src/rendering/render_path.h


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#pragma once

#include "rhi.h"
#include "view.h"
#include "scene_renderer.h"
#include "black_hole_renderer.h"
#include "core/memory.h"

#include <string>

namespace Donut
{
    class Scene;

    // Owns the device-side rendering: the two portable renderers, the shared HDRI
    // cubemap, and the per-frame composition (off-screen geodesic pass -> present,
    // or the scene pass), with ImGui drawn on top inside the swapchain pass. The
    // Application hands it a Scene + View each frame; it knows nothing about the UI.
    class RenderPath
    {
    public:
        auto init(RHI::Device& device, const std::string& hdri_path) -> bool;
        auto shutdown() -> void;

        // Rebuilds the environment cubemap if the path changed (device-idle).
        auto sync_hdri(const std::string& hdri_path) -> void;

        // Composes one frame's viewport into the swapchain command list. `moving`
        // drives the black hole's progressive resolution; `time` animates the disk.
        auto render(RHI::CommandList& cmd, Scene& scene, View view,
                    int fb_width, int fb_height, bool moving, float time) -> void;

    private:
        RHI::Device*             m_device = nullptr;
        Scope<SceneRenderer>     m_scene_renderer;
        Scope<BlackHoleRenderer> m_black_hole_renderer;
        Ref<RHI::Texture>        m_cubemap;
        std::string              m_hdri_path;
    };
}