ebiten/ui/glfw/canvas.go
2014-12-06 03:10:17 +09:00

97 lines
2.0 KiB
Go

package glfw
import (
glfw "github.com/go-gl/glfw3"
"github.com/hajimehoshi/ebiten/graphics"
"github.com/hajimehoshi/ebiten/graphics/opengl"
"github.com/hajimehoshi/ebiten/ui"
"image"
"runtime"
)
type Canvas struct {
window *glfw.Window
inputState *InputState
context *opengl.Context
funcs chan func()
funcsDone chan struct{}
}
func NewCanvas(width, height, scale int, title string) *Canvas {
window, err := glfw.CreateWindow(width*scale, height*scale, title, nil, nil)
if err != nil {
panic(err)
}
canvas := &Canvas{
window: window,
inputState: newInputState(),
funcs: make(chan func()),
funcsDone: make(chan struct{}),
}
// For retina displays, recalculate the scale with the framebuffer size.
windowWidth, _ := window.GetFramebufferSize()
realScale := windowWidth / width
canvas.run()
canvas.use(func() {
canvas.context = opengl.NewContext(width, height, realScale)
})
return canvas
}
func (c *Canvas) Draw(f func(graphics.Context)) {
c.use(func() {
c.context.Update(f)
c.window.SwapBuffers()
})
}
func (c *Canvas) IsClosed() bool {
return c.window.ShouldClose()
}
func (c *Canvas) InputState() ui.InputState {
return c.inputState
}
func (c *Canvas) CreateTexture(img image.Image, filter graphics.Filter) (graphics.TextureId, error) {
var id graphics.TextureId
var err error
c.use(func() {
id, err = opengl.CreateTexture(img, filter)
})
return id, err
}
func (c *Canvas) CreateRenderTarget(width, height int, filter graphics.Filter) (graphics.RenderTargetId, error) {
var id graphics.RenderTargetId
var err error
c.use(func() {
id, err = opengl.CreateRenderTarget(width, height, filter)
})
return id, err
}
func (c *Canvas) run() {
go func() {
runtime.LockOSThread()
c.window.MakeContextCurrent()
glfw.SwapInterval(1)
for {
f := <-c.funcs
f()
c.funcsDone <- struct{}{}
}
}()
}
func (c *Canvas) use(f func()) {
c.funcs <- f
<-c.funcsDone
}
func (c *Canvas) update() {
c.inputState.update(c.window)
}