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    672
  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 static int window_width, window_height;
 121
 122 static const char *home_dir;
 123
 124 static int quit = 0;
 125
 126 int parse_args(int argc, char *argv[])
 127 {
 128         int i = 1;
 129
 130         while (argc > i) {
 131                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 132                         print_info("Usage: %s\n", argv[0]);
 133                         print_info(" -s --render-speed original | fast\n");
 134                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 135                         print_info("    --fps <fps>\n");
 136                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 137                         print_info(" -v --video-filter on | off\n");
 138                         print_info("        Set video filter.\n");
 139                         print_info(" -a --audio-filter on | off\n");
 140                         print_info("        Set audio filter.\n");
 141                         print_info(" -r --render original | opengl\n");
 142                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 143                         print_info(" -b --benson normal | half\n");
 144                         print_info("        Size of 'Benson' (control panel).\n");
 145                         print_info(" -m --multisampling <samples>\n");
 146                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 147                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 148                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 149                         print_info(" -i --skip-intro\n");
 150                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 151                         print_info("Debug options:\n");
 152                         print_info(" -o --debug-opengl\n");
 153                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 154                         print_info("    --debug-transparent\n");
 155                         print_info("        Draw all things half transparent.\n");
 156                         print_info("    --ctrl-c\n");
 157                         print_info("        Use CTRL+C to exit game (used for development)\n");
 158                         return -1;
 159                 } else
 160                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 161                         i++;
 162                         if (argc == i) {
 163 missing_parameter:
 164                                 print_info("Missing parameter, use '--help'!\n");
 165                                 return -1;
 166                         }
 167                         if (!strcmp(argv[i], "original"))
 168                                 config_amiga_speed = 1;
 169                         else
 170                         if (!strcmp(argv[i], "fast"))
 171                                 config_amiga_speed = 0;
 172                         else {
 173 illegal_parameter:
 174                                 print_info("Illegal parameter, use '--help'!\n");
 175                                 return -1;
 176                         }
 177                 } else
 178                 if (!strcmp(argv[i], "--fps")) {
 179                         i++;
 180                         if (argc == i)
 181                                 goto missing_parameter;
 182                         config_fps = atof(argv[i]);
 183                         if (config_fov <= 0.0)
 184                                 goto illegal_parameter;
 185                 } else
 186                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 187                         i++;
 188                         if (argc == i)
 189                                 goto missing_parameter;
 190                         if (!strcmp(argv[i], "on"))
 191                                 config_video_filter = 1;
 192                         else
 193                         if (!strcmp(argv[i], "off"))
 194                                 config_video_filter = 0;
 195                         else
 196                                 goto illegal_parameter;
 197                 } else
 198                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 199                         i++;
 200                         if (argc == i)
 201                                 goto missing_parameter;
 202                         if (!strcmp(argv[i], "on"))
 203                                 config_audio_filter = 1;
 204                         else
 205                         if (!strcmp(argv[i], "off"))
 206                                 config_audio_filter = 0;
 207                         else
 208                                 goto illegal_parameter;
 209                 } else
 210                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 211                         i++;
 212                         if (argc == i)
 213                                 goto missing_parameter;
 214                         if (!strcmp(argv[i], "original"))
 215                                 config_render = 0;
 216                         else
 217                         if (!strcmp(argv[i], "opengl"))
 218                                 config_render = 1;
 219                         else
 220                                 goto illegal_parameter;
 221                 } else
 222                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 223                         i++;
 224                         if (argc == i)
 225                                 goto missing_parameter;
 226                         if (!strcmp(argv[i], "normal"))
 227                                 config_benson_size = 1.0;
 228                         else
 229                         if (!strcmp(argv[i], "half")) {
 230                                 config_benson_size = 0.5;
 231                                 if (config_fov == FOV_NOVAGEN)
 232                                         config_fov = FOV_JOLLY;
 233                         } else
 234                                 goto illegal_parameter;
 235                 } else
 236                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 237                         i++;
 238                         if (argc == i)
