a window

src/AppGLFW.cpp

@@ -0,0 +1,138 @@
+#include "AppGLFW.hpp"
+
+#include "portable-file-dialogs.h"
+
+ui::AppGLFW::AppGLFW()
+{
+    glfwSetErrorCallback(glfw_error_callback);
+    if (!glfwInit())
+    {
+        return;
+    }
+
+    // Decide GL+GLSL versions
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    // GL ES 2.0 + GLSL 100
+    const char* glsl_version = "#version 100";
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+#elif defined(__APPLE__)
+    // GL 3.2 + GLSL 150
+    const char* glsl_version = "#version 150";
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);  // Required on Mac
+#else
+    // GL 3.0 + GLSL 130
+#ifdef __linux__
+    const char* glsl_version = "#version 130";
+#else
+    const char* glsl_version = reinterpret_cast<const char*>("#version 130");
+#endif
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    // glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+
+    // only glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // 3.0+ only
+#endif
+
+    // int count;
+    // GLFWmonitor** monitors = glfwGetMonitors(&count); // at [0] is always the
+    // main monitor GLFWmonitor* monitor = monitors[1];
+    GLFWmonitor* monitor = glfwGetPrimaryMonitor();
+    int xpos, ypos, width, height;
+    glfwGetMonitorWorkarea(monitor, &xpos, &ypos, &width, &height);
+
+    // lg::Logger::Info("screen width " + std::to_string(width) +
+    //                  " screen heigth " + std::to_string(height));
+
+    // Create window with graphics context
+    window = glfwCreateWindow(1200, 800, "pixelarium", nullptr, nullptr);
+    if (window == nullptr)
+    {
+        // lg::Logger::Error("no window");
+        return;
+    }
+
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1);  // Enable vsync
+
+    // Setup Dear ImGui context
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO();
+    (void)io;
+    io.ConfigFlags |=
+        ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
+    io.ConfigFlags |=
+        ImGuiConfigFlags_NavEnableGamepad;  // Enable Gamepad Controls
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;  // Enable Docking
+    io.ConfigFlags |=
+        ImGuiConfigFlags_ViewportsEnable;  // Enable Multi-Viewport / Platform
+                                           // Windows
+    // io.ConfigViewportsNoAutoMerge = true;
+    // io.ConfigViewportsNoTaskBarIcon = true;
+
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+#ifdef __linux__
+    dejavu_serif = io.Fonts->AddFontFromFileTTF(
+        "/usr/share/fonts/dejavu-serif-fonts/DejaVuSerif.ttf", 26.0);
+    IM_ASSERT(dejavu_serif != nullptr);
+#endif
+    ImGuiStyle& style = ImGui::GetStyle();
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+    {
+        style.WindowRounding = 0.0f;
+        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
+    }
+
+    // Setup Platform/Renderer backends
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
+    ImGui_ImplOpenGL3_Init(glsl_version);
+}
+
+int ui::AppGLFW::Run()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    (void)io;
+    while (!glfwWindowShouldClose(this->window))
+    {
+        glfwPollEvents();
+
+        // Start the Dear ImGui frame
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+        // ImGui::DockSpaceOverViewport(ImGui::GetMainViewport());
+
+        // Rendering
+        ImGui::Render();
+        int display_w, display_h;
+        glfwGetFramebufferSize(this->window, &display_w, &display_h);
+        glViewport(0, 0, display_w, display_h);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            GLFWwindow* backup_current_context = glfwGetCurrentContext();
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+            glfwMakeContextCurrent(backup_current_context);
+        }
+
+        glfwSwapBuffers(this->window);
+    }
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
+
+    glfwDestroyWindow(this->window);
+    glfwTerminate();
+
+    return 0;
+}

src/AppGLFW.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <GLFW/glfw3.h>
+#include <cstdio>
+
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+
+namespace ui
+{
+enum LogLevelSelection
+{
+    Debug = 0,
+    Info = 1,
+    Warning = 2,
+    Error = 3
+};
+
+class AppGLFW
+{
+   public:
+    AppGLFW();
+    int Run();
+
+   private:
+    LogLevelSelection log_level_ = static_cast<LogLevelSelection>(0);
+    GLFWwindow* window = nullptr;
+    ImGuiWindowFlags window_flags = 0;
+};
+
+static void glfw_error_callback(int error, const char* description)
+{
+    fprintf(stderr, "GLFW Error %d: %s\n", error, description);
+}
+}  // namespace ui

src/main.cpp

@@ -1,7 +1,11 @@
 #include <iostream>
 
+#include "AppGLFW.hpp"
+
 int main(int argc, char** argv)
 {
     std::cout << "ok\n";
-    return 0;
+    auto app = ui::AppGLFW();
+
+    return app.Run();
 }