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