parameter;
 287                 } else
 288                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 289                         config_skip_intro = 1;
 290                 } else
 291                 if (!strcmp(argv[i], "--extend-roads")) {
 292                         i++;
 293                         if (argc == i)
 294                                 goto missing_parameter;
 295                         config_improve_extend_roads = atoi(argv[i]);
 296                 } else
 297                 if (!strcmp(argv[i], "--smooth-planets")) {
 298                         i++;
 299                         if (argc == i)
 300                                 goto missing_parameter;
 301                         config_improve_smooth_planets = atoi(argv[i]);
 302                 } else
 303                 if (!strcmp(argv[i], "--stars-rotation")) {
 304                         i++;
 305                         if (argc == i)
 306                                 goto missing_parameter;
 307                         config_improve_stars_rotation = atoi(argv[i]);
 308                 } else
 309                 if (!strcmp(argv[i], "--fix-sky-rotation")) {
 310                         i++;
 311                         if (argc == i)
 312                                 goto missing_parameter;
 313                         config_improve_fix_sky_rotation = atoi(argv[i]);
 314                 } else
 315                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 316                         config_debug_opengl = 1;
 317                 } else
 318                 if (!strcmp(argv[i], "--debug-transparent")) {
 319                         config_debug_transparent = 1;
 320                 } else
 321                 if (!strcmp(argv[i], "--ctrl-c")) {
 322                         config_ctrl_c = 1;
 323                 } else {
 324                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 325                         return -1;
 326                 }
 327                 i++;
 328         }
 329
 330         return 0;
 331 }
 332
 333 static void osd_info(const char *param, const char *value)
 334 {
 335         char line[41] = "                                        ";
 336
 337         if (param[0]) {
 338                 strncpy(line + 21 - strlen(param), param, strlen(param));
 339                 line[22] = ':';
 340         }
 341         if (strlen(value) > 15) {
 342                 print_error("string too long\n");
 343                 return;
 344         }
 345         strncpy(line + 25, value, strlen(value));
 346         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 347         osd_timer = ticks_sdl() + 2500;
 348 }
 349
 350 static void resize_window(int width, int height)
 351 {
 352         window_width = width;
 353         window_height = height;
 354 }
 355
 356 #ifdef HAVE_OVR
 357 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_trigger_last = 0, button_left_thumb_last = 0, button_right_thumb_last = 0;
 358 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;
 359 static int thrust_last = KEYCODE_SPACE;
 360 static int keyboard_on = 0;
 361 static enum keycode vr_key_pressed = 0, vr_key = 0;
 362
 363 static void handle_vr_poses(void)
 364 {
 365         int button_a = 0, button_b = 0, button_x = 0, button_y = 0, button_menu = 0, button_trigger = 0, button_left_thumb = 0, button_right_thumb = 0;
 366         double hand_right_x = 0.0, hand_right_y = 0.0, hand_right_z = 0.0;
 367         double hand_right_yaw = 0.0, hand_right_pitch = 0.0, hand_right_roll = 0.0;
 368         double head_yaw = 0.0, head_pitch = 0.0, head_roll = 0.0;
 369         double stick_left_x = 0.0, stick_left_y = 0.0, stick_right_x = 0.0, stick_right_y = 0.0;
 370         int thrust = KEYCODE_SPACE;
 371
 372         get_poses_ovr(&button_a, &button_b, &button_x, &button_y, &button_menu, &button_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);
 373         if (button_menu && !button_menu_last) {
 374                 /* menu toggle */
 375                 if (help_view == help_views)
 376                         help_view = 0;
 377                 else
 378                         help_view++;
 379         }
 380         if (help_view) {
 381                 if (button_trigger && !button_trigger_last) {
 382                         /* rigger pressed */
 383                         normalize_observer_ovr();
 384                         osd_info("", "change height");
 385                 }
 386         } else {
 387                 /* handle input */
 388                 if (button_a && !button_a_last) {
 389                         /* keyboard A toggle */
 390                         if (keyboard_on == 1)
 391                                 keyboard_on = 0;
 392                         else
 393                                 keyboard_on = 1;
 394                 }
 395                 if (button_b && !button_b_last) {
 396                         /* keyboard B toggle */
 397                         if (keyboard_on == 2)
 398                                 keyboard_on = 0;
 399                         else
 400                                 keyboard_on = 2;
 401                 }
 402                 if (button_x && !button_x_last) {
 403                         /* 'board' pressed */
 404                         set_amiga_key(KEYCODE_b, 1);
 405                         set_amiga_key(KEYCODE_b, 0);
 406                 }
 407                 if (button_y && !button_y_last) {
 408                         /* 'leave' pressed */
 409                         set_amiga_key(KEYCODE_l, 1);
 410                         set_amiga_key(KEYCODE_l, 0);
 411                 }
 412                 if (button_left_thumb && !button_left_thumb_last) {
 413                         /* 'escape' pressed */
 414                         set_amiga_key(KEYCODE_ESCAPE, 1);
 415                         set_amiga_key(KEYCODE_ESCAPE, 0);
 416                 }
 417                 if (!button_left_thumb && button_left_thumb_last) {
 418                         /* 'escape' released */
 419                         set_amiga_key(KEYCODE_SPACE, 1);
 420                         set_amiga_key(KEYCODE_SPACE, 0);
 421                 }
 422                 if (button_right_thumb && !button_right_thumb_last) {
 423                         /* 'change orientation' pressed */
