#pragma once

// ============================================================================
// terrain_manager.h - 地形分块流式加载
// ============================================================================

#include "terrain.h"
#include "../Rendering/material.h"
#include "../Rendering/renderer.h"
#include "../ASM/math_c_fallback.h"

#define TERRAIN_MAX_CHUNKS 64

typedef struct {
    int cx;
    int cz;
    Terrain* terrain;
    Material* material;
    int loaded;
} TerrainChunk;

typedef struct {
    TerrainConfig config;
    TerrainChunk chunks[TERRAIN_MAX_CHUNKS];
    int chunk_count;
    int load_radius;
    int seed;
    ID3D11Device* device;
    Material* base_material;
} TerrainManager;

TerrainManager* terrain_manager_create(ID3D11Device* dev, const TerrainConfig* config, Material* base_material);
void terrain_manager_destroy(TerrainManager* tm);

// 根据观察者位置更新分块
void terrain_manager_update(TerrainManager* tm, Vec3 observer_pos);

// 渲染所有已加载分块
void terrain_manager_render(TerrainManager* tm, Renderer* renderer);

// 从世界坐标获取地形高度（在所有已加载分块中采样）
float terrain_manager_get_height(TerrainManager* tm, float world_x, float world_z);