ImGui & UserInterface class

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "Dependencies/glm"]
 	path = Dependencies/glm
 	url = https://github.com/g-truc/glm
+[submodule "Dependencies/imgui"]
+	path = Dependencies/imgui
+	url = https://github.com/Light3039/imgui

BuildScripts/premake5.lua

@@ -23,3 +23,4 @@ include "../Engine/"
 group "Dependencies"
 include "../Dependencies/GLFW/"
 include "../Dependencies/GLAD/"
+include "../Dependencies/imgui/"

Dependencies/GLAD/premake5.lua

@@ -15,6 +15,8 @@ project "GLAD"
 	{
 		"**.c",
 		"**.h",
+
+		"premake5.lua"
 	}
 	
 	-- Dependencies --

Dependencies/imgui

@@ -0,0 +1 @@
+Subproject commit 04fd5072fbc635cc7a8814b8543d40836248d3a7

Engine/premake5.lua

@@ -35,6 +35,8 @@ project "Engine"
 		(dependenciesdir .. "spdlog/include/"),
 		(dependenciesdir .. "glfw/include/"),
 		(dependenciesdir .. "glad/include"),
+		(dependenciesdir .. "imgui/"),
+		(dependenciesdir .. "imgui/backends"),
 		(dependenciesdir .. "glm/"),
 	}
 
@@ -42,6 +44,7 @@ project "Engine"
 	{
 		"GLFW",
 		"GLAD",
+		"ImGui",
 	}
 	
 	--- Filters ---

Engine/src/Engine/Core/Application.cpp

@@ -32,6 +32,10 @@ namespace Light {
 
 			m_Window->GetGfxContext()->GetRenderCommand()->SwapBuffers();
 			m_Window->GetGfxContext()->GetRenderCommand()->ClearBackBuffer();
+
+			m_Window->GetGfxContext()->GetUserInterface()->Begin();
+
+			m_Window->GetGfxContext()->GetUserInterface()->End();
 		}
 	}
 

Engine/src/Engine/Graphics/GraphicsContext.cpp

@@ -5,7 +5,7 @@
 
 namespace Light {
 
-	GraphicsContext* GraphicsContext::s_Context;
+	GraphicsContext* GraphicsContext::s_Context = nullptr;
 
 	GraphicsContext* GraphicsContext::Create(GraphicsAPI api, GLFWwindow* windowHandle)
 	{
@@ -15,6 +15,7 @@ namespace Light {
 		case Light::GraphicsAPI::OpenGL:
 			s_Context = new glGraphicsContext(windowHandle);
 			s_Context->m_RenderCommand = std::unique_ptr<RenderCommand>(RenderCommand::Create(windowHandle));
+			s_Context->m_UserInterface = std::unique_ptr<UserInterface>(UserInterface::Create(windowHandle));
 			// ...Renderer
 			// ...UserInterface...
 

Engine/src/Engine/Graphics/GraphicsContext.h

@@ -4,6 +4,8 @@
 
 #include "RenderCommand.h"
 
+#include "UserInterface/UserInterface.h"
+
 struct GLFWwindow {};
 
 namespace Light {
@@ -19,6 +21,7 @@ namespace Light {
 		static GraphicsContext* s_Context;
 
 		std::unique_ptr<RenderCommand> m_RenderCommand;
+		std::unique_ptr<UserInterface> m_UserInterface;
 	protected:
 		GraphicsAPI m_GraphicsAPI;
 
@@ -29,7 +32,8 @@ namespace Light {
 
 		static inline GraphicsAPI GetGraphicsAPI() { return s_Context->m_GraphicsAPI; }
 
-		virtual RenderCommand* GetRenderCommand() { return m_RenderCommand.get(); }
+		inline RenderCommand* GetRenderCommand() { return m_RenderCommand.get(); }
+		inline UserInterface* GetUserInterface() { return m_UserInterface.get(); }
 	};
 
 }

Engine/src/Engine/Layer/Layer.h

@@ -14,12 +14,17 @@ namespace Light {
 	{
 	private:
 		std::string m_Name;
+
 	public:
 		Layer(const std::string& name): m_Name(name) {}
 		virtual ~Layer() = default;
 
 		inline const std::string& GetName() const { return m_Name; }
 
+		// Updates
+		virtual void OnUpdate(float deltaTime) {}
+		virtual void OnUserInterfaceUpdate() {}
+
 		// Mouse events
 		virtual bool OnMouseMoved(const MouseMovedEvent& event) { return false; }
 		virtual bool OnButtonPressed(const ButtonPressedEvent& event) { return false; }