 424                         double roll, pitch, yaw;
 425                         mercenary_get_orientation(&roll, &pitch, &yaw);
 426                         mercenary_set_orientation(yaw + hand_right_yaw);
 427                 }
 428                 if (button_trigger && !button_trigger_last) {
 429                         /* trigger pressed */
 430                         if (!keyboard_on) {
 431                                 set_joystick(-1, -1, -1, -1, 1);
 432                         } else if (vr_key) {
 433                                 vr_key_pressed = vr_key;
 434                                 set_amiga_key(vr_key_pressed, 1);
 435                         }
 436                 }
 437                 if (!button_trigger && button_trigger_last) {
 438                         /* trigger released */
 439                         set_joystick(-1, -1, -1, -1, 0);
 440                         if (vr_key_pressed) {
 441                                 set_amiga_key(vr_key_pressed, 0);
 442                                 vr_key_pressed = 0;
 443                         }
 444                 }
 445                 /* joystick */
 446                 if (stick_right_x > STICK_ROTATE_THRESHOLD && !mercenary_get_info_walking())
 447                         set_joystick(0, 1, -1, -1, -1);
 448                 else
 449                 if (stick_right_x < -STICK_ROTATE_THRESHOLD && !mercenary_get_info_walking())
 450                         set_joystick(1, 0, -1, -1, -1);
 451                 else
 452                 if (stick_right_x_last > STICK_ROTATE_THRESHOLD || stick_right_x_last < -STICK_ROTATE_THRESHOLD)
 453                         set_joystick(0, 0, -1, -1, -1);
 454                 if (stick_right_y > STICK_WALK_THRESHOLD)
 455                         set_joystick(-1, -1, 1, 0, -1);
 456                 else
 457                 if (stick_right_y < -STICK_WALK_THRESHOLD)
 458                         set_joystick(-1, -1, 0, 1, -1);
 459                 else
 460                 if (stick_right_y_last > STICK_WALK_THRESHOLD || stick_right_y_last < -STICK_WALK_THRESHOLD)
 461                         set_joystick(-1, -1, 0, 0, -1);
 462                 /* thrust */
 463                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 464                         thrust = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD) * 10.5;
 465                 else
 466                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 467                         thrust = (stick_left_y - -STICK_THRUST_THRESHOLD) / (1.0 - -STICK_THRUST_THRESHOLD) * 10.5;
 468                 else
 469                         thrust = 0;
 470                 if (thrust >= 10)
 471                         thrust = KEYCODE_0;
 472                 else
 473                 if (thrust > 0)
 474                         thrust = KEYCODE_1 + thrust - 1;
 475                 else
 476                 if (thrust < 0)
 477                         thrust = KEYCODE_F1 - thrust - 1;
 478                 else
 479                 if (thrust <= -10)
 480                         thrust = KEYCODE_F10;
 481                 else
 482                         thrust = KEYCODE_SPACE;
 483                 if (thrust_last != thrust) {
 484                         set_amiga_key(thrust, 1);
 485                         set_amiga_key(thrust, 0);
 486                 }
 487         }
 488         button_a_last = button_a;
 489         button_b_last = button_b;
 490         button_x_last = button_x;
 491         button_y_last = button_y;
 492         button_menu_last = button_menu;
 493         button_trigger_last = button_trigger;
 494         button_left_thumb_last = button_left_thumb;
 495         button_right_thumb_last = button_right_thumb;
 496         stick_left_x_last = stick_left_x;
 497         stick_left_y_last = stick_left_y;
 498         stick_right_x_last = stick_right_x;
 499         stick_right_y_last = stick_right_y;
 500         thrust_last = thrust;
 501
 502         /* we must handle keyboard after toggeling keyboard_on,
 503          * so that keyboard_on will not change until keyboard is rendered */
 504         vr_key = 0;
 505         if (keyboard_on)
 506                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 507
 508         if (stick_right_y > STICK_WALK_THRESHOLD || stick_right_y < -STICK_WALK_THRESHOLD) {
 509                 double roll, pitch, yaw;
 510                 double dist, east, north;
 511                 int32_t move_east[4], move_north[4];
 512
 513                 mercenary_get_orientation(&roll, &pitch, &yaw);
 514                 /* we use a maximum move of 40 for all 4 steps (this is 10 for each step - equal to 'running') */
 515                 if (stick_right_y > 0.0)
 516                         dist = (stick_right_y - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 517                 else
 518                         dist = (stick_right_y + STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 519                 east = sin(hand_right_yaw + yaw + M_PI) * dist;
 520                 north = -cos(hand_right_yaw + yaw + M_PI) * dist;
 521                 /* calculatate the integer positions of 4 steps */
 522                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 523                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 524                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 525                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 526                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 527                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 528                 move_east[3] = (int32_t)(east + 0.5);
 529                 move_north[3] = (int32_t)(north + 0.5);
 530                 /* calculate the delta between each of the 4 step */
 531                 move_east[3] -= move_east[2];
 532                 move_north[3] -= move_north[2];
 533                 move_east[2] -= move_east[1];
 534                 move_north[2] -= move_north[1];
 535                 move_east[1] -= move_east[0];
 536                 move_north[1] -= move_north[0];
 537                 /* the game takes 4 steps to move the player */
 538                 mercenary_vr_move(1, move_east, move_north,
 539                         256,
