Platform/GFX/OffMainThreadCompositing: Difference between revisions

Platform/GFX/OffMainThreadCompositing (view source)

Revision as of 22:53, 21 August 2012

1,274 bytes added , 21 August 2012

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Ncameron

13

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 =Plan=
-Our highest priority platform for this project has been Android, but we want to extend this to all supported platforms: Mac, Windows (D3D9 + D3D10), Linux, B2G (Gonk) and software-only (BasicLayers).
+Our highest priority platform for this project has been Android, but we want to extend this to all supported platforms: Mac, Windows (D3D9 + D3D10), Linux, B2G (Gonk) and software-only (BasicLayers; possibly, there is ongoing discussion as to whether this is the best use of resources to improve the experience for 'low-end' users).
 ==Current status==
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 * Only scrolling is asynchronous/off main thread. All other features require further work.
 === Operating systems ===
-* Android: Beta quality. We continue to iron out OMTC bugs as the Android test base expands, but we are already quite high-quality.
+* Android: Released. We continue to iron out OMTC bugs as the Android test base expands, but we are already quite high-quality.
-* OS X: {{bug|756601}} Alpha quality. We began development of OMTC on this platform, but we haven't worked on it much since then.
+* OS X: {{bug|756601}} Alpha quality. We began development of OMTC on this platform, but we haven't worked on it much since then. It pretty much works but is disabled by default.
 * Linux: {{bug|722012}} In initial implementation stages. We're still sorting out basic issues with X and GL, as we don't support OMTC with BasicLayers yet.
 * B2G (Gonk): {{bug|741837}} Alpha quality. The B2G team has been working on getting it enabled and working through the implementation.
 * BasicLayers (software only): {{bug|703484}} In initial implementation stages. Marco Castelluccio, a volunteer contributor, is working through implementing off-main-thread BasicLayers, which also involves making our Cairo library thread-safe.
 * Windows:
-** Direct3D 10: {{bug|756606}} Not started yet.
+** Direct3D 10: {{bug|756606}} Not started yet; has some fundamental problems with textures which require the layers refactoring.
-** Direct3D 9: {{bug|756608}} Not started yet.
+** Direct3D 9: {{bug|756608}} Not started yet; but, in theory, should be fairly straightforward (there are already shadow layers implemented, but I don't think they are used anywhere).
 ==Future Work==
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 ===Off-main-thread layers implementations===
 Features listed above won't work off the main thread unless we have a layers implementation that knows how to draw off the main thread.
+==== Layers refactoring ====
+We are currently refactoring the layers system to more easily facilitate OMTC. The biggest changes are to the compositing side, and to how textures/buffers/handles are passed between the drawing and compositing components. The aim is for most OMTC code to be backend-independent. Compositing will be done by a Compositor class (rather than the ShadowLayerManager, which will still have responsibility for managing the shadow layer tree). There will be backend-specific compositor sub-classes, but the shadow layer tree and it's manager should be backend-independent. Buffers/textures will be handled by a TextureClient/TextureHost pair which will have backend-specific subclasses and will handle all inter-thread communication. The layer classes can then be agnostic about backend and IPC mechanism.
 ==== Android ====
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 =Development=
-Development is happening on mozilla-central.
+Development is happening on mozilla-central and the graphics branch (layers refactoring).
 =Test cases=
 http://people.mozilla.com/~ajuma/omtc/