 239                                 goto missing_parameter;
 240                         config_multisampling = atoi(argv[i]);
 241                 } else
 242                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 243                         i++;
 244                         if (argc == i)
 245                                 goto missing_parameter;
 246                         config_fov = atof(argv[i]);
 247                         if (config_fov < 1.0 || config_fov > 179.0)
 248                                 goto illegal_parameter;
 249                 } else
 250                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 251                         config_skip_intro = 1;
 252                 } else
 253                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 254                         config_debug_opengl = 1;
 255                 } else
 256                 if (!strcmp(argv[i], "--debug-transparent")) {
 257                         config_debug_transparent = 1;
 258                 } else
 259                 if (!strcmp(argv[i], "--ctrl-c")) {
 260                         config_ctrl_c = 1;
 261                 } else {
 262                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 263                         return -1;
 264                 }
 265                 i++;
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void resize_window(int width, int height)
 272 {
 273         window_width = width;
 274         window_height = height;
 275 }
 276
 277 static void skip_intro(void)
 278 {
 279         int event;
 280         double render_delay = 0.0;
 281         double cycle_count;
 282
 283         if (intro_skipped)
 284                 return;
 285
 286         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 287         do {
 288                 /* render, if not delayed */
 289                 if (render_delay <= 0.0) {
 290                         cycle_count = 0;
 291                         do {
 292                                 cycle_count += execute_cpu(0, &event);
 293                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 294                         render_delay += (double)cycle_count / CPU_SPEED;
 295                 }
 296                 /* VBL */
 297                 execute_cpu(3, NULL);
 298                 /* count down render delay */
 299                 if (render_delay) {
 300                         render_delay -= 1.0 / (double)IRQ_RATE;
 301                         if (render_delay < 0.0)
 302                                 render_delay = 0.0;
 303                 }
 304         } while (event != STOP_AT_CLEAR_SCREEN1);
 305
 306         intro_skipped = 1;
 307 }
 308
 309 static void special_event(int event)
 310 {
 311         if (render_improved)
 312                 render_capture_event(event);
 313 }
 314
 315 static void main_loop(void)
 316 {
 317         double frame_step, frame_time = 0.0, frame_render = 1;
 318         int had_first_irq = 0;
 319         static uint32_t current_time, last_time = 0, diff;
 320         int i, rc;
 321         int space, length;
 322         int cycle_count, event = STOP_AT_END;
 323         double render_delay = 0.0;
 324         uint32_t palette_address;
 325         uint16_t palette[16];
 326         int eye;
 327
 328         last_time = ticks_sdl();
 329
 330         /* render result on window */
 331         while (!quit) {
 332                 /* if we are in interstellar fligt, we use 50 Hz */
 333                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 334                 /* else we use whatever frame rate the user wants */
 335                 if (render_capture_is_interstellar())
 336                         frame_step = vbl_duration * 50.0;
 337                 else if (!intro_skipped)
 338                         frame_step = vbl_duration * 10.0;
 339                 else
 340                         frame_step = vbl_duration * config_fps;
 341                 if (frame_step > 1.0)
 342                         frame_step = 1.0;
 343                 /* handle SDL events */
 344                 rc = event_sdl();
 345                 if (rc)
 346                         break;
 347
 348                 /* initialize rendering */
 349                 debug_opengl = config_debug_opengl;
 350                 benson_size = config_benson_size;
 351                 render_legacy = (!config_render) || debug_opengl;
 352                 render_improved = config_render || debug_opengl;
 353                 if (!render_improved) {
 354                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 355                         render_capture_reset();
 356                 }
 357                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 358                 /* amgia speed: don't render if we still delay */
 359                 /* non amiga speed: render if we need a new frame */
 360                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 361                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 362                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 363                 if (((frame_render && !config_amiga_speed)
 364                   || (config_amiga_speed && render_delay <= 0.0)
 365                   || event == STOP_AT_WAIT_INPUT)
 366                 && !(had_first_irq && help_view)) {
 367                         frame_render = 0;
 368                         /* start capturing for improved graphics */
 369                         if (render_improved)
 370                                 render_capture_start(config_fov, config_improve_extend_roads, config_debug_transparent);
 371
 372                         /* execute until the rendered image is ready (wait for VBL) */
 373                         cycle_count = 0;
 374                         do {
 375                                 cycle_count += execute_cpu(0, &event);
 376                                 /* handle special events */
 377                                 special_event(event);
 378                                 if (event == STOP_AT_CLEAR_SCREEN1)
 379                                         intro_skipped = 1;
 380                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 381                         /* stop capturing for improved graphics */
