3 files changed, 118 insertions, 1 deletions
diff --git a/src/modules/Makefile.am b/src/modules/Makefile.am
index 83c4ac6..fa4e852 100644
--- a/src/modules/Makefile.am
+++ b/src/modules/Makefile.am
@@ -1 +1 @@
-SUBDIRS = flui2d julia pixbounce plasma ray roto sparkler stars submit
+SUBDIRS = flui2d julia pixbounce plasma ray roto rtv sparkler stars submit
diff --git a/src/modules/rtv/Makefile.am b/src/modules/rtv/Makefile.am
new file mode 100644
index 0000000..c301257
--- /dev/null
+++ b/src/modules/rtv/Makefile.am
@@ -0,0 +1,3 @@
+noinst_LIBRARIES = librtv.a
+librtv_a_SOURCES = rtv.c
+librtv_a_CPPFLAGS = -I@top_srcdir@/src
diff --git a/src/modules/rtv/rtv.c b/src/modules/rtv/rtv.c
new file mode 100644
index 0000000..da6ae52
--- /dev/null
+++ b/src/modules/rtv/rtv.c
@@ -0,0 +1,114 @@
+#include <stdlib.h>
+#include <time.h>
+
+#include "fb.h"
+#include "rototiller.h"
+#include "util.h"
+
+/* Copyright (C) 2019 - Vito Caputo <vcaputo@pengaru.com> */
+
+/* This implements an MTV-inspired random slideshow of rototiller modules.
+ *
+ * Eventually it'd be nice to have it show a caption every time a new
+ * module starts overlaying the name, author, license, etc.
+ *
+ * Some TODO items:
+ * - show captions (need text rendering)
+ * - optionally persist module contexts so they resume rather than restart
+ * - runtime-configurable duration
+ * - randomize runtime settings of shown modules
+ * - redo the next module selection from random to
+ *   walking the list and randomizing the list every
+ *   time it completes a cycle.   The current dumb
+ *   random technique will happily keep showing you the
+ *   same thing over and over.
+ */
+
+#define RTV_DURATION_SECS	15
+
+typedef struct rtv_context_t {
+	const rototiller_module_t	**modules;
+	size_t				n_modules;
+
+	time_t				last_switch;
+	const rototiller_module_t	*module;
+	void				*module_ctxt;
+} rtv_context_t;
+
+static void setup_next_module(rtv_context_t *ctxt);
+static void * rtv_create_context(void);
+static void rtv_destroy_context(void *context);
+static void rtv_prepare_frame(void *context, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter);
+static void rtv_finish_frame(void *context, fb_fragment_t *fragment);
+
+
+rototiller_module_t	rtv_module = {
+	.create_context = rtv_create_context,
+	.destroy_context = rtv_destroy_context,
+	.prepare_frame = rtv_prepare_frame,
+	.finish_frame = rtv_finish_frame,
+	.name = "rtv",
+	.description = "Rototiller TV",
+	.author = "Vito Caputo <vcaputo@pengaru.com>",
+	.license = "GPLv2",
+};
+
+
+static void setup_next_module(rtv_context_t *ctxt)
+{
+	int	i;
+
+	/* TODO: most of this module stuff should probably be
+	 * in rototiller.c helpers, but it's harmless for now.
+	 */
+	if (ctxt->module) {
+		if (ctxt->module->destroy_context)
+			ctxt->module->destroy_context(ctxt->module_ctxt);
+
+		ctxt->module_ctxt = NULL;
+	}
+
+	do {
+		i = rand() % ctxt->n_modules;
+	} while (ctxt->modules[i] == &rtv_module || ctxt->modules[i] == ctxt->module);
+
+	ctxt->module = ctxt->modules[i];
+	if (ctxt->module->create_context)
+		ctxt->module_ctxt = ctxt->module->create_context();
+
+	ctxt->last_switch = time(NULL);
+}
+
+
+static void * rtv_create_context(void)
+{
+	rtv_context_t	*ctxt = calloc(1, sizeof(rtv_context_t));
+
+	rototiller_get_modules(&ctxt->modules, &ctxt->n_modules);
+	setup_next_module(ctxt);
+
+	return ctxt;
+}
+
+
+static void rtv_destroy_context(void *context)
+{
+	free(context);
+}
+
+
+static void rtv_prepare_frame(void *context, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
+{
+	rtv_context_t	*ctxt = context;
+
+	if (!ctxt->last_switch || time(NULL) - ctxt->last_switch > RTV_DURATION_SECS)
+		setup_next_module(ctxt);
+
+	rototiller_module_render(ctxt->module, ctxt->module_ctxt, fragment);
+}
+
+
+static void rtv_finish_frame(void *context, fb_fragment_t *fragment)
+{
+	/* TODO: this is stubbed here for drawing the caption overlay */
+}