Batch Rendering & IndexBuffers & RendererProgram

Engine/src/Engine/Base.h

@@ -25,4 +25,3 @@
 
 #define LT_ENGINE_ASSERT(x, ...) { if(!(x)) { LT_ENGINE_CRITICAL(__VA_ARGS__); __debugbreak(); } }
 #define LT_CLIENT_ASSERT(x, ...) { if(!(x)) { LT_CLIENT_CRITICAL(__VA_ARGS__); __debugbreak(); } }
-

Engine/src/Engine/Core/Application.cpp

@@ -41,7 +41,9 @@ namespace Light {
 			m_Window->PollEvents();
 
 			// Rendering
-			m_Window->GetGfxContext()->GetRenderer()->Draw();
+			m_Window->GetGfxContext()->GetRenderer()->BeginScene();
+			m_LayerStack.OnRender();
+			m_Window->GetGfxContext()->GetRenderer()->EndScene();
 
 			// Buffer updates
 			m_Window->GetGfxContext()->GetRenderCommand()->SwapBuffers();

Engine/src/Engine/Graphics/Buffers.cpp

@@ -27,12 +27,15 @@ namespace Light {
 		}
 	}
 
-	IndexBuffer* IndexBuffer::Create(unsigned int count, unsigned int* indices)
+	IndexBuffer* IndexBuffer::Create(unsigned int count, unsigned int* indices, void* sharedContext)
 	{
 		switch (GraphicsContext::GetGraphicsAPI())
 		{
 		case GraphicsAPI::OpenGL:
 			return new glIndexBuffer(count, indices);
+		case GraphicsAPI::DirectX: LT_WIN(
+			return new dxIndexBuffer(count, indices, sharedContext);
+		)
 		default:
 			LT_ENGINE_ASSERT(false, "IndexBuffer::Create: invalid/unsupported GraphicsAPI {}", GraphicsContext::GetGraphicsAPI());
 			return nullptr;

Engine/src/Engine/Graphics/Buffers.h

@@ -9,6 +9,9 @@ namespace Light {
 	public:
 		static VertexBuffer* Create(unsigned int stride, unsigned int count, float* vertices, void* sharedContext);
 
+		virtual void* Map() = 0;
+		virtual void UnMap() = 0;
+
 		virtual void Bind() = 0;
 		virtual void UnBind() = 0;
 
@@ -19,7 +22,7 @@ namespace Light {
 	class IndexBuffer
 	{
 	public:
-		static IndexBuffer* Create(unsigned int count, unsigned int* indices);
+		static IndexBuffer* Create(unsigned int count, unsigned int* indices, void* sharedContext);
 
 		virtual void Bind() = 0;
 		virtual void UnBind() = 0;

Engine/src/Engine/Graphics/Renderer.cpp

@@ -7,24 +7,36 @@
 
 namespace Light {
 
-	Renderer* Renderer::m_Context;
+	Renderer* Renderer::s_Context;
 
 	Renderer::Renderer(std::shared_ptr<RenderCommand> renderCommand, void* sharedContext)
 		: m_RenderCommand(renderCommand), m_SharedContext(sharedContext)
 	{
-		m_Context = this;
+		s_Context = this;
 
-		m_Shader = std::unique_ptr<Shader>(Shader::Create("res/vertex.vertex", "res/fragment.fragment", m_SharedContext));
+		// QUADRENDERER //
+		unsigned int offset = 0;
+		unsigned int* indices = new unsigned int[LT_MAX_QUAD * 6];
 
-		float vertices[] =
+		for (int i = 0; i < LT_MAX_QUAD * 6; i += 6)
 		{
-			 0.0f,  0.5f, 0.0f, 0.0f, 1.0f, 1.0f,
+			indices[i + 0] = offset + 0;
-			 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f,
+			indices[i + 1] = offset + 1;
-			-0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f,
+			indices[i + 2] = offset + 2;
-		};
 
