CelticCraft/Plugins/VoxelFree/Source/Voxel/Public/VoxelSpawners/VoxelMeshSpawner.h

// Copyright 2020 Phyronnaz

#pragma once

#include "CoreMinimal.h"
#include "VoxelSpawners/VoxelBasicSpawner.h"
#include "VoxelSpawners/VoxelInstancedMeshSettings.h"
#include "Templates/SubclassOf.h"
#include "Engine/EngineTypes.h"
#include "VoxelMeshSpawner.generated.h"

class FVoxelConstDataAccelerator;
class FVoxelMeshSpawnerProxy;
class FVoxelMeshSpawnerGroupProxy;
struct FVoxelInstancedMeshInstancesRef;
class UStaticMesh;
class UVoxelMeshSpawnerBase;
class UVoxelMeshSpawnerGroup;
class UVoxelHierarchicalInstancedStaticMeshComponent;
enum class EVoxelMeshSpawnerInstanceRandom : uint8;


UENUM()
enum class EVoxelMeshSpawnerInstanceRandom : uint8
{
	// Random number
	// Use GetVoxelSpawnerActorInstanceRandom to get it
	// Will have the same value in the spawned actor as in the instance
	Random,
	// Get the voxel material in the shader
	// Use GetVoxelMaterialFromInstanceRandom
	VoxelMaterial,
	// Get a voxel graph output color in the shader
	// Use GetColorFromInstanceRandom
	ColorOutput
};

UCLASS(Abstract)
class VOXEL_API UVoxelMeshSpawnerBase : public UVoxelBasicSpawner
{
	GENERATED_BODY()

public:
	// What to send through InstanceRandom
	// Check enum values tooltips
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "General Settings")
	EVoxelMeshSpawnerInstanceRandom InstanceRandom = EVoxelMeshSpawnerInstanceRandom::Random;
	
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "General Settings")
	FName ColorOutputName;
	
	// Actor to spawn to replace the instanced mesh. After spawn, the SetStaticMesh event will be called on the actor with Mesh as argument
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Actor Settings", meta = (ShowOnlyInnerProperties))
	FVoxelSpawnerActorSettings ActorSettings;

	// Will always spawn an actor instead of an instanced mesh
	UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, Category = "Actor Settings")
	bool bAlwaysSpawnActor = false;

public:
	UPROPERTY(EditAnywhere, Category = "Instance Settings", meta = (ShowOnlyInnerProperties))
	FVoxelInstancedMeshSettings InstancedMeshSettings;
	
public:
	// In local space. Increase this if your foliage is enabling physics too soon. In cm
	UPROPERTY(EditAnywhere, Category = "Placement - Offset")
	FVector FloatingDetectionOffset = FVector(0, 0, -10);

protected:
	//~ Begin UObject Interface
	virtual void Serialize(FArchive& Ar) override;
	//~ End UObject Interface
};

UCLASS()
class VOXEL_API UVoxelMeshSpawner : public UVoxelMeshSpawnerBase
{
	GENERATED_BODY()

public:
	// Mesh to spawn. Can be left to null if AlwaysSpawnActor is true
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "General Settings")
	TObjectPtr<UStaticMesh> Mesh = nullptr;

	// Per mesh section
	UPROPERTY(EditAnywhere, BlueprintReadWrite, AdvancedDisplay, Category = "General Settings")
	TMap<int32, TObjectPtr<UMaterialInterface>> MaterialsOverrides;
	
public:
	//~ Begin UVoxelSpawner Interface
#if WITH_EDITOR
	virtual bool NeedsToRebuild(UObject* Object, const FPropertyChangedEvent& PropertyChangedEvent) override;
#endif
};

UCLASS()
class VOXEL_API UVoxelMeshSpawnerGroup : public UVoxelMeshSpawnerBase
{
	GENERATED_BODY()

public:
	// Meshes to spawn. Can be left to null if AlwaysSpawnActor is true
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "General Settings")
	TArray<TObjectPtr<UStaticMesh>> Meshes;
	
public:
#if WITH_EDITOR
	virtual bool NeedsToRebuild(UObject* Object, const FPropertyChangedEvent& PropertyChangedEvent) override;
#endif
};