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 #ifdef HAVE_OVR
  28 #include "../libovr/ovr.h"
  29 #endif
  30 #include "../libsdl/opengl.h"
  31 #include "../libsdl/print.h"
  32 #include "../libcpu/m68k.h"
  33 #include "../libcpu/execute.h"
  34 #include "../libframerate/framerate.h"
  35 #include "../libvideo/video.h"
  36 #include "../libsound/sound.h"
  37 #include "../libjoystick/joystick.h"
  38 #include "../libkeyboard/keyboard.h"
  39 #include "../libdisk/disk.h"
  40 #include "../libtext/text.h"
  41 #include "mercenary.h"
  42 #include "render.h"
  43
  44 #define FOV_MIN         10.0
  45 #define FOV_NOVAGEN     64.0
  46 #define FOV_JOLLY       80.0
  47 #define FOV_MAX         170.0
  48
  49 static int config_ctrl_c = 0;
  50 static int config_amiga_speed = 0; /* fast speed */
  51 static double config_fps = 16.0;
  52 #if !defined(_WIN32)
  53 static const char *config_gamesave_dir = ".mercenary";
  54 #endif
  55 static int config_video_filter = 1;
  56 static int config_audio_filter = 1;
  57 static int config_render = 1; /* opengl render */
  58 static int config_skip_intro = 0;
  59 static int config_multisampling = 16;
  60 static double config_fov = FOV_NOVAGEN;
  61 static double config_monitor_distance = 31.5; /* inch */
  62 static double config_benson_size = 1.0;
  63 static int config_debug_transparent = 0;
  64 static int config_debug_opengl = 0;
  65 /* render improvements */
  66 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  67
  68 #define CPU_SPEED       7093790.0;
  69
  70 #define SOUND_SAMPLERATE 48000
  71 /* - game IRQ rate
  72  * - must be used for sound rendering chunk
  73  */
  74 #define IRQ_RATE        50
  75 /* numbe of buffer chunks to dejitter:
  76  * - SDL render interval
  77  * - sound rendering interval
  78  * - sound card interval
  79  * 4 should be minimum, if video rate is >=50 Hz
  80  */
  81 #define SOUND_CHUNKS    4
  82
  83 /* test sound to check if buffer does not overflow / underrun */
  84 //#define DEBUG_SOUND_BUFFERING
  85
  86 #define IOSIZE          0x1000 /* bytes in io space */
  87 #define MEMORY_SIZE     0x80000
  88 static uint8_t *memory = NULL;
  89 static uint8_t *stop_event = NULL;
  90 static uint8_t *image = NULL;
  91 static uint8_t *help_osd = NULL;
  92 static uint8_t *info_osd = NULL;
  93 static int help_view = 1;
  94 static int32_t osd_timer = 0;
  95 #ifdef HAVE_OVR
  96 #define SCREEN_WIDTH    800
  97 #define SCREEN_HEIGHT   800
  98 #else
  99 #define SCREEN_WIDTH    (320*3)
 100 #define SCREEN_HEIGHT   (200*3)
 101 #endif
 102 #define IMAGE_WIDTH     320
 103 #define IMAGE_HEIGHT    200
 104 #define BENSON_AT_LINE  136
 105 #define IMAGE_DIWSTART  0x2c
 106 #define HELP_ALPHA      0xd0
 107 #define OSD_WIDTH       320
 108 #define OSD_HEIGHT      16
 109 static uint16_t *chipreg = NULL;
 110 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 111 static int sound_buffer_size; /* buffer sample size */
 112 static int sound_buffer_writep; /* write pointer at buffer */
 113 static int sound_buffer_readp; /* read pointer at buffer */
 114 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 115 static double benson_size; /* render size of benson */
 116 static int render_legacy = 0; /* render original amiga screen, if set */
 117 static int render_improved = 0; /* render improved image, if set */
 118 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 119 static int intro_skipped = 0; /* indicated if we already have landed */
 120
 121 static const char *home_dir;
 122
 123 static int quit = 0;
 124
 125 int parse_args(int argc, char *argv[])
 126 {
 127         int i = 1;
 128
 129         while (argc > i) {
 130                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 131                         print_info("Usage: %s\n", argv[0]);
 132                         print_info(" -s --render-speed original | fast\n");
 133                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 134                         print_info("    --fps <fps>\n");
 135                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 136                         print_info(" -v --video-filter on | off\n");
 137                         print_info("        Set video filter.\n");
 138                         print_info(" -a --audio-filter on | off\n");
 139                         print_info("        Set audio filter.\n");
 140                         print_info(" -r --render original | opengl\n");
 141                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 142                         print_info(" -b --benson normal | half\n");
 143                         print_info("        Size of 'Benson' (control panel).\n");
 144                         print_info(" -m --multisampling <samples>\n");
 145                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 146                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 147                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 148                         print_info(" -i --skip-intro\n");
 149                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 150                         print_info("Debug options:\n");
 151                         print_info(" -o --debug-opengl\n");
 152                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 153                         print_info("    --debug-transparent\n");
 154                         print_info("        Draw all things half transparent.\n");
 155                         print_info("    --ctrl-c\n");
 156                         print_info("        Use CTRL+C to exit game (used for development)\n");
 157                         return -1;
 158                 } else
 159                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 160                         i++;
 161                         if (argc == i) {
 162 missing_parameter:
 163                                 print_info("Missing parameter, use '--help'!\n");
 164                                 return -1;
 165                         }
 166                         if (!strcmp(argv[i], "original"))
 167                                 config_amiga_speed = 1;
 168                         else
 169                         if (!strcmp(argv[i], "fast"))
 170                                 config_amiga_speed = 0;
 171                         else {
 172 illegal_parameter:
 173                                 print_info("Illegal parameter, use '--help'!\n");
 174                                 return -1;
 175                         }
 176                 } else
 177                 if (!strcmp(argv[i], "--fps")) {
 178                         i++;
 179                         if (argc == i)
 180                                 goto missing_parameter;
 181                         config_fps = atof(argv[i]);
 182                         if (config_fov <= 0.0)
 183                                 goto illegal_parameter;
 184                 } else
 185                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 186                         i++;
 187                         if (argc == i)
 188                                 goto missing_parameter;
 189                         if (!strcmp(argv[i], "on"))
 190                                 config_video_filter = 1;
 191                         else
 192                         if (!strcmp(argv[i], "off"))
 193                                 config_video_filter = 0;
 194                         else
 195                                 goto illegal_parameter;
 196                 } else
 197                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 198                         i++;
 199                         if (argc == i)
 200                                 goto missing_parameter;
 201                         if (!strcmp(argv[i], "on"))
 202                                 config_audio_filter = 1;
 203                         else
 204                         if (!strcmp(argv[i], "off"))
 205                                 config_audio_filter = 0;
 206                         else
 207                                 goto illegal_parameter;
 208                 } else
 209                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 210                         i++;
 211                         if (argc == i)
 212                                 goto missing_parameter;
 213                         if (!strcmp(argv[i], "original"))
 214                                 config_render = 0;
 215                         else
 216                         if (!strcmp(argv[i], "opengl"))
 217                                 config_render = 1;
 218                         else
 219                                 goto illegal_parameter;
 220                 } else
 221                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 222                         i++;
 223                         if (argc == i)
 224                                 goto missing_parameter;
 225                         if (!strcmp(argv[i], "normal"))
 226                                 config_benson_size = 1.0;
 227                         else
 228                         if (!strcmp(argv[i], "half")) {
 229                                 config_benson_size = 0.5;
 230                                 if (config_fov == FOV_NOVAGEN)
 231                                         config_fov = FOV_JOLLY;
 232                         } else
 233                                 goto illegal_parameter;
 234                 } else
 235                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 236                         i++;
 237                         if (argc == i)
 238                                 goto missing_parameter;
 239                         config_multisampling = atoi(argv[i]);
 240                 } else
 241                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 242                         i++;
 243                         if (argc == i)
 244                                 goto missing_parameter;
 245                         config_fov = atof(argv[i]);
 246                         if (config_fov < 1.0 || config_fov > 179.0)
 247                                 goto illegal_parameter;
 248                 } else
 249                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 250                         config_skip_intro = 1;
 251                 } else
 252                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 253                         config_debug_opengl = 1;
 254                 } else
 255                 if (!strcmp(argv[i], "--debug-transparent")) {
 256                         config_debug_transparent = 1;
 257                 } else
 258                 if (!strcmp(argv[i], "--ctrl-c")) {
 259                         config_ctrl_c = 1;
 260                 } else {
 261                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 262                         return -1;
 263                 }
 264                 i++;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static void skip_intro(void)
 271 {
 272         int event;
 273         double render_delay = 0.0;
 274         double cycle_count;
 275
 276         if (intro_skipped)
 277                 return;
 278
 279         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 280         do {
 281                 /* render, if not delayed */
 282                 if (render_delay <= 0.0) {
 283                         cycle_count = 0;
 284                         do {
 285                                 cycle_count += execute_cpu(0, &event);
 286                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 287                         render_delay += (double)cycle_count / CPU_SPEED;
 288                 }
 289                 /* VBL */
 290                 execute_cpu(3, NULL);