 382                         if (render_improved)
 383                                 render_capture_stop();
 384                         /* copy palette */
 385                         palette_address = mercenary_palette_view();
 386                         for (i = 0; i < 16; i++)
 387                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 388                         /* for amiga speed: set delay by the number of cycles */
 389                         if (config_amiga_speed)
 390                                 render_delay += (double)cycle_count / CPU_SPEED;
 391                 }
 392
 393                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 394 #ifdef HAVE_OVR
 395                 begin_render_ovr();
 396                 for (eye = 0; eye < 2; eye++) {
 397                         /* viewport and frustum is set here */
 398                         begin_render_ovr_eye(eye);
 399 #else
 400                 eye = 0;
 401                 {
 402 #endif
 403                         /* clear screen */
 404 #ifdef HAVE_OVR
 405                         opengl_clear(1);
 406 #else
 407                         opengl_clear(0);
 408 #endif
 409                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 410                         if (render_improved) {
 411 #ifndef HAVE_OVR
 412                                 /* viewport and frustum is set here */
 413                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 414 #endif
 415                                 /* render improved graphics, interpolate, if required,
 416                                  * if no item list is available, for legacy rendering
 417                                  */
 418 #ifdef HAVE_OVR
 419                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 420 #else
 421                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 422 #endif
 423                                 if (rc)
 424                                         goto goto_legacy;
 425                                 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);
 426                                 if (help_view)
 427                                         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);
 428                                 if (osd_timer) {
 429                                         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);
 430                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 431                                                 osd_timer = 0;
 432                                 }
 433                         }
 434                         /* setup viewport for legacy image and render image, if enabled */
 435                         /* also render legacy, if render_improved failed due to not (yet) available items */
 436                         if (render_legacy) {
 437                                 goto_legacy:
 438                                 /* render game view without benson
 439                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 440                                  */
 441                                 if (had_first_irq)
 442                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 443 #ifndef HAVE_OVR
 444                                 /* viewport and frustum is set here */
 445                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 446 #endif
 447                                 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);
 448                                 if (help_view)
 449                                         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);
 450                                 if (osd_timer) {
 451                                         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);
 452                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 453                                                 osd_timer = 0;
 454                                 }
 455                         }
 456 #ifdef HAVE_OVR
 457                         end_render_ovr_eye(eye);
 458                 }
 459                 /* at this point we are ready with our image, so we display */
 460                 end_render_ovr();
 461                 render_mirror_ovr(window_width, window_height);
 462 #else
 463                 }
 464 #endif
 465                 swap_sdl();
 466
 467                 /* advance frame time, if we are not in help view  */
 468                 if (!(had_first_irq && help_view)) {
 469                         frame_time += frame_step;
 470                         if (frame_time >= 1.0) {
 471                                 frame_time -= 1.0;
 472                                 frame_render = 1;
 473                         }
 474                 }
 475
 476                 /* measure frame rate */
 477                 framerate_measure();
 478
 479                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 480                 /* only do this, if we are not in help view */
 481                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 482                 if (!(had_first_irq && help_view)) {
 483                         current_time = ticks_sdl();
 484                         diff = current_time - last_time;
 485                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 486                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 487                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 488                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 489                         }
 490                         while (diff > 1000 / IRQ_RATE) {
 491                                 /* trigger and execute IRQ 3 = VBL */
 492                                 execute_cpu(3, NULL);
 493                                 had_first_irq = 1;
 494                                 /* transfer benson without game view
 495                                  * because we only got benson refreshed during VBL IRQ
 496                                  */
 497                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 498                                 /* render sound to sound buffer
 499                                  * buffer pointer read and write is atomic, so no locking required!
