refactor: use fBM for heightmap generation

include/Cubed/gameplay/biome.hpp

@@ -6,7 +6,7 @@
 namespace Cubed {
 
 constexpr float BIOME_NOISE_FREQUENCY = 0.03f;
-
+constexpr float HEIGHTMAP_NOISE_FREQUENCY = 0.001f;
 enum class BiomeType { PLAIN = 0, FOREST, DESERT, MOUNTAIN, RIVER, NONE };
 
 struct BiomeHeightRange {

include/Cubed/gameplay/chunk.hpp

@@ -48,12 +48,21 @@ public:
     Chunk(Chunk&&) noexcept;
     Chunk& operator=(Chunk&&) noexcept;
 
+    static std::tuple<int, int, int> world_to_block(int world_x, int world_y,
+                                                    int world_z, int chunk_x,
+                                                    int chunk_z);
+    static std::tuple<int, int, int> world_to_block(const glm::ivec3& block_pos,
+                                                    ChunkPos chunk_pos);
+    static std::tuple<int, int, int> block_to_world(int x, int y, int z,
+                                                    int chunk_x, int chunk_z);
+    static std::tuple<int, int, int> block_to_world(const glm::ivec3& block_pos,
+                                                    ChunkPos chunk_pos);
     BiomeType get_biome() const;
     ChunkPos get_chunk_pos() const;
     const std::vector<BlockType>& get_chunk_blocks() const;
     HeightMapArray get_heightmap() const;
-    static int get_index(int x, int y, int z);
+    static int index(int x, int y, int z);
-    static int get_index(const glm::vec3& pos);
+    static int index(const glm::vec3& pos);
     // Init Chunk
     // Determine biome from temperature and humidity noise
     void gen_phase_one();

include/Cubed/tools/perlin_noise.hpp

@@ -4,7 +4,7 @@
 
 namespace Cubed {
 
-class PerlinNoise {
+class PerlinNoise3D {
 public:
     static void init(unsigned seed);
     static float noise(float x, float y, float z);
@@ -18,4 +18,19 @@ private:
     static float grad(int hash, float x, float y, float z);
 };
 
+class PerlinNoise2D {
+public:
+    static void init(unsigned seed);
+    static float noise(float x, float y);
+    static void reload(unsigned seed);
+
+private:
+    static inline std::atomic<bool> is_init = false;
+    static inline std::vector<int> p;
+
+    static float fade(float t);
+    static float lerp(float t, float a, float b);
+    static float grad(int hash, float x, float y);
+};
+
 } // namespace Cubed

src/gameplay/builders/biome_builder.cpp

@@ -10,7 +10,7 @@ void BiomeBuilder::build_bottom() {
     for (int x = 0; x < CHUNK_SIZE; x++) {
         for (int y = 0; y < 5; y++) {
             for (int z = 0; z < CHUNK_SIZE; z++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
         }
     }
@@ -30,7 +30,7 @@ void BiomeBuilder::fill_water() {
                     }
                     int height = heightmap[x][z];
                     for (int y = height; y < SEA_LEVEL; y++) {
-                        m_blocks[Chunk::get_index(x, y, z)] = 7;
+                        m_blocks[Chunk::index(x, y, z)] = 7;
                     }
                 }
             }

src/gameplay/builders/desert_builder.cpp

@@ -19,11 +19,11 @@ void DesertBuilder::build_blocks() {
         for (int z = 0; z < CHUNK_SIZE; z++) {
             int height = static_cast<int>(m_heightmap[x][z]);
             for (int y = 5; y < height - 5; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
 
             for (int y = height - 5; y <= height; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 4;
+                m_blocks[Chunk::index(x, y, z)] = 4;
             }
         }
     }

src/gameplay/builders/forest_builder.cpp

@@ -23,12 +23,12 @@ void ForestBuilder::build_blocks() {
         for (int z = 0; z < CHUNK_SIZE; z++) {
             int height = static_cast<int>(m_heightmap[x][z]);
             for (int y = 5; y < height - 5; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
             for (int y = height - 5; y < height; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 2;
+                m_blocks[Chunk::index(x, y, z)] = 2;
             }
-            m_blocks[Chunk::get_index(x, height, z)] = 1;
+            m_blocks[Chunk::index(x, height, z)] = 1;
         }
     }
 }

