1 files changed, 341 insertions, 0 deletions
diff --git a/src/core/window.cpp b/src/core/window.cpp
new file mode 100644
index 0000000..047ef0d
--- /dev/null
+++ b/src/core/window.cpp
@@ -0,0 +1,341 @@
+#include <glad/glad.h>
+#include "window.h"
+#include "theme_manager.h"
+#include "rendering/renderer.h"   // RendererAPI::get_api()
+
+#include <cstdint>
+
+#include <imgui.h>
+#include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
+
+namespace Donut
+{
+    static bool     s_glfw_initialized = false;
+    static uint32_t s_glfw_window_count = 0;
+
+    Window::Window(const std::string& title, int width, int height)
+        : m_title(title), m_width(width),
+          m_height(height), m_is_closed(false)
+    {
+        init();
+    }
+
+    Window::~Window()
+    {
+        shutdown();
+    }
+
+    auto Window::init() -> void
+    {
+        DONUT_INFO("Initializing window: ", m_title, " (", m_width, "x", m_height, ")");
+
+        if (!s_glfw_initialized)
+        {
+            int success = glfwInit();
+            if (!success)
+            {
+                DONUT_ERROR("Could not initialize GLFW!");
+                return;
+            }
+
+            s_glfw_initialized = true;
+            DONUT_INFO("GLFW initialized successfully");
+        }
+
+        if (RendererAPI::get_api() == RendererAPI::API::Vulkan)
+        {
+            // Vulkan manages presentation itself; GLFW must not create a GL context.
+            glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+        }
+        else
+        {
+#ifdef __APPLE__
+            // macOS only exposes OpenGL up to 4.1 Core Profile, and requires a
+            // forward-compatible core-profile context for any modern (>= 3.3)
+            // shader to compile. Without these hints GLFW hands back a legacy
+            // 2.1 context and every GLSL shader in the project fails to build.
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
+            glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+            glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
+#endif
+        }
+
+        m_window = glfwCreateWindow(m_width, m_height, m_title.c_str(), nullptr, nullptr);
+        if (!m_window)
+        {
+            DONUT_ERROR("Could not create GLFW window!");
+            glfwTerminate();
+            return;
+        }
+
+        DONUT_INFO("GLFW window created successfully");
+
+        if (RendererAPI::get_api() != RendererAPI::API::Vulkan)
+            glfwMakeContextCurrent(m_window);
+        glfwSetWindowUserPointer(m_window, this);
+
+        glfwSetErrorCallback(glfw_error_callback);
+        glfwSetWindowCloseCallback(m_window, glfw_window_close_callback);
+        glfwSetWindowSizeCallback(m_window,  glfw_window_size_callback);
+        glfwSetWindowFocusCallback(m_window, glfw_window_focus_callback);
+        glfwSetWindowPosCallback(m_window,   glfw_window_pos_callback);
+        glfwSetKeyCallback(m_window,         glfw_key_callback);
+        glfwSetCharCallback(m_window,        glfw_char_callback);
+        glfwSetMouseButtonCallback(m_window, glfw_mouse_button_callback);
+        glfwSetScrollCallback(m_window,      glfw_mouse_scroll_callback);
+        glfwSetCursorPosCallback(m_window,   glfw_cursor_pos_callback);
+
+        s_glfw_window_count++;
+    }
+
+    auto Window::shutdown() -> void
+    {
+        DONUT_INFO("Shutting down window: ", m_title);
+
+        shutdown_im_gui();
+
+        glfwDestroyWindow(m_window);
+        s_glfw_window_count--;
+
+        if (s_glfw_window_count == 0)
+        {
+            glfwTerminate();
+            s_glfw_initialized = false;
+            DONUT_INFO("GLFW terminated (no more windows)");
+        }
+    }
+
+    auto Window::on_update() const -> void
+    {
+        glfwPollEvents();
+        if (RendererAPI::get_api() != RendererAPI::API::Vulkan)
+            glfwSwapBuffers(m_window); // Vulkan presents via the swapchain instead
+    }
+
+    auto Window::should_close() const -> bool
+    {
+        return glfwWindowShouldClose(m_window) || m_is_closed;
+    }
+
+    auto Window::set_cursor_locked(bool locked) -> void
+    {
+        m_cursor_locked = locked;
+        glfwSetInputMode(m_window, GLFW_CURSOR, locked ?
+                         GLFW_CURSOR_DISABLED : GLFW_CURSOR_NORMAL);
+    }
+
+    auto Window::set_cursor_visible(bool visible) -> void
+    {
+        m_cursor_visible = visible;
+        glfwSetInputMode(m_window, GLFW_CURSOR, visible ?
+                         GLFW_CURSOR_NORMAL : GLFW_CURSOR_HIDDEN);
+    }
+
+    auto Window::init_im_gui() -> void
+    {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        ImGuiIO& io = ImGui::GetIO();
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+        io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+#ifndef __APPLE__
+        // Multi-viewport (dragging ImGui panels out as separate OS windows)
+        // relies on a populated platform-monitor list and is unreliable on
+        // macOS, where it intermittently asserts (Monitors.Size > 0) and
+        // aborts. Docking stays enabled; panels just remain inside the window.
