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-rw-r--r--src/modules/compose/compose.c62
1 files changed, 61 insertions, 1 deletions
diff --git a/src/modules/compose/compose.c b/src/modules/compose/compose.c
index 110bb63..78ec75a 100644
--- a/src/modules/compose/compose.c
+++ b/src/modules/compose/compose.c
@@ -1,4 +1,5 @@
#include <stdlib.h>
+#include <string.h>
#include <time.h>
#include "til.h"
@@ -117,6 +118,64 @@ static void compose_prepare_frame(void *context, unsigned ticks, unsigned n_cpus
}
+/* return a randomized valid layers= setting */
+static char * compose_random_layers_setting(void)
+{
+ size_t n_modules, n_rand_overlays, n_overlayable = 0, base_idx;
+ char *layers = NULL;
+ const til_module_t **modules;
+
+ til_get_modules(&modules, &n_modules);
+
+ for (size_t i = 0; i < n_modules; i++) {
+ if (modules[i]->flags & TIL_MODULE_OVERLAYABLE)
+ n_overlayable++;
+ }
+
+ base_idx = rand() % (n_modules - n_overlayable);
+ for (size_t i = 0, j = 0; !layers && i < n_modules; i++) {
+ 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() % (n_overlayable - 1));
+ for (size_t n = 0; n < n_rand_overlays; n++) {
+ size_t rand_idx = rand() % n_overlayable;
+
+ for (size_t i = 0, j = 0; i < n_modules; i++) {
+ 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 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 char *layers;
@@ -127,7 +186,8 @@ static int compose_setup(const til_settings_t *settings, til_setting_t **res_set
.name = "Colon-separated list of module layers, in draw-order",
.key = "layers",
.preferred = "drizzle:stars:spiro:plato",
- .annotations = NULL
+ .annotations = NULL,
+ .random = compose_random_layers_setting,
},
&layers,
res_setting,
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