Add cmake support

.editorconfig

@@ -9,7 +9,7 @@ insert_final_newline = true
 max_line_length = 120
 trim_trailing_whitespace = true
 
-[{*.py,SConstruct,SCsub}]
+[*.py]
 indent_style = space
 
 [{*.{yml,yaml},.clang{-format,-tidy,d}}]

.github/actions/openvic-build/action.yml

@@ -1,30 +1,18 @@
 name: Build OpenVic
-description: Setup and Build OpenVic with the provided options
+description: Configure, build, and install OpenVic with CMake
 
 inputs:
   identifier:
-    description: Identifier of this build
-  target:
-    description: Target type to build for
+    description: Identifier of this build (artifact name)
+  preset:
+    description: CMake configure preset
     required: true
-  platform:
-    description: Platform to build for
+  configuration:
+    description: Build configuration (Debug, Release, RelWithDebInfo)
     required: true
-  arch:
-    description: Architecture to build for
-    required: true
-  api-version:
-    description: API version to build for
-    required: true
-  scons-flags:
-    description: Additional flags to send to SCons
+  cmake-args:
+    description: Additional -D flags passed to the CMake configure step
     default: ''
-  cache-base-branch:
-    description: Branch to base the cache upon
-    default: 'master'
-  disable-cache:
-    description: Whether to disable the build cache
-    default: 'false'
   tag-name:
     description: Name of tag
     default: ''
@@ -35,34 +23,40 @@ inputs:
 runs:
   using: composite
   steps:
-    - name: Setup build cache
-      uses: OpenVicProject/openvic-cache@master
-      if: ${{ inputs.disable-cache != 'true' }}
-      with:
-        cache-name: ${{ inputs.identifier }}
-        base-branch: ${{ inputs.cache-base-branch }}
-      continue-on-error: true
-
-    - name: Set up Python
-      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-      with:
-        python-version: "3.x"
+    - name: Setup MSVC environment
+      if: ${{ runner.os == 'Windows' }}
+      shell: pwsh
+      run: |
+        $vswhere = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
+        $vsPath = & $vswhere -latest -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
+        Import-Module (Join-Path $vsPath "Common7\Tools\Microsoft.VisualStudio.DevShell.dll")
+        Enter-VsDevShell -VsInstallPath $vsPath -SkipAutomaticLocation -DevCmdArguments '-arch=x64 -host_arch=x64'
+        Get-ChildItem env: | ForEach-Object { Add-Content -Path $env:GITHUB_ENV -Value "$($_.Name)=$($_.Value)" }
 
-    - name: Set up SCons
+    - name: Setup Ninja
       shell: bash
       run: |
-        python -c "import sys; print(sys.version)"
-        python -m pip install scons
-        scons --version
+        # Ninja is preinstalled on GitHub-hosted images; fall back to the
+        # image's package manager if a future image drops it.
+        if ! command -v ninja >/dev/null 2>&1; then
+          if [ "$RUNNER_OS" = "macOS" ]; then
+            brew install ninja
+          elif [ "$RUNNER_OS" = "Windows" ]; then
+            choco install ninja -y
+          else
+            sudo apt-get update -y && sudo apt-get install -y ninja-build
+          fi
+        fi
+        ninja --version
 
     - name: Install APT dependencies
-      if: ${{ inputs.platform == 'linux' }}
+      if: ${{ runner.os == 'Linux' }}
       uses: awalsh128/cache-apt-pkgs-action@681749ae568c81c2037cb9185e38b709b261bd2f # v1.6.1
       with:
         packages: build-essential pkg-config libtbb-dev
 
     - name: Install and Set g++ to version 13
-      if: ${{ inputs.platform == 'linux' }}
+      if: ${{ runner.os == 'Linux' }}
       shell: sh
       run: |
         g++ --version
@@ -73,26 +67,23 @@ runs:
         sudo update-alternatives --set g++ /usr/bin/g++-13
         g++ --version
 
-    - name: Setup MinGW for Windows/MinGW build
-      if: ${{ inputs.platform == 'windows' }}
-      uses: egor-tensin/setup-mingw@ef0952fadae6794e225c0c1654887408bcadbf64
-
-    - name: Compile with SCons
-      uses: OpenVicProject/openvic-build@master
+    - name: Configure
+      shell: bash
       env:
-        GAME_TAG: ${{ inputs.tag-name }}
-        GAME_RELEASE: ${{ inputs.release-name }}
-      with:
-        platform: ${{ inputs.platform }}
-        target: ${{ inputs.target }}
-        bin-dir: "game/bin/"
-        sconsflags: arch=${{ inputs.arch }} api_version=${{ inputs.api-version }} ${{ inputs.scons-flags }}
-
-    - name: Delete compilation files
-      if: ${{ inputs.platform == 'windows' }}
-      shell: pwsh
+        # Baked into the commit-info header at configure time.
+        OPENVIC_TAG: ${{ inputs.tag-name }}
+        OPENVIC_RELEASE: ${{ inputs.release-name }}
       run: |
-        Remove-Item game/bin/openvic/* -Include *.exp,*.lib,*.pdb -Force
+        cmake --preset ${{ inputs.preset }} \
+          ${{ inputs.cmake-args }}
+
+    - name: Build
+      shell: bash
+      run: cmake --build out/build/${{ inputs.preset }} --config ${{ inputs.configuration }}
+
+    - name: Install
+      shell: bash
+      run: cmake --install out/build/${{ inputs.preset }} --config ${{ inputs.configuration }}
 
