From dc104e37842049e040f7e39f4e1aab56cde1488c Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Wed, 1 Jun 2011 19:02:52 +0200
Subject: Moved common files here.

---
 terrain_cache.cpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 terrain_cache.cpp

(limited to 'terrain_cache.cpp')

diff --git a/terrain_cache.cpp b/terrain_cache.cpp
new file mode 100644
index 0000000..01cc161
--- /dev/null
+++ b/terrain_cache.cpp
@@ -0,0 +1,73 @@
+#include "terrain_cache.h"
+
+/* TerrainCacheObject */
+
+TerrainCacheObject::TerrainCacheObject(TerrainCache *cache, int64_t x, int64_t y, unsigned int width, unsigned int height, float *heights) {
+	this->cache = cache;
+	this->x = x;
+	this->y = y;
+	this->width = width;
+	this->height = height;
+	if(heights)
+		this->heights = heights;
+	else
+		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(fs::path root, size_t max_size) {
+	this->max_size = max_size;
+	tl = TerrainLoader::p(new TerrainLoader(root));
+}
+
+TerrainCache::TerrainCache(TerrainLoader::p loader, size_t max_size) {
+	this->max_size = max_size;
+	tl = loader;
+}
+
+TerrainCache::~TerrainCache() {
+	caches.clear();
+}
+
+TerrainCacheObject::p TerrainCache::make_object(int64_t x, int64_t y, unsigned int width, unsigned int height, float *heights) {
+	TerrainCacheObject::p ob(new TerrainCacheObject(this, x, y, width, height, heights));
+
+	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(int64_t x, int64_t y, unsigned int width, unsigned 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);
+}
+
+void TerrainCache::add_chunk(float *heights, int64_t x, int64_t y, unsigned int width, unsigned int height) {
+	cache_map::iterator it = caches.find(intpair(x, y));
+	if(it != caches.end())
+		caches.erase(it);
+
+	tl->save_chunk(heights, x, y, width, height);
+	make_object(x, y, width, height, heights);
+}
+
+size_t TerrainCache::get_size() {
+	return caches.size();
+}
-- 
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