hultonha
052ff90c9d
* preparatory work to allow for more viewport integration tests Signed-off-by: hultonha <hultonha@amazon.co.uk> * minor grammatical fix Signed-off-by: hultonha <hultonha@amazon.co.uk> * fix for missed bus call update Signed-off-by: hultonha <hultonha@amazon.co.uk>
85 lines
3.5 KiB
C++
85 lines
3.5 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#pragma once
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#include <AzCore/Component/Entity.h>
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#include <AzCore/Component/ComponentBus.h>
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#include <AzCore/Component/TransformBus.h>
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#include <AzFramework/Render/GeometryIntersectionStructures.h>
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// required by components implementing BoundsRequestBus to notify the
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// Entity that their bounds has changed (or to access the cached entity bound union)
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#include <AzFramework/Visibility/EntityBoundsUnionBus.h>
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namespace AZ
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{
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class ReflectContext;
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}
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namespace AzFramework
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{
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//! Implemented by components that provide bounds for use with various systems.
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class BoundsRequests
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: public AZ::ComponentBus
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{
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public:
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static void Reflect(AZ::ReflectContext* context);
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//! Returns an axis aligned bounding box in world space.
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//! @note It is preferred to use CalculateEntityWorldBoundsUnion in the general case as
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//! more than one component may be providing a bound. It isn't guaranteed which bound
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//! will be returned by a single call to GetWorldBounds.
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virtual AZ::Aabb GetWorldBounds() = 0;
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//! Returns an axis aligned bounding box in local space.
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//! @note It is preferred to use CalculateEntityLocalBoundsUnion in the general case as
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//! more than one component may be providing a bound. It isn't guaranteed which bound
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//! will be returned by a single call to GetLocalBounds.
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virtual AZ::Aabb GetLocalBounds() = 0;
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protected:
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~BoundsRequests() = default;
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};
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using BoundsRequestBus = AZ::EBus<BoundsRequests>;
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//! Returns a union of all local Aabbs provided by components implementing the BoundsRequestBus.
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//! @note It is preferred to call this function as opposed to GetLocalBounds directly as more than one
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//! component may be implementing this bus on an Entity and so only the first result (Aabb) will be returned.
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inline AZ::Aabb CalculateEntityLocalBoundsUnion(const AZ::Entity* entity)
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{
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AZ::EBusReduceResult<AZ::Aabb, AabbUnionAggregator> aabbResult(AZ::Aabb::CreateNull());
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BoundsRequestBus::EventResult(aabbResult, entity->GetId(), &BoundsRequestBus::Events::GetLocalBounds);
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if (aabbResult.value.IsValid())
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{
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return aabbResult.value;
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}
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return AZ::Aabb::CreateFromMinMax(-AZ::Vector3(0.5f), AZ::Vector3(0.5f));
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}
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//! Returns a union of all world Aabbs provided by components implementing the BoundsRequestBus.
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//! @note It is preferred to call this function as opposed to GetWorldBounds directly as more than one
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//! component may be implementing this bus on an Entity and so only the first result (Aabb) will be returned.
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inline AZ::Aabb CalculateEntityWorldBoundsUnion(const AZ::Entity* entity)
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{
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AZ::EBusReduceResult<AZ::Aabb, AabbUnionAggregator> aabbResult(AZ::Aabb::CreateNull());
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BoundsRequestBus::EventResult(aabbResult, entity->GetId(), &BoundsRequestBus::Events::GetWorldBounds);
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if (aabbResult.value.IsValid())
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{
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return aabbResult.value;
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}
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AZ::TransformInterface* transformInterface = entity->GetTransform();
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const AZ::Vector3 worldTranslation = transformInterface->GetWorldTranslation();
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return AZ::Aabb::CreateCenterHalfExtents(worldTranslation, AZ::Vector3(0.5f));
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}
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} // namespace AzFramework
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