Little Engine Vulkan

A simple C++20 3D game engine using a customizable Vulkan renderer.

Documentation is located here (WIP).

Features

• window
  • Multi-platform windowing
    • Windows, Linux: via GLFW
  • Keyboard, mouse, and gamepad support
• graphics
  • Bootstrapped Vulkan render context
  • Customizable off-screen (forward) renderer
  • Multiple command buffers per frame
  • Customizable device selection
  • Deferred resource release
  • Async transfers
  • Shader reflection via SPIR-V Cross
  • Automatic pipeline creation
  • Per pipeline descriptor set lists
  • Stall-less API (including swapchain recreation)
  • sRGB and linear colour spaces
  • TrueType font support via dynamic texture atlases
• engine
  • Thread-safe AssetStore
    • Multi-reader single-writer API
    • Store any T associated with a Hash
    • Customizable asset loaders
    • Asset hot reload support: shaders, pipelines, textures implemented
  • Customizable Editor (via Dear ImGui)
  • Bitmap Fonts and 2D Text
  • GUI view/widget trees
  • Basic 3D AABB collision detection
• libs/*
  • Multi-threaded task scheduler
  • Archetypal entity-component framework
  • JSON parser, de/serializer
  • Formatted logger
• CMake install and find_package support

Limitations

• No dynamic library support on Windows
• Single render pass

Requirements

• CMake 3.14+
• Git
• C++20 compiler and stdlib (modules, coroutines, and ranges are not yet used)
• OS with desktop environment and Vulkan loader (libvulkan1.so / vulkan1.dll)
  • Windows 10
  • Linux: X, Wayland (untested), Raspberry Pi OS (64 bit bullseye+)
• GPU supporting Vulkan 1.0+, its driver, and loader
• Vulkan SDK / glslc (for compiling glsl shaders to SPIR-V in Debug, and validation layers)

Usage

LittleEngineVk (levk-engine) is a library intended to be built from source and linked statically, it currently does not support any installation / packaging. At present it ships with one hacked-together levk-demo application as an example, which will be split up and expanded upon in the future.

Building levk-demo

• Clone this repo (manually initializing git submodules is not required, it will be done during CMake configuration)
• Use CMake and a generator of your choice to configure an out-of-source build (build and out are ignored in git)
• If using CMake 3.20+ / Visual Studio in CMake mode / CMake Tools with VSCode, cmake/CMakePresets.json can be copied/symlinked to the project root for convenience
  • Use cmake --preset <name> to configure and cmake --build --preset <name> to build on the command line
  • VS CMake and VSCode CMake Tools should pick up the presets by themselves
  • The presets are not checked into the repo root since some IDEs/editors force its usage if present there
• For other scenarios, use CMake GUI or the command line to configure and generate a build
  • Command line: cmake -S . -B out && cmake --build out
  • If using an IDE generator, use CMake GUI to configure and generate a build, then open the project/solution in the IDE and build/debug as usual

External Dependencies

• {fmt}
• GLFW
• glm
• Dear ImGui
• PhysicsFS
• stb
• tiny-obj-loader
• VulkanHPP
• Vulkan Memory Allocator
• SPIR-V Cross
• freetype

CMake submodules

• ktl
• dtest

Original repository

LICENCE