summaryrefslogtreecommitdiff
path: root/src/rototiller.c
blob: 92f29fe32f478bd50396753112ca758e5639c87e (plain)
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
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>

#include "settings.h"
#include "setup.h"
#include "fb.h"
#include "fps.h"
#include "rototiller.h"
#include "threads.h"
#include "util.h"

/* Copyright (C) 2016 Vito Caputo <vcaputo@pengaru.com> */

#define NUM_FB_PAGES	3
/* ^ By triple-buffering, we can have a page tied up being displayed, another
 * tied up submitted and waiting for vsync, and still not block on getting
 * another page so we can begin rendering another frame before vsync.  With
 * just two pages we end up twiddling thumbs until the vsync arrives.
 */
#define DEFAULT_MODULE	"rtv"
#define DEFAULT_VIDEO	"sdl"

extern fb_ops_t			drm_fb_ops;
extern fb_ops_t			sdl_fb_ops;
fb_ops_t			*fb_ops;

extern rototiller_module_t	flui2d_module;
extern rototiller_module_t	julia_module;
extern rototiller_module_t	pixbounce_module;
extern rototiller_module_t	plasma_module;
extern rototiller_module_t	ray_module;
extern rototiller_module_t	roto_module;
extern rototiller_module_t	rtv_module;
extern rototiller_module_t	snow_module;
extern rototiller_module_t	sparkler_module;
extern rototiller_module_t	stars_module;
extern rototiller_module_t	submit_module;

static const rototiller_module_t	*modules[] = {
	&flui2d_module,
	&julia_module,
	&pixbounce_module,
	&plasma_module,
	&ray_module,
	&roto_module,
	&rtv_module,
	&snow_module,
	&sparkler_module,
	&stars_module,
	&submit_module,
};

typedef struct rototiller_t {
	const rototiller_module_t	*module;
	void				*module_context;
	threads_t			*threads;
	pthread_t			thread;
	fb_t				*fb;
} rototiller_t;

static rototiller_t		rototiller;


const rototiller_module_t * rototiller_lookup_module(const char *name)
{
	assert(name);

	for (size_t i = 0; i < nelems(modules); i++) {
		if (!strcasecmp(name, modules[i]->name))
			return modules[i];
	}

	return NULL;
}


void rototiller_get_modules(const rototiller_module_t ***res_modules, size_t *res_n_modules)
{
	assert(res_modules);
	assert(res_n_modules);

	*res_modules = modules;
	*res_n_modules = nelems(modules);
}


static void module_render_fragment(const rototiller_module_t *module, void *context, threads_t *threads, fb_fragment_t *fragment)
{
	if (module->prepare_frame) {
		rototiller_fragmenter_t	fragmenter;

		module->prepare_frame(context, threads_num_threads(threads), fragment, &fragmenter);

		if (module->render_fragment) {
			threads_frame_submit(threads, fragment, fragmenter, module->render_fragment, context);
			threads_wait_idle(threads);
		}

	} else if (module->render_fragment)
		module->render_fragment(context, fragment);

	if (module->finish_frame)
		module->finish_frame(context, fragment);
}


/* This is a public interface to the threaded module rendering intended for use by
 * modules that wish to get the output of other modules for their own use.
 */
void rototiller_module_render(const rototiller_module_t *module, void *context, fb_fragment_t *fragment)
{
	module_render_fragment(module, context, rototiller.threads, fragment);
}


typedef struct argv_t {
	const char	*module;
	const char	*video;

	unsigned	use_defaults:1;
	unsigned	help:1;
} argv_t;

/*
 * ./rototiller --video=drm,dev=/dev/dri/card3,connector=VGA-1,mode=640x480@60
 * ./rototiller --video=sdl,size=640x480
 * ./rototiller --module=roto,foo=bar,module=settings
 * ./rototiller --defaults
 */
static int parse_argv(int argc, const char *argv[], argv_t *res_args)
{
	int	i;

	assert(argc > 0);
	assert(argv);
	assert(res_args);

