Merge remote-tracking branch 'origin/master' into Networking

# Conflicts:
#	include/Game/PlayerSystem.h
#	src/Game/Game.cpp
#	src/Game/PlayerSystem.cpp

include/Engine/Collision/Collision.h

@@ -0,0 +1,59 @@
+#ifndef Collision_h__
+#define Collision_h__
+
+//NOTE: Collision.h needs to be #included before <GLFW/glfw3.h>, 
+//because Collision #includes "RawModel.h", which has "Texture.h", which has "OpenGL.h" which must be #included first
+//or you will get "fatal error C1189: #error:  gl.h included before glew.h"
+
+#include <vector>
+
+#include "Core/Ray.h"
+#include "Core/AABB.h"
+#include "Engine/Rendering/RawModel.h"
+#include "Core/Entity.h"
+
+class World;
+struct ComponentWrapper;
+
+namespace Collision
+{
+//Return true if the ray hits the box.
+bool RayAABBIntr(const Ray& ray, const AABB& box);
+bool RayVsAABB(const Ray& ray, const AABB& box);
+//Return true if the ray hits the box, also outputs distance from ray origin to intersection point in [outDistance].
+bool RayVsAABB(const Ray& ray, const AABB& box, float& outDistance);
+
+//Return true if the ray hits any of the triangles in the model. Stops checking when a hit is detected.
+bool RayVsModel(const Ray& ray, 
+    const std::vector<RawModel::Vertex>& modelVertices,
+    const std::vector<unsigned int>& modelIndices);
+//Return true if the ray hits any of the triangles in the model.
+//Also returns the position of the intersection point. Will loop through all the whole model indices.
+bool RayVsModel(const Ray& ray,
+    const std::vector<RawModel::Vertex>& modelVertices,
+    const std::vector<unsigned int>& modelIndices,
+    glm::vec3& outHitPosition);
+//Return true if the ray hits any of the triangles in the model.
+//Also returns the distance from the ray origin to the closest 
+//intersection point, and the barycentric u,v-coordinates. Will loop through all the whole model indices.
+bool RayVsModel(const Ray& ray,
+    const std::vector<RawModel::Vertex>& modelVertices,
+    const std::vector<unsigned int>& modelIndices,
+    float& outDistance,
+    float& outUCoord,
+    float& outVCoord);
+
+//Return true if the boxes are intersecting.
+bool AABBVsAABB(const AABB& a, const AABB& b);
+//Return true if the boxes are intersecting.
+//Also outputs the minimum translation that box [a] would need in order to resolve collision.
+bool AABBVsAABB(const AABB& a, const AABB& b, glm::vec3& minimumTranslation);
+bool IsSameBoxProbably(const AABB& first, const AABB& second, const float epsilon = 0.0001f);
+
+//Returns true if the entity has a boundingbox. Outputs the aabb in [outBox].
+bool GetEntityBox(World* world, EntityID entity, AABB& outBox, bool forceBoxFromModel = false);
+bool GetEntityBox(World* world, ComponentWrapper& AABBComponent, AABB& outBox);
+
+}
+
+#endif

include/Engine/Collision/CollisionSystem.h

@@ -0,0 +1,31 @@
+#ifndef CollisionSystem_h__
+#define CollisionSystem_h__
+
+#include <GLFW/glfw3.h>
+#include <glm/common.hpp>
+
+#include "Common.h"
+#include "Core/System.h"
+#include "Core/EventBroker.h"
+#include "Core/EKeyUp.h"
+
+class CollisionSystem : public PureSystem
+{
+public:
+    CollisionSystem(EventBroker* eventBroker)
+        : PureSystem(eventBroker, "AABB")
+        , zPress(false)
+    {
+        //TODO: Debug stuff, remove later.
+        EVENT_SUBSCRIBE_MEMBER(m_EKeyUp, &CollisionSystem::OnKeyUp);
+    }
+
+    virtual void UpdateComponent(World* world, ComponentWrapper& cAABB, double dt) override;
+
+private:
+    bool zPress;
+    EventRelay<CollisionSystem, Events::KeyUp> m_EKeyUp;
+    bool OnKeyUp(const Events::KeyUp &event);
+};
+
+#endif

