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 "../libtext/text.h"
  37 #include "mercenary.h"
  38 #include "render.h"
  39
  40 #define FOV_MIN         10.0
  41 #define FOV_NOVAGEN     64.0
  42 #define FOV_JOLLY       80.0
  43 #define FOV_MAX         170.0
  44
  45 static int config_ctrl_c = 0;
  46 static int config_amiga_speed = 1;
  47 #warning fixme: make use of 10 for intro, then be as fast as given
  48 static double config_fps = 16.0;
  49 static const char *config_gamesave_dir = ".mercenary";
  50 static int config_video_filter = 1;
  51 static int config_audio_filter = 1;
  52 static int config_render = 0;
  53 static int config_skip_intro = 0;
  54 static int config_multisampling = 16;
  55 static double config_fov = FOV_NOVAGEN;
  56 static double config_benson_size = 1.0;
  57 static int config_debug_transparent = 0;
  58 static int config_debug_opengl = 0;
  59 /* render improvements */
  60 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  61
  62 #define CPU_SPEED       7093790.0;
  63
  64 #define SOUND_SAMPLERATE 48000
  65 /* - game IRQ rate
  66  * - must be used for sound rendering chunk
  67  */
  68 #define IRQ_RATE        50
  69 /* numbe of buffer chunks to dejitter:
  70  * - SDL render interval
  71  * - sound rendering interval
  72  * - sound card interval
  73  * 4 should be minimum, if video rate is >=50 Hz
  74  */
  75 #define SOUND_CHUNKS    4
  76
  77 /* test sound to check if buffer does not overflow / underrun */
  78 //#define DEBUG_SOUND_BUFFERING
  79
  80 #define IOSIZE          0x1000 /* bytes in io space */
  81 #define MEMORY_SIZE     0x80000
  82 static uint8_t *memory = NULL;
  83 static uint8_t *stop_event = NULL;
  84 static uint8_t *image = NULL;
  85 static uint8_t *help_osd = NULL;
  86 static uint8_t *info_osd = NULL;
  87 static int help_view = 1;
  88 static int32_t osd_timer = 0;
  89 #define SCREEN_WIDTH    320
  90 #define SCREEN_HEIGHT   200
  91 #define IMAGE_WIDTH     320
  92 #define IMAGE_HEIGHT    200
  93 #define BENSON_AT_LINE  136
  94 #define IMAGE_DIWSTART  0x2c
  95 #define HELP_ALPHA      0xd0
  96 #define OSD_WIDTH       320
  97 #define OSD_HEIGHT      16
  98 static uint16_t *chipreg = NULL;
  99 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 100 static int sound_buffer_size; /* buffer sample size */
 101 static int sound_buffer_writep; /* write pointer at buffer */
 102 static int sound_buffer_readp; /* read pointer at buffer */
 103 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 104 static double benson_size; /* render size of benson */
 105 static int render_legacy = 0; /* render original amiga screen, if set */
 106 static int render_improved = 0; /* render improved image, if set */
 107 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 108 static int intro_skipped = 0; /* indicated if we already have landed */
 109
 110 static const char *home_dir;
 111
 112 static int quit = 0;
 113
 114 int parse_args(int argc, char *argv[])
 115 {
 116         int i = 1;
 117
 118         while (argc > i) {
 119                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 120                         print_info("Usage: %s\n", argv[0]);
 121                         print_info(" -s --render-speed original | fast\n");
 122                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 123                         print_info("    --fps <fps>\n");
 124                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 125                         print_info(" -v --video-filter on | off\n");
 126                         print_info("        Set video filter.\n");
 127                         print_info(" -a --audio-filter on | off\n");
 128                         print_info("        Set audio filter.\n");
 129                         print_info(" -r --render original | opengl\n");
 130                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 131                         print_info(" -b --benson normal | half\n");
 132                         print_info("        Size of 'Benson' (control panel).\n");
 133                         print_info(" -m --multisampling <samples>\n");
 134                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 135                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 136                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 137                         print_info(" -i --skip-intro\n");
 138                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 139                         print_info("Debug options:\n");
 140                         print_info(" -o --debug-opengl\n");
 141                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 142                         print_info("    --debug-transparent\n");
 143                         print_info("        Draw all things half transparent.\n");
 144                         print_info("    --ctrl-c\n");
 145                         print_info("        Use CTRL+C to exit game (used for development)\n");
 146                         return -1;
 147                 } else
 148                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 149                         i++;
 150                         if (argc == i) {
 151 missing_parameter:
 152                                 print_info("Missing parameter, use '--help'!\n");
 153                                 return -1;
 154                         }
 155                         if (!strcmp(argv[i], "original"))
 156                                 config_amiga_speed = 1;
 157                         else
