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_trigger && !button_trigger_last) {
 423                         /* trigger pressed */
 424                         if (!keyboard_on) {
 425                                 set_joystick(-1, -1, -1, -1, 1);
 426                         } else if (vr_key) {
 427                                 vr_key_pressed = vr_key;
 428                                 set_amiga_key(vr_key_pressed, 1);
 429                         }
 430                 }
 431                 if (!button_trigger && button_trigger_last) {
 432                         /* trigger released */
 433                         set_joystick(-1, -1, -1, -1, 0);
 434                         if (vr_key_pressed) {
 435                                 set_amiga_key(vr_key_pressed, 0);
 436                                 vr_key_pressed = 0;
 437                         }
 438                 }
 439                 /* joystick */
 440                 if (stick_right_x > STICK_ROTATE_THRESHOLD)
 441                         set_joystick(0, 1, -1, -1, -1);
 442                 else
 443                 if (stick_right_x < -STICK_ROTATE_THRESHOLD)
 444                         set_joystick(1, 0, -1, -1, -1);
 445                 else
 446                 if (stick_right_x_last > STICK_ROTATE_THRESHOLD || stick_right_x_last < -STICK_ROTATE_THRESHOLD)
 447                         set_joystick(0, 0, -1, -1, -1);
 448                 if (stick_right_y > STICK_WALK_THRESHOLD)
 449                         set_joystick(-1, -1, 1, 0, -1);
 450                 else
 451                 if (stick_right_y < -STICK_WALK_THRESHOLD)
 452                         set_joystick(-1, -1, 0, 1, -1);
 453                 else
 454                 if (stick_right_y_last > STICK_WALK_THRESHOLD || stick_right_y_last < -STICK_WALK_THRESHOLD)
 455                         set_joystick(-1, -1, 0, 0, -1);
 456                 /* thrust */
 457                 if (stick_left_y > STICK_THRUST_THRESHOLD)
 458                         thrust = (stick_left_y - STICK_THRUST_THRESHOLD) / (1.0 - STICK_THRUST_THRESHOLD) * 10.5;
 459                 else
 460                 if (stick_left_y < -STICK_THRUST_THRESHOLD)
 461                         thrust = (stick_left_y - -STICK_THRUST_THRESHOLD) / (1.0 - -STICK_THRUST_THRESHOLD) * 10.5;
 462                 else
 463                         thrust = 0;
 464                 if (thrust >= 10)
 465                         thrust = KEYCODE_0;
 466                 else
 467                 if (thrust > 0)
 468                         thrust = KEYCODE_1 + thrust - 1;
 469                 else
 470                 if (thrust < 0)
 471                         thrust = KEYCODE_F1 - thrust - 1;
 472                 else
 473                 if (thrust <= -10)
 474                         thrust = KEYCODE_F10;
 475                 else
 476                         thrust = KEYCODE_SPACE;
 477                 if (thrust_last != thrust) {
 478                         set_amiga_key(thrust, 1);
 479                         set_amiga_key(thrust, 0);
 480                 }
 481         }
 482         button_a_last = button_a;
 483         button_b_last = button_b;
 484         button_x_last = button_x;
 485         button_y_last = button_y;
 486         button_menu_last = button_menu;
 487         button_trigger_last = button_trigger;
 488         button_left_thumb_last = button_left_thumb;
 489         button_right_thumb_last = button_right_thumb;
 490         stick_left_x_last = stick_left_x;
 491         stick_left_y_last = stick_left_y;
 492         stick_right_x_last = stick_right_x;
 493         stick_right_y_last = stick_right_y;
 494         thrust_last = thrust;
 495
 496         /* we must handle keyboard after toggeling keyboard_on,
 497          * so that keyboard_on will not change until keyboard is rendered */
 498         vr_key = 0;
 499         if (keyboard_on)
 500                 handle_vr_keyboard(keyboard_on - 1, hand_right_x, hand_right_y, hand_right_z, hand_right_yaw, hand_right_pitch, &vr_key);
 501
 502         if (stick_right_y > STICK_WALK_THRESHOLD || stick_right_y < -STICK_WALK_THRESHOLD) {
 503                 double roll, pitch, yaw;
 504                 double dist, east, north;
 505                 int32_t move_east[4], move_north[4];
 506
 507                 mercenary_get_orientation(&roll, &pitch, &yaw);
 508                 /* we use a maximum move of 40 for all 4 steps (this is 10 for each step - equal to 'running') */
 509                 if (stick_right_y > 0.0)
 510                         dist = (stick_right_y - STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 511                 else
 512                         dist = (stick_right_y + STICK_WALK_THRESHOLD) / (1.0 - STICK_WALK_THRESHOLD) * 40.0;
 513                 east = sin(hand_right_yaw + yaw + M_PI) * dist;
 514                 north = -cos(hand_right_yaw + yaw + M_PI) * dist;
 515                 /* calculatate the integer positions of 4 steps */
 516                 move_east[0] = (int32_t)((east * 0.25) + 0.5);
 517                 move_north[0] = (int32_t)((north * 0.25) + 0.5);
 518                 move_east[1] = (int32_t)((east * 0.5) + 0.5);
 519                 move_north[1] = (int32_t)((north * 0.5) + 0.5);
 520                 move_east[2] = (int32_t)((east * 0.75) + 0.5);
