*: wire up context-specific setup instances

This is a preparatory commit for cleaning up the existing sloppy
global-ish application of settings during the iterative _setup()
call sequences.

Due to how this has evolved from a very rudimentary thing
enjoying many assumptions about there ever only being a single
module instance being configured by the settings, there's a lot
of weirdness and inconsistency surrounding module setup WRT
changes being applied instantaneously to /all/ existing and
future context's renderings of a given module vs. requiring a new
context be created to realize changes.

This commit doesn't actually change any of that, but puts the
plumbing in place for the setup methods to allocate and
initialize a private struct encapsulating the parsed and
validated setup once the settings are complete.  This opaque
setup pointer will then be provided to the associated
create_context() method as the setup pointer.  Then the created
context can configure itself using the provided setup when
non-NULL, or simply use defaults when NULL.

A future commit will update the setup methods to allocate and
populate their respective setup structs, adding the structs as
needed, as well as updating their create_context() methods to
utilize those setups.

One consequence of these changes when fully realized will be that
every setting change will require a new context be created from
the changed settings for the change to be realized.

For settings appropriately manipulated at runtime the concept of
knobs was introduced but never finished.  That will have to be
finished in the future to enable more immediate/interactive
changing of settings-like values appropriate for interactive
manipulation

1 files changed, 4 insertions, 4 deletions

diff --git a/src/til.h b/src/til.h
index 6c6c745..29bbb2c 100644
--- a/src/til.h
+++ b/src/til.h
@@ -12,12 +12,12 @@ typedef struct til_setting_desc_t til_setting_desc_t;
 typedef struct til_knob_t til_knob_t;
 
 typedef struct til_module_t {
-	void *	(*create_context)(unsigned ticks, unsigned n_cpus);
+	void *	(*create_context)(unsigned ticks, unsigned n_cpus, void *setup);
 	void	(*destroy_context)(void *context);
 	void	(*prepare_frame)(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter);
 	void	(*render_fragment)(void *context, unsigned ticks, unsigned cpu, til_fb_fragment_t *fragment);
 	void	(*finish_frame)(void *context, unsigned ticks, til_fb_fragment_t *fragment);
-	int	(*setup)(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc);
+	int	(*setup)(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, void **res_setup);
 	size_t	(*knobs)(void *context, til_knob_t **res_knobs);
 	char	*name;
 	char	*description;
@@ -30,8 +30,8 @@ void til_shutdown(void);
 const til_module_t * til_lookup_module(const char *name);
 void til_get_modules(const til_module_t ***res_modules, size_t *res_n_modules);
 void til_module_render(const til_module_t *module, void *context, unsigned ticks, til_fb_fragment_t *fragment);
-int til_module_create_context(const til_module_t *module, unsigned ticks, void **res_context);
+int til_module_create_context(const til_module_t *module, unsigned ticks, void *setup, void **res_context);
 void * til_module_destroy_context(const til_module_t *module, void *context);
-int til_module_setup(til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc);
+int til_module_setup(til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, void **res_setup);
 
 #endif