XCEngine/editor/src/Viewport/SceneViewportOverlayProviders.h

#pragma once

#include "SceneViewportEditorOverlayData.h"

#include <cstddef>
#include <cstdint>
#include <memory>
#include <vector>

namespace XCEngine {
namespace Components {
class Scene;
} // namespace Components

namespace Editor {

class IEditorContext;

struct SceneViewportOverlayBuildContext {
    IEditorContext* editorContext = nullptr;
    const Components::Scene* scene = nullptr;
    const SceneViewportOverlayData* overlay = nullptr;
    uint32_t viewportWidth = 0u;
    uint32_t viewportHeight = 0u;
    const std::vector<uint64_t>* selectedObjectIds = nullptr;
    const SceneViewportTransformGizmoOverlayState* transformGizmoOverlayState = nullptr;

    bool IsValid() const {
        return editorContext != nullptr &&
            scene != nullptr &&
            overlay != nullptr &&
            overlay->valid &&
            viewportWidth > 0u &&
            viewportHeight > 0u &&
            selectedObjectIds != nullptr;
    }
};

class ISceneViewportOverlayProvider {
public:
    virtual ~ISceneViewportOverlayProvider() = default;

    virtual const char* GetName() const = 0;
    virtual void AppendOverlay(
        const SceneViewportOverlayBuildContext& context,
        SceneViewportOverlayFrameData& frameData) const = 0;
};

class SceneViewportOverlayProviderRegistry {
public:
    void AddProvider(std::unique_ptr<ISceneViewportOverlayProvider> provider);
    size_t GetProviderCount() const;
    const ISceneViewportOverlayProvider* GetProvider(size_t index) const;
    void AppendOverlay(
        const SceneViewportOverlayBuildContext& context,
        SceneViewportOverlayFrameData& frameData) const;

private:
    std::vector<std::unique_ptr<ISceneViewportOverlayProvider>> m_providers = {};
};

std::unique_ptr<ISceneViewportOverlayProvider> CreateSceneViewportCameraOverlayProvider();
std::unique_ptr<ISceneViewportOverlayProvider> CreateSceneViewportLightOverlayProvider();
std::unique_ptr<ISceneViewportOverlayProvider> CreateSceneViewportTransformGizmoOverlayProvider();
SceneViewportOverlayProviderRegistry BuildDefaultSceneViewportOverlayProviderRegistry();

} // namespace Editor
} // namespace XCEngine