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 <sys/stat.h>
  25 #include <sys/types.h>
  26 #include "../libsdl/sdl.h"
  27 #include "../libsdl/opengl.h"
  28 #include "../libsdl/print.h"
  29 #include "../libcpu/m68k.h"
  30 #include "../libcpu/execute.h"
  31 #include "../libframerate/framerate.h"
  32 #include "../libvideo/video.h"
  33 #include "../libsound/sound.h"
  34 #include "../libjoystick/joystick.h"
  35 #include "../libkeyboard/keyboard.h"
  36 #include "../libdisk/disk.h"
  37 #include "../libtext/text.h"
  38 #include "mercenary.h"
  39 #include "render.h"
  40
  41 #define FOV_MIN         10.0
  42 #define FOV_NOVAGEN     64.0
  43 #define FOV_JOLLY       80.0
  44 #define FOV_MAX         170.0
  45
  46 static int config_ctrl_c = 0;
  47 static int config_amiga_speed = 1;
  48 static double config_fps = 16.0;
  49 #if !defined(_WIN32)
  50 static const char *config_gamesave_dir = ".mercenary";
  51 #endif
  52 static int config_video_filter = 1;
  53 static int config_audio_filter = 1;
  54 static int config_render = 0;
  55 static int config_skip_intro = 0;
  56 static int config_multisampling = 16;
  57 static double config_fov = FOV_NOVAGEN;
  58 static double config_benson_size = 1.0;
  59 static int config_debug_transparent = 0;
  60 static int config_debug_opengl = 0;
  61 /* render improvements */
  62 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  63
  64 #define CPU_SPEED       7093790.0;
  65
  66 #define SOUND_SAMPLERATE 48000
  67 /* - game IRQ rate
  68  * - must be used for sound rendering chunk
  69  */
  70 #define IRQ_RATE        50
  71 /* numbe of buffer chunks to dejitter:
  72  * - SDL render interval
  73  * - sound rendering interval
  74  * - sound card interval
  75  * 4 should be minimum, if video rate is >=50 Hz
  76  */
  77 #define SOUND_CHUNKS    4
  78
  79 /* test sound to check if buffer does not overflow / underrun */
  80 //#define DEBUG_SOUND_BUFFERING
  81
  82 #define IOSIZE          0x1000 /* bytes in io space */
  83 #define MEMORY_SIZE     0x80000
  84 static uint8_t *memory = NULL;
  85 static uint8_t *stop_event = NULL;
  86 static uint8_t *image = NULL;
  87 static uint8_t *help_osd = NULL;
  88 static uint8_t *info_osd = NULL;
  89 static int help_view = 1;
  90 static int32_t osd_timer = 0;
  91 #define SCREEN_WIDTH    320
  92 #define SCREEN_HEIGHT   200
  93 #define IMAGE_WIDTH     320
  94 #define IMAGE_HEIGHT    200
  95 #define BENSON_AT_LINE  136
  96 #define IMAGE_DIWSTART  0x2c
  97 #define HELP_ALPHA      0xd0
  98 #define OSD_WIDTH       320
  99 #define OSD_HEIGHT      16
 100 static uint16_t *chipreg = NULL;
 101 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 102 static int sound_buffer_size; /* buffer sample size */
 103 static int sound_buffer_writep; /* write pointer at buffer */
 104 static int sound_buffer_readp; /* read pointer at buffer */
 105 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 106 static double benson_size; /* render size of benson */
 107 static int render_legacy = 0; /* render original amiga screen, if set */
 108 static int render_improved = 0; /* render improved image, if set */
 109 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 110 static int intro_skipped = 0; /* indicated if we already have landed */
 111
 112 static const char *home_dir;
 113
 114 static int quit = 0;
 115
 116 int parse_args(int argc, char *argv[])
 117 {
 118         int i = 1;
 119
 120         while (argc > i) {
 121                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 122                         print_info("Usage: %s\n", argv[0]);
 123                         print_info(" -s --render-speed original | fast\n");
 124                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 125                         print_info("    --fps <fps>\n");
 126                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 127                         print_info(" -v --video-filter on | off\n");
 128                         print_info("        Set video filter.\n");
 129                         print_info(" -a --audio-filter on | off\n");
 130                         print_info("        Set audio filter.\n");
 131                         print_info(" -r --render original | opengl\n");
 132                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 133                         print_info(" -b --benson normal | half\n");
 134                         print_info("        Size of 'Benson' (control panel).\n");
 135                         print_info(" -m --multisampling <samples>\n");
 136                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 137                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 138                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 139                         print_info(" -i --skip-intro\n");
 140                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 141                         print_info("Debug options:\n");
 142                         print_info(" -o --debug-opengl\n");
 143                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 144                         print_info("    --debug-transparent\n");
 145                         print_info("        Draw all things half transparent.\n");
 146                         print_info("    --ctrl-c\n");
 147                         print_info("        Use CTRL+C to exit game (used for development)\n");
 148                         return -1;
 149                 } else
 150                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 151                         i++;
 152                         if (argc == i) {
 153 missing_parameter:
