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 "../../include/keycodes.h"
  27 #include "../libsdl/sdl.h"
  28 #ifdef HAVE_OVR
  29 #include "../libovr/ovr.h"
  30 #endif
  31 #include "../libsdl/opengl.h"
  32 #include "../libsdl/print.h"
  33 #include "../libcpu/m68k.h"
  34 #include "../libcpu/execute.h"
  35 #include "../libframerate/framerate.h"
  36 #include "../libvideo/video.h"
  37 #include "../libsound/sound.h"
  38 #include "../libjoystick/joystick.h"
  39 #include "../libkeyboard/keyboard.h"
  40 #include "../libdisk/disk.h"
  41 #include "../libtext/text.h"
  42 #include "mercenary.h"
  43 #include "render.h"
  44
  45 #define FOV_MIN         10.0
  46 #define FOV_NOVAGEN     64.0
  47 #define FOV_JOLLY       80.0
  48 #define FOV_MAX         170.0
  49
  50 static int config_ctrl_c = 0;
  51 static int config_amiga_speed = 0; /* fast speed */
  52 static double config_fps = 16.0;
  53 #if !defined(_WIN32)
  54 static const char *config_gamesave_dir = ".mercenary";
  55 #endif
  56 static int config_video_filter = 1;
  57 static int config_audio_filter = 1;
  58 static int config_render = 1; /* opengl render */
  59 static int config_skip_intro = 0;
  60 static int config_multisampling = 8;
  61 static double config_fov = FOV_NOVAGEN;
  62 static double config_monitor_distance = 31.5; /* inch */
  63 static double config_benson_size = 1.0;
  64 static int config_debug_transparent = 0;
  65 static int config_debug_opengl = 0;
  66 /* render improvements */
  67 static int config_improve_extend_roads = 1;     /* set to 1 to extend roads */
  68 static int config_improve_smooth_planets = 1;   /* set to 1 to rotate planets smoothly */
  69
  70 #define CPU_SPEED       7093790.0;
  71
  72 #define SOUND_SAMPLERATE 48000
  73 /* - game IRQ rate
  74  * - must be used for sound rendering chunk
  75  */
  76 #define IRQ_RATE        50
  77 /* numbe of buffer chunks to dejitter:
  78  * - SDL render interval
  79  * - sound rendering interval
  80  * - sound card interval
  81  * 4 should be minimum, if video rate is >=50 Hz
  82  */
  83 #define SOUND_CHUNKS    4
  84
  85 /* test sound to check if buffer does not overflow / underrun */
  86 //#define DEBUG_SOUND_BUFFERING
  87
  88 #define IOSIZE          0x1000 /* bytes in io space */
  89 #define MEMORY_SIZE     0x80000
  90 static uint8_t *memory = NULL;
  91 static uint8_t *stop_event = NULL;
  92 static uint8_t *image = NULL;
  93 static uint8_t *help_osd = NULL;
  94 static uint8_t *info_osd = NULL;
  95 static int help_view = 1;
  96 static int32_t osd_timer = 0;
  97 #ifdef HAVE_OVR
  98 #define SCREEN_WIDTH    1344
  99 #define SCREEN_HEIGHT   800
 100 #else
 101 #define SCREEN_WIDTH    (320*3)
 102 #define SCREEN_HEIGHT   (200*3)
 103 #endif
 104 #define IMAGE_WIDTH     320
 105 #define IMAGE_HEIGHT    200
 106 #define BENSON_AT_LINE  136
 107 #define IMAGE_DIWSTART  0x2c
 108 #define HELP_ALPHA      0xd0
 109 #define OSD_WIDTH       320
 110 #define OSD_HEIGHT      16
 111 static uint16_t *chipreg = NULL;
 112 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 113 static int sound_buffer_size; /* buffer sample size */
 114 static int sound_buffer_writep; /* write pointer at buffer */
 115 static int sound_buffer_readp; /* read pointer at buffer */
 116 static int double_pixel_size = 1; /* render in double size, so each pixle is 2*2 pixles wide */
 117 static double benson_size; /* render size of benson */
 118 static int render_legacy = 0; /* render original amiga screen, if set */
 119 static int render_improved = 0; /* render improved image, if set */
 120 static int debug_opengl = 0; /* render both, amiga screen and  improved image, if set */
 121 static int intro_skipped = 0; /* indicated if we already have landed */
 122 static int window_width, window_height;
 123
 124 static const char *home_dir;
 125
 126 static int quit = 0;
 127
 128 int parse_args(int argc, char *argv[])
 129 {
 130         int i = 1;
 131
 132         while (argc > i) {
 133                 if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 134                         print_info("Usage: %s\n", argv[0]);
 135                         print_info(" -s --render-speed original | fast\n");
 136                         print_info("        Set speed of rendering to original Amiga or fast speed.\n");
 137                         print_info("    --fps <fps>\n");
 138                         print_info("        Set frames per second for fast rate (default = %.1f).\n", config_fps);
 139                         print_info(" -v --video-filter on | off\n");
 140                         print_info("        Set video filter.\n");
 141                         print_info(" -a --audio-filter on | off\n");
 142                         print_info("        Set audio filter.\n");
 143                         print_info(" -r --render original | opengl\n");
 144                         print_info("        Set speed of rendering to original Amiga or OpenGL.\n");
 145                         print_info(" -b --benson normal | half\n");
 146                         print_info("        Size of 'Benson' (control panel).\n");
 147                         print_info(" -m --multisampling <samples>\n");
 148                         print_info("        Use multisampling (default = %d) to render the scene.\n", config_multisampling);
 149                         print_info(" -f --fov <%.0f..%.0f..%.0f>\n", FOV_MIN, FOV_NOVAGEN, FOV_MAX);
 150                         print_info("        Set field-of-view. Default is %.0f.\n", FOV_NOVAGEN);
 151                         print_info(" -i --skip-intro\n");
 152                         print_info("        Skip intro sequence approaching to Eris space port.\n");
 153                         print_info("Debug options:\n");
 154                         print_info(" -o --debug-opengl\n");
 155                         print_info("        Use split screen to display both Amiga and OpenGL rendering.\n");