 540                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 541         } else {
 542                 /* don't change what the game actually does when moving joystick in y-direction */
 543                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 544         }
 545 }
 546 #endif
 547
 548 static void skip_intro(void)
 549 {
 550         int event;
 551         double render_delay = 0.0;
 552         double cycle_count;
 553
 554         if (intro_skipped)
 555                 return;
 556
 557         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 558         do {
 559                 /* render, if not delayed */
 560                 if (render_delay <= 0.0) {
 561                         cycle_count = 0;
 562                         do {
 563                                 cycle_count += execute_cpu(0, &event);
 564                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 565                         render_delay += (double)cycle_count / CPU_SPEED;
 566                 }
 567                 /* VBL */
 568                 execute_cpu(3, NULL);
 569                 /* count down render delay */
 570                 if (render_delay) {
 571                         render_delay -= 1.0 / (double)IRQ_RATE;
 572                         if (render_delay < 0.0)
 573                                 render_delay = 0.0;
 574                 }
 575         } while (event != STOP_AT_CLEAR_SCREEN1);
 576
 577         intro_skipped = 1;
 578 }
 579
 580 static void special_event(int event)
 581 {
 582 #ifdef HAVE_OVR
 583         /* handle VR events */
 584         if (event == STOP_AT_PATCH_VR) {
 585                 mercenary_patch_vr();
 586                 return;
 587         }
 588 #endif
 589         /* handle events to improve rendering */
 590         if (render_improved)
 591                 render_capture_event(event);
 592 }
 593
 594 static void main_loop(void)
 595 {
 596         double frame_step, frame_time = 0.0, frame_render = 1;
 597         int had_first_irq = 0;
 598         static uint32_t current_time, last_time = 0, diff;
 599         int i, rc;
 600         int space, length;
 601         int cycle_count, event = STOP_AT_END;
 602         double render_delay = 0.0;
 603         uint32_t palette_address;
 604         uint16_t palette[16];
 605 #ifdef HAVE_OVR
 606         int eye;
 607 #endif
 608
 609         last_time = ticks_sdl();
 610
 611         /* render result on window */
 612         while (!quit) {
 613 #ifdef HAVE_OVR
 614                 /* get vr poses */
 615                 handle_vr_poses();
 616 #endif
 617                 /* if we are in interstellar fligt, we use 50 Hz */
 618                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 619                 /* else we use whatever frame rate the user wants */
 620                 if (render_capture_is_interstellar())
 621                         frame_step = vbl_duration * 50.0;
 622                 else if (!intro_skipped)
 623                         frame_step = vbl_duration * 10.0;
 624                 else
 625                         frame_step = vbl_duration * config_fps;
 626                 if (frame_step > 1.0)
 627                         frame_step = 1.0;
 628                 /* handle SDL events */
 629                 rc = event_sdl();
 630                 if (rc)
 631                         break;
 632
 633                 /* initialize rendering */
 634                 debug_opengl = config_debug_opengl;
 635                 benson_size = config_benson_size;
 636                 render_legacy = (!config_render) || debug_opengl;
 637                 render_improved = config_render || debug_opengl;
 638                 if (!render_improved) {
 639                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 640                         render_capture_reset();
 641                 }
 642                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 643                 /* amgia speed: don't render if we still delay */
 644                 /* non amiga speed: render if we need a new frame */
 645                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 646                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 647                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 648                 if (((frame_render && !config_amiga_speed)
 649                   || (config_amiga_speed && render_delay <= 0.0)
 650                   || event == STOP_AT_WAIT_INPUT)
 651                 && !(had_first_irq && help_view)) {
 652                         frame_render = 0;
 653                         /* start capturing for improved graphics */
 654                         if (render_improved)
 655                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_improve_stars_rotation, config_improve_fix_sky_rotation, config_debug_transparent);
 656
 657                         /* execute until the rendered image is ready (wait for VBL) */
 658                         cycle_count = 0;
 659                         do {
 660                                 cycle_count += execute_cpu(0, &event);
 661                                 /* handle special events */
 662                                 special_event(event);
 663                                 if (event == STOP_AT_CLEAR_SCREEN1)
 664                                         intro_skipped = 1;
 665                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 666                         /* stop capturing for improved graphics */
 667                         if (render_improved)
 668                                 render_capture_stop();
 669                         /* copy palette */
 670                         palette_address = mercenary_palette_view();
 671                         for (i = 0; i < 16; i++)
 672                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 673                         /* for amiga speed: set delay by the number of cycles */
 674                         if (config_amiga_speed)
 675                                 render_delay += (double)cycle_count / CPU_SPEED;
 676                 }
 677
 678                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 679 #ifdef HAVE_OVR
 680                 begin_render_ovr();
 681
 682                 for (eye = 0; eye < 2; eye++) {
