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Add a per-thread proc table using thread local storage

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In situations where both dawn_wire and dawn_native are used on separate
threads (Chrome with --single-process or --in-process-gpu), it's
desirable to have a per-thread proc table so that the WebGPU C++ API can
still be used. This eliminates classes of bugs with manual
reference/release errors.

This also changes many of the GetProcs functions to return const
references to the static proc tables known at compile time, instead of a
copy.

Bug: none
Change-Id: I8775bb715b312dd9476a1903fbd797d4b1302614
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/29240
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This commit is contained in:
Austin Eng
2020-10-05 19:53:58 +00:00
committed by Commit Bot service account
parent df90930683
commit b04a92f01b
20 changed files with 248 additions and 41 deletions
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33
src/include/dawn/dawn_thread_dispatch_proc.h Normal file
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@@ -0,0 +1,33 @@
// Copyright 2020 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWN_DAWN_THREAD_DISPATCH_PROC_H_
#define DAWN_DAWN_THREAD_DISPATCH_PROC_H_
#include "dawn/dawn_proc.h"
#ifdef __cplusplus
extern "C" {
#endif
// Call dawnProcSetProcs(&dawnThreadDispatchProcTable) and then use dawnProcSetPerThreadProcs
// to set per-thread procs.
WGPU_EXPORT extern DawnProcTable dawnThreadDispatchProcTable;
WGPU_EXPORT void dawnProcSetPerThreadProcs(const DawnProcTable* procs);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // DAWN_DAWN_THREAD_DISPATCH_PROC_H_

2
src/include/dawn_native/DawnNative.h
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@@ -170,7 +170,7 @@ namespace dawn_native {
};
// Backend-agnostic API for dawn_native
DAWN_NATIVE_EXPORT DawnProcTable GetProcs();
DAWN_NATIVE_EXPORT const DawnProcTable& GetProcs();
// Query the names of all the toggles that are enabled in device
DAWN_NATIVE_EXPORT std::vector<const char*> GetTogglesUsed(WGPUDevice device);

5
src/include/dawn_wire/WireClient.h
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@@ -26,6 +26,8 @@ namespace dawn_wire {
namespace client {
class Client;
class MemoryTransferService;
DAWN_WIRE_EXPORT const DawnProcTable& GetProcs();
} // namespace client
struct ReservedTexture {
@@ -44,7 +46,8 @@ namespace dawn_wire {
WireClient(const WireClientDescriptor& descriptor);
~WireClient() override;
static DawnProcTable GetProcs();
// TODO(enga): Remove this and use dawn_wire::client::GetProcs() instead
static const DawnProcTable& GetProcs();
WGPUDevice GetDevice() const;
const volatile char* HandleCommands(const volatile char* commands,