 156                         print_info("    --debug-transparent\n");
 157                         print_info("        Draw all things half transparent.\n");
 158                         print_info("    --ctrl-c\n");
 159                         print_info("        Use CTRL+C to exit game (used for development)\n");
 160                         return -1;
 161                 } else
 162                 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
 163                         i++;
 164                         if (argc == i) {
 165 missing_parameter:
 166                                 print_info("Missing parameter, use '--help'!\n");
 167                                 return -1;
 168                         }
 169                         if (!strcmp(argv[i], "original"))
 170                                 config_amiga_speed = 1;
 171                         else
 172                         if (!strcmp(argv[i], "fast"))
 173                                 config_amiga_speed = 0;
 174                         else {
 175 illegal_parameter:
 176                                 print_info("Illegal parameter, use '--help'!\n");
 177                                 return -1;
 178                         }
 179                 } else
 180                 if (!strcmp(argv[i], "--fps")) {
 181                         i++;
 182                         if (argc == i)
 183                                 goto missing_parameter;
 184                         config_fps = atof(argv[i]);
 185                         if (config_fov <= 0.0)
 186                                 goto illegal_parameter;
 187                 } else
 188                 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
 189                         i++;
 190                         if (argc == i)
 191                                 goto missing_parameter;
 192                         if (!strcmp(argv[i], "on"))
 193                                 config_video_filter = 1;
 194                         else
 195                         if (!strcmp(argv[i], "off"))
 196                                 config_video_filter = 0;
 197                         else
 198                                 goto illegal_parameter;
 199                 } else
 200                 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
 201                         i++;
 202                         if (argc == i)
 203                                 goto missing_parameter;
 204                         if (!strcmp(argv[i], "on"))
 205                                 config_audio_filter = 1;
 206                         else
 207                         if (!strcmp(argv[i], "off"))
 208                                 config_audio_filter = 0;
 209                         else
 210                                 goto illegal_parameter;
 211                 } else
 212                 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
 213                         i++;
 214                         if (argc == i)
 215                                 goto missing_parameter;
 216                         if (!strcmp(argv[i], "original"))
 217                                 config_render = 0;
 218                         else
 219                         if (!strcmp(argv[i], "opengl"))
 220                                 config_render = 1;
 221                         else
 222                                 goto illegal_parameter;
 223                 } else
 224                 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
 225                         i++;
 226                         if (argc == i)
 227                                 goto missing_parameter;
 228                         if (!strcmp(argv[i], "normal"))
 229                                 config_benson_size = 1.0;
 230                         else
 231                         if (!strcmp(argv[i], "half")) {
 232                                 config_benson_size = 0.5;
 233                                 if (config_fov == FOV_NOVAGEN)
 234                                         config_fov = FOV_JOLLY;
 235                         } else
 236                                 goto illegal_parameter;
 237                 } else
 238                 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
 239                         i++;
 240                         if (argc == i)
 241                                 goto missing_parameter;
 242                         config_multisampling = atoi(argv[i]);
 243                 } else
 244                 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
 245                         i++;
 246                         if (argc == i)
 247                                 goto missing_parameter;
 248                         config_fov = atof(argv[i]);
 249                         if (config_fov < 1.0 || config_fov > 179.0)
 250                                 goto illegal_parameter;
 251                 } else
 252                 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
 253                         config_skip_intro = 1;
 254                 } else
 255                 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
 256                         config_debug_opengl = 1;
 257                 } else
 258                 if (!strcmp(argv[i], "--debug-transparent")) {
 259                         config_debug_transparent = 1;
 260                 } else
 261                 if (!strcmp(argv[i], "--ctrl-c")) {
 262                         config_ctrl_c = 1;
 263                 } else {
 264                         print_info("Illegal option '%s', use '--help'!\n", argv[i]);
 265                         return -1;
 266                 }
 267                 i++;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static void resize_window(int width, int height)
 274 {
 275         window_width = width;
 276         window_height = height;
 277 }
 278
