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Kaliber

A simple, cross-platform 2D game engine with OpenGL and Vulkan renderers. Supports Linux, Windows and Android platforms. This is a personal hobby project. I've published a little game on Google Play based on this engine. Full game code and assets are included in this repository.

Pre-requisites:

GN build system is required for all platforms:
https://gn.googlesource.com/gn/

Building from the command-line:

All platforms except Android:

Setup:

Generate build files for Ninja in release and debug modes.

gn gen out/release
gn gen --args='is_debug=true' out/debug

Building and running:

Build all games in release mode and run "hello_world".

ninja -C out/release
./out/release/hello_world

Build only "demo" in debug mode and run.

ninja -C out/debug demo
./out/debug/demo

Android:

Build the default game ("hello_world") in debug mode for all ABIs and install. GN will be run by Gradle so no setup is required. Both Linux and Windows are supported as host platforms. The Gradle project can also be opened in Android Studio.

cd build/android
./gradlew :app:installDebug

Build in release mode. The generated APK must be signed before installing.

./gradlew :app:assembleRelease

Build configuration can be changed via project properties. The following command will build "demo" in debug mode for x86_64 ABI and install. "targetArchs" property can be set to any combination of Arm7, Arm8, X86_64, X86. Location of gn and ninja executables can also be specified via "gn" and "ninja" properties.

./gradlew :app:installDebug -PtargetArchs="X86_64" -PtargetGame="demo"

Generate Visual Studio solution:

gn.exe gen --args="is_debug=true" --ide=vs2022 out\vs
devenv out\vs\all.sln

Third-party libraries:

glew, jsoncpp, minimp3, oboe, stb, texture-compressor, minizip, glslang, spirv-reflect, vma, vulkan-sdk, volk

Hello World example:

Shows a smoothly rotating "Hello World!".

class HelloWorld final : public eng::Game {
 public:
  ~HelloWorld() final = default;

  bool Initialize() final {
    eng::Engine::Get().SetImageSource(
        "hello_world_image",
        std::bind(&eng::Engine::Print, &eng::Engine::Get(), "Hello World!",
                  base::Vector4f(1, 1, 1, 0)));

    hello_world_.Create("hello_world_image").SetVisible(true);
    animator_.Attach(&hello_world_);
    animator_.SetRotation(base::PI2f, 3,
                          std::bind(base::SmootherStep, std::placeholders::_1));
    animator_.Play(eng::Animator::kRotation, true);
    return true;
  }

 private:
  eng::ImageQuad hello_world_;
  eng::Animator animator_;
};

GAME_FACTORIES{GAME_CLASS(HelloWorld)};

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