Update GrSemaphore to allow it to only be used once for signaling and once for waiting.

This is required for Vulkan which doesn't allow a semaphore to be waited on by
multiple things at once or signaled from multiple places.

Bug: skia:
Change-Id: Iac0cb782a6662167c2cab1fd6a2c80378834a480
Reviewed-on: https://skia-review.googlesource.com/92601
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gpu/GrBackendTextureImageGenerator.cpp b/src/gpu/GrBackendTextureImageGenerator.cpp
index 186ca52446..420020b0b6 100644
--- a/src/gpu/GrBackendTextureImageGenerator.cpp
+++ b/src/gpu/GrBackendTextureImageGenerator.cpp
@@ -114,7 +114,8 @@ sk_sp<GrTextureProxy> GrBackendTextureImageGenerator::onGenerateTexture(
         } else {
             // Wait on a semaphore when a new context has just started borrowing the texture. This
             // is conservative, but shouldn't be too expensive.
-            if (fSemaphore && fLastBorrowingContextID != context->uniqueID()) {
+            if (fSemaphore && !fSemaphore->hasSubmittedWait() &&
+                fLastBorrowingContextID != context->uniqueID()) {
                 context->getGpu()->waitSemaphore(fSemaphore);
                 fLastBorrowingContextID = context->uniqueID();
             }