 521                 move_north[2] = (int32_t)((north * 0.75) + 0.5);
 522                 move_east[3] = (int32_t)(east + 0.5);
 523                 move_north[3] = (int32_t)(north + 0.5);
 524                 /* calculate the delta between each of the 4 step */
 525                 move_east[3] -= move_east[2];
 526                 move_north[3] -= move_north[2];
 527                 move_east[2] -= move_east[1];
 528                 move_north[2] -= move_north[1];
 529                 move_east[1] -= move_east[0];
 530                 move_north[1] -= move_north[0];
 531                 /* the game takes 4 steps to move the player */
 532                 mercenary_vr_move(1, move_east, move_north,
 533                         256,
 534                         (int)(256.0 * fabs(stick_right_y) - STICK_WALK_THRESHOLD / (1.0 - STICK_WALK_THRESHOLD) + 0.5));
 535         } else {
 536                 /* don't change what the game actually does when moving joystick in y-direction */
 537                 mercenary_vr_move(0, NULL, NULL, 256, 256);
 538         }
 539 }
 540 #endif
 541
 542 static void skip_intro(void)
 543 {
 544         int event;
 545         double render_delay = 0.0;
 546         double cycle_count;
 547
 548         if (intro_skipped)
 549                 return;
 550
 551         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 552         do {
 553                 /* render, if not delayed */
 554                 if (render_delay <= 0.0) {
 555                         cycle_count = 0;
 556                         do {
 557                                 cycle_count += execute_cpu(0, &event);
 558                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 559                         render_delay += (double)cycle_count / CPU_SPEED;
 560                 }
 561                 /* VBL */
 562                 execute_cpu(3, NULL);
 563                 /* count down render delay */
 564                 if (render_delay) {
 565                         render_delay -= 1.0 / (double)IRQ_RATE;
 566                         if (render_delay < 0.0)
 567                                 render_delay = 0.0;
 568                 }
 569         } while (event != STOP_AT_CLEAR_SCREEN1);
 570
 571         intro_skipped = 1;
 572 }
 573
 574 static void special_event(int event)
 575 {
 576 #ifdef HAVE_OVR
 577         /* handle VR events */
 578         if (event == STOP_AT_PATCH_VR) {
 579                 mercenary_patch_vr();
 580                 return;
 581         }
 582 #endif
 583         /* handle events to improve rendering */
 584         if (render_improved)
 585                 render_capture_event(event);
 586 }
 587
 588 static void main_loop(void)
 589 {
 590         double frame_step, frame_time = 0.0, frame_render = 1;
 591         int had_first_irq = 0;
 592         static uint32_t current_time, last_time = 0, diff;
 593         int i, rc;
 594         int space, length;
 595         int cycle_count, event = STOP_AT_END;
 596         double render_delay = 0.0;
 597         uint32_t palette_address;
 598         uint16_t palette[16];
 599 #ifdef HAVE_OVR
 600         int eye;
 601 #endif
 602
 603         last_time = ticks_sdl();
 604
 605         /* render result on window */
 606         while (!quit) {
 607 #ifdef HAVE_OVR
 608                 /* get vr poses */
 609                 handle_vr_poses();
 610 #endif
 611                 /* if we are in interstellar fligt, we use 50 Hz */
 612                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 613                 /* else we use whatever frame rate the user wants */
 614                 if (render_capture_is_interstellar())
 615                         frame_step = vbl_duration * 50.0;
 616                 else if (!intro_skipped)
 617                         frame_step = vbl_duration * 10.0;
 618                 else
 619                         frame_step = vbl_duration * config_fps;
 620                 if (frame_step > 1.0)
 621                         frame_step = 1.0;
 622                 /* handle SDL events */
 623                 rc = event_sdl();
 624                 if (rc)
 625                         break;
 626
 627                 /* initialize rendering */
 628                 debug_opengl = config_debug_opengl;
 629                 benson_size = config_benson_size;
 630                 render_legacy = (!config_render) || debug_opengl;
 631                 render_improved = config_render || debug_opengl;
 632                 if (!render_improved) {
 633                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 634                         render_capture_reset();
 635                 }
 636                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 637                 /* amgia speed: don't render if we still delay */
 638                 /* non amiga speed: render if we need a new frame */
 639                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 640                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 641                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 642                 if (((frame_render && !config_amiga_speed)
 643                   || (config_amiga_speed && render_delay <= 0.0)
 644                   || event == STOP_AT_WAIT_INPUT)
 645                 && !(had_first_irq && help_view)) {