 500                                  */
 501                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 502                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 503 #ifdef DEBUG_SOUND_BUFFERING
 504                                         fprintf(stderr, "sound buffer overflow\n");
 505 #endif
 506                                         length = space;
 507                                 } else
 508                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 509 #ifdef DEBUG_SOUND_BUFFERING
 510                                 printf("can write %d, write %d\n", space, length);
 511                                 static int cnt = 0;
 512                                 int s;
 513                                 for (s = 0; s < length; s++) {
 514                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 515                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 516                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 517                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 518                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 519                                          cnt++;
 520                                 }
 521 #else
 522                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 523 #endif
 524                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 525                                 diff -= 1000 / IRQ_RATE;
 526                                 last_time += 1000 / IRQ_RATE;
 527
 528                                 /* count down render delay */
 529                                 if (render_delay) {
 530                                         render_delay -= 1.0 / (double)IRQ_RATE;
 531                                         if (render_delay < 0.0)
 532                                                 render_delay = 0.0;
 533                                 }
 534                         }
 535                 }
 536         }
 537 }
 538
 539 static uint16_t io_read(uint32_t address)
 540 {
 541         uint16_t value = 0xffff;
 542
 543         /* joystick and fire button */
 544         if (address == 0xbfe000 || address == 0xdff00c)
 545                 value &= emulate_joystick_read(address);
 546         /* keyboard */
 547         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 548                 value &= emulate_keyboard_read(address);
 549         /* diskette */
 550         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 551                 value &= emulate_disk_read(address);
 552
 553         return value;
 554 }
 555
 556 static void io_write(uint32_t address, uint16_t value)
 557 {
 558         /* dmacon and sound registers */
 559         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 560                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 561         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 562                 emulate_disk_write(address, value);
 563 }
 564
 565 /* two tracks with 0x1820 words of length */
 566 static uint8_t game_save[2][0x1820 << 1];
 567 static int last_track = 0;
 568
 569 /* game reads track with saved game */
 570 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 571 {
 572         if (length > sizeof(game_save[0])) {
 573                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 574                 return;
 575         }
 576
 577         /* if even track is selected, load game */
 578         if (!(track & 1)) {
 579                 char filename[256];
 580                 int gamesave_num = (track - 2) >> 1;
 581                 int got;
 582                 FILE *fp;
 583
 584                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 585 #if defined(_WIN32)
 586                 filename[0] = '\0';
 587 #else
 588                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 589                 mkdir(filename, 0777);
 590 #endif
 591                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 592                 fp = fopen(filename, "r");
 593                 if (!fp) {
 594 fail:
 595                         print_info("failed to load game from '%s'\n", filename);
 596                         goto copy;
 597                 }
 598                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 599                 fclose(fp);
 600                 if (got != 2)
 601                         goto fail;
 602         }
 603
 604 copy:
 605         /* copy track */
 606         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 607 }
 608
 609 /* game writes track with saved game */
 610 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 611 {
 612         /* skip sync info that is provided by game and only relevant for a real disk track */
 613         data += 0x200;
 614         length -= 0x200;