 158                         if (!strcmp(argv[i], "fast"))
 159                                 config_amiga_speed = 0;
 160                         else {
 161 illegal_parameter:
 162                                 print_info("Illegal parameter, use '--help'!\n");
 163                                 return -1;
 164                         }
 165                 } else
 166                 if (!strcmp(argv[i], "--fps")) {
 167                         i++;
 168                         if (argc == i)
 169                                 goto missing_parameter;
 170                         config_fps = atof(argv[i]);
 171                         if (config_fov <= 0.0)
 172                                 goto illegal_parameter;
 173                 } else
 174                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 175                         i++;
 176                         if (argc == i)
 177                                 goto missing_parameter;
 178                         if (!strcmp(argv[i], "on"))
 179                                 config_video_filter = 1;
 180                         else
 181                         if (!strcmp(argv[i], "off"))
 182                                 config_video_filter = 0;
 183                         else
 184                                 goto illegal_parameter;
 185                 } else
 186                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 187                         i++;
 188                         if (argc == i)
 189                                 goto missing_parameter;
 190                         if (!strcmp(argv[i], "on"))
 191                                 config_audio_filter = 1;
 192                         else
 193                         if (!strcmp(argv[i], "off"))
 194                                 config_audio_filter = 0;
 195                         else
 196                                 goto illegal_parameter;
 197                 } else
 198                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 199                         i++;
 200                         if (argc == i)
 201                                 goto missing_parameter;
 202                         if (!strcmp(argv[i], "original"))
 203                                 config_render = 0;
 204                         else
 205                         if (!strcmp(argv[i], "opengl"))
 206                                 config_render = 1;
 207                         else
 208                                 goto illegal_parameter;
 209                 } else
 210                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 211                         i++;
 212                         if (argc == i)
 213                                 goto missing_parameter;
 214                         if (!strcmp(argv[i], "normal"))
 215                                 config_benson_size = 1.0;
 216                         else
 217                         if (!strcmp(argv[i], "half")) {
 218                                 config_benson_size = 0.5;
 219                                 if (config_fov == FOV_NOVAGEN)
 220                                         config_fov = FOV_JOLLY;
 221                         } else
 222                                 goto illegal_parameter;
 223                 } else
 224                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 225                         i++;
 226                         if (argc == i)
 227                                 goto missing_parameter;
 228                         config_multisampling = atoi(argv[i]);
 229                 } else
 230                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 231                         i++;
 232                         if (argc == i)
 233                                 goto missing_parameter;
 234                         config_fov = atof(argv[i]);
 235                         if (config_fov < 1.0 || config_fov > 179.0)
 236                                 goto illegal_parameter;
 237                 } else
 238                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 239                         config_skip_intro = 1;
 240                 } else
 241                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 242                         config_debug_opengl = 1;
 243                 } else
 244                 if (!strcmp(argv[i], "--debug-transparent")) {
 245                         config_debug_transparent = 1;
 246                 } else
 247                 if (!strcmp(argv[i], "--ctrl-c")) {
 248                         config_ctrl_c = 1;
 249                 } else {
 250                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 251                         return -1;
 252                 }
 253                 i++;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void skip_intro(void)
 260 {
 261         int event;
 262         double render_delay = 0.0;
 263         double cycle_count;
 264
 265         if (intro_skipped)
 266                 return;
 267
 268         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 269         do {
 270                 /* render, if not delayed */
 271                 if (render_delay <= 0.0) {
 272                         cycle_count = 0;
 273                         do {
 274                                 cycle_count += execute_cpu(0, &event);
 275                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 276                         render_delay += (double)cycle_count / CPU_SPEED;
 277                 }
 278                 /* VBL */