src/gameplay/builders/mountain_builder.cpp

@@ -19,19 +19,19 @@ void MountainBuilder::build_blocks() {
         for (int z = 0; z < CHUNK_SIZE; z++) {
             int height = static_cast<int>(m_heightmap[x][z]);
             for (int y = 5; y < height - 5; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
             for (int y = height - 5; y <= height - 1; y++) {
                 if (y > 110) {
-                    m_blocks[Chunk::get_index(x, y, z)] = 3;
+                    m_blocks[Chunk::index(x, y, z)] = 3;
                 } else {
-                    m_blocks[Chunk::get_index(x, y, z)] = 2;
+                    m_blocks[Chunk::index(x, y, z)] = 2;
                 }
             }
             if (height > 110) {
-                m_blocks[Chunk::get_index(x, height, z)] = 3;
+                m_blocks[Chunk::index(x, height, z)] = 3;
             } else {
-                m_blocks[Chunk::get_index(x, height, z)] = 1;
+                m_blocks[Chunk::index(x, height, z)] = 1;
             }
         }
     }

src/gameplay/builders/plain_builder.cpp

@@ -19,12 +19,12 @@ void PlainBuilder::build_blocks() {
         for (int z = 0; z < CHUNK_SIZE; z++) {
             int height = static_cast<int>(m_heightmap[x][z]);
             for (int y = 5; y < height - 5; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
             for (int y = height - 5; y < height; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 2;
+                m_blocks[Chunk::index(x, y, z)] = 2;
             }
-            m_blocks[Chunk::get_index(x, height, z)] = 1;
+            m_blocks[Chunk::index(x, height, z)] = 1;
         }
     }
 }

src/gameplay/builders/river_builder.cpp

@@ -19,16 +19,16 @@ void RiverBuilder::build_blocks() {
         for (int z = 0; z < CHUNK_SIZE; z++) {
             int height = static_cast<int>(m_heightmap[x][z]);
             for (int y = 5; y < height - 5; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 3;
+                m_blocks[Chunk::index(x, y, z)] = 3;
             }
             for (int y = height - 5; y <= height - 1; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 2;
+                m_blocks[Chunk::index(x, y, z)] = 2;
             }
             for (int y = height; y <= height; y++) {
                 if (y >= SEA_LEVEL - 1) {
-                    m_blocks[Chunk::get_index(x, y, z)] = 1;
+                    m_blocks[Chunk::index(x, y, z)] = 1;
                 } else {
-                    m_blocks[Chunk::get_index(x, y, z)] = 2;
+                    m_blocks[Chunk::index(x, y, z)] = 2;
                 }
             }
         }
@@ -46,7 +46,7 @@ void RiverBuilder::build_vegetation() {
                 continue;
             }
             for (int y = height + 1; y < SEA_LEVEL; y++) {
-                m_blocks[Chunk::get_index(x, y, z)] = 7;
+                m_blocks[Chunk::index(x, y, z)] = 7;
             }
         }
     }

src/gameplay/chunk.cpp

@@ -47,6 +47,35 @@ Chunk& Chunk::operator=(Chunk&& other) noexcept {
     return *this;
 }
 
+std::tuple<int, int, int> Chunk::world_to_block(int world_x, int world_y,
+                                                int world_z, int chunk_x,
+                                                int chunk_z) {
+    int x, y, z;
+    y = world_y;
+    x = world_x - chunk_x * CHUNK_SIZE;
+    z = world_z - chunk_z * CHUNK_SIZE;
+    return {x, y, z};
+}
+
+std::tuple<int, int, int> Chunk::world_to_block(const glm::ivec3& block_pos,
+                                                ChunkPos chunk_pos) {
+    return world_to_block(block_pos.x, block_pos.y, block_pos.z, chunk_pos.x,
+                          chunk_pos.z);
+}
+
+std::tuple<int, int, int> Chunk::block_to_world(int x, int y, int z,
+                                                int chunk_x, int chunk_z) {
+    int world_x = x + chunk_x * CHUNK_SIZE;
+    int world_z = z + chunk_z * CHUNK_SIZE;
+    int world_y = y;
+    return {world_x, world_y, world_z};
+}
+std::tuple<int, int, int> Chunk::block_to_world(const glm::ivec3& block_pos,
+                                                ChunkPos chunk_pos) {
+    return block_to_world(block_pos.x, block_pos.y, block_pos.z, chunk_pos.x,
+                          chunk_pos.z);
+}
+
 BiomeType Chunk::get_biome() const { return m_biome.load(); }
 
