diff --git a/xo-imgui/example/ex4a/VulkanApp.cpp b/xo-imgui/example/ex4a/VulkanApp.cpp
index bffe57cc..dcabcef7 100644
--- a/xo-imgui/example/ex4a/VulkanApp.cpp
+++ b/xo-imgui/example/ex4a/VulkanApp.cpp
@@ -2,13 +2,48 @@
 
 #include "VulkanApp.hpp"
 
-void MinimalImGuiVulkan::run()
-{
-    this->init_window();
+void
+MinimalImGuiVulkan::run() {
+    this->init_sdl_window();
     this->init_vulkan();
     this->init_imgui();
     this->main_loop();
     this->cleanup();
 }
 
+void
+MinimalImGuiVulkan::init_sdl_window() {
+    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+        throw std::runtime_error("Failed to initialize SDL!");
+    }
+
+    this->window_ = SDL_CreateWindow(
+        "ImGui Vulkan SDL2 Example",
+        SDL_WINDOWPOS_CENTERED,
+        SDL_WINDOWPOS_CENTERED,
+        1000, 800,
+        SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE
+        );
+
+    if (!window_) {
+        throw std::runtime_error("Failed to create SDL window!");
+    }
+}
+
+void
+MinimalImGuiVulkan::init_vulkan() {
+    createInstance();
+    createSurface();
+    pickPhysicalDevice();
+    createLogicalDevice();
+    this->createSwapchain();
+    this->createImageViews();
+    this->createRenderPass();   // must come before createFrameBuffers
+    this->createFramebuffers();
+    createCommandPool();
+    createCommandBuffers();
+    createSyncObjects();
+    createDescriptorPool();
+}
+
 /* end VulkanApp.cpp */
diff --git a/xo-imgui/example/ex4a/VulkanApp.hpp b/xo-imgui/example/ex4a/VulkanApp.hpp
index 4458b84d..53657a2d 100644
--- a/xo-imgui/example/ex4a/VulkanApp.hpp
+++ b/xo-imgui/example/ex4a/VulkanApp.hpp
@@ -18,38 +18,13 @@ public:
     void run();
 
 private:
-    void init_window() {
-        if (SDL_Init(SDL_INIT_VIDEO) != 0) {
-            throw std::runtime_error("Failed to initialize SDL!");
-        }
+    /* create SDL window for application.
+     * populates @p window_
+     */
+    void init_sdl_window();
 
-        this->window_ = SDL_CreateWindow(
-            "ImGui Vulkan SDL2 Example",
-            SDL_WINDOWPOS_CENTERED,
-            SDL_WINDOWPOS_CENTERED,
-            800, 600,
-            SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE
-        );
-
-        if (!window_) {
-            throw std::runtime_error("Failed to create SDL window!");
-        }
-    }
-
-    void init_vulkan() {
-        createInstance();
-        createSurface();
-        pickPhysicalDevice();
-        createLogicalDevice();
-        this->createSwapchain();
-        this->createImageViews();
-        this->createRenderPass();   // must come before createFrameBuffers
-        this->createFramebuffers();
-        createCommandPool();
-        createCommandBuffers();
-        createSyncObjects();
-        createDescriptorPool();
-    }
+    /* setup vulkan state. swapchain, command buffers etc */
+    void init_vulkan();
 
     void createInstance() {
         VkApplicationInfo appInfo{};