 279                 execute_cpu(3, NULL);
 280                 /* count down render delay */
 281                 if (render_delay) {
 282                         render_delay -= 1.0 / (double)IRQ_RATE;
 283                         if (render_delay < 0.0)
 284                                 render_delay = 0.0;
 285                 }
 286         } while (event != STOP_AT_CLEAR_SCREEN1);
 287
 288         intro_skipped = 1;
 289 }
 290
 291 static void special_event(int event)
 292 {
 293         if (render_improved)
 294                 render_capture_event(event);
 295 }
 296
 297 static void main_loop(void)
 298 {
 299         double frame_step, frame_time = 0.0, frame_render = 1;
 300         int had_first_irq = 0;
 301         int render_improved_rc;
 302         static uint32_t current_time, last_time = 0, diff;
 303         int i, rc;
 304         int space, length;
 305         int cycle_count, event = STOP_AT_END;
 306         double render_delay = 0.0;
 307         uint32_t palette_address;
 308         uint16_t palette[16];
 309
 310         last_time = SDL_GetTicks();
 311
 312         /* render result on window */
 313         while (!quit) {
 314 #warning oder ganz anders: bevor landung machen wir amiga-rate als interpolation
 315                 /* if we are in interstellar fligt, we use 50 Hz */
 316                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 317                 /* else we use whatever frame rate the user wants */
 318                 if (render_capture_is_interstellar())
 319                         frame_step = vbl_duration * 50.0;
 320                 else
 321                         frame_step = vbl_duration * config_fps;
 322                 if (frame_step > 1.0)
 323                         frame_step = 1.0;
 324                 /* handle SDL events */
 325                 rc = event_sdl();
 326                 if (rc)
 327                         break;
 328
 329                 /* clear screen */
 330                 opengl_clear();
 331
 332                 /* initialize rendering */
 333                 debug_opengl = config_debug_opengl;
 334                 benson_size = config_benson_size;
 335                 render_legacy = (!config_render) || debug_opengl;
 336                 render_improved = config_render || debug_opengl;
 337                 if (!render_improved) {
 338                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 339                         render_capture_reset();
 340                 }
 341                 if (render_improved)
 342                         opengl_viewport_improved(debug_opengl, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 343                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 344                 /* amgia speed: don't render if we still delay */
 345                 /* non amiga speed: render if we need a new frame */
 346                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 347                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 348                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 349                 if (((frame_render && !config_amiga_speed)
 350                   || (config_amiga_speed && render_delay <= 0.0)
 351                   || event == STOP_AT_WAIT_INPUT)
 352                 && !(had_first_irq && help_view)) {
 353                         frame_render = 0;
 354                         /* start capturing for improved graphics */
 355                         if (render_improved)
 356                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 357
 358                         /* execute until the rendered image is ready (wait for VBL) */
 359                         cycle_count = 0;
 360                         do {
 361                                 cycle_count += execute_cpu(0, &event);
 362                                 /* handle special events */
 363                                 special_event(event);
 364                                 if (event == STOP_AT_CLEAR_SCREEN1)
 365                                         intro_skipped = 1;
 366                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 367                         /* stop capturing for improved graphics */
 368                         if (render_improved)
 369                                 render_capture_stop();
 370                         /* copy palette */
 371                         palette_address = mercenary_palette_view();
 372                         for (i = 0; i < 16; i++)
 373                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 374                         /* for amiga speed: set delay by the number of cycles */
 375                         if (config_amiga_speed)
 376                                 render_delay += (double)cycle_count / CPU_SPEED;
 377                 }
 378                 /* render improved graphics, interpolate, if required */
 379                 if (render_improved)
 380                         render_improved_rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time);
 381                 else
 382                         render_improved_rc = -1;
 383                 /* advance frame time, if we are not in help view  */
 384                 if (!(had_first_irq && help_view)) {
 385 //printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
 386                         frame_time += frame_step;
 387                         if (frame_time >= 1.0) {
 388                                 frame_time -= 1.0;
 389                                 frame_render = 1;
 390                         }
