3 * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
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.
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.
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/>.
25 #include <sys/types.h>
26 #include "../../include/keycodes.h"
27 #include "../libsdl/sdl.h"
29 #include "../libovr/ovr.h"
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"
46 #define FOV_NOVAGEN 64.0
47 #define FOV_JOLLY 80.0
50 static int config_ctrl_c = 0;
51 static int config_amiga_speed = 0; /* fast speed */
52 static double config_fps = 16.0;
54 static const char *config_gamesave_dir = ".mercenary";
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 */
70 #define CPU_SPEED 7093790.0;
72 #define SOUND_SAMPLERATE 48000
74 * - must be used for sound rendering chunk
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
83 #define SOUND_CHUNKS 4
85 /* test sound to check if buffer does not overflow / underrun */
86 //#define DEBUG_SOUND_BUFFERING
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;
98 #define SCREEN_WIDTH 1344
99 #define SCREEN_HEIGHT 800
101 #define SCREEN_WIDTH (320*3)
102 #define SCREEN_HEIGHT (200*3)
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;
124 static const char *home_dir;
128 int parse_args(int argc, char *argv[])
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");
162 if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--render-speed")) {
166 print_info("Missing parameter, use '--help'!\n");
169 if (!strcmp(argv[i], "original"))
170 config_amiga_speed = 1;
172 if (!strcmp(argv[i], "fast"))
173 config_amiga_speed = 0;
176 print_info("Illegal parameter, use '--help'!\n");
180 if (!strcmp(argv[i], "--fps")) {
183 goto missing_parameter;
184 config_fps = atof(argv[i]);
185 if (config_fov <= 0.0)
186 goto illegal_parameter;
188 if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
191 goto missing_parameter;
192 if (!strcmp(argv[i], "on"))
193 config_video_filter = 1;
195 if (!strcmp(argv[i], "off"))
196 config_video_filter = 0;
198 goto illegal_parameter;
200 if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
203 goto missing_parameter;
204 if (!strcmp(argv[i], "on"))
205 config_audio_filter = 1;
207 if (!strcmp(argv[i], "off"))
208 config_audio_filter = 0;
210 goto illegal_parameter;
212 if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--render")) {
215 goto missing_parameter;
216 if (!strcmp(argv[i], "original"))
219 if (!strcmp(argv[i], "opengl"))
222 goto illegal_parameter;
224 if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--benson")) {
227 goto missing_parameter;
228 if (!strcmp(argv[i], "normal"))
229 config_benson_size = 1.0;
231 if (!strcmp(argv[i], "half")) {
232 config_benson_size = 0.5;
233 if (config_fov == FOV_NOVAGEN)
234 config_fov = FOV_JOLLY;
236 goto illegal_parameter;
238 if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--multisampling")) {
241 goto missing_parameter;
242 config_multisampling = atoi(argv[i]);
244 if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--fov")) {
247 goto missing_parameter;
248 config_fov = atof(argv[i]);
249 if (config_fov < 1.0 || config_fov > 179.0)
250 goto illegal_parameter;
252 if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--skip-intro")) {
253 config_skip_intro = 1;
255 if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--debug-opengl")) {
256 config_debug_opengl = 1;
258 if (!strcmp(argv[i], "--debug-transparent")) {
259 config_debug_transparent = 1;
261 if (!strcmp(argv[i], "--ctrl-c")) {
264 print_info("Illegal option '%s', use '--help'!\n", argv[i]);
273 static void resize_window(int width, int height)
275 window_width = width;
276 window_height = height;
279 static void skip_intro(void)
282 double render_delay = 0.0;
288 print_info("*** Skipping intro, fast forwarding... ***\n\n");
290 /* render, if not delayed */
291 if (render_delay <= 0.0) {
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;
299 execute_cpu(3, NULL);
300 /* count down render delay */
302 render_delay -= 1.0 / (double)IRQ_RATE;
303 if (render_delay < 0.0)
306 } while (event != STOP_AT_CLEAR_SCREEN1);
311 static void special_event(int event)
314 render_capture_event(event);
317 static void main_loop(void)
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;
324 int cycle_count, event = STOP_AT_END;
325 double render_delay = 0.0;
326 uint32_t palette_address;
327 uint16_t palette[16];
330 last_time = ticks_sdl();
332 /* render result on window */
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;
342 frame_step = vbl_duration * config_fps;
343 if (frame_step > 1.0)
345 /* handle SDL events */
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();
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)) {
370 /* start capturing for improved graphics */
372 render_capture_start(config_fov, config_improve_extend_roads, config_improve_smooth_planets, config_debug_transparent);
374 /* execute until the rendered image is ready (wait for VBL) */
377 cycle_count += execute_cpu(0, &event);
378 /* handle special events */
379 special_event(event);
380 if (event == STOP_AT_CLEAR_SCREEN1)
382 } while (event != STOP_AT_WAIT_VBL && event != STOP_AT_WAIT_INPUT);
383 /* stop capturing for improved graphics */
385 render_capture_stop();
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;
395 /* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
398 for (eye = 0; eye < 2; eye++) {
399 /* viewport and frustum is set here */
400 begin_render_ovr_eye(eye);
411 /* render benson + osd ontop of improved opengl rendering, if enabled */
412 if (render_improved) {
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);
417 /* render improved graphics, interpolate, if required,
418 * if no item list is available, for legacy rendering
421 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 1);
423 rc = render_all_items((config_amiga_speed) ? 1.0 : frame_time, 0);
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);
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);
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);
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)
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 */
444 /* render game view without benson
445 * because benson is not updated before VBL IRQ, we don't want old image from double buffer
448 emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
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);
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);
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);
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)
463 end_render_ovr_eye(eye);
465 /* at this point we are ready with our image, so we display */
467 render_mirror_ovr(window_width, window_height);
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) {
482 /* measure frame rate */
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;
496 while (diff > 1000 / IRQ_RATE) {
497 /* trigger and execute IRQ 3 = VBL */
498 execute_cpu(3, NULL);
500 /* transfer benson without game view
501 * because we only got benson refreshed during VBL IRQ
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!
