I didn't test this game for a long time, but honestly, currently it's on my not-working-list.
This game is one of those that are placing physical window(s) on top of the rendering window (for providing windows controls like check boxes, text input fields,...) so the game cannot be run in fullscreen (hardwired DX11 behavior) and may work in windowed mode only if resolution is not forced.

I don't think that fullscreen is issue as given workaround works just fine. There are some mini graphical glitches when in menu in windowed mode but they are completely harmless. On the other had flashing Windows mouse cursor is annoying, from what I see Diablo 1 is using software mouse pointer and Windows 10 pointer is just interfering with it. It's completely random but at some point whenever I move mouse I see many Windows mouse pointers randomly appearing all over my screen.

Dege wrote:

I didn't test this game for a long time, but honestly, currently it's on my not-working-list.
This game is one of those that are placing physical window(s) on top of the rendering window (for providing windows controls like check boxes, text input fields,...) so the game cannot be run in fullscreen (hardwired DX11 behavior) and may work in windowed mode only if resolution is not forced.

Using these cvars with latest WIP build allows game to run nearly perfectly fine:

WindowedAttributes = borderless, fullscreensize
AppControlledScreenMode = true
DisableAltEnterToToggleScreenMode = false
DeferredScreenModeSwitch = true

Sadly, Windows 10 mouse cursor is still randomly flashing during play.

dgVoodoo appears to attempt to force hide the mouse from what I could see happening on a D3D8 game as well. I created a plugin for my personal projects to avoid this by hooking SetCursor and forcing it back to a standard arrow when desired to deal with this for my users that land up using dgVoodoo.

Hey there! So I've made a video to depict what's happening. Take a look at top left corner of the flick when I am moving mouse fast, around 0:05 to 0:15sec it's easily visible. The Windows mouse cursor is popping in on top of Diablo 1. This mouse cursor flashing happens across whole screen and also out of game area(I am playing boxed). Here is the link to short video:

https://www.youtube.com/watch?v=Nm0OAC62UHU

What more to say, it's not only Diablo related. Warcraft Adventures for example have exactly same issue and I've only tried just few apps total. In order to combat this I have tried pretty much every possible config combination and most older dgvoodoo2 builds but still can't get rid of it. Now I am using latest dgvoodoo2, I am starting game in borderless 1440x1080 to keep aspect ratio on my 1920x1080 screen. There are glitches in menu but they are pretty random and don't affect anything. After I get out of menu, into actual game and load character I am hitting [ALT] + [Enter] to force my game to run in 1440x1080 fullscreen which creates black borders on sides with image centered. The quality is very good compared to other wrappers and game works flawlessly, except for this random mouse cursor flicker. I can use many dgvoodoo2 options and even things like reshade to alter image output. Here is my current config:

;========================================================================== ; === Text based config file for dgVoodoo2 ; === Use […]
Show full quote

;==========================================================================
; === Text based config file for dgVoodoo2
; === Use this file if you are a game modder/hacker or an experted user and
; want to modify some advanced properties not available via the CPL.
;==========================================================================

Version = 0x263

;--------------------------------------------------------------------------

[General]

; OutputAPI: "d3d11warp", "d3d11_fl10_0", "d3d11_fl10_1", "d3d11_fl11_0", "bestavailable"
; Adapters: "all", or the ordinal of the adapter (1, ...)
;FullScreenOutput: "default", or the ordinal of the output on the adapter (1, ...)
; ScalingMode: "unspecified", "centered", "stretched", "centered_ar", "stretched_ar",
; "stretched_4_3", "stretched_4_3_crt", "stretched_4_3_c64"

OutputAPI = bestavailable
Adapters = all
FullScreenOutput = default
FullScreenMode = true
ScalingMode = centered_ar
ProgressiveScanlineOrder = true
EnumerateRefreshRates = false

Brightness = 100
Color = 100
Contrast = 100
InheritColorProfileInFullScreenMode = true

KeepWindowAspectRatio = true
CaptureMouse = true
CenterAppWindow = true

;--------------------------------------------------------------------------

[GeneralExt]