 391                 }
 392
 393                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 394                 if (had_first_irq) {
 395                         /* render game view without benson
 396                          * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 397                          */
 398                         if (render_legacy || render_improved_rc)
 399                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 400                 }
 401                 /* render benson + osd ontop of improved opengl rendering, if enabled */
 402                 if (render_improved && render_improved_rc == 0) {
 403                         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);
 404                         if (help_view)
 405                                 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);
 406                         if (osd_timer) {
 407                                 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);
 408                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 409                                         osd_timer = 0;
 410                         }
 411                 }
 412                 /* setup viewport for legacy image and render image, if enabled */
 413                 /* also render legacy, if render_improved failed due to not (yet) available items */
 414                 if (render_legacy || (render_improved && render_improved_rc)) {
 415                         opengl_viewport_legacy(debug_opengl);
 416                         opengl_blit_legacy(image, config_video_filter);
 417                         if (help_view)
 418                                 opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
 419                         if (osd_timer) {
 420                                 opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
 421                                 if (osd_timer - (int32_t)SDL_GetTicks() < 0)
 422                                         osd_timer = 0;
 423                         }
 424                 }
 425
 426                 /* at this point we are ready with our image, so we display */
 427                 swap_sdl();
 428                 /* measure frame rate */
 429                 framerate_measure();
 430
 431                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 432                 /* only do this, if we are not in help view */
 433                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 434                 if (!(had_first_irq && help_view)) {
 435                         current_time = SDL_GetTicks();
 436                         diff = current_time - last_time;
 437                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 438                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 439                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 440                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 441                         }
 442                         while (diff > 1000 / IRQ_RATE) {
 443                                 /* trigger and execute IRQ 3 = VBL */
 444                                 execute_cpu(3, NULL);
 445                                 had_first_irq = 1;
 446                                 /* transfer benson without game view
 447                                  * because we only got benson refreshed during VBL IRQ
 448                                  */
 449                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 450                                 /* render sound to sound buffer
 451                                  * buffer pointer read and write is atomic, so no locking required!
 452                                  */
 453                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 454                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 455 #ifdef DEBUG_SOUND_BUFFERING
 456                                         fprintf(stderr, "sound buffer overflow\n");
 457 #endif
 458                                         length = space;
 459                                 } else
 460                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 461 #ifdef DEBUG_SOUND_BUFFERING
 462                                 printf("can write %d, write %d\n", space, length);
 463                                 static int cnt = 0;
 464                                 int s;
 465                                 for (s = 0; s < length; s++) {
 466                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 467                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 468                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 469                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 470                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 471                                          cnt++;
 472                                 }
 473 #else
 474                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 475 #endif
 476                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 477                                 diff -= 1000 / IRQ_RATE;
 478                                 last_time += 1000 / IRQ_RATE;
 479
 480                                 /* count down render delay */
 481                                 if (render_delay) {
 482                                         render_delay -= 1.0 / (double)IRQ_RATE;
 483                                         if (render_delay < 0.0)
 484                                                 render_delay = 0.0;
