Added base terrain generator

src/inc/generator.hpp

@@ -2,4 +2,31 @@
 
 void generate_world(world* out, unsigned int seed)
 {
+	// Use rand() and RAND_MAX for white noise.
+
+	srand(seed);
+
+	// Use FastNoise for fractal Simplex noise.
+
+	FastNoise noise;
+
+	noise.SetSeed(seed);
+
+	noise.SetNoiseType(FastNoise::SimplexFractal);
+
+	noise.SetFractalOctaves(4);
+
+	// Generate the base terrain.
+
+	float frequency = 4.0f;
+
+	for (float x = 0.0f; x < float(out->x_res); x += 1.0f)
+	for (float y = 0.0f; y < float(out->y_res); y += 1.0f)
+	for (float z = 0.0f; z < float(out->z_res); z += 1.0f)
+	{
+		if (y / float(out->y_res) + noise.GetValueFractal(x * frequency, y * frequency, z * frequency) * 0.32f > 0.5f)
+		{
+			out->set_id(int(x), int(y), int(z), id_stone);
+		}
+	}
 }