summaryrefslogtreecommitdiff
path: root/src/modules/compose/compose.c
blob: 15f62a4bbd5e9bd73214041a5feeddab76722459 (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
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "til.h"
#include "til_fb.h"
#include "til_module_context.h"
#include "til_settings.h"
#include "til_util.h"

/* Copyright (C) 2020 - Vito Caputo <vcaputo@pengaru.com> */

/* This implements a rudimentary compositing module for layering
 * the output from other modules into a single frame.
 */

#define COMPOSE_DEFAULT_LAYER_MODULE	"moire"
#define COMPOSE_DEFAULT_TEXTURE_MODULE	"none"

typedef struct compose_layer_t {
	til_module_context_t	*module_ctxt;
	/* XXX: it's expected that layers will get more settable attributes to stick in here */
} compose_layer_t;

typedef struct compose_context_t {
	til_module_context_t	til_module_context;

	til_fb_fragment_t	texture_fb;
	compose_layer_t		texture;
	size_t			n_layers;
	compose_layer_t		layers[];
} compose_context_t;

typedef struct compose_setup_layer_t {
	til_setup_t		*module_setup;
} compose_setup_layer_t;

typedef struct compose_setup_t {
	til_setup_t		til_setup;
	compose_setup_layer_t	texture;
	size_t			n_layers;
	compose_setup_layer_t	layers[];
} compose_setup_t;

static til_module_context_t * compose_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup);
static void compose_destroy_context(til_module_context_t *context);
static void compose_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr);
static int compose_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup);


til_module_t	compose_module = {
	.create_context = compose_create_context,
	.destroy_context = compose_destroy_context,
	.render_fragment = compose_render_fragment,
	.name = "compose",
	.description = "Layered modules compositor",
	.setup = compose_setup,
};


static til_module_context_t * compose_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
	compose_setup_t		*s = (compose_setup_t *)setup;
	compose_context_t	*ctxt;

	assert(setup);

	ctxt = til_module_context_new(module, sizeof(compose_context_t) + s->n_layers * sizeof(compose_layer_t), stream, seed, ticks, n_cpus, setup);
	if (!ctxt)
		return NULL;

	for (size_t i = 0; i < s->n_layers; i++) {
		const til_module_t	*layer_module;

		layer_module = ((compose_setup_t *)setup)->layers[i].module_setup->creator;
		(void) til_module_create_context(layer_module, stream, rand_r(&seed), ticks, n_cpus, s->layers[i].module_setup, &ctxt->layers[i].module_ctxt); /* TODO: errors */

		ctxt->n_layers++;
	}

	if (((compose_setup_t *)setup)->texture.module_setup) {
		const til_module_t	*texture_module;

		texture_module = ((compose_setup_t *)setup)->texture.module_setup->creator;
		(void) til_module_create_context(texture_module, stream, rand_r(&seed), ticks, n_cpus, s->texture.module_setup, &ctxt->texture.module_ctxt); /* TODO: errors */
	}

	return &ctxt->til_module_context;
}


static void compose_destroy_context(til_module_context_t *context)
{
	compose_context_t	*ctxt = (compose_context_t *)context;

	for (size_t i = 0; i < ctxt->n_layers; i++)
		til_module_context_free(ctxt->layers[i].module_ctxt);

	til_module_context_free(ctxt->texture.module_ctxt);
	free(ctxt->texture_fb.buf);
	free(context);
}


static void compose_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
{
	compose_context_t	*ctxt = (compose_context_t *)context;
	til_fb_fragment_t	*fragment = *fragment_ptr, *texture = &ctxt->texture_fb;
	til_fb_fragment_t	*old_texture = fragment->texture;

	if (ctxt->texture.module_ctxt) {
		if (!ctxt->texture_fb.buf ||
		    ctxt->texture_fb.frame_width != fragment->frame_width ||
		    ctxt->texture_fb.frame_height != fragment->frame_height) {

			ctxt->texture_fb =	(til_fb_fragment_t){
							.buf = realloc(ctxt->texture_fb.buf, fragment->frame_height * fragment->frame_width * sizeof(uint32_t)),

