1 files changed, 57 insertions, 0 deletions
diff --git a/terrain_cache.cpp b/terrain_cache.cpp
new file mode 100644
index 0000000..c40a1d6
--- /dev/null
+++ b/terrain_cache.cpp
@@ -0,0 +1,57 @@
+#include "terrain_cache.h"
+
+/* TerrainCacheObject */
+
+TerrainCacheObject::TerrainCacheObject(TerrainCache *cache, int x, int y, int width, int height) {
+	this->cache = cache;
+	this->x = x;
+	this->y = y;
+	this->width = width;
+	this->height = height;
+	this->heights = cache->tl->get_chunk(x, y, width, height);
+}
+
+TerrainCacheObject::~TerrainCacheObject() {
+	cache->tl->save_chunk(heights, x, y, width, height);
+	delete[] heights;
+}
+
+/* TerrainCache */
+
+TerrainCache::TerrainCache(int seed, fs::path root, size_t max_size) {
+	this->max_size = max_size;
+	tl = new TerrainLoader(seed, root);
+}
+
+TerrainCache::~TerrainCache() {
+	caches.clear();
+	delete tl;
+}
+
+TerrainCacheObject::p TerrainCache::make_object(int x, int y, int width, int height) {
+	TerrainCacheObject::p ob(new TerrainCacheObject(this, x, y, width, height));
+
+	if(caches.size() >= max_size) {
+		for(cache_map::iterator it = caches.begin(); it != caches.end(); it++) {
+			if(it->second.use_count() == 1) {
+				caches.erase(it);
+				break;
+			}
+		}
+	}
+
+	caches.insert(std::pair<intpair, TerrainCacheObject::p>(intpair(x, y), ob));
+	return ob;
+}
+
+TerrainCacheObject::p TerrainCache::get_chunk(int x, int y, int width, int height) {
+	cache_map::iterator it = caches.find(intpair(x, y));
+	if(it != caches.end())
+		return it->second;
+
+	return make_object(x, y, width, height);
+}
+
+size_t TerrainCache::get_size() {
+	return caches.size();
+}