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Metal: Implement begin/end access synchronization with MTLSharedEvent 

Bug: b/252731382
Change-Id: Ie2bf978c10dcb7b2c03a2c7ff81ddd8b9b77ac20
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/106760
Reviewed-by: Shrek Shao <shrekshao@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>
This commit is contained in:
Austin Eng 2022-11-04 22:06:20 +00:00 committed by Dawn LUCI CQ
parent b6903295a8
commit 270c044100
9 changed files with 287 additions and 14 deletions
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30
include/dawn/native/MetalBackend.h
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@ -15,6 +15,8 @@
#ifndef INCLUDE_DAWN_NATIVE_METALBACKEND_H_
#define INCLUDE_DAWN_NATIVE_METALBACKEND_H_
#include <vector>
#include "dawn/dawn_wsi.h"
#include "dawn/native/DawnNative.h"
@ -38,19 +40,47 @@ struct DAWN_NATIVE_EXPORT AdapterDiscoveryOptions : public AdapterDiscoveryOptio
AdapterDiscoveryOptions();
};
struct DAWN_NATIVE_EXPORT ExternalImageMTLSharedEventDescriptor {
// Shared event handle `id<MTLSharedEvent>`.
// This never passes ownership to the callee (when used as an input
// parameter) or to the caller (when used as a return value or output parameter).
#ifdef __OBJC__
id<MTLSharedEvent> sharedEvent = nil;
static_assert(sizeof(id<MTLSharedEvent>) == sizeof(void*));
static_assert(alignof(id<MTLSharedEvent>) == alignof(void*));
#else
void* sharedEvent = nullptr;
#endif
// The value that was previously signaled on this event and should be waited on.
uint64_t signaledValue = 0;
};
struct DAWN_NATIVE_EXPORT ExternalImageDescriptorIOSurface : ExternalImageDescriptor {
public:
ExternalImageDescriptorIOSurface();
~ExternalImageDescriptorIOSurface();
IOSurfaceRef ioSurface;
// This has been deprecated.
uint32_t plane;
// A list of events to wait on before accessing the texture.
std::vector<ExternalImageMTLSharedEventDescriptor> waitEvents;
};
struct DAWN_NATIVE_EXPORT ExternalImageIOSurfaceEndAccessDescriptor
: ExternalImageMTLSharedEventDescriptor {
bool isInitialized;
};
DAWN_NATIVE_EXPORT WGPUTexture WrapIOSurface(WGPUDevice device,
const ExternalImageDescriptorIOSurface* descriptor);
DAWN_NATIVE_EXPORT void IOSurfaceEndAccess(WGPUTexture texture,
ExternalImageIOSurfaceEndAccessDescriptor* descriptor);
// When making Metal interop with other APIs, we need to be careful that QueueSubmit doesn't
// mean that the operations will be visible to other APIs/Metal devices right away. macOS
// does have a global queue of graphics operations, but the command buffers are inserted there

22
src/dawn/native/metal/CommandBufferMTL.mm
View File

@ -761,6 +761,10 @@ MaybeError CommandBuffer::FillCommands(CommandRecordingContext* commandContext)
case Command::BeginComputePass: {
BeginComputePassCmd* cmd = mCommands.NextCommand<BeginComputePassCmd>();
for (TextureBase* texture :
GetResourceUsages().computePasses[nextComputePassNumber].referencedTextures) {
ToBackend(texture)->SynchronizeTextureBeforeUse(commandContext);
}
for (const SyncScopeResourceUsage& scope :
GetResourceUsages().computePasses[nextComputePassNumber].dispatchUsages) {
LazyClearSyncScope(scope, commandContext);
@ -776,6 +780,20 @@ MaybeError CommandBuffer::FillCommands(CommandRecordingContext* commandContext)
case Command::BeginRenderPass: {
BeginRenderPassCmd* cmd = mCommands.NextCommand<BeginRenderPassCmd>();
for (TextureBase* texture :
this->GetResourceUsages().renderPasses[nextRenderPassNumber].textures) {
ToBackend(texture)->SynchronizeTextureBeforeUse(commandContext);
}
for (ExternalTextureBase* externalTexture : this->GetResourceUsages()
.renderPasses[nextRenderPassNumber]
.externalTextures) {
for (auto& view : externalTexture->GetTextureViews()) {
if (view.Get()) {
Texture* texture = ToBackend(view->GetTexture());
texture->SynchronizeTextureBeforeUse(commandContext);
}
}
}
LazyClearSyncScope(GetResourceUsages().renderPasses[nextRenderPassNumber],
commandContext);
commandContext->EndBlit();
@ -831,6 +849,7 @@ MaybeError CommandBuffer::FillCommands(CommandRecordingContext* commandContext)
buffer->EnsureDataInitialized(commandContext);
EnsureDestinationTextureInitialized(commandContext, texture, dst, copySize);
texture->SynchronizeTextureBeforeUse(commandContext);
RecordCopyBufferToTexture(commandContext, buffer->GetMTLBuffer(), buffer->GetSize(),
src.offset, src.bytesPerRow, src.rowsPerImage, texture,
dst.mipLevel, dst.origin, dst.aspect, copySize);
@ -852,6 +871,7 @@ MaybeError CommandBuffer::FillCommands(CommandRecordingContext* commandContext)
buffer->EnsureDataInitializedAsDestination(commandContext, copy);
texture->SynchronizeTextureBeforeUse(commandContext);
texture->EnsureSubresourceContentInitialized(
commandContext, GetSubresourcesAffectedByCopy(src, copySize));
@ -941,6 +961,8 @@ MaybeError CommandBuffer::FillCommands(CommandRecordingContext* commandContext)
Texture* srcTexture = ToBackend(copy->source.texture.Get());
Texture* dstTexture = ToBackend(copy->destination.texture.Get());
srcTexture->SynchronizeTextureBeforeUse(commandContext);
dstTexture->SynchronizeTextureBeforeUse(commandContext);
srcTexture->EnsureSubresourceContentInitialized(
commandContext, GetSubresourcesAffectedByCopy(copy->source, copy->copySize));
EnsureDestinationTextureInitialized(commandContext, dstTexture, copy->destination,