 485                                 }
 486                         }
 487                 }
 488         }
 489 }
 490
 491 static uint16_t io_read(uint32_t address)
 492 {
 493         uint16_t value = 0xffff;
 494
 495         /* joystick and fire button */
 496         if (address == 0xbfe000 || address == 0xdff00c)
 497                 value &= emulate_joystick_read(address);
 498         /* keyboard */
 499         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 500                 value &= emulate_keyboard_read(address);
 501         /* diskette */
 502         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 503                 value &= emulate_disk_read(address);
 504
 505         return value;
 506 }
 507
 508 static void io_write(uint32_t address, uint16_t value)
 509 {
 510         /* dmacon and sound registers */
 511         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 512                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 513         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 514                 emulate_disk_write(address, value);
 515 }
 516
 517 /* two tracks with 0x1820 words of length */
 518 static uint8_t game_save[2][0x1820 << 1];
 519 static int last_track = 0;
 520
 521 /* game reads track with saved game */
 522 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 523 {
 524         if (length > sizeof(game_save[0])) {
 525                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 526                 return;
 527         }
 528
 529         /* if even track is selected, load game */
 530         if (!(track & 1)) {
 531                 char filename[256];
 532                 int gamesave_num = (track - 2) >> 1;
 533                 int got;
 534                 FILE *fp;
 535
 536                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 537 #if defined(_WIN32)
 538                 filename[0] = '\0';
 539 #else
 540                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 541                 mkdir(filename, 0777);
 542 #endif
 543                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 544                 fp = fopen(filename, "r");
 545                 if (!fp) {
 546 fail:
 547                         print_error("failed to load game from '%s'\n", filename);
 548                         goto copy;
 549                 }
 550                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 551                 fclose(fp);
 552                 if (got != 2)
 553                         goto fail;
 554         }
 555
 556 copy:
 557         /* copy track */
 558         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 559 }
 560
 561 /* game writes track with saved game */
 562 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 563 {
 564         /* skip sync info that is provided by game and only relevant for a real disk track */
 565         data += 0x200;
 566         length -= 0x200;
 567
 568         if (length != sizeof(game_save[0])) {
 569                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 570                 return;
 571         }
 572
 573         /* don't save if last track is the same, because disk is written on both sides with the same data */
 574         if (track == last_track) {
 575                 if (memcmp(memory + data, game_save[track & 1], length)) {
 576                         print_error("saving game data on other side of the disk is different, please fix!\n");
 577                 }
 578                 return;
 579         }
 580         last_track = track;
 581
 582         /* save game data */
 583         memcpy(game_save[track & 1], memory + data, length);
 584
 585         /* if done with saving */
 586         if ((track & 1)) {
 587                 char filename[256];
 588                 int gamesave_num = (track - 2) >> 1;
 589                 int wrote;
 590                 FILE *fp;
 591
 592 #if defined(_WIN32)
 593                 filename[0] = '\0';
 594 #else
 595                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 596                 mkdir(filename, 0777);
 597 #endif
 598                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 599                 fp = fopen(filename, "w");
 600                 if (!fp) {
 601 fail:
 602                         print_error("failed to save game to '%s'\n", filename);
 603                         return;
 604                 }
 605                 print_info("Game state saved to '%s'\n", filename);
 606                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 607                 fclose(fp);
 608                 if (wrote != 2)
 609                         goto fail;
 610         }
 611 }
 612
 613 static void osd_info(const char *param, const char *value)
 614 {
 615         char line[41] = "                                        ";
 616
 617         if (param[0]) {
 618                 strncpy(line + 21 - strlen(param), param, strlen(param));
 619                 line[22] = ':';
 620         }
 621         if (strlen(value) > 15) {
 622                 print_error("string too long\n");
 623                 return;
 624         }
 625         strncpy(line + 25, value, strlen(value));
 626         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 627         osd_timer = SDL_GetTicks() + 2500;
 628 }
 629
 630 static int shift = 0, ctrl = 0;
 631
 632 static void keyboard_sdl(int down, SDL_Keycode sym)
 633 {
 634         switch (sym) {
 635         case SDLK_LCTRL:
 636         case SDLK_RCTRL:
 637                 ctrl = down;