 154                                 print_info("Missing parameter, use '--help'!\n");
 155                                 return -1;
 156                         }
 157                         if (!strcmp(argv[i], "original"))
 158                                 config_amiga_speed = 1;
 159                         else
 160                         if (!strcmp(argv[i], "fast"))
 161                                 config_amiga_speed = 0;
 162                         else {
 163 illegal_parameter:
 164                                 print_info("Illegal parameter, use '--help'!\n");
 165                                 return -1;
 166                         }
 167                 } else
 168                 if (!strcmp(argv[i], "--fps")) {
 169                         i++;
 170                         if (argc == i)
 171                                 goto missing_parameter;
 172                         config_fps = atof(argv[i]);
 173                         if (config_fov <= 0.0)
 174                                 goto illegal_parameter;
 175                 } else
 176                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 177                         i++;
 178                         if (argc == i)
 179                                 goto missing_parameter;
 180                         if (!strcmp(argv[i], "on"))
 181                                 config_video_filter = 1;
 182                         else
 183                         if (!strcmp(argv[i], "off"))
 184                                 config_video_filter = 0;
 185                         else
 186                                 goto illegal_parameter;
 187                 } else
 188                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 189                         i++;
 190                         if (argc == i)
 191                                 goto missing_parameter;
 192                         if (!strcmp(argv[i], "on"))
 193                                 config_audio_filter = 1;
 194                         else
 195                         if (!strcmp(argv[i], "off"))
 196                                 config_audio_filter = 0;
 197                         else
 198                                 goto illegal_parameter;
 199                 } else
 200                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 201                         i++;
 202                         if (argc == i)
 203                                 goto missing_parameter;
 204                         if (!strcmp(argv[i], "original"))
 205                                 config_render = 0;
 206                         else
 207                         if (!strcmp(argv[i], "opengl"))
 208                                 config_render = 1;
 209                         else
 210                                 goto illegal_parameter;
 211                 } else
 212                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 213                         i++;
 214                         if (argc == i)
 215                                 goto missing_parameter;
 216                         if (!strcmp(argv[i], "normal"))
 217                                 config_benson_size = 1.0;
 218                         else
 219                         if (!strcmp(argv[i], "half")) {
 220                                 config_benson_size = 0.5;
 221                                 if (config_fov == FOV_NOVAGEN)
 222                                         config_fov = FOV_JOLLY;
 223                         } else
 224                                 goto illegal_parameter;
 225                 } else
 226                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 227                         i++;
 228                         if (argc == i)
 229                                 goto missing_parameter;
 230                         config_multisampling = atoi(argv[i]);
 231                 } else
 232                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 233                         i++;
 234                         if (argc == i)
 235                                 goto missing_parameter;
 236                         config_fov = atof(argv[i]);
 237                         if (config_fov < 1.0 || config_fov > 179.0)
 238                                 goto illegal_parameter;
 239                 } else
 240                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 241                         config_skip_intro = 1;
 242                 } else
 243                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 244                         config_debug_opengl = 1;
 245                 } else
 246                 if (!strcmp(argv[i], "--debug-transparent")) {
 247                         config_debug_transparent = 1;
 248                 } else
 249                 if (!strcmp(argv[i], "--ctrl-c")) {
 250                         config_ctrl_c = 1;
 251                 } else {
 252                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 253                         return -1;
 254                 }
 255                 i++;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static void skip_intro(void)
 262 {
 263         int event;
 264         double render_delay = 0.0;
 265         double cycle_count;
 266
 267         if (intro_skipped)
 268                 return;
 269
 270         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 271         do {
 272                 /* render, if not delayed */
 273                 if (render_delay <= 0.0) {
 274                         cycle_count = 0;
 275                         do {
 276                                 cycle_count += execute_cpu(0, &event);