Engine/src/Engine/Layer/LayerStack.cpp

@@ -2,30 +2,32 @@
 #include "LayerStack.h"
 
 #include <functional>
+
 namespace Light {
 
+	LayerStack* LayerStack::s_Context = nullptr;
+
+	LayerStack::LayerStack()
+	{
+		s_Context = this; // TODO: ASSERT
+	}
+
 	LayerStack::~LayerStack()
 	{
 		for (Layer* layer : m_Layers)
 			delete layer;
 	}
 
-	void LayerStack::PushLayer(Layer* layer)
+	void LayerStack::OnUpdate(float deltaTime)
 	{
-		m_Layers.push_back(layer);
+		for (auto it = m_Begin; it != m_End; it++)
-		m_Begin = m_Layers.begin();
+			(*it)->OnUpdate(deltaTime);
-		m_End = m_Layers.end();
-
-		LT_ENGINE_TRACE("LayerStack::PushLayer: Attached [{}]", layer->GetName());
 	}
 
-	void LayerStack::PopLayer(Layer* layer)
+	void LayerStack::OnUserInterfaceUpdate()
 	{
-		m_Layers.erase(std::find(m_Layers.begin(), m_Layers.end(), layer));
+		for (auto it = m_Begin; it != m_End; it++)
-		m_Begin = m_Layers.begin();
+			(*it)->OnUserInterfaceUpdate();
-		m_End = m_Layers.end();
-
-		LT_ENGINE_TRACE("LayerStack::PushLayer: Detatched[{}]", layer->GetName());
 	}
 
 	void LayerStack::OnEvent(const Event& event)
@@ -84,5 +86,22 @@ namespace Light {
 		}
 	}
 
+	void LayerStack::AttachLayerImpl(Layer* layer)
+	{
+		m_Layers.push_back(layer);
+		m_Begin = m_Layers.begin();
+		m_End = m_Layers.end();
+
+		LT_ENGINE_TRACE("LayerStack::PushLayer: Attached [{}]", layer->GetName());
+	}
+
+	void LayerStack::DetatchLayerImpl(Layer* layer)
+	{
+		m_Layers.erase(std::find(m_Layers.begin(), m_Layers.end(), layer));
+		m_Begin = m_Layers.begin();
+		m_End = m_Layers.end();
+
+		LT_ENGINE_TRACE("LayerStack::PushLayer: Detatched[{}]", layer->GetName());
+	}
 
 }

Engine/src/Engine/Layer/LayerStack.h

@@ -13,22 +13,32 @@ namespace Light {
 	class LayerStack
 	{
 	private:
+		static LayerStack* s_Context;
+
 		std::vector<Layer*> m_Layers;
 
 		std::vector<Layer*>::iterator m_Begin;
 		std::vector<Layer*>::iterator m_End;
 		
-		
 	public:
+		LayerStack();
 		~LayerStack();
 
-		void PushLayer(Layer* layer);
+		static inline void AttachLayer(Layer* layer) { s_Context->AttachLayerImpl(layer); }
-		void PopLayer(Layer* layer);
+		static inline void DetatchLayer(Layer* layer) { s_Context->DetatchLayerImpl(layer); }
+
+		void OnUpdate(float deltaTime);
+		void OnUserInterfaceUpdate();
 
 		void OnEvent(const Event& event);
 
 		std::vector<Layer*>::iterator begin() { return m_Layers.begin(); }
 		std::vector<Layer*>::iterator end() { return m_Layers.end(); }
+
+	private:
+		void AttachLayerImpl(Layer* layer);
+		void DetatchLayerImpl(Layer* layer);
+
 	};
 
 }

Engine/src/Engine/UserInterface/UserInterface.cpp

@@ -1,11 +1,19 @@
 #include "ltpch.h"
+#include "UserInterface.h"
+
+#include "Graphics/GraphicsContext.h"
+
+#include "OpenGL/glUserInterface.h"
 
 namespace Light {
 
-	class UserInterface
+	UserInterface* UserInterface::Create(GLFWwindow* windowHandle)
 	{
-	private:
+		switch (GraphicsContext::GetGraphicsAPI())
-	public:
+		{
-	};
+		case GraphicsAPI::OpenGL:
+			return new glUserInterface(windowHandle);
+		}
+	}
 
