diff --git a/VaporWaveWars/combat.cpp b/VaporWaveWars/combat.cpp
index 5fa40a8..71ed72b 100644
--- a/VaporWaveWars/combat.cpp
+++ b/VaporWaveWars/combat.cpp
@@ -3,7 +3,7 @@
 Combat::Combat() {
     ia = playerOneTurn = true;
     enemy = new IaEnemy();
-
+    initShader();
 }
 
 Combat::Combat(bool ia) {
@@ -11,17 +11,26 @@ Combat::Combat(bool ia) {
     playerOneTurn = true;
     if (ia) enemy = new IaEnemy();
     else enemy = new Player();
+    initShader();
+}
+
+void Combat::initShader() {
+    _text.create(W_WIDTH, W_HEIGHT);
+    _background.setTexture(_text);
+    _shader.loadFromFile("./resources/shader.frag", sf::Shader::Fragment);
+    _shader.setParameter("resolution", sf::Vector2f(W_WIDTH, W_HEIGHT));
 }
 
 void Combat::update(float deltaTime, sf::RenderWindow *window) {
     if (playerOneTurn) player.update(deltaTime, window);
     else if (ia) playerOneTurn = enemy->update(deltaTime, window);
+    _shader.setParameter("time", deltaTime);
 }
 
 void Combat::draw(sf::RenderWindow *window) {
     player.draw(window);
     enemy->draw(window);
-
+    window->draw(_background, &_shader);
 }
 
 void Combat::updateEvents(sf::Event e) {
diff --git a/VaporWaveWars/combat.hpp b/VaporWaveWars/combat.hpp
index 88298ae..fd0a6a6 100644
--- a/VaporWaveWars/combat.hpp
+++ b/VaporWaveWars/combat.hpp
@@ -23,8 +23,11 @@ private:
     bool playerOneTurn, ia;
     Player player;
     Actor *enemy;
+    sf::Texture _text;
     sf::Sprite _background;
-    static sf::Shader _shader;
+    sf::Shader _shader;
+
+    void initShader();
 
 };
 
diff --git a/VaporWaveWars/commons.hpp b/VaporWaveWars/commons.hpp
index 9e82ae6..90c1977 100644
--- a/VaporWaveWars/commons.hpp
+++ b/VaporWaveWars/commons.hpp
@@ -12,6 +12,8 @@ const int SCENE_NUM = 4;
 
 #define MARGEERR 0.30f
 #define BLACKVALUE 0.00025f
+#define W_WIDTH  800
+#define W_HEIGHT 600
 
 #define ASSERT(expression) do \
 { \
diff --git a/VaporWaveWars/game.cpp b/VaporWaveWars/game.cpp
index 075c49e..3cfb4e8 100644
--- a/VaporWaveWars/game.cpp
+++ b/VaporWaveWars/game.cpp
@@ -20,7 +20,7 @@ Game* Game::i() {
 // Main game loop
 void Game::run() {
     sf::Clock c;
-    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML window");
+    sf::RenderWindow window(sf::VideoMode(W_WIDTH, W_HEIGHT), "SFML window");
     float oldTime = c.getElapsedTime().asSeconds();
     while (isRunning) {
         float time = c.getElapsedTime().asSeconds();