 ChunkPos Chunk::get_chunk_pos() const { return m_chunk_pos; }
@@ -61,7 +90,7 @@ HeightMapArray Chunk::get_heightmap() const {
     return m_heightmap;
 }
 
-int Chunk::get_index(int x, int y, int z) {
+int Chunk::index(int x, int y, int z) {
     ASSERT(!(x < 0 || y < 0 || z < 0 || x >= CHUNK_SIZE || y >= WORLD_SIZE_Y ||
              z >= CHUNK_SIZE));
     if ((x * WORLD_SIZE_Y + y) * CHUNK_SIZE + z < 0 ||
@@ -73,8 +102,8 @@ int Chunk::get_index(int x, int y, int z) {
     return (x * WORLD_SIZE_Y + y) * CHUNK_SIZE + z;
 }
 
-int Chunk::get_index(const glm::vec3& pos) {
+int Chunk::index(const glm::vec3& pos) {
-    return Chunk::get_index(pos.x, pos.y, pos.z);
+    return Chunk::index(pos.x, pos.y, pos.z);
 }
 
 void Chunk::gen_vertex_data(
@@ -95,7 +124,7 @@ void Chunk::gen_vertex_data(
                 int world_x = x + m_chunk_pos.x * CHUNK_SIZE;
                 int world_z = z + m_chunk_pos.z * CHUNK_SIZE;
                 int world_y = y;
-                int cur_id = m_blocks[get_index(x, y, z)];
+                int cur_id = m_blocks[index(x, y, z)];
                 // air
                 if (cur_id == 0) {
                     continue;
@@ -132,7 +161,7 @@ void Chunk::gen_vertex_data(
                                     return false;
                                 }
 
-                                int idx = Chunk::get_index(x, y, z);
+                                int idx = Chunk::index(x, y, z);
                                 // not init
                                 if (static_cast<size_t>(idx) >=
                                     chunk_blocks->size()) {
@@ -164,7 +193,7 @@ void Chunk::gen_vertex_data(
                         // neighbor_cull = m_world.is_block(glm::ivec3(world_x,
                         // world_y, world_z) + DIR[face]);
                     } else {
-                        auto id = m_blocks[get_index(nx, ny, nz)];
+                        auto id = m_blocks[index(nx, ny, nz)];
                         if (!is_in_transparent_map(id)) {
                             neighbor_cull = true;
                         } else {
@@ -242,7 +271,8 @@ void Chunk::gen_phase_four(
         Logger::error("ChunkGenerator is Nullptr");
         return;
     }
-    m_generator->blend_heightmap_boundaries(neighbor_heightmap, neighbor_biome);
+    // m_generator->blend_heightmap_boundaries(neighbor_heightmap,
+    // neighbor_biome);
 }
 
 void Chunk::gen_phase_five() {

src/gameplay/chunk_generator.cpp

@@ -27,7 +27,8 @@ void ChunkGenerator::init() {
     std::random_device d;
     m_generator_seed = d();
     Logger::info("Chunk Generator Seed {}", m_generator_seed);
-    PerlinNoise::init(m_generator_seed);
+    PerlinNoise3D::init(m_generator_seed);
+    PerlinNoise2D::init(m_generator_seed);
     is_init = true;
 }
 
@@ -35,7 +36,7 @@ void ChunkGenerator::reload() {
     if (!is_seed_change) {
         return;
     }
-    PerlinNoise::reload(m_generator_seed);
+    PerlinNoise3D::reload(m_generator_seed);
     is_seed_change = false;
 }
 
@@ -54,10 +55,10 @@ void ChunkGenerator::assign_chunk_biome() {
     auto m_chunk_pos = m_chunk.chunk_pos();
     float x = static_cast<float>(m_chunk_pos.x);
     float z = static_cast<float>(m_chunk_pos.z);
-    float temp = PerlinNoise::noise(x * BIOME_NOISE_FREQUENCY, 0.0f,
+    float temp = PerlinNoise3D::noise(x * BIOME_NOISE_FREQUENCY, 0.0f,
-                                    z * BIOME_NOISE_FREQUENCY);
+                                      z * BIOME_NOISE_FREQUENCY);
-    float humid = PerlinNoise::noise(x * BIOME_NOISE_FREQUENCY, 1.0f,
+    float humid = PerlinNoise3D::noise(x * BIOME_NOISE_FREQUENCY, 1.0f,
-                                     z * BIOME_NOISE_FREQUENCY);
+                                       z * BIOME_NOISE_FREQUENCY);
     auto biome = get_biome_from_noise(temp, humid);
     m_chunk.biome(biome);
 }
@@ -86,6 +87,7 @@ void ChunkGenerator::resolve_biome_adjacency_conflict(
     }
 }
 
