130 lines
2.1 KiB
Go
130 lines
2.1 KiB
Go
package platform
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import (
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"errors"
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"runtime"
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"github.com/go-gl/gl/v2.1/gl"
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"github.com/veandco/go-sdl2/sdl"
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)
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var (
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ErrAlreadyInit = errors.New("platform is already initialized")
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ErrWasNotInit = errors.New("platform was not initialized")
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)
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var singleton struct {
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isInit bool
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windows []*Window
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}
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type Handle uintptr
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type Scene interface {
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Init(window *Window) error
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Advance(window *Window) error
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Shutdown(window *Window) error
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}
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func Init() error {
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if singleton.isInit {
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return ErrAlreadyInit
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}
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runtime.LockOSThread()
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if err := sdl.Init(sdl.INIT_VIDEO); err != nil {
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return err
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}
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if err := gl.Init(); err != nil {
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return err
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}
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singleton.isInit = true
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return nil
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}
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func Advance() (bool, error) {
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if !singleton.isInit {
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return false, ErrWasNotInit
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}
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advanceWindows()
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for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
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switch event.(type) {
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case *sdl.QuitEvent:
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return false, nil
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default:
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if err := processWindowEvents(event); err != nil {
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return false, err
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}
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}
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}
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return true, nil
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}
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func Shutdown() error {
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if !singleton.isInit {
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return ErrWasNotInit
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}
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for _, w := range singleton.windows {
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if err := w.Destroy(); err != nil {
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return err
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}
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}
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singleton.windows = nil
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singleton.isInit = false
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return nil
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}
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func CreateWindow(title string, width, height int, scene Scene) (*Window, error) {
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if !singleton.isInit {
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return nil, ErrWasNotInit
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}
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w, err := newWindow(title, width, height, scene)
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if err != nil {
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return nil, err
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}
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appendWindow(w)
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return w, err
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}
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func appendWindow(window *Window) {
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singleton.windows = append(singleton.windows, window)
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}
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func removeWindow(window *Window) bool {
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for i, w := range singleton.windows {
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if w == window {
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singleton.windows = append(singleton.windows[:i], singleton.windows[i+1:]...)
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return true
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}
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}
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return false
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}
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func advanceWindows() {
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for _, window := range singleton.windows {
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window.advance()
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}
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}
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func processWindowEvents(event sdl.Event) error {
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for _, window := range singleton.windows {
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if _, err := window.processEvent(event); err != nil {
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return err
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}
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}
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return nil
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}
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