-		m_VertexBuffer = std::unique_ptr<VertexBuffer>(VertexBuffer::Create(6 * sizeof(float), (2 + 4) * 3, vertices, m_SharedContext));
+			indices[i + 3] = offset + 2;
-		m_VertexLayout = std::unique_ptr<VertexLayout>(VertexLayout::Create(m_VertexBuffer.get(), m_Shader.get(), { { "POSITION", VertexElementType::Float2 },{ "COLOR", VertexElementType::Float4 } }, m_SharedContext));
+			indices[i + 4] = offset + 3;
+			indices[i + 5] = offset + 0;
+
+			offset += 4;
+		}
+
+		m_QuadRenderer.shader = std::unique_ptr<Shader>(Shader::Create("res/vertex.vertex", "res/fragment.fragment", m_SharedContext));
+		m_QuadRenderer.vertexBuffer = std::unique_ptr<VertexBuffer>(VertexBuffer::Create(sizeof(QuadRendererProgram::QuadVertexData), LT_MAX_QUAD * 4, nullptr, m_SharedContext));
+		m_QuadRenderer.vertexLayout = std::unique_ptr<VertexLayout>(VertexLayout::Create(m_QuadRenderer.vertexBuffer.get(), m_QuadRenderer.shader.get(), { { "POSITION", VertexElementType::Float3 },{ "COLOR", VertexElementType::Float4 } }, m_SharedContext));
+		m_QuadRenderer.indexBuffer = std::unique_ptr<IndexBuffer>(IndexBuffer::Create(LT_MAX_QUAD * 6, indices, m_SharedContext));
+		delete[] indices;
+		// QUADRENDERER //
 	}
 
 	Renderer* Renderer::Create(std::shared_ptr<RenderCommand> renderCommand, void* sharedContext)
@@ -32,14 +44,63 @@ namespace Light {
 		return new Renderer(renderCommand, sharedContext);
 	}
 
-	void Renderer::Draw()
+	void Renderer::DrawQuad(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint)
 	{
-		m_Shader->Bind();
+		s_Context->DrawQuadImpl(position, size, tint);
-		m_VertexBuffer->Bind();
+	}
-		m_VertexLayout->Bind();
 
-		m_RenderCommand->Draw(3u);
+	void Renderer::DrawQuadImpl(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint)
+	{
+		// check
+		if (m_QuadRenderer.mapCurrent + 4 >= m_QuadRenderer.mapEnd)
+		{
+			LT_ENGINE_WARN("Render::DrawQuad: max calls per frame exceeded the limit: {}", LT_MAX_QUAD);
+
+			EndScene();
+			m_QuadRenderer.Map();
+		}
+
+		// local
+		const float xMin = position.x;
+		const float yMin = position.y;
+		const float xMax = position.x + size.x;
+		const float yMax = position.y + size.y;
+
+		// TOP LEFT
+		m_QuadRenderer.mapCurrent->position = { xMin, yMin, position.z };
+		m_QuadRenderer.mapCurrent->tint = glm::vec4(1.0f, 0.1f, 0.1f, 1.0f);
+		m_QuadRenderer.mapCurrent++;
+
+		// TOP RIGHT
+		m_QuadRenderer.mapCurrent->position = { xMax, yMin, position.z };
+		m_QuadRenderer.mapCurrent->tint = glm::vec4(0.1f, 1.0f, 0.1f, 1.0f);
+		m_QuadRenderer.mapCurrent++;
+
+		// BOTTOM RIGHT
+		m_QuadRenderer.mapCurrent->position = { xMax, yMax, position.z };
+		m_QuadRenderer.mapCurrent->tint = glm::vec4(0.3f, 0.3f, 0.3f, 1.0f);
+		m_QuadRenderer.mapCurrent++;
+
+		// BOTTOM LEFT
+		m_QuadRenderer.mapCurrent->position = { xMin, yMax, position.z };
+		m_QuadRenderer.mapCurrent->tint = glm::vec4(0.1f, 0.1f, 1.0f, 1.0f);
+		m_QuadRenderer.mapCurrent++;
+
+		// advance
+		m_QuadRenderer.quadCount++;
 	}
 
 
+	void Renderer::BeginScene()
+	{
+		m_QuadRenderer.Map();
+	}
+
+	void Renderer::EndScene()
+	{
+		m_QuadRenderer.Bind();
+		m_RenderCommand->DrawIndexed(m_QuadRenderer.quadCount * 6);
+		m_QuadRenderer.quadCount = 0;
+	}
+
 }