 291                 /* count down render delay */
 292                 if (render_delay) {
 293                         render_delay -= 1.0 / (double)IRQ_RATE;
 294                         if (render_delay < 0.0)
 295                                 render_delay = 0.0;
 296                 }
 297         } while (event != STOP_AT_CLEAR_SCREEN1);
 298
 299         intro_skipped = 1;
 300 }
 301
 302 static void special_event(int event)
 303 {
 304         if (render_improved)
 305                 render_capture_event(event);
 306 }
 307
 308 static void main_loop(void)
 309 {
 310         double frame_step, frame_time = 0.0, frame_render = 1;
 311         int had_first_irq = 0;
 312         static uint32_t current_time, last_time = 0, diff;
 313         int i, rc;
 314         int space, length;
 315         int cycle_count, event = STOP_AT_END;
 316         double render_delay = 0.0;
 317         uint32_t palette_address;
 318         uint16_t palette[16];
 319         int eye;
 320
 321         last_time = ticks_sdl();
 322
 323         /* render result on window */
 324         while (!quit) {
 325                 /* if we are in interstellar fligt, we use 50 Hz */
 326                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 327                 /* else we use whatever frame rate the user wants */
 328                 if (render_capture_is_interstellar())
 329                         frame_step = vbl_duration * 50.0;
 330                 else if (!intro_skipped)
 331                         frame_step = vbl_duration * 10.0;
 332                 else
 333                         frame_step = vbl_duration * config_fps;
 334                 if (frame_step > 1.0)
 335                         frame_step = 1.0;
 336                 /* handle SDL events */
 337                 rc = event_sdl();
 338                 if (rc)
 339                         break;
 340
 341                 /* initialize rendering */
 342                 debug_opengl = config_debug_opengl;
 343                 benson_size = config_benson_size;
 344                 render_legacy = (!config_render) || debug_opengl;
 345                 render_improved = config_render || debug_opengl;
 346                 if (!render_improved) {
 347                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 348                         render_capture_reset();
 349                 }
 350                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 351                 /* amgia speed: don't render if we still delay */
 352                 /* non amiga speed: render if we need a new frame */
 353                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 354                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 355                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 356                 if (((frame_render && !config_amiga_speed)
 357                   || (config_amiga_speed && render_delay <= 0.0)
 358                   || event == STOP_AT_WAIT_INPUT)
 359                 && !(had_first_irq && help_view)) {
 360                         frame_render = 0;
 361                         /* start capturing for improved graphics */
 362                         if (render_improved)
 363                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 364
 365                         /* execute until the rendered image is ready (wait for VBL) */
 366                         cycle_count = 0;
 367                         do {
 368                                 cycle_count += execute_cpu(0, &event);
 369                                 /* handle special events */
 370                                 special_event(event);
 371                                 if (event == STOP_AT_CLEAR_SCREEN1)
 372                                         intro_skipped = 1;
 373                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 374                         /* stop capturing for improved graphics */
 375                         if (render_improved)
 376                                 render_capture_stop();
 377                         /* copy palette */
 378                         palette_address = mercenary_palette_view();
 379                         for (i = 0; i < 16; i++)
 380                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 381                         /* for amiga speed: set delay by the number of cycles */
 382                         if (config_amiga_speed)
 383                                 render_delay += (double)cycle_count / CPU_SPEED;
 384                 }
 385
 386                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 387 #ifdef HAVE_OVR
 388                 begin_render_ovr();
 389                 for (eye = 0; eye < 2; eye++) {
 390                         /* viewport and frustum is set here */
 391                         begin_render_ovr_eye(eye);
 392 #else
 393                 eye = 0;
 394                 {
 395 #endif
 396                         /* clear screen */
 397 #ifdef HAVE_OVR
 398                         opengl_clear(1);
 399 #else
 400                         opengl_clear(0);
 401 #endif
 402                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 403                         if (render_improved) {
 404 #ifndef HAVE_OVR
 405                                 /* viewport and frustum is set here */
 406                                 opengl_viewport((debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 407 #endif
 408                                 /* render improved graphics, interpolate, if required,
 409                                  * if no item list is available, for legacy rendering
 410                                  */
 411 #ifdef HAVE_OVR
 412                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 413 #else
 414                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 415 #endif
