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ui_unix.go
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ui_unix.go
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// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build (dragonfly || freebsd || linux || netbsd || openbsd || solaris) && !android
// +build dragonfly freebsd linux netbsd openbsd solaris
// +build !android
package glfw
import (
"fmt"
"math"
"runtime"
"github.com/hajimehoshi/ebiten/v2/internal/driver"
"github.com/hajimehoshi/ebiten/v2/internal/glfw"
"github.com/jezek/xgb"
"github.com/jezek/xgb/randr"
"github.com/jezek/xgb/xproto"
)
type videoModeScaleCacheKey struct{ X, Y int }
var videoModeScaleCache = map[videoModeScaleCacheKey]float64{}
// clearVideoModeScaleCache must be called from the main thread.
func clearVideoModeScaleCache() {
for k := range videoModeScaleCache {
delete(videoModeScaleCache, k)
}
}
// videoModeScale must be called from the main thread.
func videoModeScale(m *glfw.Monitor) float64 {
// Caching wrapper for videoModeScaleUncached as
// videoModeScaleUncached may be expensive (uses blocking calls on X connection)
// and public ScreenSizeInFullscreen API needs the videoModeScale.
monitorX, monitorY := m.GetPos()
cacheKey := videoModeScaleCacheKey{X: monitorX, Y: monitorY}
if cached, ok := videoModeScaleCache[cacheKey]; ok {
return cached
}
scale := videoModeScaleUncached(m, monitorX, monitorY)
videoModeScaleCache[cacheKey] = scale
return scale
}
// videoModeScaleUncached must be called from the main thread.
func videoModeScaleUncached(m *glfw.Monitor, monitorX, monitorY int) float64 {
// TODO: if glfw/glfw#1961 gets fixed, this function may need revising.
// In case GLFW decides to switch to returning logical pixels, we can just return 1.
// Note: GLFW currently returns physical pixel sizes,
// but we need to predict the window system-side size of the fullscreen window
// for Ebiten's `ScreenSizeInFullscreen` public API.
// Also at the moment we need this prior to switching to fullscreen, but that might be replacable.
// So this function computes the ratio of physical per logical pixels.
xconn, err := xgb.NewConn()
if err != nil {
// No X11 connection?
// Assume we're on pure Wayland then.
// GLFW/Wayland shouldn't be having this issue.
return 1
}
defer xconn.Close()
if err = randr.Init(xconn); err != nil {
// No RANDR extension? No problem.
return 1
}
root := xproto.Setup(xconn).DefaultScreen(xconn).Root
res, err := randr.GetScreenResourcesCurrent(xconn, root).Reply()
if err != nil {
// Likely means RANDR is not working. No problem.
return 1
}
for _, crtc := range res.Crtcs[:res.NumCrtcs] {
info, err := randr.GetCrtcInfo(xconn, crtc, res.ConfigTimestamp).Reply()
if err != nil {
// This Crtc is bad. Maybe just got disconnected?
continue
}
if info.NumOutputs == 0 {
// This Crtc is not connected to any output.
// In other words, a disabled monitor.
continue
}
if int(info.X) == monitorX && int(info.Y) == monitorY {
xWidth, xHeight := info.Width, info.Height
vm := m.GetVideoMode()
physWidth, physHeight := vm.Width, vm.Height
// Return one scale, even though there may be separate X and Y scales.
// Return the _larger_ scale, as this would yield a letterboxed display on mismatch, rather than a cut-off one.
scale := math.Max(float64(physWidth)/float64(xWidth), float64(physHeight)/float64(xHeight))
return scale
}
}
// Monitor not known to XRandR. Weird.
return 1
}
// fromGLFWMonitorPixel must be called from the main thread.
func (u *UserInterface) fromGLFWMonitorPixel(x float64, videoModeScale float64) float64 {
return x / (videoModeScale * u.deviceScaleFactor())
}
// fromGLFWPixel must be called from the main thread.
func (u *UserInterface) fromGLFWPixel(x float64) float64 {
return x / u.deviceScaleFactor()
}
// toGLFWPixel must be called from the main thread.
func (u *UserInterface) toGLFWPixel(x float64) float64 {
return x * u.deviceScaleFactor()
}
func (u *UserInterface) adjustWindowPosition(x, y int) (int, int) {
return x, y
}
func currentMonitorByOS(_ *glfw.Window) *glfw.Monitor {
// TODO: Implement this correctly. (#1119).
return nil
}
func (u *UserInterface) nativeWindow() uintptr {
// TODO: Implement this.
return 0
}
func (u *UserInterface) isNativeFullscreen() bool {
return false
}
func (u *UserInterface) setNativeCursor(shape driver.CursorShape) {
// TODO: Use native API in the future (#1571)
u.window.SetCursor(glfwSystemCursors[shape])
}
func (u *UserInterface) isNativeFullscreenAvailable() bool {
return false
}
func (u *UserInterface) setNativeFullscreen(fullscreen bool) {
panic(fmt.Sprintf("glfw: setNativeFullscreen is not implemented in this environment: %s", runtime.GOOS))
}
func (u *UserInterface) adjustViewSize() {
}