feat(gameplay): add Ocean biome with water generation and heightmap adjustments

- Introduce Ocean biome enum, builder, and detection logic.
- Add ocean water building to all existing biomes and modify heightmap thresholds for low mountainous areas.
- Skip cave and river generation in Ocean (and River) biomes; avoid carving water blocks.
- Comment out border blending call and update block fill logic.

CMakeLists.txt

@@ -124,6 +124,7 @@ add_executable(${PROJECT_NAME}
     src/gameplay/river_path.cpp
     src/block.cpp
     src/gameplay/vertex_data.cpp
+    src/gameplay/builders/ocean_builder.cpp
 )
 
 if(CMAKE_BUILD_TYPE STREQUAL "Debug")

include/Cubed/gameplay/biome.hpp

@@ -15,6 +15,7 @@ enum class BiomeType {
     MOUNTAIN,
     RIVER,
     SNOWY_PLAIN,
+    OCEAN,
     NONE
 };
 

include/Cubed/gameplay/builders/biome_builder.hpp

@@ -13,5 +13,6 @@ public:
 protected:
     void build_bottom();
     void place_grass();
+    void ocean_water_build();
 };
 } // namespace Cubed

include/Cubed/gameplay/builders/ocean_builder.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#pragma once
+
+#include "Cubed/gameplay/builders/biome_builder.hpp"
+namespace Cubed {
+
+class ChunkGenerator;
+
+class OceanBuilder : public BiomeBuilder {
+public:
+    OceanBuilder(ChunkGenerator& chunk_generator);
+    void build_biome() override;
+    ChunkGenerator& get_chunk_generator() override;
+    void build_vegetation() override;
+
+private:
+    ChunkGenerator& m_chunk_generator;
+
+    void build_blocks();
+};
+
+} // namespace Cubed

src/gameplay/biome.cpp

@@ -62,6 +62,10 @@ std::string get_biome_str(BiomeType biome) {
         break;
     case SNOWY_PLAIN:
         str = "Snowy Plain";
+        break;
+    case OCEAN:
+        str = "Ocean";
+        break;
     case NONE:
         str = "Unknown";
         break;
@@ -190,6 +194,9 @@ BiomeType determine_biome(const BiomeConditions& conditions) {
     if (conditions.mountainous > 0.75) {
         return MOUNTAIN;
     }
+    if (conditions.mountainous < 0.25) {
+        return OCEAN;
+    }
     auto temp = conditions.temp;
     auto humid = conditions.humid;
     if (temp < 0.5) {

src/gameplay/builders/biome_builder.cpp

@@ -39,4 +39,23 @@ void BiomeBuilder::place_grass() {
         }
     }
 }
+
+void BiomeBuilder::ocean_water_build() {
+    ChunkGenerator& chunk_generator = get_chunk_generator();
+    Chunk& chunk = chunk_generator.chunk();
+    auto& blocks = chunk.blocks();
+    const auto& heightmap = chunk.get_heightmap();
+
+    for (int x = 0; x < SIZE_X; ++x) {
+        for (int z = 0; z < SIZE_Z; ++z) {
+            int height = heightmap[x][z];
+            if (height <= SEA_LEVEL) {
+                for (int y = height; y <= SEA_LEVEL; y++) {
+                    blocks[Chunk::index(x, y, z)] = 7;
+                }
+            }
+        }
+    }
+}
+
 } // namespace Cubed

src/gameplay/builders/desert_builder.cpp

@@ -27,6 +27,7 @@ void DesertBuilder::build_blocks() {
             }
         }
     }
+    ocean_water_build();
 }
 
 void DesertBuilder::build_vegetation() {}

src/gameplay/builders/forest_builder.cpp

@@ -32,6 +32,7 @@ void ForestBuilder::build_blocks() {
             m_blocks[Chunk::index(x, height, z)] = 1;
         }
     }
+    ocean_water_build();
 }
 
 void ForestBuilder::build_vegetation() {

src/gameplay/builders/mountain_builder.cpp

@@ -23,6 +23,7 @@ void MountainBuilder::build_blocks() {
             }
         }
     }
+    ocean_water_build();
 }
 
