RogueLife/src/anim.c

#include "anim.h"
#include <gint/display.h>
#include <gint/defs/util.h>

/* Definition of simple and direction animations. */

#define ANIM1(name) \
    extern anim_frame_t frames_ ## name[]; \
    anim_t anims_ ## name = { 1, { frames_ ## name }};

#define ANIM_2DIRECTIONAL(prefix, suffix) \
    extern anim_frame_t frames_ ## prefix ## _left  ## suffix[]; \
    extern anim_frame_t frames_ ## prefix ## _right ## suffix[]; \
    anim_t anims_ ## prefix ## suffix = { 2, { \
        frames_ ## prefix ## _left  ## suffix, \
        frames_ ## prefix ## _right ## suffix, \
    }}; \

#define ANIM_4DIRECTIONAL(prefix, suffix) \
    extern anim_frame_t frames_ ## prefix ## _up    ## suffix[]; \
    extern anim_frame_t frames_ ## prefix ## _right ## suffix[]; \
    extern anim_frame_t frames_ ## prefix ## _down  ## suffix[]; \
    extern anim_frame_t frames_ ## prefix ## _left  ## suffix[]; \
    anim_t anims_ ## prefix ## suffix = { 4, { \
        frames_ ## prefix ## _up    ## suffix, \
        frames_ ## prefix ## _right ## suffix, \
        frames_ ## prefix ## _down  ## suffix, \
        frames_ ## prefix ## _left  ## suffix, \
    }};

/* Make suffix optional */
#define ANIM2(prefix, ...) \
    ANIM_2DIRECTIONAL(prefix, __VA_OPT__(_ ## __VA_ARGS__))
#define ANIM4(prefix, ...) \
    ANIM_4DIRECTIONAL(prefix, __VA_OPT__(_ ## __VA_ARGS__))

/* Basic skills */
ANIM1(skill_hit);
ANIM2(skill_projectile);
ANIM1(skill_teleport);
ANIM1(skill_shock);
ANIM1(skill_judgement);
ANIM1(skill_launch);
/* Directional skills */
ANIM4(skill_swing);
ANIM4(skill_impale);
ANIM4(skill_bullet);
ANIM4(skill_magic);

/* Enemies */
ANIM_ENEMIES(ANIM2)

/* Player */
ANIM4(player, Idle);
ANIM4(player, Walking);
ANIM4(player, Attack);
ANIM4(player, Hit);
ANIM4(player, KO);
ANIM4(player, IdleKO);

/* HUD */
ANIM1(hud_xp_Idle);
ANIM1(hud_xp_Shine);
ANIM1(hud_xp_Explode);
ANIM1(hud_backpack_Idle);
ANIM1(hud_backpack_Open);
ANIM1(hud_backpack_InventoryOpen);
ANIM1(hud_backpack_InventoryIdle);
ANIM1(hud_backpack_InventoryClose);

/* Items */
ANIM1(item_life);
ANIM1(item_chest);
ANIM1(item_potion_atk);
ANIM1(item_potion_cooldown);
ANIM1(item_potion_def);
ANIM1(item_potion_frz);
ANIM1(item_potion_hp);
ANIM1(item_potion_spd);
ANIM1(item_stick1);
ANIM1(item_stick2);
ANIM1(item_sword1);
ANIM1(item_sword2);
ANIM1(item_armor1);
ANIM1(item_buff);

/* Animation functions. */

fixed_t (anim_duration)(anim_t const *anim)
{
    anim_frame_t const *frame = anim->start[0];
    int ms = 0;
    int i = 0;

    while(frame == anim->start[0] + i) {
        ms += frame->duration;
        frame = frame->next;
        i++;
    }

    return fix(ms) / 1000;
}

bool anim_in(anim_frame_t const *frame, anim_t const *anim, int index)
{
    if(index >= anim->directions || !frame || !anim)
        return false;

    anim_frame_t *f = anim->start[index];

    for(int i = 0; f == anim->start[index] + i; i++) {
        if(f == frame)
            return true;
        f = f->next;
    }

    return false;
}

void anim_frame_render(int x, int y, anim_frame_t const *frame)
{
    if(!frame) return;
    dsubimage(x - frame->cx, y - frame->cy, frame->sheet,
        frame->x, frame->y, frame->w, frame->h, DIMAGE_NONE);
}

void anim_frame_subrender(int x, int y, anim_frame_t const *frame, int left,
    int top, int width, int height)
{
    if(!frame) return;
    if(width < 0) width = frame->w;
    if(height < 0) height = frame->h;

    /* Basic clipping */
    if(left < 0) width += left, left = 0;
    if(top < 0) height += top, top = 0;
    width = min(width, frame->w - left);
    height = min(height, frame->h - top);

    dsubimage(x - frame->cx, y - frame->cy + top, frame->sheet,
        frame->x + left, frame->y + top, width, height, DIMAGE_NONE);
}

bool anim_state_update(anim_state_t *state, fixed_t dt)
{
    if(!state->frame) return false;

    state->elapsed += fround(dt * 1000);
    if(state->elapsed < state->frame->duration) return false;

    // TODO: FIXME: This is incorrect if the next animation is just behind
    bool transitioning = (state->frame->next != state->frame + 1);

    /* Switch to next frame */
    state->elapsed -= state->frame->duration;
    state->frame = state->frame->next;

    return transitioning;
}