; DesktopResolution: Desktop (native) resolution can be forced for dgVoodoo's internal calculations.
; Useful for rare applications that pre-set the desktop to other than the native
; resolution before dgVoodoo gets in action. Only the compact format can be used here,
; and applies to all outputs of the desktop.
; DesktopBitDepth: You can define what screen bit depth should be reported through dgVoodoo
; (8, 16, 32)
; DeframerSize: When resolution is forced to other than the app default then
; a black frame is drawn around the output image coming from a wrapped API
; to remove scaling artifacts -
; frame thickness can be defined in pixels (max 16, 0 = disable)
; ImageScaleFactor: Integer factor for scaling the output image coming from a wrapped API
; Always done by nearest point filtering, independent on scaling mode
; (0 = max available)
; Separate factors can be defined for horizontal and vertical scaling
; by subproperties, e.g.
; ImageScaleFactor = x:3, y:2
; DisplayROI: Display region of interest
; If scaling is done by the dgVoodoo then you can define a subrect of the
; output image, coming from a wrapped API, to be displayed. The defined subrect
; is mapped to the display output according to the current scaling mode
; It can be useful for applications rendering a widescreen subimage into a 4:3
; resolution; in this case you can scale up that subimage to (nearly) fill the
; whole screen on a widescreen monitor.
; DisplayROI empty value means the whole image.
; DisplayROI value can be a proportion in form of %d_%d or a pixel size (%d|%d)
; Pos subproperty is not mandatory and can be 'centered' or a pixel position (%d|%d)
; Examples: DisplayROI = 16_9, pos:centered
; DisplayROI = (320|200), pos:(10|10)
; Resampling: When scaling is done by the dgVoodoo for the given scaling mode,
; you can choose which filter is to be used for resampling the output image
; Available filters are: "pointsampled", "bilinear", "bicubic", "lanczos-2", "lanczos-3"
; FreeMouse: If true then physical mouse is free to move inside the game window
; when using emulated scaling and/or application and forced resolution
; differs; can be useful when a game relies on the physical window size
; WindowedAttributes: You can define attributes for forced windowed appearance (separated by commas):
; "borderless" - forces the app window not have any border
; "alwaysontop" - forces the app window into the top-most band
; "fullscreensize" - forces the app window to be full screen size with image scaling inside
; Environment: Software environment in which dgVoodoo is running: can be left unspecified (native)
; or can be set to 'DosBox' or 'QEmu'.
; EnableGDIHooking: If enabled then dgVoodoo hooks GDI to be able to render graphical contents
; (like movie playback through the ancient Windows Multimedia AVI player library)
; rendered through GDI - experimental feature, for the time being it's implemented
; only for DX emulation

DesktopResolution = 1920x1080
DesktopBitDepth = 32
DeframerSize = 1
ImageScaleFactor = 1
DisplayROI =
Resampling =
FreeMouse = false
WindowedAttributes = borderless
Environment =
EnableGDIHooking = true

;--------------------------------------------------------------------------

[Glide]

; VideoCard: "voodoo_graphics", "voodoo_rush", "voodoo_2", "voodoo_banshee", "other_greater"
; OnboardRAM: in MBs
; MemorySizeOfTMU: in kBs
; TMUFiltering: "appdriven", "pointsampled", "bilinear"
;
; Resolution: either "unforced", "max", "max_isf", "max_fhd", "max_fhd_isf", "max_qhd", "max_qhd_isf", "%d x"
; or subproperties: h: horizontal, v: vertical
; + optional subproperty refrate: refresh rate in Hz
; e.g. Resolution = max, refrate:60
; Resolution = 2x, refrate:59
; Resolution = h:1280, v:1024, refrate:75
; or just use the compact form like "1024x768@60" or "512x384"
;
;Antialiasing: "off", "appdriven", "2x", "4x", "8x", "16x" (your GPU must support the chosen one)

VideoCard = voodoo_2
OnboardRAM = 8
MemorySizeOfTMU = 4096
NumberOfTMUs = 2
TMUFiltering = appdriven
DisableMipmapping = false
Resolution = unforced
Antialiasing = appdriven

EnableGlideGammaRamp = true
ForceVerticalSync = true
ForceEmulatingTruePCIAccess = false
16BitDepthBuffer = false
3DfxWatermark = true
3DfxSplashScreen = false
PointcastPalette = false
EnableInactiveAppState = false

;--------------------------------------------------------------------------

[GlideExt]

; DitheringEffect: "pure32bit", "dither2x2", "dither4x4"
; Dithering: "disabled", "appdriven", "forcealways"
; DitherOrderedMatrixSizeScale: integer scale value for dither matrix size
; 1 = normal, 2 = double size, etc.
; 0 = automatic (the aim is to have some retro feel&look)

DitheringEffect = pure32bit
Dithering = forcealways
DitherOrderedMatrixSizeScale = 0

;--------------------------------------------------------------------------

[DirectX]

; VideoCard: "svga", "internal3D", "geforce_ti_4800", "ati_radeon_8500",
; "matrox_parhelia-512", "geforce_fx_5700_ultra"
; VRAM: in MBs (default) or in GBs (e.g. VRAM = 2GB)
; Filtering: "appdriven", "pointsampled", "bilinear", "linearmip", "trilinear"
; or the integer value of an anisotropic filtering level (1-16)

DisableAndPassThru = false

VideoCard = internal3D
VRAM = 512
Filtering = 16
DisableMipmapping = false
Resolution = h:1440, v:1080
Antialiasing = off

AppControlledScreenMode = true
DisableAltEnterToToggleScreenMode = false

BilinearBlitStretch = false
PhongShadingWhenPossible = true
ForceVerticalSync = false
dgVoodooWatermark = false
FastVideoMemoryAccess = false