+/*
 void ChunkGenerator::generate_heightmap() {
 
     auto m_chunk_pos = m_chunk.chunk_pos();
@@ -114,6 +116,37 @@ void ChunkGenerator::generate_heightmap() {
         }
     }
 }
+*/
+
+void ChunkGenerator::generate_heightmap() {
+    auto chunk_pos = m_chunk.chunk_pos();
+    auto& heightmap = m_chunk.heightmap();
+
+    for (int x = 0; x < CHUNK_SIZE; ++x) {
+        for (int z = 0; z < CHUNK_SIZE; ++z) {
+            float world_x = static_cast<float>(x + chunk_pos.x * CHUNK_SIZE);
+            float world_z = static_cast<float>(z + chunk_pos.z * CHUNK_SIZE);
+
+            auto fbm_height = [](float x, float y, int octaves,
+                                 float lacunarity, float gain, float amplitude,
+                                 float frequency) -> float {
+                float value = 0.0f;
+                for (int i = 0; i < octaves; i++) {
+                    value += amplitude *
+                             PerlinNoise2D::noise(x * frequency, y * frequency);
+                    frequency *= lacunarity;
+                    amplitude *= gain;
+                }
+                return value;
+            };
+            int octaves = 4;
+            float lacunarity = 2.0f;
+            float gain = 0.5f;
+            heightmap[x][z] = 64 + fbm_height(world_x, world_z, octaves,
+                                              lacunarity, gain, 40, 0.005f);
+        }
+    }
+}
 
 void ChunkGenerator::blend_heightmap_boundaries(
     const std::array<std::optional<HeightMapArray>, 8>& neighbor_heightmap,
@@ -379,8 +412,8 @@ void ChunkGenerator::blend_surface_blocks_borders(
                                            int nx, int nz) -> BlockType {
         // Search from topmost y downwards for the first non-zero block
         for (int y = WORLD_HEIGHT - 1; y >= 0; --y) {
-            int idx = Chunk::get_index(
+            int idx = Chunk::index(nx, y,
-                nx, y, nz); // linear index: y * area + z * size + x
+                                   nz); // linear index: y * area + z * size + x
             if (idx >= 0 && idx < static_cast<int>(blocks.size()) &&
                 blocks[idx] != 0) {
                 return blocks[idx];
@@ -396,7 +429,7 @@ void ChunkGenerator::blend_surface_blocks_borders(
             BlockType type_self = 0;
             int top_y = -1;
             top_y = m_heightmap[x][z];
-            type_self = m_blocks[Chunk::get_index(x, top_y, z)];
+            type_self = m_blocks[Chunk::index(x, top_y, z)];
 
             if (top_y == -1)
                 continue; // no block? skip
@@ -470,7 +503,7 @@ void ChunkGenerator::blend_surface_blocks_borders(
                     final_type = 2;
                 }
 
-                m_blocks[Chunk::get_index(x, top_y, z)] = final_type;
+                m_blocks[Chunk::index(x, top_y, z)] = final_type;
                 // bottom block
                 unsigned fill_type = 2;
                 if (final_type == 1) {
@@ -479,7 +512,7 @@ void ChunkGenerator::blend_surface_blocks_borders(
                     fill_type = 4;
                 }
                 for (int y = top_y - 5; y < top_y; y++) {
-                    m_blocks[Chunk::get_index(x, y, z)] = fill_type;
+                    m_blocks[Chunk::index(x, y, z)] = fill_type;
                 }
             }
         }
@@ -564,7 +597,7 @@ void ChunkGenerator::generate_cave() {
                             if (y == 0) {
                                 continue;
                             }
-                            blocks[Chunk::get_index(x, y, z)] = 0;
+                            blocks[Chunk::index(x, y, z)] = 0;
                         }
                     }
                 }

src/gameplay/tree.cpp

@@ -30,7 +30,7 @@ static constexpr std::array<TreeStructNode, 62> TREE{{
 bool build_tree(Chunk& chunk, const glm::ivec3& pos) {
     auto& block = chunk.get_chunk_blocks();
 