 646                         frame_render = 0;
 647                         /* start capturing for improved graphics */
 648                         if (render_improved)
 649                                 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);
 650
 651                         /* execute until the rendered image is ready (wait for VBL) */
 652                         cycle_count = 0;
 653                         do {
 654                                 cycle_count += execute_cpu(0, &event);
 655                                 /* handle special events */
 656                                 special_event(event);
 657                                 if (event == STOP_AT_CLEAR_SCREEN1)
 658                                         intro_skipped = 1;
 659                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 660                         /* stop capturing for improved graphics */
 661                         if (render_improved)
 662                                 render_capture_stop();
 663                         /* copy palette */
 664                         palette_address = mercenary_palette_view();
 665                         for (i = 0; i < 16; i++)
 666                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 667                         /* for amiga speed: set delay by the number of cycles */
 668                         if (config_amiga_speed)
 669                                 render_delay += (double)cycle_count / CPU_SPEED;
 670                 }
 671
 672                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 673 #ifdef HAVE_OVR
 674                 begin_render_ovr();
 675
 676                 for (eye = 0; eye < 2; eye++) {
 677                         double camera_x, camera_y, camera_z;
 678                         /* begin of rendering eye, viewport and frustum is set here */
 679                         begin_render_ovr_eye(eye, &camera_x, &camera_y, &camera_z);
 680 #else
 681                 {
 682 #endif
 683                         /* clear screen */
 684 #ifdef HAVE_OVR
 685                         opengl_clear(1);
 686 #else
 687                         opengl_clear(0);
 688 #endif
 689                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 690                         if (render_improved) {
 691 #ifndef HAVE_OVR
 692                                 /* viewport and frustum is set here */
 693                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 694 #endif
 695                                 /* render improved graphics, interpolate, if required,
 696                                  * if no item list is available, for legacy rendering
 697                                  */
 698 #ifdef HAVE_OVR
 699                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 700 #else
 701                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 702 #endif
 703                                 if (rc)
 704                                         goto goto_legacy;
 705 #ifdef HAVE_OVR
 706                                 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);
 707 #else
 708                                 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);
 709 #endif
 710                                 if (help_view)
 711 #ifdef HAVE_OVR
 712                                         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);
 713 #else
 714                                         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);
 715 #endif
 716                                 if (osd_timer) {
 717 #ifdef HAVE_OVR
 718                                         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);
 719 #else
 720                                         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);
 721 #endif
 722                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 723                                                 osd_timer = 0;
 724                                 }
 725                         }
 726                         /* setup viewport for legacy image and render image, if enabled */
 727                         /* also render legacy, if render_improved failed due to not (yet) available items */
 728                         if (render_legacy) {
 729                                 goto_legacy:
 730                                 /* render game view without benson
 731                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 732                                  */
 733                                 if (had_first_irq)
 734                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 735 #ifndef HAVE_OVR
 736                                 /* viewport and frustum is set here */
 737                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, FOV_NOVAGEN, 1.0);
 738 #endif
 739                                 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);
 740                                 if (help_view)
 741                                         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);
 742                                 if (osd_timer) {
 743                                         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);
 744                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 745                                                 osd_timer = 0;