include/Engine/Collision/ETrigger.h

@@ -0,0 +1,39 @@
+#ifndef Events_TriggerEnter_h__
+#define Events_TriggerEnter_h__
+
+#include "../Core/EventBroker.h"
+#include "../Core/Entity.h"
+
+namespace Events
+{
+
+/** Thrown once, when an entity is only touching a trigger. */
+struct TriggerTouch : Event
+{
+    /** The id of the entity that touches the trigger. */
+    EntityID Entity;
+    /** The id of the trigger entity. */
+    EntityID Trigger;
+};
+
+/** Thrown once, when an entity has completely left a trigger. */
+struct TriggerLeave : Event
+{
+    /** The id of the entity that left the trigger. */
+    EntityID Entity;
+    /** The id of the trigger entity. */
+    EntityID Trigger;
+};
+
+/** Thrown once, when an entity is completely contained inside a trigger. */
+struct TriggerEnter : Event
+{
+    /** The id of the entity that entered the trigger. */
+    EntityID Entity;
+    /** The id of the trigger entity. */
+    EntityID Trigger;
+};
+
+}
+
+#endif

include/Engine/Collision/TriggerSystem.h

@@ -0,0 +1,38 @@
+#ifndef TriggerSystem_h__
+#define TriggerSystem_h__
+
+#include <glm/common.hpp>
+#include <unordered_set>
+
+#include "Core/System.h"
+#include "Core/EventBroker.h"
+#include "ETrigger.h"
+
+class AABB;
+
+class TriggerSystem : public PureSystem
+{
+public:
+    TriggerSystem(EventBroker* eventBroker)
+        : PureSystem(eventBroker, "Trigger")
+    {}
+
+    virtual void UpdateComponent(World* world, ComponentWrapper& collision, double dt) override;
+
+private:
+    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesTouchingTrigger;
+    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesCompletelyInTrigger;
+
+    //True if leave event was thrown.
+    bool throwLeaveIfWasInTrigger(std::unordered_set<EntityID>& triggerSet, EntityID pId, EntityID tId);
+    template<typename Event>
+    void publish(EntityID pId, EntityID tId)
+    {
+        Event e;
+        e.Trigger = tId;
+        e.Entity = pId;
+        m_EventBroker->Publish(e);
+    }
+};
+
+#endif

include/Engine/Common.h

@@ -4,4 +4,5 @@
 #include <map>
 #include <unordered_map>
 
-#include "Core/Util/Logging.h"
+#include "Core/Util/Logging.h"
+#include "Core/Util/IfDebug.h"

include/Engine/Core/AABB.h

@@ -0,0 +1,29 @@
+#ifndef AABB_h__
+#define AABB_h__
+
+#include "../GLM.h"
+
+class AABB
+{
+public:
+    AABB() = default;
+    //No checks are made. Values in minPos must be less than values in maxPos, i.e. min.x < max.x, etc.
+    AABB(const glm::vec3& minPos, const glm::vec3& maxPos);
+    AABB(const glm::vec4& minPos, const glm::vec4& maxPos);
+    //No checks are made. Size must consist of non-negative numbers.
+    virtual void CreateFromCenter(const glm::vec3& center, const glm::vec3& size);
+    virtual ~AABB();
+
+    const glm::vec3& MinCorner() const { return m_MinCorner; }
+    const glm::vec3& MaxCorner() const { return m_MaxCorner; }
+    const glm::vec3& Center() const { return m_Center; }
+    const glm::vec3 Size() const { return 2.0f * m_HalfSize; }
+    const glm::vec3& HalfSize() const { return m_HalfSize; }
+private:
+    glm::vec3 m_MinCorner;
+    glm::vec3 m_MaxCorner;
+    glm::vec3 m_Center;
+    glm::vec3 m_HalfSize;
+};
+
+#endif

include/Engine/Core/ComponentPool.h

@@ -20,7 +20,7 @@ public:
 	~ComponentPoolForwardIterator() = default;
 	ComponentPoolForwardIterator& operator=(const ComponentPoolForwardIterator& other) = default;
 	ComponentPoolForwardIterator& operator++();
-	ComponentPoolForwardIterator& operator++(int);
+	ComponentPoolForwardIterator operator++(int);
 	bool operator!=(const ComponentPoolForwardIterator& other) const;
 	bool operator==(const ComponentPoolForwardIterator& other) const;
 	ComponentWrapper operator*() const;

include/Engine/Core/EFileDropped.h

@@ -0,0 +1,16 @@
+#ifndef EFileDropped_h__
+#define EFileDropped_h__
+
+#include "EventBroker.h"
+
+namespace Events
+{
+
+struct FileDropped : Event
+{
+    std::string Path;
+};
+
+}
+
+#endif