 638                 break;
 639         }
 640
 641         if (ctrl && down) {
 642                 switch (sym) {
 643                 case SDLK_h:
 644                         help_view ^= 1;
 645                         break;
 646                 case SDLK_v:
 647                         config_video_filter ^= 1;
 648                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 649                         break;
 650                 case SDLK_a:
 651                         config_audio_filter ^= 1;
 652                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 653                         break;
 654                 case SDLK_s:
 655                         config_amiga_speed ^= 1;
 656                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 657                         break;
 658                 case SDLK_r:
 659                         config_render ^= 1;
 660                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 661                         break;
 662                 case SDLK_b:
 663                         if (!config_render) {
 664                                 osd_info("", "not applicable");
 665                                 break;
 666                         }
 667                         if (config_benson_size == 0.5) {
 668                                 config_benson_size = 1.0;
 669                                 config_fov = FOV_NOVAGEN;
 670                         } else {
 671                                 config_benson_size = 0.5;
 672                                 config_fov = FOV_JOLLY;
 673                         }
 674                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 675                         break;
 676                 case SDLK_i:
 677                         if (!intro_skipped)
 678                                 skip_intro();
 679                         else
 680                                 osd_info("", "not applicable");
 681                         break;
 682                 case SDLK_c:
 683                         if (config_ctrl_c)
 684                                 quit = 1;
 685                         break;
 686                 case SDLK_KP_PLUS:
 687                         if (config_fov / 1.2 >= FOV_MIN)
 688                                 config_fov /= 1.2;
 689                         disp_fov:
 690                         {
 691                                 char text[16];
 692                                 sprintf(text, "%.2f", config_fov);
 693                                 osd_info("FOV", text);
 694                         }
 695                         break;
 696                 case SDLK_KP_MINUS:
 697                         if (config_fov * 1.2 <= FOV_MAX)
 698                                 config_fov *= 1.2;
 699                         goto disp_fov;
 700                 }
 701                 /* do not pass keys to game while holding CTRL */
 702                 return;
 703         }
 704
 705         if (sym == SDLK_PAUSE && down)
 706                 help_view ^= 1;
 707
 708         /* in help view we don't need to forward keypresses */
 709         if (help_view)
 710                 return;
 711
 712         switch (sym) {
 713         case SDLK_LSHIFT:
 714                 set_key("LSH", down);
 715                 shift = down;
 716                 break;
 717         case SDLK_RSHIFT:
 718                 set_key("RSH", down);
 719                 shift = down;
 720                 break;
 721         case SDLK_LEFT:
 722                 if (shift && down) {
 723                         set_key("LF", down);
 724                         set_joystick(-1, -1, -1, -1, -1);
 725                         break;
 726                 }
 727                 set_key("LF", 0);
 728                 set_joystick(down, -1, -1, -1, -1);
 729                 break;
 730         case SDLK_RIGHT:
 731                 if (shift && down) {
 732                         set_key("RT", down);
 733                         set_joystick(-1, -1, -1, -1, -1);
 734                         break;
 735                 }
 736                 set_key("RT", 0);
 737                 set_joystick(-1, down, -1, -1, -1);
 738                 break;
 739         case SDLK_UP:
 740                 if (shift && down) {
 741                         set_key("UP", down);
 742                         set_joystick(-1, -1, -1, -1, -1);
 743                         break;
 744                 }
 745                 set_key("UP", 0);
 746                 set_joystick(-1, -1, down, -1, -1);
 747                 break;
 748         case SDLK_DOWN:
 749                 if (shift && down) {
 750                         set_key("DN", down);
 751                         set_joystick(-1, -1, -1, -1, -1);
 752                         break;
 753                 }
 754                 set_key("DN", 0);
 755                 set_joystick(-1, -1, -1, down, -1);
 756                 break;
 757         case SDLK_END:
 758                 set_joystick(-1, -1, -1, -1, down);
 759                 break;
 760
 761         case SDLK_a: set_key("A", down); break;
 762         case SDLK_b: set_key("B", down); break;
 763         case SDLK_c: set_key("C", down); break;
 764         case SDLK_d: set_key("D", down); break;
 765         case SDLK_e: set_key("E", down); break;
 766         case SDLK_f: set_key("F", down); break;
 767         case SDLK_g: set_key("G", down); break;
 768         case SDLK_h: set_key("H", down); break;
 769         case SDLK_i: set_key("I", down); break;
 770         case SDLK_j: set_key("J", down); break;