 277                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 278                         render_delay += (double)cycle_count / CPU_SPEED;
 279                 }
 280                 /* VBL */
 281                 execute_cpu(3, NULL);
 282                 /* count down render delay */
 283                 if (render_delay) {
 284                         render_delay -= 1.0 / (double)IRQ_RATE;
 285                         if (render_delay < 0.0)
 286                                 render_delay = 0.0;
 287                 }
 288         } while (event != STOP_AT_CLEAR_SCREEN1);
 289
 290         intro_skipped = 1;
 291 }
 292
 293 static void special_event(int event)
 294 {
 295         if (render_improved)
 296                 render_capture_event(event);
 297 }
 298
 299 static void main_loop(void)
 300 {
 301         double frame_step, frame_time = 0.0, frame_render = 1;
 302         int had_first_irq = 0;
 303         int render_improved_rc;
 304         static uint32_t current_time, last_time = 0, diff;
 305         int i, rc;
 306         int space, length;
 307         int cycle_count, event = STOP_AT_END;
 308         double render_delay = 0.0;
 309         uint32_t palette_address;
 310         uint16_t palette[16];
 311
 312         last_time = ticks_sdl();
 313
 314         /* render result on window */
 315         while (!quit) {
 316                 /* if we are in interstellar fligt, we use 50 Hz */
 317                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 318                 /* else we use whatever frame rate the user wants */
 319                 if (render_capture_is_interstellar())
 320                         frame_step = vbl_duration * 50.0;
 321                 else if (!intro_skipped)
 322                         frame_step = vbl_duration * 10.0;
 323                 else
 324                         frame_step = vbl_duration * config_fps;
 325                 if (frame_step > 1.0)
 326                         frame_step = 1.0;
 327                 /* handle SDL events */
 328                 rc = event_sdl();
 329                 if (rc)
 330                         break;
 331
 332                 /* clear screen */
 333                 opengl_clear();
 334
 335                 /* initialize rendering */
 336                 debug_opengl = config_debug_opengl;
 337                 benson_size = config_benson_size;
 338                 render_legacy = (!config_render) || debug_opengl;
 339                 render_improved = config_render || debug_opengl;
 340                 if (!render_improved) {
 341                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 342                         render_capture_reset();
 343                 }
 344                 if (render_improved)
 345                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 346                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 347                 /* amgia speed: don't render if we still delay */
 348                 /* non amiga speed: render if we need a new frame */
 349                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 350                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 351                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 352                 if (((frame_render && !config_amiga_speed)
 353                   || (config_amiga_speed && render_delay <= 0.0)
 354                   || event == STOP_AT_WAIT_INPUT)
 355                 && !(had_first_irq && help_view)) {
 356                         frame_render = 0;
 357                         /* start capturing for improved graphics */
 358                         if (render_improved)
 359                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 360
 361                         /* execute until the rendered image is ready (wait for VBL) */
 362                         cycle_count = 0;
 363                         do {
 364                                 cycle_count += execute_cpu(0, &event);
 365                                 /* handle special events */
 366                                 special_event(event);
 367                                 if (event == STOP_AT_CLEAR_SCREEN1)
 368                                         intro_skipped = 1;
 369                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 370                         /* stop capturing for improved graphics */
 371                         if (render_improved)
 372                                 render_capture_stop();
 373                         /* copy palette */
 374                         palette_address = mercenary_palette_view();
 375                         for (i = 0; i < 16; i++)
 376                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 377                         /* for amiga speed: set delay by the number of cycles */
 378                         if (config_amiga_speed)
 379                                 render_delay += (double)cycle_count / CPU_SPEED;
 380                 }
 381                 /* render improved graphics, interpolate, if required */
 382                 if (render_improved)
 383                         render_improved_rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 384                 else
 385                         render_improved_rc = -1;
 386                 /* advance frame time, if we are not in help view  */
 387                 if (!(had_first_irq && help_view)) {
 388                         frame_time += frame_step;
 389                         if (frame_time >= 1.0) {
 390                                 frame_time -= 1.0;
 391                                 frame_render = 1;
