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 <sys/stat.h>
  24 #include <sys/types.h>
  25 #include "../libsdl/sdl.h"
  26 #include "../libsdl/opengl.h"
  27 #include "../libsdl/print.h"
  28 #include "../libcpu/m68k.h"
  29 #include "../libcpu/execute.h"
  30 #include "../libvideo/video.h"
  31 #include "../libsound/sound.h"
  32 #include "../libjoystick/joystick.h"
  33 #include "../libkeyboard/keyboard.h"
  34 #include "../libdisk/disk.h"
  35 #include "mercenary.h"
  36 #include "render.h"
  37
  38 #define FOV_MIN         10.0
  39 #define FOV_NOVAGEN     64.0
  40 #define FOV_JOLLY       80.0
  41 #define FOV_MAX         170.0
  42
  43 static int config_ctrl_c = 0;
  44 static int config_amiga_speed = 1;
  45 static const char *config_gamesave_dir = ".mercenary";
  46 static int config_video_filter = 1;
  47 static int config_audio_filter = 1;
  48 static int config_render = 0;
  49 static int config_skip_intro = 0;
  50 static int config_multisampling = 16;
  51 static double config_fov = FOV_NOVAGEN;
  52 static double config_benson_size = 1.0;
  53 static int config_debug_transparent = 0;
  54 static int config_debug_opengl = 0;
  55 /* render improvements */
  56 static int config_improve_extend_roads = 0;     /* set to 1 to extend roads */
  57
  58 #define CPU_SPEED       7093790.0;
  59
  60 #define SOUND_SAMPLERATE 48000
  61 /* - game IRQ rate
  62  * - must be used for sound rendering chunk
  63  */
  64 #define IRQ_RATE        50
  65 /* numbe of buffer chunks to dejitter:
  66  * - SDL render interval
  67  * - sound rendering interval
  68  * - sound card interval
  69  * 4 should be minimum, if video rate is >=50 Hz
  70  */
  71 #define SOUND_CHUNKS    4
  72
  73 /* test sound to check if buffer does not overflow / underrun */
  74 //#define DEBUG_SOUND_BUFFERING
  75
  76 #define IOSIZE          0x1000 /* bytes in io space */
  77 #define MEMORY_SIZE     0x80000
  78 static uint8_t *memory = NULL;
  79 static uint8_t *stop_event = NULL;
  80 static uint8_t *image = NULL;
  81 #define SCREEN_WIDTH    320
  82 #define SCREEN_HEIGHT   200
  83 #define IMAGE_WIDTH     320
  84 #define IMAGE_HEIGHT    200
  85 #define BENSON_AT_LINE  136
  86 #define IMAGE_DIWSTART  0x2c
  87 static uint16_t *chipreg = NULL;
  88 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
  89 static int sound_buffer_size; /* buffer sample size */
  90 static int sound_buffer_writep; /* write pointer at buffer */
  91 static int sound_buffer_readp; /* read pointer at buffer */
  92 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
  93 static double benson_size; /* render size of benson */
  94 static int render_legacy = 0; /* render original amiga screen, if set */
  95 static int render_improved = 0; /* render improved image, if set */
  96 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
  97
  98 static const char *home_dir;
  99
 100 static int quit = 0;
 101
 102 int parse_args(int argc, char *argv[])
 103 {
 104         int i = 1;
 105
 106         while (argc > i) {
 107                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 108                         print_info("Usage: %s\n", argv[0]);
 109                         print_info(" -s --amiga-speed original | full\n");
 110                         print_info("        Set speed of rendering to original Amiga or full speed.\n");
 111                         print_info(" -v --video-filter on | off\n");
 112                         print_info("        Set video filter.\n");
 113                         print_info(" -a --audio-filter on | off\n");
 114                         print_info("        Set audio filter.\n");
 115                         print_info(" -r --render original | opegl\n");
 116                         print_info("        Set speed of rendering to original Amiga or full speed.\n");
 117                         print_info(" -b --benson normal | half\n");
 118                         print_info("        Size of 'Benson' (control panel).\n");
 119                         print_info(" -m --multisampling <samples>\n");
 120                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 121                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 122                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 123                         print_info(" -i --skip-intro\n");
 124                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 125                         print_info("Debug options:\n");
 126                         print_info(" -o --debug-opengl\n");
 127                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 128                         print_info("    --debug-transparent\n");
 129                         print_info("        Draw all things half transparent.\n");
 130                         print_info("    --ctrl-c\n");
 131                         print_info("        Use CTRL+C to exit game (used for development)\n");
 132                         return -1;