 615
 616         if (length != sizeof(game_save[0])) {
 617                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 618                 return;
 619         }
 620
 621         /* don't save if last track is the same, because disk is written on both sides with the same data */
 622         if (track == last_track) {
 623                 if (memcmp(memory + data, game_save[track & 1], length)) {
 624                         print_error("saving game data on other side of the disk is different, please fix!\n");
 625                 }
 626                 return;
 627         }
 628         last_track = track;
 629
 630         /* save game data */
 631         memcpy(game_save[track & 1], memory + data, length);
 632
 633         /* if done with saving */
 634         if ((track & 1)) {
 635                 char filename[256];
 636                 int gamesave_num = (track - 2) >> 1;
 637                 int wrote;
 638                 FILE *fp;
 639
 640 #if defined(_WIN32)
 641                 filename[0] = '\0';
 642 #else
 643                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 644                 mkdir(filename, 0777);
 645 #endif
 646                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 647                 fp = fopen(filename, "w");
 648                 if (!fp) {
 649 fail:
 650                         print_error("failed to save game to '%s'\n", filename);
 651                         return;
 652                 }
 653                 print_info("Game state saved to '%s'\n", filename);
 654                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 655                 fclose(fp);
 656                 if (wrote != 2)
 657                         goto fail;
 658         }
 659 }
 660
 661 static void osd_info(const char *param, const char *value)
 662 {
 663         char line[41] = "                                        ";
 664
 665         if (param[0]) {
 666                 strncpy(line + 21 - strlen(param), param, strlen(param));
 667                 line[22] = ':';
 668         }
 669         if (strlen(value) > 15) {
 670                 print_error("string too long\n");
 671                 return;
 672         }
 673         strncpy(line + 25, value, strlen(value));
 674         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 675         osd_timer = ticks_sdl() + 2500;
 676 }
 677
 678 static int shift = 0, ctrl = 0;
 679
 680 static void keyboard_sdl(int down, enum keycode keycode)
 681 {
 682         switch (keycode) {
 683         case KEYCODE_LCTRL:
 684         case KEYCODE_RCTRL:
 685                 ctrl = down;
 686                 break;
 687         default: break;
 688         }
 689
 690         if (ctrl && down) {
 691                 switch (keycode) {
 692                 case KEYCODE_h:
 693                         help_view ^= 1;
 694                         break;
 695                 case KEYCODE_v:
 696                         config_video_filter ^= 1;
 697                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 698                         break;
 699                 case KEYCODE_a:
 700                         config_audio_filter ^= 1;
 701                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 702                         break;
 703                 case KEYCODE_s:
 704                         config_amiga_speed ^= 1;
 705                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 706                         break;
 707                 case KEYCODE_r:
 708                         config_render ^= 1;
 709                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 710                         break;
 711                 case KEYCODE_b:
 712                         if (!config_render && !config_debug_opengl) {
 713                                 osd_info("", "not applicable");
 714                                 break;
 715                         }
 716                         if (config_benson_size == 0.5) {
 717                                 config_benson_size = 1.0;
 718                                 config_fov = FOV_NOVAGEN;
 719                         } else {
 720                                 config_benson_size = 0.5;
 721                                 config_fov = FOV_JOLLY;
 722                         }
 723                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 724                         break;
 725                 case KEYCODE_i:
 726                         if (!intro_skipped)
 727                                 skip_intro();
 728                         else
 729                                 osd_info("", "not applicable");
 730                         break;
 731                 case KEYCODE_c:
 732                         if (config_ctrl_c)
 733                                 quit = 1;
