23 files changed, 292 insertions, 117 deletions

diff --git a/engine/xe_engine.cpp b/engine/xe_engine.cpp
index e137d11..0ba7df5 100644
--- a/engine/xe_engine.cpp
+++ b/engine/xe_engine.cpp
@@ -1,17 +1,13 @@
 #include "xe_engine.hpp"
-#include "xe_image.hpp"
-
-#include <chrono> 
-#include <iostream>
-#include <AL/alc.h> 
-#include <AL/alut.h>
 
 namespace xe {
 
-XeEngine::XeEngine(int width, int height, std::string name) : xeWindow{width, height, name}, 
+XeEngine::XeEngine(int width, int height, std::string name) 
+: xeWindow{width, height, name}, 
   xeDevice{xeWindow}, 
   xeRenderer{xeWindow, xeDevice},
-  xeCamera{} {
+  xeCamera{},
+  xeInput{xeWindow} {
   loadDescriptorPool();
   alutInit(0, NULL);
   std::cout << "Audio device: " << alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER) << "\n";
diff --git a/engine/xe_engine.hpp b/engine/xe_engine.hpp
index d86c6a9..422f4c8 100644
--- a/engine/xe_engine.hpp
+++ b/engine/xe_engine.hpp
@@ -1,14 +1,19 @@
 #pragma once
 
-#include "xe_window.hpp"
 #include "xe_device.hpp"
 #include "xe_renderer.hpp"
 #include "xe_camera.hpp"
 #include "xe_descriptors.hpp"
 #include "xe_image.hpp"
+#include "xe_input.hpp"
+#include "xe_sound.hpp"
 
 #include <chrono> 
 #include <string>
+#include <iostream>
+#include <AL/alc.h> 
+#include <AL/alut.h>
+
 namespace xe {
 
 class XeEngine {
@@ -22,7 +27,7 @@ class XeEngine {
     XeEngine(const XeEngine&) = delete;
     XeEngine operator=(const XeEngine&) = delete;
 
-    XeWindow& getWindow() {return xeWindow;}
+    XeInput& getInput() {return xeInput;}
     XeCamera& getCamera() {return xeCamera;}
 
     std::shared_ptr<XeModel> loadModelFromFile(const std::string &filename);
@@ -44,6 +49,7 @@ class XeEngine {
     XeDevice xeDevice;
     XeRenderer xeRenderer;
     XeCamera xeCamera;
+    XeInput xeInput;
 
