Atlas Engine

Realtime Sponza scene with software raytraced GI, AO and reflections (model from Intel Graphics Research Sample Library)

Introduction

This is a cross platform toy engine developed in my spare time that is available on Linux and Windows.

Requirements

• OpenGL 4.6
• C++17 compatible compiler
• CMake
• Vcpkg

Set up

Dependencies are managed through vcpkg. You can either install the packages manually or while doing the build configuration with CMake. To use vcpkg together with CMake follow the steps described here.

Compiling the demo application

Run CMake with the option ATLAS_DEMO=ON to include the demo application in the project. For easier use, the vsbuild.bat does exactly that and launches Visual Studio afterwards. After launching the IDE, set AtlasEngineDemo as your target.

Note: In order to start the application properly you might need to change the asset directory in the demo source file.

Including the library into your own project

It is possible to compile the engine either as a shared or static library. Set the ATLAS_BUILD_SHARED option accordingly. To make the library work with its dependencies, the root CMakeLists.txt of this repository has to be added as a subdirectory. As an entry point to create an application from scratch take a look at the Hello World tutorial. For reference, the source folder contains an empty app header and an empty app source.

CMake build options

• ATLAS_BUILD_SHARED Force project to be build as a shared library
• ATLAS_EXPORT_MAIN Export the main file to be added as executable to parent project (only if main function cannot be found)
• ATLAS_NO_APP Disables the engines main function and app functionality. You have to code the main function and initialize the engine yourself
• ATLAS_IMGUI Enables the ImGui integration. Is enabled by default if the demo project is build.
• ATLAS_ASSIMP Enables the Assimp integration. Is enabled by default.

Documentation

If you want more information have a look into the Documentation.

License

The source code is licensed under the MIT license. The copyright notices of the dependencies can be found in the LICENSE.md file in the dependency directory.

Note: The files in the data folder (except the shaders) use a different license.

Code Example

For a code example have a look at the demo application.

Screenshots

Rasterized image using real time global illumination
Path traced scene
Island demo scene using the terrain and ocean systems