AutoDisplayChanger.ps1

# ===================================================
#       AutoDisplayChanger.ps1, by Songbirb
# ---------------------------------------------------
# I run in the background and check the application ($appLaunch) status every $interval seconds.
# When the application is detected, I save the current resolution and set it to $newWidth x $newHeight.
# Within $interval seconds of $appLaunch closing, I restore the original resolution and exit.
# ===================================================
param(
    # The name of the application to monitor
    [string]$appLaunch = "Palworld-Win64-Shipping",
    # The interval for checking the application status
    [int]$interval = 5,
    # The desired resolution for the application
    [int]$newWidth = 1920,
    [int]$newHeight = 1080,
    # The normal desktop resolution
    [int]$oldWidth,
    [int]$oldHeight,
    # The switch for launching the application without Steam
    [switch]$steamless
)


# ===================================================
#    SCRIPT CONTENTS - DO NOT EDIT BELOW THIS LINE
# ---------------------------------------------------
# I require the DisplaySettings module from Powershell-Gallery
Import-Module DisplaySettings
# This is a flag.
$changed = $false
Clear-Host

# If oldWidth and oldHeight are not specified, get them from the video controller
if (!$oldWidth -or !$oldHeight) {
    Write-Host -NoNewline "Detected: "
    $videoController = Get-CimInstance -ClassName Win32_VideoController
    Write-Host $videoController.Name
    Write-Host -NoNewline "Current Mode? "
# Most methods don't return the physical resolution, but gdi32.dll does!
Add-Type @"
using System;
using System.Runtime.InteropServices;
public class PInvoke {
    [DllImport("user32.dll")] public static extern IntPtr GetDC(IntPtr hwnd);
    [DllImport("gdi32.dll")] public static extern int GetDeviceCaps(IntPtr hdc, int nIndex);
}
"@
    $hdc = [PInvoke]::GetDC([IntPtr]::Zero)
    $oldWidth = [PInvoke]::GetDeviceCaps($hdc, 118) # width from gdi32
    $oldHeight = [PInvoke]::GetDeviceCaps($hdc, 117) # height from gdi32
    Write-Host -NoNewline "$oldWidth x "
    Write-Host -NoNewline "$oldHeight @"
    $oldRefresh = $videoController.CurrentRefreshRate
    Write-Host -NoNewline "$oldRefresh"
    Write-Host "Hz."
    Write-Host "If this is incorrect, specify -oldHeight and -oldWidth!"
    Write-Host
    Start-Sleep -Seconds (1)
}


# Launch the application and wait an interval for it to launch.
# Check the value of the -steamless switch
if ($steamless) {
    # Launch the application without Steam and let the user know
    Write-Host "Starting $appLaunch`.exe..."
    Write-Host "    (Path: $PSScriptRoot)"
    Start-Process (Resolve-Path "$PSScriptRoot\$appLaunch.exe")
}
else {
    # Wait for Steam to launch the application
    Write-Host Waiting for Steam to start $appLaunch`.exe!
}
Start-Sleep -Seconds (1+$interval)


# Define a loop to check the status every $interval seconds
while ($true) {
    # Gets the process object for $appLaunch and stores it
    $process = Get-Process -Name $appLaunch -ErrorAction SilentlyContinue
    # Process exists? App running!
    if ($process) {
        # If the flag hasn't been set, we need to change the resolution.
        if (!$changed) {
            Write-Host "Detected $appLaunch`.exe running!"
            Write-Host "Setting desired video mode ($newWidth x $newHeight)..."
            Set-DisplayResolution -Width $newWidth -Height $newHeight
            Write-Host "Screen should be set to $newWidth, $newHeight now!"
            # Set the flag to true so we can cleanup later.
            $changed = $true
        }
    }
    # No process? App is closed.
    else {
        # If the flag is set, we have to clean up:
        if ($changed) {
            Write-Host "Setting original video mode ($oldWidth x $oldHeight)."
            Set-DisplayResolution -Width $oldWidth -Height $oldHeight
            $changed = $false
            Write-Host "All tasks complete - closing!"
            Start-Sleep -Seconds (1+$interval)
        #   stop-process -Id $PID
        }
    }
    # wait a little while before testing again
    Start-Sleep -Seconds $interval
}