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graphics: Bug fix: Don't adjust texels on iOS Safari

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This commit is contained in:
Hajime Hoshi 2017-10-03 02:34:16 +09:00
parent d1333e92a5
commit 9399622127
3 changed files with 19 additions and 5 deletions
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4
internal/web/js.go
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@ -26,7 +26,7 @@ func IsBrowser() bool {
return true
}
func isIOS() bool {
func IsIOSSafari() bool {
ua := js.Global.Get("navigator").Get("userAgent").String()
if !strings.Contains(ua, "iPhone") {
return false
@ -46,5 +46,5 @@ func isAndroidChrome() bool {
}
func IsMobileBrowser() bool {
return isIOS() || isAndroidChrome()
return IsIOSSafari() || isAndroidChrome()
}

4
internal/web/notjs.go
View File

@ -20,6 +20,10 @@ func IsBrowser() bool {
return false
}
func IsIOSSafari() bool {
return false
}
func IsMobileBrowser() bool {
return false
}

16
vertices.go
View File

@ -17,13 +17,21 @@ package ebiten
import (
"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/restorable"
"github.com/hajimehoshi/ebiten/internal/web"
)
// texelAdjustment represents a number to be used to adjust texel.
// Texels are adjusted by amount propotional to inverse of texelAdjustment.
// This is necessary not to use unexpected pixels outside of texels.
// See #317.
const texelAdjustment = 256
var texelAdjustment float32 = 256
func init() {
if web.IsIOSSafari() {
// Texel adjustment causes glitches on iOS Safari.
texelAdjustment = 0
}
}
var (
quadFloat32Num = restorable.QuadVertexSizeInBytes() / 4
@ -75,8 +83,10 @@ func vertices(sx0, sy0, sx1, sy1 int, width, height int, geo *affine.GeoM) []flo
x0, y0, x1, y1 := float32(0), float32(0), float32(sx1-sx0), float32(sy1-sy0)
u0, v0, u1, v1 := float32(sx0)/wf, float32(sy0)/hf, float32(sx1)/wf, float32(sy1)/hf
// Adjust texels to fix a problem that outside texels are used (#317).
u1 -= 1.0 / wf / texelAdjustment
v1 -= 1.0 / hf / texelAdjustment
if texelAdjustment > 0 {
u1 -= 1.0 / wf / texelAdjustment
v1 -= 1.0 / hf / texelAdjustment
}
vs[0] = x0
vs[1] = y0
vs[2] = u0