fix: .gitignore + add 44 language JSON files

Engine/Terrain/terrain.h

@@ -0,0 +1,54 @@
+#pragma once
+
+// ============================================================================
+// terrain.h - 程序化地形
+// ============================================================================
+
+#include <d3d11.h>
+#include "../Rendering/mesh.h"
+
+#define TERRAIN_MAX_HEIGHTMAP_SIZE 256
+
+typedef struct {
+    float* data;
+    int size;
+} TerrainHeightmap;
+
+typedef struct {
+    int chunks_x;
+    int chunks_z;
+    int vertices_per_chunk;
+    float chunk_size;
+    float height_scale;
+    float uv_scale;
+} TerrainConfig;
+
+typedef struct {
+    TerrainConfig config;
+    TerrainHeightmap heightmap;
+    Mesh* mesh;
+    ID3D11Device* device;
+} Terrain;
+
+// 默认配置
+TerrainConfig terrain_default_config(void);
+
+// 高度图
+TerrainHeightmap terrain_heightmap_create(int size);
+void terrain_heightmap_destroy(TerrainHeightmap* hm);
+void terrain_heightmap_fill_noise(TerrainHeightmap* hm, int seed, float scale, float amplitude);
+float terrain_heightmap_sample(const TerrainHeightmap* hm, float x, float z);
+
+// 地形对象
+Terrain* terrain_create(ID3D11Device* dev, const TerrainConfig* config);
+void terrain_destroy(Terrain* terrain);
+
+// 从世界坐标采样高度 (用于相机/角色贴地)
+float terrain_get_height(const Terrain* terrain, float world_x, float world_z);
+
+// 网格生成
+Mesh* terrain_mesh_create(ID3D11Device* dev, const TerrainHeightmap* hm, float size, float height_scale, float uv_scale);
+
+// 噪声工具（供分块管理器复用）
+float hash_noise(int x, int z, int seed);
+float fbm_noise(float x, float z, int seed, int octaves, float persistence);