 746                                 }
 747                         }
 748 #ifdef HAVE_OVR
 749                         /* render keyboard */
 750                         if (keyboard_on)
 751                                 render_vr_keyboard(keyboard_on - 1, camera_x, camera_y);
 752
 753                         /* end of rendering eye */
 754                         end_render_ovr_eye(eye);
 755                 }
 756                 /* at this point we are ready with our image, so we display */
 757                 end_render_ovr();
 758                 render_mirror_ovr(window_width, window_height);
 759 #else
 760                 }
 761 #endif
 762                 swap_sdl();
 763
 764                 /* advance frame time, if we are not in help view  */
 765                 if (!(had_first_irq && help_view)) {
 766                         frame_time += frame_step;
 767                         if (frame_time >= 1.0) {
 768                                 frame_time -= 1.0;
 769                                 frame_render = 1;
 770                         }
 771                 }
 772
 773                 /* measure frame rate */
 774                 framerate_measure();
 775
 776                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 777                 /* only do this, if we are not in help view */
 778                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 779                 if (!(had_first_irq && help_view)) {
 780                         current_time = ticks_sdl();
 781                         diff = current_time - last_time;
 782                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 783                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 784                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 785                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 786                         }
 787                         while (diff > 1000 / IRQ_RATE) {
 788                                 /* trigger and execute IRQ 3 = VBL */
 789                                 execute_cpu(3, NULL);
 790                                 had_first_irq = 1;
 791                                 /* transfer benson without game view
 792                                  * because we only got benson refreshed during VBL IRQ
 793                                  */
 794                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 795                                 /* render sound to sound buffer
 796                                  * buffer pointer read and write is atomic, so no locking required!
 797                                  */
 798                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 799                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 800 #ifdef DEBUG_SOUND_BUFFERING
 801                                         fprintf(stderr, "sound buffer overflow\n");
 802 #endif
 803                                         length = space;
 804                                 } else
 805                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 806 #ifdef DEBUG_SOUND_BUFFERING
 807                                 printf("can write %d, write %d\n", space, length);
 808                                 static int cnt = 0;
 809                                 int s;
 810                                 for (s = 0; s < length; s++) {
 811                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 812                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 813                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 814                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 815                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 816                                          cnt++;
 817                                 }
 818 #else
 819                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 820 #endif
 821                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 822                                 diff -= 1000 / IRQ_RATE;
 823                                 last_time += 1000 / IRQ_RATE;
 824
 825                                 /* count down render delay */
 826                                 if (render_delay) {
 827                                         render_delay -= 1.0 / (double)IRQ_RATE;
 828                                         if (render_delay < 0.0)
 829                                                 render_delay = 0.0;
 830                                 }
 831                         }
 832                 }
 833         }
 834 }
 835
 836 static uint16_t io_read(uint32_t address)
 837 {
 838         uint16_t value = 0xffff;
 839
 840         /* joystick and fire button */
 841         if (address == 0xbfe000 || address == 0xdff00c)
 842                 value &= emulate_joystick_read(address);
 843         /* keyboard */
 844         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 845                 value &= emulate_keyboard_read(address);
 846         /* diskette */
 847         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 848                 value &= emulate_disk_read(address);
 849
 850         return value;
 851 }
 852
 853 static void io_write(uint32_t address, uint16_t value)
 854 {