							.frame_width = fragment->frame_width,
							.frame_height = fragment->frame_height,
							.width = fragment->frame_width,
							.height = fragment->frame_height,
							.pitch = fragment->frame_width,
						};
		}

		ctxt->texture_fb.cleared = 0;
		/* XXX: if when snapshotting becomes a thing, ctxt->texture_fb is snapshottable, this will likely break as-is */
		til_module_render(ctxt->texture.module_ctxt, stream, ticks, &texture);
		til_module_render(ctxt->layers[0].module_ctxt, stream, ticks, &fragment);

		for (size_t i = 1; i < ctxt->n_layers; i++) {
			fragment->texture = texture; /* keep forcing our texture, in case something below us installed their own. */
			til_module_render(ctxt->layers[i].module_ctxt, stream, ticks, &fragment);
		}
	} else {
		for (size_t i = 0; i < ctxt->n_layers; i++) {
			fragment->texture = NULL; /* keep forcing no texture, in case something below us installed their own. TODO: more formally define texture semantics as it pertains to module nesting */
			til_module_render(ctxt->layers[i].module_ctxt, stream, ticks, &fragment);
		}
	}

	fragment->texture = old_texture;
	*fragment_ptr = fragment;
}


/* return a randomized valid layers= setting */
static char * compose_random_layers_setting(unsigned seed)
{
	size_t			n_modules, n_rand_overlays, n_overlayable = 0, n_unusable = 0, base_idx;
	char			*layers = NULL;
	const til_module_t	**modules;
	unsigned		unusable_flags = (TIL_MODULE_HERMETIC | TIL_MODULE_EXPERIMENTAL | TIL_MODULE_BUILTIN);

	til_get_modules(&modules, &n_modules);

	for (size_t i = 0; i < n_modules; i++) {
		if ((modules[i]->flags & unusable_flags) ||
		    modules[i] == &compose_module) {
			n_unusable++;

			continue;
		}

		if (modules[i]->flags & TIL_MODULE_OVERLAYABLE)
			n_overlayable++;
	}

	base_idx = rand_r(&seed) % (n_modules - (n_overlayable + n_unusable));
	for (size_t i = 0, j = 0; !layers && i < n_modules; i++) {
		if ((modules[i]->flags & unusable_flags) ||
		    modules[i] == &compose_module)
			continue;

		if (modules[i]->flags & TIL_MODULE_OVERLAYABLE)
			continue;

		if (j++ == base_idx)
			layers = strdup(modules[i]->name);
	}

	/* TODO FIXME: this doesn't prevent duplicate overlays in the random set,
	 * which generally is undesirable - but actually watching the results, is
	 * sometimes interesting.  Maybe another module flag is necessary for indicating
	 * manifold-appropriate overlays.
	 */
	n_rand_overlays = 1 + (rand_r(&seed) % (n_overlayable - 1));
	for (size_t n = 0; n < n_rand_overlays; n++) {
		size_t	rand_idx = rand_r(&seed) % n_overlayable;

		for (size_t i = 0, j = 0; i < n_modules; i++) {
			if ((modules[i]->flags & unusable_flags) ||
			    modules[i] == &compose_module)
				continue;

			if (!(modules[i]->flags & TIL_MODULE_OVERLAYABLE))
				continue;

			if (j++ == rand_idx) {
				char	*new;

				new = realloc(layers, strlen(layers) + 1 + strlen(modules[i]->name) + 1);
				if (!new) {
					free(layers);
					return NULL;
				}

				strcat(new, ",");
				strcat(new, modules[i]->name);
				layers = new;

				break;
			}
		}
	}

	return layers;
}


static void compose_setup_free(til_setup_t *setup)
{
	compose_setup_t	*s = (compose_setup_t *)setup;

	for (size_t i = 0; i < s->n_layers; i++)
		til_setup_free(s->layers[i].module_setup);

	til_setup_free(s->texture.module_setup);
	free(setup);
}


static int compose_layer_module_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
	const char	*exclusions[] = { "none", NULL };

	return til_module_setup_full(settings,
				     res_setting,
				     res_desc,
				     res_setup,
				     "Layer module name",
				     COMPOSE_DEFAULT_LAYER_MODULE,
				     (TIL_MODULE_EXPERIMENTAL | TIL_MODULE_HERMETIC),
				     exclusions);
}


static int compose_texture_module_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
	return til_module_setup_full(settings,
				     res_setting,
				     res_desc,
				     res_setup,
				     "Texture module name",
				     COMPOSE_DEFAULT_TEXTURE_MODULE,
				     (TIL_MODULE_EXPERIMENTAL | TIL_MODULE_HERMETIC),
				     NULL);
}