 734                         break;
 735                 case KEYCODE_n:
 736 #ifdef HAVE_OVR
 737                         normalize_observer_ovr();
 738                         osd_info("", "change height");
 739 #else
 740                         osd_info("", "not applicable");
 741 #endif
 742                         break;
 743                 case KEYCODE_KP_PLUS:
 744                         if (config_fov / 1.2 >= FOV_MIN)
 745                                 config_fov /= 1.2;
 746                         disp_fov:
 747                         {
 748                                 char text[16];
 749                                 sprintf(text, "%.2f", config_fov);
 750                                 osd_info("FOV", text);
 751                         }
 752                         break;
 753                 case KEYCODE_KP_MINUS:
 754                         if (config_fov * 1.2 <= FOV_MAX)
 755                                 config_fov *= 1.2;
 756                         goto disp_fov;
 757                 default: break;
 758                 }
 759                 /* do not pass keys to game while holding CTRL */
 760                 return;
 761         }
 762
 763         if (keycode == KEYCODE_PAUSE && down)
 764                 help_view ^= 1;
 765
 766         /* in help view we don't need to forward keypresses */
 767         if (help_view)
 768                 return;
 769
 770         switch (keycode) {
 771         case KEYCODE_LSHIFT:
 772                 set_key("LSH", down);
 773                 shift = down;
 774                 break;
 775         case KEYCODE_RSHIFT:
 776                 set_key("RSH", down);
 777                 shift = down;
 778                 break;
 779         case KEYCODE_LEFT:
 780                 if (shift && down) {
 781                         set_key("LF", down);
 782                         set_joystick(-1, -1, -1, -1, -1);
 783                         break;
 784                 }
 785                 set_key("LF", 0);
 786                 set_joystick(down, -1, -1, -1, -1);
 787                 break;
 788         case KEYCODE_RIGHT:
 789                 if (shift && down) {
 790                         set_key("RT", down);
 791                         set_joystick(-1, -1, -1, -1, -1);
 792                         break;
 793                 }
 794                 set_key("RT", 0);
 795                 set_joystick(-1, down, -1, -1, -1);
 796                 break;
 797         case KEYCODE_UP:
 798                 if (shift && down) {
 799                         set_key("UP", down);
 800                         set_joystick(-1, -1, -1, -1, -1);
 801                         break;
 802                 }
 803                 set_key("UP", 0);
 804                 set_joystick(-1, -1, down, -1, -1);
 805                 break;
 806         case KEYCODE_DOWN:
 807                 if (shift && down) {
 808                         set_key("DN", down);
 809                         set_joystick(-1, -1, -1, -1, -1);
 810                         break;
 811                 }
 812                 set_key("DN", 0);
 813                 set_joystick(-1, -1, -1, down, -1);
 814                 break;
 815         case KEYCODE_END:
 816                 set_joystick(-1, -1, -1, -1, down);
 817                 break;
 818
 819         case KEYCODE_a: set_key("A", down); break;
 820         case KEYCODE_b: set_key("B", down); break;
 821         case KEYCODE_c: set_key("C", down); break;
 822         case KEYCODE_d: set_key("D", down); break;
 823         case KEYCODE_e: set_key("E", down); break;
 824         case KEYCODE_f: set_key("F", down); break;
 825         case KEYCODE_g: set_key("G", down); break;
 826         case KEYCODE_h: set_key("H", down); break;
 827         case KEYCODE_i: set_key("I", down); break;
 828         case KEYCODE_j: set_key("J", down); break;
 829         case KEYCODE_k: set_key("K", down); break;
 830         case KEYCODE_l: set_key("L", down); break;
 831         case KEYCODE_m: set_key("M", down); break;
 832         case KEYCODE_n: set_key("N", down); break;
 833         case KEYCODE_o: set_key("O", down); break;
 834         case KEYCODE_p: set_key("P", down); break;
 835         case KEYCODE_q: set_key("Q", down); break;
 836         case KEYCODE_r: set_key("R", down); break;
 837         case KEYCODE_s: set_key("S", down); break;
 838         case KEYCODE_t: set_key("T", down); break;
 839         case KEYCODE_u: set_key("U", down); break;
 840         case KEYCODE_v: set_key("V", down); break;
 841         case KEYCODE_w: set_key("W", down); break;
 842         case KEYCODE_x: set_key("X", down); break;
 843         case KEYCODE_y: set_key("Y", down); break;
 844         case KEYCODE_z: set_key("Z", down); break;
 845
 846         case KEYCODE_0: set_key("0", down); break;