 855         /* dmacon and sound registers */
 856         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 857                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 858         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 859                 emulate_disk_write(address, value);
 860 }
 861
 862 /* two tracks with 0x1820 words of length */
 863 static uint8_t game_save[2][0x1820 << 1];
 864 static int last_track = 0;
 865
 866 /* game reads track with saved game */
 867 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 868 {
 869         if (length > sizeof(game_save[0])) {
 870                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 871                 return;
 872         }
 873
 874         /* if even track is selected, load game */
 875         if (!(track & 1)) {
 876                 char filename[256];
 877                 int gamesave_num = (track - 2) >> 1;
 878                 int got;
 879                 FILE *fp;
 880
 881                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 882 #if defined(_WIN32)
 883                 filename[0] = '\0';
 884 #else
 885                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 886                 mkdir(filename, 0777);
 887 #endif
 888                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 889                 fp = fopen(filename, "r");
 890                 if (!fp) {
 891 fail:
 892                         print_info("failed to load game from '%s'\n", filename);
 893                         goto copy;
 894                 }
 895                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 896                 fclose(fp);
 897                 if (got != 2)
 898                         goto fail;
 899         }
 900
 901 copy:
 902         /* copy track */
 903         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 904 }
 905
 906 /* game writes track with saved game */
 907 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 908 {
 909         /* skip sync info that is provided by game and only relevant for a real disk track */
 910         data += 0x200;
 911         length -= 0x200;
 912
 913         if (length != sizeof(game_save[0])) {
 914                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 915                 return;
 916         }
 917
 918         /* don't save if last track is the same, because disk is written on both sides with the same data */
 919         if (track == last_track) {
 920                 if (memcmp(memory + data, game_save[track & 1], length)) {
 921                         print_error("saving game data on other side of the disk is different, please fix!\n");
 922                 }
 923                 return;
 924         }
 925         last_track = track;
 926
 927         /* save game data */
 928         memcpy(game_save[track & 1], memory + data, length);
 929
 930         /* if done with saving */
 931         if ((track & 1)) {
 932                 char filename[256];
 933                 int gamesave_num = (track - 2) >> 1;
 934                 int wrote;
 935                 FILE *fp;
 936
 937 #if defined(_WIN32)
 938                 filename[0] = '\0';
 939 #else
 940                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 941                 mkdir(filename, 0777);
 942 #endif
 943                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 944                 fp = fopen(filename, "w");
 945                 if (!fp) {
 946 fail:
 947                         print_error("failed to save game to '%s'\n", filename);
 948                         return;
 949                 }
 950                 print_info("Game state saved to '%s'\n", filename);
 951                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 952                 fclose(fp);
 953                 if (wrote != 2)
 954                         goto fail;
 955         }
 956 }
 957
 958 static int shift = 0, ctrl = 0;
 959
 960 static void keyboard_sdl(int down, enum keycode keycode)
 961 {
 962         switch (keycode) {
 963         case KEYCODE_LCTRL:
 964         case KEYCODE_RCTRL:
 965                 ctrl = down;
 966                 break;
 967         default: break;
 968         }
 969
 970         if (ctrl && down) {
 971                 switch (keycode) {
 972                 case KEYCODE_h:
 973                         if (help_view == help_views)
 974                                 help_view = 0;
 975                         else
 976                                 help_view++;
 977                         break;
 978                 case KEYCODE_v:
 979                         config_video_filter ^= 1;
 980                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 981                         break;
 982                 case KEYCODE_a:
 983                         config_audio_filter ^= 1;
 984                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 985                         break;
 986                 case KEYCODE_s:
 987                         config_amiga_speed ^= 1;
 988                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 989                         break;
 990                 case KEYCODE_r:
 991                         config_render ^= 1;
 992                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 993                         break;
