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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "animation.h"
#include <SDL2/SDL_image.h>
const SDL_Rect* current_frame(const struct animation* animation) {
return &animation->frames[animation->current_frame];
}
void init_animation(struct animation* animation,
struct animation_init* init) {
int initial_frame_count = init->initial_frame_count;
if (initial_frame_count <= 0) {
fprintf(stderr, "All animations need to have at least 1 frame!\n");
exit(1);
}
animation->texture = IMG_LoadTexture(init->ren, init->spritesheet);
if(animation->texture == NULL) {
printf("Failed to load spritesheet %s, error: %s, exitting!\n",
init->spritesheet, IMG_GetError());
exit(1);
}
animation->num_frames = initial_frame_count;
int size = initial_frame_count * sizeof(float);
animation->frame_times = malloc(size);
memcpy(animation->frame_times, init->initial_frame_times, size);
size = initial_frame_count * sizeof(SDL_Rect);
animation->frames = malloc(size);
memcpy(animation->frames, init->initial_frames, size);
animation->angle = init->initial_angle;
}
void update_animation(struct animation* animation, float dt) {
int frame_index = animation->current_frame;
float current_frame_time = animation->frame_times[frame_index];
animation->current_time += dt;
if(animation->current_time >= current_frame_time) {
animation->current_time = 0;
animation->current_frame =
(frame_index + 1) % animation->num_frames;
}
}
void draw_animation(struct demo* demo,
const struct animation* animation,
const SDL_Rect* d_rect) {
const SDL_Rect* s_rect = current_frame(animation);
demo_rendercopy_ex(demo, animation->texture,
s_rect, d_rect,
animation->angle,
NULL,
SDL_FLIP_NONE);
}
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