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#include "application.h"
#include "rendering/render_api.h" // RendererAPI
#include "settings_manager.h"
#include "platform/opengl/opengl_device.h"
#include "platform/vulkan/vulkan_device.h"
#include <GLFW/glfw3.h>
#include <imgui.h>
#include <glm/glm.hpp>
#include <algorithm>
namespace Donut
{
Application* Application::s_instance = nullptr;
// Scroll is delivered through a GLFW callback; accumulate it here and drain it
// once per frame in update_input (chaining ImGui's own scroll handler).
static double g_scroll_accum = 0.0;
static GLFWscrollfun g_prev_scroll = nullptr;
static void donut_scroll_callback(GLFWwindow* w, double x, double y)
{
if (g_prev_scroll) g_prev_scroll(w, x, y);
g_scroll_accum += y;
}
Application::Application(const std::string& name, int width, int height)
{
s_instance = this;
// Select the render API before the window is created: the window is built
// differently for Vulkan (GLFW_NO_API) than for OpenGL.
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)
RHI::vulkan_prepare_glfw(); // must precede glfwInit() inside the Window ctor
m_window = create_scope<Window>(name, width, height);
m_window->set_event_callback([this](Event& event) { on_event(event); });
on_init();
}
Application::~Application()
{
on_shutdown();
s_instance = nullptr;
}
auto Application::on_init() -> void
{
int w = 0, h = 0;
glfwGetFramebufferSize((GLFWwindow*)m_window->get_native_window(), &w, &h);
if (RendererAPI::get_api() == RendererAPI::API::Vulkan)
m_device = RHI::create_vulkan_device();
else
m_device = RHI::create_opengl_device();
RHI::NativeWindow native{ m_window->get_native_window(), w, h };
if (!m_device->init(native))
{
DONUT_ERROR("RHI device initialization failed");
return;
}
m_scene = create_scope<Scene>();
m_render_path = create_scope<RenderPath>();
m_render_path->init(*m_device, m_scene->hdri_path);
m_ui = create_scope<UILayer>();
m_device->init_imgui();
// Load the UI font into the device-created ImGui context (backend-agnostic;
// the backend rebuilds the atlas on the next frame).
ImGuiIO& io = ImGui::GetIO();
if (!io.Fonts->AddFontFromFileTTF("assets/fonts/inter/static/Inter_18pt-Regular.ttf", 16.0f))
io.Fonts->AddFontDefault();
g_prev_scroll = glfwSetScrollCallback((GLFWwindow*)m_window->get_native_window(), donut_scroll_callback);
m_start_time = glfwGetTime();
DONUT_INFO("Application ready on {} backend", m_device->device_name());
}
auto Application::run() -> void
{
while (m_running)
{
glfwPollEvents();
if (!m_minimized && m_device)
render_frame();
}
}
auto Application::render_frame() -> void
{
RHI::CommandList* cmd = m_device->begin_frame(glm::vec4(0.05f, 0.06f, 0.10f, 1.0f));
if (!cmd) return; // frame skipped (e.g. swapchain recreation)
m_device->imgui_new_frame();
View view = m_ui->draw(UIContext{ *m_scene, m_device->device_name() });
update_input(view);
m_render_path->sync_hdri(m_scene->hdri_path);
int w = 0, h = 0;
glfwGetFramebufferSize((GLFWwindow*)m_window->get_native_window(), &w, &h);
float time = (float)(glfwGetTime() - m_start_time);
m_render_path->render(*cmd, *m_scene, view, w, h, m_user_moving, time);
m_device->end_frame();
}
auto Application::update_input(View view) -> void
{
GLFWwindow* window = (GLFWwindow*)m_window->get_native_window();
bool over_ui = ImGui::GetCurrentContext() && ImGui::GetIO().WantCaptureMouse;
double now = glfwGetTime();
float dt = m_last_frame_time > 0.0 ? (float)(now - m_last_frame_time) : 0.0f;
m_last_frame_time = now;
double mx = 0, my = 0;
glfwGetCursorPos(window, &mx, &my);
bool left_down = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS;
// Tabs without a live viewport (Setup / Export) have no camera to drive.
if (view == View::None)
{
m_left_was_down = left_down; // keep the drag-edge state coherent
g_scroll_accum = 0.0; // discard scroll over inert tabs
m_user_moving = false;
return;
}
const bool scene_view = view == View::Scene;
if (!scene_view && m_scene->sim_camera.get_camera_mode() == CameraMode::FPS)
{
Camera& cam = m_scene->sim_camera;
if (left_down && !m_left_was_down) { m_fps_last_x = mx; m_fps_last_y = my; }
if (left_down && !over_ui)
cam.on_mouse_move(float(mx - m_fps_last_x), float(m_fps_last_y - my));
m_fps_last_x = mx; m_fps_last_y = my;
m_left_was_down = left_down;
bool over_kb = ImGui::GetCurrentContext() && ImGui::GetIO().WantCaptureKeyboard;
bool moved = false;
if (!over_kb && dt > 0.0f)
{
float mdt = dt * (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS ? 4.0f : 1.0f);
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) { cam.move_forward(mdt); moved = true; }
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) { cam.move_backward(mdt); moved = true; }
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) { cam.move_left(mdt); moved = true; }
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) { cam.move_right(mdt); moved = true; }
if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS) { cam.move_up(mdt); moved = true; }
if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS) { cam.move_down(mdt); moved = true; }
}
g_scroll_accum = 0.0;
m_user_moving = moved || (left_down && !over_ui);
}
else
{
Camera& cam = scene_view ? m_scene->scene_camera : m_scene->sim_camera;
if (left_down && !m_left_was_down && !over_ui)
cam.process_orbital_mouse_button(GLFW_MOUSE_BUTTON_LEFT, GLFW_PRESS, 0);
else if (!left_down && m_left_was_down)
cam.process_orbital_mouse_button(GLFW_MOUSE_BUTTON_LEFT, GLFW_RELEASE, 0);
m_left_was_down = left_down;
cam.process_orbital_mouse_move(mx, my);
double scroll = g_scroll_accum; g_scroll_accum = 0.0;
if (scroll != 0.0 && !over_ui)
cam.process_orbital_scroll(0.0, scroll);
m_user_moving = cam.is_dragging() || cam.is_panning();
}
}
auto Application::close() -> void
{
m_running = false;
}
auto Application::on_event(Event& event) -> void
{
EventDispatcher dispatcher(event);
dispatcher.dispatch<WindowCloseEvent>([this, &event](WindowCloseEvent& e)
{
m_running = false;
event.handled = true;
return true;
});
dispatcher.dispatch<WindowResizeEvent>([this, &event](WindowResizeEvent& e)
{
m_minimized = (e.get_width() == 0 || e.get_height() == 0);
if (m_device) m_device->resize(e.get_width(), e.get_height());
event.handled = true;
return true;
});
}
auto Application::on_shutdown() -> void
{
if (m_device)
{
m_device->wait_idle();
if (m_render_path) m_render_path->shutdown();
m_render_path.reset();
m_ui.reset();
m_scene.reset();
m_device->shutdown();
m_device.reset();
}
SettingsManager::shutdown();
Logger::shutdown();
}
}
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