mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-24 05:11:16 +00:00
1d9820a99d
Currently CopyToSwapChain creates spurious copies of the back buffer when SharedSurfaces aren't exportable (= ToSurfaceDescriptor returns Nothing from SharedSurface_Basic). These then later get read back into a CPU memory buffer when PresentFrontBufferToCompositor is used to send the buffer to RemoteTextureMap. This has associated performance and memory costs. Conceptually, we want Present/CopyToSwapChain to just do the right thing and automatically push buffers to RemoteTextureMap, rather than secondarily needing a hidden call to PresentFrontBufferToCompositor. Then we can get rid of the need to create front buffers whose only purpose is to shuttle data to PresentFrontBufferToCompositor which then shuttles it RemoteTextureMap. This patch achieves this by refactoring the guts of PresentFrontBufferToCompositor into Present/CopyToSwapChain. The remote texture ids are sent along inside SwapChainOptions if async present is enabled. Those remote texture ids are cached in ClientWebGLContext so that GetFrontBuffer can return them without any subsequent need for an IPDL call. On the parent side, CopyToSwapChain will now notice if async present is to be used and if a SurfaceFactory does not generate SharedSurfaces that can be exported. In that case it cuts out the middle man and reads from the WebGLFramebuffer's back buffer directly into a CPU buffer to send to RemoteTextureMap. This also adds a forceAsyncPresent option to SwapChainOptions so that in the future we can have a separate pref for Accelerated Canvas2D that will allow enabling async present independent of the global WebGL pref. Differential Revision: https://phabricator.services.mozilla.com/D150720 |
||
|---|---|---|
| .. | ||
| 2d | ||
| angle | ||
| cairo | ||
| config | ||
| docs | ||
| gl | ||
| graphite2 | ||
| harfbuzz | ||
| ipc | ||
| layers | ||
| ots | ||
| qcms | ||
| skia | ||
| src | ||
| tests | ||
| thebes | ||
| vr | ||
| webrender_bindings | ||
| wgpu_bindings | ||
| wr | ||
| ycbcr | ||
| metrics.yaml | ||
| moz.build | ||