 133                 } else
 134                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--amiga-speed")) {
 135                         i++;
 136                         if (argc == i) {
 137 missing_parameter:
 138                                 print_info("Missing parameter, use '--help'!\n");
 139                                 return -1;
 140                         }
 141                         if (!strcmp(argv[i], "original"))
 142                                 config_amiga_speed = 1;
 143                         else
 144                         if (!strcmp(argv[i], "full"))
 145                                 config_amiga_speed = 0;
 146                         else {
 147 illegal_parameter:
 148                                 print_info("Illegal parameter, use '--help'!\n");
 149                                 return -1;
 150                         }
 151                 } else
 152                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 153                         i++;
 154                         if (argc == i)
 155                                 goto missing_parameter;
 156                         if (!strcmp(argv[i], "on"))
 157                                 config_video_filter = 1;
 158                         else
 159                         if (!strcmp(argv[i], "off"))
 160                                 config_video_filter = 0;
 161                         else
 162                                 goto illegal_parameter;
 163                 } else
 164                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 165                         i++;
 166                         if (argc == i)
 167                                 goto missing_parameter;
 168                         if (!strcmp(argv[i], "on"))
 169                                 config_audio_filter = 1;
 170                         else
 171                         if (!strcmp(argv[i], "off"))
 172                                 config_audio_filter = 0;
 173                         else
 174                                 goto illegal_parameter;
 175                 } else
 176                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 177                         i++;
 178                         if (argc == i)
 179                                 goto missing_parameter;
 180                         if (!strcmp(argv[i], "original"))
 181                                 config_render = 0;
 182                         else
 183                         if (!strcmp(argv[i], "opengl"))
 184                                 config_render = 1;
 185                         else
 186                                 goto illegal_parameter;
 187                 } else
 188                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 189                         i++;
 190                         if (argc == i)
 191                                 goto missing_parameter;
 192                         if (!strcmp(argv[i], "normal"))
 193                                 config_benson_size = 1.0;
 194                         else
 195                         if (!strcmp(argv[i], "half")) {
 196                                 config_benson_size = 0.5;
 197                                 if (config_fov == FOV_NOVAGEN)
 198                                         config_fov = FOV_JOLLY;
 199                         } else
 200                                 goto illegal_parameter;
 201                 } else
 202                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 203                         i++;
 204                         if (argc == i)
 205                                 goto missing_parameter;
 206                         config_multisampling = atoi(argv[i]);
 207                 } else
 208                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 209                         i++;
 210                         if (argc == i)
 211                                 goto missing_parameter;
 212                         config_fov = atof(argv[i]);
 213                         if (config_fov < 1.0 || config_fov > 179.0)
 214                                 goto illegal_parameter;
 215                 } else
 216                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 217                         config_skip_intro = 1;
 218                 } else
 219                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 220                         config_debug_opengl = 1;
 221                 } else
 222                 if (!strcmp(argv[i], "--debug-transparent")) {
 223                         config_debug_transparent = 1;
 224                 } else
 225                 if (!strcmp(argv[i], "--ctrl-c")) {
 226                         config_ctrl_c = 1;
 227                 } else {
 228                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 229                         return -1;
 230                 }