include/Engine/Core/InputManager.h

@@ -16,6 +16,7 @@
 #include "ELockMouse.h"
 #include "EGamepadAxis.h"
 #include "EGamepadButton.h"
+#include "EFileDropped.h"
 
 class InputManager
 {
@@ -71,6 +72,8 @@ private:
     static void GLFWCharCallback(GLFWwindow* window, unsigned int c);
     static std::vector<std::pair<double, double>> GLFWScrollCallbackQueue;
     static void GLFWScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
+    static std::vector<std::string> GLFWDropCallbackQueue;
+    static void GLFWDropCallback(GLFWwindow* window, int count, const char* paths[]);
 };
 
 #endif

include/Engine/Core/MemoryPool.h

@@ -253,7 +253,7 @@ public:
 	}
 
 	//Postfix increment i.e. iter++. Prefer pre-increment (++iter) for efficiency.
-	MemoryPoolForwardIterator& operator++(int)
+	MemoryPoolForwardIterator operator++(int)
 	{
 		MemoryPoolForwardIterator<T> copyIter(*this);
 		operator++();

include/Engine/Core/OctTree.h

@@ -0,0 +1,104 @@
+#ifndef OctTree_h__
+#define OctTree_h__
+
+#include "Core/AABB.h"
+
+class Ray;
+
+class OctTree
+{
+public:
+    struct Output
+    {
+        float CollideDistance;
+    };
+
+    OctTree();
+    ~OctTree();
+    //For the root OctTree, [octTreeBounds] should be a box containing the entire level.
+    OctTree(const AABB& octTreeBounds, int subDivisions);
+
+    //We cannot copy the OctTree as of now, because of the recursive dynamic allocation.
+    //Define these if the OctTree suddenly needs to be copied, think of the children OctChild* ptrs. 
+    OctTree(const OctTree& other) = delete;
+    OctTree(const OctTree&& other) = delete;
+    OctTree& operator= (const OctTree& other) = delete;
+    //Add a dynamic object (one that moves around) into the tree.
+    void AddDynamicObject(const AABB& box);
+    //Add a static object (that does not move) into the tree.
+    void AddStaticObject(const AABB& box);
+    //Get the boxes that are in the same area as the input [box], the boxes are put in [outBoxes].
+    void BoxesInSameRegion(const AABB& box, std::vector<AABB>& outBoxes);
+    //Empty the tree of all objects, static and dynamic.
+    void ClearObjects();
+    //Empty the tree of all dynamic objects. Static objects remain in the tree.
+    void ClearDynamicObjects();
+
+    //Returns true if the ray collides with something in the tree. Result is written to [data].
+    bool RayCollides(const Ray& ray, Output& data);
+    //Returns true if the box collides with something in the tree. 
+    //On collision with a box, that box is written to [outBoxIntersected].
+    //Note: More efficient than calling BoxesInSameRegion from outside and testing there.
+    bool BoxCollides(const AABB& boxToTest, AABB& outBoxIntersected);
+
+private:
+    struct OctChild;    //Fwd declaration;
+    struct ContainedObject
+    {
+        ContainedObject()
+            : Box(AABB())
+            , Checked(false)
+        {}
+        ContainedObject(AABB box)
+            : Box(box)
+            , Checked(false)
+        {}
+        AABB Box;
+        bool Checked;
+    };
+    OctChild* m_Root;
+    std::vector<ContainedObject> m_StaticObjects;
+    std::vector<ContainedObject> m_DynamicObjects;
+
+    bool m_UpdatedOnce;
+    unsigned int m_BoxID;
+    glm::vec3 m_PrevPos;
+    glm::quat m_PrevOri;
+
+    void falsifyObjectChecks();
+
+    struct OctChild
+    {
+        ~OctChild();
+        OctChild(const AABB& octTreeBounds, 
+            int subDivisions, 
+            std::vector<OctTree::ContainedObject>& staticObjects, 
+            std::vector<OctTree::ContainedObject>& dynamicObjects);
+        OctChild(const OctChild& other) = delete;
+        OctChild(const OctChild&& other) = delete;
+        OctChild& operator= (const OctChild& other) = delete;
+        void AddDynamicObject(const AABB& box);
+        void AddStaticObject(const AABB& box);
+        void BoxesInSameRegion(const AABB& box, std::vector<AABB>& outBoxes) const;
+        void ClearObjects();
+        void ClearDynamicObjects();
+        bool RayCollides(const Ray& ray, Output& data) const;
+        bool BoxCollides(const AABB& boxToTest, AABB& outBoxIntersected) const;
+
+        OctChild* m_Children[8];
+        //Indices into the lists in OctTree.
+        std::vector<int> m_StaticObjIndices;
+        std::vector<int> m_DynamicObjIndices;
+        AABB m_Box;
+        //Reference to the lists in OctTree.
+        std::vector<OctTree::ContainedObject>& m_StaticObjectsRef;
+        std::vector<OctTree::ContainedObject>& m_DynamicObjectsRef;
+
+        inline bool hasChildren() const;
+        int childIndexContainingPoint(const glm::vec3& point) const;
+        std::vector<int> childIndicesContainingBox(const AABB& box) const;
+    };
+};
+
+
+#endif

