//---
// anim: Renderer's animations
//
// Animations in this engine are simply linked variants of sprites. Animated
// images change over time, moving from frame to frame, and that's it.
//---

#pragma once

#include <stdint.h>
#include "fixed.h"

#include <gint/display.h>

typedef struct anim_frame {
	/* Sheet */
	bopti_image_t const *sheet;
	/* Box for the frame within the sheet */
	uint8_t x, y, w, h;
	/* Position of center for this frame */
	int8_t cx, cy;
	/* Duration of the frame (ms) */
	uint16_t duration;
	/* Next frame */
	struct anim_frame *next;
} anim_frame_t;

typedef struct {
	/* Current frame */
	anim_frame_t const *frame;
	/* Time elapsed */
	uint16_t elapsed;
} anim_state_t;

/* Duration of an animation, in seconds (assuming linear order until end). */
fixed_t anim_duration(anim_frame_t const *first_frame);

#define anim_duration(ff) _Generic((ff), \
	anim_frame_t  *: anim_duration((void *)ff), \
	anim_frame_t **: anim_duration(*(void **)ff))

/* Render a frame at the center position (x,y). */
void anim_frame_render(int x, int y, anim_frame_t const *frame);

/* Update an animation to next frame. */
void anim_state_update(anim_state_t *state, fixed_t dt);

/* List of animations. */

/* Basic animations. */
extern anim_frame_t anim_slime_idle_down[];
extern anim_frame_t anim_slime_death[];
extern anim_frame_t anim_bat_idle_down[];
extern anim_frame_t anim_bat_death[];
extern anim_frame_t anim_hit[];

/* Directional animations. */
extern anim_frame_t *anim_player_idle[4];
extern anim_frame_t *anim_player_attack[4];
extern anim_frame_t *anim_swing[4];