Framebuffer

- Added 'Framebuffer'
- Added an optional 'FrameBuffer' parameter to'Renderer::BeginScene'
- Added 'RenderCommand::DefaultTargetFramebuffer()'
- Added static 'GraphicsContext::GetSharedContext()'

- Fixed 'dxBlender' by changing 'DestBlendAlpha' from D3D11_BLEND_ZERO
       to D3D11_BLEND_ONE
- Fixed 'glRenderCommand::ClearBackBuffer()' by calling glClear before
      glClearColor

- 'Application::GameLoop' now updates the ui ._.

Engine/src/Engine/Core/Application.cpp

@@ -3,19 +3,17 @@
 
 #include "Window.h"
 
-#include "Events/Event.h"
-
 #include "Debug/Instrumentor.h"
 
+#include "Events/Event.h"
+
 #include "Graphics/GraphicsContext.h"
 #include "Graphics/Renderer.h"
 #include "Graphics/RenderCommand.h"
 
-#include "UserInterface/UserInterface.h"
-
 #include "Time/Timer.h"
 
-#include <filesystem>
+#include "UserInterface/UserInterface.h"
 
 namespace Light {
 
@@ -37,7 +35,7 @@ namespace Light {
 	void Application::GameLoop()
 	{
 		// check
-		LT_ENGINE_ASSERT(!m_LayerStack.IsEmpty(), "Application::GameLoop(pre): LayerStack is empty");
+		// LT_ENGINE_ASSERT(!m_LayerStack.IsEmpty(), "Application::GameLoop(pre): LayerStack is empty");
 
 		// log debug data
 		LogDebugData();
@@ -73,6 +71,7 @@ namespace Light {
 				// render user interface
 				LT_PROFILE_SCOPE("GameLoop::UserInterface");
 				m_Window->GetGfxContext()->GetUserInterface()->Begin();
+				m_LayerStack.OnUserInterfaceUpdate();
 				m_Window->GetGfxContext()->GetUserInterface()->End();
 			}
 

Engine/src/Engine/Graphics/Framebuffer.cpp

@@ -0,0 +1,30 @@
+#include "ltpch.h"
+#include "Framebuffer.h"
+#include "OpenGL/glFramebuffer.h"
+
+#ifdef LIGHT_PLATFORM_WINDOWS
+	#include "DirectX/dxFramebuffer.h"
+	#include "DirectX/dxSharedContext.h"
+#endif
+
+#include "GraphicsContext.h"
+
+namespace Light {
+
+	Framebuffer* Framebuffer::Create(const FramebufferSpecification& specification, std::shared_ptr<SharedContext> sharedContext)
+	{
+		switch (GraphicsContext::GetGraphicsAPI())
+		{
+		case GraphicsAPI::OpenGL:
+			return new glFramebuffer(specification);
+
+		case GraphicsAPI::DirectX: LT_WIN(
+			return new dxFramebuffer(specification, std::static_pointer_cast<dxSharedContext>(sharedContext));)
+
+		default:
+			LT_ENGINE_ASSERT(false, "Shader::Create: invalid/unsupported 'GraphicsAPI' {}", GraphicsContext::GetGraphicsAPI());
+			return nullptr;
+		}
+	}
+
+}

Engine/src/Engine/Graphics/Framebuffer.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "Base.h"
+
+#include <glm/glm.hpp>
+
+namespace Light {
+
+	class SharedContext;
+
+	struct FramebufferSpecification
+	{
+		unsigned int width, height;
+		unsigned int samples = 1;
+
+		glm::uvec4 defaultColor = glm::uvec4(0u);
+
+		bool swapChainTarget = false; // render to the screen
+	};
+
+	class Framebuffer
+	{
+	public:
+		static Framebuffer* Create(const FramebufferSpecification& specification, std::shared_ptr<SharedContext> sharedContext);
+
+		virtual void* GetColorAttachment() = 0;
+
+		virtual void BindAsTarget() = 0;
+		virtual void BindAsResource() = 0;
+
+	protected:
+		Framebuffer() = default;
+	};
+
+}