     std::chrono::_V2::system_clock::time_point currentTime;
     float frameTime;
diff --git a/engine/xe_input.cpp b/engine/xe_input.cpp
new file mode 100644
index 0000000..91b9cab
--- /dev/null
+++ b/engine/xe_input.cpp
@@ -0,0 +1,46 @@
+#include "xe_input.hpp"
+
+#include <GLFW/glfw3.h>
+
+namespace xe {
+
+static XeInput* _instance;
+
+XeInput::XeInput(XeWindow& window) : window{window} {
+  glfwSetKeyCallback(window.getGLFWwindow(), XeInput::key_callback);
+  glfwSetMouseButtonCallback(window.getGLFWwindow(), XeInput::mouse_callback);
+  _instance = this;
+}
+
+bool XeInput::isKeyPressed(int key) {
+  return glfwGetKey(window.getGLFWwindow(), key) == GLFW_PRESS;
+}
+
+bool XeInput::wasKeyPressed(int key) {
+  if(_pressed[key] == true) {
+    _pressed[key] = false;
+    return true;
+  }
+  return false;
+}
+
+bool XeInput::wasKeyReleased(int key) {
+  if(_released[key] == true) {
+    _released[key] = false;
+    return true;
+  }
+  return false;
+}
+
+void XeInput::key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+  if(action == GLFW_PRESS) _instance->_pressed[key] = true;
+  if(action == GLFW_RELEASE) _instance->_released[key] = true;
+}
+
+void XeInput::mouse_callback(GLFWwindow* window, int key, int action, int mods) {
+  if(action == GLFW_PRESS) _instance->_pressed[key] = true;
+  if(action == GLFW_RELEASE) _instance->_released[key] = true;
+}
+
+
+}
\ No newline at end of file
diff --git a/engine/xe_input.hpp b/engine/xe_input.hpp
new file mode 100644
index 0000000..4465b4e
--- /dev/null
+++ b/engine/xe_input.hpp
@@ -0,0 +1,167 @@
+#pragma once
+
+#include "xe_window.hpp"
+
+#include <vector>
+#include <map>
+
+#include <GLFW/glfw3.h>
+
+namespace xe {
+
+class XeInput {
+
+  public:
+
+    bool isKeyPressed(int key);
+    bool wasKeyPressed(int key);
+    bool wasKeyReleased(int key);
+
+  private:
+  
+    XeInput(XeWindow& window);
+    ~XeInput() {};
+
+    void setIsKeyDown(int key, bool isDown);
+
+    std::map<int, bool> _pressed;
+    std::map<int, bool> _released;
+    XeWindow &window;
+    
+    static void key_callback(
+      GLFWwindow* window, int key, int scancode, int action, int mods);
+
+    static void mouse_callback(
+      GLFWwindow* window, int key, int action, int mods);
+
+    friend class XeEngine;
+};
+
+}
+
+#define KEY_SPACE              32
+#define KEY_APOSTROPHE         39  /* ' */
+#define KEY_COMMA              44  /* , */
+#define KEY_MINUS              45  /* - */
+#define KEY_PERIOD             46  /* . */
+#define KEY_SLASH              47  /* / */
+#define KEY_0                  48
+#define KEY_1                  49
+#define KEY_2                  50
+#define KEY_3                  51
+#define KEY_4                  52
+#define KEY_5                  53
+#define KEY_6                  54
+#define KEY_7                  55
+#define KEY_8                  56
+#define KEY_9                  57
+#define KEY_SEMICOLON          59  /* ; */
+#define KEY_EQUAL              61  /* = */
+#define KEY_A                  65
+#define KEY_B                  66
+#define KEY_C                  67
+#define KEY_D                  68
+#define KEY_E                  69
+#define KEY_F                  70
+#define KEY_G                  71
+#define KEY_H                  72
+#define KEY_I                  73
+#define KEY_J                  74
+#define KEY_K                  75
+#define KEY_L                  76
+#define KEY_M                  77
+#define KEY_N                  78
+#define KEY_O                  79
+#define KEY_P                  80
+#define KEY_Q                  81
+#define KEY_R                  82
+#define KEY_S                  83
+#define KEY_T                  84
+#define KEY_U                  85
+#define KEY_V                  86
+#define KEY_W                  87
+#define KEY_X                  88
+#define KEY_Y                  89
+#define KEY_Z                  90
+#define KEY_LEFT_BRACKET       91  /* [ */
+#define KEY_BACKSLASH          92  /* \ */
+#define KEY_RIGHT_BRACKET      93  /* ] */
+#define KEY_GRAVE_ACCENT       96  /* ` */
+#define KEY_WORLD_1            161 /* non-US #1 */
+#define KEY_WORLD_2            162 /* non-US #2 */
+
+/* Function keys */
+#define KEY_ESCAPE             256
+#define KEY_ENTER              257
+#define KEY_TAB                258
+#define KEY_BACKSPACE          259
+#define KEY_INSERT             260
+#define KEY_DELETE             261
+#define KEY_RIGHT              262
+#define KEY_LEFT               263
+#define KEY_DOWN               264
+#define KEY_UP                 265
+#define KEY_PAGE_UP            266
+#define KEY_PAGE_DOWN          267
+#define KEY_HOME               268
+#define KEY_END                269
+#define KEY_CAPS_LOCK          280
+#define KEY_SCROLL_LOCK        281
+#define KEY_NUM_LOCK           282
+#define KEY_PRINT_SCREEN       283
+#define KEY_PAUSE              284
+#define KEY_F1                 290
+#define KEY_F2                 291
+#define KEY_F3                 292
+#define KEY_F4                 293
+#define KEY_F5                 294
+#define KEY_F6                 295
+#define KEY_F7                 296
+#define KEY_F8                 297
+#define KEY_F9                 298
+#define KEY_F10                299
+#define KEY_F11                300
+#define KEY_F12                301
+#define KEY_F13                302
+#define KEY_F14                303
+#define KEY_F15                304
+#define KEY_F16                305
+#define KEY_F17                306
+#define KEY_F18                307
+#define KEY_F19                308
+#define KEY_F20                309
+#define KEY_F21                310
+#define KEY_F22                311
+#define KEY_F23                312
+#define KEY_F24                313
+#define KEY_F25                314
+#define KEY_KP_0               320
+#define KEY_KP_1               321
+#define KEY_KP_2               322
+#define KEY_KP_3               323
+#define KEY_KP_4               324
+#define KEY_KP_5               325
+#define KEY_KP_6               326
+#define KEY_KP_7               327
+#define KEY_KP_8               328
+#define KEY_KP_9               329
+#define KEY_KP_DECIMAL         330
+#define KEY_KP_DIVIDE          331
+#define KEY_KP_MULTIPLY        332
+#define KEY_KP_SUBTRACT        333
+#define KEY_KP_ADD             334
+#define KEY_KP_ENTER           335
+#define KEY_KP_EQUAL           336
+#define KEY_LEFT_SHIFT         340
+#define KEY_LEFT_CONTROL       341
+#define KEY_LEFT_ALT           342
+#define KEY_LEFT_SUPER         343
+#define KEY_RIGHT_SHIFT        344
+#define KEY_RIGHT_CONTROL      345
+#define KEY_RIGHT_ALT          346
+#define KEY_RIGHT_SUPER        347
+#define KEY_MENU               348
+
+#define MOUSE_BUTTON_ONE         0
+#define MOUSE_BUTTON_TWO         1
+#define MOUSE_BUTTON_THREE       2
\ No newline at end of file
diff --git a/engine/xe_pipeline.cpp b/engine/xe_pipeline.cpp
index d06d09b..e9fd4d1 100755
--- a/engine/xe_pipeline.cpp
+++ b/engine/xe_pipeline.cpp
@@ -1,7 +1,5 @@
 #include "xe_pipeline.hpp"
 
