inital, almost working cross-compilation setup with Visual Studio and cmake

scripts/build_sdl_windows.ps1

@@ -0,0 +1,48 @@
+param(
+    [string]$BuildType = "Release"
+)
+
+$ProjectRoot = Resolve-Path "$PSScriptRoot\.."
+$SdlSource   = "$ProjectRoot\external\SDL"
+$BuildDir    = "$ProjectRoot\out\build\_sdl_build\windows"
+$PrebuiltDir = "$ProjectRoot\prebuilt\windows"
+
+function Build-SDL {
+    param([string]$LinkType)
+
+    $Shared   = if ($LinkType -eq "dynamic") { "ON" } else { "OFF" }
+    $Static   = if ($LinkType -eq "static")  { "ON" } else { "OFF" }
+    $OutDir   = "$PrebuiltDir\SDL3-$LinkType"
+    $BuildOut = "$BuildDir\$LinkType"
+
+    Write-Host "`n=== Building SDL3 ($LinkType) for Windows ===" -ForegroundColor Cyan
+
+    # Wipe any stale build directory to avoid corrupted cache issues
+    if (Test-Path $BuildOut) {
+        Write-Host "Removing stale build directory: $BuildOut" -ForegroundColor Yellow
+        Remove-Item -Recurse -Force $BuildOut
+    }
+
+    cmake -S "$SdlSource" -B "$BuildOut" `
+        -G "Visual Studio 17 2022" `
+        -A x64 `
+        -DCMAKE_INSTALL_PREFIX="$OutDir" `
+        -DSDL_SHARED="$Shared" `
+        -DSDL_STATIC="$Static" `
+        -DSDL_INSTALL=ON `
+        -DSDL_TEST_LIBRARY=OFF `
+        -DSDL_TESTS=OFF
+
+    if ($LASTEXITCODE -ne 0) { Write-Error "CMake configure failed"; exit 1 }
+
+    cmake --build "$BuildOut" --config "$BuildType"
+    if ($LASTEXITCODE -ne 0) { Write-Error "CMake build failed"; exit 1 }
+
+    cmake --install "$BuildOut" --config "$BuildType"
+    if ($LASTEXITCODE -ne 0) { Write-Error "CMake install failed"; exit 1 }
+
+    Write-Host "=== Done: $OutDir ===" -ForegroundColor Green
+}
+
+Build-SDL -LinkType "dynamic"
+Build-SDL -LinkType "static"