o3de/Gems/Atom/RHI/Code/Source/RHI.Reflect/Scissor.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 <Atom/RHI.Reflect/Scissor.h>
#include <AzCore/Serialization/SerializeContext.h>
#include <AzCore/Math/MathUtils.h>

namespace AZ::RHI
{
    void Scissor::Reflect(AZ::ReflectContext* context)
    {
        if (SerializeContext* serializeContext = azrtti_cast<SerializeContext*>(context))
        {
            serializeContext->Class<Scissor>()
                ->Version(1)
                ->Field("m_minX", &Scissor::m_minX)
                ->Field("m_minY", &Scissor::m_minY)
                ->Field("m_maxX", &Scissor::m_maxX)
                ->Field("m_maxY", &Scissor::m_maxY);
        }
    }

    Scissor::Scissor(
        int32_t minX,
        int32_t minY,
        int32_t maxX,
        int32_t maxY)
        : m_minX(minX)
        , m_minY(minY)
        , m_maxX(maxX)
        , m_maxY(maxY)
    {}

    Scissor Scissor::GetScaled(
        float normalizedMinX,
        float normalizedMinY,
        float normalizedMaxX,
        float normalizedMaxY) const
    {
        Scissor scissor;
        scissor.m_minX = static_cast<int32_t>(Lerp(static_cast<float>(m_minX), static_cast<float>(m_maxX), normalizedMinX));
        scissor.m_maxX = static_cast<int32_t>(Lerp(static_cast<float>(m_minX), static_cast<float>(m_maxX), normalizedMaxX));
        scissor.m_minY = static_cast<int32_t>(Lerp(static_cast<float>(m_minY), static_cast<float>(m_maxY), normalizedMinY));
        scissor.m_maxY = static_cast<int32_t>(Lerp(static_cast<float>(m_minY), static_cast<float>(m_maxY), normalizedMaxY));
        return scissor;
    }

    Scissor Scissor::CreateNull()
    {
        return Scissor{0, 0, -1, -1};
    }

    bool Scissor::IsNull() const
    {
        return ((m_minX > m_maxX) || (m_minY > m_maxY));
    }
}