| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package windriver |
| |
| // #include "windriver.h" |
| import "C" |
| |
| import ( |
| "image" |
| "runtime" |
| |
| "golang.org/x/exp/shiny/screen" |
| ) |
| |
| // TODO(andlabs): Should the Windows API code be split into a |
| // separate package internal/winbackend so gldriver can use it too? |
| |
| // Main is called by the program's main function to run the graphical |
| // application. |
| // |
| // It calls f on the Screen, possibly in a separate goroutine, as some OS- |
| // specific libraries require being on 'the main thread'. It returns when f |
| // returns. |
| func Main(f func(screen.Screen)) { |
| if err := main(f); err != nil { |
| f(errScreen{err}) |
| } |
| } |
| |
| func main(f func(screen.Screen)) (retErr error) { |
| // It does not matter which OS thread we are on. |
| // All that matters is that we confine all UI operations |
| // to the thread that created the respective window. |
| runtime.LockOSThread() |
| |
| hr := C.initUtilityWindow() |
| if hr != C.S_OK { |
| return winerror("failed to create utility window", hr) |
| } |
| defer func() { |
| // TODO(andlabs): log an error if this fails? |
| C.DestroyWindow(C.utilityWindow) |
| // TODO(andlabs): unregister window class |
| }() |
| |
| hr = C.initWindowClass() |
| if hr != C.S_OK { |
| return winerror("failed to create Window window class", hr) |
| } |
| // TODO(andlabs): uninit |
| |
| s := newScreenImpl() |
| go f(s) |
| |
| C.mainMessagePump() |
| return nil |
| } |
| |
| // errScreen is a screen.Screen. |
| type errScreen struct { |
| err error |
| } |
| |
| func (e errScreen) NewBuffer(size image.Point) (screen.Buffer, error) { |
| return nil, e.err |
| } |
| |
| func (e errScreen) NewTexture(size image.Point) (screen.Texture, error) { |
| return nil, e.err |
| } |
| |
| func (e errScreen) NewWindow(opts *screen.NewWindowOptions) (screen.Window, error) { |
| return nil, e.err |
| } |