 416                                 if (rc)
 417                                         goto goto_legacy;
 418                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 1, config_fov, config_monitor_distance, benson_size);
 419                                 if (help_view)
 420                                         opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 1.0, 1.0, 0.0, 0.0);
 421                                 if (osd_timer) {
 422                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, benson_size, 0.5, 0.04, 0.5, -0.95);
 423                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 424                                                 osd_timer = 0;
 425                                 }
 426                         }
 427                         /* setup viewport for legacy image and render image, if enabled */
 428                         /* also render legacy, if render_improved failed due to not (yet) available items */
 429                         if (render_legacy) {
 430                                 goto_legacy:
 431                                 /* render game view without benson
 432                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 433                                  */
 434                                 if (had_first_irq)
 435                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 436 #ifndef HAVE_OVR
 437                                 /* viewport and frustum is set here */
 438                                 opengl_viewport((debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 439 #endif
 440                                 opengl_blit_image(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, 0, config_fov, config_monitor_distance, 1.0);
 441                                 if (help_view)
 442                                         opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 1.0, 1.0, 0.0, 0.0);
 443                                 if (osd_timer) {
 444                                         opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, config_monitor_distance, 1.0, 0.5, 0.04, 0.5, -0.95);
 445                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 446                                                 osd_timer = 0;
 447                                 }
 448                         }
 449 #ifdef HAVE_OVR
 450                         end_render_ovr_eye(eye);
 451                 }
 452                 /* at this point we are ready with our image, so we display */
 453                 end_render_ovr();
 454                 render_mirror_ovr(SCREEN_WIDTH, SCREEN_HEIGHT);
 455 #else
 456                 }
 457 #endif
 458                 swap_sdl();
 459
 460                 /* advance frame time, if we are not in help view  */
 461                 if (!(had_first_irq && help_view)) {
 462                         frame_time += frame_step;
 463                         if (frame_time >= 1.0) {
 464                                 frame_time -= 1.0;
 465                                 frame_render = 1;
 466                         }
 467                 }
 468
 469                 /* measure frame rate */
 470                 framerate_measure();
 471
 472                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 473                 /* only do this, if we are not in help view */
 474                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 475                 if (!(had_first_irq && help_view)) {
 476                         current_time = ticks_sdl();
 477                         diff = current_time - last_time;
 478                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 479                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 480                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 481                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 482                         }
 483                         while (diff > 1000 / IRQ_RATE) {
 484                                 /* trigger and execute IRQ 3 = VBL */
 485                                 execute_cpu(3, NULL);
 486                                 had_first_irq = 1;
 487                                 /* transfer benson without game view
 488                                  * because we only got benson refreshed during VBL IRQ
 489                                  */
 490                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 491                                 /* render sound to sound buffer
 492                                  * buffer pointer read and write is atomic, so no locking required!
 493                                  */
 494                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 495                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 496 #ifdef DEBUG_SOUND_BUFFERING
 497                                         fprintf(stderr, "sound buffer overflow\n");
 498 #endif
 499                                         length = space;
 500                                 } else
 501                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 502 #ifdef DEBUG_SOUND_BUFFERING
 503                                 printf("can write %d, write %d\n", space, length);
 504                                 static int cnt = 0;
 505                                 int s;
 506                                 for (s = 0; s < length; s++) {
 507                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 508                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 509                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 510                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 511                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 512                                          cnt++;
 513                                 }
 514 #else
