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#include "sprite.h"
#ifdef DEBUG
#include <stdio.h>
#endif
int draw_sprite(struct sprite *sprite, Sint16 x, Sint16 y,
SDL_Surface * target, Uint32 now) {
static SDL_Rect dest;
static SDL_Surface *source;
source = get_current_sprite_surface(sprite, now);
dest.x = x;
dest.y = y;
dest.w = source->w;
dest.h = source->h;
return SDL_BlitSurface(source, NULL, target, &dest);
}
SDL_Surface *get_current_sprite_surface(struct sprite * sprite, Uint32 now) {
return sprite->
surface_ptr[((now -
sprite->start_tick) / sprite->speed_divisor) %
sprite->surface_count];
}
void init_sprite(struct sprite *sprite, SDL_Surface ** surfaces,
Uint16 surface_count, Uint16 delay, Uint32 now) {
sprite->start_tick = now;
sprite->surface_ptr = surfaces;
sprite->surface_count = surface_count;
sprite->speed_divisor = delay;
#ifdef DEBUG
printf("init sprite=%p start=$%08X divisor=$%04hx count=$%04hx\n",
sprite, sprite->start_tick, sprite->speed_divisor, surface_count);
#endif
}
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