glGetTexImage

// OPENGL32.dll
#include <windows.h>

void glGetTexImage(
    DWORD target,
    INT level,
    DWORD format,
    DWORD type,
    void* pixels
);

<DllImport("OPENGL32.dll", ExactSpelling:=True)>
Public Shared Sub glGetTexImage(
    target As UInteger,   ' DWORD
    level As Integer,   ' INT
    format As UInteger,   ' DWORD
    type As UInteger,   ' DWORD
    pixels As IntPtr   ' void* in/out
)
End Sub

' target : DWORD
' level : INT
' format : DWORD
' type : DWORD
' pixels : void* in/out
Declare PtrSafe Sub glGetTexImage Lib "opengl32" ( _
    ByVal target As Long, _
    ByVal level As Long, _
    ByVal format As Long, _
    ByVal type As Long, _
    ByVal pixels As LongPtr)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

glGetTexImage = ctypes.windll.opengl32.glGetTexImage
glGetTexImage.restype = None
glGetTexImage.argtypes = [
    wintypes.DWORD,  # target : DWORD
    ctypes.c_int,  # level : INT
    wintypes.DWORD,  # format : DWORD
    wintypes.DWORD,  # type : DWORD
    ctypes.POINTER(None),  # pixels : void* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OPENGL32.dll')
glGetTexImage = Fiddle::Function.new(
  lib['glGetTexImage'],
  [
    -Fiddle::TYPE_INT,  # target : DWORD
    Fiddle::TYPE_INT,  # level : INT
    -Fiddle::TYPE_INT,  # format : DWORD
    -Fiddle::TYPE_INT,  # type : DWORD
    Fiddle::TYPE_VOIDP,  # pixels : void* in/out
  ],
  Fiddle::TYPE_VOID)

#[link(name = "opengl32")]
extern "system" {
    fn glGetTexImage(
        target: u32,  // DWORD
        level: i32,  // INT
        format: u32,  // DWORD
        type: u32,  // DWORD
        pixels: *mut ()  // void* in/out
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OPENGL32.dll")]
public static extern void glGetTexImage(uint target, int level, uint format, uint type, IntPtr pixels);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OPENGL32_glGetTexImage' -Namespace Win32 -PassThru
# $api::glGetTexImage(target, level, format, type, pixels)

#uselib "OPENGL32.dll"
#func global glGetTexImage "glGetTexImage" sptr, sptr, sptr, sptr, sptr
; glGetTexImage target, level, format, type, pixels
; target : DWORD -> "sptr"
; level : INT -> "sptr"
; format : DWORD -> "sptr"
; type : DWORD -> "sptr"
; pixels : void* in/out -> "sptr"

#uselib "OPENGL32.dll"
#func global glGetTexImage "glGetTexImage" int, int, int, int, sptr
; glGetTexImage target, level, format, type, pixels
; target : DWORD -> "int"
; level : INT -> "int"
; format : DWORD -> "int"
; type : DWORD -> "int"
; pixels : void* in/out -> "sptr"

; void glGetTexImage(DWORD target, INT level, DWORD format, DWORD type, void* pixels)
#uselib "OPENGL32.dll"
#func global glGetTexImage "glGetTexImage" int, int, int, int, intptr
; glGetTexImage target, level, format, type, pixels
; target : DWORD -> "int"
; level : INT -> "int"
; format : DWORD -> "int"
; type : DWORD -> "int"
; pixels : void* in/out -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	opengl32 = windows.NewLazySystemDLL("OPENGL32.dll")
	procglGetTexImage = opengl32.NewProc("glGetTexImage")
)

// target (DWORD), level (INT), format (DWORD), type (DWORD), pixels (void* in/out)
r1, _, err := procglGetTexImage.Call(
	uintptr(target),
	uintptr(level),
	uintptr(format),
	uintptr(type),
	uintptr(pixels),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure glGetTexImage(
  target: DWORD;   // DWORD
  level: Integer;   // INT
  format: DWORD;   // DWORD
  type: DWORD;   // DWORD
  pixels: Pointer   // void* in/out
); stdcall;
  external 'OPENGL32.dll' name 'glGetTexImage';

result := DllCall("OPENGL32\glGetTexImage"
    , "UInt", target   ; DWORD
    , "Int", level   ; INT
    , "UInt", format   ; DWORD
    , "UInt", type   ; DWORD
    , "Ptr", pixels   ; void* in/out
    , "Int")   ; return: void

●glGetTexImage(target, level, format, type, pixels) = DLL("OPENGL32.dll", "int glGetTexImage(dword, int, dword, dword, void*)")
# 呼び出し: glGetTexImage(target, level, format, type, pixels)
# target : DWORD -> "dword"
# level : INT -> "int"
# format : DWORD -> "dword"
# type : DWORD -> "dword"
# pixels : void* in/out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。