     - name: Upload extension artifact
       uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1

.github/changed-files.yml

@@ -4,23 +4,23 @@ everything: &everything
   - "**"
 
 # Determines if build actions should occur after static checks are ran. Broadly speaking, these
-#  files changing would result in SCons rebuilding the engine, or are otherwise pertinent to the
+#  files changing would result in CMake rebuilding, or are otherwise pertinent to the
 #  buildsystem itself.
 sources:
   - .github/{actions/*,workflows}/*.yml
-  - "**/{SConstruct,SCsub,*.py}"
+  - "**/CMakeLists.txt"
+  - "**/*.cmake"
+  - "**/CMakePresets.json"
+  - "**/*.py"
   - "**/*.{hpp,cpp,inc,gd,tscn,scn,tres,res}"
   - "**/*.{cfg,godot,gdextension,uid,import}"
   - "**/*.{svg,ico,icns,png,ogv,ogg,mp3,csv,xml}"
-  - scripts
-  - godot-cpp
   - extension/deps/**
 
 pre-commit:
   - *everything
-  - '!scripts/**'
-  - '!godot-cpp/**'
-  - '!extension/deps/*/**'
+  # The first-party submodule (openvic-simulation) runs its own checks.
+  - '!extension/deps/openvic-simulation/**'
 
 # Determines which files are appropriate for running clangd-tidy checks on.
 clangd:

.github/workflows/build-matrix.yml

@@ -2,15 +2,7 @@ name: 🔢 Build Matrix
 
 on:
   workflow_call:
-    inputs:
-      godot-api-version:
-        type: string
-        required: true
   workflow_dispatch:
-    inputs:
-      godot-api-version:
-        type: string
-        required: true
 
 jobs:
   build-matrix:
@@ -25,44 +17,56 @@ jobs:
           - identifier: windows-debug
             os: windows-latest
             name: 🏁 Windows Debug
-            target: template_debug
-            platform: windows
-            arch: x86_64
+            preset: windows-x64-template_debug
+            configuration: Debug
 
           - identifier: windows-release
             os: windows-latest
             name: 🏁 Windows Release
-            target: template_release
-            platform: windows
-            arch: x86_64
+            preset: windows-x64-template_release
+            configuration: Release
+
+          - identifier: windows-editor
+            os: windows-latest
+            name: 🏁 Windows Editor
+            preset: windows-x64-editor
+            configuration: RelWithDebInfo
 
           - identifier: macos-debug
             os: macos-latest
             name: 🍎 macOS (universal) Debug
-            target: template_debug
-            platform: macos
-            arch: universal
+            preset: macos-universal-template_debug
+            configuration: Debug
 
           - identifier: macos-release
             os: macos-latest
             name: 🍎 macOS (universal) Release
-            target: template_release
-            platform: macos
-            arch: universal
+            preset: macos-universal-template_release
+            configuration: Release
+
+          - identifier: macos-editor
+            os: macos-latest
+            name: 🍎 macOS (universal) Editor
+            preset: macos-universal-editor
+            configuration: RelWithDebInfo
 
           - identifier: linux-debug
             os: ubuntu-22.04
             name: 🐧 Linux Debug
-            target: template_debug
-            platform: linux
-            arch: x86_64
+            preset: linux-x64-template_debug
+            configuration: Debug
 
           - identifier: linux-release
             os: ubuntu-22.04
             name: 🐧 Linux Release
-            target: template_release
-            platform: linux
-            arch: x86_64
+            preset: linux-x64-template_release
+            configuration: Release
+
+          - identifier: linux-editor
+            os: ubuntu-22.04
+            name: 🐧 Linux Editor
+            preset: linux-x64-editor
+            configuration: RelWithDebInfo
 
     steps:
       - name: Checkout project
@@ -75,7 +79,5 @@ jobs:
         uses: ./.github/actions/openvic-build
         with:
           identifier: ${{ matrix.identifier }}
-          target: ${{ matrix.target }}
-          platform: ${{ matrix.platform }}
-          arch: ${{ matrix.arch }}
-          api-version: ${{ inputs.godot-api-version }}
+          preset: ${{ matrix.preset }}
+          configuration: ${{ matrix.configuration }}

