RogueLife/src/anim.h

//---
// 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 anims_skill_hit[];
extern anim_frame_t anims_skill_teleport[];
extern anim_frame_t anims_skill_shock[];
extern anim_frame_t anims_skill_judgement[];

/* Enemy animations (bidirectional). */

extern anim_frame_t anims_slime_left_Idle[];
extern anim_frame_t anims_slime_right_Idle[];
extern anim_frame_t anims_slime_left_Walking[];
extern anim_frame_t anims_slime_right_Walking[];
extern anim_frame_t anims_slime_left_Hit[];
extern anim_frame_t anims_slime_right_Hit[];
extern anim_frame_t anims_slime_left_Death[];
extern anim_frame_t anims_slime_right_Death[];

extern anim_frame_t anims_bat_left_Idle[];
extern anim_frame_t anims_bat_right_Idle[];
extern anim_frame_t anims_bat_left_Hit[];
extern anim_frame_t anims_bat_right_Hit[];
extern anim_frame_t anims_bat_left_Death[];
extern anim_frame_t anims_bat_right_Death[];

/* Quadri-directional animations. */
extern anim_frame_t *anims_player_Idle[4];
extern anim_frame_t *anims_player_Walking[4];
extern anim_frame_t *anims_player_Attack[4];
extern anim_frame_t *anims_player_Hit[4];
extern anim_frame_t *anims_skill_swing[4];
extern anim_frame_t *anims_skill_impale[4];
extern anim_frame_t *anims_skill_bullet[4];