 }

Engine/src/Engine/UserInterface/UserInterface.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Base.h"
+
+struct GLFWwindow;
+
+namespace Light {
+
+	class UserInterface
+	{
+	private:
+	public:
+		static UserInterface* Create(GLFWwindow* windowHandle);
+
+		virtual void Begin() = 0;
+		virtual void End() = 0;
+	};
+
+}

Engine/src/Platform/GraphicsAPI/OpenGL/glUserInterface.cpp

@@ -0,0 +1,45 @@
+#include "ltpch.h"
+#include "glUserInterface.h"
+
+#include <imgui.h>
+#include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
+
+namespace Light {
+
+	glUserInterface::glUserInterface(GLFWwindow* windowHandle)
+	{
+		IMGUI_CHECKVERSION();
+		ImGui::CreateContext();
+		ImGuiIO& io = ImGui::GetIO();
+		io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+
+		ImGui::StyleColorsDark();
+
+		ImGui_ImplGlfw_InitForOpenGL(windowHandle, true);
+		ImGui_ImplOpenGL3_Init();
+	}
+
+	glUserInterface::~glUserInterface()
+	{
+		ImGui_ImplOpenGL3_Shutdown();
+		ImGui_ImplGlfw_Shutdown();
+		ImGui::DestroyContext();
+	}
+
+	void glUserInterface::Begin()
+	{
+		ImGui_ImplOpenGL3_NewFrame();
+		ImGui_ImplGlfw_NewFrame();
+		ImGui::NewFrame();
+
+		ImGui::ShowDemoWindow();
+	}
+
+	void glUserInterface::End()
+	{
+		ImGui::Render();
+		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+	}
+
+}

Engine/src/Platform/GraphicsAPI/OpenGL/glUserInterface.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Base.h"
+#include "UserInterface/UserInterface.h"
+
+namespace Light {
+
+	class glUserInterface : public UserInterface
+	{
+	private:
+	public:
+		glUserInterface(GLFWwindow* windowHandle);
+		~glUserInterface();
+
+		void Begin() override;
+		void End() override;
+	};
+
+}

Sandbox/imgui.ini

@@ -0,0 +1,10 @@
+[Window][Debug##Default]
+Pos=60,60
+Size=400,400
+Collapsed=0
+
+[Window][Dear ImGui Demo]
+Pos=219,40
+Size=550,536
+Collapsed=0
+

Sandbox/premake5.lua

@@ -16,7 +16,8 @@ project "Sandbox"
 	{
 		"%{prj.location}/src/**.h",
 		"%{prj.location}/src/**.cpp",
-		"%{prj.location}/**.lua",
+
+		"%{prj.location}/premake5.lua",
 	}
 
 	-- Dependencies --
@@ -30,12 +31,17 @@ project "Sandbox"
 
 		-- 3rd party
 		(dependenciesdir .. "spdlog/include/"),
+		(dependenciesdir .. "imgui/"),
+		(dependenciesdir .. "imgui/backends"),
 		(dependenciesdir .. "glm/"),
 	}
 
 	links
 	{
 		"Engine",
+		"GLFW",
+		"GLAD",
+		"ImGui",
 	}
 
 	--- Filters ---

Sandbox/src/SandboxApp.cpp

@@ -1,11 +1,15 @@
 #include <LightEngine.h>
 
+#include "SandboxLayer.h"
+
 class Sandbox : public Light::Application
 {
 public:
 	Sandbox()
 	{
 		LT_CLIENT_TRACE("Sandbox::Sandbox");
+
+		Light::LayerStack::AttachLayer(new SandboxLayer("SandboxLayer"));
 	}
 
 	~Sandbox()

Sandbox/src/SandboxLayer.h

@@ -1,9 +1,9 @@
 #include <LightEngine.h>
 
-class TestLayer : public Light::Layer
+class SandboxLayer : public Light::Layer
 {
 public:
-	TestLayer(const std::string& name) : Light::Layer(name) {}
+	SandboxLayer(const std::string& name): Light::Layer(name) {}
 
 	// Mouse events
 	virtual bool OnMouseMoved(const Light::MouseMovedEvent& event) override { LT_ENGINE_TRACE("{}", event.GetInfoLog()); return false; }