 392                         }
 393                 }
 394
 395                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 396                 if (had_first_irq) {
 397                         /* render game view without benson
 398                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 399                          */
 400                         if (render_legacy || render_improved_rc)
 401                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 402                 }
 403                 /* render benson + osd ontop of improved opengl rendering, if enabled */
 404                 if (render_improved && render_improved_rc == 0) {
 405                         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);
 406                         if (help_view)
 407                                 opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 1.0, 1.0, 0.0, 0.0);
 408                         if (osd_timer) {
 409                                 opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 0.5, 0.04, 0.5, -0.95);
 410                                 if (osd_timer - (int32_t)ticks_sdl() < 0)
 411                                         osd_timer = 0;
 412                         }
 413                 }
 414                 /* setup viewport for legacy image and render image, if enabled */
 415                 /* also render legacy, if render_improved failed due to not (yet) available items */
 416                 if (render_legacy || (render_improved && render_improved_rc)) {
 417                         opengl_viewport_legacy(debug_opengl);
 418                         opengl_blit_legacy(image, config_video_filter);
 419                         if (help_view)
 420                                 opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
 421                         if (osd_timer) {
 422                                 opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
 423                                 if (osd_timer - (int32_t)ticks_sdl() < 0)
 424                                         osd_timer = 0;
 425                         }
 426                 }
 427
 428                 /* at this point we are ready with our image, so we display */
 429                 swap_sdl();
 430                 /* measure frame rate */
 431                 framerate_measure();
 432
 433                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 434                 /* only do this, if we are not in help view */
 435                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 436                 if (!(had_first_irq && help_view)) {
 437                         current_time = ticks_sdl();
 438                         diff = current_time - last_time;
 439                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 440                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 441                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 442                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 443                         }
 444                         while (diff > 1000 / IRQ_RATE) {
 445                                 /* trigger and execute IRQ 3 = VBL */
 446                                 execute_cpu(3, NULL);
 447                                 had_first_irq = 1;
 448                                 /* transfer benson without game view
 449                                  * because we only got benson refreshed during VBL IRQ
 450                                  */
 451                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 452                                 /* render sound to sound buffer
 453                                  * buffer pointer read and write is atomic, so no locking required!
 454                                  */
 455                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 456                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 457 #ifdef DEBUG_SOUND_BUFFERING
 458                                         fprintf(stderr, "sound buffer overflow\n");
 459 #endif
 460                                         length = space;
 461                                 } else
 462                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 463 #ifdef DEBUG_SOUND_BUFFERING
 464                                 printf("can write %d, write %d\n", space, length);
 465                                 static int cnt = 0;
 466                                 int s;
 467                                 for (s = 0; s < length; s++) {
 468                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 469                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 470                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 471                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 472                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 473                                          cnt++;
 474                                 }
 475 #else
 476                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 477 #endif
 478                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 479                                 diff -= 1000 / IRQ_RATE;
 480                                 last_time += 1000 / IRQ_RATE;
 481
 482                                 /* count down render delay */
 483                                 if (render_delay) {
 484                                         render_delay -= 1.0 / (double)IRQ_RATE;
 485                                         if (render_delay < 0.0)
 486                                                 render_delay = 0.0;
 487                                 }