 279 static void skip_intro(void)
 280 {
 281         int event;
 282         double render_delay = 0.0;
 283         double cycle_count;
 284
 285         if (intro_skipped)
 286                 return;
 287
 288         print_info("*** Skipping intro, fast forwarding... ***\n\n");
 289         do {
 290                 /* render, if not delayed */
 291                 if (render_delay <= 0.0) {
 292                         cycle_count = 0;
 293                         do {
 294                                 cycle_count += execute_cpu(0, &event);
 295                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_CLEAR_SCREEN1);
 296                         render_delay += (double)cycle_count / CPU_SPEED;
 297                 }
 298                 /* VBL */
 299                 execute_cpu(3, NULL);
 300                 /* count down render delay */
 301                 if (render_delay) {
 302                         render_delay -= 1.0 / (double)IRQ_RATE;
 303                         if (render_delay < 0.0)
 304                                 render_delay = 0.0;
 305                 }
 306         } while (event != STOP_AT_CLEAR_SCREEN1);
 307
 308         intro_skipped = 1;
 309 }
 310
 311 static void special_event(int event)
 312 {
 313         if (render_improved)
 314                 render_capture_event(event);
 315 }
 316
 317 static void main_loop(void)
 318 {
 319         double frame_step, frame_time = 0.0, frame_render = 1;
 320         int had_first_irq = 0;
 321         static uint32_t current_time, last_time = 0, diff;
 322         int i, rc;
 323         int space, length;
 324         int cycle_count, event = STOP_AT_END;
 325         double render_delay = 0.0;
 326         uint32_t palette_address;
 327         uint16_t palette[16];
 328         int eye;
 329
 330         last_time = ticks_sdl();
 331
 332         /* render result on window */
 333         while (!quit) {
 334                 /* if we are in interstellar fligt, we use 50 Hz */
 335                 /* if we are approaching to Eris Space Port, we use 10 Hz */
 336                 /* else we use whatever frame rate the user wants */
 337                 if (render_capture_is_interstellar())
 338                         frame_step = vbl_duration * 50.0;
 339                 else if (!intro_skipped)
 340                         frame_step = vbl_duration * 10.0;
 341                 else
 342                         frame_step = vbl_duration * config_fps;
 343                 if (frame_step > 1.0)
 344                         frame_step = 1.0;
 345                 /* handle SDL events */
 346                 rc = event_sdl();
 347                 if (rc)
 348                         break;
 349
 350                 /* initialize rendering */
 351                 debug_opengl = config_debug_opengl;
 352                 benson_size = config_benson_size;
 353                 render_legacy = (!config_render) || debug_opengl;
 354                 render_improved = config_render || debug_opengl;
 355                 if (!render_improved) {
 356                         /* be sure to clean all capture history, so we don't get glichtes when turning on improved rendering again */
 357                         render_capture_reset();
 358                 }
 359                 /* STEP 1: let the CPU render/process the game, also improve rendering via OpenGL, if enabled */
 360                 /* amgia speed: don't render if we still delay */
 361                 /* non amiga speed: render if we need a new frame */
 362                 /* NOTE: at input event we must render after every VBL, so we do this in every loop */
 363                 /* in case of help view: stop cpu after first IRQ, regardless of other options */
 364                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 365                 if (((frame_render && !config_amiga_speed)
 366                   || (config_amiga_speed && render_delay <= 0.0)
 367                   || event == STOP_AT_WAIT_INPUT)
 368                 && !(had_first_irq && help_view)) {
 369                         frame_render = 0;
 370                         /* start capturing for improved graphics */
 371                         if (render_improved)
 372                                 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
 373
 374                         /* execute until the rendered image is ready (wait for VBL) */
 375                         cycle_count = 0;
 376                         do {
 377                                 cycle_count += execute_cpu(0, &event);
 378                                 /* handle special events */
 379                                 special_event(event);
 380                                 if (event == STOP_AT_CLEAR_SCREEN1)
 381                                         intro_skipped = 1;
 382                         } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
 383                         /* stop capturing for improved graphics */
 384                         if (render_improved)
 385                                 render_capture_stop();
 386                         /* copy palette */
 387                         palette_address = mercenary_palette_view();
 388                         for (i = 0; i < 16; i++)
 389                                 palette[i] = m68k_read_memory_16(palette_address + i*2);
 390                         /* for amiga speed: set delay by the number of cycles */
 391                         if (config_amiga_speed)
 392                                 render_delay += (double)cycle_count / CPU_SPEED;
 393                 }
 394
 395                 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
 396 #ifdef HAVE_OVR
 397                 begin_render_ovr();
 398                 for (eye = 0; eye < 2; eye++) {
 399                         /* viewport and frustum is set here */
 400                         begin_render_ovr_eye(eye);
 401 #else