 515                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 516 #endif
 517                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 518                                 diff -= 1000 / IRQ_RATE;
 519                                 last_time += 1000 / IRQ_RATE;
 520
 521                                 /* count down render delay */
 522                                 if (render_delay) {
 523                                         render_delay -= 1.0 / (double)IRQ_RATE;
 524                                         if (render_delay < 0.0)
 525                                                 render_delay = 0.0;
 526                                 }
 527                         }
 528                 }
 529         }
 530 }
 531
 532 static uint16_t io_read(uint32_t address)
 533 {
 534         uint16_t value = 0xffff;
 535
 536         /* joystick and fire button */
 537         if (address == 0xbfe000 || address == 0xdff00c)
 538                 value &= emulate_joystick_read(address);
 539         /* keyboard */
 540         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 541                 value &= emulate_keyboard_read(address);
 542         /* diskette */
 543         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 544                 value &= emulate_disk_read(address);
 545
 546         return value;
 547 }
 548
 549 static void io_write(uint32_t address, uint16_t value)
 550 {
 551         /* dmacon and sound registers */
 552         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 553                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 554         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 555                 emulate_disk_write(address, value);
 556 }
 557
 558 /* two tracks with 0x1820 words of length */
 559 static uint8_t game_save[2][0x1820 << 1];
 560 static int last_track = 0;
 561
 562 /* game reads track with saved game */
 563 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 564 {
 565         if (length > sizeof(game_save[0])) {
 566                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 567                 return;
 568         }
 569
 570         /* if even track is selected, load game */
 571         if (!(track & 1)) {
 572                 char filename[256];
 573                 int gamesave_num = (track - 2) >> 1;
 574                 int got;
 575                 FILE *fp;
 576
 577                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 578 #if defined(_WIN32)
 579                 filename[0] = '\0';
 580 #else
 581                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 582                 mkdir(filename, 0777);
 583 #endif
 584                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 585                 fp = fopen(filename, "r");
 586                 if (!fp) {
 587 fail:
 588                         print_info("failed to load game from '%s'\n", filename);
 589                         goto copy;
 590                 }
 591                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 592                 fclose(fp);
 593                 if (got != 2)
 594                         goto fail;
 595         }
 596
 597 copy:
 598         /* copy track */
 599         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 600 }
 601
 602 /* game writes track with saved game */
 603 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 604 {
 605         /* skip sync info that is provided by game and only relevant for a real disk track */
 606         data += 0x200;
 607         length -= 0x200;
 608
 609         if (length != sizeof(game_save[0])) {
 610                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 611                 return;
 612         }
 613
 614         /* don't save if last track is the same, because disk is written on both sides with the same data */
 615         if (track == last_track) {
 616                 if (memcmp(memory + data, game_save[track & 1], length)) {
 617                         print_error("saving game data on other side of the disk is different, please fix!\n");
 618                 }
 619                 return;
 620         }
 621         last_track = track;
 622
 623         /* save game data */
 624         memcpy(game_save[track & 1], memory + data, length);
 625
 626         /* if done with saving */
 627         if ((track & 1)) {
 628                 char filename[256];
 629                 int gamesave_num = (track - 2) >> 1;
 630                 int wrote;
 631                 FILE *fp;
 632
 633 #if defined(_WIN32)
 634                 filename[0] = '\0';
 635 #else
 636                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 637                 mkdir(filename, 0777);
 638 #endif
 639                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 640                 fp = fopen(filename, "w");
 641                 if (!fp) {
 642 fail:
 643                         print_error("failed to save game to '%s'\n", filename);
 644                         return;
 645                 }
 646                 print_info("Game state saved to '%s'\n", filename);
 647                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 648                 fclose(fp);
 649                 if (wrote != 2)
 650                         goto fail;
 651         }
 652 }
 653
 654 static void osd_info(const char *param, const char *value)
 655 {
 656         char line[41] = "                                        ";
 657
 658         if (param[0]) {
 659                 strncpy(line + 21 - strlen(param), param, strlen(param));
 660                 line[22] = ':';
 661         }
 662         if (strlen(value) > 15) {
 663                 print_error("string too long\n");
 664                 return;
 665         }
 666         strncpy(line + 25, value, strlen(value));
 667         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 668         osd_timer = ticks_sdl() + 2500;
