1 files changed, 167 insertions, 0 deletions
diff --git a/src/til_builtins.c b/src/til_builtins.c
new file mode 100644
index 0000000..7a36d23
--- /dev/null
+++ b/src/til_builtins.c
@@ -0,0 +1,167 @@
+#include "til.h"
+#include "til_fb.h"
+#include "til_module_context.h"
+#include "til_settings.h"
+#include "til_stream.h"
+
+#include "libs/txt/txt.h" /* for rendering some diagnostics (ref built-in)) */
+
+
+/* "blank" built-in module */
+static void _blank_prepare_frame(til_module_context_t *context, til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr, til_frame_plan_t *res_frame_plan)
+{
+	*res_frame_plan = (til_frame_plan_t){ .fragmenter = til_fragmenter_slice_per_cpu };
+}
+
+
+static void _blank_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
+{
+	til_fb_fragment_clear(*fragment_ptr);
+}
+
+
+til_module_t	_blank_module = {
+	.prepare_frame = _blank_prepare_frame,
+	.render_fragment = _blank_render_fragment,
+	.name = "blank",
+	.description = "Blanker (built-in)",
+	.author = "built-in",
+};
+
+
+/* "noop" built-in module */
+til_module_t	_noop_module = {
+	.name = "noop",
+	.description = "Nothing-doer (built-in)",
+	.author = "built-in",
+	.flags = TIL_MODULE_BUILTIN,
+};
+
+
+/* "ref" built-in module */
+typedef struct _ref_setup_t {
+	til_setup_t		til_setup;
+
+	char			*path;
+} _ref_setup_t;
+
+
+typedef struct _ref_context_t {
+	til_module_context_t	til_module_context;
+
+	til_module_context_t	*ref;
+} _ref_context_t;
+
+
+static til_module_context_t * _ref_create_context(const til_module_t *module, til_stream_t *stream, unsigned seed, unsigned ticks, unsigned n_cpus, til_setup_t *setup)
+{
+	_ref_context_t	*ctxt;
+
+	ctxt = til_module_context_new(module, sizeof(*ctxt), stream, seed, ticks, n_cpus, setup);
+	if (!ctxt)
+		return NULL;
+
+	return &ctxt->til_module_context;
+}
+
+
+static void _ref_destroy_context(til_module_context_t *context)
+{
+	_ref_context_t	*ctxt = (_ref_context_t *)context;
+
+	ctxt->ref = til_module_context_free(ctxt->ref);
+	free(context);
+}
+
+
+static void _ref_render_fragment(til_module_context_t *context, til_stream_t *stream, unsigned ticks, unsigned cpu, til_fb_fragment_t **fragment_ptr)
+{
+	_ref_context_t	*ctxt = (_ref_context_t *)context;
+	_ref_setup_t	*s = (_ref_setup_t *)context->setup;
+
+	if (!ctxt->ref) {
+		int	r;
+
+		/* TODO: switch to til_stream_find_module_context(), this clones concept is DOA. */
+		r = til_stream_find_module_contexts(stream, s->path, 1, &ctxt->ref);
+		if (r < 0) {
+			txt_t	*msg = txt_newf("%s: BAD PATH \"%s\"", context->setup->path, s->path);
+
+			til_fb_fragment_clear(*fragment_ptr);
+			txt_render_fragment(msg, *fragment_ptr, 0xffffffff,
+					    0, 0,
+					    (txt_align_t){
+						.horiz = TXT_HALIGN_LEFT,
+						.vert = TXT_VALIGN_TOP,
+					    });
+			txt_free(msg);
+			/* TODO: maybe print all available contexts into the fragment? */
+			return;
+		}
+	}
+
+	til_module_render_limited(ctxt->ref, stream, ticks, context->n_cpus, fragment_ptr);
+}
+
+
+static void _ref_setup_free(til_setup_t *setup)
+{
+	_ref_setup_t	*s = (_ref_setup_t *)setup;
+
+	free(s->path);
+	free(s);
+}
+
+
+static int _ref_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	_ref_module = {
+	.create_context = _ref_create_context,
+	.destroy_context = _ref_destroy_context,
+	.render_fragment = _ref_render_fragment,
+	.setup = _ref_setup,
+	.name = "ref",
+	.description = "Context referencer (built-in)",
+	.author = "built-in",
+	.flags = TIL_MODULE_BUILTIN,
+};
+
+
+static int _ref_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	*path;
+	int		r;
+
+	r = til_settings_get_and_describe_value(settings,
+						&(til_setting_spec_t){
+							.name = "Context path to reference",
+							.key = "path",
+							.regex = "[a-zA-Z0-9/_]+",
+							.preferred = "",
+						},
+						&path,
+						res_setting,
+						res_desc);
+	if (r)
+		return r;
+
+	if (res_setup) {
+		_ref_setup_t    *setup;
+
+		setup = til_setup_new(settings, sizeof(*setup), _ref_setup_free, &_ref_module);
+		if (!setup)
+			return -ENOMEM;
+
+		setup->path = strdup(path);
+		if (!setup->path) {
+			til_setup_free(&setup->til_setup);
+
+			return -ENOMEM;
+	       }
+
+		*res_setup = &setup->til_setup;
+	}
+
+	return 0;
+}