Add cmake build script (pwsh)

build_for_win32.ps1

@@ -0,0 +1,47 @@
+param (
+    [string]$buildtype = "Release",
+    [int]$clean = 0  # Before building, delete the build directory entirely
+)
+
+function check_command {
+    param([string]$command)
+    if ((get-command $command -ea silentlycontinue) -eq $null) {
+        return 1;
+    }
+    return 0;
+}
+
+if (check_command("cl") -e 0) {
+    ./vcvars2019.ps1
+}
+
+# Check prerequisites
+$missing = check_command("cmake")
+$missing += check_command("ninja")
+$missing += check_command("cl")
+
+if ($missing) {
+    write-host "Visual Studio 2019 was not found!"
+    return;
+}
+
+$builddir = "$psscriptroot/build/win32/$buildtype"
+
+if ($clean -ne 0) {
+    write-host "-- Cleaning.."
+    rm -r -force -ea silentlycontinue $builddir
+}
+
+write-host "Building $buildtype to $builddir"
+pushd # Store current path
+
+mkdir -ea silentlycontinue $builddir
+cd $builddir
+
+cmake ../../../physx -G Ninja -DCMAKE_BUILD_TYPE="$buildtype"
+
+cmake --build . --config $buildtype --target install
+
+popd # Restore current path
+
+exit $LastExitCode

vcvars2019.ps1

@@ -0,0 +1,8 @@
+pushd "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build"
+cmd /c "vcvars64.bat&set" | foreach {
+  if ($_ -match "=") {
+    $v = $_.split("="); set-item -force -path "ENV:\$($v[0])"  -value "$($v[1])"
+  }
+}
+popd
+Write-Host "Visual Studio 2019 Command Prompt variables set." -ForegroundColor Yellow