zorldo

Goofing around with Ebiten
git clone git://bsandro.tech/zorldo
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impl_js.go (955B)


      1 // Copyright 2018 The Ebiten Authors
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //     http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 package devicescale
     16 
     17 import (
     18 	"syscall/js"
     19 )
     20 
     21 func impl(x, y int) float64 {
     22 	if go2cpp := js.Global().Get("go2cpp"); go2cpp.Truthy() {
     23 		return go2cpp.Get("devicePixelRatio").Float()
     24 	}
     25 
     26 	window := js.Global().Get("window")
     27 	if !window.Truthy() {
     28 		return 1
     29 	}
     30 	ratio := window.Get("devicePixelRatio").Float()
     31 	if ratio == 0 {
     32 		ratio = 1
     33 	}
     34 	return ratio
     35 }