 994                 case KEYCODE_b:
 995                         if (!config_render && !config_debug_opengl) {
 996                                 osd_info("", "not applicable");
 997                                 break;
 998                         }
 999                         if (config_benson_size == 0.5) {
1000                                 config_benson_size = 1.0;
1001                                 config_fov = FOV_NOVAGEN;
1002                         } else {
1003                                 config_benson_size = 0.5;
1004                                 config_fov = FOV_JOLLY;
1005                         }
1006                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
1007                         break;
1008                 case KEYCODE_i:
1009                         if (!intro_skipped)
1010                                 skip_intro();
1011                         else
1012                                 osd_info("", "not applicable");
1013                         break;
1014                 case KEYCODE_c:
1015                         if (config_ctrl_c)
1016                                 quit = 1;
1017                         break;
1018                 case KEYCODE_o:
1019 #ifdef HAVE_OVR
1020                         normalize_observer_ovr();
1021                         osd_info("", "change height");
1022 #else
1023                         osd_info("", "not applicable");
1024 #endif
1025                         break;
1026                 case KEYCODE_KP_PLUS:
1027 #ifdef HAVE_OVR
1028                         osd_info("", "not applicable");
1029 #else
1030                         if (config_fov / 1.2 >= FOV_MIN)
1031                                 config_fov /= 1.2;
1032                         disp_fov:
1033                         {
1034                                 char text[16];
1035                                 sprintf(text, "%.2f", config_fov);
1036                                 osd_info("FOV", text);
1037                         }
1038 #endif
1039                         break;
1040                 case KEYCODE_KP_MINUS:
1041 #ifdef HAVE_OVR
1042                         osd_info("", "not applicable");
1043 #else
1044                         if (config_fov * 1.2 <= FOV_MAX)
1045                                 config_fov *= 1.2;
1046                         goto disp_fov;
1047 #endif
1048                         break;
1049                 default: break;
1050                 }
1051                 /* do not pass keys to game while holding CTRL */
1052                 return;
1053         }
1054
1055         if (keycode == KEYCODE_PAUSE && down) {
1056                 if (help_view == help_views)
1057                         help_view = 0;
1058                 else
1059                         help_view++;
1060         }
1061
1062         /* in help view we must not forward keypresses */
1063         if (help_view)
1064                 return;
1065
1066         switch (keycode) {
1067         case KEYCODE_LSHIFT:
1068                 set_amiga_key(keycode, down);
1069                 shift = down;
1070                 break;
1071         case KEYCODE_RSHIFT:
1072                 set_amiga_key(keycode, down);
1073                 shift = down;
1074                 break;
1075         case KEYCODE_LEFT:
1076                 if (shift && down) {
1077                         set_amiga_key(keycode, down);
1078                         set_joystick(-1, -1, -1, -1, -1);
1079                         break;
1080                 }
1081                 set_amiga_key(keycode, 0);
1082                 set_joystick(down, -1, -1, -1, -1);
1083                 break;
1084         case KEYCODE_RIGHT:
1085                 if (shift && down) {
1086                         set_amiga_key(keycode, down);
1087                         set_joystick(-1, -1, -1, -1, -1);
1088                         break;
1089                 }
1090                 set_amiga_key(keycode, 0);
1091                 set_joystick(-1, down, -1, -1, -1);
1092                 break;
1093         case KEYCODE_UP:
1094                 if (shift && down) {
1095                         set_amiga_key(keycode, down);
1096                         set_joystick(-1, -1, -1, -1, -1);
1097                         break;
1098                 }
1099                 set_amiga_key(keycode, 0);
1100                 set_joystick(-1, -1, down, -1, -1);
1101                 break;
1102         case KEYCODE_DOWN:
1103                 if (shift && down) {
1104                         set_amiga_key(keycode, down);
1105                         set_joystick(-1, -1, -1, -1, -1);
1106                         break;
1107                 }
1108                 set_amiga_key(keycode, 0);
1109                 set_joystick(-1, -1, -1, down, -1);
1110                 break;
1111         case KEYCODE_END:
1112                 set_joystick(-1, -1, -1, -1, down);
1113                 break;
1114         case KEYCODE_INSERT:
1115                 set_amiga_key(KEYCODE_HELP, down);
1116                 break;
1117         default:
1118                 set_amiga_key(keycode, down);
1119         }
1120 }
1121
1122 void audio_sdl(float *data, int length)
1123 {
1124         int fill, s;
1125
1126         /* read sound from sound buffer
1127          * buffer pointer read and write is atomic, so no locking required!
