ci: add Windows native build

x86_64-pc-windows-msvc build without mingw dependency. For now it lacks
some key dependencies like lua or shaderc. Will be extended in the
future.

.github/workflows/build.yml

@@ -86,6 +86,67 @@ jobs:
           name: mpv-${{ matrix.target }}
           path: mpv-git-*.zip
 
+  win32:
+    runs-on: windows-latest
+    env:
+      VS: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise"
+      CC: "clang"
+      CXX: "clang++"
+      CC_LD: "lld"
+      CXX_LD: "lld"
+      WINDRES: "llvm-rc"
+    steps:
+      - name: Disable autocrlf
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - uses: actions/checkout@v4
+
+      # https://github.com/mesonbuild/meson/pull/11715
+      - name: Install dependencies
+        run: |
+          git clone https://github.com/kasper93/meson --depth 1 -b 8981
+          python -m pip install build wheel
+          python -m build --wheel --no-isolation meson
+          python -m pip install (Get-Item ./meson/dist/meson-*-py3-none-any.whl).FullName
+
+      - name: Update Meson WrapDB
+        run: |
+          meson wrap update-db
+
+      - name: Build
+        id: build
+        run: |
+          $env:PATH = ($env:PATH -split ';' | Where-Object { $_ -ne 'C:\Program Files\LLVM\bin' }) -join ';'
+          Import-Module "$env:VS\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+          Enter-VsDevShell -VsInstallPath $env:VS -SkipAutomaticLocation -DevCmdArguments "-arch=x64 -host_arch=x64"
+          ./ci/build-win32.ps1
+
+      - name: Print build log
+        if: ${{ failure() && steps.build.outcome == 'failure' }}
+        run: |
+          cat ./build/meson-logs/meson-log.txt
+
+      - name: Run meson tests
+        id: tests
+        run: |
+          Import-Module "$env:VS\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+          Enter-VsDevShell -VsInstallPath $env:VS -SkipAutomaticLocation -DevCmdArguments "-arch=x64 -host_arch=x64"
+          meson test -C build mpv:
+
+      - name: Print meson test log
+        if: ${{ failure() && steps.tests.outcome == 'failure' }}
+        run: |
+          cat ./build/meson-logs/testlog.txt
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: mpv-x86_64-windows-msvc
+          path: |
+            build/mpv.???
+            !build/mpv.lib
+
   macos:
     runs-on: ${{ matrix.os }}
     strategy:

ci/build-win32.ps1

@@ -0,0 +1,74 @@
+$ErrorActionPreference = "Stop"
+Set-StrictMode -Version Latest
+
+$subprojects = "subprojects"
+if (-not (Test-Path $subprojects)) {
+    New-Item -Path $subprojects -ItemType Directory | Out-Null
+}
+
+$projects = @(
+    @{
+        Path = "$subprojects/ffmpeg.wrap"
+        URL = "https://gitlab.freedesktop.org/gstreamer/meson-ports/ffmpeg.git"
+        Revision = "meson-6.1"
+        Provides = @(
+            "libavcodec = libavcodec_dep",
+            "libavdevice = libavdevice_dep",
+            "libavfilter = libavfilter_dep",
+            "libavformat = libavformat_dep",
+            "libavutil = libavutil_dep",
+            "libswresample = libswresample_dep",
+            "libswscale = libswscale_dep"
+        )
+    },
+    @{
+        Path = "$subprojects/libass.wrap"
+        URL = "https://github.com/libass/libass"
+        Revision = "master"
+    },
+    @{
+        Path = "$subprojects/libplacebo.wrap"
+        URL = "https://code.videolan.org/videolan/libplacebo.git"
+        Revision = "master"
+    },
+    # Remove harfbuzz wrap once the new version with build fixes is released.
+    @{
+        Path = "$subprojects/harfbuzz.wrap"
+        URL = "https://github.com/harfbuzz/harfbuzz"
+        Revision = "main"
+        Provides = @(
+            "harfbuzz = libharfbuzz_dep"
+        )
+    }
+)
+
+foreach ($project in $projects) {
+    $content = @"
+[wrap-git]
+url = $($project.URL)
+revision = $($project.Revision)
+depth = 1
+clone-recursive = true
+"@
+    if ($project.ContainsKey('Provides')) {
+        $provide = "[provide]`n$($project.Provides -join "`n")"
+        $content += "`n$provide"
+    }
+    Set-Content -Path $project.Path -Value $content
+}
+
+meson setup build `
+    -Ddefault_library=static `
+    -Dlibmpv=true `
+    -Dtests=true `
+    -Dgpl=true `
+    -Dffmpeg:gpl=enabled `
+    -Dffmpeg:tests=disabled `
+    -Dffmpeg:programs=disabled `
+    -Dlcms2:fastfloat=true `
+    -Dlibplacebo:demos=false `
+    -Dlibplacebo:lcms=enabled `
+    -Dlibplacebo:vulkan=enabled `
+    -Djavascript=enabled
+ninja -C build mpv.exe mpv.com libmpv.a
+./build/mpv.com -v --no-config