.github/workflows/builds.yml

@@ -23,7 +23,6 @@ jobs:
       sources-changed: ${{ steps.changed-files.outputs.sources_any_changed }}
       godot-executable-url: ${{ steps.godot-env.outputs.godot-linux-url }}
       godot-templates-url: ${{ steps.godot-env.outputs.godot-template-url }}
-      godot-api-version: ${{ steps.godot-env.outputs.godot-api-version }}
     steps:
       - name: Checkout project
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
@@ -68,8 +67,6 @@ jobs:
     permissions:
       contents: read
     uses: ./.github/workflows/build-matrix.yml
-    with:
-      godot-api-version: ${{ needs.static-checks-builds.outputs.godot-api-version }}
 
   godot-debug-checks:
     runs-on: ubuntu-latest

.github/workflows/nightly-releases.yml

@@ -24,7 +24,6 @@ jobs:
       commit: ${{ steps.check_for_new_commits.outputs.commit }}
       godot-executable-url: ${{ steps.godot-env.outputs.godot-linux-url }}
       godot-templates-url: ${{ steps.godot-env.outputs.godot-template-url }}
-      godot-api-version: ${{ steps.godot-env.outputs.godot-api-version }}
       latest-tag: ${{ steps.default-values.outputs.latest-tag || steps.master-values.outputs.latest-tag || steps.nightly-values.outputs.latest-tag }}
       commit-hash: ${{ steps.default-values.outputs.commit-hash || steps.master-values.outputs.commit-hash || steps.nightly-values.outputs.commit-hash }}
       from-ref: ${{ steps.default-values.outputs.from-ref || steps.master-values.outputs.from-ref || steps.nightly-values.outputs.from-ref }}
@@ -100,15 +99,14 @@ jobs:
         run: |
           relevant_files=(
             "extension/deps/*"
-            "scripts"
-            "godot-cpp"
             "extension/src/*.hpp"
             "extension/src/*.cpp"
             "game/*"
             ':!extension/src/openvic-extension/pch.hpp'
             ':!extension/src/openvic-extension/pch.cpp'
             "pyproject.toml"
-            "SConstruct"
+            "CMakeLists.txt"
+            "CMakePresets.json"
             ".github/workflows/builds.yml"
             ".github/actions/openvic-build/action.yml"
             ".github/actions/openvic-release/action.yml"
@@ -227,39 +225,37 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          # RelWithDebInfo = optimized with debug symbols (the old
+          # optimize=speed_trace debug_symbols=yes flavor).
           - identifier: windows-release
             os: windows-latest
             name: 🏁 Windows Release
-            target: template_release
-            platform: windows
-            arch: x86_64
-            scons-flags: optimize=speed_trace
+            preset: windows-x64-template_release
+            configuration: RelWithDebInfo
+            cmake-args: ''
 
           - identifier: macos-release
             os: macos-latest
             name: 🍎 macOS (universal) Release
-            target: template_release
-            platform: macos
-            arch: universal
-            scons-flags: "optimize=speed_trace lto=full"
+            preset: macos-universal-template_release
+            configuration: RelWithDebInfo
+            cmake-args: -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON
 
           - identifier: linux-release
             os: ubuntu-latest
             name: 🐧 Linux Release
             runner: ubuntu-22.04
-            target: template_release
-            platform: linux
-            arch: x86_64
-            scons-flags: "optimize=speed_trace lto=full use_static_cpp=yes"
+            preset: linux-x64-template_release
+            configuration: RelWithDebInfo
+            cmake-args: -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON
 
           - identifier: linux-debug
             os: ubuntu-latest
             name: 🐧 Linux Debug
             runner: ubuntu-latest
-            target: template_debug
-            platform: linux
-            arch: x86_64
-            scons-flags: optimize=none
+            preset: linux-x64-template_debug
+            configuration: Debug
+            cmake-args: ''
 
     steps:
       - name: Checkout project
@@ -272,13 +268,10 @@ jobs:
         uses: ./.github/actions/openvic-build
         with:
           identifier: ${{ matrix.identifier }}
-          target: ${{ matrix.target }}
-          platform: ${{ matrix.platform }}
-          arch: ${{ matrix.arch }}
-          api-version: ${{ needs.nightly-check.outputs.godot-api-version }}
+          preset: ${{ matrix.preset }}
+          configuration: ${{ matrix.configuration }}
           tag-name: ${{ needs.nightly-check.outputs.tag-name }}
-          disable-cache: true
-          scons-flags: use_hot_reload=no debug_symbols=yes ${{ matrix.scons-flags }}
+          cmake-args: ${{ matrix.cmake-args }}
 
   publish-nightly-release:
     name: Publish Release