1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
3
4package purego
5
6import (
7 "syscall"
8 _ "unsafe" // only for go:linkname
9
10 "golang.org/x/sys/windows"
11)
12
13var syscall9XABI0 uintptr
14
15type syscall9Args struct {
16 fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr
17 f1, f2, f3, f4, f5, f6, f7, f8 uintptr
18 r1, r2, err uintptr
19}
20
21func syscall_syscall9X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
22 r1, r2, errno := syscall.Syscall9(fn, 9, a1, a2, a3, a4, a5, a6, a7, a8, a9)
23 return r1, r2, uintptr(errno)
24}
25
26// NewCallback converts a Go function to a function pointer conforming to the stdcall calling convention.
27// This is useful when interoperating with Windows code requiring callbacks. The argument is expected to be a
28// function with one uintptr-sized result. The function must not have arguments with size larger than the
29// size of uintptr. Only a limited number of callbacks may be created in a single Go process, and any memory
30// allocated for these callbacks is never released. Between NewCallback and NewCallbackCDecl, at least 1024
31// callbacks can always be created. Although this function is similiar to the darwin version it may act
32// differently.
33func NewCallback(fn interface{}) uintptr {
34 return syscall.NewCallback(fn)
35}
36
37//go:linkname openLibrary openLibrary
38func openLibrary(name string) (uintptr, error) {
39 handle, err := windows.LoadLibrary(name)
40 return uintptr(handle), err
41}
42
43func loadSymbol(handle uintptr, name string) (uintptr, error) {
44 return windows.GetProcAddress(windows.Handle(handle), name)
45}