ebiten/internal/graphicsdriver/opengl/gl/conversions_cgo.go

// SPDX-License-Identifier: MIT

//go:build !darwin && !windows

package gl

import (
	"unsafe"
)

// #include <stdlib.h>
import "C"

// GoStr takes a null-terminated string returned by OpenGL and constructs a
// corresponding Go string.
func GoStr(cstr *byte) string {
	return C.GoString((*C.char)(unsafe.Pointer(cstr)))
}

// 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 **byte, free func()) {
	if len(strs) == 0 {
		panic("gl: expected at least 1 string at Strs")
	}

	css := make([]*byte, 0, len(strs))
	for _, str := range strs {
		cs := C.CString(str)
		css = append(css, (*byte)(unsafe.Pointer(cs)))
	}

	return (**byte)(&css[0]), func() {
		for _, cs := range css {
			C.free(unsafe.Pointer(cs))
		}
	}
}