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load_windows.go
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load_windows.go
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// Copyright 2018 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package glfw
import (
"bytes"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"os"
"unsafe"
"golang.org/x/sys/windows"
)
type dll struct {
d *windows.LazyDLL
path string
procs map[string]*windows.LazyProc
}
func (d *dll) call(name string, args ...uintptr) uintptr {
if d.procs == nil {
d.procs = map[string]*windows.LazyProc{}
}
if _, ok := d.procs[name]; !ok {
d.procs[name] = d.d.NewProc(name)
}
r, _, err := d.procs[name].Call(args...)
if err != nil && err.(windows.Errno) != 0 {
// It looks like there is no way to handle these errors?
// panic(fmt.Sprintf("glfw: calling proc error: errno: %d (%s)", err, err.Error()))
}
return r
}
func createTempDLL(content io.Reader) (string, error) {
f, err := ioutil.TempFile("", "glfw.*.dll")
if err != nil {
return "", err
}
defer f.Close()
fn := f.Name()
if _, err := io.Copy(f, content); err != nil {
return "", err
}
return fn, nil
}
func loadDLL() (*dll, error) {
f, err := gzip.NewReader(bytes.NewReader(glfwDLLCompressed))
if err != nil {
return nil, err
}
defer f.Close()
fn, err := createTempDLL(f)
if err != nil {
return nil, err
}
return &dll{
d: windows.NewLazyDLL(fn),
path: fn,
}, nil
}
func (d *dll) unload() error {
if err := windows.FreeLibrary(windows.Handle(d.d.Handle())); err != nil {
return err
}
if err := os.Remove(d.path); err != nil {
return err
}
return nil
}
func uintptrToString(ptr uintptr) string {
var bs []byte
for {
b := *(*byte)(unsafe.Pointer(ptr))
if b == 0 {
break
}
bs = append(bs, b)
ptr++
}
return string(bs)
}
type glfwError struct {
code ErrorCode
desc string
}
func (e *glfwError) Error() string {
return fmt.Sprintf("glfw: %s: %s", e.code.String(), e.desc)
}
var lastErr = make(chan *glfwError, 1)
func fetchError() error {
select {
case err := <-lastErr:
return err
default:
return nil
}
}
func panicError() {
if err := acceptError(); err != nil {
panic(err)
}
}
func flushErrors() {
if err := fetchError(); err != nil {
panic(fmt.Sprintf("glfw: uncaught error: %s", err))
}
}
func acceptError(codes ...ErrorCode) error {
err := fetchError()
if err == nil {
return nil
}
for _, c := range codes {
if err.(*glfwError).code == c {
return nil
}
}
if err.(*glfwError).code == PlatformError {
// PlatformError is not handled here (See github.com/go-gl/glfw's implementation).
// TODO: Should we log this error?
return nil
}
return err
}
func goGLFWErrorCallback(code uintptr, desc uintptr) uintptr {
flushErrors()
err := &glfwError{
code: ErrorCode(code),
desc: uintptrToString(desc),
}
select {
case lastErr <- err:
default:
panic(fmt.Sprintf("glfw: uncaught error: %s", err))
}
return 0
}
var glfwDLL *dll
func init() {
dll, err := loadDLL()
if err != nil {
panic(err)
}
glfwDLL = dll
glfwDLL.call("glfwSetErrorCallback", windows.NewCallbackCDecl(goGLFWErrorCallback))
}