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_loader.cpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 terrain_loader.cpp

(limited to 'terrain_loader.cpp')

diff --git a/terrain_loader.cpp b/terrain_loader.cpp
new file mode 100644
index 0000000..ef61e1e
--- /dev/null
+++ b/terrain_loader.cpp
@@ -0,0 +1,58 @@
+#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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