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graphicsdriver/opengl: Leave comments why we don't use PBO on Android

Browse Source 
Unfotunately, PBO might slow Android applications expecially when
coming back from context lost. Ebiten sends a lot of draw calls to
replace pixels in such case.

Until we find a good solution, let's not use PBO on Android.

Fixes #988
This commit is contained in:
Hajime Hoshi 2020-01-19 16:10:49 +09:00
parent bfa7e42368
commit 59431e1cad
3 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
go.mod
View File

@ -14,8 +14,8 @@ require (
github.com/jfreymuth/vorbis v1.0.0 // indirect
github.com/kr/pretty v0.1.0 // indirect
golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
golang.org/x/mobile v0.0.0-20191025110607-73ccc5ba0426
golang.org/x/mobile v0.0.0-20200119070023-0c13fd316633
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037
golang.org/x/tools v0.0.0-20191026034945-b2104f82a97d
golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
)

15
go.sum
View File

@ -26,6 +26,7 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4/go.mod h1:4OwLy04Bl9Ef3GJJCoec+30X3LQs/0/m4HFRt/2LUSA=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 h1:estk1glOnSVeJ9tdEZZc5mAMDZk5lNJNyJ6DvrBkTEU=
golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56/go.mod h1:JhuoJpWY28nO4Vef9tZUw9qufEGTyX1+7lmHxV5q5G4=
@ -36,9 +37,11 @@ golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 h1:hVwzHzIUGRjiF7EcUjqNxk3
golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
golang.org/x/mobile v0.0.0-20190415191353-3e0bab5405d6/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
golang.org/x/mobile v0.0.0-20191025110607-73ccc5ba0426 h1:8RjY2wWN6kjy6JvJjDPT51tx4ht4+ldy/a5Yw0AyEr4=
golang.org/x/mobile v0.0.0-20191025110607-73ccc5ba0426/go.mod h1:p895TfNkDgPEmEQrNiOtIl3j98d/tGU95djDj7NfyjQ=
golang.org/x/mobile v0.0.0-20200119070023-0c13fd316633 h1:TTjgkwwZm6Oiwbjs8Kbc2pyIbLaSxC19uURGsZsLz3s=
golang.org/x/mobile v0.0.0-20200119070023-0c13fd316633/go.mod h1:xVnulspMBrznVIwB4CQrGc712u7ETbNKUJ+GCqGLaEc=
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/mod v0.1.1-0.20191209134235-331c550502dd/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@ -52,9 +55,11 @@ golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190909214602-067311248421/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20191026034945-b2104f82a97d h1:QFO0Wgcqcp8nI9hbisKDTBsmfwrvLswk2T73QDZZgVo=
golang.org/x/tools v0.0.0-20191026034945-b2104f82a97d/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e h1:aZzprAO9/8oim3qStq3wc1Xuxx4QmAGriC4VU4ojemQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9 h1:KOkk4e2xd5OeCDJGwacvr75ICCbCsShrHiqPEdsA9hg=
golang.org/x/tools v0.0.0-20200117220505-0cba7a3a9ee9/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

8
internal/graphicsdriver/opengl/context_mobile.go
View File

@ -389,8 +389,8 @@ func (c *context) needsRestoring() bool {
}
func (c *context) canUsePBO() bool {
// The implementation for PBO is almost done, but not finished yet due to Go mobile interface.
// See golang/go#36355.
// On Android, using PBO might slow the applications, especially when coming back from the context lost.
// Let's not use PBO until we find a good solution.
return false
}
@ -412,6 +412,8 @@ func (c *context) newPixelBufferObject(width, height int) buffer {
}
func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
// This implementation is not used yet so far. See the comment at canUsePBO.
c.bindTexture(t)
gl := c.gl
gl.BindBuffer(mgl.PIXEL_UNPACK_BUFFER, mgl.Buffer(buffer))
@ -424,8 +426,6 @@ func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, he
}
}
// This implementation is still wrong since TexSubImage2D cannot take an offset integer.
// See golang/go#36355.
gl.TexSubImage2D(mgl.TEXTURE_2D, 0, 0, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE, nil)
gl.BindBuffer(mgl.PIXEL_UNPACK_BUFFER, mgl.Buffer{0})
}