 231                 i++;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static void special_event(int event)
 238 {
 239         if (render_improved)
 240                 render_improved_event(event);
 241 }
 242
 243 static void main_loop(void)
 244 {
 245         int had_first_irq = 0;
 246         static uint32_t current_time, last_time = 0, diff;
 247         int i, rc;
 248         int space, length;
 249         int cycle_count, event;
 250         double render_delay = 0.0;
 251         uint32_t palette_address;
 252         uint16_t palette[16];
 253
 254         last_time = SDL_GetTicks();
 255
 256         /* render result on window */
 257         while (!quit) {
 258                 /* handle SDL events */
 259                 rc = event_sdl();
 260                 if (rc)
 261                         break;
 262
 263                 /* clear screen */
 264                 opengl_clear();
 265
 266                 /* initialize rendering */
 267                 debug_opengl = config_debug_opengl;
 268                 benson_size = config_benson_size;
 269                 render_legacy = (!config_render) || debug_opengl;
 270                 render_improved = config_render || debug_opengl;
 271                 if (render_improved) {
 272                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 273                         opengl_copy_last();
 274                 }
 275                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 276                 /* don't render if we still delay */
 277                 if (!render_delay) {
 278                         /* start rendering for improved graphics */
 279                         if (render_improved)
 280                                 render_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 281
 282                         /* execute until the rendered image is ready (wait for VBL) */
 283                         cycle_count = 0;
 284                         do {
 285                                 cycle_count += execute_cpu(0, &event);
 286                                 /* handle special events */
 287                                 if (event != STOP_AT_WAIT_VBL)
 288                                         special_event(event);
 289                         } while (event != STOP_AT_WAIT_VBL);
 290                         /* copy palette */
 291                         palette_address = mercenary_palette_view();
 292                         for (i = 0; i < 16; i++)
 293                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 294                         /* for amiga speed: set delay by the number of cycles */
 295                         if (config_amiga_speed)
 296                                 render_delay = (double)cycle_count / CPU_SPEED;
 297                 }
 298
 299                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 300                 if (had_first_irq) {
 301                         /* render game view without benson
 302                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 303                          */
 304                         if (render_legacy)
 305                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 306                 }
 307                 /* render benson on improved rendering, if enabled */
 308                 if (render_improved) {
 309                         render_finish();
 310                         opengl_blit_benson(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, (double_pixel_size) ? 2 : 1);
 311                 }
 312                 /* setup viewport for legacy image and render image, if enabled */
 313                 if (render_legacy) {
 314                         opengl_viewport_legacy(debug_opengl);
 315                         opengl_blit_legacy(image, config_video_filter);
 316                 }
 317                 swap_sdl();
 318
 319                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 320                 current_time = SDL_GetTicks();
 321                 diff = current_time - last_time;
 322                 /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 323                 if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 324                         diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 325                         last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 326                 }
 327                 while (diff > 1000 / IRQ_RATE) {
 328                         execute_cpu(3, NULL);
 329                         execute_cpu(4, NULL);
 330                         had_first_irq = 1;
 331                         /* transfer benson without game view
 332                          * because we only got benson refreshed during VBL IRQ
 333                          */
 334                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 335                         /* render sound to sound buffer
 336                          * buffer pointer read and write is atomic, so no locking required!