Engine/src/Engine/Graphics/Renderer.h

@@ -6,31 +6,80 @@
 #include "Buffers.h"
 #include "VertexLayout.h"
 
+#include <glm/glm.hpp>
+
 #include <memory>
 
+#define LT_MAX_QUAD 124
+
 namespace Light {
 
 	class RenderCommand;
 
+	struct RendererProgram
+	{
+		virtual void Map() = 0;
+		virtual void Bind() = 0;
+	};
+
 	class Renderer
 	{
 	private:
-		static Renderer* m_Context;
+		struct QuadRendererProgram : RendererProgram
+		{
+			// graphics context
+			std::shared_ptr<Shader> shader;
+			std::shared_ptr<VertexLayout> vertexLayout;
+			std::shared_ptr<VertexBuffer> vertexBuffer;
+			std::shared_ptr<IndexBuffer> indexBuffer;
+
+			// buffer data
+			struct QuadVertexData
+			{
+				glm::vec3 position;
+				glm::vec4 tint;
+			};
+
+			QuadVertexData* mapCurrent = nullptr;
+			QuadVertexData* mapEnd = nullptr;
+			unsigned int quadCount = 0u;
+
+			// functions
+			void Map()
+			{
+				mapCurrent = (QuadVertexData*)vertexBuffer->Map();
+				mapEnd = mapCurrent + LT_MAX_QUAD * 4;
+			}
+
+			void Bind()
+			{
+				vertexBuffer->UnMap();
+				shader->Bind();
+				vertexLayout->Bind();
+				vertexBuffer->Bind();
+				indexBuffer->Bind();
+			}
+		};
+
+		static Renderer* s_Context;
+
+		QuadRendererProgram m_QuadRenderer;
 
 		std::shared_ptr<RenderCommand> m_RenderCommand;
 
-		std::unique_ptr<Shader> m_Shader;
-		std::unique_ptr<VertexBuffer> m_VertexBuffer;
-		std::unique_ptr<VertexLayout> m_VertexLayout;
-
 		void* m_SharedContext;
 	public:
 		static Renderer* Create(std::shared_ptr<RenderCommand> renderCommand, void* sharedContext);
 		
-		void Draw();
+		static void DrawQuad(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint);
+
+		void BeginScene();
+		void EndScene();
 
 	private:
 		Renderer(std::shared_ptr<RenderCommand> renderCommand, void* sharedContext);
+
+		void DrawQuadImpl(const glm::vec3& position, const glm::vec2& size, const glm::vec4& tint);
 	};
 
 }

Engine/src/Engine/Layer/Layer.h

@@ -33,6 +33,8 @@ namespace Light {
 		virtual void OnUpdate(float deltaTime) {}
 		virtual void OnUserInterfaceUpdate() {}
 
+		virtual void OnRender() {}
+
 		// Mouse events
 		virtual bool OnMouseMoved(const MouseMovedEvent& event) { return false; }
 		virtual bool OnButtonPressed(const ButtonPressedEvent& event) { return false; }

Engine/src/Engine/Layer/LayerStack.cpp

@@ -35,6 +35,12 @@ namespace Light {
 			(*it)->OnUserInterfaceUpdate();
 	}
 
+	void LayerStack::OnRender()
+	{
+		for (auto it = m_Begin; it != m_End; it++)
+			(*it)->OnRender();
+	}
+
 	void LayerStack::OnEvent(const Event& event)
 	{
 		switch (event.GetEventType())

Engine/src/Engine/Layer/LayerStack.h

@@ -30,6 +30,8 @@ namespace Light {
 		void OnUpdate(float deltaTime);
 		void OnUserInterfaceUpdate();
 
+		void OnRender();
+
 		void OnEvent(const Event& event);
 
 		inline bool IsEmpty() { return m_Layers.empty(); }

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

@@ -17,8 +17,6 @@ namespace Light {
 		m_DeviceContext = dxContext->deviceContext;
 
 		D3D11_BUFFER_DESC desc = { 0 };
-		D3D11_SUBRESOURCE_DATA sd = { 0 };
-
 
 		desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
 		desc.Usage = D3D11_USAGE_DYNAMIC;
@@ -27,15 +25,24 @@ namespace Light {
 		desc.ByteWidth = count * stride;
 		desc.StructureByteStride = stride;
 
