glColor3f

関数

単精度値で現在の描画色をRGB各成分で設定する。

DLLOPENGL32.dll呼出規約winapi

シグネチャ

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

void glColor3f(
    FLOAT red,
    FLOAT green,
    FLOAT blue
);

パラメーター

名前	型	方向
red	FLOAT	in
green	FLOAT	in
blue	FLOAT	in

戻り値の型: void

各言語での呼び出し定義

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

void glColor3f(
    FLOAT red,
    FLOAT green,
    FLOAT blue
);

[DllImport("OPENGL32.dll", ExactSpelling = true)]
static extern void glColor3f(
    float red,   // FLOAT
    float green,   // FLOAT
    float blue   // FLOAT
);

<DllImport("OPENGL32.dll", ExactSpelling:=True)>
Public Shared Sub glColor3f(
    red As Single,   ' FLOAT
    green As Single,   ' FLOAT
    blue As Single   ' FLOAT
)
End Sub

' red : FLOAT
' green : FLOAT
' blue : FLOAT
Declare PtrSafe Sub glColor3f Lib "opengl32" ( _
    ByVal red As Single, _
    ByVal green As Single, _
    ByVal blue As Single)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

glColor3f = ctypes.windll.opengl32.glColor3f
glColor3f.restype = None
glColor3f.argtypes = [
    ctypes.c_float,  # red : FLOAT
    ctypes.c_float,  # green : FLOAT
    ctypes.c_float,  # blue : FLOAT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OPENGL32.dll')
glColor3f = Fiddle::Function.new(
  lib['glColor3f'],
  [
    Fiddle::TYPE_FLOAT,  # red : FLOAT
    Fiddle::TYPE_FLOAT,  # green : FLOAT
    Fiddle::TYPE_FLOAT,  # blue : FLOAT
  ],
  Fiddle::TYPE_VOID)

#[link(name = "opengl32")]
extern "system" {
    fn glColor3f(
        red: f32,  // FLOAT
        green: f32,  // FLOAT
        blue: f32  // FLOAT
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OPENGL32.dll")]
public static extern void glColor3f(float red, float green, float blue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OPENGL32_glColor3f' -Namespace Win32 -PassThru
# $api::glColor3f(red, green, blue)

#uselib "OPENGL32.dll"
#func global glColor3f "glColor3f" float, float, float
; glColor3f red, green, blue
; red : FLOAT -> "float"
; green : FLOAT -> "float"
; blue : FLOAT -> "float"

#uselib "OPENGL32.dll"
#func global glColor3f "glColor3f" float, float, float
; glColor3f red, green, blue
; red : FLOAT -> "float"
; green : FLOAT -> "float"
; blue : FLOAT -> "float"

; void glColor3f(FLOAT red, FLOAT green, FLOAT blue)
#uselib "OPENGL32.dll"
#func global glColor3f "glColor3f" float, float, float
; glColor3f red, green, blue
; red : FLOAT -> "float"
; green : FLOAT -> "float"
; blue : FLOAT -> "float"

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

var (
	opengl32 = windows.NewLazySystemDLL("OPENGL32.dll")
	procglColor3f = opengl32.NewProc("glColor3f")
)

// red (FLOAT), green (FLOAT), blue (FLOAT)
r1, _, err := procglColor3f.Call(
	uintptr(math.Float32bits(red)),
	uintptr(math.Float32bits(green)),
	uintptr(math.Float32bits(blue)),
)
_ = 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 glColor3f(
  red: Single;   // FLOAT
  green: Single;   // FLOAT
  blue: Single   // FLOAT
); stdcall;
  external 'OPENGL32.dll' name 'glColor3f';

result := DllCall("OPENGL32\glColor3f"
    , "Float", red   ; FLOAT
    , "Float", green   ; FLOAT
    , "Float", blue   ; FLOAT
    , "Int")   ; return: void

●glColor3f(red, green, blue) = DLL("OPENGL32.dll", "int glColor3f(float, float, float)")
# 呼び出し: glColor3f(red, green, blue)
# red : FLOAT -> "float"
# green : FLOAT -> "float"
# blue : 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)。