graphite/engine/ecs/include/component.hpp

#pragma once

#include <glm/glm.hpp>
#include <glm/gtx/quaternion.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtx/matrix_decompose.hpp>

#include <interdata.hpp>
#include <utility.hpp>

struct DebugResult
{
    struct DebugCube
    {
        DebugCube(glm::vec3 o, glm::vec3 s) : origin(o), size(s) {}

        glm::vec3 origin, size;
    };

    void AddCube(glm::vec3 origin, glm::vec3 size)
    {
        debugCubes.push_back(DebugCube(origin, size));
    }

    std::vector<DebugCube> debugCubes;
};

class Entity;

class Component
{
friend class EntityPool;

public:
    virtual void Load(IntermediateData&) {}
    virtual void Save(IntermediateData&) {}

    virtual DebugResult DrawDebug() { return DebugResult(); }

    virtual std::vector<int> RequiredAssets()
    {
        return std::vector<int>();
    }

	Entity* GetEntity()
    {
		return entity_handle;
	}

protected:
	void SetEntity(Entity* entity)
    {
		entity_handle = entity;
	}

private:
	Entity* entity_handle = nullptr;
};

class Transform : public Component
{
public:
	void Load(IntermediateData& data) override
    {
        position = data["position"];
        orientation = data["orientation"];
        scale = data["scale"];

        parentID = data["parent"];
    }

    void Save(IntermediateData& data) override
    {
        data["position"] = position;
        data["orientation"] = orientation;
        data["scale"] = scale;

        data["parent"] = parentID;
    }

    Transform* GetParent();
    void SetParent(Transform* transform);

    void SetEulerAngles(const glm::vec3& rot)
    {
        orientation = glm::quat(glm::vec3(glm::radians(rot.x), glm::radians(rot.y), glm::radians(rot.z)));
    }

    glm::vec3 GetEulerAngles()
    {
        glm::vec3 euler = glm::eulerAngles(orientation);
        return glm::vec3(glm::degrees(euler.x), glm::degrees(euler.y), glm::degrees(euler.z));
    }

    glm::quat GetWorldOrientation()
    {
        glm::quat first = orientation;
        glm::quat second;

        if(GetParent() != nullptr)
            second = GetParent()->orientation;

        return second * first;
    }

    glm::vec3 GetWorldPosition()
    {
        return GetModel() * glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
    }

    glm::vec3 GetForward()
    {
        return GetWorldOrientation() * glm::vec3(0.0f, 0.0f, 1.0f);
    }

    glm::vec3 GetUp()
    {
        return GetWorldOrientation() * glm::vec3(0.0f, 1.0f, 0.0f);
    }

    glm::vec3 GetRight()
    {
        return GetWorldOrientation() * glm::vec3(1.0f, 0.0f, 0.0f);
    }

    glm::mat4 GetModel()
    {
        glm::mat4 tmp(1.0f);

        Transform* parent = GetParent();
        if(parent != nullptr)
        {
            tmp = glm::translate(tmp, parent->position);
            tmp *= glm::toMat4(parent->orientation);
            tmp = glm::scale(tmp, parent->scale);
        }

        tmp = glm::translate(tmp, position);
        tmp *= glm::toMat4(orientation);
        tmp = glm::scale(tmp, scale);

        return tmp;
    }

    std::vector<Transform*> GetChildren();

    glm::vec3 position = glm::vec3(0);
    glm::quat orientation = glm::quat();
    glm::vec3 scale = glm::vec3(1);

    int parentID = 0;
};

class MeshRenderer : public Component
{
public:
	void Load(IntermediateData& data) override
    {
        meshID = data["meshid"];
        materialID = data["matid"];
        isStaticGeometry = data["static"];
    }

    void Save(IntermediateData& data) override
    {
        data["meshid"] = meshID;
        data["matid"] = materialID;
        data["static"] = isStaticGeometry;
    }

    std::vector<int> RequiredAssets() override
    {
    	return { meshID, materialID };
    }

    int meshID = 0;
    int materialID = 0;
    bool isStaticGeometry = false;
};

class Light : public Component
{
public:
    void Load(IntermediateData& data) override
    {
        color = data["color"];
        radius = data["radius"];
        type = data["type"];
        shadowsEnabled = data["shadows"];
        shadowFrustumSize = data["shadowsize"];
        shadowZFar = data["shadowfar"];
    }

    void Save(IntermediateData& data) override
    {
        data["color"] = color;
        data["radius"] = radius;
        data["type"] = type;
        data["shadows"] = shadowsEnabled;
        data["shadowsize"] = shadowFrustumSize;
        data["shadowfar"] = shadowZFar;
    }

    glm::mat4 GetProjection()
    {
        return glm::ortho(-shadowFrustumSize, shadowFrustumSize, -shadowFrustumSize, shadowFrustumSize, 0.1f, shadowZFar);
    }

    glm::vec3 color = glm::vec3(1);
    float radius = 15.0f;