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");
514 length = SOUND_SAMPLERATE / IRQ_RATE;
515 #ifdef DEBUG_SOUND_BUFFERING
516 printf("can write %d, write %d\n", space, length);
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);
528 render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
530 sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
531 diff -= 1000 / IRQ_RATE;
532 last_time += 1000 / IRQ_RATE;
534 /* count down render delay */
536 render_delay -= 1.0 / (double)IRQ_RATE;
537 if (render_delay < 0.0)
545 static uint16_t io_read(uint32_t address)
547 uint16_t value = 0xffff;
549 /* joystick and fire button */
550 if (address == 0xbfe000 || address == 0xdff00c)
551 value &= emulate_joystick_read(address);
553 if (address == 0xbfec00 || address == 0xbfed00 || address == 0xbfee00)
554 value &= emulate_keyboard_read(address);
556 if (address == 0xbfd100 || address == 0xbfe000 || address == 0xdff01a || address == 0xdff01e)
557 value &= emulate_disk_read(address);
562 static void io_write(uint32_t address, uint16_t value)
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);
571 /* two tracks with 0x1820 words of length */
572 static uint8_t game_save[2][0x1820 << 1];
573 static int last_track = 0;
575 /* game reads track with saved game */
576 static void disk_read(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
578 if (length > sizeof(game_save[0])) {
579 print_error("loading game state failed, because length exceeds game save data size, please fix!\n");
583 /* if even track is selected, load game */
586 int gamesave_num = (track - 2) >> 1;
590 memset(game_save, 0, sizeof(game_save)); /* clear so make the game fail, if we fail */
594 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
595 mkdir(filename, 0777);
597 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
598 fp = fopen(filename, "r");
601 print_info("failed to load game from '%s'\n", filename);
604 got = fread(game_save, sizeof(game_save[0]), 2, fp);
612 memcpy(memory + data, game_save[track & 1], length /* sizeof(game_save[0])*/);
615 /* game writes track with saved game */
616 static void disk_write(int track, int __attribute__((unused)) side, uint32_t data, uint16_t length)
618 /* skip sync info that is provided by game and only relevant for a real disk track */
622 if (length != sizeof(game_save[0])) {
623 print_error("saving game state failed, because length of data does not match, please fix!\n");
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");
637 memcpy(game_save[track & 1], memory + data, length);
639 /* if done with saving */
642 int gamesave_num = (track - 2) >> 1;
649 sprintf(filename, "%s/%s/", home_dir, config_gamesave_dir);
650 mkdir(filename, 0777);
652 sprintf(filename + strlen(filename), "%d%s", gamesave_num, mercenary_gamesavesuffix);
653 fp = fopen(filename, "w");
656 print_error("failed to save game to '%s'\n", filename);
659 print_info("Game state saved to '%s'\n", filename);
660 wrote = fwrite(game_save, sizeof(game_save[0]), 2, fp);
667 static void osd_info(const char *param, const char *value)
672 strncpy(line + 21 - strlen(param), param, strlen(param));
675 if (strlen(value) > 15) {
676 print_error("string too long\n");
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;
684 static int shift = 0, ctrl = 0;
686 static void keyboard_sdl(int down, enum keycode keycode)
702 config_video_filter ^= 1;
703 osd_info("video filter", (config_video_filter) ? "on" : "off");
706 config_audio_filter ^= 1;
707 osd_info("audio filter", (config_audio_filter) ? "on" : "off");
710 config_amiga_speed ^= 1;
711 osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
715 osd_info("render mode", (config_render) ? "OpenGL" : "original");
718 if (!config_render && !config_debug_opengl) {
719 osd_info("", "not applicable");
722 if (config_benson_size == 0.5) {
723 config_benson_size = 1.0;
724 config_fov = FOV_NOVAGEN;
726 config_benson_size = 0.5;
727 config_fov = FOV_JOLLY;
729 osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
735 osd_info("", "not applicable");
743 normalize_observer_ovr();
744 osd_info("", "change height");
746 osd_info("", "not applicable");
749 case KEYCODE_KP_PLUS:
750 if (config_fov / 1.2 >= FOV_MIN)
755 sprintf(text, "%.2f", config_fov);
756 osd_info("FOV", text);