 847         case KEYCODE_1: set_key("1", down); break;
 848         case KEYCODE_2: set_key("2", down); break;
 849         case KEYCODE_3: set_key("3", down); break;
 850         case KEYCODE_4: set_key("4", down); break;
 851         case KEYCODE_5: set_key("5", down); break;
 852         case KEYCODE_6: set_key("6", down); break;
 853         case KEYCODE_7: set_key("7", down); break;
 854         case KEYCODE_8: set_key("8", down); break;
 855         case KEYCODE_9: set_key("9", down); break;
 856
 857         case KEYCODE_KP_0: set_key("NP0", down); break;
 858         case KEYCODE_KP_1: set_key("NP1", down); break;
 859         case KEYCODE_KP_2: set_key("NP2", down); break;
 860         case KEYCODE_KP_3: set_key("NP3", down); break;
 861         case KEYCODE_KP_4: set_key("NP4", down); break;
 862         case KEYCODE_KP_5: set_key("NP5", down); break;
 863         case KEYCODE_KP_6: set_key("NP6", down); break;
 864         case KEYCODE_KP_7: set_key("NP7", down); break;
 865         case KEYCODE_KP_8: set_key("NP8", down); break;
 866         case KEYCODE_KP_9: set_key("NP9", down); break;
 867         case KEYCODE_KP_DIVIDE: set_key("NPDIV", down); break;
 868         case KEYCODE_KP_MULTIPLY: set_key("NPMUL", down); break;
 869         case KEYCODE_KP_MINUS: set_key("NPSUB", down); break;
 870         case KEYCODE_KP_PLUS: set_key("NPADD", down); break;
 871         case KEYCODE_KP_PERIOD: set_key("NPDEL", down); break;
 872         // NPLPAREN and NPRPAREN are not emulated
 873
 874         case KEYCODE_F1: set_key("F1", down); break;
 875         case KEYCODE_F2: set_key("F2", down); break;
 876         case KEYCODE_F3: set_key("F3", down); break;
 877         case KEYCODE_F4: set_key("F4", down); break;
 878         case KEYCODE_F5: set_key("F5", down); break;
 879         case KEYCODE_F6: set_key("F6", down); break;
 880         case KEYCODE_F7: set_key("F7", down); break;
 881         case KEYCODE_F8: set_key("F8", down); break;
 882         case KEYCODE_F9: set_key("F9", down); break;
 883         case KEYCODE_F10: set_key("F10", down); break;
 884
 885         case KEYCODE_SPACE: set_key("SPC", down); break;
 886         case KEYCODE_BACKSPACE: set_key("BS", down); break;
 887         case KEYCODE_TAB: set_key("TAB", down); break;
 888         case KEYCODE_KP_ENTER: set_key("ENT", down); break;
 889         case KEYCODE_RETURN: set_key("RET", down); break;
 890         case KEYCODE_ESCAPE: set_key("ESC", down); break;
 891         case KEYCODE_DELETE: set_key("DEL", down); break;
 892         case KEYCODE_INSERT: set_key("HELP", down); break;
 893
 894         default: break;
 895         }
 896 }
 897
 898 void audio_sdl(float *data, int length)
 899 {
 900         int fill, s;
 901
 902         /* read sound from sound buffer
 903          * buffer pointer read and write is atomic, so no locking required!
 904          */
 905         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 906         if (fill < length) {
 907 #ifdef DEBUG_SOUND_BUFFERING
 908                 fprintf(stderr, "sound buffer underrun\n");
 909 #endif
 910                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 911                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 912         }
 913         for (s = 0; s < length; s++) {
 914                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 915                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 916         }
 917 #ifdef DEBUG_SOUND_BUFFERING
 918         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 919 #endif
 920         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 921 }
 922
 923 void sound_irq(void)
 924 {
 925         /* trigger and execute IRQ 4 = sound */
 926         execute_cpu(4, NULL);
 927 }
 928
 929 int main(int argc, char *argv[])
 930 {
 931         int rc;
 932         int sdl_sound_chunk;
 933
 934         home_dir = getenv("HOME");
 935         if (!home_dir)
 936                 home_dir = "";
 937
 938         rc = parse_args(argc, argv);
 939         if (rc)
 940                 return 0;
 941
 942         /* allocate image */
 943         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 944         if (!image) {
 945                 print_error("Failed to allocate image buffer\n");
 946                 goto done;
 947         }
 948
 949         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 950                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 951                 goto done;
 952         }
 953         if ((1000 % IRQ_RATE)) {
 954                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 955                 goto done;
 956         }
 957
 958         /* calculate SDL chunk size for audio
 959          * it must be a power of two, but not more than the chunk size for each IRQ!