 402                 eye = 0;
 403                 {
 404 #endif
 405                         /* clear screen */
 406 #ifdef HAVE_OVR
 407                         opengl_clear(1);
 408 #else
 409                         opengl_clear(0);
 410 #endif
 411                         /* render benson + osd ontop of improved opengl rendering, if enabled */
 412                         if (render_improved) {
 413 #ifndef HAVE_OVR
 414                                 /* viewport and frustum is set here */
 415                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 2 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size);
 416 #endif
 417                                 /* render improved graphics, interpolate, if required,
 418                                  * if no item list is available, for legacy rendering
 419                                  */
 420 #ifdef HAVE_OVR
 421                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
 422 #else
 423                                 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
 424 #endif
 425                                 if (rc)
 426                                         goto goto_legacy;
 427 #ifdef HAVE_OVR
 428                                 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, 1);
 429 #else
 430                                 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, 0);
 431 #endif
 432                                 if (help_view)
 433                                         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);
 434                                 if (osd_timer) {
 435                                         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);
 436                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 437                                                 osd_timer = 0;
 438                                 }
 439                         }
 440                         /* setup viewport for legacy image and render image, if enabled */
 441                         /* also render legacy, if render_improved failed due to not (yet) available items */
 442                         if (render_legacy) {
 443                                 goto_legacy:
 444                                 /* render game view without benson
 445                                  * because benson is not updated before VBL IRQ, we don't want old image from double buffer
 446                                  */
 447                                 if (had_first_irq)
 448                                         emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 449 #ifndef HAVE_OVR
 450                                 /* viewport and frustum is set here */
 451                                 opengl_viewport(window_width, window_height, (debug_opengl) ? 1 : 0, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, 1.0);
 452 #endif
 453                                 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, 0);
 454                                 if (help_view)
 455                                         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);
 456                                 if (osd_timer) {
 457                                         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);
 458                                         if (osd_timer - (int32_t)ticks_sdl() < 0)
 459                                                 osd_timer = 0;
 460                                 }
 461                         }
 462 #ifdef HAVE_OVR
 463                         end_render_ovr_eye(eye);
 464                 }
 465                 /* at this point we are ready with our image, so we display */
 466                 end_render_ovr();
 467                 render_mirror_ovr(window_width, window_height);
 468 #else
 469                 }
 470 #endif
 471                 swap_sdl();
 472
 473                 /* advance frame time, if we are not in help view  */
 474                 if (!(had_first_irq && help_view)) {
 475                         frame_time += frame_step;
 476                         if (frame_time >= 1.0) {
 477                                 frame_time -= 1.0;
 478                                 frame_render = 1;
 479                         }
 480                 }
 481
 482                 /* measure frame rate */
 483                 framerate_measure();
 484
 485                 /* STEP 3: execute interrupt at rate of 50Hz, render sound */
 486                 /* only do this, if we are not in help view */
 487                 /* NOTE: We need initial IRQ, so we have out copper list initialized */
 488                 if (!(had_first_irq && help_view)) {
 489                         current_time = ticks_sdl();
 490                         diff = current_time - last_time;
 491                         /* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
 492                         if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
 493                                 diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
 494                                 last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
 495                         }
 496                         while (diff > 1000 / IRQ_RATE) {
 497                                 /* trigger and execute IRQ 3 = VBL */
 498                                 execute_cpu(3, NULL);
 499                                 had_first_irq = 1;
 500                                 /* transfer benson without game view
 501                                  * because we only got benson refreshed during VBL IRQ
 502                                  */
 503                                 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
 504                                 /* render sound to sound buffer
 505                                  * buffer pointer read and write is atomic, so no locking required!