	/* this is intentionally being kept very simple, no new dependencies like getopt. */

	for (i = 1; i < argc; i++) {
		if (!strncmp("--video=", argv[i], 8)) {
			res_args->video = &argv[i][8];
		} else if (!strncmp("--module=", argv[i], 9)) {
			res_args->module = &argv[i][9];
		} else if (!strcmp("--defaults", argv[i])) {
			res_args->use_defaults = 1;
		} else if (!strcmp("--help", argv[i])) {
			res_args->help = 1;
		} else {
			return -EINVAL;
		}
	}

	return 0;
}


typedef struct setup_t {
	settings_t	*module;
	settings_t	*video;
} setup_t;

/* FIXME: this is unnecessarily copy-pasta, i think modules should just be made
 * more generic to encompass the setting up uniformly, then basically
 * subclass the video backend vs. renderer stuff.
 */

/* select video backend if not yet selected, then setup the selected backend. */
static int setup_video(settings_t *settings, setting_desc_t **next_setting)
{
	const char	*video;

	/* XXX: there's only one option currently, so this is simple */
	video = settings_get_key(settings, 0);
	if (!video) {
		setting_desc_t	*desc;
		const char	*values[] = {
#ifdef HAVE_DRM
					"drm",
#endif
					"sdl",
					NULL,
				};
		int		r;

		r = setting_desc_clone(&(setting_desc_t){
						.name = "Video Backend",
						.key = NULL,
						.regex = "[a-z]+",
						.preferred = DEFAULT_VIDEO,
						.values = values,
						.annotations = NULL
					}, next_setting);
		if (r < 0)
			return r;

		return 1;
	}

	/* XXX: this is kind of hacky for now */
#ifdef HAVE_DRM
	if (!strcmp(video, "drm")) {
		fb_ops = &drm_fb_ops;

		return drm_fb_ops.setup(settings, next_setting);
	} else
#endif
	if (!strcmp(video, "sdl")) {
		fb_ops = &sdl_fb_ops;

		return sdl_fb_ops.setup(settings, next_setting);
	}

	return -EINVAL;
}


/* select module if not yet selected, then setup the module. */
static int setup_module(settings_t *settings, setting_desc_t **next_setting)
{
	const rototiller_module_t	*module;
	const char			*name;

	name = settings_get_key(settings, 0);
	if (!name) {
		const char	*values[nelems(modules) + 1] = {};
		const char	*annotations[nelems(modules) + 1] = {};
		setting_desc_t	*desc;
		unsigned	i;
		int		r;

		for (i = 0; i < nelems(modules); i++) {
			values[i] = modules[i]->name;
			annotations[i] = modules[i]->description;
		}

		r = setting_desc_clone(&(setting_desc_t){
						.name = "Renderer Module",
						.key = NULL,
						.regex = "[a-zA-Z0-9]+",
						.preferred = DEFAULT_MODULE,
						.values = values,
						.annotations = annotations
					}, next_setting);
		if (r < 0)
			return r;

		return 1;
	}

	module = rototiller_lookup_module(name);
	if (!module)
		return -EINVAL;

	if (module->setup)
		return module->setup(settings, next_setting);

	return 0;
}


/* turn args into settings, automatically applying defaults if appropriate, or interactively if appropriate. */
/* returns negative value on error, 0 when settings unchanged from args, 1 when changed */
static int setup_from_args(argv_t *args, setup_t *res_setup)
{
	int	r, changes = 0;
	setup_t	setup;

	setup.module = settings_new(args->module);
	if (!setup.module)
		return -ENOMEM;

	setup.video = settings_new(args->video);
	if (!setup.video) {
		settings_free(setup.module);

		return -ENOMEM;
	}

	r = setup_interactively(setup.module, setup_module, args->use_defaults);
	if (r < 0) {
		settings_free(setup.module);
		settings_free(setup.video);

		return r;
	}

	if (r)
		changes = 1;

	r = setup_interactively(setup.video, setup_video, args->use_defaults);
	if (r < 0) {
		settings_free(setup.module);
		settings_free(setup.video);

		return r;
	}

	if (r)
		changes = 1;

