#include "Lightmap.h"
#include <assert.h>

#include "../util/data_io.h"

Lightmap::Lightmap(){
	map = new light_t[CHUNK_VOL];
	for (uint i = 0; i < CHUNK_VOL; i++){
		map[i] = 0x0000;
	}
}

Lightmap::~Lightmap(){
	delete[] map;
}

void Lightmap::set(const Lightmap* lightmap) {
	for (unsigned int i = 0; i < CHUNK_VOL; i++){
		map[i] = lightmap->map[i];
	}
}

void Lightmap::set(light_t* map) {
	delete[] this->map;
	this->map = map;
}

static_assert(sizeof(light_t) == 2, "replace dataio calls to new light_t");

ubyte* Lightmap::encode() const {
	ubyte* buffer = new ubyte[LIGHTMAP_DATA_LEN];
	for (uint i = 0; i < CHUNK_VOL; i+=2) {
		buffer[i/2] = ((map[i] >> 12) & 0xF) | ((map[i+1] >> 8) & 0xF0);
	}
	return buffer;
}

light_t* Lightmap::decode(ubyte* buffer) {
	light_t* lights = new light_t[CHUNK_VOL];
	for (uint i = 0; i < CHUNK_VOL; i+=2) {
		ubyte b = buffer[i/2];
		lights[i] = ((b & 0xF) << 12);
		lights[i+1] = ((b & 0xF0) << 8);
	} 
	return lights;
}