 506                                  */
 507                                 space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
 508                                 if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 509 #ifdef DEBUG_SOUND_BUFFERING
 510                                         fprintf(stderr, "sound buffer overflow\n");
 511 #endif
 512                                         length = space;
 513                                 } else
 514                                         length = SOUND_SAMPLERATE / IRQ_RATE;
 515 #ifdef DEBUG_SOUND_BUFFERING
 516                                 printf("can write %d, write %d\n", space, length);
 517                                 static int cnt = 0;
 518                                 int s;
 519                                 for (s = 0; s < length; s++) {
 520                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
 521                                         sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
 522                                                 = sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
 523                                                 * sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
 524                                                 * sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
 525                                          cnt++;
 526                                 }
 527 #else
 528                                 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 529 #endif
 530                                 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
 531                                 diff -= 1000 / IRQ_RATE;
 532                                 last_time += 1000 / IRQ_RATE;
 533
 534                                 /* count down render delay */
 535                                 if (render_delay) {
 536                                         render_delay -= 1.0 / (double)IRQ_RATE;
 537                                         if (render_delay < 0.0)
 538                                                 render_delay = 0.0;
 539                                 }
 540                         }
 541                 }
 542         }
 543 }
 544
 545 static uint16_t io_read(uint32_t address)
 546 {
 547         uint16_t value = 0xffff;
 548
 549         /* joystick and fire button */
 550         if (address == 0xbfe000 || address == 0xdff00c)
 551                 value &= emulate_joystick_read(address);
 552         /* keyboard */
 553         if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
 554                 value &= emulate_keyboard_read(address);
 555         /* diskette */
 556         if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
 557                 value &= emulate_disk_read(address);
 558
 559         return value;
 560 }
 561
 562 static void io_write(uint32_t address, uint16_t value)
 563 {
 564         /* dmacon and sound registers */
 565         if (address == 0xdff096 || address == 0xdff09a || (address >= 0xdff0a0 && address <= 0xdff0df))
 566                 emulate_sound_write(address, value, SOUND_SAMPLERATE);
 567         if (address == 0xbfd100 || (address >= 0xdff020 && address <= 0xdff024))
 568                 emulate_disk_write(address, value);
 569 }
 570
 571 /* two tracks with 0x1820 words of length */
 572 static uint8_t game_save[2][0x1820 << 1];
 573 static int last_track = 0;
 574
 575 /* game reads track with saved game */
 576 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 577 {
 578         if (length > sizeof(game_save[0])) {
 579                 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
 580                 return;
 581         }
 582
 583         /* if even track is selected, load game */
 584         if (!(track & 1)) {
 585                 char filename[256];
 586                 int gamesave_num = (track - 2) >> 1;
 587                 int got;
 588                 FILE *fp;
 589
 590                 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
 591 #if defined(_WIN32)
 592                 filename[0] = '\0';
 593 #else
 594                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 595                 mkdir(filename, 0777);
 596 #endif
 597                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 598                 fp = fopen(filename, "r");
 599                 if (!fp) {
 600 fail:
 601                         print_info("failed to load game from '%s'\n", filename);
 602                         goto copy;
 603                 }
 604                 got = fread(game_save, sizeof(game_save[0]), 2, fp);
 605                 fclose(fp);
 606                 if (got != 2)
 607                         goto fail;
 608         }
 609
 610 copy:
 611         /* copy track */
 612         memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
 613 }
 614
 615 /* game writes track with saved game */
 616 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
 617 {
 618         /* skip sync info that is provided by game and only relevant for a real disk track */
 619         data += 0x200;
 620         length -= 0x200;
 621
 622         if (length != sizeof(game_save[0])) {
 623                 print_error("saving game state failed, because length of data does not match, please fix!\n");
