#ifndef __VHEX_DISPLAY_STACK__
# define __VHEX_DISPLAY_STACK__

#include <vhex/display/shader.h>
#include <vhex/display/types.h>

/* dstack_call - dstack indirect call (same as dshader) */
struct dstack_call {
	int (*routine)(
		struct dshader_surface *surface,
		dshader_call_arg_t *draw_args
	);
	dshader_call_arg_t args[12];
};
typedef struct dstack_call dstack_call_t;

/* dstack_action - dstack drawing action information */
struct dstack_action {
	struct dstack_call call;
	struct {
		dshader_call_t *table;
		int number;
		int idx;
	} shader;
};

/* DSTACK_CALL - display indirect call */
#pragma GCC diagnostic ignored "-Wmissing-braces"

#define DSTACK_CALL(fct, ...) (dstack_call_t){	\
	.routine = (void*)fct,			\
	.args = { __VA_ARGS__ }			\
}


/* dstack_config - dstack configuration structure */
struct dstack_config {
	int default_icall_pool_slot;
	int default_icall_args_nb;
	int default_shader_per_action;
};

#ifndef DSTACK_DEFAULT_ICALL_SLOT
# define DSTACK_DEFAULT_ICALL_SLOT		32
#endif

#ifndef DSTACK_DEFAULT_ICALL_ARGS
# define DSTACK_DEFAULT_ICALL_ARGS		12
#endif

#ifndef DSTACK_DEFAULT_SHADER_PER_ACTION
# define DSTACK_DEFAULT_SHADER_PER_ACTION	4
#endif

/* dstack_drv_interface - driver interface */
struct dstack_drv_interface {
	int (*frame_start)(struct dshader_surface *);
	int (*frame_frag_next)(struct dshader_surface *);
	int (*frame_frag_send)(struct dshader_surface *);
	int (*frame_end)(struct dshader_surface *);
};

//---
// Display stack API
//---

/* dstack_init() : Initialise the draw stack (should not be involved) */
extern int dstack_init(struct dstack_config *config);

/* dstack_add_action() : add a new action in the draw stack */
extern did_t dstack_add_action(dstack_call_t *call, dshader_call_t *shaders);

/* dstack_get_action() : get display stack action using its ID */
extern struct dstack_action *dstack_get_action(did_t did);

/* dstack_render(): render a frame */
extern void dstack_render(void);

/* dstack_invalidate() : Invalidate the draw stack (reset) */
extern int dstack_invalidate(void);

/* dstack_quit() : Uninit the draw stack */
extern int dstack_quit(void);



#endif /* __VHEX_DISPLAY_STACK__ */