glTexEnvf

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

void glTexEnvf(
    DWORD target,
    DWORD pname,
    FLOAT param2
);

<DllImport("OPENGL32.dll", ExactSpelling:=True)>
Public Shared Sub glTexEnvf(
    target As UInteger,   ' DWORD
    pname As UInteger,   ' DWORD
    param2 As Single   ' FLOAT
)
End Sub

' target : DWORD
' pname : DWORD
' param2 : FLOAT
Declare PtrSafe Sub glTexEnvf Lib "opengl32" ( _
    ByVal target As Long, _
    ByVal pname As Long, _
    ByVal param2 As Single)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

glTexEnvf = ctypes.windll.opengl32.glTexEnvf
glTexEnvf.restype = None
glTexEnvf.argtypes = [
    wintypes.DWORD,  # target : DWORD
    wintypes.DWORD,  # pname : DWORD
    ctypes.c_float,  # param2 : FLOAT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OPENGL32.dll')
glTexEnvf = Fiddle::Function.new(
  lib['glTexEnvf'],
  [
    -Fiddle::TYPE_INT,  # target : DWORD
    -Fiddle::TYPE_INT,  # pname : DWORD
    Fiddle::TYPE_FLOAT,  # param2 : FLOAT
  ],
  Fiddle::TYPE_VOID)

#[link(name = "opengl32")]
extern "system" {
    fn glTexEnvf(
        target: u32,  // DWORD
        pname: u32,  // DWORD
        param2: f32  // FLOAT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OPENGL32.dll")]
public static extern void glTexEnvf(uint target, uint pname, float param2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OPENGL32_glTexEnvf' -Namespace Win32 -PassThru
# $api::glTexEnvf(target, pname, param2)

#uselib "OPENGL32.dll"
#func global glTexEnvf "glTexEnvf" sptr, sptr, float
; glTexEnvf target, pname, param2
; target : DWORD -> "sptr"
; pname : DWORD -> "sptr"
; param2 : FLOAT -> "float"

#uselib "OPENGL32.dll"
#func global glTexEnvf "glTexEnvf" int, int, float
; glTexEnvf target, pname, param2
; target : DWORD -> "int"
; pname : DWORD -> "int"
; param2 : FLOAT -> "float"

; void glTexEnvf(DWORD target, DWORD pname, FLOAT param2)
#uselib "OPENGL32.dll"
#func global glTexEnvf "glTexEnvf" int, int, float
; glTexEnvf target, pname, param2
; target : DWORD -> "int"
; pname : DWORD -> "int"
; param2 : FLOAT -> "float"

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

var (
	opengl32 = windows.NewLazySystemDLL("OPENGL32.dll")
	procglTexEnvf = opengl32.NewProc("glTexEnvf")
)

// target (DWORD), pname (DWORD), param2 (FLOAT)
r1, _, err := procglTexEnvf.Call(
	uintptr(target),
	uintptr(pname),
	uintptr(math.Float32bits(param2)),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

procedure glTexEnvf(
  target: DWORD;   // DWORD
  pname: DWORD;   // DWORD
  param2: Single   // FLOAT
); stdcall;
  external 'OPENGL32.dll' name 'glTexEnvf';

result := DllCall("OPENGL32\glTexEnvf"
    , "UInt", target   ; DWORD
    , "UInt", pname   ; DWORD
    , "Float", param2   ; FLOAT
    , "Int")   ; return: void

●glTexEnvf(target, pname, param2) = DLL("OPENGL32.dll", "int glTexEnvf(dword, dword, float)")
# 呼び出し: glTexEnvf(target, pname, param2)
# target : DWORD -> "dword"
# pname : DWORD -> "dword"
# param2 : FLOAT -> "float"
# 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)。