include/Engine/Core/Ray.h

@@ -0,0 +1,31 @@
+#ifndef Ray_h__
+#define Ray_h__
+
+#include "../GLM.h"
+#include "Common.h"
+
+class Ray
+{
+public:
+    Ray(const glm::vec3& origin, const glm::vec3& dir)
+        : m_Origin(origin)
+        , m_Direction(glm::normalize(dir))
+    {
+        DEBUG_IF(true) {
+            if (glm::any(glm::isnan(m_Direction))) {
+                LOG_WARNING("Ray Direction was set to the zero-vector, expect unknown side effects and/or crashes.");
+            }
+        }
+    }
+    const glm::vec3& Origin() const { return m_Origin; }
+    const glm::vec3& Direction() const { return m_Direction; }
+    //Sets the ray origin at parameter.
+    void SetOrigin(const glm::vec3& origin) { m_Origin = origin; }
+    //Normalizes the parameter and sets direction to it.
+    void SetDirection(const glm::vec3& direction) { m_Direction = glm::normalize(direction); }
+private:
+    glm::vec3 m_Origin;
+    glm::vec3 m_Direction;
+};
+
+#endif // Ray_h__

include/Engine/Core/Util/IfDebug.h

@@ -0,0 +1,12 @@
+// Example:
+// DEBUG_IF(condition) {
+//    // This code is executed only in debug mode and if condition is true.
+// }
+// NOTE: condition statement is not executed at all in release mode.
+#ifndef DEBUG_IF
+#ifndef DEBUG
+#define DEBUG_IF(c) if(c)
+#else
+#define DEBUG_IF(c) if(false)
+#endif
+#endif

include/Engine/Editor/EditorSystem.h

@@ -1,5 +1,6 @@
 #include <imgui/imgui.h>
 #include <glm/gtx/common.hpp>
+#include <boost/filesystem/path.hpp>
 #include "../Core/System.h"
 #include "../Core/EMousePress.h"
 #include "../Core/EMouseRelease.h"
@@ -8,6 +9,7 @@
 #include "../Input/EInputCommand.h"
 #include "../Rendering/IRenderer.h"
 #include "../Rendering/EPicking.h"
+#include "../Core/EFileDropped.h"
 #include "../Rendering/RenderQueueFactory.h"
 
 class EditorSystem : public ImpureSystem
@@ -41,8 +43,11 @@ private:
 
     EntityID m_Widget = 0;
     EntityID m_WidgetX = 0;
+    EntityID m_WidgetPlaneX = 0;
     EntityID m_WidgetY = 0;
+    EntityID m_WidgetPlaneY = 0;
     EntityID m_WidgetZ = 0;
+    EntityID m_WidgetPlaneZ = 0;
     EntityID m_WidgetOrigin = 0;
     glm::vec3 m_WidgetCurrentAxis;
     float m_WidgetPickingDepth = 0.f;
@@ -50,6 +55,7 @@ private:
     EntityID m_Selection = 0;
     EntityID m_LastSelection = 0;
     glm::vec3 m_Position;
+    std::string m_LastDroppedFile;
 
     EventRelay<EditorSystem, Events::InputCommand> m_EInputCommand;
     bool OnInputCommand(const Events::InputCommand& e);
@@ -61,6 +67,8 @@ private:
     bool OnMouseMove(const Events::MouseMove& e);
     EventRelay<EditorSystem, Events::Picking> m_EPicking;
     bool OnPicking(const Events::Picking& e);
+    EventRelay<EditorSystem, Events::FileDropped> m_EFileDropped;
+    bool OnFileDropped(const Events::FileDropped& e);
 
     void updateWidget();
     void setWidgetMode(WidgetMode newMode);