-    if (block[Chunk::get_index(pos)] != 1) {
+    if (block[Chunk::index(pos)] != 1) {
         Logger::info("Root is not Grass Block");
         return false;
     }
@@ -43,13 +43,13 @@ bool build_tree(Chunk& chunk, const glm::ivec3& pos) {
             z >= CHUNK_SIZE) {
             return false;
         }
-        if (block[Chunk::get_index(tree_node)] != 0) {
+        if (block[Chunk::index(tree_node)] != 0) {
             return false;
         }
     }
     for (const auto& d : TREE) {
         auto tree_node = pos + d.offset;
-        chunk.set_chunk_block(Chunk::get_index(tree_node), d.id);
+        chunk.set_chunk_block(Chunk::index(tree_node), d.id);
     }
     return true;
 }

src/gameplay/world.cpp

@@ -86,6 +86,7 @@ void World::init_chunks() {
         std::this_thread::sleep_for(std::chrono::microseconds(200));
     }
 }
+
 /*
 void World::init_chunks() {
 
@@ -332,6 +333,8 @@ ChunkPos World::chunk_pos(int world_x, int world_z) {
     return {chunk_x, chunk_z};
 }
 
+#pragma region ChunkGenerate
+
 void World::gen_chunks_internal() {
     m_chunk_gen_fraction = 0.0f;
     m_chunk_gen_finished = false;
@@ -597,6 +600,8 @@ void World::build_neighbor_context_for_affected_neighbors(
     }
 }
 
+#pragma endregion
+
 void World::start_gen_thread() {
     m_gen_running = true;
     Logger::info("Gen Thread Started");
@@ -667,15 +672,12 @@ int World::get_block(const glm::ivec3& block_pos) const {
     }
 
     const auto& chunk_blocks = it->second.get_chunk_blocks();
-    int x, y, z;
+    auto [x, y, z] = Chunk::world_to_block(block_pos, {chunk_x, chunk_z});
-    y = block_pos.y;
-    x = block_pos.x - chunk_x * CHUNK_SIZE;
-    z = block_pos.z - chunk_z * CHUNK_SIZE;
     if (x < 0 || y < 0 || z < 0 || x >= CHUNK_SIZE || y >= WORLD_SIZE_Y ||
         z >= CHUNK_SIZE) {
         return 0;
     }
-    return chunk_blocks[Chunk::get_index(x, y, z)];
+    return chunk_blocks[Chunk::index(x, y, z)];
 }
 
 bool World::is_block(const glm::ivec3& block_pos) const {
@@ -687,15 +689,12 @@ bool World::is_block(const glm::ivec3& block_pos) const {
         return false;
     }
     const auto& chunk_blocks = it->second.get_chunk_blocks();
-    int x, y, z;
+    auto [x, y, z] = Chunk::world_to_block(block_pos, {chunk_x, chunk_z});
-    y = block_pos.y;
-    x = block_pos.x - chunk_x * CHUNK_SIZE;
-    z = block_pos.z - chunk_z * CHUNK_SIZE;
     if (x < 0 || y < 0 || z < 0 || x >= CHUNK_SIZE || y >= WORLD_SIZE_Y ||
         z >= CHUNK_SIZE) {
         return false;
     }
-    auto id = chunk_blocks[Chunk::get_index(x, y, z)];
+    auto id = chunk_blocks[Chunk::index(x, y, z)];
     if (id == 0) {
         return false;
     } else {
@@ -718,16 +717,14 @@ void World::set_block(const glm::ivec3& block_pos, unsigned id) {
         return;
     }
 
-    int x, y, z;
+    auto [x, y, z] =
-    y = world_y;
+        Chunk::world_to_block(world_x, world_y, world_z, chunk_x, chunk_z);
-    x = world_x - chunk_x * CHUNK_SIZE;
-    z = world_z - chunk_z * CHUNK_SIZE;
     if (x < 0 || y < 0 || z < 0 || x >= CHUNK_SIZE || y >= WORLD_SIZE_Y ||
         z >= CHUNK_SIZE) {
         return;
     }
 
-    it->second.set_chunk_block(Chunk::get_index(x, y, z), id);
+    it->second.set_chunk_block(Chunk::index(x, y, z), id);
 
     static const glm::ivec3 NEIGHBOR_DIRS[] = {
         {1, 0, 0}, {-1, 0, 0}, {0, 0, -1}, {0, 0, 1}};

src/tools/perlin_noise.cpp

@@ -1,8 +1,6 @@
 #include "Cubed/tools/perlin_noise.hpp"
 
