feat: improve mountain realism

include/Cubed/gameplay/biome.hpp

@@ -7,8 +7,15 @@ namespace Cubed {
 
 constexpr float BIOME_NOISE_FREQUENCY = 0.03f;
 constexpr float HEIGHTMAP_NOISE_FREQUENCY = 0.001f;
+constexpr float MOUNTAINOUS_NOISE_FREQUENCY = 0.003f;
 enum class BiomeType { PLAIN = 0, FOREST, DESERT, MOUNTAIN, RIVER, NONE };
 
+struct BiomeConditions {
+    float temp = 0.0f;
+    float humid = 0.0f;
+    float mountainous = 0.0f;
+};
+
 struct BiomeHeightRange {
     int base_y;
     int amplitude;
@@ -47,13 +54,14 @@ struct MountainParams : public BaseBiomeParams {};
 struct RiverParams : public BaseBiomeParams {};
 
 std::string get_biome_str(BiomeType biome);
-BiomeType get_biome_from_noise(float temp, float humid);
 std::array<float, 3> get_noise_frequencies_for_biome(BiomeType biome);
 BiomeHeightRange get_biome_height_range(BiomeType biome);
 BiomeType safe_int_to_biome(int x);
 int get_interpolated_height(float world_x, float world_z, float temp,
                             float humid);
 
+BiomeType determine_biome(const BiomeConditions& conditions);
+
 PlainParams& plain_params();
 ForestParams& forest_params();
 DesertParams& desert_params();

include/Cubed/gameplay/chunk.hpp

@@ -38,6 +38,9 @@ private:
     float frequency = 0.01f;
     float height = 80;
     unsigned m_seed = 0;
+
+    BiomeConditions m_conditions;
+
     void clear_dirty();
 
 public:
@@ -108,6 +111,7 @@ public:
     std::vector<BlockType>& blocks();
     World& world();
     unsigned seed() const;
+    BiomeConditions& conditions();
 };
 
 } // namespace Cubed