-#include "xe_model.hpp"
-
 #include <cstdint>
 #include <fstream>
 #include <stdexcept>
diff --git a/engine/xe_pipeline.hpp b/engine/xe_pipeline.hpp
index 06bcf0f..5e2e1fb 100755
--- a/engine/xe_pipeline.hpp
+++ b/engine/xe_pipeline.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "xe_device.hpp"
+#include "xe_model.hpp"
 
 #include <cstdint>
 #include <string>
diff --git a/engine/xe_render_system.cpp b/engine/xe_render_system.cpp
index 1e638ad..e5954c7 100644
--- a/engine/xe_render_system.cpp
+++ b/engine/xe_render_system.cpp
@@ -1,19 +1,5 @@
 #include "xe_render_system.hpp"
 
-#include <vulkan/vulkan.h>
-#include "xe_device.hpp"
-#include "xe_pipeline.hpp"
-#include "xe_game_object.hpp"
-#include "xe_swap_chain.hpp"
-#include "xe_renderer.hpp"
-#include "xe_descriptors.hpp"
-#include "xe_engine.hpp"
-
-#include <memory>
-#include <stdexcept>
-
-#include <iostream>
-
 namespace xe {
 
 XeRenderSystem::XeRenderSystem(
diff --git a/engine/xe_render_system.hpp b/engine/xe_render_system.hpp
index a8b4145..098727c 100644
--- a/engine/xe_render_system.hpp
+++ b/engine/xe_render_system.hpp
@@ -1,15 +1,17 @@
 #pragma once
 
-#include <vulkan/vulkan.h>
 #include "xe_device.hpp"
 #include "xe_pipeline.hpp"
 #include "xe_game_object.hpp"
-#include "xe_descriptors.hpp"
+#include "xe_swap_chain.hpp"
 #include "xe_renderer.hpp"
+#include "xe_descriptors.hpp"
 #include "xe_engine.hpp"
-#include "xe_image.hpp"
 
+#include <vulkan/vulkan.h>
 #include <memory>
+#include <stdexcept>
+#include <iostream>
 #include <map>
 
 namespace xe {
diff --git a/engine/xe_renderer.cpp b/engine/xe_renderer.cpp
index 1714e46..5d901b0 100644
--- a/engine/xe_renderer.cpp
+++ b/engine/xe_renderer.cpp
@@ -1,17 +1,5 @@
 #include "xe_renderer.hpp"
 