 337                          */
 338                         space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 339                         if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 340 #ifdef DEBUG_SOUND_BUFFERING
 341                                 fprintf(stderr, "sound buffer overflow\n");
 342 #endif
 343                                 length = space;
 344                         } else
 345                                 length = SOUND_SAMPLERATE / IRQ_RATE;
 346 #ifdef DEBUG_SOUND_BUFFERING
 347                         printf("can write %d, write %d\n", space, length);
 348                         static int cnt = 0;
 349                         int s;
 350                         for (s = 0; s < length; s++) {
 351                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 352                                 sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 353                                         = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 354                                         * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 355                                         * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 356                                  cnt++;
 357                         }
 358 #else
 359                         render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 360 #endif
 361                         sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 362                         diff -= 1000 / IRQ_RATE;
 363                         last_time += 1000 / IRQ_RATE;
 364
 365                         /* count down render delay */
 366                         if (render_delay) {
 367                                 render_delay -= 1.0 / (double)IRQ_RATE;
 368                                 if (render_delay < 0.0)
 369                                         render_delay = 0.0;
 370                         }
 371                 }
 372         }
 373 }
 374
 375 static uint16_t io_read(uint32_t address)
 376 {
 377         uint16_t value = 0xffff;
 378
 379         /* joystick and fire button */
 380         if (address == 0xbfe000 || address == 0xdff00c)
 381                 value &= emulate_joystick_read(address);
 382         /* keyboard */
 383         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 384                 value &= emulate_keyboard_read(address);
 385         /* diskette */
 386         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 387                 value &= emulate_disk_read(address);
 388
 389         return value;
 390 }
 391
 392 static void io_write(uint32_t address, uint16_t value)
 393 {
 394         /* dmacon and sound registers */
 395         if (address == 0xdff096 || (address >= 0xdff0a0 && address <= 0xdff0df))
 396                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 397         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 398                 emulate_disk_write(address, value);
 399 }
 400
 401 /* two tracks with 0x1820 words of length */
 402 static uint8_t game_save[2][0x1820 << 1];
 403 static int last_track = 0;
 404
 405 /* game reads track with saved game */
 406 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 407 {
 408         if (length > sizeof(game_save[0])) {
 409                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 410                 return;
 411         }
 412
 413         /* if even track is selected, load game */
 414         if (!(track & 1)) {
 415                 char filename[256];
 416                 int gamesave_num = (track - 2) >> 1;
 417                 int got;
 418                 FILE *fp;
 419
 420                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 421 #if defined(_WIN32)
 422                 filename[0] = '\0';
 423 #else
 424                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 425                 mkdir(filename, 0777);
 426 #endif
 427                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 428                 fp = fopen(filename, "r");
 429                 if (!fp) {
 430 fail:
 431                         print_error("failed to load game from '%s'\n", filename);
 432                         goto copy;
 433                 }
 434                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 435                 fclose(fp);
 436                 if (got != 2)
 437                         goto fail;
 438         }
 439
 440 copy:
 441         /* copy track */
 442         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 443 }
 444
 445 /* game writes track with saved game */
 446 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 447 {
 448         /* skip sync info that is provided by game and only relevant for a real disk track */
 449         data += 0x200;
 450         length -= 0x200;
 451
 452         if (length != sizeof(game_save[0])) {
 453                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 454                 return;
 455         }
 456
 457         /* don't save if last track is the same, because disk is written on both sides with the same data */
 458         if (track == last_track) {
 459                 if (memcmp(memory + data, game_save[track & 1], length)) {
 460                         print_error("saving game data on other side of the disk is different, please fix!\n");