 488                         }
 489                 }
 490         }
 491 }
 492
 493 static uint16_t io_read(uint32_t address)
 494 {
 495         uint16_t value = 0xffff;
 496
 497         /* joystick and fire button */
 498         if (address == 0xbfe000 || address == 0xdff00c)
 499                 value &= emulate_joystick_read(address);
 500         /* keyboard */
 501         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 502                 value &= emulate_keyboard_read(address);
 503         /* diskette */
 504         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 505                 value &= emulate_disk_read(address);
 506
 507         return value;
 508 }
 509
 510 static void io_write(uint32_t address, uint16_t value)
 511 {
 512         /* dmacon and sound registers */
 513         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 514                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 515         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 516                 emulate_disk_write(address, value);
 517 }
 518
 519 /* two tracks with 0x1820 words of length */
 520 static uint8_t game_save[2][0x1820 << 1];
 521 static int last_track = 0;
 522
 523 /* game reads track with saved game */
 524 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 525 {
 526         if (length > sizeof(game_save[0])) {
 527                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 528                 return;
 529         }
 530
 531         /* if even track is selected, load game */
 532         if (!(track & 1)) {
 533                 char filename[256];
 534                 int gamesave_num = (track - 2) >> 1;
 535                 int got;
 536                 FILE *fp;
 537
 538                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 539 #if defined(_WIN32)
 540                 filename[0] = '\0';
 541 #else
 542                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 543                 mkdir(filename, 0777);
 544 #endif
 545                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 546                 fp = fopen(filename, "r");
 547                 if (!fp) {
 548 fail:
 549                         print_error("failed to load game from '%s'\n", filename);
 550                         goto copy;
 551                 }
 552                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 553                 fclose(fp);
 554                 if (got != 2)
 555                         goto fail;
 556         }
 557
 558 copy:
 559         /* copy track */
 560         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 561 }
 562
 563 /* game writes track with saved game */
 564 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 565 {
 566         /* skip sync info that is provided by game and only relevant for a real disk track */
 567         data += 0x200;
 568         length -= 0x200;
 569
 570         if (length != sizeof(game_save[0])) {
 571                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 572                 return;
 573         }
 574
 575         /* don't save if last track is the same, because disk is written on both sides with the same data */
 576         if (track == last_track) {
 577                 if (memcmp(memory + data, game_save[track & 1], length)) {
 578                         print_error("saving game data on other side of the disk is different, please fix!\n");
 579                 }
 580                 return;
 581         }
 582         last_track = track;
 583
 584         /* save game data */
 585         memcpy(game_save[track & 1], memory + data, length);
 586
 587         /* if done with saving */
 588         if ((track & 1)) {
 589                 char filename[256];
 590                 int gamesave_num = (track - 2) >> 1;
 591                 int wrote;
 592                 FILE *fp;
 593
 594 #if defined(_WIN32)
 595                 filename[0] = '\0';
 596 #else
 597                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 598                 mkdir(filename, 0777);
 599 #endif
 600                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 601                 fp = fopen(filename, "w");
 602                 if (!fp) {
 603 fail:
 604                         print_error("failed to save game to '%s'\n", filename);
 605                         return;
 606                 }
 607                 print_info("Game state saved to '%s'\n", filename);
 608                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 609                 fclose(fp);
 610                 if (wrote != 2)
 611                         goto fail;
 612         }
 613 }
 614
 615 static void osd_info(const char *param, const char *value)
 616 {
 617         char line[41] = "                                        ";
 618
 619         if (param[0]) {
 620                 strncpy(line + 21 - strlen(param), param, strlen(param));
 621                 line[22] = ':';
 622         }
 623         if (strlen(value) > 15) {
 624                 print_error("string too long\n");
 625                 return;
 626         }
 627         strncpy(line + 25, value, strlen(value));
 628         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 629         osd_timer = ticks_sdl() + 2500;
 630 }
 631
 632 static int shift = 0, ctrl = 0;
 633
 634 static void keyboard_sdl(int down, enum keycode keycode)
 635 {
 636         switch (keycode) {
 637         case KEYCODE_LCTRL:
 638         case KEYCODE_RCTRL:
 639                 ctrl = down;
 640                 break;
 641         default: break;
 642         }
 643
 644         if (ctrl && down) {
 645                 switch (keycode) {