static int compose_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
	const til_settings_t	*layers_settings, *texture_settings;
	const char		*layers;
	const char		*texture;
	const char		*texture_values[] = {
					"none",
					"blinds",
					"checkers",
					"drizzle",
					"julia",
					"moire",
					"plasma",
					"roto",
					"stars",
					"submit",
					"swab",
					"voronoi",
					NULL
				};
	int			r;

	r = til_settings_get_and_describe_value(settings,
						&(til_setting_spec_t){
							.name = "Comma-separated list of module layers, in draw-order",
							.key = "layers",
							.preferred = "drizzle,stars,spiro,plato",
							.annotations = NULL,
							/* TODO: .values = could have a selection of interesting preset compositions... */
							.random = compose_random_layers_setting,
							.as_nested_settings = 1,
						},
						&layers, /* XXX: unused in raw-value form, we want the settings instance */
						res_setting,
						res_desc);
	if (r)
		return r;

	assert(res_setting && *res_setting && (*res_setting)->value_as_nested_settings);
	layers_settings = (*res_setting)->value_as_nested_settings;
	{
		til_setting_t	*layer_setting;

		/*
		 * Note this relies on til_settings_get_value_by_idx() returning NULL once idx runs off the end,
		 * which is indistinguishable from a NULL-valued setting, so if the user were to fat-finger
		 * an empty layer like "layers=foo,,bar" maybe we'd never reach bar.  This could be made more robust
		 * by explicitly looking at the number of settings and just ignoring NULL values, but maybe
		 * instead we should just prohibit such settings constructions?  Like an empty value should still get
		 * "" not NULL put in it.  FIXME TODO XXX verify/clarify/assert this in code
		 */
		for (size_t i = 0; til_settings_get_value_by_idx(layers_settings, i, &layer_setting); i++) {
			if (!layer_setting->value_as_nested_settings) {
				r = til_setting_desc_new(	layers_settings,
								&(til_setting_spec_t){
									.as_nested_settings = 1,
								}, res_desc);
				if (r < 0)
					return r;

				*res_setting = layer_setting;

				return 1;
			}
		}

		for (size_t i = 0; til_settings_get_value_by_idx(layers_settings, i, &layer_setting); i++) {
			r = compose_layer_module_setup(layer_setting->value_as_nested_settings,
						       res_setting,
						       res_desc,
						       NULL); /* XXX: note no res_setup, must defer finalize */
			if (r)
				return r;
		}
	}

	r = til_settings_get_and_describe_value(settings,
						&(til_setting_spec_t){
							.name = "Module to use for source texture, \"none\" to disable",
							.key = "texture",
							.preferred = COMPOSE_DEFAULT_TEXTURE_MODULE,
							.annotations = NULL,
							.values = texture_values,
							.as_nested_settings = 1,
							.as_label = 1,
						},
						&texture,
						res_setting,
						res_desc);
	if (r)
		return r;

	assert(res_setting && *res_setting && (*res_setting)->value_as_nested_settings);
	texture_settings = (*res_setting)->value_as_nested_settings;

	r = compose_texture_module_setup(texture_settings,
					 res_setting,
					 res_desc,
					 NULL); /* XXX: note no res_setup, must defer finalize */
	if (r)
		return r;

	if (res_setup) { /* turn layers settings into an array of compose_setup_layer_t's {name,til_setup_t} */
		size_t			n_layers = til_settings_get_count(layers_settings);
		til_setting_t		*layer_setting;
		compose_setup_t		*setup;

		setup = til_setup_new(settings, sizeof(*setup) + n_layers * sizeof(*setup->layers), compose_setup_free, &compose_module);
		if (!setup)
			return -ENOMEM;

		setup->n_layers = n_layers;

		for (size_t i = 0; til_settings_get_value_by_idx(layers_settings, i, &layer_setting); i++) {
			r = compose_layer_module_setup(layer_setting->value_as_nested_settings,
						       res_setting,
						       res_desc,
						       &setup->layers[i].module_setup); /* finalize! */
			if (r < 0) {
				til_setup_free(&setup->til_setup);
				return r;
			}

			assert(r == 0);
		}

		r = compose_texture_module_setup(texture_settings,
						 res_setting,
						 res_desc,
						 &setup->texture.module_setup); /* finalize! */
		if (r < 0) {
			til_setup_free(&setup->til_setup);
			return r;
		}

		assert(r == 0);

		*res_setup = &setup->til_setup;
	}

	return 0;
}
© All Rights Reserved