-#include "xe_device.hpp"
-#include "xe_game_object.hpp"
-#include "xe_swap_chain.hpp"
-#include "xe_descriptors.hpp"
-#include "xe_window.hpp"
-#include <memory>
-#include <vulkan/vulkan_core.h>
-
-#include <array>
-#include <cassert>
-#include <stdexcept>
-
 namespace xe {
 
 XeRenderer::XeRenderer(XeWindow& window, XeDevice& device) : xeWindow{window}, xeDevice{device} {
diff --git a/engine/xe_renderer.hpp b/engine/xe_renderer.hpp
index 321a4e3..994b157 100644
--- a/engine/xe_renderer.hpp
+++ b/engine/xe_renderer.hpp
@@ -1,13 +1,16 @@
 #pragma once
 
+#include "xe_device.hpp"
+#include "xe_game_object.hpp"
 #include "xe_swap_chain.hpp"
+#include "xe_descriptors.hpp"
 #include "xe_window.hpp"
-#include "xe_device.hpp"
-#include "xe_model.hpp"
 
-#include <memory>
-#include <vector>
+#include <array>
 #include <cassert>
+#include <stdexcept>
+#include <memory>
+#include <vulkan/vulkan_core.h>
 
 namespace xe {
 class XeRenderer {
diff --git a/engine/xe_sound.cpp b/engine/xe_sound.cpp
index 07d8e7b..bd21885 100644
--- a/engine/xe_sound.cpp
+++ b/engine/xe_sound.cpp
@@ -1,9 +1,5 @@
 #include "xe_sound.hpp"
 
-#include <vector>
-#include <stdexcept>
-#include <iostream>
-
 namespace xe {
 
 XeSound::XeSound(const std::string& filename) {
diff --git a/engine/xe_sound.hpp b/engine/xe_sound.hpp
index b2a7a14..4a50839 100644
--- a/engine/xe_sound.hpp
+++ b/engine/xe_sound.hpp
@@ -4,6 +4,9 @@
 #include <AL/alc.h>
 #include <AL/alut.h>
 #include <string>
+#include <vector>
+#include <stdexcept>
+#include <iostream>
 
 #define GLM_FORCE_RADIANS
 #define GLM_FORCE_DEPTH_ZERO_TO_ONE
diff --git a/engine/xe_swap_chain.cpp b/engine/xe_swap_chain.cpp
index c7a0345..79da771 100755
--- a/engine/xe_swap_chain.cpp
+++ b/engine/xe_swap_chain.cpp
@@ -1,14 +1,5 @@
 #include "xe_swap_chain.hpp"
 
-#include <array>
-#include <cstdlib>
-#include <cstring>
-#include <iostream>
-#include <limits>
-#include <memory>
-#include <set>
-#include <stdexcept>
-
 namespace xe {
 
 bool XeSwapChain::initialSwapChainCreated = false;
diff --git a/engine/xe_swap_chain.hpp b/engine/xe_swap_chain.hpp
index a15a5a0..bf07be4 100755
--- a/engine/xe_swap_chain.hpp
+++ b/engine/xe_swap_chain.hpp
@@ -4,10 +4,14 @@
 
 #include <vulkan/vulkan.h>
 
+#include <array>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <limits>
 #include <memory>
-#include <string>
-#include <vector>
-#include <vulkan/vulkan_core.h>
+#include <set>
+#include <stdexcept>
 
 namespace xe {
 
diff --git a/engine/xe_window.cpp b/engine/xe_window.cpp
index 2721279..ee19b92 100755
--- a/engine/xe_window.cpp
+++ b/engine/xe_window.cpp
@@ -1,8 +1,4 @@
 #include "xe_window.hpp"
-#include <GLFW/glfw3.h>
-#include <stdexcept>
-
-#include <stdexcept>
 
 namespace xe {
 
diff --git a/engine/xe_window.hpp b/engine/xe_window.hpp
index bf80bd7..02f3e3d 100755
--- a/engine/xe_window.hpp
+++ b/engine/xe_window.hpp
@@ -2,9 +2,12 @@
 
 #include <vulkan/vulkan_core.h>
 #define GLFW_INCLUDE_VULKAN
-#include <GLFW/glfw3.h>
 
