68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
//go:build !cgo && (freebsd || linux)
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package rl
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import (
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"fmt"
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"runtime"
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"unsafe"
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"github.com/ebitengine/purego"
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"golang.org/x/sys/unix"
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)
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const (
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libname = "libraylib.so"
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requiredVersion = "5.0"
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)
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var vsprintf uintptr
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func init() {
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var filename string
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switch runtime.GOOS {
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case "linux":
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filename = "libc.so.6"
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case "freebsd":
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filename = "libc.so.7"
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}
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handle, err := purego.Dlopen(filename, purego.RTLD_LAZY)
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if err == nil {
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vsprintf, _ = purego.Dlsym(handle, "vsprintf")
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}
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}
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// loadLibrary loads the raylib dll and panics on error
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func loadLibrary() uintptr {
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handle, err := purego.Dlopen(libname, purego.RTLD_LAZY)
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if err != nil {
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panic(fmt.Errorf("cannot load library %s: %w", libname, err))
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}
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proc, err := purego.Dlsym(handle, "raylib_version")
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if err != nil {
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panic(err)
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}
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version := unix.BytePtrToString(**(***byte)(unsafe.Pointer(&proc)))
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if version != requiredVersion {
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panic(fmt.Errorf("version %s of %s doesn't match the required version %s", version, libname, requiredVersion))
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}
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return uintptr(handle)
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}
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func traceLogCallbackWrapper(fn TraceLogCallbackFun) uintptr {
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return purego.NewCallback(func(logLevel int32, text *byte, args unsafe.Pointer) uintptr {
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if vsprintf != 0 {
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var buffer [256]byte // As defined in utils.c from raylib
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_, _, errno := purego.SyscallN(vsprintf, uintptr(unsafe.Pointer(&buffer[0])), uintptr(unsafe.Pointer(text)), uintptr(args))
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if errno == 0 {
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text = &buffer[0]
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}
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}
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fn(int(logLevel), unix.BytePtrToString(text))
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return 0
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})
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}
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