til_stream: add til_stream_render()

This introduces a concept of a stream's module context, which is
used to render the stream via til_stream_render().

The context is set using til_stream_set_module_context(), but at
this time no reference is taken - it just puts the context into
the stream for use by the render calls.  The caller is
responsible for ensuring it persist as long as the stream uses
it.

This is a preparatory commit for implementing pre/post render
module contexts that get hooked into a stream.  The impetus for
this is supporting background music via modules like playit,
without requiring stuff like rkt scenes to always include the bgm
context in the scene's module context heirarchy.

Nothing is functionally different here, the commit only adds the
new interfaces for setting the context and rendering via stream
instead of til_module_render() of the context you'd now set on
the stream.

2 files changed, 26 insertions, 0 deletions

diff --git a/src/til_stream.c b/src/til_stream.c
index 8fd4b07..3f220fb 100644
--- a/src/til_stream.c
+++ b/src/til_stream.c
@@ -100,6 +100,7 @@ typedef struct til_stream_t {
 	unsigned			audio_controlled:1;
 	til_stream_pipe_t		*pipe_buckets[TIL_STREAM_PIPE_BUCKETS_COUNT];
 	til_stream_module_context_t	*module_context_buckets[TIL_STREAM_CTXT_BUCKETS_COUNT];
+	til_module_context_t		*module_context;
 } til_stream_t;
 
 
@@ -791,3 +792,24 @@ void til_stream_fprint_module_contexts(til_stream_t *stream, FILE *out)
 	(void) til_stream_for_each_module_context(stream, til_stream_fprint_module_context_cb, out);
 	fprintf(out, "\n");
 }
+
+
+void til_stream_set_module_context(til_stream_t *stream, til_module_context_t *context)
+{
+	assert(stream);
+	assert(context);
+
+	/* TODO: it feels like this should probably take a reference */
+	stream->module_context = context;
+}
+
+
+void til_stream_render(til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr)
+{
+	assert(stream);
+	assert(fragment_ptr);
+
+	stream->frame++;
+
+	til_module_render(stream->module_context, stream, ticks, fragment_ptr);
+}
diff --git a/src/til_stream.h b/src/til_stream.h
index a0dde31..bae5abb 100644
--- a/src/til_stream.h
+++ b/src/til_stream.h
@@ -25,6 +25,7 @@
 #include "til_setup.h"
 
 typedef struct til_audio_context_t til_audio_context_t;
+typedef struct til_fb_fragment_t til_fb_fragment_t;
 typedef struct til_stream_t til_stream_t;
 typedef struct til_stream_module_context_t til_stream_module_context_t;
 typedef struct til_stream_pipe_t til_stream_pipe_t;
@@ -80,4 +81,7 @@ int til_stream_find_module_contexts(til_stream_t *stream, const char *path, size
 unsigned til_stream_gc_module_contexts(til_stream_t *stream);
 void til_stream_fprint_module_contexts(til_stream_t *stream, FILE *out);
 
+void til_stream_set_module_context(til_stream_t *stream, til_module_context_t *context);
+void til_stream_render(til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr);
+
 #endif