759 case KEYCODE_KP_MINUS:
760 if (config_fov * 1.2 <= FOV_MAX)
765 /* do not pass keys to game while holding CTRL */
769 if (keycode == KEYCODE_PAUSE && down)
772 /* in help view we must not forward keypresses */
778 set_amiga_key(keycode, down);
782 set_amiga_key(keycode, down);
787 set_amiga_key(keycode, down);
788 set_joystick(-1, -1, -1, -1, -1);
791 set_amiga_key(keycode, 0);
792 set_joystick(down, -1, -1, -1, -1);
796 set_amiga_key(keycode, down);
797 set_joystick(-1, -1, -1, -1, -1);
800 set_amiga_key(keycode, 0);
801 set_joystick(-1, down, -1, -1, -1);
805 set_amiga_key(keycode, down);
806 set_joystick(-1, -1, -1, -1, -1);
809 set_amiga_key(keycode, 0);
810 set_joystick(-1, -1, down, -1, -1);
814 set_amiga_key(keycode, down);
815 set_joystick(-1, -1, -1, -1, -1);
818 set_amiga_key(keycode, 0);
819 set_joystick(-1, -1, -1, down, -1);
822 set_joystick(-1, -1, -1, -1, down);
825 set_amiga_key(KEYCODE_HELP, down);
828 set_amiga_key(keycode, down);
832 void audio_sdl(float *data, int length)
836 /* read sound from sound buffer
837 * buffer pointer read and write is atomic, so no locking required!
839 fill = (sound_buffer_writep - sound_buffer_readp + sound_buffer_size) % sound_buffer_size;
841 #ifdef DEBUG_SOUND_BUFFERING
842 fprintf(stderr, "sound buffer underrun\n");
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;
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;
851 #ifdef DEBUG_SOUND_BUFFERING
852 printf("fill %d = %.4f\n", length, sound_buffer[sound_buffer_readp][0]);
854 sound_buffer_readp =(sound_buffer_readp + length) % sound_buffer_size;
859 /* trigger and execute IRQ 4 = sound */
860 execute_cpu(4, NULL);
863 int main(int argc, char *argv[])
868 home_dir = getenv("HOME");
872 rc = parse_args(argc, argv);
877 image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT * ((double_pixel_size) ? 4 : 1), 3);
879 print_error("Failed to allocate image buffer\n");
883 if ((SOUND_SAMPLERATE % IRQ_RATE)) {
884 print_error("Sample rate must be a multiple of IRQ rate, please fix!\n");
887 if ((1000 % IRQ_RATE)) {
888 print_error("1000 (Ticks per second) rate must be a multiple of IRQ rate, please fix!\n");
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!
895 for (sdl_sound_chunk = 2; sdl_sound_chunk <= (SOUND_SAMPLERATE / IRQ_RATE); sdl_sound_chunk <<= 1)
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);
900 /* allocate sound buffers */
901 sound_buffer_size = SOUND_SAMPLERATE / IRQ_RATE * SOUND_CHUNKS;
902 sound_buffer = calloc(sound_buffer_size, sizeof(*sound_buffer));
904 print_error("Failed to allocate image buffer\n");
908 /* allocate memory */
909 memory = calloc(MEMORY_SIZE, 1);
911 print_error("Failed to allocate cpu's memory\n");
914 stop_event = calloc(MEMORY_SIZE, 1);
916 print_error("Failed to allocate cpu's stop_event memory\n");
919 chipreg = calloc(IOSIZE, 1);
921 print_error("Failed to allocate chip register\n");
926 execute_init(MEMORY_SIZE, memory, stop_event, chipreg, io_read, io_write, mercenary_stop_at);
928 /* init disk emulation */
929 disk_init(disk_read, disk_write);
934 /* patch some stuff */
937 /* init SDL and OpenGL */
941 int multisampling = 0;
942 window_width = SCREEN_WIDTH;
943 window_height = SCREEN_HEIGHT;
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;
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);
955 rc = init_ovr(config_multisampling);
959 rc = init_opengl_image((double_pixel_size) ? IMAGE_WIDTH * 2 : IMAGE_WIDTH, (double_pixel_size) ? IMAGE_HEIGHT * 2 : IMAGE_HEIGHT);
964 rc = init_opengl_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
967 rc = init_opengl_osd(1, OSD_WIDTH, OSD_HEIGHT);
970 help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
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,
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"
986 " Press `CTRL' + `N' to normalize player position.\n"
989 "Answer to a Question:\n"
990 " Press `O' (not Zero) for OK and other key for NO.\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"
1004 " Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
1006 "Inside a transporter:\n"
1007 " Press `1'...`0' to select destination.\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);
1024 sound_init(SOUND_SAMPLERATE, sound_irq);
1029 if (config_skip_intro)