~rabbits/uxn

ref: 6829863d6d6557e67a1f3678d368928b7637ccc3 uxn/src/emulator.c -rw-r--r-- 9.7 KiB
6829863dAndrew Alderwick Changed samples from s8 to u8 format 7 months ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
#include <SDL2/SDL.h>
#include <stdio.h>
#include <time.h>

/*
Copyright (c) 2021 Devine Lu Linvega

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

#include "uxn.h"
#include "ppu.h"
#include "apu.h"
#include "mpu.h"

static SDL_AudioDeviceID audio_id;
static SDL_Window *gWindow;
static SDL_Renderer *gRenderer;
static SDL_Texture *gTexture;
static Ppu ppu;
static Apu apu[POLYPHONY];
static Mpu mpu;
static Device *devscreen, *devmouse, *devctrl, *devmidi, *devaudio0;

Uint8 zoom = 0, debug = 0, reqdraw = 0;

int
clamp(int val, int min, int max)
{
	return (val >= min) ? (val <= max) ? val : max : min;
}

int
error(char *msg, const char *err)
{
	printf("Error %s: %s\n", msg, err);
	return 0;
}

static void
audio_callback(void *u, Uint8 *stream, int len)
{
	int i;
	Sint16 *samples = (Sint16 *)stream;
	SDL_memset(stream, 0, len);
	for(i = 0; i < POLYPHONY; ++i)
		apu_render(&apu[i], samples, samples + len / 2);
	(void)u;
}

void
redraw(Uint32 *dst, Uxn *u)
{
	drawppu(&ppu);
	if(debug)
		drawdebugger(&ppu, u->wst.dat, u->wst.ptr);
	SDL_UpdateTexture(gTexture, NULL, dst, ppu.width * sizeof(Uint32));
	SDL_RenderClear(gRenderer);
	SDL_RenderCopy(gRenderer, gTexture, NULL, NULL);
	SDL_RenderPresent(gRenderer);
	reqdraw = 0;
}

void
toggledebug(Uxn *u)
{
	debug = !debug;
	redraw(ppu.output, u);
}

void
togglezoom(Uxn *u)
{
	zoom = zoom == 3 ? 1 : zoom + 1;
	SDL_SetWindowSize(gWindow, ppu.width * zoom, ppu.height * zoom);
	redraw(ppu.output, u);
}

void
quit(void)
{
	free(ppu.output);
	free(ppu.fg);
	free(ppu.bg);
	SDL_UnlockAudioDevice(audio_id);
	SDL_DestroyTexture(gTexture);
	gTexture = NULL;
	SDL_DestroyRenderer(gRenderer);
	gRenderer = NULL;
	SDL_DestroyWindow(gWindow);
	gWindow = NULL;
	SDL_Quit();
	exit(0);
}

int
init(void)
{
	SDL_AudioSpec as;
	if(!initppu(&ppu, 48, 32, 16))
		return error("PPU", "Init failure");
	if(!initmpu(&mpu, 1))
		return error("MPU", "Init failure");
	if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
		return error("Init", SDL_GetError());
	gWindow = SDL_CreateWindow("Uxn", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, ppu.width * zoom, ppu.height * zoom, SDL_WINDOW_SHOWN);
	if(gWindow == NULL)
		return error("Window", SDL_GetError());
	gRenderer = SDL_CreateRenderer(gWindow, -1, 0);
	if(gRenderer == NULL)
		return error("Renderer", SDL_GetError());
	gTexture = SDL_CreateTexture(gRenderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, ppu.width, ppu.height);
	if(gTexture == NULL)
		return error("Texture", SDL_GetError());
	SDL_StartTextInput();
	SDL_ShowCursor(SDL_DISABLE);
	SDL_zero(as);
	as.freq = SAMPLE_FREQUENCY;
	as.format = AUDIO_S16;
	as.channels = 2;
	as.callback = audio_callback;
	as.samples = 512;
	as.userdata = NULL;
	audio_id = SDL_OpenAudioDevice(NULL, 0, &as, NULL, 0);
	if(!audio_id)
		return error("Audio", SDL_GetError());
	SDL_PauseAudioDevice(audio_id, 0);
	return 1;
}

void
domouse(SDL_Event *event)
{
	Uint8 flag = 0x00;
	Uint16 x = clamp(event->motion.x / zoom - ppu.pad, 0, ppu.hor * 8 - 1);
	Uint16 y = clamp(event->motion.y / zoom - ppu.pad, 0, ppu.ver * 8 - 1);
	mempoke16(devmouse->dat, 0x2, x);
	mempoke16(devmouse->dat, 0x4, y);
	devmouse->dat[7] = 0x00;
	switch(event->button.button) {
	case SDL_BUTTON_LEFT: flag = 0x01; break;
	case SDL_BUTTON_RIGHT: flag = 0x10; break;
	}
	switch(event->type) {
	case SDL_MOUSEBUTTONDOWN:
		devmouse->dat[6] |= flag;
		if(flag == 0x10 && (devmouse->dat[6] & 0x01))
			devmouse->dat[7] = 0x01;
		if(flag == 0x01 && (devmouse->dat[6] & 0x10))
			devmouse->dat[7] = 0x10;
		break;
	case SDL_MOUSEBUTTONUP:
		devmouse->dat[6] &= (~flag);
		break;
	}
}