-		sd.pSysMem = vertices;
+		DXC(m_Device->CreateBuffer(&desc, nullptr, &m_Buffer));
-
-		DXC(m_Device->CreateBuffer(&desc, &sd, &m_Buffer));
 	}
 
 	dxVertexBuffer::~dxVertexBuffer()
 	{
 	}
 
+	void* dxVertexBuffer::Map()
+	{
+		m_DeviceContext->Map(m_Buffer.Get(), NULL, D3D11_MAP_WRITE_DISCARD, NULL, &m_Map);
+		return m_Map.pData;
+	}
+
+	void dxVertexBuffer::UnMap()
+	{
+		m_DeviceContext->Unmap(m_Buffer.Get(), NULL);
+	}
+
 	void dxVertexBuffer::Bind()
 	{
 		static const unsigned int offset = 0u;
@@ -46,4 +53,41 @@ namespace Light {
 	{
 	}
 
+
+	dxIndexBuffer::dxIndexBuffer(unsigned int count, unsigned int* indices, void* sharedContext)
+	{
+		HRESULT hr;
+
+		dxSharedContext* dxContext = static_cast<dxSharedContext*>(sharedContext);
+		LT_ENGINE_ASSERT(dxContext, "dxShader::dxShader: invalid dxContext");
+
+		m_Device = dxContext->device;
+		m_DeviceContext = dxContext->deviceContext;
+
+		D3D11_BUFFER_DESC bufferDesc = { 0 };
+		D3D11_SUBRESOURCE_DATA sd = { 0 };
+		bufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
+		bufferDesc.Usage = D3D11_USAGE_DEFAULT;
+
+		bufferDesc.ByteWidth = count * sizeof(unsigned int);
+		bufferDesc.StructureByteStride = sizeof(unsigned int);
+
+		sd.pSysMem = indices;
+
+		DXC(m_Device->CreateBuffer(&bufferDesc, &sd, &m_Buffer));
+	}
+
+	dxIndexBuffer::~dxIndexBuffer()
+	{
+	}
+
+	void dxIndexBuffer::Bind()
+	{
+		m_DeviceContext->IASetIndexBuffer(m_Buffer.Get(), DXGI_FORMAT_R32_UINT, 0u);
+	}
+
+	void dxIndexBuffer::UnBind()
+	{
+	}
+
 }

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

@@ -17,11 +17,31 @@ namespace Light {
 		Microsoft::WRL::ComPtr<ID3D11Device> m_Device;
 		Microsoft::WRL::ComPtr<ID3D11DeviceContext> m_DeviceContext;
 
+		D3D11_MAPPED_SUBRESOURCE m_Map;
+		
 		unsigned int m_Stride;
 	public:
 		dxVertexBuffer(unsigned int count, unsigned int stride, float* vertices, void* sharedContext);
 		~dxVertexBuffer();
 
+		void* Map() override;
+		void UnMap() override;
+
+		void Bind() override;
+		void UnBind() override;
+	};
+
+	class dxIndexBuffer : public IndexBuffer
+	{
+	private:
+		Microsoft::WRL::ComPtr<ID3D11Buffer> m_Buffer;
+
+		Microsoft::WRL::ComPtr<ID3D11Device> m_Device;
+		Microsoft::WRL::ComPtr<ID3D11DeviceContext> m_DeviceContext;
+	public:
+		dxIndexBuffer(unsigned int count, unsigned int* indices, void* sharedContext);
+		~dxIndexBuffer();
+
 		void Bind() override;
 		void UnBind() override;
 	};

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

@@ -8,8 +8,7 @@ namespace Light {
 	glVertexBuffer::glVertexBuffer(unsigned int count, float* vertices)
 	{
 		glCreateBuffers(1, &m_BufferID);
-		glBindBuffer(GL_ARRAY_BUFFER, m_BufferID);
+		glNamedBufferData(m_BufferID, count * sizeof(float), vertices, GL_DYNAMIC_DRAW);
-		glBufferData(GL_ARRAY_BUFFER, count * sizeof(float), vertices, GL_STATIC_DRAW);
 	}
 
 	glVertexBuffer::~glVertexBuffer()
@@ -17,6 +16,16 @@ namespace Light {
 		glDeleteBuffers(1, &m_BufferID);
 	}
 
