kc3-lang/angle

2023-08-17T15:29:24

Make shader recompile while parallel linking safe Prior to this change, Program* objects held references to Shader* objects. This poses a problem where a shader recompile can race with a program link, if the program link is done in parallel. As a result, a good chunk of the link job is done serially and under the share group lock. After this change, that is no longer a problem, and most of the link can be made lockless/parallelized. This change separates out the "compiled state" from the rest of the shader state. This was already done for the front-end state (for the sake of caching), but is also now done for the backends that need it. The compiled state in turn is placed in a shared_ptr, and is shared with the program. When a shader is compiled, its own shared_ptr is replaced with a new object, leaving all programs currently compiling unaffected and using the previous compilation results. Once a program is linked, its references to compiled shader states is updated. Bug: angleproject:8297 Change-Id: Iff7094a37088fbad99c6241f1c48b0bd4c820eb2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4791065 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Charlie Lao <cclao@google.com>