 void MountainBuilder::build_vegetation() {}

src/gameplay/builders/ocean_builder.cpp

@@ -0,0 +1,35 @@
+#include "Cubed/gameplay/builders/ocean_builder.hpp"
+
+#include "Cubed/gameplay/chunk.hpp"
+#include "Cubed/gameplay/chunk_generator.hpp"
+namespace Cubed {
+OceanBuilder::OceanBuilder(ChunkGenerator& chunk_generator)
+    : m_chunk_generator(chunk_generator) {}
+
+void OceanBuilder::build_biome() {
+    BiomeBuilder::build_bottom();
+    build_blocks();
+};
+
+void OceanBuilder::build_blocks() {
+    auto& m_chunk = m_chunk_generator.chunk();
+    auto& m_blocks = m_chunk.blocks();
+    auto& m_heightmap = m_chunk.heightmap();
+    for (int x = 0; x < CHUNK_SIZE; x++) {
+        for (int z = 0; z < CHUNK_SIZE; z++) {
+            int height = static_cast<int>(m_heightmap[x][z]);
+            for (int y = 5; y <= height; y++) {
+                m_blocks[Chunk::index(x, y, z)] = 3;
+            }
+        }
+    }
+    ocean_water_build();
+}
+
+void OceanBuilder::build_vegetation() {}
+
+ChunkGenerator& OceanBuilder::get_chunk_generator() {
+    return m_chunk_generator;
+};
+
+} // namespace Cubed

src/gameplay/builders/plain_builder.cpp

@@ -27,6 +27,7 @@ void PlainBuilder::build_blocks() {
             m_blocks[Chunk::index(x, height, z)] = 1;
         }
     }
+    ocean_water_build();
 }
 
 void PlainBuilder::build_vegetation() { place_grass(); }

src/gameplay/builders/snowy_plain_builder.cpp

@@ -27,6 +27,7 @@ void SnowyPlainBuilder::build_blocks() {
             m_blocks[Chunk::index(x, height, z)] = 8;
         }
     }
+    ocean_water_build();
 }
 
 void SnowyPlainBuilder::build_vegetation() {}

src/gameplay/chunk.cpp

@@ -199,7 +199,7 @@ void Chunk::gen_phase_six(
         Logger::error("ChunkGenerator is Nullptr");
         return;
     }
-    m_generator->blend_surface_blocks_borders(neighbor_block);
+    // m_generator->blend_surface_blocks_borders(neighbor_block);
     m_generator->generate_cave();
     m_generator->generate_river();
 }