 771         case SDLK_k: set_key("K", down); break;
 772         case SDLK_l: set_key("L", down); break;
 773         case SDLK_m: set_key("M", down); break;
 774         case SDLK_n: set_key("N", down); break;
 775         case SDLK_o: set_key("O", down); break;
 776         case SDLK_p: set_key("P", down); break;
 777         case SDLK_q: set_key("Q", down); break;
 778         case SDLK_r: set_key("R", down); break;
 779         case SDLK_s: set_key("S", down); break;
 780         case SDLK_t: set_key("T", down); break;
 781         case SDLK_u: set_key("U", down); break;
 782         case SDLK_v: set_key("V", down); break;
 783         case SDLK_w: set_key("W", down); break;
 784         case SDLK_x: set_key("X", down); break;
 785         case SDLK_y: set_key("Y", down); break;
 786         case SDLK_z: set_key("Z", down); break;
 787
 788         case SDLK_0: set_key("0", down); break;
 789         case SDLK_1: set_key("1", down); break;
 790         case SDLK_2: set_key("2", down); break;
 791         case SDLK_3: set_key("3", down); break;
 792         case SDLK_4: set_key("4", down); break;
 793         case SDLK_5: set_key("5", down); break;
 794         case SDLK_6: set_key("6", down); break;
 795         case SDLK_7: set_key("7", down); break;
 796         case SDLK_8: set_key("8", down); break;
 797         case SDLK_9: set_key("9", down); break;
 798
 799         case SDLK_KP_0: set_key("NP0", down); break;
 800         case SDLK_KP_1: set_key("NP1", down); break;
 801         case SDLK_KP_2: set_key("NP2", down); break;
 802         case SDLK_KP_3: set_key("NP3", down); break;
 803         case SDLK_KP_4: set_key("NP4", down); break;
 804         case SDLK_KP_5: set_key("NP5", down); break;
 805         case SDLK_KP_6: set_key("NP6", down); break;
 806         case SDLK_KP_7: set_key("NP7", down); break;
 807         case SDLK_KP_8: set_key("NP8", down); break;
 808         case SDLK_KP_9: set_key("NP9", down); break;
 809         case SDLK_KP_DIVIDE: set_key("NPDIV", down); break;
 810         case SDLK_KP_MULTIPLY: set_key("NPMUL", down); break;
 811         case SDLK_KP_MINUS: set_key("NPSUB", down); break;
 812         case SDLK_KP_PLUS: set_key("NPADD", down); break;
 813         case SDLK_KP_PERIOD: set_key("NPDEL", down); break;
 814         // NPLPAREN and NPRPAREN are not emulated
 815
 816         case SDLK_F1: set_key("F1", down); break;
 817         case SDLK_F2: set_key("F2", down); break;
 818         case SDLK_F3: set_key("F3", down); break;
 819         case SDLK_F4: set_key("F4", down); break;
 820         case SDLK_F5: set_key("F5", down); break;
 821         case SDLK_F6: set_key("F6", down); break;
 822         case SDLK_F7: set_key("F7", down); break;
 823         case SDLK_F8: set_key("F8", down); break;
 824         case SDLK_F9: set_key("F9", down); break;
 825         case SDLK_F10: set_key("F10", down); break;
 826
 827         case SDLK_SPACE: set_key("SPC", down); break;
 828         case SDLK_BACKSPACE: set_key("BS", down); break;
 829         case SDLK_TAB: set_key("TAB", down); break;
 830         case SDLK_KP_ENTER: set_key("ENT", down); break;
 831         case SDLK_RETURN: set_key("RET", down); break;
 832         case SDLK_ESCAPE: set_key("ESC", down); break;
 833         case SDLK_DELETE: set_key("DEL", down); break;
 834         case SDLK_INSERT: set_key("HELP", down); break;
 835
 836         }
 837 }
 838
 839 void audio_sdl(float *data, int length)
 840 {
 841         int fill, s;
 842
 843         /* read sound from sound buffer
 844          * buffer pointer read and write is atomic, so no locking required!
 845          */
 846         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 847         if (fill < length) {
 848 #ifdef DEBUG_SOUND_BUFFERING
 849                 fprintf(stderr, "sound buffer underrun\n");
 850 #endif
 851                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 852                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 853         }
 854         for (s = 0; s < length; s++) {
 855                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 856                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 857         }
 858 #ifdef DEBUG_SOUND_BUFFERING
 859         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 860 #endif
 861         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 862 }
 863
 864 void sound_irq(void)
 865 {
 866         /* trigger and execute IRQ 4 = sound */
 867         execute_cpu(4, NULL);
 868 }
 869
 870 int main(int argc, char *argv[])
 871 {
 872         int rc;
 873         int sdl_sound_chunk;
 874
 875         home_dir = getenv("HOME");
 876         if (!home_dir)
 877                 home_dir = "";
 878
 879         rc = parse_args(argc, argv);
 880         if (rc)
 881                 return 0;
 882
 883         /* allocate image */
 884         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 885         if (!image) {
 886                 print_error("Failed to allocate image buffer\n");
 887                 goto done;
 888         }
 889
 890         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 891                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 892                 goto done;
 893         }
 894         if ((1000 % IRQ_RATE)) {
 895                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 896                 goto done;
 897         }
 898
 899         /* calculate SDL chunk size for audio
 900          * it must be a power of two, but not more than the chunk size for each IRQ!