+        io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
+#endif
+
+        setup_im_gui_fonts();
+        ThemeManager::set_theme(Theme::Dark);
+
+        ImGuiStyle& style = ImGui::GetStyle();
+        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            style.WindowRounding = 0.0f;
+            style.Colors[ImGuiCol_WindowBg].w = 1.0f;
+        }
+
+        ImGui_ImplGlfw_InitForOpenGL(m_window, true);
+#ifdef __APPLE__
+        // macOS uses a core-profile context, which rejects the legacy
+        // "#version 130" GLSL the ImGui backend defaults to. 150 is the
+        // minimum core-profile GLSL that macOS's OpenGL 4.1 accepts.
+        ImGui_ImplOpenGL3_Init("#version 150");
+#else
+        ImGui_ImplOpenGL3_Init("#version 130");
+#endif
+
+        DONUT_INFO("ImGUI initialized successfully");
+    }
+
+    auto Window::setup_im_gui_fonts() -> void
+    {
+        ImGuiIO& io = ImGui::GetIO();
+        io.Fonts->Clear();
+
+        m_main_font = io.Fonts->AddFontFromFileTTF("assets/fonts/inter/static/Inter_18pt-Regular.ttf", 16.0f);
+        if (!m_main_font)
+        {
+            DONUT_WARN("Failed to load Inter font, falling back to default");
+            m_main_font = io.Fonts->AddFontDefault();
+        }
+        else
+            DONUT_INFO("Successfully loaded Inter font");
+
+        m_large_font = io.Fonts->AddFontFromFileTTF("assets/fonts/inter/static/Inter_18pt-Bold.ttf", 20.0f);
+        if (!m_large_font)
+            m_large_font = m_main_font;
+
+        m_small_font = io.Fonts->AddFontFromFileTTF("assets/fonts/inter/static/Inter_18pt-Light.ttf", 12.0f);
+        if (!m_small_font)
+            m_small_font = m_main_font;
+
+        io.FontDefault = m_main_font;
+        DONUT_INFO("ImGUI fonts loaded successfully");
+    }
+
+    auto Window::shutdown_im_gui() -> void
+    {
+        ImGui_ImplOpenGL3_Shutdown();
+        ImGui_ImplGlfw_Shutdown();
+        ImGui::DestroyContext();
+
+        DONUT_INFO("ImGUI shutdown");
+    }
+
+    auto Window::begin_im_gui_frame() -> void
+    {
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+    }
+
+    auto Window::end_im_gui_frame() -> void
+    {
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        ImGuiIO& io = ImGui::GetIO();
+        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            GLFWwindow* backup_current_context = glfwGetCurrentContext();
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+            glfwMakeContextCurrent(backup_current_context);
+        }
+    }
+
+    auto Window::glfw_error_callback(int error, const char* description) -> void
+    {
+        DONUT_ERROR("GLFW Error ({}): {}", error, description ? description : "");
+    }
+
+    auto Window::glfw_window_close_callback(GLFWwindow* window) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        WindowCloseEvent event;
+        win->m_event_handler.on_event(event);
+    }
+
+    auto Window::glfw_window_size_callback(GLFWwindow* window, int width, int height) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        win->m_width = width;
+        win->m_height = height;
+
+        WindowResizeEvent event(width, height);
+        win->m_event_handler.on_event(event);
+    }
+
+    auto Window::glfw_window_focus_callback(GLFWwindow* window, int focused) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+
+        if (focused)
+        {
+            WindowFocusEvent event;
+            win->m_event_handler.on_event(event);
+        }
+        else
+        {
+            WindowLostFocusEvent event;
+            win->m_event_handler.on_event(event);
+        }
+    }
+
+    auto Window::glfw_window_pos_callback(GLFWwindow* window, int xpos, int ypos) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        WindowMovedEvent event(xpos, ypos);
+        win->m_event_handler.on_event(event);
+    }
+
+    auto Window::glfw_key_callback(GLFWwindow* window, int key, int scancode,
+                                   int action, int mods) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+
+        switch (action)
+        {
+            case GLFW_PRESS:
+            {
+                KeyPressedEvent event(key, false);
+                win->m_event_handler.on_event(event);
+            } break;
+            case GLFW_RELEASE:
+            {
+                KeyReleasedEvent event(key);
+                win->m_event_handler.on_event(event);
+            } break;
+            case GLFW_REPEAT:
+            {
+                KeyPressedEvent event(key, true);
+                win->m_event_handler.on_event(event);
+            } break;
+        }
+    }
+
+    auto Window::glfw_char_callback(GLFWwindow* window, unsigned int keycode) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        KeyTypedEvent event(keycode);
+        win->m_event_handler.on_event(event);
+    }
+
+    auto Window::glfw_mouse_button_callback(GLFWwindow* window, int button,
+                                            int action, int mods) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+
+        switch (action)
+        {
+            case GLFW_PRESS:
+            {
+                MouseButtonPressedEvent event(button);
+                win->m_event_handler.on_event(event);
+            } break;
+            case GLFW_RELEASE:
+            {
+                MouseButtonReleasedEvent event(button);
+                win->m_event_handler.on_event(event);
+            } break;
+        }
+    }
+
+    auto Window::glfw_mouse_scroll_callback(GLFWwindow* window, double x_offset, double y_offset) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        MouseScrolledEvent event((float)x_offset, (float)y_offset);
+        win->m_event_handler.on_event(event);
+    }
+
+    auto Window::glfw_cursor_pos_callback(GLFWwindow* window, double x_pos, double y_pos) -> void
+    {
+        Window* win = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        MouseMovedEvent event((float)x_pos, (float)y_pos);
+        win->m_event_handler.on_event(event);
+    }
+}