add: own branch

src/main/java/org/toop/graphics/Renderer.java

@@ -0,0 +1,50 @@
+package org.toop.graphics;
+
+import org.toop.platform.graphics.opengl.*;
+
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
+
+public abstract class Renderer {
+	public enum API {
+		NONE,
+		OPENGL,
+	};
+
+    protected static final Logger logger = LogManager.getLogger(Renderer.class);
+
+	private static API api = API.NONE;
+	private static Renderer instance = null;
+
+	public static Renderer setup(API api) {
+		if (instance != null) {
+			logger.warn("Renderer is already setup.");
+			return instance;
+		}
+
+		switch (api) {
+			case OPENGL:
+				instance = new OpenglRenderer();
+				break;
+
+			default:
+				logger.fatal("No valid renderer api chosen");
+				return null;
+		}
+
+		Renderer.api = api;
+		return instance;
+	}
+
+	public static API getApi() {
+		return api;
+	}
+
+	public void cleanup() {
+		instance = null;
+		logger.info("Renderer cleanup.");
+	}
+
+	public abstract void clear();
+	public abstract void render();
+}