 960          */
 961         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 962                 ;
 963         sdl_sound_chunk >>= 1;
 964 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 965
 966         /* allocate sound buffers */
 967         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 968         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 969         if (!sound_buffer) {
 970                 print_error("Failed to allocate image buffer\n");
 971                 goto done;
 972         }
 973
 974         /* allocate memory */
 975         memory = calloc(MEMORY_SIZE, 1);
 976         if (!memory) {
 977                 print_error("Failed to allocate cpu's memory\n");
 978                 goto done;
 979         }
 980         stop_event = calloc(MEMORY_SIZE, 1);
 981         if (!stop_event) {
 982                 print_error("Failed to allocate cpu's stop_event memory\n");
 983                 goto done;
 984         }
 985         chipreg = calloc(IOSIZE, 1);
 986         if (!chipreg) {
 987                 print_error("Failed to allocate chip register\n");
 988                 goto done;
 989         }
 990
 991         /* init cpu code */
 992         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 993
 994         /* init disk emulation */
 995         disk_init(disk_read, disk_write);
 996
 997         /* load binary */
 998         mercenary_load();
 999
1000         /* patch some stuff */
1001         mercenary_patch();
1002
1003         /* init SDL and OpenGL */
1004 #ifdef HAVE_OVR
1005         int vbl_sync = 0;
1006         window_width = SCREEN_WIDTH;
1007         window_height = SCREEN_HEIGHT;
1008 #else
1009         int vbl_sync = 1;
1010         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
1011         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
1012 #endif
1013         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, config_multisampling, vbl_sync);
1014         if (rc < 0)
1015                 goto done;
1016 #ifdef HAVE_OVR
1017         rc = init_ovr();
1018         if (rc < 0)
1019                 goto done;
1020 #endif
1021         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
1022         if (rc < 0)
1023                 goto done;
1024
1025         /* init osd */
1026         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
1027         if (rc < 0)
1028                 goto done;
1029         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
1030         if (rc < 0)
1031                 goto done;
1032         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
1033         if (!help_osd)
1034                 goto done;
1035         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
1036         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
1037                 "Emulation:\n"
1038                 "        Press `PAUSE' to toggle this help screen on or off.\n"
1039                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
1040                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
1041                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
1042                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
1043                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
1044                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
1045                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
1046                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
1047 #ifdef HAVE_OVR
1048                 "        Press `CTRL' + `N' to normalize player position.\n"
1049 #endif
1050                 "\n"
1051                 "Answer to a Question:\n"
1052                 "        Press `O' (not Zero) for OK and other key for NO.\n"
1053                 "\n"
1054                 "Walking / Driving / Flying:\n"
1055                 "        Use cursor keys as joystick, to move player / craft.\n"
1056                 "        Press `R' for running, 'W' for walking speed.\n"
1057                 "        Press `B' to board, `L' to leave.\n"
1058                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
1059                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
1060                 "        Press `SPACE' to stop craft.\n"
1061                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1062                 "        Press `T' for turbo on certain craft.\n"
1063                 "        Press `END' as joystick's fire button.\n"
1064                 "\n"
1065                 "Elevator:\n"
1066                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1067                 "\n"
1068                 "Inside a transporter:\n"
1069                 "        Press `1'...`0' to select destination.\n"
1070                 "\n"
1071                 "Items:\n"
1072                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1073                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1074                 "        Press `NUMPAD Enter' to select certain items.\n"
1075                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1076                 "        Press `NUMPAD *' to read entry\n"
1077                 "Saving / Loading / Pause:\n"
1078                 "        Press `INSERT' to loading and saving options.\n"
1079                 "        Press `ENTER' to pause game, other key to continue.\n"
1080                 ,HELP_ALPHA, 1, 2, 5, 0);
1081         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1082         if (!info_osd)
1083                 goto done;
1084
1085         /* init audio */
1086         sound_init(SOUND_SAMPLERATE, sound_irq);
1087
1088         /* start cpu */
1089         reset_cpu();
1090
1091         if (config_skip_intro)
1092                 skip_intro();
1093
1094         /* run game */
1095         main_loop();
1096
1097 done:
1098         exit_opengl();
1099 #ifdef HAVE_OVR
1100         exit_ovr();
1101 #endif
1102         exit_sdl();
1103
1104         if (chipreg)
1105                 free(chipreg);
1106         if (stop_event)
1107                 free(stop_event);
1108         if (memory)
1109                 free(memory);
1110         if (sound_buffer)
1111                 free(sound_buffer);
1112         if (image)
1113                 free(image);
1114         if (help_osd)
1115                 free(help_osd);
1116         if (info_osd)
1117                 free(info_osd);
1118
1119         return 0;
1120 }
1121