 669 }
 670
 671 static int shift = 0, ctrl = 0;
 672
 673 static void keyboard_sdl(int down, enum keycode keycode)
 674 {
 675         switch (keycode) {
 676         case KEYCODE_LCTRL:
 677         case KEYCODE_RCTRL:
 678                 ctrl = down;
 679                 break;
 680         default: break;
 681         }
 682
 683         if (ctrl && down) {
 684                 switch (keycode) {
 685                 case KEYCODE_h:
 686                         help_view ^= 1;
 687                         break;
 688                 case KEYCODE_v:
 689                         config_video_filter ^= 1;
 690                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 691                         break;
 692                 case KEYCODE_a:
 693                         config_audio_filter ^= 1;
 694                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 695                         break;
 696                 case KEYCODE_s:
 697                         config_amiga_speed ^= 1;
 698                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 699                         break;
 700                 case KEYCODE_r:
 701                         config_render ^= 1;
 702                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 703                         break;
 704                 case KEYCODE_b:
 705                         if (!config_render && !config_debug_opengl) {
 706                                 osd_info("", "not applicable");
 707                                 break;
 708                         }
 709                         if (config_benson_size == 0.5) {
 710                                 config_benson_size = 1.0;
 711                                 config_fov = FOV_NOVAGEN;
 712                         } else {
 713                                 config_benson_size = 0.5;
 714                                 config_fov = FOV_JOLLY;
 715                         }
 716                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 717                         break;
 718                 case KEYCODE_i:
 719                         if (!intro_skipped)
 720                                 skip_intro();
 721                         else
 722                                 osd_info("", "not applicable");
 723                         break;
 724                 case KEYCODE_c:
 725                         if (config_ctrl_c)
 726                                 quit = 1;
 727                         break;
 728                 case KEYCODE_KP_PLUS:
 729                         if (config_fov / 1.2 >= FOV_MIN)
 730                                 config_fov /= 1.2;
 731                         disp_fov:
 732                         {
 733                                 char text[16];
 734                                 sprintf(text, "%.2f", config_fov);
 735                                 osd_info("FOV", text);
 736                         }
 737                         break;
 738                 case KEYCODE_KP_MINUS:
 739                         if (config_fov * 1.2 <= FOV_MAX)
 740                                 config_fov *= 1.2;
 741                         goto disp_fov;
 742                 default: break;
 743                 }
 744                 /* do not pass keys to game while holding CTRL */
 745                 return;
 746         }
 747
 748         if (keycode == KEYCODE_PAUSE && down)
 749                 help_view ^= 1;
 750
 751         /* in help view we don't need to forward keypresses */
 752         if (help_view)
 753                 return;
 754
 755         switch (keycode) {
 756         case KEYCODE_LSHIFT:
 757                 set_key("LSH", down);
 758                 shift = down;
 759                 break;
 760         case KEYCODE_RSHIFT:
 761                 set_key("RSH", down);
 762                 shift = down;
 763                 break;
 764         case KEYCODE_LEFT:
 765                 if (shift && down) {
 766                         set_key("LF", down);
 767                         set_joystick(-1, -1, -1, -1, -1);
 768                         break;
 769                 }
 770                 set_key("LF", 0);
 771                 set_joystick(down, -1, -1, -1, -1);
 772                 break;
 773         case KEYCODE_RIGHT:
 774                 if (shift && down) {
 775                         set_key("RT", down);
 776                         set_joystick(-1, -1, -1, -1, -1);
 777                         break;
 778                 }
 779                 set_key("RT", 0);
 780                 set_joystick(-1, down, -1, -1, -1);
 781                 break;
 782         case KEYCODE_UP:
 783                 if (shift && down) {
 784                         set_key("UP", down);
 785                         set_joystick(-1, -1, -1, -1, -1);
 786                         break;
 787                 }
 788                 set_key("UP", 0);
 789                 set_joystick(-1, -1, down, -1, -1);
 790                 break;
 791         case KEYCODE_DOWN:
 792                 if (shift && down) {
 793                         set_key("DN", down);
 794                         set_joystick(-1, -1, -1, -1, -1);
 795                         break;
 796                 }
 797                 set_key("DN", 0);
 798                 set_joystick(-1, -1, -1, down, -1);
 799                 break;
 800         case KEYCODE_END:
 801                 set_joystick(-1, -1, -1, -1, down);
 802                 break;
 803
 804         case KEYCODE_a: set_key("A", down); break;
 805         case KEYCODE_b: set_key("B", down); break;
 806         case KEYCODE_c: set_key("C", down); break;
 807         case KEYCODE_d: set_key("D", down); break;
 808         case KEYCODE_e: set_key("E", down); break;
 809         case KEYCODE_f: set_key("F", down); break;
 810         case KEYCODE_g: set_key("G", down); break;
