C_view.hpp

/*
 * Copyright 2025 Guillaume Guillet
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef _FGE_GRAPHIC_C_VIEW_HPP_INCLUDED
#define _FGE_GRAPHIC_C_VIEW_HPP_INCLUDED
 
/*
 * Original from : https://github.com/SFML/SFML
 * Copyright (C) 2007-2022 Laurent Gomila
 *
 * Altered/Modified by Guillaume Guillet
 */
 
#include "FastEngine/fge_extern.hpp"
#include "FastEngine/C_rect.hpp"
#include "FastEngine/C_vector.hpp"
#include "FastEngine/vulkan/C_viewport.hpp"
#include <memory>
 
namespace fge
{
 
class ObjectData;
class RenderTarget;
 
using ObjectDataWeak = std::weak_ptr<fge::ObjectData>;

class FGE_API View
{
public:
    View();
    explicit View(fge::vulkan::Viewport const& viewport);
    View(Vector2f const& center, Vector2f const& size);
 
    void setCenter(Vector2f const& center);
    Vector2f const& getCenter() const;

    void setSize(Vector2f const& size);
    Vector2f const& getSize() const;
 
    void setRotation(float angleDeg);
    float getRotation() const;

    void setFactorViewport(fge::RectFloat const& factorViewport);
    fge::RectFloat const& getFactorViewport() const;

    void reset(fge::vulkan::Viewport const& viewport);
    void move(Vector2f const& offset);
    void rotate(float angle);
    void zoom(float factor);
    void resizeFixCenter(fge::Vector2f const& newSize);

    [[nodiscard]] glm::mat4 const& getTransform() const;
    [[nodiscard]] glm::mat4 const& getInverseTransform() const;
    [[nodiscard]] glm::mat4 const& getProjection() const;
    [[nodiscard]] glm::mat4 const& getInverseProjection() const;
 
private:
    fge::Vector2f g_center;
    fge::Vector2f g_size;
    float g_rotation; 
    fge::RectFloat g_factorViewport;
 
    mutable glm::mat4 g_transform;
    mutable glm::mat4 g_projection;
    mutable glm::mat4 g_inverseTransform;
    mutable glm::mat4 g_inverseProjection;
    mutable bool g_transformUpdated;
    mutable bool g_projectionUpdated;
    mutable bool g_invTransformUpdated;
    mutable bool g_invProjectionUpdated;
};
 
class FGE_API OwnView
{
public:
    OwnView() = default;
    OwnView(OwnView const& r);
    OwnView(OwnView&& r) noexcept = default;
    virtual ~OwnView() = default;
 
    OwnView& operator=(OwnView const& r);
    OwnView& operator=(OwnView&& r) noexcept = default;
 
    View& createOwnView();
    void removeOwnView();
    [[nodiscard]] bool hasOwnView() const;
    [[nodiscard]] std::shared_ptr<View> const& getOwnView() const;
    void setOwnView(std::shared_ptr<View> view);
 
    void ownViewOverrideParent(bool enable);
    [[nodiscard]] bool isOwnViewOverridingParent() const;
    void ownViewExplicitlySetDefaultView(bool enable);
    [[nodiscard]] bool isOwnViewUsingExplicitDefaultView() const;
 
    [[nodiscard]] View const& requestView(View const& source, fge::ObjectDataWeak object) const;
    [[nodiscard]] View const& requestView(View const& source, OwnView const& parent) const;
    [[nodiscard]] View const& requestView(View const& source) const;
 
    [[nodiscard]] View const& requestView(fge::RenderTarget const& source, fge::ObjectDataWeak object) const;
    [[nodiscard]] View const& requestView(fge::RenderTarget const& source, OwnView const& parent) const;
    [[nodiscard]] View const& requestView(fge::RenderTarget const& source) const;
 
private:
    std::shared_ptr<View> g_ownView{nullptr};
    bool g_overrideParents{false};
    bool g_explicitDefaultView{false};
};
 
} // namespace fge
 
 
#endif //_FGE_GRAPHIC_C_VIEW_HPP_INCLUDED