mirror of
https://github.com/hajimehoshi/ebiten.git
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c7d1d28582
This enables to remove restrictions for some functions to be called from the main thread. Updates #2423
130 lines
3.0 KiB
Go
130 lines
3.0 KiB
Go
// Copyright 2023 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !android && !ios && !js && !nintendosdk
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package ui
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import (
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"sync"
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"sync/atomic"
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"github.com/hajimehoshi/ebiten/v2/internal/glfw"
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)
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// Monitor is a wrapper around glfw.Monitor.
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type Monitor struct {
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m *glfw.Monitor
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videoMode *glfw.VidMode
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id int
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name string
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x int
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y int
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contentScale float64
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videoModeScale float64
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}
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// Name returns the monitor's name.
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func (m *Monitor) Name() string {
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return m.name
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}
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type monitors struct {
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// monitors is the monitor list cache for desktop glfw compile targets.
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// populated by 'updateMonitors' which is called on init and every
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// monitor config change event.
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monitors []*Monitor
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m sync.Mutex
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updateCalled int32
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}
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var theMonitors monitors
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func (m *monitors) append(ms []*Monitor) []*Monitor {
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if atomic.LoadInt32(&m.updateCalled) == 0 {
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panic("ui: (*monitors).update must be called before (*monitors).append is called")
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}
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m.m.Lock()
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defer m.m.Unlock()
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return append(ms, m.monitors...)
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}
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func (m *monitors) monitorFromGLFWMonitor(glfwMonitor *glfw.Monitor) *Monitor {
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m.m.Lock()
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defer m.m.Unlock()
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for _, m := range m.monitors {
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if m.m == glfwMonitor {
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return m
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}
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}
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return nil
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}
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func (m *monitors) monitorFromID(id int) *Monitor {
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m.m.Lock()
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defer m.m.Unlock()
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return m.monitors[id]
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}
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// update must be called from the main thread.
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func (m *monitors) update() {
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glfwMonitors := glfw.GetMonitors()
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newMonitors := make([]*Monitor, 0, len(glfwMonitors))
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for i, m := range glfwMonitors {
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x, y := m.GetPos()
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// TODO: Detect the update of the content scale by SetContentScaleCallback (#2343).
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contentScale := 1.0
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// Keep calling GetContentScale until the returned scale is 0 (#2051).
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// Retry this at most 5 times to avoid an infinite loop.
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for i := 0; i < 5; i++ {
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// An error can happen e.g. when entering a screensaver on Windows (#2488).
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sx, _, err := m.GetContentScale()
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if err != nil {
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continue
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}
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if sx == 0 {
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continue
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}
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contentScale = float64(sx)
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break
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}
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newMonitors = append(newMonitors, &Monitor{
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m: m,
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videoMode: m.GetVideoMode(),
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id: i,
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name: m.GetName(),
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x: x,
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y: y,
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contentScale: contentScale,
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videoModeScale: videoModeScale(m),
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})
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}
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m.m.Lock()
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m.monitors = newMonitors
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m.m.Unlock()
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atomic.StoreInt32(&m.updateCalled, 1)
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}
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