Engine/src/Engine/Graphics/GraphicsContext.h

@@ -47,10 +47,12 @@ namespace Light {
 		virtual void LogDebugData() = 0;
 
 		static inline GraphicsAPI GetGraphicsAPI() { return s_Context->m_GraphicsAPI; }
+		static inline std::shared_ptr<SharedContext> GetSharedContext() { return s_Context->m_SharedContext; }
 
 		inline Renderer* GetRenderer() { return m_Renderer.get(); }
 		inline UserInterface* GetUserInterface() { return m_UserInterface.get(); }
 
+
 	protected:
 		GraphicsContext() = default;
 

Engine/src/Engine/Graphics/RenderCommand.h

@@ -24,6 +24,8 @@ namespace Light {
 		virtual void Draw(unsigned int count) = 0;
 		virtual void DrawIndexed(unsigned int count) = 0;
 
+		virtual void DefaultTargetFramebuffer() = 0;
+
 		virtual void SetViewport(unsigned int x, unsigned int y, unsigned int width, unsigned int height) = 0;
 
 	protected:

Engine/src/Engine/Graphics/Renderer.cpp

@@ -5,6 +5,7 @@
 #include "Buffers.h"
 #include "Texture.h"
 #include "RenderCommand.h"
+#include "Framebuffer.h"
 
 #include "Events/WindowEvents.h"
 
@@ -124,8 +125,16 @@ namespace Light {
 		m_RenderCommand->ClearBackBuffer();
 	}
 
-	void Renderer::BeginSceneImpl(const std::shared_ptr<Camera>& camera)
+	void Renderer::BeginSceneImpl(const std::shared_ptr<Camera>& camera, const std::shared_ptr<Framebuffer>& targetFrameBuffer /* = nullptr */)
 	{
+		m_TargetFramebuffer = targetFrameBuffer;
+
+		if (targetFrameBuffer)
+			targetFrameBuffer->BindAsTarget();
+		else
+			m_RenderCommand->DefaultTargetFramebuffer();
+
+
 		glm::mat4* map = (glm::mat4*)m_ViewProjectionBuffer->Map();
 		map[0] = camera->GetProjection() * camera->GetView();
 		m_ViewProjectionBuffer->UnMap();
@@ -144,6 +153,8 @@ namespace Light {
 
 	void Renderer::EndSceneImpl()
 	{
+		// m_Blender->Disable();
+		m_Blender->Enable(BlendFactor::SRC_ALPHA, BlendFactor::INVERSE_SRC_ALPHA);
 		m_QuadRenderer.UnMap();
 		m_TextureRenderer.UnMap();
 
@@ -160,6 +171,12 @@ namespace Light {
 			m_TextureRenderer.Bind();
 			m_RenderCommand->DrawIndexed(m_TextureRenderer.GetQuadCount() * 6u);
 		}
+
+		if(m_TargetFramebuffer)
+		{
+			m_TargetFramebuffer = nullptr;
+			m_RenderCommand->DefaultTargetFramebuffer();
+		}
 	}
 
 }

Engine/src/Engine/Graphics/Renderer.h

@@ -4,6 +4,7 @@
 
 #include "Buffers.h"
 #include "Blender.h"
+#include "Framebuffer.h"
 
 #include "RendererPrograms/QuadRendererProgram.h"
 #include "RendererPrograms/TextureRendererProgram.h"
@@ -18,6 +19,8 @@ namespace Light {
 	class RenderCommand;
 	class Blender;
 
+	class Framebuffer;
+
 	class Camera;
 
 	class Texture;
@@ -41,13 +44,17 @@ namespace Light {
 		std::unique_ptr<RenderCommand> m_RenderCommand;
 		std::unique_ptr<Blender> m_Blender;
 
+		std::shared_ptr<Framebuffer> m_TargetFramebuffer;
+
 	public:
 		static Renderer* Create(GLFWwindow* windowHandle, std::shared_ptr<SharedContext> sharedContext);
 		
+		static inline void SetTargetFramebuffer(std::shared_ptr<Framebuffer> framebuffer) { s_Context->SetTargetFramebufferImpl(framebuffer); }
+
 		static inline void DrawQuad(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint) { s_Context->DrawQuadImpl(position, size, tint); }
 		static inline void DrawQuad(const glm::vec3& position, const glm::vec2& size, std::shared_ptr<Texture> texture) { s_Context->DrawQuadImpl(position, size, texture); }
 
