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# Conflicts:
#	app/src/main/java/sudoku/Main.java
#	app/src/main/java/sudoku/solver/Solver.java

app/build.gradle

@@ -14,6 +14,9 @@ plugins {
 repositories {
     // Use Maven Central for resolving dependencies.
     mavenCentral()
+    flatDir {
+       dirs("$rootProject.projectDir/libs")
+   }
 }
 
 dependencies {
@@ -31,6 +34,10 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.18.2'
 
     implementation "io.github.spair:imgui-java-app:1.88.0"
+
+    implementation ":PNG-library"
+
+    runtimeOnly "org.lwjgl:lwjgl-stb::natives-windows"
 }
 
 application {

app/src/main/java/gui/Images.java

@@ -0,0 +1,66 @@
+package gui;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+import java.nio.LongBuffer;
+
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL11;
+
+import io.nayuki.png.ImageDecoder;
+import io.nayuki.png.PngImage;
+import io.nayuki.png.image.BufferedRgbaImage;
+
+public class Images {
+
+	public static int BACKGROUND;
+
+	private static int loadTexture(String fileName) {
+		// Decoding
+		PngImage png = null;
+		try {
+			png = PngImage.read(new File(fileName));
+		} catch (IOException e) {
+			e.printStackTrace();
+			return -1;
+		}
+		BufferedRgbaImage img = (BufferedRgbaImage) ImageDecoder.toImage(png);
+		ByteBuffer pixels = ByteBuffer.allocateDirect(img.getWidth() * img.getHeight() * Long.BYTES);
+		for (int y = 0; y < img.getHeight(); y++) {
+			for (int x = 0; x < img.getWidth(); x++) {
+				long value = img.getPixel(x, y);
+				int red = (int) ((value >> 48) & 0xFF);
+				int blue = (int) ((value >> 32) & 0xFF);
+				int green = (int) ((value >> 16) & 0xFF);
+				int alpha = 255;
+				pixels.putInt(red << 24 | green << 16 | blue << 8 | alpha);
+			}
+		}
+		pixels.flip();
+
+		var caca = img.getBitDepths();
+		System.out.println(caca);
+
+		int textureID = GL11.glGenTextures();
+		GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureID);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
+		GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_SKIP_PIXELS, 0); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_SKIP_ROWS, 0); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_ROW_LENGTH, 0); // Not on WebGL/ES
+		GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, img.getWidth(), img.getHeight(), 0,
+				GL11.GL_RGBA,
+				GL11.GL_UNSIGNED_BYTE, pixels);
+		GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
+
+		return textureID;
+	}
+
+	public static void loadImages() {
+		BACKGROUND = loadTexture("background.png");
+	}
+
+}

app/src/main/java/gui/Main.java

@@ -27,6 +27,12 @@ public class Main extends Application {
         stateMachine.pushState(new MainMenu(stateMachine));
     }
     
+    @Override
+    protected void preRun() {
+        super.preRun();
+        Images.loadImages();
+    }
+
     @Override
     public void process() {
         stateMachine.render();

app/src/main/java/gui/menu/StateMachine.java

@@ -2,6 +2,7 @@ package gui.menu;
 
 import java.util.Stack;
 
+import gui.Images;
 import imgui.ImGui;
 import imgui.ImVec2;
 import imgui.flag.ImGuiKey;
@@ -41,6 +42,12 @@ public class StateMachine {
 		var displaySize = ImGui.getIO().getDisplaySize();
 		ImGui.setNextWindowPos(new ImVec2(0.0f, 0.0f));
 		ImGui.setNextWindowSize(displaySize);
+		ImGui.begin("Background", null, ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoMove
+		| ImGuiWindowFlags.NoSavedSettings | ImGuiWindowFlags.NoBackground  | ImGuiWindowFlags.NoBringToFrontOnFocus | ImGuiWindowFlags.NoInputs);
+		ImGui.image(Images.BACKGROUND, displaySize, new ImVec2(displaySize.x / 100, displaySize.y / 100));
+		ImGui.end();
+		ImGui.setNextWindowPos(new ImVec2(0.0f, 0.0f));
+		ImGui.setNextWindowSize(displaySize);
 		ImGui.begin("##Main Window", null, ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoMove
 				| ImGuiWindowFlags.NoSavedSettings | ImGuiWindowFlags.NoBackground);
 		menus.get(menus.size() - 1).render();