 461                 }
 462                 return;
 463         }
 464         last_track = track;
 465
 466         /* save game data */
 467         memcpy(game_save[track & 1], memory + data, length);
 468
 469         /* if done with saving */
 470         if ((track & 1)) {
 471                 char filename[256];
 472                 int gamesave_num = (track - 2) >> 1;
 473                 int wrote;
 474                 FILE *fp;
 475
 476 #if defined(_WIN32)
 477                 filename[0] = '\0';
 478 #else
 479                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 480                 mkdir(filename, 0777);
 481 #endif
 482                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 483                 fp = fopen(filename, "w");
 484                 if (!fp) {
 485 fail:
 486                         print_error("failed to save game to '%s'\n", filename);
 487                         return;
 488                 }
 489                 print_info("Game state saved to '%s'\n", filename);
 490                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 491                 fclose(fp);
 492                 if (wrote != 2)
 493                         goto fail;
 494         }
 495 }
 496
 497 static int shift = 0, ctrl = 0;
 498
 499 static void keyboard_sdl(int down, SDL_Keycode sym)
 500 {
 501         switch (sym) {
 502         case SDLK_LCTRL:
 503         case SDLK_RCTRL:
 504                 ctrl = down;
 505                 break;
 506         }
 507
 508         if (ctrl) {
 509                 switch (sym) {
 510                 case SDLK_v:
 511                         if (down) {
 512                                 config_video_filter ^= 1;
 513                                 print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
 514                         }
 515                         break;
 516                 case SDLK_a:
 517                         if (down) {
 518                                 config_audio_filter ^= 1;
 519                                 print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
 520                         }
 521                         break;
 522                 case SDLK_s:
 523                         if (down) {
 524                                 config_amiga_speed ^= 1;
 525                                 print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
 526                         }
 527                         break;
 528                 case SDLK_r:
 529                         if (down) {
 530                                 config_render ^= 1;
 531                                 print_info("render: %s\n", (config_render) ? "opengl" : "original");
 532                         }
 533                         break;
 534                 case SDLK_b:
 535                         if (down) {
 536                                 if (config_benson_size == 0.5) {
 537                                         config_benson_size = 1.0;
 538                                         config_fov = FOV_NOVAGEN;
 539                                 } else {
 540                                         config_benson_size = 0.5;
 541                                         config_fov = FOV_JOLLY;
 542                                 }
 543                                 print_info("benson: %s\n", (config_benson_size == 0.5) ? "half" : "normal");
 544                         }
 545                         break;
 546                 case SDLK_c:
 547                         if (down) {
 548                                 if (config_ctrl_c)
 549                                         quit = 1;
 550                         }
 551                         break;
 552                 case SDLK_KP_PLUS:
 553                         if (down) {
 554                                 if (config_fov / 1.2 >= FOV_MIN)
 555                                         config_fov /= 1.2;
 556                                 print_info("FOV: %.2f\n", config_fov);
 557                         }
 558                         break;
 559                 case SDLK_KP_MINUS:
 560                         if (down) {
 561                                 if (config_fov * 1.2 <= FOV_MAX)
 562                                         config_fov *= 1.2;
 563                                 print_info("FOV: %.2f\n", config_fov);
 564                         }
 565                         break;
 566                 }
 567                 /* do not pass keys to game while holding CTRL */
 568                 return;
 569         }
 570
 571         switch (sym) {
 572         case SDLK_LSHIFT:
 573                 set_key("LSH", down);
 574                 shift = down;
 575                 break;
 576         case SDLK_RSHIFT:
 577                 set_key("RSH", down);
 578                 shift = down;
 579                 break;
 580         case SDLK_LEFT:
 581                 if (shift && down) {
 582                         set_key("LF", down);
 583                         set_joystick(-1, -1, -1, -1, -1);
 584                         break;
 585                 }
 586                 set_key("LF", 0);
 587                 set_joystick(down, -1, -1, -1, -1);
 588                 break;
 589         case SDLK_RIGHT:
