Skylark Build System

This repository now uses a target-oriented CMake layout with optional backend modules and vcpkg manifest integration.

What changed

• Replaced recursive, catch-all module globbing with explicit target definitions.
• Split the portable modern graph from the legacy SKEngine2 path.
• Added platform compile definitions at the project interface layer.
• Added optional backend toggles for D3D11, D3D12, OpenGL, and Vulkan.
• Added install/export rules so Skylark libraries can be consumed as exported CMake targets.
• Added vcpkg.json and CMakePresets.json for reproducible Windows/Linux workflows.
• Added an optional smoke test executable (SkylarkSmoke) to verify the link graph.

CI

• skylark-ci default matrix only covers the portable/stable lanes that are expected to stay green on GitHub-hosted runners: linux-debug and windows-msvc-debug.
• Backend-specific jobs such as windows-d3d11-debug are kept in the same workflow under the experimental-backends job and run on workflow_dispatch, so backend bring-up does not block the main repository health signal.

Build requirements

• CMake 3.23 or newer
• A C++20-capable compiler
• Ninja recommended
• vcpkg recommended for dependency-managed builds

vcpkg setup

Set VCPKG_ROOT before using the vcpkg presets.

Linux

export VCPKG_ROOT=/path/to/vcpkg
cmake --preset linux-debug
cmake --build --preset linux-debug

Windows

$env:VCPKG_ROOT="C:\dev\vcpkg"
cmake --preset windows-msvc
cmake --build --preset windows-msvc-debug

Presets

Bootstrap presets without a vcpkg toolchain:

• dev-linux-debug
• dev-linux-release

vcpkg-backed Linux presets:

• linux-debug
• linux-release
• linux-vulkan-debug
• linux-opengl-debug

vcpkg-backed Windows presets:

• windows-msvc
• windows-d3d11
• windows-d3d12
• windows-opengl
• windows-vulkan

Backend options

• SK_ENABLE_D3D11
• SK_ENABLE_D3D12
• SK_ENABLE_OPENGL
• SK_ENABLE_VULKAN
• SK_BUILD_LEGACY
• SK_BUILD_SMOKE_TEST

The default configuration is intentionally conservative: portable modern modules are enabled, legacy SKEngine2 is disabled, and graphics backends are opt-in.