glViewport

関数

レンダリング先のビューポート矩形の位置とサイズを設定する。

DLLOPENGL32.dll呼出規約winapi

シグネチャ

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

void glViewport(
    INT x,
    INT y,
    INT width,
    INT height
);

パラメーター

名前	型	方向
x	INT	in
y	INT	in
width	INT	in
height	INT	in

戻り値の型: void

各言語での呼び出し定義

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

void glViewport(
    INT x,
    INT y,
    INT width,
    INT height
);

[DllImport("OPENGL32.dll", ExactSpelling = true)]
static extern void glViewport(
    int x,   // INT
    int y,   // INT
    int width,   // INT
    int height   // INT
);

<DllImport("OPENGL32.dll", ExactSpelling:=True)>
Public Shared Sub glViewport(
    x As Integer,   ' INT
    y As Integer,   ' INT
    width As Integer,   ' INT
    height As Integer   ' INT
)
End Sub

' x : INT
' y : INT
' width : INT
' height : INT
Declare PtrSafe Sub glViewport Lib "opengl32" ( _
    ByVal x As Long, _
    ByVal y As Long, _
    ByVal width As Long, _
    ByVal height As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

glViewport = ctypes.windll.opengl32.glViewport
glViewport.restype = None
glViewport.argtypes = [
    ctypes.c_int,  # x : INT
    ctypes.c_int,  # y : INT
    ctypes.c_int,  # width : INT
    ctypes.c_int,  # height : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OPENGL32.dll')
glViewport = Fiddle::Function.new(
  lib['glViewport'],
  [
    Fiddle::TYPE_INT,  # x : INT
    Fiddle::TYPE_INT,  # y : INT
    Fiddle::TYPE_INT,  # width : INT
    Fiddle::TYPE_INT,  # height : INT
  ],
  Fiddle::TYPE_VOID)

#[link(name = "opengl32")]
extern "system" {
    fn glViewport(
        x: i32,  // INT
        y: i32,  // INT
        width: i32,  // INT
        height: i32  // INT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OPENGL32.dll")]
public static extern void glViewport(int x, int y, int width, int height);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OPENGL32_glViewport' -Namespace Win32 -PassThru
# $api::glViewport(x, y, width, height)

#uselib "OPENGL32.dll"
#func global glViewport "glViewport" sptr, sptr, sptr, sptr
; glViewport x, y, width, height
; x : INT -> "sptr"
; y : INT -> "sptr"
; width : INT -> "sptr"
; height : INT -> "sptr"

#uselib "OPENGL32.dll"
#func global glViewport "glViewport" int, int, int, int
; glViewport x, y, width, height
; x : INT -> "int"
; y : INT -> "int"
; width : INT -> "int"
; height : INT -> "int"

; void glViewport(INT x, INT y, INT width, INT height)
#uselib "OPENGL32.dll"
#func global glViewport "glViewport" int, int, int, int
; glViewport x, y, width, height
; x : INT -> "int"
; y : INT -> "int"
; width : INT -> "int"
; height : INT -> "int"

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

var (
	opengl32 = windows.NewLazySystemDLL("OPENGL32.dll")
	procglViewport = opengl32.NewProc("glViewport")
)

// x (INT), y (INT), width (INT), height (INT)
r1, _, err := procglViewport.Call(
	uintptr(x),
	uintptr(y),
	uintptr(width),
	uintptr(height),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure glViewport(
  x: Integer;   // INT
  y: Integer;   // INT
  width: Integer;   // INT
  height: Integer   // INT
); stdcall;
  external 'OPENGL32.dll' name 'glViewport';

result := DllCall("OPENGL32\glViewport"
    , "Int", x   ; INT
    , "Int", y   ; INT
    , "Int", width   ; INT
    , "Int", height   ; INT
    , "Int")   ; return: void

●glViewport(x, y, width, height) = DLL("OPENGL32.dll", "int glViewport(int, int, int, int)")
# 呼び出し: glViewport(x, y, width, height)
# x : INT -> "int"
# y : INT -> "int"
# width : INT -> "int"
# height : INT -> "int"
# 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)。