 683                         double camera_x, camera_y, camera_z;
 684                         /* begin of rendering eye, viewport and frustum is set here */
 685                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 686 #else
 687                 {
 688 #endif
 689                         /* clear screen */
 690 #ifdef HAVE_OVR
 691                         opengl_clear(1);
 692 #else
 693                         opengl_clear(0);
 694 #endif
 695                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 696                         if (render_improved) {
 697 #ifndef HAVE_OVR
 698                                 /* viewport and frustum is set here */
 699                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 700 #endif
 701                                 /* render improved graphics, interpolate, if required,
 702                                  * if no item list is available, for legacy rendering
 703                                  */
 704 #ifdef HAVE_OVR
 705                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 706 #else
 707                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 708 #endif
 709                                 if (rc)
 710                                         goto goto_legacy;
 711 #ifdef HAVE_OVR
 712                                 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, 1);
 713 #else
 714                                 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, 0);
 715 #endif
 716                                 if (help_view)
 717 #ifdef HAVE_OVR
 718                                         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);
 719 #else
 720                                         opengl_blit_osd(0, help_osd[help_view - 1], config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 1.0, 1.0, 0.0, 0.0);
 721 #endif
 722                                 if (osd_timer) {
 723 #ifdef HAVE_OVR
 724                                         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);
 725 #else
 726                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 0.5, 0.04, 0.5, -0.95);
 727 #endif
 728                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 729                                                 osd_timer = 0;
 730                                 }
 731                         }
 732                         /* setup viewport for legacy image and render image, if enabled */
 733                         /* also render legacy, if render_improved failed due to not (yet) available items */
 734                         if (render_legacy) {
 735                                 goto_legacy:
 736                                 /* render game view without benson
 737                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 738                                  */
 739                                 if (had_first_irq)
 740                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 741 #ifndef HAVE_OVR
 742                                 /* viewport and frustum is set here */
 743                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 744 #endif
 745                                 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);
 746                                 if (help_view)
 747                                         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);
 748                                 if (osd_timer) {
 749                                         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);
 750                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 751                                                 osd_timer = 0;
 752                                 }
 753                         }
 754 #ifdef HAVE_OVR
 755                         /* render keyboard */
 756                         if (keyboard_on)
 757                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 758
 759                         /* end of rendering eye */
 760                         end_render_ovr_eye(eye);
 761                 }
 762                 /* at this point we are ready with our image, so we display */
 763                 end_render_ovr();
 764                 render_mirror_ovr(window_width, window_height);
 765 #else
 766                 }
 767 #endif
 768                 swap_sdl();
 769
 770                 /* advance frame time, if we are not in help view  */
 771                 if (!(had_first_irq && help_view)) {
 772                         frame_time += frame_step;
 773                         if (frame_time >= 1.0) {
 774                                 frame_time -= 1.0;
 775                                 frame_render = 1;
 776                         }
 777                 }
 778
 779                 /* measure frame rate */
 780                 framerate_measure();
 781
 782                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 783                 /* only do this, if we are not in help view */
 784                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 785                 if (!(had_first_irq && help_view)) {
 786                         current_time = ticks_sdl();
 787                         diff = current_time - last_time;
 788                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 789                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 790                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 791                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 792                         }
 793                         while (diff > 1000 / IRQ_RATE) {
 794                                 /* trigger and execute IRQ 3 = VBL */
 795                                 execute_cpu(3, NULL);
 796                                 had_first_irq = 1;
 797                                 /* transfer benson without game view
 798                                  * because we only got benson refreshed during VBL IRQ
 799                                  */
 800                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 801                                 /* render sound to sound buffer
 802                                  * buffer pointer read and write is atomic, so no locking required!