+#include <GLFW/glfw3.h>
+#include <GLFW/glfw3.h>
+#include <stdexcept>
 #include <string>
+
 namespace xe {
     
 class XeWindow {
@@ -33,6 +36,7 @@ class XeWindow {
     
     std::string windowName;
     GLFWwindow *window;
+
 };
  
 }
\ No newline at end of file
diff --git a/lib/openal b/lib/openal
new file mode 160000
+Subproject c52df6d78ab7131a543326cd2257f267036754e
diff --git a/src/first_app.cpp b/src/first_app.cpp
index 423012a..5d8fcf1 100755
--- a/src/first_app.cpp
+++ b/src/first_app.cpp
@@ -1,22 +1,5 @@
 #include "first_app.hpp"
 
-#include "xe_camera.hpp"
-#include "xe_engine.hpp"
-#include "xe_game_object.hpp"
-#include "xe_model.hpp"
-#include "xe_render_system.hpp"
-#include "keyboard_movement_controller.hpp"
-#include "simple_renderer.hpp"
-#include "xe_sound.hpp"
-
-#define GLM_FORCE_RADIANS
-#define GLM_FORCE_DEPTH_ZERO_TO_ONE
-#include <glm/glm.hpp>
-#include <glm/gtc/constants.hpp>
-#include <array>
-
-#include <string>
-
 namespace app {
 
 FirstApp::FirstApp() : xeEngine{WIDTH, HEIGHT, "Xenon Vulkan Engine"} {
@@ -45,7 +28,7 @@ void FirstApp::run() {
 
     float frameTime = xeEngine.getFrameTime();
 
-    cameraController.moveInPlaneXZ(xeEngine.getWindow().getGLFWwindow(), frameTime, viewerObject);
+    cameraController.update(xeEngine.getInput(), viewerObject, frameTime);
     xeEngine.getCamera().setViewYXZ(viewerObject.transform.translation, viewerObject.transform.rotation);
 
     if(xeEngine.beginFrame()) {
diff --git a/src/first_app.hpp b/src/first_app.hpp
index d8942ab..a630d47 100755
--- a/src/first_app.hpp
+++ b/src/first_app.hpp
@@ -1,9 +1,16 @@
 #pragma once
 
 #include "xe_engine.hpp"
-#include "xe_game_object.hpp"
-#include "xe_descriptors.hpp"
 
+#include "keyboard_movement_controller.hpp"
+#include "simple_renderer.hpp"
+
+#define GLM_FORCE_RADIANS
+#define GLM_FORCE_DEPTH_ZERO_TO_ONE
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+#include <array>
+#include <string>
 #include <memory>
 #include <vector>
 
diff --git a/src/keyboard_movement_controller.cpp b/src/keyboard_movement_controller.cpp
index 325693e..1f1a0a7 100644
--- a/src/keyboard_movement_controller.cpp
+++ b/src/keyboard_movement_controller.cpp
@@ -1,17 +1,13 @@
 #include "keyboard_movement_controller.hpp"
-#include <glm/common.hpp>
-#include <glm/fwd.hpp>
-#include <glm/geometric.hpp>
-#include <limits>
 
 namespace app {
 
-void KeyboardMovementController::moveInPlaneXZ(GLFWwindow* window, float dt, xe::XeGameObject& gameObject) {
+void KeyboardMovementController::update(xe::XeInput &input, xe::XeGameObject& gameObject, float dt) {
   glm::vec3 rotate{0};
-  if(glfwGetKey(window, keys.lookRight) == GLFW_PRESS) rotate.y += 1.f;
-  if(glfwGetKey(window, keys.lookLeft) == GLFW_PRESS) rotate.y -= 1.f;
-  if(glfwGetKey(window, keys.lookUp) == GLFW_PRESS) rotate.x -= 1.f;
-  if(glfwGetKey(window, keys.lookDown) == GLFW_PRESS) rotate.x += 1.f;
+  if(input.isKeyPressed(keys.lookRight)) rotate.y += 1.f;
+  if(input.isKeyPressed(keys.lookLeft)) rotate.y -= 1.f;
+  if(input.isKeyPressed(keys.lookUp)) rotate.x -= 1.f;
+  if(input.isKeyPressed(keys.lookDown)) rotate.x += 1.f;
 