 624                 return;
 625         }
 626
 627         /* don't save if last track is the same, because disk is written on both sides with the same data */
 628         if (track == last_track) {
 629                 if (memcmp(memory + data, game_save[track & 1], length)) {
 630                         print_error("saving game data on other side of the disk is different, please fix!\n");
 631                 }
 632                 return;
 633         }
 634         last_track = track;
 635
 636         /* save game data */
 637         memcpy(game_save[track & 1], memory + data, length);
 638
 639         /* if done with saving */
 640         if ((track & 1)) {
 641                 char filename[256];
 642                 int gamesave_num = (track - 2) >> 1;
 643                 int wrote;
 644                 FILE *fp;
 645
 646 #if defined(_WIN32)
 647                 filename[0] = '\0';
 648 #else
 649                 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
 650                 mkdir(filename, 0777);
 651 #endif
 652                 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
 653                 fp = fopen(filename, "w");
 654                 if (!fp) {
 655 fail:
 656                         print_error("failed to save game to '%s'\n", filename);
 657                         return;
 658                 }
 659                 print_info("Game state saved to '%s'\n", filename);
 660                 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
 661                 fclose(fp);
 662                 if (wrote != 2)
 663                         goto fail;
 664         }
 665 }
 666
 667 static void osd_info(const char *param, const char *value)
 668 {
 669         char line[41] = "                                        ";
 670
 671         if (param[0]) {
 672                 strncpy(line + 21 - strlen(param), param, strlen(param));
 673                 line[22] = ':';
 674         }
 675         if (strlen(value) > 15) {
 676                 print_error("string too long\n");
 677                 return;
 678         }
 679         strncpy(line + 25, value, strlen(value));
 680         text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
 681         osd_timer = ticks_sdl() + 2500;
 682 }
 683
 684 static int shift = 0, ctrl = 0;
 685
 686 static void keyboard_sdl(int down, enum keycode keycode)
 687 {
 688         switch (keycode) {
 689         case KEYCODE_LCTRL:
 690         case KEYCODE_RCTRL:
 691                 ctrl = down;
 692                 break;
 693         default: break;
 694         }
 695
 696         if (ctrl && down) {
 697                 switch (keycode) {
 698                 case KEYCODE_h:
 699                         help_view ^= 1;
 700                         break;
 701                 case KEYCODE_v:
 702                         config_video_filter ^= 1;
 703                         osd_info("video filter", (config_video_filter) ? "on" : "off");
 704                         break;
 705                 case KEYCODE_a:
 706                         config_audio_filter ^= 1;
 707                         osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 708                         break;
 709                 case KEYCODE_s:
 710                         config_amiga_speed ^= 1;
 711                         osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 712                         break;
 713                 case KEYCODE_r:
 714                         config_render ^= 1;
 715                         osd_info("render mode", (config_render) ? "OpenGL" : "original");
 716                         break;
 717                 case KEYCODE_b:
 718                         if (!config_render && !config_debug_opengl) {
 719                                 osd_info("", "not applicable");
 720                                 break;
 721                         }
 722                         if (config_benson_size == 0.5) {
 723                                 config_benson_size = 1.0;
 724                                 config_fov = FOV_NOVAGEN;
 725                         } else {
 726                                 config_benson_size = 0.5;
 727                                 config_fov = FOV_JOLLY;
 728                         }
 729                         osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 730                         break;
 731                 case KEYCODE_i:
 732                         if (!intro_skipped)
 733                                 skip_intro();
 734                         else
 735                                 osd_info("", "not applicable");
 736                         break;
 737                 case KEYCODE_c:
 738                         if (config_ctrl_c)
 739                                 quit = 1;
 740                         break;
 741                 case KEYCODE_n:
 742 #ifdef HAVE_OVR
 743                         normalize_observer_ovr();
 744                         osd_info("", "change height");
 745 #else
 746                         osd_info("", "not applicable");
 747 #endif
 748                         break;
 749                 case KEYCODE_KP_PLUS:
 750                         if (config_fov / 1.2 >= FOV_MIN)
 751                                 config_fov /= 1.2;
 752                         disp_fov:
 753                         {