    enum Type
    {
        Directional = 0,
        Point = 1
    };

    int type = Point;
    bool shadowsEnabled = false;
    float shadowFrustumSize = 25.0f;
    float shadowZFar = 50.0f;
};

class Camera : public Component
{
public:
    void Load(IntermediateData& data) override
    {
        fieldOfView = static_cast<float>(data["fov"]);
    }

    void Save(IntermediateData& data) override
    {
        data["fov"] = static_cast<float>(fieldOfView);
    }

    glm::mat4 GetProjection();
    glm::mat4 GetView();

    float fieldOfView = 45.0f;
};

class ScriptActor : public Component
{
public:
    void Load(IntermediateData& data) override
    {
        scriptPath = std::string(data["scriptpath"]);
    }

    void Save(IntermediateData& data) override
    {
        data["scriptpath"] = scriptPath;
    }

    std::string scriptPath;
    bool intialized = false;
};

class btRigidBody;
class btCollisionShape;

class Rigidbody : public Component
{
    friend class RigidbodyInspector;

public:
    void Load(IntermediateData& data) override
    {
        m_mass = data["mass"];
        m_friction = data["friction"];

        m_enableRotation = data["enablerotation"];
        m_kinematic = data["kinematic"];
        m_enableDeactivation = data["enabledeactivation"];
    }

    void Save(IntermediateData& data) override
    {
        data["mass"] = m_mass;
        data["friction"] = m_friction;

        data["enablerotation"] = m_enableRotation;
        data["kinematic"] = m_kinematic;
        data["enabledeactivation"] = m_enableDeactivation;
    }

    void SetMass(float m)
    {
        m_mass = m;
        isDirty = true;
    }

    float GetMass()
    {
        return m_mass;
    }

    void SetFriction(float f)
    {
        m_friction = f;
        isDirty = true;
    }

    float GetFriction() {
        return m_friction;
    }

    void EnableKinematic(bool k)
    {
        m_kinematic = k;
        isDirty = true;
    }

    bool IsKinematic()
    {
        return m_kinematic;
    }

    void EnableDeactivation(bool d)
    {
        m_enableDeactivation = d;
        isDirty = true;
    }

    bool IsDeactivationEnabled()
    {
        return m_enableDeactivation;
    }

    void SetRotation(bool r)
    {
        m_enableRotation = r;
        isDirty = true;
    }

    bool IsRotationEnabled()
    {
        return m_enableRotation;
    }

    void AddForce(glm::vec3 dir)
    {
        m_force += dir;
    }

    void SetForce(glm::vec3 val)
    {
        m_force = val;
    }

    glm::vec3 GetForce()
    {
        return m_force;
    }

    bool isDirty = true;

    btRigidBody* rigidbody = nullptr;

private:
    bool m_kinematic = false;
    bool m_enableDeactivation = true;
    bool m_enableRotation = true;

    float m_mass = 10;
    float m_friction = 1.0f;

    glm::vec3 m_force;
};

class Collider : public Component
{
public:
    btCollisionShape* collisionShape;
    bool isDirty = true;
};

class BoxCollider : public Collider
{
    friend class BoxColliderInspector;

public:
    void Load(IntermediateData& data) override
    {
        m_size = data["boxsize"];
        m_origin = data["boxorigin"];
    }

    void Save(IntermediateData& data) override
    {
        data["boxsize"] = m_size;
        data["boxorigin"] = m_origin;
    }

    DebugResult DrawDebug() override
    {
        DebugResult result;
        result.AddCube(m_origin, m_size);

        return result;
    }

    void SetOrigin(glm::vec3 origin)
    {
        m_origin = origin;
        isDirty = true;
    }

    glm::vec3 GetOrigin()
    {
        return m_origin;
    }

    void SetSize(glm::vec3 size)
    {
        m_size = size;
        isDirty = true;
    }

    glm::vec3 GetSize()
    {
        return m_size;
    }

private:
    glm::vec3 m_size = glm::vec3(1);
    glm::vec3 m_origin = glm::vec3(0);
};

class CapsuleCollider : public Collider
{
public:
    void Load(IntermediateData& data) override
    {
        m_height = data["height"];
    }

    void Save(IntermediateData& data) override
    {
        data["height"] = m_height;
    }

    void SetHeight(float val)
    {
        m_height = val;
        isDirty = true;
    }

    float GetHeight()
    {
        return m_height;
    }

private:
    float m_height = 1.0f;
};

class PlayerStart : public Component
{
public:

};

class Player : public Component
{
public:
    bool initialized = false;
    glm::vec3 previousDirection;
};

class PlayerCamera : public Component
{
public:
    float yaw = 0, pitch = 0;
    float lastxoffset = 0, lastyoffset = 0;
    float lastYaw = 0, lastPitch = 0;
};

/*
 * Used for dynamic environment mapping (objects that are in the scene)
 */
class EnvironmentProbe : public Component
{
public:

};