 646                 case KEYCODE_h:
 647                         help_view ^= 1;
 648                         break;
 649                 case KEYCODE_v:
 650                         config_video_filter ^= 1;
 651                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 652                         break;
 653                 case KEYCODE_a:
 654                         config_audio_filter ^= 1;
 655                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 656                         break;
 657                 case KEYCODE_s:
 658                         config_amiga_speed ^= 1;
 659                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 660                         break;
 661                 case KEYCODE_r:
 662                         config_render ^= 1;
 663                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 664                         break;
 665                 case KEYCODE_b:
 666                         if (!config_render) {
 667                                 osd_info("", "not applicable");
 668                                 break;
 669                         }
 670                         if (config_benson_size == 0.5) {
 671                                 config_benson_size = 1.0;
 672                                 config_fov = FOV_NOVAGEN;
 673                         } else {
 674                                 config_benson_size = 0.5;
 675                                 config_fov = FOV_JOLLY;
 676                         }
 677                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 678                         break;
 679                 case KEYCODE_i:
 680                         if (!intro_skipped)
 681                                 skip_intro();
 682                         else
 683                                 osd_info("", "not applicable");
 684                         break;
 685                 case KEYCODE_c:
 686                         if (config_ctrl_c)
 687                                 quit = 1;
 688                         break;
 689                 case KEYCODE_KP_PLUS:
 690                         if (config_fov / 1.2 >= FOV_MIN)
 691                                 config_fov /= 1.2;
 692                         disp_fov:
 693                         {
 694                                 char text[16];
 695                                 sprintf(text, "%.2f", config_fov);
 696                                 osd_info("FOV", text);
 697                         }
 698                         break;
 699                 case KEYCODE_KP_MINUS:
 700                         if (config_fov * 1.2 <= FOV_MAX)
 701                                 config_fov *= 1.2;
 702                         goto disp_fov;
 703                 default: break;
 704                 }
 705                 /* do not pass keys to game while holding CTRL */
 706                 return;
 707         }
 708
 709         if (keycode == KEYCODE_PAUSE && down)
 710                 help_view ^= 1;
 711
 712         /* in help view we don't need to forward keypresses */
 713         if (help_view)
 714                 return;
 715
 716         switch (keycode) {
 717         case KEYCODE_LSHIFT:
 718                 set_key("LSH", down);
 719                 shift = down;
 720                 break;
 721         case KEYCODE_RSHIFT:
 722                 set_key("RSH", down);
 723                 shift = down;
 724                 break;
 725         case KEYCODE_LEFT:
 726                 if (shift && down) {
 727                         set_key("LF", down);
 728                         set_joystick(-1, -1, -1, -1, -1);
 729                         break;
 730                 }
 731                 set_key("LF", 0);
 732                 set_joystick(down, -1, -1, -1, -1);
 733                 break;
 734         case KEYCODE_RIGHT:
 735                 if (shift && down) {
 736                         set_key("RT", down);
 737                         set_joystick(-1, -1, -1, -1, -1);
 738                         break;
 739                 }
 740                 set_key("RT", 0);
 741                 set_joystick(-1, down, -1, -1, -1);
 742                 break;
 743         case KEYCODE_UP:
 744                 if (shift && down) {
 745                         set_key("UP", down);
 746                         set_joystick(-1, -1, -1, -1, -1);
 747                         break;
 748                 }
 749                 set_key("UP", 0);
 750                 set_joystick(-1, -1, down, -1, -1);
 751                 break;
 752         case KEYCODE_DOWN:
 753                 if (shift && down) {
 754                         set_key("DN", down);
 755                         set_joystick(-1, -1, -1, -1, -1);
 756                         break;
 757                 }
 758                 set_key("DN", 0);
 759                 set_joystick(-1, -1, -1, down, -1);
 760                 break;
 761         case KEYCODE_END:
 762                 set_joystick(-1, -1, -1, -1, down);
 763                 break;
 764
 765         case KEYCODE_a: set_key("A", down); break;
 766         case KEYCODE_b: set_key("B", down); break;
 767         case KEYCODE_c: set_key("C", down); break;
 768         case KEYCODE_d: set_key("D", down); break;
 769         case KEYCODE_e: set_key("E", down); break;
 770         case KEYCODE_f: set_key("F", down); break;
 771         case KEYCODE_g: set_key("G", down); break;
 772         case KEYCODE_h: set_key("H", down); break;
 773         case KEYCODE_i: set_key("I", down); break;
 774         case KEYCODE_j: set_key("J", down); break;
 775         case KEYCODE_k: set_key("K", down); break;