-		static inline void BeginScene(const std::shared_ptr<Camera>& camera) { s_Context->BeginSceneImpl(camera); }
+		static inline void BeginScene(const std::shared_ptr<Camera>& camera, const std::shared_ptr<Framebuffer>& targetFrameBuffer = nullptr) { s_Context->BeginSceneImpl(camera, targetFrameBuffer); }
 		static inline void EndScene() { s_Context->EndSceneImpl(); }
 		
 		void OnWindowResize(const WindowResizedEvent& event);
@@ -58,10 +65,12 @@ namespace Light {
 	private:
 		Renderer(GLFWwindow* windowHandle, std::shared_ptr<SharedContext> sharedContext);
 
+		void SetTargetFramebufferImpl(std::shared_ptr<Framebuffer> framebuffer);
+
 		void DrawQuadImpl(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint);
 		void DrawQuadImpl(const glm::vec3& position, const glm::vec2& size, std::shared_ptr<Texture> texture);
 
-		void BeginSceneImpl(const std::shared_ptr<Camera>& camera);
+		void BeginSceneImpl(const std::shared_ptr<Camera>& camera, const std::shared_ptr<Framebuffer>& targetFrameBuffer = nullptr);
 		void FlushScene();
 		void EndSceneImpl();
 	};

Engine/src/Platform/GraphicsAPI/DirectX/dxBlender.cpp

@@ -38,13 +38,13 @@ namespace Light {
 
 		// blender desc
 		m_Desc = { };
-		
+
 		m_Desc.RenderTarget[0].BlendEnable = true;
 		m_Desc.RenderTarget[0].SrcBlend = D3D11_BLEND_ZERO;
 		m_Desc.RenderTarget[0].DestBlend = D3D11_BLEND_ZERO;
 		m_Desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
 		m_Desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ZERO;
-		m_Desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
+		m_Desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ONE;
 		m_Desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
 		m_Desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
 
@@ -65,7 +65,7 @@ namespace Light {
 		DXC(m_Context->GetDevice()->CreateBlendState(&m_Desc, &m_BlendState));
 
 		// bind blend state
-		m_Context->GetDeviceContext()->OMSetBlendState(m_BlendState.Get(), nullptr, 0xffffffff);
+		m_Context->GetDeviceContext()->OMSetBlendState(m_BlendState.Get(), nullptr, 0x0000000f);
 	}
 
 	void dxBlender::Disable()

Engine/src/Platform/GraphicsAPI/DirectX/dxFramebuffer.cpp

@@ -0,0 +1,57 @@
+#include "ltpch.h"
+#include "dxFramebuffer.h"
+#include "dxSharedContext.h"
+
+namespace Light {
+
+	dxFramebuffer::dxFramebuffer(const FramebufferSpecification& specification, std::shared_ptr<dxSharedContext> sharedContext)
+		: m_Specification(specification), m_Context(sharedContext)
+	{
+		HRESULT hr;
+		D3D11_TEXTURE2D_DESC textureDesc = { };
+		textureDesc.Width = specification.width;
+		textureDesc.Height = specification.height;
+		textureDesc.MipLevels = 1;
+		textureDesc.ArraySize = 1;
+		textureDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+		textureDesc.SampleDesc.Count = 1u;
+		textureDesc.SampleDesc.Quality = 0u;
+		textureDesc.Usage = D3D11_USAGE_DEFAULT;
+		textureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
+		textureDesc.CPUAccessFlags = NULL;
+		textureDesc.MiscFlags = NULL;
+		DXC(m_Context->GetDevice()->CreateTexture2D(&textureDesc, nullptr, &m_ColorAttachment));
+
+		D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc = { };
+		shaderResourceViewDesc.Format = textureDesc.Format;
+		shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
+		shaderResourceViewDesc.Texture2D.MipLevels = 1;
+		shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
+		DXC(m_Context->GetDevice()->CreateShaderResourceView(m_ColorAttachment.Get(), &shaderResourceViewDesc, &m_ResourceView));
+
+		D3D11_RENDER_TARGET_VIEW_DESC rtvDesc = {};
+		rtvDesc.Format = textureDesc.Format;
+		rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
+		rtvDesc.Texture2D.MipSlice = 0u;
+		DXC(m_Context->GetDevice()->CreateRenderTargetView(m_ColorAttachment.Get(), &rtvDesc, &m_RenderTargetView));
+	}
+
+	void dxFramebuffer::BindAsTarget()
+	{
+		FLOAT color[] = {
+			m_Specification.defaultColor.r,
+			m_Specification.defaultColor.g,
+			m_Specification.defaultColor.b,
+			m_Specification.defaultColor.a,
+		};
+
+		m_Context->GetDeviceContext()->OMSetRenderTargets(1u, m_RenderTargetView.GetAddressOf(), nullptr);
+		m_Context->GetDeviceContext()->ClearRenderTargetView(m_RenderTargetView.Get(), color);
+	}
+
+	void dxFramebuffer::BindAsResource()
+	{
+		LT_ENGINE_ERROR("dxFramebuffer::BindAsResource: NO_IMPLEMENT");
+	}
+
+}	

