1 files changed, 48 insertions, 0 deletions
diff --git a/terrain_generator.cpp b/terrain_generator.cpp
new file mode 100644
index 0000000..a57f5d1
--- /dev/null
+++ b/terrain_generator.cpp
@@ -0,0 +1,48 @@
+#include "terrain_generator.h"
+
+#include <noise/noise.h>
+#include "noiseutils/noiseutils.h"
+
+using namespace noise;
+
+TerrainGenerator::TerrainGenerator(int seed, fs::path root) : TerrainLoader(root) {
+	this->seed = seed;
+}
+
+float *TerrainGenerator::generate_heights(int64_t x, int64_t y, unsigned int width, unsigned int height) {
+	const double scale_factor = 0.004;
+	module::Perlin mod;
+	mod.SetSeed(seed);
+
+	utils::NoiseMap heightmap;
+	utils::NoiseMapBuilderPlane heightmap_builder;
+
+	heightmap_builder.SetSourceModule(mod);
+	heightmap_builder.SetDestNoiseMap(heightmap);
+
+	heightmap_builder.SetDestSize(width, height);
+	// subtract by one due to chunk overlapping
+	heightmap_builder.SetBounds((double)(x-1) * scale_factor, (double)(x-1+width) * scale_factor,
+			(double)(y-1) * scale_factor, (double)(y-1+height) * scale_factor);
+	heightmap_builder.Build();
+
+	float *heights = new float[width*height];
+	for(unsigned int i = 0; i < width; i++) {
+		for(unsigned int j = 0; j < height; j++) {
+			heights[i*height + j] = 50*(1+heightmap.GetValue(i, j));
+		}
+	}
+
+	save_chunk(heights, x, y, width, height);
+
+	return heights;
+}
+
+float *TerrainGenerator::get_chunk(int64_t x, int64_t y, unsigned int width, unsigned int height) {
+	float *h;
+	if(has_chunk(x, y))
+		h = load_chunk(x, y, width, height);
+	else
+		h = generate_heights(x, y, width, height);
+	return h;
+}