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#pragma once
#include "Configuration/UnityConfigure.h"
#if ENABLE_TERRAIN
#include "Runtime/Math/Vector3.h"
#include "Runtime/Geometry/AABB.h"
#include "TerrainData.h"
#include "Runtime/Filters/Mesh/LodMesh.h"
#include "Runtime/Shaders/Material.h"
#include "SplatMaterials.h"
#define TERRAIN_PREFER_VBO_OVER_MESH
class Camera;
enum
{
kVisibilityLoddedAway = 0,
kVisibilityDrawChild = 1,
kVisibilityDrawSelf = 2
};
struct QuadTreeNode
{
#ifdef TERRAIN_PREFER_VBO_OVER_MESH
VBO *vbo;
SubMesh subMesh;
#else
Mesh *mesh;
#endif
int edgeMask;
float maxHeightError;
int visibility;
int oldVisibility;
int x;
int y;
int level;
AABB bounds;
bool useSplatmap : 1;
#ifdef TERRAIN_PREFER_VBO_OVER_MESH
bool updateMesh : 1;
bool updateIndices : 1;
#endif
QuadTreeNode()
{
edgeMask = -1;
maxHeightError = 1;
visibility = kVisibilityLoddedAway;
oldVisibility = kVisibilityLoddedAway;
#ifdef TERRAIN_PREFER_VBO_OVER_MESH
vbo = NULL;
updateMesh = false;
updateIndices = false;
#else
mesh = NULL;
#endif
}
~QuadTreeNode()
{
#ifdef TERRAIN_PREFER_VBO_OVER_MESH
AssertIf(vbo != NULL);
#else
DestroySingleObject(mesh);
#endif
}
};
class TerrainRenderer
{
public:
TerrainRenderer *m_TopNeighbor;
TerrainRenderer *m_RightNeighbor;
TerrainRenderer *m_BottomNeighbor;
TerrainRenderer *m_LeftNeighbor;
Vector3f m_Scale;
std::vector<QuadTreeNode> m_Quadtree;
int m_Levels;
SplatMaterials *m_SplatMaterials;
Vector3f m_Position;
bool m_CastShadows;
Vector3f m_CachedCameraPosition;
int m_CachedMaxLodLevel;
float m_CachedkC;
float m_CachedSqrSplatDistance;
TerrainRenderer (SInt32 instanceID, PPtr<TerrainData> terrainData, const Vector3f &position, int lightmapIndex);
~TerrainRenderer ();
void RenderStep1 (Camera *camera, int maxLodLevel, float tau, float splatDistance);
void RenderStep2 ();
void RenderStep3 (Camera *camera, int layer, bool castShadow, Material* mat);
void ReloadAll ();
void Cleanup ();
void UnloadVBOFromGfxDevice ();
void ReloadVBOToGfxDevice ();
void ReloadPrecomputedError ();
void ReloadBounds ();
void RecursiveCalculateLod (QuadTreeNode &node);
void SetNeighbors (TerrainRenderer *left, TerrainRenderer *top, TerrainRenderer *right, TerrainRenderer *bottom);
PPtr<TerrainData> GetTerrainData() const { return m_TerrainData; }
void SetTerrainData(PPtr<TerrainData> value);
int GetLightmapIndex() { return m_LightmapIndex; }
void SetLightmapIndex(int value) { m_LightmapIndex = value; }
std::vector<Mesh*> GetMeshPatches();
#if UNITY_EDITOR
void SetLightmapSize(int lightmapSize) { m_LightmapSize = lightmapSize; }
#endif
private:
int m_CurrentLayer;
Camera *m_CurrentCamera;
Material *m_CurrentBaseMaterial;
int m_CurrentMaterialCount;
Material **m_CurrentMaterials;
PPtr<TerrainData> m_TerrainData;
int m_LightmapIndex;
#if UNITY_EDITOR
SInt32 m_InstanceID;
int m_LightmapSize;
#endif
std::list<VBO*> m_FreeVBOPool;
VBO* CreateVBO();
void ReclaimVBO(VBO* vbo);
QuadTreeNode &GetRootNode() { return m_Quadtree.back(); }
bool IsRootNode (const QuadTreeNode& node) { return (node.level == GetRootNode().level); }
int GetIndex (int x, int y, int level);
QuadTreeNode *GetNode (int x, int y, int level);
QuadTreeNode *GetNodeAndRenderer (int x, int y, int level, TerrainRenderer *&renderer);
int GetPatchCountX (int level);
int GetPatchCountY (int level);
void RebuildNodes ();
Vector3f GetNodePosition (QuadTreeNode &node);
int CalculateEdgeMask (QuadTreeNode &node);
QuadTreeNode *FindNeighbor (QuadTreeNode &node, int direction);
QuadTreeNode *FindNeighborAndRenderer (QuadTreeNode &node, int direction, TerrainRenderer *&renderer);
QuadTreeNode *FindChild (QuadTreeNode &node, int direction);
QuadTreeNode *FindParent (QuadTreeNode &node);
void CleanupMeshes ();
static float CalculateSqrDistance (Vector3f &rkPoint, AABB &rkBox);
void MarkChildVisibilityRecurse (QuadTreeNode &node, int newVisibility);
void ForceSplitParent (QuadTreeNode &node);
void EnforceLodTransitions (QuadTreeNode &node);
void RemoveMesh (QuadTreeNode &node);
void RecursiveRemoveMeshes (QuadTreeNode &node);
void RenderNode (QuadTreeNode &node);
void BuildRenderer (QuadTreeNode &node, int edgeMask);
void RecursiveRenderMeshes (QuadTreeNode &node, Heightmap &heightmap);
friend class QuadTreeNodeRenderer;
};
#endif // ENABLE_TERRAIN
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