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#include "terrain_loader.h"
#include <boost/format.hpp>
#include <boost/filesystem/fstream.hpp>
#include <stdexcept>
TerrainLoader::TerrainLoader(fs::path root) {
this->root = root;
}
TerrainLoader::~TerrainLoader() {
}
float *TerrainLoader::get_chunk(int64_t x, int64_t y, unsigned int width, unsigned int height) {
if(has_chunk(x, y))
return load_chunk(x, y, width, height);
return NULL;
}
bool TerrainLoader::has_chunk(int64_t x, int64_t y) {
return fs::exists(root / (boost::format("%d.%d.chunk") % x % y).str());
}
// TODO: Handle big-endian platforms
void TerrainLoader::save_chunk(float *chunk, int64_t x, int64_t y, unsigned int width, unsigned int height) {
fs::path p = root / (boost::format("%d.%d.chunk") % x % y).str();
fs::ofstream os(p, std::ios::out | std::ios::binary);
uint64_t w = width;
uint64_t h = height;
os.write((const char*)&w, sizeof(w));
os.write((const char*)&h, sizeof(h));
os.write((const char*)chunk, width*height * sizeof(float));
os.close();
}
// TODO: Handle big-endian platforms
// NOTE: assumes width <= chunk_size+1, likewise for height
float *TerrainLoader::load_chunk(int64_t x, int64_t y, unsigned int width, unsigned int height) {
fs::path p = root / (boost::format("%d.%d.chunk") % x % y).str();
fs::ifstream is(p, std::ios::in | std::ios::binary);
uint64_t w, h;
w = h = 0;
is.read((char*)&w, sizeof(w));
is.read((char*)&h, sizeof(h));
// TODO: should return w and h, fix calling code
if(w != width || h != height)
throw std::runtime_error("width or height doesn't match");
float *chunk = new float[width*height];
is.read((char*)chunk, width*height*sizeof(float));
is.close();
return chunk;
}
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