 776         case KEYCODE_l: set_key("L", down); break;
 777         case KEYCODE_m: set_key("M", down); break;
 778         case KEYCODE_n: set_key("N", down); break;
 779         case KEYCODE_o: set_key("O", down); break;
 780         case KEYCODE_p: set_key("P", down); break;
 781         case KEYCODE_q: set_key("Q", down); break;
 782         case KEYCODE_r: set_key("R", down); break;
 783         case KEYCODE_s: set_key("S", down); break;
 784         case KEYCODE_t: set_key("T", down); break;
 785         case KEYCODE_u: set_key("U", down); break;
 786         case KEYCODE_v: set_key("V", down); break;
 787         case KEYCODE_w: set_key("W", down); break;
 788         case KEYCODE_x: set_key("X", down); break;
 789         case KEYCODE_y: set_key("Y", down); break;
 790         case KEYCODE_z: set_key("Z", down); break;
 791
 792         case KEYCODE_0: set_key("0", down); break;
 793         case KEYCODE_1: set_key("1", down); break;
 794         case KEYCODE_2: set_key("2", down); break;
 795         case KEYCODE_3: set_key("3", down); break;
 796         case KEYCODE_4: set_key("4", down); break;
 797         case KEYCODE_5: set_key("5", down); break;
 798         case KEYCODE_6: set_key("6", down); break;
 799         case KEYCODE_7: set_key("7", down); break;
 800         case KEYCODE_8: set_key("8", down); break;
 801         case KEYCODE_9: set_key("9", down); break;
 802
 803         case KEYCODE_KP_0: set_key("NP0", down); break;
 804         case KEYCODE_KP_1: set_key("NP1", down); break;
 805         case KEYCODE_KP_2: set_key("NP2", down); break;
 806         case KEYCODE_KP_3: set_key("NP3", down); break;
 807         case KEYCODE_KP_4: set_key("NP4", down); break;
 808         case KEYCODE_KP_5: set_key("NP5", down); break;
 809         case KEYCODE_KP_6: set_key("NP6", down); break;
 810         case KEYCODE_KP_7: set_key("NP7", down); break;
 811         case KEYCODE_KP_8: set_key("NP8", down); break;
 812         case KEYCODE_KP_9: set_key("NP9", down); break;
 813         case KEYCODE_KP_DIVIDE: set_key("NPDIV", down); break;
 814         case KEYCODE_KP_MULTIPLY: set_key("NPMUL", down); break;
 815         case KEYCODE_KP_MINUS: set_key("NPSUB", down); break;
 816         case KEYCODE_KP_PLUS: set_key("NPADD", down); break;
 817         case KEYCODE_KP_PERIOD: set_key("NPDEL", down); break;
 818         // NPLPAREN and NPRPAREN are not emulated
 819
 820         case KEYCODE_F1: set_key("F1", down); break;
 821         case KEYCODE_F2: set_key("F2", down); break;
 822         case KEYCODE_F3: set_key("F3", down); break;
 823         case KEYCODE_F4: set_key("F4", down); break;
 824         case KEYCODE_F5: set_key("F5", down); break;
 825         case KEYCODE_F6: set_key("F6", down); break;
 826         case KEYCODE_F7: set_key("F7", down); break;
 827         case KEYCODE_F8: set_key("F8", down); break;
 828         case KEYCODE_F9: set_key("F9", down); break;
 829         case KEYCODE_F10: set_key("F10", down); break;
 830
 831         case KEYCODE_SPACE: set_key("SPC", down); break;
 832         case KEYCODE_BACKSPACE: set_key("BS", down); break;
 833         case KEYCODE_TAB: set_key("TAB", down); break;
 834         case KEYCODE_KP_ENTER: set_key("ENT", down); break;
 835         case KEYCODE_RETURN: set_key("RET", down); break;
 836         case KEYCODE_ESCAPE: set_key("ESC", down); break;
 837         case KEYCODE_DELETE: set_key("DEL", down); break;
 838         case KEYCODE_INSERT: set_key("HELP", down); break;
 839
 840         default: break;
 841         }
 842 }
 843
 844 void audio_sdl(float *data, int length)
 845 {
 846         int fill, s;
 847
 848         /* read sound from sound buffer
 849          * buffer pointer read and write is atomic, so no locking required!
 850          */
 851         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 852         if (fill < length) {
 853 #ifdef DEBUG_SOUND_BUFFERING
 854                 fprintf(stderr, "sound buffer underrun\n");
 855 #endif
 856                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 857                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 858         }
 859         for (s = 0; s < length; s++) {
 860                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 861                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 862         }
 863 #ifdef DEBUG_SOUND_BUFFERING
 864         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 865 #endif
 866         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 867 }
 868
 869 void sound_irq(void)
 870 {
 871         /* trigger and execute IRQ 4 = sound */
 872         execute_cpu(4, NULL);
 873 }
 874
 875 int main(int argc, char *argv[])
 876 {
 877         int rc;
 878         int sdl_sound_chunk;
 879
 880         home_dir = getenv("HOME");
 881         if (!home_dir)
 882                 home_dir = "";
 883
 884         rc = parse_args(argc, argv);
 885         if (rc)
 886                 return 0;
 887
 888         /* allocate image */
 889         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 890         if (!image) {
 891                 print_error("Failed to allocate image buffer\n");
 892                 goto done;
 893         }
 894
 895         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 896                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 897                 goto done;
 898         }
 899         if ((1000 % IRQ_RATE)) {
 900                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 901                 goto done;
 902         }
 903
 904         /* calculate SDL chunk size for audio
 905          * it must be a power of two, but not more than the chunk size for each IRQ!
