voxelman/meshers/voxel_mesher.h

#ifndef VOXEL_TOOLS_H
#define VOXEL_TOOLS_H

#include "core/color.h"
#include "core/math/rect2.h"
#include "core/math/vector2.h"
#include "core/math/vector3.h"
#include "core/pool_vector.h"
#include "core/reference.h"
#include "core/vector.h"
#include "scene/3d/immediate_geometry.h"
#include "scene/3d/mesh_instance.h"
#include "scene/3d/spatial.h"
#include "scene/main/node.h"
#include "scene/resources/concave_polygon_shape.h"
#include "scene/resources/material.h"
#include "scene/resources/mesh.h"
#include "scene/resources/surface_tool.h"

#include "mesh_utils.h"

#include "../../mesh_data_resource/mesh_data_resource.h"
#include "../library/voxelman_library.h"

const double PI_2 = 3.141592653589793238463 / 2;
const double PI = 3.141592653589793238463;

class VoxelmanLibrary;
class VoxelChunk;

class VoxelMesher : public Reference {
	GDCLASS(VoxelMesher, Reference);

public:
	Ref<VoxelmanLibrary> get_library();
	void set_library(Ref<VoxelmanLibrary> library);

	Ref<Material> get_material();
	void set_material(Ref<Material> material);

	float get_ao_strength() const;
	void set_ao_strength(float value);

	float get_base_light_value() const;
	void set_base_light_value(float value);

	float get_voxel_scale() const;
	void set_voxel_scale(const float voxel_scale);

	int get_lod_size() const;
	void set_lod_size(const int lod_size);

	Rect2 get_uv_margin() const;
	void set_uv_margin(const Rect2 margin);

	void reset();

	void add_chunk_bind(Node *chunk);
	void add_chunk(VoxelChunk *chunk);

	void add_chunk_liquid_bind(Node *chunk);
	void add_chunk_liquid(VoxelChunk *chunk);

	void add_mesh_data_resource(Ref<MeshDataResource> mesh, const Vector3 position = Vector3(0, 0, 0), const Vector3 rotation = Vector3(0, 0, 0), const Vector3 scale = Vector3(1.0, 1.0, 1.0), const Rect2 uv_rect = Rect2(0, 0, 1, 1));
	void add_mesh_data_resource_transform(Ref<MeshDataResource> mesh, const Transform transform, const Rect2 uv_rect = Rect2(0, 0, 1, 1));

	void bake_colors_bind(Node *chunk);
	void bake_colors(VoxelChunk *chunk);
	void _bake_colors(Node *p_chunk);

	void bake_liquid_colors_bind(Node *chunk);
	void bake_liquid_colors(VoxelChunk *chunk);
	void _bake_liquid_colors(Node *p_chunk);

	void build_collider(RID shape) const;

	void bake_lights(MeshInstance *node, Vector<Ref<VoxelLight> > &lights);

	void build_mesh(RID mesh);

	void initialize_mesh_simplify();
	void SimplifyMesh(float quality);
	void SimplifyMeshLossless();
	void UpdateMesh(int iteration);
	void UpdateReferences();
	int RemoveVertexPass(int startTrisCount, int targetTrisCount, double threshold, PoolVector<bool> deleted0, PoolVector<bool> deleted1, int deletedTris);
	void CompactMesh();
	bool AreUVsTheSame(int channel, int indexA, int indexB);
	double VertexError(SymmetricMatrix q, double x, double y, double z);
	double CalculateError(MUVertex vert0, MUVertex vert1, Vector3 *result);
	int UpdateTriangles(int i0, int ia0, MUVertex *v, PoolVector<bool> deleted, int deletedTriangles);
	bool Flipped(Vector3 *p, int i0, int i1, MUVertex *v0, PoolVector<bool> &deleted);
	static Vector3 CalculateBarycentricCoords(Vector3 const &point, Vector3 const &a, Vector3 const &b, Vector3 const &c);
	void InterpolateVertexAttributes(int dst, int i0, int i1, int i2, Vector3 &barycentricCoord);

	static double Min3(double val1, double val2, double val3) {
		return (val1 < val2 ? (val1 < val3 ? val1 : val3) : (val2 < val3 ? val2 : val3));
	}

	PoolVector<Vector3> get_vertices();
	void set_vertices(PoolVector<Vector3> values);
	int get_vertex_count();
	Vector3 get_vertex(int idx);
	void remove_vertex(int idx);
	void add_vertex(Vector3 vertex);

	PoolVector<Vector3> get_normals();
	void set_normals(PoolVector<Vector3> values);
	int get_normal_count();
	Vector3 get_normal(int idx);
	void remove_normal(int idx);
	void add_normal(Vector3 normal);

	PoolVector<Color> get_colors();
	void set_colors(PoolVector<Color> values);
	int get_color_count();
	Color get_color(int idx);
	void remove_color(int idx);
	void add_color(Color color);

	PoolVector<Vector2> get_uvs();
	void set_uvs(PoolVector<Vector2> values);
	int get_uv_count();
	Vector2 get_uv(int idx);
	void remove_uv(int idx);
	void add_uv(Vector2 vector);

	PoolVector<Vector2> get_uv2s();
	void set_uv2s(PoolVector<Vector2> values);
	int get_uv2_count();
	Vector2 get_uv2(int idx);
	void remove_uv2(int idx);
	void add_uv2(Vector2 vector);

	PoolVector<int> get_indices();
	void set_indices(PoolVector<int> values);
	int get_indices_count();
	int get_indice(int idx);
	void remove_indices(int idx);
	void add_indices(int index);

	VoxelMesher(Ref<VoxelmanLibrary> library);
	VoxelMesher();
	~VoxelMesher();

protected:
	static void _bind_methods();

	PoolVector<Vector3> _vertices;
	PoolVector<Vector3> _normals;
	PoolVector<Color> _colors;
	PoolVector<Vector2> _uvs;
	PoolVector<Vector2> _uv2s;
	PoolVector<int> _indices;
	PoolVector<int> _bones;

	PoolVector<MUTriangle> _mu_triangles;
	PoolVector<MUVertex> _mu_vertices;
	PoolVector<MURef> _mu_refs;

	Ref<VoxelmanLibrary> _library;
	Ref<Material> _material;

	float _voxel_scale;
	int _lod_size;

	Ref<SurfaceTool> _surface_tool;

	float _ao_strength;
	float _base_light_value;
	Rect2 _uv_margin;

private:
	double vertexLinkDistanceSqr = std::numeric_limits<double>::epsilon();
	int maxIterationCount;
	double agressiveness;
	bool enableSmartLink;
	bool preserveBorderEdges;
	bool preserveUVSeamEdges;
	bool preserveUVFoldoverEdges;
};

#endif