From 361276fd08c5a066145eea1ad23ccadbda118a70 Mon Sep 17 00:00:00 2001
From: briaguya <70942617+briaguya0@users.noreply.github.com>
Date: Thu, 30 Jul 2026 14:11:47 -0400
Subject: Use our own vcpkg root on Windows instead of the runner's (#240)

---
 .github/workflows/windows_build.yml | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/windows_build.yml b/.github/workflows/windows_build.yml
index 3daccd3..4819b62 100644
--- a/.github/workflows/windows_build.yml
+++ b/.github/workflows/windows_build.yml
@@ -28,13 +28,21 @@ jobs:
             standalone: OFF
     steps:
       - uses: actions/checkout@v4
+      - name: Cache vcpkg
+        uses: actions/cache@v4
+        with:
+          key: ${{ runner.os }}-vcpkg-x64-windows-static-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-vcpkg-x64-windows-static-
+          path: D:/a/vcpkg
       - name: Build Visual Studio
         if: ${{ matrix.generate == 'Visual Studio 17 2022' }}
+        env:
+          VCPKG_ROOT: D:/a/vcpkg
         run: |
           # Enable the viewer in CI (BUILD_UI is off by default), except on Win32:
-          # libultraship is x64-only. Its automate-vcpkg bootstraps the runner's
-          # vcpkg to fetch SDL2/GLEW/libzip/nlohmann-json/tinyxml2/spdlog.
-          $env:VCPKG_ROOT=$env:VCPKG_INSTALLATION_ROOT
+          # libultraship is x64-only. Its automate-vcpkg bootstraps vcpkg to
+          # fetch SDL2/GLEW/libzip/nlohmann-json/tinyxml2/spdlog.
           cmake -S . -B "build/${{ matrix.arch }}" -G "${{ matrix.generate }}" -DCMAKE_TOOLCHAIN_FILE="cmake/toolchain/${{ matrix.toolchain }}.cmake" -DCMAKE_GENERATOR_PLATFORM=${{ matrix.arch }} -DCMAKE_BUILD_TYPE:STRING=${{ matrix.config }} -DUSE_STANDALONE=${{ matrix.standalone }} -DBUILD_UI=${{ matrix.arch == 'Win32' && 'OFF' || 'ON' }} -DUSE_AUTO_VCPKG=ON -DVCPKG_TARGET_TRIPLET=x64-windows-static
           # Multi-config generator: pass --config, else it builds Debug and the
           # Release artifact path below finds nothing.
@@ -46,11 +54,12 @@ jobs:
           arch: ${{ matrix.arch }}
       - name: Build Ninja
         if: ${{ matrix.generate == 'Ninja' }}
+        env:
+          VCPKG_ROOT: D:/a/vcpkg
         run: |
           # Enable the viewer in CI, off on Win32 (libultraship is x64-only). Ninja
           # is single-platform, so name the vcpkg triplet explicitly (there is no
           # CMAKE_VS_PLATFORM_NAME for automate-vcpkg to key off).
-          $env:VCPKG_ROOT=$env:VCPKG_INSTALLATION_ROOT
           cmake -S . -B "build/${{ matrix.arch }}" -G "${{ matrix.generate }}" -DCMAKE_TOOLCHAIN_FILE="cmake/toolchain/${{ matrix.toolchain }}.cmake" -DCMAKE_BUILD_TYPE:STRING=${{ matrix.config }} -DUSE_STANDALONE=${{ matrix.standalone }} -DBUILD_UI=${{ matrix.arch == 'Win32' && 'OFF' || 'ON' }} -DUSE_AUTO_VCPKG=ON -DVCPKG_TARGET_TRIPLET=x64-windows-static
           cmake --build ./build/${{ matrix.arch }}
       - name: Publish packaged artifacts
-- 
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