	*res_setup = setup;

	return changes;
}


static int print_setup_as_args(setup_t *setup)
{
	char	*module_args, *video_args;
	char	buf[64];
	int	r;

	module_args = settings_as_arg(setup->module);
	if (!module_args) {
		r = -ENOMEM;

		goto _out;
	}

	video_args = settings_as_arg(setup->video);
	if (!video_args) {
		r = -ENOMEM;

		goto _out_module;
	}

	r = printf("\nConfigured settings as flags:\n  --module=%s --video=%s\n\nPress enter to continue...\n",
		module_args,
		video_args);

	if (r < 0)
		goto _out_video;

	(void) fgets(buf, sizeof(buf), stdin);

_out_video:
	free(video_args);
_out_module:
	free(module_args);
_out:
	return r;
}


static int print_help(void)
{
	return printf(
		"Run without any flags or partial settings for interactive mode.\n"
		"\n"
		"Supported flags:\n"
		"  --defaults	use defaults for unspecified settings\n"
		"  --help	this help\n"
		"  --module=	module settings\n"
		"  --video=	video settings\n"
		);
}


static void * rototiller_thread(void *_rt)
{
	rototiller_t	*rt = _rt;

	for (;;) {
		fb_page_t	*page;

		page = fb_page_get(rt->fb);
		module_render_fragment(rt->module, rt->module_context, rt->threads, &page->fragment);
		fb_page_put(rt->fb, page);
	}

	return NULL;
}


/* When run with partial/no arguments, if stdin is a tty, enter an interactive setup.
 * If stdin is not a tty, or if --defaults is supplied in argv, default settings are used.
 * If any changes to the settings occur in the course of execution, either interactively or
 * throught --defaults, then print out the explicit CLI invocation usable for reproducing
 * the invocation.
 */
int main(int argc, const char *argv[])
{
	setup_t		setup = {};
	argv_t		args = {};
	int		r;

	exit_if(parse_argv(argc, argv, &args) < 0,
		"unable to process arguments");

	if (args.help)
		return print_help() < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

	exit_if((r = setup_from_args(&args, &setup)) < 0,
		"unable to setup: %s", strerror(-r));

	exit_if(r && print_setup_as_args(&setup) < 0,
		"unable to print setup");

	exit_if(!(rototiller.module = rototiller_lookup_module(settings_get_key(setup.module, 0))),
		"unable to lookup module from settings \"%s\"", settings_get_key(setup.module, 0));

	exit_if(!(rototiller.fb = fb_new(fb_ops, setup.video, NUM_FB_PAGES)),
		"unable to create fb");

	exit_if(!fps_setup(),
		"unable to setup fps counter");

	exit_if(rototiller.module->create_context &&
		!(rototiller.module_context = rototiller.module->create_context()),
		"unable to create module context");

	pexit_if(!(rototiller.threads = threads_create()),
		"unable to create rendering threads");

	pexit_if(pthread_create(&rototiller.thread, NULL, rototiller_thread, &rototiller) != 0,
		"unable to create dispatch thread");

	for (;;) {
		if (fb_flip(rototiller.fb) < 0)
			break;

		fps_print(rototiller.fb);
	}

	pthread_cancel(rototiller.thread);
	pthread_join(rototiller.thread, NULL);
	threads_destroy(rototiller.threads);

	if (rototiller.module_context)
		rototiller.module->destroy_context(rototiller.module_context);

	fb_free(rototiller.fb);

	return EXIT_SUCCESS;
}
© All Rights Reserved