 754                                 char text[16];
 755                                 sprintf(text, "%.2f", config_fov);
 756                                 osd_info("FOV", text);
 757                         }
 758                         break;
 759                 case KEYCODE_KP_MINUS:
 760                         if (config_fov * 1.2 <= FOV_MAX)
 761                                 config_fov *= 1.2;
 762                         goto disp_fov;
 763                 default: break;
 764                 }
 765                 /* do not pass keys to game while holding CTRL */
 766                 return;
 767         }
 768
 769         if (keycode == KEYCODE_PAUSE && down)
 770                 help_view ^= 1;
 771
 772         /* in help view we must not forward keypresses */
 773         if (help_view)
 774                 return;
 775
 776         switch (keycode) {
 777         case KEYCODE_LSHIFT:
 778                 set_amiga_key(keycode, down);
 779                 shift = down;
 780                 break;
 781         case KEYCODE_RSHIFT:
 782                 set_amiga_key(keycode, down);
 783                 shift = down;
 784                 break;
 785         case KEYCODE_LEFT:
 786                 if (shift && down) {
 787                         set_amiga_key(keycode, down);
 788                         set_joystick(-1, -1, -1, -1, -1);
 789                         break;
 790                 }
 791                 set_amiga_key(keycode, 0);
 792                 set_joystick(down, -1, -1, -1, -1);
 793                 break;
 794         case KEYCODE_RIGHT:
 795                 if (shift && down) {
 796                         set_amiga_key(keycode, down);
 797                         set_joystick(-1, -1, -1, -1, -1);
 798                         break;
 799                 }
 800                 set_amiga_key(keycode, 0);
 801                 set_joystick(-1, down, -1, -1, -1);
 802                 break;
 803         case KEYCODE_UP:
 804                 if (shift && down) {
 805                         set_amiga_key(keycode, down);
 806                         set_joystick(-1, -1, -1, -1, -1);
 807                         break;
 808                 }
 809                 set_amiga_key(keycode, 0);
 810                 set_joystick(-1, -1, down, -1, -1);
 811                 break;
 812         case KEYCODE_DOWN:
 813                 if (shift && down) {
 814                         set_amiga_key(keycode, down);
 815                         set_joystick(-1, -1, -1, -1, -1);
 816                         break;
 817                 }
 818                 set_amiga_key(keycode, 0);
 819                 set_joystick(-1, -1, -1, down, -1);
 820                 break;
 821         case KEYCODE_END:
 822                 set_joystick(-1, -1, -1, -1, down);
 823                 break;
 824         case KEYCODE_INSERT:
 825                 set_amiga_key(KEYCODE_HELP, down);
 826                 break;
 827         default:
 828                 set_amiga_key(keycode, down);
 829         }
 830 }
 831
 832 void audio_sdl(float *data, int length)
 833 {
 834         int fill, s;
 835
 836         /* read sound from sound buffer
 837          * buffer pointer read and write is atomic, so no locking required!
 838          */
 839         fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
 840         if (fill < length) {
 841 #ifdef DEBUG_SOUND_BUFFERING
 842                 fprintf(stderr, "sound buffer underrun\n");
 843 #endif
 844                 /* correct read pointer as if the buffer would have 'length' of samples stored inside */
 845                 sound_buffer_readp = (sound_buffer_readp + fill - length + sound_buffer_size) % sound_buffer_size;
 846         }
 847         for (s = 0; s < length; s++) {
 848                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].left;
 849                 *data++ = sound_buffer[(sound_buffer_readp + s) % sound_buffer_size].right;
 850         }
 851 #ifdef DEBUG_SOUND_BUFFERING
 852         printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
 853 #endif
 854         sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
 855 }
 856
 857 void sound_irq(void)
 858 {
 859         /* trigger and execute IRQ 4 = sound */
 860         execute_cpu(4, NULL);
 861 }
 862
 863 int main(int argc, char *argv[])
 864 {
 865         int rc;
 866         int sdl_sound_chunk;
 867
 868         home_dir = getenv("HOME");
 869         if (!home_dir)
 870                 home_dir = "";
 871
 872         rc = parse_args(argc, argv);
 873         if (rc)
 874                 return 0;
 875
 876         /* allocate image */
 877         image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
 878         if (!image) {
 879                 print_error("Failed to allocate image buffer\n");
 880                 goto done;
 881         }
 882
 883         if ((SOUND_SAMPLERATE % IRQ_RATE)) {
 884                 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
 885                 goto done;
 886         }
 887         if ((1000 % IRQ_RATE)) {
 888                 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
 889                 goto done;
 890         }
 891
 892         /* calculate SDL chunk size for audio
 893          * it must be a power of two, but not more than the chunk size for each IRQ!