 803                                  */
 804                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 805                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 806 #ifdef DEBUG_SOUND_BUFFERING
 807                                         fprintf(stderr, "sound buffer overflow\n");
 808 #endif
 809                                         length = space;
 810                                 } else
 811                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 812 #ifdef DEBUG_SOUND_BUFFERING
 813                                 printf("can write %d, write %d\n", space, length);
 814                                 static int cnt = 0;
 815                                 int s;
 816                                 for (s = 0; s < length; s++) {
 817                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 818                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 819                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 820                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 821                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 822                                          cnt++;
 823                                 }
 824 #else
 825                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 826 #endif
 827                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 828                                 diff -= 1000 / IRQ_RATE;
 829                                 last_time += 1000 / IRQ_RATE;
 830
 831                                 /* count down render delay */
 832                                 if (render_delay) {
 833                                         render_delay -= 1.0 / (double)IRQ_RATE;
 834                                         if (render_delay < 0.0)
 835                                                 render_delay = 0.0;
 836                                 }
 837                         }
 838                 }
 839         }
 840 }
 841
 842 static uint16_t io_read(uint32_t address)
 843 {
 844         uint16_t value = 0xffff;
 845
 846         /* joystick and fire button */
 847         if (address == 0xbfe000 || address == 0xdff00c)
 848                 value &= emulate_joystick_read(address);
 849         /* keyboard */
 850         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 851                 value &= emulate_keyboard_read(address);
 852         /* diskette */
 853         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 854                 value &= emulate_disk_read(address);
 855
 856         return value;
 857 }
 858
 859 static void io_write(uint32_t address, uint16_t value)
 860 {
 861         /* dmacon and sound registers */
 862         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 863                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 864         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 865                 emulate_disk_write(address, value);
 866 }
 867
 868 /* two tracks with 0x1820 words of length */
 869 static uint8_t game_save[2][0x1820 << 1];
 870 static int last_track = 0;
 871
 872 /* game reads track with saved game */
 873 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 874 {
 875         if (length > sizeof(game_save[0])) {
 876                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 877                 return;
 878         }
 879
 880         /* if even track is selected, load game */
 881         if (!(track & 1)) {
 882                 char filename[256];
 883                 int gamesave_num = (track - 2) >> 1;
 884                 int got;
 885                 FILE *fp;
 886
 887                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 888 #if defined(_WIN32)
 889                 filename[0] = '\0';
 890 #else
 891                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 892                 mkdir(filename, 0777);
 893 #endif
 894                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 895                 fp = fopen(filename, "r");
 896                 if (!fp) {
 897 fail:
 898                         print_info("failed to load game from '%s'\n", filename);
 899                         goto copy;
 900                 }
 901                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 902                 fclose(fp);
 903                 if (got != 2)
 904                         goto fail;
 905         }
 906
 907 copy:
 908         /* copy track */
 909         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 910 }
 911
 912 /* game writes track with saved game */
 913 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 914 {
 915         /* skip sync info that is provided by game and only relevant for a real disk track */
 916         data += 0x200;
 917         length -= 0x200;
 918
 919         if (length != sizeof(game_save[0])) {
 920                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 921                 return;
 922         }
 923
 924         /* don't save if last track is the same, because disk is written on both sides with the same data */
 925         if (track == last_track) {
 926                 if (memcmp(memory + data, game_save[track & 1], length)) {
 927                         print_error("saving game data on other side of the disk is different, please fix!\n");
 928                 }
 929                 return;
 930         }
 931         last_track = track;
 932
 933         /* save game data */
 934         memcpy(game_save[track & 1], memory + data, length);
 935
 936         /* if done with saving */
 937         if ((track & 1)) {
 938                 char filename[256];
 939                 int gamesave_num = (track - 2) >> 1;
 940                 int wrote;
 941                 FILE *fp;
 942
 943 #if defined(_WIN32)
 944                 filename[0] = '\0';
 945 #else
 946                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 947                 mkdir(filename, 0777);