Engine/src/Platform/GraphicsAPI/DirectX/dxFramebuffer.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "Base.h"
+#include "Graphics/Framebuffer.h"
+
+#include <d3d11.h>
+#include <wrl.h>
+
+namespace Light {
+	
+	class dxSharedContext;
+
+	class dxFramebuffer : public Framebuffer
+	{
+	private:
+		std::shared_ptr<dxSharedContext> m_Context;
+		
+		FramebufferSpecification m_Specification;
+
+		Microsoft::WRL::ComPtr<ID3D11RenderTargetView> m_RenderTargetView;
+		Microsoft::WRL::ComPtr<ID3D11Texture2D> m_ColorAttachment;
+		Microsoft::WRL::ComPtr<ID3D11Texture2D> m_DepthStencilAttachment;
+		Microsoft::WRL::ComPtr<ID3D11ShaderResourceView> m_ResourceView;
+		Microsoft::WRL::ComPtr<ID3D11DepthStencilView> m_DepthStencilView;
+
+	public:
+		dxFramebuffer(const FramebufferSpecification& specification, std::shared_ptr<dxSharedContext> sharedContext);
+
+		inline void* GetColorAttachment() override { return (void*)m_ResourceView.Get(); }
+
+		void BindAsTarget() override;
+		void BindAsResource() override;
+
+	};
+
+}

Engine/src/Platform/GraphicsAPI/DirectX/dxRenderCommand.cpp

@@ -28,7 +28,7 @@ namespace Light {
 
 	void dxRenderCommand::ClearBackBuffer()
 	{
-		float colors[] = { 1.2f, 0.4f, 0.9f, 1.0f }; // #todo: use a variable for this
+		float colors[] = { 0.1, 0.35f, 0.46f, 1.0f }; // #todo: use a local variable for this
 		m_Context->GetDeviceContext()->ClearRenderTargetView(m_Context->GetRenderTargetView().Get(), colors);
 	}
 
@@ -42,6 +42,11 @@ namespace Light {
 		m_Context->GetDeviceContext()->DrawIndexed(count, 0u, 0u);
 	}
 
+	void dxRenderCommand::DefaultTargetFramebuffer()
+	{
+		m_Context->GetDeviceContext()->OMSetRenderTargets(1, m_Context->GetRenderTargetView().GetAddressOf(), nullptr);
+	}
+
 	void dxRenderCommand::SetViewport(unsigned int x, unsigned int y, unsigned int width, unsigned int height)
 	{
 		// create viewport

Engine/src/Platform/GraphicsAPI/DirectX/dxRenderCommand.h

@@ -24,6 +24,8 @@ namespace Light {
 		virtual void Draw(unsigned int count) override;
 		virtual void DrawIndexed(unsigned int count) override;
 
+		virtual void DefaultTargetFramebuffer() override;
+
 		virtual void SetViewport(unsigned int x, unsigned int y, unsigned int width, unsigned int height) override;
 	};
 