 811         case KEYCODE_h: set_key("H", down); break;
 812         case KEYCODE_i: set_key("I", down); break;
 813         case KEYCODE_j: set_key("J", down); break;
 814         case KEYCODE_k: set_key("K", down); break;
 815         case KEYCODE_l: set_key("L", down); break;
 816         case KEYCODE_m: set_key("M", down); break;
 817         case KEYCODE_n: set_key("N", down); break;
 818         case KEYCODE_o: set_key("O", down); break;
 819         case KEYCODE_p: set_key("P", down); break;
 820         case KEYCODE_q: set_key("Q", down); break;
 821         case KEYCODE_r: set_key("R", down); break;
 822         case KEYCODE_s: set_key("S", down); break;
 823         case KEYCODE_t: set_key("T", down); break;
 824         case KEYCODE_u: set_key("U", down); break;
 825         case KEYCODE_v: set_key("V", down); break;
 826         case KEYCODE_w: set_key("W", down); break;
 827         case KEYCODE_x: set_key("X", down); break;
 828         case KEYCODE_y: set_key("Y", down); break;
 829         case KEYCODE_z: set_key("Z", down); break;
 830
 831         case KEYCODE_0: set_key("0", down); break;
 832         case KEYCODE_1: set_key("1", down); break;
 833         case KEYCODE_2: set_key("2", down); break;
 834         case KEYCODE_3: set_key("3", down); break;
 835         case KEYCODE_4: set_key("4", down); break;
 836         case KEYCODE_5: set_key("5", down); break;
 837         case KEYCODE_6: set_key("6", down); break;
 838         case KEYCODE_7: set_key("7", down); break;
 839         case KEYCODE_8: set_key("8", down); break;
 840         case KEYCODE_9: set_key("9", down); break;
 841
 842         case KEYCODE_KP_0: set_key("NP0", down); break;
 843         case KEYCODE_KP_1: set_key("NP1", down); break;
 844         case KEYCODE_KP_2: set_key("NP2", down); break;
 845         case KEYCODE_KP_3: set_key("NP3", down); break;
 846         case KEYCODE_KP_4: set_key("NP4", down); break;
 847         case KEYCODE_KP_5: set_key("NP5", down); break;
 848         case KEYCODE_KP_6: set_key("NP6", down); break;
 849         case KEYCODE_KP_7: set_key("NP7", down); break;
 850         case KEYCODE_KP_8: set_key("NP8", down); break;
 851         case KEYCODE_KP_9: set_key("NP9", down); break;
 852         case KEYCODE_KP_DIVIDE: set_key("NPDIV", down); break;
 853         case KEYCODE_KP_MULTIPLY: set_key("NPMUL", down); break;
 854         case KEYCODE_KP_MINUS: set_key("NPSUB", down); break;
 855         case KEYCODE_KP_PLUS: set_key("NPADD", down); break;
 856         case KEYCODE_KP_PERIOD: set_key("NPDEL", down); break;
 857         // NPLPAREN and NPRPAREN are not emulated
 858
 859         case KEYCODE_F1: set_key("F1", down); break;
 860         case KEYCODE_F2: set_key("F2", down); break;
 861         case KEYCODE_F3: set_key("F3", down); break;
 862         case KEYCODE_F4: set_key("F4", down); break;
 863         case KEYCODE_F5: set_key("F5", down); break;
 864         case KEYCODE_F6: set_key("F6", down); break;
 865         case KEYCODE_F7: set_key("F7", down); break;
 866         case KEYCODE_F8: set_key("F8", down); break;
 867         case KEYCODE_F9: set_key("F9", down); break;
 868         case KEYCODE_F10: set_key("F10", down); break;
 869
 870         case KEYCODE_SPACE: set_key("SPC", down); break;
 871         case KEYCODE_BACKSPACE: set_key("BS", down); break;
 872         case KEYCODE_TAB: set_key("TAB", down); break;
 873         case KEYCODE_KP_ENTER: set_key("ENT", down); break;
 874         case KEYCODE_RETURN: set_key("RET", down); break;
 875         case KEYCODE_ESCAPE: set_key("ESC", down); break;
 876         case KEYCODE_DELETE: set_key("DEL", down); break;
 877         case KEYCODE_INSERT: set_key("HELP", down); break;
 878
 879         default: break;
 880         }
 881 }
 882
 883 void audio_sdl(float *data, int length)
 884 {
 885         int fill, s;
 886
 887         /* read sound from sound buffer
 888          * buffer pointer read and write is atomic, so no locking required!
 889          */
 890         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 891         if (fill < length) {
 892 #ifdef DEBUG_SOUND_BUFFERING
 893                 fprintf(stderr, "sound buffer underrun\n");
 894 #endif
 895                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 896                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 897         }
 898         for (s = 0; s < length; s++) {
 899                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 900                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 901         }
 902 #ifdef DEBUG_SOUND_BUFFERING
 903         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 904 #endif
 905         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 906 }
 907
 908 void sound_irq(void)
 909 {
 910         /* trigger and execute IRQ 4 = sound */
 911         execute_cpu(4, NULL);
 912 }
 913
 914 int main(int argc, char *argv[])
 915 {
 916         int rc;
 917         int sdl_sound_chunk;
 918
 919         home_dir = getenv("HOME");
 920         if (!home_dir)
 921                 home_dir = "";
 922
 923         rc = parse_args(argc, argv);
 924         if (rc)
 925                 return 0;
 926
 927         /* allocate image */
 928         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 929         if (!image) {
 930                 print_error("Failed to allocate image buffer\n");
 931                 goto done;
 932         }
 933
 934         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 935                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 936                 goto done;
 937         }
 938         if ((1000 % IRQ_RATE)) {
 939                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 940                 goto done;
 941         }
 942
 943         /* calculate SDL chunk size for audio
 944          * it must be a power of two, but not more than the chunk size for each IRQ!
