From 3fd33ecff7472e4d6fc9e6b3905f56982e497ef2 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sun, 23 Aug 2026 17:21:37 +0200
Subject: [feat]: complete RHI api

---
 src/core/application.h | 64 ++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 46 insertions(+), 18 deletions(-)

(limited to 'src/core/application.h')

diff --git a/src/core/application.h b/src/core/application.h
index 4c377f0..4b67c84 100644
--- a/src/core/application.h
+++ b/src/core/application.h
@@ -1,16 +1,25 @@
 #pragma once
 
-#include "state_manager.h"
 #include "memory.h"
 #include "window.h"
 #include "event.h"
 #include "log.h"
+#include "camera.h"
 
-#include "engine/engine.h"
-#include "rendering/renderer_backend.h"
+#include "rendering/rhi.h"
+#include "rendering/scene_renderer.h"
+#include "rendering/black_hole_renderer.h"
+
+#include <string>
+#include <vector>
 
 namespace Donut
 {
+    // The application owns ONE RHI::Device (OpenGL or Vulkan, chosen at startup)
+    // and the two portable renderers written on top of it, plus all the shared
+    // state (cameras, scene objects, disk parameters, HDRI). Because the rendering
+    // lives in the RHI and the shared renderers, the app behaves identically no
+    // matter which backend is active.
     class Application
     {
     public:
@@ -21,33 +30,52 @@ namespace Donut
         auto run() -> void;
         auto close() -> void;
 
-        auto get_window() -> Window&             { return *m_window;        }
-        auto get_state_manager() -> StateManager& { return *m_state_manager; }
-        auto get_engine() -> Engine&             { return *m_engine;        }
-        static auto get() -> Application&         { return *s_instance;      }
+        auto get_window() -> Window&      { return *m_window;   }
+        static auto get() -> Application&  { return *s_instance; }
 
     private:
         auto on_init() -> void;
         auto on_shutdown() -> void;
-        auto on_update() -> void;
-        auto on_render() -> void;
         auto on_event(Event& event) -> void;
-        auto setup_docking_layout() -> void;
-        auto build_ui() -> void;       // shared ImGui panel, drives the active RendererBackend
-        auto build_scene_ui() -> void; // scene-view (object list) section of the UI
+
+        auto build_ui() -> void;         // shared ImGui panel
+        auto build_scene_ui() -> void;   // scene-view (object list) section
+
+        auto process_input() -> void;    // orbit / free-fly / zoom, was per-backend
+        auto set_free_fly(bool enabled) -> void;
+        auto reset_camera() -> void;
+        auto set_hdri(const std::string& path) -> void;
+
+        auto render_frame() -> void;
 
     private:
-        Scope<StateManager> m_state_manager;
         Scope<Window> m_window;
-        Scope<Engine> m_engine;
-        Scope<RendererBackend> m_renderer; // active backend (non-null once a backend runs the app)
+
+        // The unified renderer: one device + the shared renderers on top of it.
+        Scope<RHI::Device>        m_device;
+        Scope<SceneRenderer>      m_scene_renderer;
+        Scope<BlackHoleRenderer>  m_black_hole_renderer;
+        Ref<RHI::Texture>         m_cubemap;          // shared HDRI environment
+
+        Camera m_camera{ 60.0f, 16.0f / 9.0f, 0.1f, 100.0f };        // black-hole view
+        Camera m_scene_camera{ 45.0f, 16.0f / 9.0f, 0.1f, 1000.0f }; // world-builder view
+
+        BlackHoleParams m_bh_params;
+        std::vector<SceneObject> m_scene_objects{ SceneObject{} };
+        int  m_selected_object = 0;
+        bool m_scene_mode = false;
+        std::string m_hdri_path;
+
+        // input tracking (mirrors the old per-backend process_input)
+        bool   m_left_was_down = false;
+        double m_fps_last_x = 0.0, m_fps_last_y = 0.0;
+        double m_last_frame_time = 0.0;
+        double m_start_time = 0.0;
+        bool   m_user_moving = false;
 
         bool m_running;
         bool m_minimized;
 
-        float m_delta_time = 0.0f;
-        float m_last_frame = 0.0f;
-
         static Application* s_instance;
     };
 }
-- 
cgit v1.3