void
doctrl(Uxn *u, SDL_Event *event, int z)
{
	Uint8 flag = 0x00;
	if(z && event->key.keysym.sym == SDLK_h) {
		if(SDL_GetModState() & KMOD_LCTRL)
			toggledebug(u);
		if(SDL_GetModState() & KMOD_LALT)
			togglezoom(u);
	}
	switch(event->key.keysym.sym) {
	case SDLK_LCTRL: flag = 0x01; break;
	case SDLK_LALT: flag = 0x02; break;
	case SDLK_LSHIFT: flag = 0x04; break;
	case SDLK_ESCAPE: flag = 0x08; break;
	case SDLK_UP: flag = 0x10; break;
	case SDLK_DOWN: flag = 0x20; break;
	case SDLK_LEFT: flag = 0x40; break;
	case SDLK_RIGHT: flag = 0x80; break;
	}
	if(flag && z)
		devctrl->dat[2] |= flag;
	else if(flag)
		devctrl->dat[2] &= (~flag);
	if(z && event->key.keysym.sym < 20)
		devctrl->dat[3] = event->key.keysym.sym;
}

#pragma mark - Devices

void
system_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(!w) {
		d->dat[0x2] = d->u->wst.ptr;
		d->dat[0x3] = d->u->rst.ptr;
	} else {
		putcolors(&ppu, &d->dat[0x8]);
		reqdraw = 1;
	}
	(void)b0;
}

void
console_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(!w) return;
	switch(b0) {
	case 0x8: printf("%c", d->dat[0x8]); break;
	case 0x9: printf("0x%02x", d->dat[0x9]); break;
	case 0xb: printf("0x%04x", mempeek16(d->dat, 0xa)); break;
	case 0xd: printf("%s", &d->mem[mempeek16(d->dat, 0xc)]); break;
	}
	fflush(stdout);
}

void
screen_talk(Device *d, Uint8 b0, Uint8 w)
{
	if(w && b0 == 0xe) {
		Uint16 x = mempeek16(d->dat, 0x8);
		Uint16 y = mempeek16(d->dat, 0xa);
		Uint8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
		Uint8 *layer = d->dat[0xe] >> 4 & 0x1 ? ppu.fg : ppu.bg;
		Uint8 mode = d->dat[0xe] >> 5;
		if(!mode)
			putpixel(&ppu, layer, x, y, d->dat[0xe] & 0x3);
		else if(mode-- & 0x1)
			puticn(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf, mode & 0x2, mode & 0x4);
		else
			putchr(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf, mode & 0x2, mode & 0x4);

		reqdraw = 1;
	}
}

void
file_talk(Device *d, Uint8 b0, Uint8 w)
{
	Uint8 read = b0 == 0xd;
	if(w && (read || b0 == 0xf)) {
		char *name = (char *)&d->mem[mempeek16(d->dat, 0x8)];
		Uint16 result = 0, length = mempeek16(d->dat, 0xa);
		Uint16 offset = mempeek16(d->dat, 0x4);
		Uint16 addr = mempeek16(d->dat, b0 - 1);
		FILE *f = fopen(name, read ? "r" : (offset ? "a" : "w"));
		if(f) {
			if(fseek(f, offset, SEEK_SET) != -1 && (result = read ? fread(&d->mem[addr], 1, length, f) : fwrite(&d->mem[addr], 1, length, f)))
				printf("%s %d bytes, at %04x from %s\n", read ? "Loaded" : "Saved", length, addr, name);
			fclose(f);
		}
		mempoke16(d->dat, 0x2, result);
	}
}

static void
audio_talk(Device *d, Uint8 b0, Uint8 w)
{
	Apu *c = &apu[d - devaudio0];
	if(!w) {
		if(b0 == 0x2)
			mempoke16(d->dat, 0x2, c->i);
		else if(b0 == 0x4)
			d->dat[0x4] = apu_get_vu(c);
	} else if(b0 == 0xf) {
		SDL_LockAudioDevice(audio_id);
		c->len = mempeek16(d->dat, 0xa);
		c->addr = &d->mem[mempeek16(d->dat, 0xc)];
		c->volume[0] = d->dat[0xe] >> 4;
		c->volume[1] = d->dat[0xe] & 0xf;
		c->repeat = !(d->dat[0xf] & 0x80);
		apu_start(c, mempeek16(d->dat, 0x8), d->dat[0xf] & 0x7f);
		SDL_UnlockAudioDevice(audio_id);
	}
}

