ebiten/ui/cocoa/window.go

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package cocoa
// #include <stdlib.h>
//
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// #include "input.h"
//
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// void* CreateWindow(size_t width, size_t height, const char* title, void* glContext);
// void* CreateGLContext(void* sharedGLContext);
//
// void* GetGLContext(void* window);
// void UseGLContext(void* glContext);
// void UnuseGLContext(void);
//
import "C"
import (
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"github.com/hajimehoshi/go-ebiten/graphics"
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"github.com/hajimehoshi/go-ebiten/graphics/opengl"
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"github.com/hajimehoshi/go-ebiten/ui"
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"runtime"
"unsafe"
)
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type Window struct {
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ui *cocoaUI
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screenWidth int
screenHeight int
screenScale int
closed bool
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native unsafe.Pointer
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pressedKeys map[ui.Key]struct{}
context *opengl.Context
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funcs chan func()
funcsDone chan struct{}
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events chan interface{}
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}
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var windows = map[unsafe.Pointer]*Window{}
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func runWindow(cocoaUI *cocoaUI, width, height, scale int, title string, sharedContext unsafe.Pointer) *Window {
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w := &Window{
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ui: cocoaUI,
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screenWidth: width,
screenHeight: height,
screenScale: scale,
closed: false,
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pressedKeys: map[ui.Key]struct{}{},
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funcs: make(chan func()),
funcsDone: make(chan struct{}),
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}
cTitle := C.CString(title)
defer C.free(unsafe.Pointer(cTitle))
ch := make(chan struct{})
go func() {
runtime.LockOSThread()
glContext := C.CreateGLContext(sharedContext)
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w.native = C.CreateWindow(C.size_t(width*scale),
C.size_t(height*scale),
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cTitle,
glContext)
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windows[w.native] = w
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close(ch)
w.loop()
}()
<-ch
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w.useGLContext(func() {
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w.context = w.ui.graphicsDevice.CreateContext(width, height, scale)
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})
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return w
}
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func (w *Window) loop() {
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for {
select {
case f := <-w.funcs:
glContext := C.GetGLContext(w.native)
C.UseGLContext(glContext)
f()
C.UnuseGLContext()
w.funcsDone <- struct{}{}
}
}
}
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func (w *Window) Draw(f func(graphics.Context)) {
if w.closed {
return
}
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w.useGLContext(func() {
w.ui.graphicsDevice.Update(w.context, f)
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})
}
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func (w *Window) useGLContext(f func()) {
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w.funcs <- f
<-w.funcsDone
}
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func (w *Window) Events() <-chan interface{} {
if w.events != nil {
return w.events
}
w.events = make(chan interface{})
return w.events
}
func (w *Window) notify(e interface{}) {
if w.events == nil {
return
}
go func() {
w.events <- e
}()
}
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// Now this function is not used anywhere.
//export ebiten_WindowSizeUpdated
func ebiten_WindowSizeUpdated(nativeWindow unsafe.Pointer, width, height int) {
w := windows[nativeWindow]
e := ui.WindowSizeUpdatedEvent{width, height}
w.notify(e)
}
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func (w *Window) keyStateUpdatedEvent() ui.KeyStateUpdatedEvent {
keys := []ui.Key{}
for key, _ := range w.pressedKeys {
keys = append(keys, key)
}
return ui.KeyStateUpdatedEvent{
Keys: keys,
}
}
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var cocoaKeyCodeToKey = map[int]ui.Key{
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49: ui.KeySpace,
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123: ui.KeyLeft,
124: ui.KeyRight,
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125: ui.KeyDown,
126: ui.KeyUp,
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}
//export ebiten_KeyDown
func ebiten_KeyDown(nativeWindow unsafe.Pointer, keyCode int) {
key, ok := cocoaKeyCodeToKey[keyCode]
if !ok {
return
}
w := windows[nativeWindow]
w.pressedKeys[key] = struct{}{}
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w.notify(w.keyStateUpdatedEvent())
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}
//export ebiten_KeyUp
func ebiten_KeyUp(nativeWindow unsafe.Pointer, keyCode int) {
key, ok := cocoaKeyCodeToKey[keyCode]
if !ok {
return
}
w := windows[nativeWindow]
delete(w.pressedKeys, key)
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w.notify(w.keyStateUpdatedEvent())
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}
//export ebiten_MouseStateUpdated
func ebiten_MouseStateUpdated(nativeWindow unsafe.Pointer, inputType C.InputType, cx, cy C.int) {
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w := windows[nativeWindow]
if inputType == C.InputTypeMouseUp {
e := ui.MouseStateUpdatedEvent{-1, -1}
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w.notify(e)
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return
}
x, y := int(cx), int(cy)
x /= w.screenScale
y /= w.screenScale
if x < 0 {
x = 0
} else if w.screenWidth <= x {
x = w.screenWidth - 1
}
if y < 0 {
y = 0
} else if w.screenHeight <= y {
y = w.screenHeight - 1
}
e := ui.MouseStateUpdatedEvent{x, y}
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w.notify(e)
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}
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//export ebiten_WindowClosed
func ebiten_WindowClosed(nativeWindow unsafe.Pointer) {
w := windows[nativeWindow]
w.closed = true
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w.notify(ui.WindowClosedEvent{})
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delete(windows, nativeWindow)
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}