 590                 if (shift && down) {
 591                         set_key("RT", down);
 592                         set_joystick(-1, -1, -1, -1, -1);
 593                         break;
 594                 }
 595                 set_key("RT", 0);
 596                 set_joystick(-1, down, -1, -1, -1);
 597                 break;
 598         case SDLK_UP:
 599                 if (shift && down) {
 600                         set_key("UP", down);
 601                         set_joystick(-1, -1, -1, -1, -1);
 602                         break;
 603                 }
 604                 set_key("UP", 0);
 605                 set_joystick(-1, -1, down, -1, -1);
 606                 break;
 607         case SDLK_DOWN:
 608                 if (shift && down) {
 609                         set_key("DN", down);
 610                         set_joystick(-1, -1, -1, -1, -1);
 611                         break;
 612                 }
 613                 set_key("DN", 0);
 614                 set_joystick(-1, -1, -1, down, -1);
 615                 break;
 616         case SDLK_END:
 617                 set_joystick(-1, -1, -1, -1, down);
 618                 break;
 619
 620         case SDLK_a: set_key("A", down); break;
 621         case SDLK_b: set_key("B", down); break;
 622         case SDLK_c: set_key("C", down); break;
 623         case SDLK_d: set_key("D", down); break;
 624         case SDLK_e: set_key("E", down); break;
 625         case SDLK_f: set_key("F", down); break;
 626         case SDLK_g: set_key("G", down); break;
 627         case SDLK_h: set_key("H", down); break;
 628         case SDLK_i: set_key("I", down); break;
 629         case SDLK_j: set_key("J", down); break;
 630         case SDLK_k: set_key("K", down); break;
 631         case SDLK_l: set_key("L", down); break;
 632         case SDLK_m: set_key("M", down); break;
 633         case SDLK_n: set_key("N", down); break;
 634         case SDLK_o: set_key("O", down); break;
 635         case SDLK_p: set_key("P", down); break;
 636         case SDLK_q: set_key("Q", down); break;
 637         case SDLK_r: set_key("R", down); break;
 638         case SDLK_s: set_key("S", down); break;
 639         case SDLK_t: set_key("T", down); break;
 640         case SDLK_u: set_key("U", down); break;
 641         case SDLK_v: set_key("V", down); break;
 642         case SDLK_w: set_key("W", down); break;
 643         case SDLK_x: set_key("X", down); break;
 644         case SDLK_y: set_key("Y", down); break;
 645         case SDLK_z: set_key("Z", down); break;
 646
 647         case SDLK_0: set_key("0", down); break;
 648         case SDLK_1: set_key("1", down); break;
 649         case SDLK_2: set_key("2", down); break;
 650         case SDLK_3: set_key("3", down); break;
 651         case SDLK_4: set_key("4", down); break;
 652         case SDLK_5: set_key("5", down); break;
 653         case SDLK_6: set_key("6", down); break;
 654         case SDLK_7: set_key("7", down); break;
 655         case SDLK_8: set_key("8", down); break;
 656         case SDLK_9: set_key("9", down); break;
 657
 658         case SDLK_KP_0: set_key("NP0", down); break;
 659         case SDLK_KP_1: set_key("NP1", down); break;
 660         case SDLK_KP_2: set_key("NP2", down); break;
 661         case SDLK_KP_3: set_key("NP3", down); break;
 662         case SDLK_KP_4: set_key("NP4", down); break;
 663         case SDLK_KP_5: set_key("NP5", down); break;
 664         case SDLK_KP_6: set_key("NP6", down); break;
 665         case SDLK_KP_7: set_key("NP7", down); break;
 666         case SDLK_KP_8: set_key("NP8", down); break;
 667         case SDLK_KP_9: set_key("NP9", down); break;
 668         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 669         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 670         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 671         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 672         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 673         // NPLPAREN and NPRPAREN are not emulated
 674
 675         case SDLK_F1: set_key("F1", down); break;
 676         case SDLK_F2: set_key("F2", down); break;
 677         case SDLK_F3: set_key("F3", down); break;
 678         case SDLK_F4: set_key("F4", down); break;
 679         case SDLK_F5: set_key("F5", down); break;
 680         case SDLK_F6: set_key("F6", down); break;
 681         case SDLK_F7: set_key("F7", down); break;
 682         case SDLK_F8: set_key("F8", down); break;
 683         case SDLK_F9: set_key("F9", down); break;
 684         case SDLK_F10: set_key("F10", down); break;
 685
 686         case SDLK_SPACE: set_key("SPC", down); break;
 687         case SDLK_BACKSPACE: set_key("BS", down); break;
 688         case SDLK_TAB: set_key("TAB", down); break;
 689         case SDLK_KP_ENTER: set_key("ENT", down); break;
 690         case SDLK_RETURN: set_key("RET", down); break;
 691         case SDLK_ESCAPE: set_key("ESC", down); break;
 692         case SDLK_DELETE: set_key("DEL", down); break;
 693         case SDLK_INSERT: set_key("HELP", down); break;
 694
 695         }
 696 }
 697
 698 void audio_sdl(float *data, int length)
 699 {
 700         int fill, s;
 701
 702         /* read sound from sound buffer
 703          * buffer pointer read and write is atomic, so no locking required!