1128          */
1129         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
1130         if (fill < length) {
1131 #ifdef DEBUG_SOUND_BUFFERING
1132                 fprintf(stderr, "sound buffer underrun\n");
1133 #endif
1134                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
1135                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
1136         }
1137         for (s = 0; s < length; s++) {
1138                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
1139                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
1140         }
1141 #ifdef DEBUG_SOUND_BUFFERING
1142         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
1143 #endif
1144         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
1145 }
1146
1147 void sound_irq(void)
1148 {
1149         /* trigger and execute IRQ 4 = sound */
1150         execute_cpu(4, NULL);
1151 }
1152
1153 int main(int argc, char *argv[])
1154 {
1155         int rc;
1156         int sdl_sound_chunk;
1157
1158         home_dir = getenv("HOME");
1159         if (!home_dir)
1160                 home_dir = "";
1161
1162         rc = parse_args(argc, argv);
1163         if (rc)
1164                 return 0;
1165
1166         /* allocate image */
1167         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
1168         if (!image) {
1169                 print_error("Failed to allocate image buffer\n");
1170                 goto done;
1171         }
1172
1173         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
1174                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
1175                 goto done;
1176         }
1177         if ((1000 % IRQ_RATE)) {
1178                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
1179                 goto done;
1180         }
1181
1182         /* calculate SDL chunk size for audio
1183          * it must be a power of two, but not more than the chunk size for each IRQ!
1184          */
1185         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
1186                 ;
1187         sdl_sound_chunk >>= 1;
1188 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
1189
1190         /* allocate sound buffers */
1191         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
1192         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
1193         if (!sound_buffer) {
1194                 print_error("Failed to allocate image buffer\n");
1195                 goto done;
1196         }
1197
1198         /* allocate memory */
1199         memory = calloc(MEMORY_SIZE, 1);
1200         if (!memory) {
1201                 print_error("Failed to allocate cpu's memory\n");
1202                 goto done;
1203         }
1204         stop_event = calloc(MEMORY_SIZE, 1);
1205         if (!stop_event) {
1206                 print_error("Failed to allocate cpu's stop_event memory\n");
1207                 goto done;
1208         }
1209         chipreg = calloc(IOSIZE, 1);
1210         if (!chipreg) {
1211                 print_error("Failed to allocate chip register\n");
1212                 goto done;
1213         }
1214
1215         /* init cpu code */
1216         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
1217
1218         /* init disk emulation */
1219         disk_init(disk_read, disk_write);
1220
1221         /* load binary */
1222         mercenary_load();
1223
1224         /* patch some stuff */
1225         mercenary_patch();
1226
1227         /* init SDL and OpenGL */
1228 #ifdef HAVE_OVR
1229         int vbl_sync = 0;
1230         int rift = 1;
1231         int multisampling = 0;
1232         window_width = SCREEN_WIDTH;
1233         window_height = SCREEN_HEIGHT;
1234 #else
1235         int vbl_sync = 1;
1236         int rift = 0;
1237         int multisampling = config_multisampling;
1238         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1239         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1240 #endif
1241         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
1242         if (rc < 0)
1243                 goto done;
1244 #ifdef HAVE_OVR
1245         rc = init_ovr(config_multisampling);
1246         if (rc < 0)
1247                 goto done;
1248         rc = init_vr_keyboard(config_keyboard_height, config_keyboard_distance);
1249         if (rc < 0)
1250                 goto done;
1251 #endif
1252         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1253         if (rc < 0)
1254                 goto done;
1255
1256         /* init osd */
1257         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1258         if (rc < 0)
1259                 goto done;
1260         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1261         if (rc < 0)
1262                 goto done;
1263         help_osd[0] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1264         if (!help_osd[0])
1265                 goto done;
1266         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);
1267         text_render(help_osd[0], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1268                 "Emulation:\n"