 948 #endif
 949                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 950                 fp = fopen(filename, "w");
 951                 if (!fp) {
 952 fail:
 953                         print_error("failed to save game to '%s'\n", filename);
 954                         return;
 955                 }
 956                 print_info("Game state saved to '%s'\n", filename);
 957                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 958                 fclose(fp);
 959                 if (wrote != 2)
 960                         goto fail;
 961         }
 962 }
 963
 964 static int shift = 0, ctrl = 0;
 965
 966 static void keyboard_sdl(int down, enum keycode keycode)
 967 {
 968         switch (keycode) {
 969         case KEYCODE_LCTRL:
 970         case KEYCODE_RCTRL:
 971                 ctrl = down;
 972                 break;
 973         default: break;
 974         }
 975
 976         if (ctrl && down) {
 977                 switch (keycode) {
 978                 case KEYCODE_h:
 979                         if (help_view == help_views)
 980                                 help_view = 0;
 981                         else
 982                                 help_view++;
 983                         break;
 984                 case KEYCODE_v:
 985                         config_video_filter ^= 1;
 986                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 987                         break;
 988                 case KEYCODE_a:
 989                         config_audio_filter ^= 1;
 990                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 991                         break;
 992                 case KEYCODE_s:
 993                         config_amiga_speed ^= 1;
 994                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 995                         break;
 996                 case KEYCODE_r:
 997                         config_render ^= 1;
 998                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 999                         break;
1000                 case KEYCODE_b:
1001                         if (!config_render && !config_debug_opengl) {
1002                                 osd_info("", "not applicable");
1003                                 break;
1004                         }
1005                         if (config_benson_size == 0.5) {
1006                                 config_benson_size = 1.0;
1007                                 config_fov = FOV_NOVAGEN;
1008                         } else {
1009                                 config_benson_size = 0.5;
1010                                 config_fov = FOV_JOLLY;
1011                         }
1012                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1013                         break;
1014                 case KEYCODE_i:
1015                         if (!intro_skipped)
1016                                 skip_intro();
1017                         else
1018                                 osd_info("", "not applicable");
1019                         break;
1020                 case KEYCODE_c:
1021                         if (config_ctrl_c)
1022                                 quit = 1;
1023                         break;
1024                 case KEYCODE_o:
1025 #ifdef HAVE_OVR
1026                         normalize_observer_ovr();
1027                         osd_info("", "change height");
1028 #else
1029                         osd_info("", "not applicable");
1030 #endif
1031                         break;
1032                 case KEYCODE_KP_PLUS:
1033 #ifdef HAVE_OVR
1034                         osd_info("", "not applicable");
1035 #else
1036                         if (config_fov / 1.2 >= FOV_MIN)
1037                                 config_fov /= 1.2;
1038                         disp_fov:
1039                         {
1040                                 char text[16];
1041                                 sprintf(text, "%.2f", config_fov);
1042                                 osd_info("FOV", text);
1043                         }
1044 #endif
1045                         break;
1046                 case KEYCODE_KP_MINUS:
1047 #ifdef HAVE_OVR
1048                         osd_info("", "not applicable");
1049 #else
1050                         if (config_fov * 1.2 <= FOV_MAX)
1051                                 config_fov *= 1.2;
1052                         goto disp_fov;
1053 #endif
1054                         break;
1055                 default: break;
1056                 }
1057                 /* do not pass keys to game while holding CTRL */
1058                 return;
1059         }
1060
1061         if (keycode == KEYCODE_PAUSE && down) {
1062                 if (help_view == help_views)
1063                         help_view = 0;
1064                 else
1065                         help_view++;
1066         }
1067
1068         /* in help view we must not forward keypresses */
1069         if (help_view)
1070                 return;
1071
1072         switch (keycode) {
1073         case KEYCODE_LSHIFT:
1074                 set_amiga_key(keycode, down);
1075                 shift = down;
1076                 break;
1077         case KEYCODE_RSHIFT:
1078                 set_amiga_key(keycode, down);
1079                 shift = down;
1080                 break;
1081         case KEYCODE_LEFT:
1082                 if (shift && down) {
1083                         set_amiga_key(keycode, down);
1084                         set_joystick(-1, -1, -1, -1, -1);
1085                         break;
1086                 }
1087                 set_amiga_key(keycode, 0);
1088                 set_joystick(down, -1, -1, -1, -1);
1089                 break;
1090         case KEYCODE_RIGHT:
1091                 if (shift && down) {
1092                         set_amiga_key(keycode, down);
1093                         set_joystick(-1, -1, -1, -1, -1);
1094                         break;
1095                 }
