actor.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "lib/SMSlib.h"
#include "lib/PSGlib.h"
#include "actor.h"
#include "data.h"

void draw_meta_sprite(int x, int y, int w, int h, unsigned char tile) {
	static char i, j;
	static int sx, sy;
	static unsigned char st;
	
	sy = y;
	st = tile;
	for (i = h; i; i--) {
		if (y >= 0 && y < SCREEN_H) {
			sx = x;
			for (j = w; j; j--) {
				if (sx >= 0 && sx < SCREEN_W) {
					SMS_addSprite(sx, sy, tile);
				}
				sx += 8;
				tile += 2;
			}
		}
		sy += 16;
	}
}

void init_actor(actor *act, int x, int y, int char_w, int char_h, unsigned char base_tile, unsigned char frame_count) {
	static actor *sa;
	sa = act;
	
	sa->active = 1;
	
	sa->x = x;
	sa->y = y;
	sa->facing_left = 1;
	
	sa->char_w = char_w;
	sa->char_h = char_h;
	sa->pixel_w = char_w << 3;
	sa->pixel_h = char_h << 4;
	
	sa->animation_delay = 0;
	sa->animation_delay_max = 2;
	
	sa->base_tile = base_tile;
	sa->frame_count = frame_count;
	sa->frame = 0;
	sa->frame_increment = char_w * (char_h << 1);
	sa->frame_max = sa->frame_increment * frame_count;

	sa->path_flags = 0;
	sa->path = 0;
	sa->curr_step = 0;
	
	sa->col_w = sa->pixel_w - 4;
	sa->col_h = sa->pixel_h - 4;
	sa->col_x = (sa->pixel_w - sa->col_w) >> 1;
	sa->col_y = (sa->pixel_h - sa->col_h) >> 1;
	
	sa->state = 0;
	sa->state_timer = 256;
}

void move_actor(actor *_act) {
	static actor *act;
	static path_step *step, *curr_step;
	static char path_flags;
	
	if (!_act->active) {
		return;
	}
	
	act = _act;
	
	if (act->path) {
		curr_step = act->curr_step;
		
		if (!curr_step) curr_step = act->path;
		step = curr_step++;
		if (step->x == -128) step = curr_step = act->path;
		
		path_flags = act->path_flags;
		act->x += (path_flags & PATH_FLIP_X) ? -step->x : step->x;
		act->y += (path_flags & PATH_FLIP_Y) ? -step->y : step->y;
		
		if (path_flags & PATH_2X_SPEED) {
			step = curr_step++;
			if (step->x == -128) step = curr_step = act->path;
			
			path_flags = act->path_flags;
			act->x += (path_flags & PATH_FLIP_X) ? -step->x : step->x;
			act->y += (path_flags & PATH_FLIP_Y) ? -step->y : step->y;
		}

		act->curr_step = curr_step;
	}

	if (_act->spd_x) {
		_act->x += _act->spd_x;
		
		if (_act->spd_x < 0) {
			if (_act->x + _act->pixel_w < 0) _act->active = 0;
		} else {
			if (_act->x >= SCREEN_W) _act->active = 0;
		}				
	}
	
	if (act->state_timer) act->state_timer--;
}

void draw_actor(actor *act) {
	static actor *_act;
	static unsigned char frame_tile;
	static unsigned char frame;
	
	if (!act->active) {
		return;
	}
	
	_act = act;
	
	frame_tile = _act->base_tile + _act->frame;
	if (!_act->facing_left) {
		frame_tile += _act->frame_max;
	}
	
	draw_meta_sprite(_act->x, _act->y, _act->char_w, _act->char_h, frame_tile);	

	if (_act->animation_delay) {
		_act->animation_delay--;
	} else {
		frame = _act->frame;		
		frame += _act->frame_increment;
		if (frame >= _act->frame_max) frame = 0;		
		_act->frame = frame;

		_act->animation_delay = _act->animation_delay_max;
	}
}

void wait_frames(int wait_time) {
	for (; wait_time; wait_time--) SMS_waitForVBlank();
}

void clear_sprites() {
	SMS_initSprites();	
	SMS_finalizeSprites();
	SMS_copySpritestoSAT();
}