mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
138 lines
2.8 KiB
Go
138 lines
2.8 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package glfw
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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type dll struct {
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d *windows.LazyDLL
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procs map[string]*windows.LazyProc
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}
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func (d *dll) call(name string, args ...uintptr) uintptr {
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if d.procs == nil {
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d.procs = map[string]*windows.LazyProc{}
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}
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if _, ok := d.procs[name]; !ok {
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d.procs[name] = d.d.NewProc(name)
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}
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// It looks like there is no way to handle Windows errors correctly.
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r, _, _ := d.procs[name].Call(args...)
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return r
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}
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func (d *dll) unload() error {
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if err := windows.FreeLibrary(windows.Handle(d.d.Handle())); err != nil {
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return err
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}
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return nil
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}
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func bytePtrToString(ptr *byte) string {
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var bs []byte
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for i := uintptr(0); ; i++ {
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b := *(*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(ptr)) + i))
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if b == 0 {
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break
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}
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bs = append(bs, b)
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}
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return string(bs)
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}
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type glfwError struct {
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code ErrorCode
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desc string
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}
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func (e *glfwError) Error() string {
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return fmt.Sprintf("glfw: %s: %s", e.code.String(), e.desc)
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}
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var lastErr = make(chan *glfwError, 1)
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func fetchError() *glfwError {
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select {
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case err := <-lastErr:
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return err
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default:
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return nil
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}
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}
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func panicError() {
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if err := acceptError(); err != nil {
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panic(err)
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}
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}
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func flushErrors() {
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if err := fetchError(); err != nil {
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panic(fmt.Sprintf("glfw: uncaught error: %s", err.Error()))
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}
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}
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func acceptError(codes ...ErrorCode) error {
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err := fetchError()
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if err == nil {
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return nil
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}
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for _, c := range codes {
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if err.code == c {
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return err
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}
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}
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switch err.code {
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case PlatformError:
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// TODO: Should we log this?
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return nil
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case NotInitialized, NoCurrentContext, InvalidEnum, InvalidValue, OutOfMemory:
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panic(err)
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default:
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panic(fmt.Sprintf("glfw: uncaught error: %s", err.Error()))
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}
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}
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func goGLFWErrorCallback(code uintptr, desc *byte) uintptr {
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flushErrors()
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err := &glfwError{
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code: ErrorCode(code),
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desc: bytePtrToString(desc),
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}
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select {
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case lastErr <- err:
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default:
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panic(fmt.Sprintf("glfw: uncaught error: %s", err.Error()))
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}
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return 0
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}
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var glfwDLL *dll
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func init() {
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dll, err := loadDLL()
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if err != nil {
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panic(err)
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}
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glfwDLL = dll
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glfwDLL.call("glfwSetErrorCallback", windows.NewCallbackCDecl(goGLFWErrorCallback))
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}
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