;--------------------------------------------------------------------------

[DirectXExt]

; AdapterIDType: "nvidia", "amd", "intel" or leave it undefined
; You can define what type of driver version and vendor id's the wrapper should report to
; the application; Some games rely on that information so it can be useful for them
; Can be defined only for SVGA and Internal3D card types; the others have their own wired
; information

; VendorID, DeviceID, SubsystemID, RevisionID:
; Can be defined only for SVGA and Internal3D card types
; You can overwrite these properties even if a non-default AdapterIDType is defined;
; say, you defined an nvidia id type but would like to refine the vendor id

; DefaultEnumeratedResolutions: you can define what resolutions should be enumerated to the application by default
; "all", "classics", "none"

; ExtraEnumeratedResolutions: you can add extra resolutions (separated by commas, max 16) that will get
; enumerated to the application as display adapter supported ones -
; can be useful if an app supports rendering at arbitrary resolutions
; and you have a particular favorite resolution that are not
; enumerated to the application by default
; you can either use the compact resolution format here, or
; "max", "max@refrate" meaning your desktop resolution with a potential refresh rate, or
; "max_4_3", "max_4_3@refrate", "max_16_9", "max_16_9@refrate"
; meaning the maximum resolution with the given aspect ratio calculated from
; the desktop resolution with the given refresh rate, e.g. "max_4_3@60", "max_16_9"

; EnumeratedResolutionBitdepths: you can filter what bitdepths are included in the resolution enumeration
; any subset of {"8", "16", "32"}, or "all"

; DitheringEffect: "pure32bit", "ordered2x2", "ordered4x4"
; Dithering: "disabled", "appdriven", "forceon16bit", "forcealways"
; DitherOrderedMatrixSizeScale: integer scale value for dither matrix size
; 1 = normal, 2 = double size, etc.
; 0 = automatic
; DepthBuffersBitDepth: internal bit depth of depth/stencil buffers for 3D rendering (32 bit is not recommended)
; "appdriven", "forcemin24bit", "force32bit"

; MaxVSConstRegisters: Max number of vertex shader constant registers (DX8/9 only)
; Can be defined only for SVGA and Internal3D card types
; Valid values are 256 (default), 512 or 1024

; MSD3DDeviceNames: if true then original Microsoft D3D device names are exposed
; (some applications check for them and they fail)

; RTTexturesForceScaleAndMSAA: if true then forced resolution scaling and MSAA is
; applied also to rendertarget textures
; Set it to false for games requiring pixel-precise rendering
; but be careful it can EASILY break certain things, not recommended

; SmoothedDepthSampling: if true then extra smoothing is added to depth textures
; when they are sampled

; DeferredScreenModeSwitch: If true the switching to full screen is deferred after the application initialized
; the DirectX device; can be useful for games that don't expect rendering window changes
; during initialization and crash

; PrimarySurfaceBatchedUpdate: If true then direct changes of the primary surface are batched together for presenting them
; If false then each change is instantly presented (debug-like mode)

AdapterIDType = nvidia
VendorID =
DeviceID =
SubsystemID =
RevisionID =

DefaultEnumeratedResolutions = all
ExtraEnumeratedResolutions =
EnumeratedResolutionBitdepths = all

DitheringEffect = ordered4x4
Dithering = forcealways
DitherOrderedMatrixSizeScale = 0
DepthBuffersBitDepth = appdriven

MaxVSConstRegisters = 1024

MSD3DDeviceNames = false
RTTexturesForceScaleAndMSAA = false
SmoothedDepthSampling = true
DeferredScreenModeSwitch = true
PrimarySurfaceBatchedUpdate = true
;--------------------------------------------------------------------------

[Debug]

; This section affects only debug/spec release builds
;
; Info, Warning, Error
; "Disable" - disables all messages and debugger break
; "Enable" - enables messages and disables debugger break
; "EnableBreak" - enables both messages and breaking into debugger
;
; MaxTraceLevel: Maximum level of tracing API calls
; 0 - Disable
; 1 - API Functions and methods
; 2 - Additional trace info for internals
;
; LogToFile: if false or debugger is detected then output goes to the debug output
; if true and no debugger detected then output goes to 'dgVoodoo.log'
; (not implemented yet, always the default debug output is used)

Info = enable
Warning = enable
Error = enable
MaxTraceLevel = 0

LogToFile = false

I could use alternate way of forcing similar resolution, like leaving "Resolution" line empty and setting "ImageScaleFactor" to "2" that would create similar 1280x960 image but the flicker would be there as well. I strong suspect scaler because if I force game to run in native 640x480 window with dgvoodoo2 but use "IntegerScaler" app for scaling to 1280x960 instead of dgvoodoo2 one then the flicker is gone.

Is there any solution?