 906          */
 907         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 908                 ;
 909         sdl_sound_chunk >>= 1;
 910 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 911
 912         /* allocate sound buffers */
 913         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 914         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 915         if (!sound_buffer) {
 916                 print_error("Failed to allocate image buffer\n");
 917                 goto done;
 918         }
 919
 920         /* allocate memory */
 921         memory = calloc(MEMORY_SIZE, 1);
 922         if (!memory) {
 923                 print_error("Failed to allocate cpu's memory\n");
 924                 goto done;
 925         }
 926         stop_event = calloc(MEMORY_SIZE, 1);
 927         if (!stop_event) {
 928                 print_error("Failed to allocate cpu's stop_event memory\n");
 929                 goto done;
 930         }
 931         chipreg = calloc(IOSIZE, 1);
 932         if (!chipreg) {
 933                 print_error("Failed to allocate chip register\n");
 934                 goto done;
 935         }
 936
 937         /* init cpu code */
 938         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 939
 940         /* init disk emulation */
 941         disk_init(disk_read, disk_write);
 942
 943         /* load binary */
 944         mercenary_load();
 945
 946         /* patch some stuff */
 947         mercenary_patch();
 948
 949         /* init SDL and OpenGL */
 950         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);
 951         if (rc < 0)
 952                 goto done;
 953         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 954         if (rc < 0)
 955                 goto done;
 956         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 957
 958         /* init osd */
 959         rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 960         if (rc < 0)
 961                 goto done;
 962         rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
 963         if (rc < 0)
 964                 goto done;
 965         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 966         if (!help_osd)
 967                 goto done;
 968         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 969         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 970                 "Emulation:\n"
 971                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 972                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 973                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 974                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 975                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 976                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 977                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 978                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 979                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 980                 "\n"
 981                 "Answer to a Question:\n"
 982                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 983                 "\n"
 984                 "Walking / Driving / Flying:\n"
 985                 "        Use cursor keys as joystick, to move player / craft.\n"
 986                 "        Press `R' for running, 'W' for walking speed.\n"
 987                 "        Press `B' to board, `L' to leave.\n"
 988                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 989                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 990                 "        Press `SPACE' to stop craft.\n"
 991                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
 992                 "        Press `T' for turbo on certain craft.\n"
 993                 "        Press `END' as joystick's fire button.\n"
 994                 "\n"
 995                 "Elevator:\n"
 996                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
 997                 "\n"
 998                 "Inside a transporter:\n"
 999                 "        Press `1'...`0' to select destination.\n"
1000                 "\n"
1001                 "Items:\n"
1002                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1003                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1004                 "        Press `NUMPAD Enter' to select certain items.\n"
1005                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1006                 "        Press `NUMPAD *' to read entry\n"
1007                 "Saving / Loading / Pause:\n"
1008                 "        Press `INSERT' to loading and saving options.\n"
1009                 "        Press `ENTER' to pause game, other key to continue.\n"
1010                 ,HELP_ALPHA, 1, 2, 5, 0);
1011         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1012         if (!info_osd)
1013                 goto done;
1014
1015         /* init audio */
1016         sound_init(SOUND_SAMPLERATE, sound_irq);
1017
1018         /* start cpu */
1019         reset_cpu();
1020
1021         if (config_skip_intro)
1022                 skip_intro();
1023
1024         /* run game */
1025         main_loop();
1026
1027 done:
1028         exit_opengl();
1029         exit_sdl();
1030
1031         if (chipreg)
1032                 free(chipreg);
1033         if (stop_event)
1034                 free(stop_event);
1035         if (memory)
1036                 free(memory);
1037         if (sound_buffer)
1038                 free(sound_buffer);
1039         if (image)
1040                 free(image);
1041         if (help_osd)
1042                 free(help_osd);
1043         if (info_osd)
1044                 free(info_osd);
1045
1046         return 0;
1047 }
1048