ebiten/internal/graphicsdriver/opengl/gl/conversions_windows.go
2021-06-13 14:19:33 +09:00

52 lines
1.1 KiB
Go

// SPDX-License-Identifier: MIT
package gl
import (
"runtime"
"strings"
"unsafe"
)
// GoStr takes a null-terminated string returned by OpenGL and constructs a
// corresponding Go string.
func GoStr(cstr *uint8) string {
str := ""
for {
if *cstr == 0 {
break
}
str += string(*cstr)
cstr = (*uint8)(unsafe.Pointer(uintptr(unsafe.Pointer(cstr)) + 1))
}
return str
}
// Strs takes a list of Go strings (with or without null-termination) and
// returns their C counterpart.
//
// The returned free function must be called once you are done using the strings
// in order to free the memory.
//
// If no strings are provided as a parameter this function will panic.
func Strs(strs ...string) (cstrs **uint8, free func()) {
if len(strs) == 0 {
panic("Strs: expected at least 1 string")
}
var pinned []string
var ptrs []*uint8
for _, str := range strs {
if !strings.HasSuffix(str, "\x00") {
str += "\x00"
}
pinned = append(pinned, str)
ptrs = append(ptrs, Str(str))
}
return &ptrs[0], func() {
runtime.KeepAlive(pinned)
pinned = nil
}
}