o3de-multiplayersample/Gem/Code/Source/Components/NetworkSimplePlayerCameraComponent.cpp

/*
 * Copyright (c) Contributors to the Open 3D Engine Project. For complete copyright and license terms please see the LICENSE at the root of this distribution.
 * 
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#include <AzCore/Component/ComponentApplicationBus.h>
#include <Source/Components/NetworkAiComponent.h>
#include <Source/Components/NetworkSimplePlayerCameraComponent.h>
#include <AzCore/Component/TransformBus.h>
#include <AzFramework/Components/CameraBus.h>
#include <Multiplayer/IMultiplayer.h>

namespace MultiplayerSample
{
    AZ_CVAR(AZ::Vector3, cl_cameraOffset, AZ::Vector3(0.0f, -5.0f, 3.0f), nullptr, AZ::ConsoleFunctorFlags::Null, "Offset to use for the player camera");

    NetworkSimplePlayerCameraComponentController::NetworkSimplePlayerCameraComponentController(NetworkSimplePlayerCameraComponent& parent)
        : NetworkSimplePlayerCameraComponentControllerBase(parent)
    {
        ;
    }

    void NetworkSimplePlayerCameraComponentController::OnActivate([[maybe_unused]] Multiplayer::EntityIsMigrating entityIsMigrating)
    {
        // Synchronize aim angles with initial transform
        AZ::Vector3& aimAngles = ModifyAimAngles();
        aimAngles.SetZ(GetEntity()->GetTransform()->GetLocalRotation().GetZ());
        SetSyncAimImmediate(true);

        if (IsAutonomous())
        {
            m_aiEnabled = FindComponent<NetworkAiComponent>()->GetEnabled();
            if (!m_aiEnabled)
            {
                AZ::EntityId activeCameraId;
                Camera::CameraSystemRequestBus::BroadcastResult(activeCameraId, &Camera::CameraSystemRequestBus::Events::GetActiveCamera);
                m_activeCameraEntity = AZ::Interface<AZ::ComponentApplicationRequests>::Get()->FindEntity(activeCameraId);
            }
        }

        AZ::TickBus::Handler::BusConnect();
    }

    void NetworkSimplePlayerCameraComponentController::OnDeactivate([[maybe_unused]] Multiplayer::EntityIsMigrating entityIsMigrating)
    {
        AZ::TickBus::Handler::BusDisconnect();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraYaw() const
    {
        return GetAimAngles().GetZ();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraPitch() const
    {
        return GetAimAngles().GetX();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraRoll() const
    {
        return GetAimAngles().GetY();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraYawPrevious() const
    {
        return GetAimAnglesPrevious().GetZ();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraPitchPrevious() const
    {
        return GetAimAnglesPrevious().GetX();
    }

    float NetworkSimplePlayerCameraComponentController::GetCameraRollPrevious() const
    {
        return GetAimAnglesPrevious().GetY();
    }

    void NetworkSimplePlayerCameraComponentController::OnTick([[maybe_unused]] float deltaTime, [[maybe_unused]] AZ::ScriptTimePoint time)
    {
        if (m_activeCameraEntity != nullptr && m_activeCameraEntity->GetState() == AZ::Entity::State::Active)
        {
            const AZ::Quaternion targetRotation = AZ::Quaternion::CreateRotationZ(GetCameraYaw()) * AZ::Quaternion::CreateRotationX(GetCameraPitch());
            const float blendFactor = Multiplayer::GetMultiplayer()->GetCurrentBlendFactor();
            
            AZ::Quaternion aimRotation = targetRotation;
            if (!GetSyncAimImmediate() && !AZ::IsClose(blendFactor, 1.0f))
            {
                const AZ::Quaternion prevRotation = AZ::Quaternion::CreateRotationZ(GetCameraYawPrevious()) * AZ::Quaternion::CreateRotationX(GetCameraPitchPrevious());
                if (!prevRotation.IsClose(targetRotation))
                {
                    aimRotation = prevRotation.Slerp(targetRotation, blendFactor).GetNormalized();
                }
            }
            const AZ::Vector3 targetTranslation = GetEntity()->GetTransform()->GetWorldTM().GetTranslation();
            const AZ::Vector3 cameraOffset = aimRotation.TransformVector(cl_cameraOffset);
            const AZ::Transform cameraTransform = AZ::Transform::CreateFromQuaternionAndTranslation(aimRotation, targetTranslation + cameraOffset);
            m_activeCameraEntity->GetTransform()->SetWorldTM(cameraTransform);
        }

        if (GetSyncAimImmediate())
        {
            SetSyncAimImmediate(false);
        }
    }

    int NetworkSimplePlayerCameraComponentController::GetTickOrder()
    {
        return AZ::TICK_PRE_RENDER;
    }
}