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app.go
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app.go
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package main
import (
"fmt"
"log"
"time"
"github.com/g3n/engine/audio/al"
"github.com/g3n/engine/audio/vorbis"
)
type Application struct {
audioDev *al.Device
start time.Time
frame time.Time
delta time.Duration
Delay time.Duration
Close bool
Nodes []Node
UI *UI
}
type Node interface {
Update(dt time.Duration)
Destroy()
Render(*UI) string
}
func NewApplication() Application {
a := Application{}
if a.audioDev == nil { a.openDefaultAudioDevice() }
if a.UI == nil { a.UI = &UI{}; a.UI.Init() }
return a
}
func (a *Application) Run(update func(dt time.Duration)) {
a.start = time.Now()
a.frame = time.Now()
for {
now := time.Now()
a.delta = now.Sub(a.frame)
a.start = now
update(a.delta)
a.UI.Nodes = []string{}
for _, n := range(a.Nodes) {
n.Update(a.delta)
a.UI.Nodes = append(a.UI.Nodes, n.Render(a.UI))
}
if a.Close { break }
a.UI.Render()
time.Sleep(a.Delay)
}
if a.audioDev != nil { al.CloseDevice(a.audioDev) }
a.Destroy()
}
func (a *Application) Exit() {
a.Close = true
}
func (a *Application) Destroy() {
for _, n := range(a.Nodes) { n.Destroy() }
}
func (a *Application) AddNode(node Node) {
a.Nodes = append(a.Nodes, node)
}
// Source: https://github.com/g3n/engine/blob/master/app/app-desktop.go
// Copyright (c) 2016 The G3N Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
func (a *Application) openDefaultAudioDevice() error {
// Opens default audio device
var err error
a.audioDev, err = al.OpenDevice("")
if err != nil {
return fmt.Errorf("opening OpenAL default device: %s", err)
}
// Check for OpenAL effects extension support
var attribs []int
if al.IsExtensionPresent("ALC_EXT_EFX") {
attribs = []int{al.MAX_AUXILIARY_SENDS, 4}
}
// Create audio context
acx, err := al.CreateContext(a.audioDev, attribs)
if err != nil {
return fmt.Errorf("creating OpenAL context: %s", err)
}
// Makes the context the current one
err = al.MakeContextCurrent(acx)
if err != nil {
return fmt.Errorf("setting OpenAL context current: %s", err)
}
// Logs audio library versions
log.Printf("%s version: %s", al.GetString(al.Vendor), al.GetString(al.Version))
log.Printf("%s", vorbis.VersionString())
return nil
}