void
datetime_talk(Device *d, Uint8 b0, Uint8 w)
{
	time_t seconds = time(NULL);
	struct tm *t = localtime(&seconds);
	t->tm_year += 1900;
	mempoke16(d->dat, 0x0, t->tm_year);
	d->dat[0x2] = t->tm_mon;
	d->dat[0x3] = t->tm_mday;
	d->dat[0x4] = t->tm_hour;
	d->dat[0x5] = t->tm_min;
	d->dat[0x6] = t->tm_sec;
	d->dat[0x7] = t->tm_wday;
	mempoke16(d->dat, 0x08, t->tm_yday);
	d->dat[0xa] = t->tm_isdst;
	(void)b0;
	(void)w;
}

void
midi_talk(Device *d, Uint8 b0, Uint8 w)
{
	(void)d;
	(void)b0;
	(void)w;
}

void
nil_talk(Device *d, Uint8 b0, Uint8 w)
{
	(void)d;
	(void)b0;
	(void)w;
}

#pragma mark - Generics

int
start(Uxn *u)
{
	evaluxn(u, 0x0100);
	redraw(ppu.output, u);
	while(1) {
		int i;
		SDL_Event event;
		double elapsed, start = SDL_GetPerformanceCounter();
		while(SDL_PollEvent(&event) != 0) {
			switch(event.type) {
			case SDL_QUIT:
				quit();
				break;
			case SDL_TEXTINPUT:
				if(event.text.text[0] >= ' ' || event.text.text[0] <= '~')
					devctrl->dat[3] = event.text.text[0];
				break;
			case SDL_KEYDOWN:
			case SDL_KEYUP:
				doctrl(u, &event, event.type == SDL_KEYDOWN);
				evaluxn(u, mempeek16(devctrl->dat, 0));
				devctrl->dat[3] = 0;
				break;
			case SDL_MOUSEBUTTONUP:
			case SDL_MOUSEBUTTONDOWN:
			case SDL_MOUSEMOTION:
				domouse(&event);
				evaluxn(u, mempeek16(devmouse->dat, 0));
				break;
			case SDL_WINDOWEVENT:
				if(event.window.event == SDL_WINDOWEVENT_EXPOSED)
					redraw(ppu.output, u);
				break;
			}
		}
		listenmpu(&mpu);
		for(i = 0; i < mpu.queue; ++i) {
			devmidi->dat[2] = mpu.events[i].message;
			devmidi->dat[3] = mpu.events[i].message >> 8;
			devmidi->dat[4] = mpu.events[i].message >> 16;
			evaluxn(u, mempeek16(devmidi->dat, 0));
		}
		evaluxn(u, mempeek16(devscreen->dat, 0));
		if(reqdraw)
			redraw(ppu.output, u);
		elapsed = (SDL_GetPerformanceCounter() - start) / (double)SDL_GetPerformanceFrequency() * 1000.0f;
		SDL_Delay(clamp(16.666f - elapsed, 0, 1000));
	}
	return 1;
}

int
main(int argc, char **argv)
{
	Uxn u;
	zoom = 2;

	if(argc < 2)
		return error("Input", "Missing");
	if(!bootuxn(&u))
		return error("Boot", "Failed");
	if(!loaduxn(&u, argv[1]))
		return error("Load", "Failed");
	if(!init())
		return error("Init", "Failed");

	portuxn(&u, 0x0, "system", system_talk);
	portuxn(&u, 0x1, "console", console_talk);
	devscreen = portuxn(&u, 0x2, "screen", screen_talk);
	devaudio0 = portuxn(&u, 0x3, "audio0", audio_talk);
	portuxn(&u, 0x4, "audio1", audio_talk);
	portuxn(&u, 0x5, "audio2", audio_talk);
	portuxn(&u, 0x6, "audio3", audio_talk);
	devmidi = portuxn(&u, 0x7, "midi", midi_talk);
	devctrl = portuxn(&u, 0x8, "controller", nil_talk);
	devmouse = portuxn(&u, 0x9, "mouse", nil_talk);
	portuxn(&u, 0xa, "file", file_talk);
	portuxn(&u, 0xb, "datetime", datetime_talk);
	portuxn(&u, 0xc, "---", nil_talk);
	portuxn(&u, 0xd, "---", nil_talk);
	portuxn(&u, 0xe, "---", nil_talk);
	portuxn(&u, 0xf, "---", nil_talk);

	/* Write screen size to dev/screen */
	mempoke16(devscreen->dat, 2, ppu.hor * 8);
	mempoke16(devscreen->dat, 4, ppu.ver * 8);

	start(&u);
	quit();
	return 0;
}