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Fix #106704: Resolve flashing Metal viewport #106914

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Jeroen Bakker merged 2 commits from Jason-Fielder/blender:Fix_106704 into main 2023-04-14 07:54:19 +02:00
Conversation 0 Commits 2 Files Changed 2 +13 -10
2 changed files with 13 additions and 10 deletions
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10
source/blender/gpu/metal/mtl_context.mm
View File

@ -2191,16 +2191,6 @@ void present(MTLRenderPassDescriptor *blit_descriptor,
id<MTLCommandBuffer> cmdbuf = [ctx->queue commandBuffer];
MTLCommandBufferManager::num_active_cmd_bufs++;
if (MTLCommandBufferManager::sync_event != nil) {
/* Release synchronization primitive for current frame to avoid cross-frame dependencies.
* We require MTLEvents to ensure correct ordering of workload submissions within a frame,
* however, we should not create long chains of dependencies spanning several drawables as any
* temporary stalls can then trigger erroneous GPU timeouts in non-dependent submissions. */
[MTLCommandBufferManager::sync_event release];
MTLCommandBufferManager::sync_event = nil;
MTLCommandBufferManager::event_signal_val = 0;
}
/* Do Present Call and final Blit to MTLDrawable. */
id<MTLRenderCommandEncoder> enc = [cmdbuf renderCommandEncoderWithDescriptor:blit_descriptor];
[enc setRenderPipelineState:blit_pso];

13
source/blender/gpu/metal/mtl_state.mm
View File

@ -607,6 +607,19 @@ void MTLFence::wait()
return;
}
/* Note(#106431 #106704): `sync_event` is a global cross-context synchronization primitive used
* to ensure GPU workloads execute in the correct order across contexts.
*
* To prevent unexpected GPU stalls, this needs to be reset when used along side explicit
* synchronization. Previously this was handled during frame boundaries, however, to eliminate
* situational flickering (#106704), only reset this during the cases where we are waiting on
* synchronization primitives. */
if (MTLCommandBufferManager::sync_event != nil) {
[MTLCommandBufferManager::sync_event release];
MTLCommandBufferManager::sync_event = nil;
MTLCommandBufferManager::event_signal_val = 0;
}
if (signalled_) {
MTLContext *ctx = MTLContext::get();
BLI_assert(ctx);