 704          */
 705         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 706         if (fill < length) {
 707 #ifdef DEBUG_SOUND_BUFFERING
 708                 fprintf(stderr, "sound buffer underrun\n");
 709 #endif
 710                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 711                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 712         }
 713         for (s = 0; s < length; s++) {
 714                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 715                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 716         }
 717 #ifdef DEBUG_SOUND_BUFFERING
 718         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 719 #endif
 720         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 721 }
 722
 723 int main(int argc, char *argv[])
 724 {
 725         int rc;
 726         int sdl_sound_chunk;
 727
 728         home_dir = getenv("HOME");
 729         if (!home_dir)
 730                 home_dir = "";
 731
 732         rc = parse_args(argc, argv);
 733         if (rc)
 734                 return 0;
 735
 736         /* allocate image */
 737         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 738         if (!image) {
 739                 print_error("Failed to allocate image buffer\n");
 740                 goto done;
 741         }
 742
 743         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 744                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 745                 goto done;
 746         }
 747         if ((1000 % IRQ_RATE)) {
 748                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 749                 goto done;
 750         }
 751
 752         /* calculate SDL chunk size for audio
 753          * it must be a power of two, but not more than the chunk size for each IRQ!
 754          */
 755         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 756                 ;
 757         sdl_sound_chunk >>= 1;
 758 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 759
 760         /* allocate sound buffers */
 761         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 762         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 763         if (!sound_buffer) {
 764                 print_error("Failed to allocate image buffer\n");
 765                 goto done;
 766         }
 767
 768         /* allocate memory */
 769         memory = calloc(MEMORY_SIZE, 1);
 770         if (!memory) {
 771                 print_error("Failed to allocate cpu's memory\n");
 772                 goto done;
 773         }
 774         stop_event = calloc(MEMORY_SIZE, 1);
 775         if (!stop_event) {
 776                 print_error("Failed to allocate cpu's stop_event memory\n");
 777                 goto done;
 778         }
 779         chipreg = calloc(IOSIZE, 1);
 780         if (!chipreg) {
 781                 print_error("Failed to allocate chip register\n");
 782                 goto done;
 783         }
 784
 785         /* init cpu code */
 786         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 787
 788         /* init disk emulation */
 789         disk_init(disk_read, disk_write);
 790
 791         /* load binary */
 792         mercenary_load();
 793
 794         /* patch some stuff */
 795         mercenary_patch();
 796
 797         /* init SDL and OpenGL */
 798         rc = init_sdl(argv[0], (config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, config_multisampling);
 799         if (rc < 0)
 800                 goto done;
 801         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 802         if (rc < 0)
 803                 goto done;
 804         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 805
 806         /* init audio filter */
 807         sound_init_filter(SOUND_SAMPLERATE);
 808
 809         /* start cpu */
 810         reset_cpu();
 811
 812         if (config_skip_intro) {
 813                 int event;
 814
 815                 print_info("*** Skipping intro, fast forwarding... ***\n\n");
 816                 do {
 817                         execute_cpu(0, &event);
 818                 } while (event != STOP_AT_CLEAR_SCREEN1);
 819                 do {
 820                         execute_cpu(0, &event);
 821                 } while (event != STOP_AT_WAIT_VBL);
 822         }
 823
 824         print_info("**********************************\n");
 825         print_info("* Welcome to Mercenary Reloaded! *\n");
 826         print_info("**********************************\n\n");
 827         print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
 828         print_info("Press CTRL + f to toggle full screen.\n");
 829         print_info("Press CTRL + s to toggle rendering speed.\n");
 830         print_info("Press CTRL + v to toggle video filter.\n");
 831         print_info("Press CTRL + a to toggle audio filter.\n");
 832         print_info("Press CTRL + r to toggle rendering with opengl or orignal code.\n");
 833         print_info("Press CTRL + Keypad Plus to decrement FOV.\n");
 834         print_info("Press CTRL + Keypad Minus to increment FOV.\n");
 835         print_info("Press CTRL + c to exit game.\n\n");
 836         print_info("Use '--help' as command line option for configuration settings.\n\n");
 837
 838         /* run game */
 839         main_loop();
 840
 841 done:
 842         exit_opengl();
 843         exit_sdl();
 844
 845         if (chipreg)
 846                 free(chipreg);
 847         if (stop_event)
 848                 free(stop_event);
 849         if (memory)
 850                 free(memory);
 851         if (sound_buffer)
 852                 free(sound_buffer);
 853         if (image)
 854                 free(image);
 855
 856         return 0;
 857 }
 858