1096                 set_amiga_key(keycode, 0);
1097                 set_joystick(-1, down, -1, -1, -1);
1098                 break;
1099         case KEYCODE_UP:
1100                 if (shift && down) {
1101                         set_amiga_key(keycode, down);
1102                         set_joystick(-1, -1, -1, -1, -1);
1103                         break;
1104                 }
1105                 set_amiga_key(keycode, 0);
1106                 set_joystick(-1, -1, down, -1, -1);
1107                 break;
1108         case KEYCODE_DOWN:
1109                 if (shift && down) {
1110                         set_amiga_key(keycode, down);
1111                         set_joystick(-1, -1, -1, -1, -1);
1112                         break;
1113                 }
1114                 set_amiga_key(keycode, 0);
1115                 set_joystick(-1, -1, -1, down, -1);
1116                 break;
1117         case KEYCODE_END:
1118                 set_joystick(-1, -1, -1, -1, down);
1119                 break;
1120         case KEYCODE_INSERT:
1121                 set_amiga_key(KEYCODE_HELP, down);
1122                 break;
1123         default:
1124                 set_amiga_key(keycode, down);
1125         }
1126 }
1127
1128 void audio_sdl(float *data, int length)
1129 {
1130         int fill, s;
1131
1132         /* read sound from sound buffer
1133          * buffer pointer read and write is atomic, so no locking required!
1134          */
1135         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1136         if (fill < length) {
1137 #ifdef DEBUG_SOUND_BUFFERING
1138                 fprintf(stderr, "sound buffer underrun\n");
1139 #endif
1140                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1141                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1142         }
1143         for (s = 0; s < length; s++) {
1144                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1145                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1146         }
1147 #ifdef DEBUG_SOUND_BUFFERING
1148         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1149 #endif
1150         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1151 }
1152
1153 void sound_irq(void)
1154 {
1155         /* trigger and execute IRQ 4 = sound */
1156         execute_cpu(4, NULL);
1157 }
1158
1159 int main(int argc, char *argv[])
1160 {
1161         int rc;
1162         int sdl_sound_chunk;
1163
1164         home_dir = getenv("HOME");
1165         if (!home_dir)
1166                 home_dir = "";
1167
1168         rc = parse_args(argc, argv);
1169         if (rc)
1170                 return 0;
1171
1172         /* allocate image */
1173         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1174         if (!image) {
1175                 print_error("Failed to allocate image buffer\n");
1176                 goto done;
1177         }
1178
1179         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1180                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1181                 goto done;
1182         }
1183         if ((1000 % IRQ_RATE)) {
1184                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1185                 goto done;
1186         }
1187
1188         /* calculate SDL chunk size for audio
1189          * it must be a power of two, but not more than the chunk size for each IRQ!
1190          */
1191         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1192                 ;
1193         sdl_sound_chunk >>= 1;
1194 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1195
1196         /* allocate sound buffers */
1197         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1198         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1199         if (!sound_buffer) {
1200                 print_error("Failed to allocate image buffer\n");
1201                 goto done;
1202         }
1203
1204         /* allocate memory */
1205         memory = calloc(MEMORY_SIZE, 1);
1206         if (!memory) {
1207                 print_error("Failed to allocate cpu's memory\n");
1208                 goto done;
1209         }
1210         stop_event = calloc(MEMORY_SIZE, 1);
1211         if (!stop_event) {
1212                 print_error("Failed to allocate cpu's stop_event memory\n");
1213                 goto done;
1214         }
1215         chipreg = calloc(IOSIZE, 1);
1216         if (!chipreg) {
1217                 print_error("Failed to allocate chip register\n");
1218                 goto done;
1219         }
1220
1221         /* init cpu code */
1222         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1223
1224         /* init disk emulation */
1225         disk_init(disk_read, disk_write);
1226
1227         /* load binary */
1228         mercenary_load();
1229
1230         /* patch some stuff */
1231         mercenary_patch();
1232
1233         /* init SDL and OpenGL */
1234 #ifdef HAVE_OVR
1235         int vbl_sync = 0;
1236         int rift = 1;
1237         int multisampling = 0;
1238         window_width = SCREEN_WIDTH;
1239         window_height = SCREEN_HEIGHT;
1240 #else
1241         int vbl_sync = 1;
1242         int rift = 0;
1243         int multisampling = config_multisampling;
1244         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1245         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1246 #endif
1247         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1248         if (rc < 0)
1249                 goto done;
1250 #ifdef HAVE_OVR
1251         rc = init_ovr(config_multisampling);
1252         if (rc < 0)
1253                 goto done;
1254         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1255         if (rc < 0)
1256                 goto done;
1257 #endif
1258         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1259         if (rc < 0)
1260                 goto done;
1261
1262         /* init osd */
1263         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1264         if (rc < 0)
