Animation system

Nuake/src/Scene/Systems/AnimationSystem.cpp

@@ -0,0 +1,89 @@
+#include "AnimationSystem.h"
+
+#include "src/Scene/Scene.h"
+#include "src/Scene/Entities/Entity.h"
+#include "src/Scene/Components/SkinnedModelComponent.h"
+
+namespace Nuake
+{
+	AnimationSystem::AnimationSystem(Scene* scene)
+	{
+		m_Scene = scene;
+	}
+
+	bool AnimationSystem::Init()
+	{
+		return true;
+	}
+
+	void AnimationSystem::Update(Timestep ts)
+	{
+		auto view = m_Scene->m_Registry.view<TransformComponent, SkinnedModelComponent>();
+		for (auto e : view)
+		{
+			auto [transformComponent, skinnedComponent] = view.get<TransformComponent, SkinnedModelComponent>(e);
+
+			auto& model = skinnedComponent.ModelResource;
+			if (!model)
+			{
+				continue;
+			}
+
+			Ref<SkeletalAnimation> animation = model->GetCurrentAnimation();
+			float newAnimationTime = animation->GetCurrentTime() + (ts * animation->GetTicksPerSecond());
+			animation->SetCurrentTime(newAnimationTime);
+
+			auto& rootBone = model->GetSkeletonRootNode();
+			UpdateBonePositionTraversal(rootBone, animation, animation->GetCurrentTime());
+		}
+	}
+
+	void AnimationSystem::UpdateBonePositionTraversal(SkeletonNode& bone, Ref<SkeletalAnimation> animation, float time)
+	{
+		const std::string& boneName = bone.Name;
+		
+
+		Entity& boneEntity = m_Scene->GetEntity(boneName);
+		if (boneEntity.GetHandle() != -1)
+		{
+			auto& animationTrack = animation->GetTrack(boneName);
+			auto& transformComponent = boneEntity.GetComponent<TransformComponent>();
+
+			// Get Update transform
+			const Matrix4 newPosition = animationTrack.InterpolatePosition(time);
+			const Matrix4 newRotation = animationTrack.InterpolateRotation(time);
+			const Matrix4 newScale = animationTrack.InterpolateScale(time);
+			const Matrix4 finalTransform = newPosition * newRotation * newScale;
+
+			Vector3 localPosition;
+			Quat localRotation;
+			Vector3 localScale;
+			Decompose(finalTransform, localPosition, localRotation, localScale);
+
+			transformComponent.SetLocalPosition(localPosition);
+			transformComponent.SetLocalRotation(localRotation);
+			transformComponent.SetLocalScale(localScale);
+			transformComponent.SetLocalTransform(finalTransform);
+		}
+
+		for (auto& childBone : bone.Children)
+		{
+			UpdateBonePositionTraversal(childBone, animation, time);
+		}
+	}
+
+	void AnimationSystem::FixedUpdate(Timestep ts)
+	{
+		
+	}
+
+	void AnimationSystem::EditorUpdate()
+	{
+
+	}
+
+	void AnimationSystem::Exit()
+	{
+
+	}
+}