use imgui docking

sandbox/src/Application.cpp

@@ -1,5 +1,6 @@
 #include <quark.hpp>
-#include "quark/imgui/ImGuiLayer.hpp"
+#include <glm/vec3.hpp>
+#include "imgui.h"
 
 class ExampleLayer :
 	public qk::Layer
@@ -7,10 +8,25 @@ class ExampleLayer :
 public:
 	ExampleLayer() :
 		Layer("Example")
-	{ }
+	{
+		glm::vec3 test = { 0.0f, 1.0f, 0.75f };
+	}
 
 	void OnUpdate() override {
 		// QK_TRACE("ExampleLayer::Update");
+		
+		if (qk::Input::IsKeyDown(QK_KEY_TAB)) {
+			QK_TRACE("Tab pressed");
+		}
+	}
+
+	void OnImGuiRender() override {
+		static bool open = true;
+
+		if (ImGui::Begin("Example window", &open)) {
+			ImGui::Text("Example text");
+			ImGui::End();
+		}
 	}
 
 	void OnEvent(qk::Event& event) override {
@@ -24,7 +40,6 @@ class Sandbox :
 public:
 	Sandbox() {
 		PushLayer(new ExampleLayer);
-		PushOverlay(new qk::ImGuiLayer);
 	}
 };