1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
3
4package purego
5
6import (
7 "reflect"
8 "syscall"
9
10 "golang.org/x/sys/windows"
11)
12
13var syscall15XABI0 uintptr
14
15func syscall_syscall15X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr) (r1, r2, err uintptr) {
16 r1, r2, errno := syscall.Syscall15(fn, 15, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15)
17 return r1, r2, uintptr(errno)
18}
19
20// NewCallback converts a Go function to a function pointer conforming to the stdcall calling convention.
21// This is useful when interoperating with Windows code requiring callbacks. The argument is expected to be a
22// function with one uintptr-sized result. The function must not have arguments with size larger than the
23// size of uintptr. Only a limited number of callbacks may be created in a single Go process, and any memory
24// allocated for these callbacks is never released. Between NewCallback and NewCallbackCDecl, at least 1024
25// callbacks can always be created. Although this function is similiar to the darwin version it may act
26// differently.
27func NewCallback(fn interface{}) uintptr {
28 isCDecl := false
29 ty := reflect.TypeOf(fn)
30 for i := 0; i < ty.NumIn(); i++ {
31 in := ty.In(i)
32 if !in.AssignableTo(reflect.TypeOf(CDecl{})) {
33 continue
34 }
35 if i != 0 {
36 panic("purego: CDecl must be the first argument")
37 }
38 isCDecl = true
39 }
40 if isCDecl {
41 return syscall.NewCallbackCDecl(fn)
42 }
43 return syscall.NewCallback(fn)
44}
45
46func loadSymbol(handle uintptr, name string) (uintptr, error) {
47 return windows.GetProcAddress(windows.Handle(handle), name)
48}