   if (glm::dot(rotate, rotate) > std::numeric_limits<float>::epsilon()) {
     gameObject.transform.rotation += lookSpeed * dt * glm::normalize(rotate);
@@ -26,12 +22,12 @@ void KeyboardMovementController::moveInPlaneXZ(GLFWwindow* window, float dt, xe:
   const glm::vec3 upDir{0.f, 01.f, 0.f};
 
   glm::vec3 moveDir{0};
-  if(glfwGetKey(window, keys.moveForward) == GLFW_PRESS) moveDir += forwardDir;
-  if(glfwGetKey(window, keys.moveBackward) == GLFW_PRESS) moveDir -= forwardDir;
-  if(glfwGetKey(window, keys.moveRight) == GLFW_PRESS) moveDir += rightDir;
-  if(glfwGetKey(window, keys.moveLeft) == GLFW_PRESS) moveDir -= rightDir;
-  if(glfwGetKey(window, keys.moveUp) == GLFW_PRESS) moveDir += upDir;
-  if(glfwGetKey(window, keys.moveDown) == GLFW_PRESS) moveDir -= upDir;
+  if(input.isKeyPressed(keys.moveForward)) moveDir += forwardDir;
+  if(input.isKeyPressed(keys.moveBackward)) moveDir -= forwardDir;
+  if(input.isKeyPressed(keys.moveRight)) moveDir += rightDir;
+  if(input.isKeyPressed(keys.moveLeft)) moveDir -= rightDir;
+  if(input.isKeyPressed(keys.moveUp)) moveDir += upDir;
+  if(input.isKeyPressed(keys.moveDown)) moveDir -= upDir;
 
   if (glm::dot(moveDir, moveDir) > std::numeric_limits<float>::epsilon()) {
     gameObject.transform.translation += moveSpeed * dt * glm::normalize(moveDir);
diff --git a/src/keyboard_movement_controller.hpp b/src/keyboard_movement_controller.hpp
index b3e3a15..a9ba031 100644
--- a/src/keyboard_movement_controller.hpp
+++ b/src/keyboard_movement_controller.hpp
@@ -1,27 +1,31 @@
 #pragma once
 
 #include "xe_game_object.hpp"
-#include "xe_window.hpp"
-#include <GLFW/glfw3.h>
+#include "xe_input.hpp"
+
+#include <glm/common.hpp>
+#include <glm/fwd.hpp>
+#include <glm/geometric.hpp>
+#include <limits>
 
 namespace app {
   class KeyboardMovementController {
 
     public:
       struct KeyMappings {
-        int moveLeft = GLFW_KEY_A;
-        int moveRight = GLFW_KEY_D;
-        int moveForward = GLFW_KEY_W;
-        int moveBackward = GLFW_KEY_S;
-        int moveUp = GLFW_KEY_E;
-        int moveDown = GLFW_KEY_Q;
-        int lookLeft = GLFW_KEY_LEFT;
-        int lookRight = GLFW_KEY_RIGHT;
-        int lookUp = GLFW_KEY_UP;
-        int lookDown = GLFW_KEY_DOWN;
+        int moveLeft = KEY_A;
+        int moveRight = KEY_D;
+        int moveForward = KEY_W;
+        int moveBackward = KEY_S;
+        int moveUp = KEY_E;
+        int moveDown = KEY_Q;
+        int lookLeft = KEY_LEFT;
+        int lookRight = KEY_RIGHT;
+        int lookUp = KEY_UP;
+        int lookDown = KEY_DOWN;
       };
 
-      void moveInPlaneXZ(GLFWwindow* window, float dt, xe::XeGameObject& gameObject);
+      void update(xe::XeInput &input, xe::XeGameObject& gameObject, float dt);
 
       KeyMappings keys{};
       float moveSpeed{3.f};
diff --git a/src/simple_renderer.cpp b/src/simple_renderer.cpp
index 921019a..5a57324 100644
--- a/src/simple_renderer.cpp
+++ b/src/simple_renderer.cpp
@@ -1,7 +1,4 @@
 #include "simple_renderer.hpp"
-#include "xe_render_system.hpp"
-
-#include <iostream>
 
 namespace app {
 
diff --git a/src/simple_renderer.hpp b/src/simple_renderer.hpp
index d9be7b2..9dbfd1c 100644
--- a/src/simple_renderer.hpp
+++ b/src/simple_renderer.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "xe_render_system.hpp"
+
 #include <string>
 
 namespace app {