From dce67620b95a9555c7db950196b22f1bb88a307b Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Wed, 19 Aug 2026 20:33:30 +0200
Subject: feat: vulkan is going to be the end of me bro

---
 src/core/application.cpp | 115 ++++++++++++++++++++++++++++++++++-------------
 1 file changed, 83 insertions(+), 32 deletions(-)

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

diff --git a/src/core/application.cpp b/src/core/application.cpp
index fa5fd6e..0f07979 100644
--- a/src/core/application.cpp
+++ b/src/core/application.cpp
@@ -8,10 +8,14 @@
 #include "states/world_builder_state.h"
 
 #include <GLFW/glfw3.h>
+#include <imgui.h>
 #include <ImGuizmo.h>
 
+#include "platform/vulkan/vulkan_renderer.h"
+
 #ifdef __APPLE__
 #include "platform/metal/metal_context.h"
+#include "platform/vulkan/vulkan_context.h"
 #endif
 
 namespace Donut
@@ -23,8 +27,19 @@ namespace Donut
     {
         s_instance = this;
 
+        Logger::init();
+        SettingsManager::initialize();
+        {
+            const auto& settings = SettingsManager::get_settings_const();
+            RendererAPI::set_api(settings.graphics.render_api == "Vulkan"
+                                ? RendererAPI::API::Vulkan : RendererAPI::API::OpenGL);
+        }
+
+        if (RendererAPI::get_api() == RendererAPI::API::Vulkan)
+            vulkan_prepare_glfw();
+
         m_window = create_scope<Window>(name, width, height);
-        m_window->set_event_callback([this](Event& event) 
+        m_window->set_event_callback([this](Event& event)
         {
             on_event(event);
         });
@@ -42,16 +57,36 @@ namespace Donut
     {
         while (m_running)
         {
-            if (!m_minimized)
+            if (m_vulkan_renderer)
             {
-                on_update();
-                on_render();
+                glfwPollEvents();
+                if (!m_minimized)
+                    m_vulkan_renderer->draw_frame(glm::vec4(0.05f, 0.06f, 0.10f, 1.0f),
+                                                [this] { build_vulkan_ui(); });
+            }
+            else
+            {
+                if (!m_minimized)
+                {
+                    on_update();
+                    on_render();
+                }
+                m_window->on_update();
             }
-
-            m_window->on_update();
         }
     }
 
+    void Application::build_vulkan_ui()
+    {
+        ImGui::Begin("Donut - Vulkan backend");
+        ImGui::Text("Geodesic black hole through Vulkan (MoltenVK).");
+        ImGui::Text("%.1f FPS", ImGui::GetIO().Framerate);
+        ImGui::Separator();
+        ImGui::TextWrapped("Drag to orbit, scroll to zoom. HDRI starfield is live; "
+                           "next is porting the simulation UI to Vulkan.");
+        ImGui::End();
+    }
+
     void Application::close()
     {
         m_running = false;
@@ -73,15 +108,24 @@ namespace Donut
                 m_minimized = true;
             else
                 m_minimized = false;
-            
-            Renderer::on_window_resize(e.get_width(), e.get_height());
-            m_engine->set_window_dimensions(e.get_width(), e.get_height());
+
+            if (m_vulkan_renderer)
+            {
+                m_vulkan_renderer->on_resize(e.get_width(), e.get_height());
+            }
+            else
+            {
+                Renderer::on_window_resize(e.get_width(), e.get_height());
+                if (m_engine) m_engine->set_window_dimensions(e.get_width(), e.get_height());
+            }
             event.handled = true;
             return true;
         });
         
-        dispatcher.dispatch<KeyPressedEvent>([this, &event](KeyPressedEvent& e) 
+        dispatcher.dispatch<KeyPressedEvent>([this, &event](KeyPressedEvent& e)
         {
+            if (!m_state_manager)
+                return true;
             if (e.get_key_code() == GLFW_KEY_1)
             {
                 m_state_manager->switch_to_state("Config");
@@ -103,34 +147,34 @@ namespace Donut
             
             return true;
         });
-        
-        m_state_manager->on_event(event);
+
+        if (m_state_manager)
+            m_state_manager->on_event(event);
     }
 
     void Application::on_init()
     {
-        Logger::init();
+        if (RendererAPI::get_api() == RendererAPI::API::Vulkan)
+        {
+            int w = 0, h = 0;
+            glfwGetFramebufferSize((GLFWwindow*)m_window->get_native_window(), &w, &h);
+            m_vulkan_renderer = create_scope<VulkanRenderer>();
+            if (!m_vulkan_renderer->init(m_window->get_native_window(), w, h))
+                DONUT_ERROR("Vulkan renderer initialization failed");
+            else
+                m_vulkan_renderer->init_im_gui();
+            return;
+        }
 
-#ifdef __APPLE__
-        metal_probe();
-        metal_compute_self_test();
-#endif
-        
-        SettingsManager::initialize();
-        
-        const auto& settings = SettingsManager::get_settings_const();
-        RendererAPI::API api = (settings.graphics.render_api == "Vulkan") ? RendererAPI::API::Vulkan : RendererAPI::API::OpenGL;
-        RendererAPI::set_api(api);
-        
         Renderer::init();
         m_window->init_im_gui();
-        
+
         Renderer::on_window_resize(1280, 720);
         RenderCommand::set_face_culling(false);
 
         m_engine = create_scope<Engine>();
         m_engine->set_window_dimensions(1280, 720);
-        
+
         m_state_manager = create_scope<StateManager>();
         m_state_manager->register_state("Config",       create_scope<ConfigState>());
         m_state_manager->register_state("Simulation",   create_scope<SimulationState>());
@@ -138,12 +182,19 @@ namespace Donut
         m_state_manager->switch_to_state("Config");
     }
 
-    void Application::on_shutdown() 
-    { 
-        if (m_state_manager)
-            m_state_manager->shutdown();
-            
-        Renderer::shutdown();
+    void Application::on_shutdown()
+    {
+        if (m_vulkan_renderer)
+        {
+            m_vulkan_renderer->shutdown();
+            m_vulkan_renderer.reset();
+        }
+        else
+        {
+            if (m_state_manager)
+                m_state_manager->shutdown();
+            Renderer::shutdown();
+        }
         SettingsManager::shutdown();
         Logger::shutdown();
     }
-- 
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