1269                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1270                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1271                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1272                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1273                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1274                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1275                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1276                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1277                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1278 #ifdef HAVE_OVR
1279                 "        Press `CTRL' + `O' (or right trigger) to reset observer position.\n"
1280 #endif
1281                 "\n"
1282                 "Answer to a Question:\n"
1283                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1284                 "\n"
1285                 "Walking / Driving / Flying:\n"
1286                 "        Use cursor keys as joystick, to move player / craft.\n"
1287                 "        Press `R' for running, 'W' for walking speed.\n"
1288                 "        Press `B' to board, `L' to leave.\n"
1289                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1290                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1291                 "        Press `SPACE' to stop craft.\n"
1292                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1293                 "        Press `T' for turbo on certain craft.\n"
1294                 "        Press `END' as joystick's fire button.\n"
1295                 "\n"
1296                 "Elevator:\n"
1297                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1298                 "\n"
1299                 "Inside a transporter:\n"
1300                 "        Press `1'...`0' to select destination.\n"
1301                 "\n"
1302                 "Items:\n"
1303                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1304                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1305                 "        Press `NUMPAD Enter' to select certain items.\n"
1306                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1307                 "        Press `NUMPAD *' to read entry\n"
1308                 "Saving / Loading / Pause:\n"
1309                 "        Press `INSERT' to loading and saving options.\n"
1310                 "        Press `ENTER' to pause game, other key to continue.\n"
1311                 ,HELP_ALPHA, 1, 2, 5, 0);
1312 #ifdef HAVE_OVR
1313         help_osd[1] = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1314         if (!help_osd[1])
1315                 goto done;
1316         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);
1317         text_render(help_osd[1], IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1318                 "Emulation using Controller:\n"
1319                 "        Press `Enter' button to toggle this help screen on or off.\n"
1320                 "        Press `A' button to emulate keyboard to control game.\n"
1321                 "        Press `B' button to emulate keyboard to enter alphanumeric keys.\n"
1322                 "        Press `A' or `B' button again to dismiss keyboard.\n"
1323                 "        Point right controller to a key on keyboard. The key will highlight.\n"
1324                 "        Press `Trigger' on right controller enter the highlighted key.\n"
1325                 "\n"
1326                 "Walking / Driving / Flying using Controller:\n"
1327                 "        Use thumb stick on right controller, to move player / craft.\n"
1328                 "        Press `X' button to board, `Y' button to leave.\n"
1329                 "        Move thumb stick on left controller to drive/fly forward or backward.\n"
1330                 "        Press and hold thumb stick on left controller for escape sequence.\n"
1331                 "        Release thumb stick on left controller stop craft.\n"
1332                 "        Press `Trigger' on right controller to fire.\n"
1333                 "\n"
1334                 "For all other game function, use the emulated keyboards!\n"
1335                 ,HELP_ALPHA, 1, 2, 5, 0);
1336         help_views = 2;
1337 #endif
1338         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1339         if (!info_osd)
1340                 goto done;
1341
1342         /* init audio */
1343         sound_init(SOUND_SAMPLERATE, sound_irq);
1344
1345         /* start cpu */
1346         reset_cpu();
1347
1348         if (config_skip_intro)
1349                 skip_intro();
1350
1351         /* run game */
1352         main_loop();
1353
1354 done:
1355         exit_opengl();
1356 #ifdef HAVE_OVR
1357         exit_ovr();
1358 #endif
1359         exit_sdl();
1360
1361         if (chipreg)
1362                 free(chipreg);
1363         if (stop_event)
1364                 free(stop_event);
1365         if (memory)
1366                 free(memory);
1367         if (sound_buffer)
1368                 free(sound_buffer);
1369         if (image)
1370                 free(image);
1371         if (help_osd[0])
1372                 free(help_osd[0]);
1373         if (help_osd[1])
1374                 free(help_osd[1]);
1375         if (info_osd)
1376                 free(info_osd);
1377
1378         return 0;
1379 }
1380