+	void* glVertexBuffer::Map()
+	{
+		return glMapNamedBuffer(m_BufferID, GL_WRITE_ONLY);
+	}
+
+	void glVertexBuffer::UnMap()
+	{
+		glUnmapNamedBuffer(m_BufferID);
+	}
+
 	void glVertexBuffer::Bind()
 	{
 		glBindBuffer(GL_ARRAY_BUFFER, m_BufferID);
@@ -30,9 +39,7 @@ namespace Light {
 	glIndexBuffer::glIndexBuffer(unsigned int count, unsigned int* indices)
 	{
 		glCreateBuffers(1, &m_BufferID);
-		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_BufferID);
+		glNamedBufferData(m_BufferID, count * sizeof(unsigned int), indices, GL_STATIC_DRAW);
-		glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * sizeof(unsigned int), indices, GL_STATIC_DRAW);
-	
 	}
 
 	glIndexBuffer::~glIndexBuffer()

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

@@ -14,6 +14,9 @@ namespace Light {
 		glVertexBuffer(unsigned int count, float* vertices);
 		~glVertexBuffer();
 
+		void* Map() override;
+		void UnMap() override;
+
 		void Bind() override;
 		void UnBind() override;
 	};

Engine/src/Platform/OS/Windows/wWindow.cpp

@@ -28,7 +28,7 @@ namespace Light {
 		glfwSetWindowUserPointer(m_Handle, &m_EventCallback);
 		BindGlfwEvents();
 
-		m_GraphicsContext = std::unique_ptr<GraphicsContext>(GraphicsContext::Create(GraphicsAPI::DirectX, m_Handle));
+		m_GraphicsContext = std::unique_ptr<GraphicsContext>(GraphicsContext::Create(GraphicsAPI::OpenGL, m_Handle));
 		LT_ENGINE_ASSERT(m_GraphicsContext, "wWindow::wWindow: graphics context creation failed");
 	}
 

Sandbox/imgui.ini

@@ -4,8 +4,8 @@ Size=400,400
 Collapsed=0
 
 [Window][Dear ImGui Demo]
-Pos=-3,-1
+Pos=1,-3
-Size=244,247
+Size=405,290
 Collapsed=0
 
 [Window][Dear ImGui Metrics/Debugger]

Sandbox/res/fragment.fragment

@@ -1,4 +1,10 @@
-float4 main(float4 Color : COLOR) : SV_Target
+#version 440 core
+
+in vec4 fragColor;
+
+out vec4 FragmentColor;
+
+void main()
 {
-	return Color;
+	FragmentColor = fragColor;
 }

Sandbox/res/vertex.vertex

@@ -1,13 +1,12 @@
-struct VertexOut
+#version 440 core
-{
-	float4 Color : COLOR;
-	float4 Position : SV_Position;
-};
 
-VertexOut main(float2 InPosition : POSITION, float4 InColor : COLOR)
+layout(location = 0) in vec3 a_Position;
+layout(location = 1) in vec4 a_Color;
+
+out vec4 fragColor;
+
+void main()
 {
-	VertexOut vso;
+	gl_Position = vec4(a_Position, 1.0);
-	vso.Position = float4(InPosition.x, InPosition.y, 0.0f, 1.0f);
+	fragColor = a_Color;
-	vso.Color = InColor;
-	return vso;
 }

Sandbox/src/SandboxApp.cpp

@@ -1,7 +1,7 @@
 #define LIGHT_ENTRY_POINT
 #include <LightEngine.h>
 
-#include "SandboxLayer.h"
+	#include "SandboxLayer.h"
 
 class Sandbox : public Light::Application
 {

Sandbox/src/SandboxLayer.h

@@ -5,4 +5,9 @@ class SandboxLayer : public Light::Layer
 public:
 	SandboxLayer(const std::string& name): Light::Layer(name) {}
 
+	void OnRender() override
+	{
+		Light::Renderer::DrawQuad(glm::vec3(-0.5f, -0.5f, 0.0f), glm::vec2(1.f, 1.f), glm::vec4(1.12f, 1.41f, 1.72f, 1.0f));
+	}
+
 };