1265                 goto done;
1266         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1267         if (rc < 0)
1268                 goto done;
1269         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1270         if (!help_osd[0])
1271                 goto done;
1272         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);
1273         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1274                 "Emulation:\n"
1275                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1276                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1277                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1278                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1279                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1280                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1281                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1282                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1283                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1284 #ifdef HAVE_OVR
1285                 "        Press `CTRL' + `O' (or right trigger) to reset observer position.\n"
1286 #endif
1287                 "\n"
1288                 "Answer to a Question:\n"
1289                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1290                 "\n"
1291                 "Walking / Driving / Flying:\n"
1292                 "        Use cursor keys as joystick, to move player / craft.\n"
1293                 "        Press `R' for running, 'W' for walking speed.\n"
1294                 "        Press `B' to board, `L' to leave.\n"
1295                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1296                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1297                 "        Press `SPACE' to stop craft.\n"
1298                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1299                 "        Press `T' for turbo on certain craft.\n"
1300                 "        Press `END' as joystick's fire button.\n"
1301                 "\n"
1302                 "Elevator:\n"
1303                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1304                 "\n"
1305                 "Inside a transporter:\n"
1306                 "        Press `1'...`0' to select destination.\n"
1307                 "\n"
1308                 "Items:\n"
1309                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1310                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1311                 "        Press `NUMPAD Enter' to select certain items.\n"
1312                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1313                 "        Press `NUMPAD *' to read entry\n"
1314                 "Saving / Loading / Pause:\n"
1315                 "        Press `INSERT' to loading and saving options.\n"
1316                 "        Press `ENTER' to pause game, other key to continue.\n"
1317                 ,HELP_ALPHA, 1, 2, 5, 0);
1318 #ifdef HAVE_OVR
1319         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1320         if (!help_osd[1])
1321                 goto done;
1322         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);
1323         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1324                 "Emulation using Controller:\n"
1325                 "        Press `Enter' button to toggle this help screen on or off.\n"
1326                 "        Press `A' button to emulate keyboard to control game.\n"
1327                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1328                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1329                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1330                 "        Press `Trigger' on right controller enter the highlighted key.\n"
1331                 "\n"
1332                 "Walking / Driving / Flying using Controller:\n"
1333                 "        Use thumb stick on right controller, to move player / craft.\n"
1334                 "        Point right controller towards the direction to walk to.\n"
1335                 "        Press thumb stick to change orientation to that direction.\n"
1336                 "        Press `X' button to board, `Y' button to leave.\n"
1337                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1338                 "        Press and hold thumb stick on left controller for escape sequence.\n"
1339                 "        Release thumb stick on left controller stop craft.\n"
1340                 "        Press `Trigger' on right controller to fire.\n"
1341                 "\n"
1342                 "For all other game function, use the emulated keyboards!\n"
1343                 ,HELP_ALPHA, 1, 2, 5, 0);
1344         help_views = 2;
1345 #endif
1346         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1347         if (!info_osd)
1348                 goto done;
1349
1350         /* init audio */
1351         sound_init(SOUND_SAMPLERATE, sound_irq);
1352
1353         /* start cpu */
1354         reset_cpu();
1355
1356         if (config_skip_intro)
1357                 skip_intro();
1358
1359         /* run game */
1360         main_loop();
1361
1362 done:
1363         exit_opengl();
1364 #ifdef HAVE_OVR
1365         exit_ovr();
1366 #endif
1367         exit_sdl();
1368
1369         if (chipreg)
1370                 free(chipreg);
1371         if (stop_event)
1372                 free(stop_event);
1373         if (memory)
1374                 free(memory);
1375         if (sound_buffer)
1376                 free(sound_buffer);
1377         if (image)
1378                 free(image);
1379         if (help_osd[0])
1380                 free(help_osd[0]);
1381         if (help_osd[1])
1382                 free(help_osd[1]);
1383         if (info_osd)
1384                 free(info_osd);
1385
1386         return 0;
1387 }
1388