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Windows DPI awareness

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This commit is contained in:
bloeys
2023-02-04 04:42:38 +04:00
parent c6ab25ba41
commit a2ee354d77
6 changed files with 116 additions and 2 deletions
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42
main.go
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@ -115,6 +115,9 @@ const (
// How many lines to move per scroll
defaultScrollSpd = 1
unscaledWindowWidth = 1280
unscaledWindowHeight = 720
)
var (
@ -137,8 +140,11 @@ func main() {
panic("Failed to init engine. Err: " + err.Error())
}
// This scaling lets us respect the user's request for zoomed-in programs
dpiScaling := getDpiScaling()
rend := rend3dgl.NewRend3DGL()
win, err := engine.CreateOpenGLWindowCentered("nTerm", 1280, 720, engine.WindowFlags_ALLOW_HIGHDPI|engine.WindowFlags_RESIZABLE, rend)
win, err := engine.CreateOpenGLWindowCentered("nTerm", int32(unscaledWindowWidth*dpiScaling), int32(unscaledWindowHeight*dpiScaling), engine.WindowFlags_ALLOW_HIGHDPI|engine.WindowFlags_RESIZABLE, rend)
if err != nil {
panic("Failed to create window. Err: " + err.Error())
}
@ -197,6 +203,40 @@ func main() {
}
}
func getDpiScaling() float32 {
// Great read on DPI here: https://nlguillemot.wordpress.com/2016/12/11/high-dpi-rendering/
// The no-scaling DPI on different platforms (e.g. when scale=100% on windows)
var defaultDpi float32 = 96
if runtime.GOOS == "windows" {
defaultDpi = 96
} else if runtime.GOOS == "darwin" {
defaultDpi = 72
}
// Current DPI of the monitor
_, dpiHorizontal, _, err := sdl.GetDisplayDPI(0)
if err != nil {
dpiHorizontal = defaultDpi
fmt.Printf("Failed to get DPI with error '%s'. Using default DPI of '%f'\n", err.Error(), defaultDpi)
}
// Scaling factor (e.g. will be 1.25 for 125% scaling on windows)
dpiScaling := dpiHorizontal / defaultDpi
fmt.Printf(
"Default DPI=%f\nHorizontal DPI=%f\nDPI scaling=%f\nUnscaled window size (width, height)=(%d, %d)\nScaled window size (width, height)=(%d, %d)\n\n",
defaultDpi,
dpiHorizontal,
dpiScaling,
unscaledWindowWidth, unscaledWindowHeight,
int32(unscaledWindowWidth*dpiScaling), int32(unscaledWindowHeight*dpiScaling),
)
return dpiScaling
}
func (nt *nterm) handleSDLEvent(e sdl.Event) {
switch e := e.(type) {