 945          */
 946         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 947                 ;
 948         sdl_sound_chunk >>= 1;
 949 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 950
 951         /* allocate sound buffers */
 952         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 953         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 954         if (!sound_buffer) {
 955                 print_error("Failed to allocate image buffer\n");
 956                 goto done;
 957         }
 958
 959         /* allocate memory */
 960         memory = calloc(MEMORY_SIZE, 1);
 961         if (!memory) {
 962                 print_error("Failed to allocate cpu's memory\n");
 963                 goto done;
 964         }
 965         stop_event = calloc(MEMORY_SIZE, 1);
 966         if (!stop_event) {
 967                 print_error("Failed to allocate cpu's stop_event memory\n");
 968                 goto done;
 969         }
 970         chipreg = calloc(IOSIZE, 1);
 971         if (!chipreg) {
 972                 print_error("Failed to allocate chip register\n");
 973                 goto done;
 974         }
 975
 976         /* init cpu code */
 977         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 978
 979         /* init disk emulation */
 980         disk_init(disk_read, disk_write);
 981
 982         /* load binary */
 983         mercenary_load();
 984
 985         /* patch some stuff */
 986         mercenary_patch();
 987
 988         /* init SDL and OpenGL */
 989 #ifdef HAVE_OVR
 990         int vbl_sync = 0;
 991 #else
 992         int vbl_sync = 1;
 993 #endif
 994         rc = init_sdl(argv[0], (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH, (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, config_multisampling, vbl_sync);
 995         if (rc < 0)
 996                 goto done;
 997 #ifdef HAVE_OVR
 998         rc = init_ovr();
 999         if (rc < 0)
1000                 goto done;
1001 #endif
1002         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1003         if (rc < 0)
1004                 goto done;
1005         resize_opengl((config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH, (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT);
1006
1007         /* init osd */
1008         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1009         if (rc < 0)
1010                 goto done;
1011         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1012         if (rc < 0)
1013                 goto done;
1014         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1015         if (!help_osd)
1016                 goto done;
1017         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1018         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1019                 "Emulation:\n"
1020                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1021                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1022                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1023                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1024                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1025                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1026                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1027                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1028                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1029                 "\n"
1030                 "Answer to a Question:\n"
1031                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1032                 "\n"
1033                 "Walking / Driving / Flying:\n"
1034                 "        Use cursor keys as joystick, to move player / craft.\n"
1035                 "        Press `R' for running, 'W' for walking speed.\n"
1036                 "        Press `B' to board, `L' to leave.\n"
1037                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1038                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1039                 "        Press `SPACE' to stop craft.\n"
1040                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1041                 "        Press `T' for turbo on certain craft.\n"
1042                 "        Press `END' as joystick's fire button.\n"
1043                 "\n"
1044                 "Elevator:\n"
1045                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1046                 "\n"
1047                 "Inside a transporter:\n"
1048                 "        Press `1'...`0' to select destination.\n"
1049                 "\n"
1050                 "Items:\n"
1051                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1052                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1053                 "        Press `NUMPAD Enter' to select certain items.\n"
1054                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1055                 "        Press `NUMPAD *' to read entry\n"
1056                 "Saving / Loading / Pause:\n"
1057                 "        Press `INSERT' to loading and saving options.\n"
1058                 "        Press `ENTER' to pause game, other key to continue.\n"
1059                 ,HELP_ALPHA, 1, 2, 5, 0);
1060         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1061         if (!info_osd)
1062                 goto done;
1063
1064         /* init audio */
1065         sound_init(SOUND_SAMPLERATE, sound_irq);
1066
1067         /* start cpu */
1068         reset_cpu();
1069
1070         if (config_skip_intro)
1071                 skip_intro();
1072
1073         /* run game */
1074         main_loop();
1075
1076 done:
1077         exit_opengl();
1078 #ifdef HAVE_OVR
1079         exit_ovr();
1080 #endif
1081         exit_sdl();
1082
1083         if (chipreg)
1084                 free(chipreg);
1085         if (stop_event)
1086                 free(stop_event);
1087         if (memory)
1088                 free(memory);
1089         if (sound_buffer)
1090                 free(sound_buffer);
1091         if (image)
1092                 free(image);
1093         if (help_osd)
1094                 free(help_osd);
1095         if (info_osd)
1096                 free(info_osd);
1097
1098         return 0;
1099 }
1100