DDOPTSURFACEDESC

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DDSCAPS2
{
    public uint dwCaps;
    public uint dwCaps2;
    public uint dwCaps3;
    public _Anonymous_e__Union Anonymous;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DDOSCAPS
{
    public uint dwCaps;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DDOPTSURFACEDESC
{
    public uint dwSize;
    public uint dwFlags;
    public DDSCAPS2 ddSCaps;
    public DDOSCAPS ddOSCaps;
    public Guid guid;
    public uint dwCompressionRatio;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DDSCAPS2
    Public dwCaps As UInteger
    Public dwCaps2 As UInteger
    Public dwCaps3 As UInteger
    Public Anonymous As _Anonymous_e__Union
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DDOSCAPS
    Public dwCaps As UInteger
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DDOPTSURFACEDESC
    Public dwSize As UInteger
    Public dwFlags As UInteger
    Public ddSCaps As DDSCAPS2
    Public ddOSCaps As DDOSCAPS
    Public guid As Guid
    Public dwCompressionRatio As UInteger
End Structure

import ctypes
from ctypes import wintypes

class DDSCAPS2(ctypes.Structure):
    _fields_ = [
        ("dwCaps", wintypes.DWORD),
        ("dwCaps2", wintypes.DWORD),
        ("dwCaps3", wintypes.DWORD),
        ("Anonymous", _Anonymous_e__Union),
    ]

class DDOSCAPS(ctypes.Structure):
    _fields_ = [
        ("dwCaps", wintypes.DWORD),
    ]

class DDOPTSURFACEDESC(ctypes.Structure):
    _fields_ = [
        ("dwSize", wintypes.DWORD),
        ("dwFlags", wintypes.DWORD),
        ("ddSCaps", DDSCAPS2),
        ("ddOSCaps", DDOSCAPS),
        ("guid", GUID),
        ("dwCompressionRatio", wintypes.DWORD),
    ]

#[repr(C)]
pub struct DDSCAPS2 {
    pub dwCaps: u32,
    pub dwCaps2: u32,
    pub dwCaps3: u32,
    pub Anonymous: _Anonymous_e__Union,
}

#[repr(C)]
pub struct DDOSCAPS {
    pub dwCaps: u32,
}

#[repr(C)]
pub struct DDOPTSURFACEDESC {
    pub dwSize: u32,
    pub dwFlags: u32,
    pub ddSCaps: DDSCAPS2,
    pub ddOSCaps: DDOSCAPS,
    pub guid: GUID,
    pub dwCompressionRatio: u32,
}

import "golang.org/x/sys/windows"

type DDSCAPS2 struct {
	dwCaps uint32
	dwCaps2 uint32
	dwCaps3 uint32
	Anonymous _Anonymous_e__Union
}

type DDOSCAPS struct {
	dwCaps uint32
}

type DDOPTSURFACEDESC struct {
	dwSize uint32
	dwFlags uint32
	ddSCaps DDSCAPS2
	ddOSCaps DDOSCAPS
	guid windows.GUID
	dwCompressionRatio uint32
}

type
  DDSCAPS2 = record
    dwCaps: DWORD;
    dwCaps2: DWORD;
    dwCaps3: DWORD;
    Anonymous: _Anonymous_e__Union;
  end;

  DDOSCAPS = record
    dwCaps: DWORD;
  end;

  DDOPTSURFACEDESC = record
    dwSize: DWORD;
    dwFlags: DWORD;
    ddSCaps: DDSCAPS2;
    ddOSCaps: DDOSCAPS;
    guid: TGUID;
    dwCompressionRatio: DWORD;
  end;

const DDSCAPS2 = extern struct {
    dwCaps: u32,
    dwCaps2: u32,
    dwCaps3: u32,
    Anonymous: _Anonymous_e__Union,
};

const DDOSCAPS = extern struct {
    dwCaps: u32,
};

const DDOPTSURFACEDESC = extern struct {
    dwSize: u32,
    dwFlags: u32,
    ddSCaps: DDSCAPS2,
    ddOSCaps: DDOSCAPS,
    guid: GUID,
    dwCompressionRatio: u32,
};

type
  DDSCAPS2 {.bycopy.} = object
    dwCaps: uint32
    dwCaps2: uint32
    dwCaps3: uint32
    Anonymous: _Anonymous_e__Union

  DDOSCAPS {.bycopy.} = object
    dwCaps: uint32

  DDOPTSURFACEDESC {.bycopy.} = object
    dwSize: uint32
    dwFlags: uint32
    ddSCaps: DDSCAPS2
    ddOSCaps: DDOSCAPS
    guid: GUID
    dwCompressionRatio: uint32

struct DDSCAPS2
{
    uint dwCaps;
    uint dwCaps2;
    uint dwCaps3;
    _Anonymous_e__Union Anonymous;
}

struct DDOSCAPS
{
    uint dwCaps;
}

struct DDOPTSURFACEDESC
{
    uint dwSize;
    uint dwFlags;
    DDSCAPS2 ddSCaps;
    DDOSCAPS ddOSCaps;
    GUID guid;
    uint dwCompressionRatio;
}