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Dooms Engine ( Game Engine ) ( 2021.01.07 ~ )

Video

Game Engine Video

Features

Requirement

• C++17
• C# ( used for making engine tools )
• PC, Windows
• Target Compiler : MSVC, Clang ( clang is used for generating reflection data )

Engine Core

• Homemade Math Library ( JINMATH )
• Support SIMD ( Currently AVX2 ) ( Math, Culling.... )
• Asset Import Pipeline ( Automatically import assets located in asset folder )
• Component based System
• Object Management System for preventing memory leak ( 개발 일지 )
• Fast Runtime Type Casting ( writing manually type name is not required, reflection data is used. check reflection.h files ) ( time complexicity is always O(1), dynamic_cast isn't used ( RTTI option is disabled ), source code )
• Garbage Collector using reflection system ( stop-the-world, Mark ( multithread ) - Sweep algorithm, std::array, std::vector is also supported, nullify pointer referencing destroyed object ( to prvent referencing invalid address ), 개발 일지, video, soure code )

Rendering

• Supported Graphics API : OpenGL, DIRECTX 11 ( 80% )
• Deferred Rendering ( video )
• Sort objects from front to back
• Multi Thread ViewFrustum Culling From FrostBite Engine of EA Dice ( source code, 개발 일지 )
• Masked SW ( CPU ) Occlusion Culling From Intel ( video1, video2, source code, 개발 일지, reference paper
• Distance Culling from Unreal Engine ( reference, soure code )
• Shader Language Portable System ( Automatically convert glsl files to hlsl, glslcc is used )
• Shader Reflection System ( Provide shader variables data ( size, offset, variable name ... ) )
• Static Batch Rendering ( video, Mesh data of static objects with same material is combined automatically at start of scene. They are drawed in 1 draw call )

Physics

• Collision, Raycasting, Picking ( implemented with BVH Tree ) ( Picking Test Video, Collision Test Video )
• BVH, KDTree ( bvh source code, kdtree source code )

Reflection

• Automatic Reflection Data Generation System. ( video ) ( clrefelct_automation )
• Customized Reflection Open Source Library ( video ) ( Customized clReflect )
• Integrate imgui with reflection system. ( DObjects, std::vector, std::array, std::unique_ptr... is supported, video )

Misc

• JobSystem ( source code )

Currently working on

• Material Batching System ( Render objects with same material consecutively )
• Seperate main thread into rendering thread and game thread ( references : UE4 Threaded Rendering )
• implement physical based rendering ( https://cdn2.unrealengine.com/Resources/files/2013SiggraphPresentationsNotes-26915738.pdf )

To Develop

• completly support D3D11
• Dynamic Batch Rendering
• implement Hierarchical Shadow map
• implement Asset Redirect

Thirdparty Dependencies

• glfw : A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input
• assimp : The official Open-Asset-Importer-Library Repository
• DirectTex : DirectXTex texture processing library
• imgui : Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
• Intel TBB ( malloc proxy )
• concurrentqueue : A fast multi-producer, multi-consumer lock-free concurrent queue for C++11
• json : JSON for Modern C++
• glslcc : GLSL cross-compiler tool (GLSL->HLSL, MSL, GLES2, GLES3, GLSLv3), using SPIRV-cross and glslang
• magic_enum : Static reflection for enums (to string, from string, iteration) for modern C++
• googletest : Google Testing and Mocking Framework

Development Blog

Korean Blog