 901          */
 902         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 903                 ;
 904         sdl_sound_chunk >>= 1;
 905 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 906
 907         /* allocate sound buffers */
 908         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 909         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 910         if (!sound_buffer) {
 911                 print_error("Failed to allocate image buffer\n");
 912                 goto done;
 913         }
 914
 915         /* allocate memory */
 916         memory = calloc(MEMORY_SIZE, 1);
 917         if (!memory) {
 918                 print_error("Failed to allocate cpu's memory\n");
 919                 goto done;
 920         }
 921         stop_event = calloc(MEMORY_SIZE, 1);
 922         if (!stop_event) {
 923                 print_error("Failed to allocate cpu's stop_event memory\n");
 924                 goto done;
 925         }
 926         chipreg = calloc(IOSIZE, 1);
 927         if (!chipreg) {
 928                 print_error("Failed to allocate chip register\n");
 929                 goto done;
 930         }
 931
 932         /* init cpu code */
 933         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 934
 935         /* init disk emulation */
 936         disk_init(disk_read, disk_write);
 937
 938         /* load binary */
 939         mercenary_load();
 940
 941         /* patch some stuff */
 942         mercenary_patch();
 943
 944         /* init SDL and OpenGL */
 945         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);
 946         if (rc < 0)
 947                 goto done;
 948         rc = init_opengl((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 949         if (rc < 0)
 950                 goto done;
 951         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 952
 953         /* init osd */
 954         rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 955         if (rc < 0)
 956                 goto done;
 957         rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
 958         if (rc < 0)
 959                 goto done;
 960         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 961         if (!help_osd)
 962                 goto done;
 963         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 964         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 965                 "Emulation:\n"
 966                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 967                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 968                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 969                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 970                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 971                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 972                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 973                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 974                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 975                 "\n"
 976                 "Answer to a Question:\n"
 977                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 978                 "\n"
 979                 "Walking / Driving / Flying:\n"
 980                 "        Use cursor keys as joystick, to move player / craft.\n"
 981                 "        Press `R' for running, 'W' for walking speed.\n"
 982                 "        Press `B' to board, `L' to leave.\n"
 983                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 984                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 985                 "        Press `SPACE' to stop craft.\n"
 986                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
 987                 "        Press `T' for turbo on certain craft.\n"
 988                 "        Press `END' as joystick's fire button.\n"
 989                 "\n"
 990                 "Elevator:\n"
 991                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
 992                 "\n"
 993                 "Inside a transporter:\n"
 994                 "        Press `1'...`0' to select destination.\n"
 995                 "\n"
 996                 "Items:\n"
 997                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
 998                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
 999                 "        Press `NUMPAD Enter' to select certain items.\n"
1000                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1001                 "        Press `NUMPAD *' to read entry\n"
1002                 "Saving / Loading / Pause:\n"
1003                 "        Press `INSERT' to loading and saving options.\n"
1004                 "        Press `ENTER' to pause game, other key to continue.\n"
1005                 ,HELP_ALPHA, 1, 2, 5, 0);
1006         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1007         if (!info_osd)
1008                 goto done;
1009
1010         /* init audio */
1011         sound_init(SOUND_SAMPLERATE, sound_irq);
1012
1013         /* start cpu */
1014         reset_cpu();
1015
1016         if (config_skip_intro)
1017                 skip_intro();
1018
1019         /* run game */
1020         main_loop();
1021
1022 done:
1023         exit_opengl();
1024         exit_sdl();
1025
1026         if (chipreg)
1027                 free(chipreg);
1028         if (stop_event)
1029                 free(stop_event);
1030         if (memory)
1031                 free(memory);
1032         if (sound_buffer)
1033                 free(sound_buffer);
1034         if (image)
1035                 free(image);
1036         if (help_osd)
1037                 free(help_osd);
1038         if (info_osd)
1039                 free(info_osd);
1040
1041         return 0;
1042 }
1043