-#include "Cubed/config.hpp"
 #include "Cubed/tools/cubed_assert.hpp"
-#include "Cubed/tools/cubed_random.hpp"
 
 #include <algorithm>
 #include <numeric>
@@ -10,7 +8,7 @@
 
 namespace Cubed {
 
-void PerlinNoise::init(unsigned seed) {
+void PerlinNoise3D::init(unsigned seed) {
     p.resize(256);
     std::iota(p.begin(), p.end(), 0);
     Logger::info("Init Perlin Noise With Seed {}", seed);
@@ -20,7 +18,7 @@ void PerlinNoise::init(unsigned seed) {
     is_init = true;
 }
 
-float PerlinNoise::noise(float x, float y, float z) {
+float PerlinNoise3D::noise(float x, float y, float z) {
     ASSERT_MSG(is_init, "The PerlinNoise don't init!");
     int ix = static_cast<int>(std::floor(x)) & 255;
     int iy = static_cast<int>(std::floor(y)) & 255;
@@ -55,11 +53,13 @@ float PerlinNoise::noise(float x, float y, float z) {
     return (res + 1.0f) / 2.0f;
 }
 
-float PerlinNoise::fade(float t) { return t * t * t * (t * (t * 6 - 15) + 10); }
+float PerlinNoise3D::fade(float t) {
+    return t * t * t * (t * (t * 6 - 15) + 10);
+}
 
-float PerlinNoise::lerp(float t, float a, float b) { return a + t * (b - a); }
+float PerlinNoise3D::lerp(float t, float a, float b) { return a + t * (b - a); }
 
-float PerlinNoise::grad(int hash, float x, float y, float z) {
+float PerlinNoise3D::grad(int hash, float x, float y, float z) {
     int h = hash & 15;
 
     float u = h < 8 ? x : y;
@@ -68,7 +68,7 @@ float PerlinNoise::grad(int hash, float x, float y, float z) {
     return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
 }
 
-void PerlinNoise::reload(unsigned seed) {
+void PerlinNoise3D::reload(unsigned seed) {
     is_init = false;
     p.resize(256);
     std::iota(p.begin(), p.end(), 0);
@@ -79,4 +79,59 @@ void PerlinNoise::reload(unsigned seed) {
     is_init = true;
 }
 
+void PerlinNoise2D::init(unsigned seed) {
+    p.resize(256);
+    std::iota(p.begin(), p.end(), 0);
+    Logger::info("Init Perlin Noise With Seed {}", seed);
+    std::shuffle(p.begin(), p.end(), std::mt19937(seed));
+
+    p.insert(p.end(), p.begin(), p.end()); // 扩展到 512，方便索引
+    is_init = true;
+}
+
+float PerlinNoise2D::noise(float x, float y) {
+    ASSERT_MSG(is_init, "The PerlinNoise2D don't init!");
+
+    int ix = static_cast<int>(std::floor(x)) & 255;
+    int iy = static_cast<int>(std::floor(y)) & 255;
+
+    x -= std::floor(x);
+    y -= std::floor(y);
+
+    float u = fade(x);
+    float v = fade(y);
+
+    int a = p[ix] + iy;
+    int b = p[ix + 1] + iy;
+
+    float res =
+        lerp(v, lerp(u, grad(p[a], x, y), grad(p[b], x - 1, y)),
+             lerp(u, grad(p[a + 1], x, y - 1), grad(p[b + 1], x - 1, y - 1)));
+
+    return (res + 1.0f) / 2.0f; // 映射到 [0, 1]
+}
+
+float PerlinNoise2D::fade(float t) {
+    return t * t * t * (t * (t * 6 - 15) + 10);
+}
+
+float PerlinNoise2D::lerp(float t, float a, float b) { return a + t * (b - a); }
+
+float PerlinNoise2D::grad(int hash, float x, float y) {
+    int h = hash & 3; // 使用低 2 位选择 4 个梯度方向
+    float u = (h & 1) ? -x : x;
+    float v = (h & 2) ? -y : y;
+    return u + v;
+}
+
+void PerlinNoise2D::reload(unsigned seed) {
+    is_init = false;
+    p.resize(256);
+    std::iota(p.begin(), p.end(), 0);
+    Logger::info("Reload Perlin Noise With Seed {}", seed);
+    std::shuffle(p.begin(), p.end(), std::mt19937(seed));
+
+    p.insert(p.end(), p.begin(), p.end());
+    is_init = true;
+}
 } // namespace Cubed