src/gameplay/chunk_generator.cpp

@@ -3,6 +3,7 @@
 #include "Cubed/gameplay/builders/desert_builder.hpp"
 #include "Cubed/gameplay/builders/forest_builder.hpp"
 #include "Cubed/gameplay/builders/mountain_builder.hpp"
+#include "Cubed/gameplay/builders/ocean_builder.hpp"
 #include "Cubed/gameplay/builders/plain_builder.hpp"
 #include "Cubed/gameplay/builders/river_builder.hpp"
 #include "Cubed/gameplay/builders/snowy_plain_builder.hpp"
@@ -166,18 +167,43 @@ void ChunkGenerator::generate_heightmap() {
             amplitude = std::lerp(10, 40, t);
             */
             float t;
-            if (mountainous >= 0.7f) {
+            if (mountainous >= 0.95f) {
-                t = Math::smootherstep(0.7f, 0.75, mountainous);
+                t = Math::smootherstep(0.95f, 1.0f, mountainous);
-                base_y = std::lerp(70, 88, t);
+                base_y = std::lerp(130, 140, t);
-                amplitude = std::lerp(28, 48, t);
+                amplitude = std::lerp(38, 48, t);
-            } else if (mountainous >= 0.65f) {
+            } else if (mountainous >= 0.85f) {
-                t = Math::smootherstep(0.65f, 0.7f, mountainous);
+                t = Math::smootherstep(0.85f, 0.95f, mountainous);
-                base_y = std::lerp(66, 70, t);
+                base_y = std::lerp(100, 130, t);
+                amplitude = std::lerp(28, 38, t);
+            } else if (mountainous >= 0.8) {
+                t = Math::smootherstep(0.8f, 0.85f, mountainous);
+                base_y = std::lerp(85, 100, t);
                 amplitude = std::lerp(18, 28, t);
+            } else if (mountainous >= 0.75f) {
+                t = Math::smootherstep(0.75f, 0.8f, mountainous);
+                base_y = std::lerp(70, 85, t);
+                amplitude = std::lerp(6, 18, t);
+            } else if (mountainous >= 0.7) {
+                t = Math::smootherstep(0.7f, 0.75f, mountainous);
+                base_y = std::lerp(66, 70, t);
+                amplitude = std::lerp(6, 6, t);
+
+            } else if (mountainous >= 0.45f) {
+                t = Math::smootherstep(0.45f, 0.7f, mountainous);
+                base_y = std::lerp(64, 66, t);
+                amplitude = std::lerp(6, 6, t);
+            } else if (mountainous >= 0.3f) {
+                t = Math::smootherstep(0.3f, 0.45f, mountainous);
+                base_y = std::lerp(60, 64, t);
+                amplitude = std::lerp(6, 6, t);
+            } else if (mountainous >= 0.25f) {
+                t = Math::smootherstep(0.25f, 0.3f, mountainous);
+                base_y = std::lerp(44, 60, t);
+                amplitude = std::lerp(6, 6, t);
             } else {
-                t = Math::smootherstep(0.55, 0.65, mountainous);
+                t = Math::smootherstep(0.0f, 0.25f, mountainous);
-                base_y = std::lerp(58, 66, t);
+                base_y = std::lerp(35, 44, t);
-                amplitude = std::lerp(8, 18, t);
+                amplitude = std::lerp(3, 6, t);
             }
             heightmap[x][z] =
                 base_y + fbm_height(world_x, world_z, octaves, lacunarity, gain,
@@ -553,10 +579,10 @@ void ChunkGenerator::blend_surface_blocks_borders(
 
                 // bottom block
                 unsigned fill_type = 2;
-                if (final_type == 1) {
+                if (final_type == 1 || final_type == 8) {
                     fill_type = 2;
-                } else if (final_type == 4) {
+                } else {
-                    fill_type = 4;
+                    fill_type = final_type;
                 }
                 for (int y = top_y - 5; y < top_y; y++) {
                     if (fill_type == 7 && y > SEA_LEVEL) {
@@ -600,6 +626,9 @@ void ChunkGenerator::make_biome_builder() {
     case SNOWY_PLAIN:
         m_biome_builder = std::make_unique<SnowyPlainBuilder>(*this);
         break;
+    case OCEAN:
+        m_biome_builder = std::make_unique<OceanBuilder>(*this);
+        break;
     case NONE:
         m_biome_builder = nullptr;
         break;
@@ -617,9 +646,14 @@ void ChunkGenerator::generate_cave() {
     const int CHUNK_MAX_Z = CHUNK_MIN_Z + SIZE_Z - 1;
     const int CHUNK_MIN_Y = 0;
     const int CHUNK_MAX_Y = SIZE_Y - 1;
+
     for (auto& [id, path] : paths) {
         for (const auto& point : path.points()) {
-
+            if ((m_chunk.biome() == BiomeType::RIVER) ||
+                (m_chunk.biome() == BiomeType::OCEAN)) {
+                path.clear_chunk(chunk_pos);
+                continue;
+            }
             const glm::vec3& center = point.pos;
             float rad_xz = point.rad_xz;
             float rad_y = point.rad_y;
@@ -651,6 +685,9 @@ void ChunkGenerator::generate_cave() {
                             if (y == 0) {
                                 continue;
                             }
+                            if (blocks[Chunk::index(x, y, z)] == 7) {
+                                continue;
+                            }
                             blocks[Chunk::index(x, y, z)] = 0;
                         }
                     }
@@ -678,7 +715,8 @@ void ChunkGenerator::generate_river() {
 
     for (auto& [id, path] : paths) {
         for (const auto& point : path.points()) {
-            if (m_chunk.biome() == BiomeType::DESERT) {
+            if ((m_chunk.biome() == BiomeType::DESERT) ||
+                (m_chunk.biome() == BiomeType::OCEAN)) {
                 path.clear_chunk(chunk_pos);
                 continue;
             }