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

@@ -0,0 +1,52 @@
+#include "ltpch.h"
+#include "glFramebuffer.h"
+
+#include <glad/glad.h>
+
+namespace Light {
+
+	glFramebuffer::glFramebuffer(const FramebufferSpecification& specification)
+		: m_Specification(specification)
+	{
+		glCreateFramebuffers(1, &m_BufferID);
+		glBindFramebuffer(GL_FRAMEBUFFER, m_BufferID);
+
+		// create color attachment
+		glCreateTextures(GL_TEXTURE_2D, 1, &m_ColorAttachment);
+		glBindTexture(GL_TEXTURE_2D, m_ColorAttachment);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, m_Specification.width, m_Specification.height, NULL, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+		glTextureParameteri(m_ColorAttachment, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTextureParameteri(m_ColorAttachment, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_ColorAttachment, 0);
+
+		// glTextureStorage2D(m_ColorAttachment, 0, GL_RGBA8, m_Specification.width, m_Specification.height);
+
+	//	glCreateTextures(GL_TEXTURE_2D, 1, &m_DepthStencilAttachment);
+	//	glBindTexture(GL_TEXTURE_2D, m_DepthStencilAttachment);
+	//	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, m_Specification.width, m_Specification.height, NULL, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, nullptr);
+	//	// glTextureStorage2D(m_DepthStencilAttachment, 0, GL_DEPTH24_STENCIL8, m_Specification.width, m_Specification.height);
+	//	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, m_DepthStencilAttachment, 0);
+
+		LT_ENGINE_ASSERT((glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE), "glFramebuffer::Validate: framebuffer is incomplete");
+
+		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	}
+
+	glFramebuffer::~glFramebuffer()
+	{
+		glDeleteFramebuffers(1, &m_BufferID);
+	}
+
+	void glFramebuffer::BindAsTarget()
+	{
+		glBindFramebuffer(GL_FRAMEBUFFER, m_BufferID);
+		glClearColor(m_Specification.defaultColor.r, m_Specification.defaultColor.g, m_Specification.defaultColor.b, m_Specification.defaultColor.a);
+		glClear(GL_COLOR_BUFFER_BIT);
+	}
+
+	void glFramebuffer::BindAsResource()
+	{
+		LT_ENGINE_ERROR("glFramebuffer::BindAsResource: NO_IMPLEMENT!");
+	}
+
+}

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

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "Base.h"
+#include "Graphics/Framebuffer.h"
+
+namespace Light {
+
+	class glFramebuffer : public Framebuffer
+	{
+	private:
+		FramebufferSpecification m_Specification;
+
+		unsigned int m_BufferID, m_ColorAttachment, m_DepthStencilAttachment;
+
+	public:
+		glFramebuffer(const FramebufferSpecification& specification);
+		~glFramebuffer();
+
+		inline void* GetColorAttachment() override { return (void*)m_ColorAttachment; }
+
+		void BindAsTarget() override;
+		void BindAsResource() override;
+	};
+
+}

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

@@ -17,8 +17,8 @@ namespace Light {
 
 	void glRenderCommand::ClearBackBuffer()
 	{
-		glClear(GL_COLOR_BUFFER_BIT);
 		glClearColor(0.25f, 0.45f, 0.91f, 1.0f); // #todo: use a variable for this
+		glClear(GL_COLOR_BUFFER_BIT);
 	}
 
 	void glRenderCommand::Draw(unsigned int count)
@@ -31,6 +31,11 @@ namespace Light {
 		glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, nullptr);
 	}
 
+	void glRenderCommand::DefaultTargetFramebuffer()
+	{
+		glBindFramebuffer(GL_FRAMEBUFFER, NULL);
+	}
+
 	void glRenderCommand::SetViewport(unsigned int x, unsigned int y, unsigned int width, unsigned int height)
 	{
 		glViewport(x, y, width, height);

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

@@ -19,6 +19,8 @@ namespace Light {
 		void Draw(unsigned int count) override;
 		void DrawIndexed(unsigned int count) override;
 
+		virtual void DefaultTargetFramebuffer() override;
+
 		virtual void SetViewport(unsigned int x, unsigned int y, unsigned int width, unsigned int height) override;
 	};