 894          */
 895         for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
 896                 ;
 897         sdl_sound_chunk >>= 1;
 898 //      printf("samples per IRQ = %d, samples per SDL audio = %d\n", SOUND_SAMPLERATE / IRQ_RATE, sdl_sound_chunk); exit(0);
 899
 900         /* allocate sound buffers */
 901         sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
 902         sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
 903         if (!sound_buffer) {
 904                 print_error("Failed to allocate image buffer\n");
 905                 goto done;
 906         }
 907
 908         /* allocate memory */
 909         memory = calloc(MEMORY_SIZE, 1);
 910         if (!memory) {
 911                 print_error("Failed to allocate cpu's memory\n");
 912                 goto done;
 913         }
 914         stop_event = calloc(MEMORY_SIZE, 1);
 915         if (!stop_event) {
 916                 print_error("Failed to allocate cpu's stop_event memory\n");
 917                 goto done;
 918         }
 919         chipreg = calloc(IOSIZE, 1);
 920         if (!chipreg) {
 921                 print_error("Failed to allocate chip register\n");
 922                 goto done;
 923         }
 924
 925         /* init cpu code */
 926         execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
 927
 928         /* init disk emulation */
 929         disk_init(disk_read, disk_write);
 930
 931         /* load binary */
 932         mercenary_load();
 933
 934         /* patch some stuff */
 935         mercenary_patch();
 936
 937         /* init SDL and OpenGL */
 938 #ifdef HAVE_OVR
 939         int vbl_sync = 0;
 940         int rift = 1;
 941         int multisampling = 0;
 942         window_width = SCREEN_WIDTH;
 943         window_height = SCREEN_HEIGHT;
 944 #else
 945         int vbl_sync = 1;
 946         int rift = 0;
 947         int multisampling = config_multisampling;
 948         window_width = (config_debug_opengl) ? SCREEN_WIDTH / 3 * 2 : SCREEN_WIDTH;
 949         window_height = (config_debug_opengl) ? SCREEN_HEIGHT / 3 * 4 : SCREEN_HEIGHT;
 950 #endif
 951         rc = init_sdl(argv[0], window_width, window_height, SOUND_SAMPLERATE, sdl_sound_chunk, keyboard_sdl, audio_sdl, resize_window, multisampling, vbl_sync, rift);
 952         if (rc < 0)
 953                 goto done;
 954 #ifdef HAVE_OVR
 955         rc = init_ovr(config_multisampling);
 956         if (rc < 0)
 957                 goto done;
 958 #endif
 959         rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
 960         if (rc < 0)
 961                 goto done;
 962
 963         /* init osd */
 964         rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
 965         if (rc < 0)
 966                 goto done;
 967         rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
 968         if (rc < 0)
 969                 goto done;
 970         help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
 971         if (!help_osd)
 972                 goto done;
 973         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
 974         text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
 975                 "Emulation:\n"
 976                 "        Press `PAUSE' to toggle this help screen on or off.\n"
 977                 "        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
 978                 "        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
 979                 "        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
 980                 "        Press `CTRL' + `B' to toggle between large / small Benson.\n"
 981                 "        Press `CTRL' + `V' to toggle video filter on / off.\n"
 982                 "        Press `CTRL' + `A' to toggle audio filter on / off.\n"
 983                 "        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
 984                 "        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
 985 #ifdef HAVE_OVR
 986                 "        Press `CTRL' + `N' to normalize player position.\n"
 987 #endif
 988                 "\n"
 989                 "Answer to a Question:\n"
 990                 "        Press `O' (not Zero) for OK and other key for NO.\n"
 991                 "\n"
 992                 "Walking / Driving / Flying:\n"
 993                 "        Use cursor keys as joystick, to move player / craft.\n"
 994                 "        Press `R' for running, 'W' for walking speed.\n"
 995                 "        Press `B' to board, `L' to leave.\n"
 996                 "        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
 997                 "        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
 998                 "        Press `SPACE' to stop craft.\n"
 999                 "        Press `ESCAPE' to activate escape sequence on crafts.\n"
1000                 "        Press `T' for turbo on certain craft.\n"
1001                 "        Press `END' as joystick's fire button.\n"
1002                 "\n"
1003                 "Elevator:\n"
1004                 "        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1005                 "\n"
1006                 "Inside a transporter:\n"
1007                 "        Press `1'...`0' to select destination.\n"
1008                 "\n"
1009                 "Items:\n"
1010                 "        Press `SHFIT' + cursor left / right keys to choose item.\n"
1011                 "        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
1012                 "        Press `NUMPAD Enter' to select certain items.\n"
1013                 "        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
1014                 "        Press `NUMPAD *' to read entry\n"
1015                 "Saving / Loading / Pause:\n"
1016                 "        Press `INSERT' to loading and saving options.\n"
1017                 "        Press `ENTER' to pause game, other key to continue.\n"
1018                 ,HELP_ALPHA, 1, 2, 5, 0);
1019         info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
1020         if (!info_osd)
1021                 goto done;
1022
1023         /* init audio */
1024         sound_init(SOUND_SAMPLERATE, sound_irq);
1025
1026         /* start cpu */
1027         reset_cpu();
1028
1029         if (config_skip_intro)
1030                 skip_intro();
1031
1032         /* run game */
1033         main_loop();
1034
1035 done:
1036         exit_opengl();
1037 #ifdef HAVE_OVR
1038         exit_ovr();
1039 #endif
1040         exit_sdl();
1041
1042         if (chipreg)
1043                 free(chipreg);
1044         if (stop_event)
1045                 free(stop_event);
1046         if (memory)
1047                 free(memory);
1048         if (sound_buffer)
1049                 free(sound_buffer);
1050         if (image)
1051                 free(image);
1052         if (help_osd)
1053                 free(help_osd);
1054         if (info_osd)
1055                 free(info_osd);
1056
1057         return 0;
1058 }
1059