5
src/dawn/native/metal/CommandRecordingContext.h
View File

@ -22,6 +22,11 @@
namespace dawn::native::metal {
struct MTLSharedEventAndSignalValue {
NSPRef<id> sharedEvent;
uint64_t signaledValue;
};
// This class wraps a MTLCommandBuffer and tracks which Metal encoder is open.
// Only one encoder may be open at a time.
class CommandRecordingContext : NonMovable {

11
src/dawn/native/metal/DeviceMTL.h
View File

@ -18,6 +18,7 @@
#include <atomic>
#include <memory>
#include <mutex>
#include <vector>
#include "dawn/native/dawn_platform.h"
@ -33,6 +34,7 @@
namespace dawn::native::metal {
struct KalmanInfo;
struct ExternalImageMTLSharedEventDescriptor;
class Device final : public DeviceBase {
public:
@ -53,8 +55,12 @@ class Device final : public DeviceBase {
Device::SubmitMode submitMode = Device::SubmitMode::Normal);
MaybeError SubmitPendingCommandBuffer();
Ref<Texture> CreateTextureWrappingIOSurface(const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface);
void ExportLastSignaledEvent(ExternalImageMTLSharedEventDescriptor* desc);
Ref<Texture> CreateTextureWrappingIOSurface(
const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents);
void WaitForCommandsToBeScheduled();
ResultOrError<std::unique_ptr<StagingBufferBase>> CreateStagingBuffer(size_t size) override;
@ -134,6 +140,7 @@ class Device final : public DeviceBase {
ResultOrError<ExecutionSerial> CheckAndUpdateCompletedSerials() override;
NSPRef<id<MTLDevice>> mMtlDevice;
NSPRef<id> mMtlSharedEvent = nil; // MTLSharedEvent not available until macOS 10.14+.
NSPRef<id<MTLCommandQueue>> mCommandQueue;
CommandRecordingContext mCommandContext;

25
src/dawn/native/metal/DeviceMTL.mm
View File

@ -146,6 +146,10 @@ MaybeError Device::Initialize(const DeviceDescriptor* descriptor) {
return DAWN_INTERNAL_ERROR("Failed to allocate MTLCommandQueue.");
}
if (@available(macOS 10.14, *)) {
mMtlSharedEvent.Acquire([*mMtlDevice newSharedEvent]);
}
DAWN_TRY(mCommandContext.PrepareNextCommandBuffer(*mCommandQueue));
if (HasFeature(Feature::TimestampQuery) &&
@ -428,11 +432,21 @@ MaybeError Device::SubmitPendingCommandBuffer() {
TRACE_EVENT_ASYNC_BEGIN0(GetPlatform(), GPUWork, "DeviceMTL::SubmitPendingCommandBuffer",
uint64_t(pendingSerial));
if (@available(macOS 10.14, *)) {
id rawEvent = *mMtlSharedEvent;
id<MTLSharedEvent> sharedEvent = static_cast<id<MTLSharedEvent>>(rawEvent);
[*pendingCommands encodeSignalEvent:sharedEvent value:static_cast<uint64_t>(pendingSerial)];
}
[*pendingCommands commit];
return mCommandContext.PrepareNextCommandBuffer(*mCommandQueue);
}
void Device::ExportLastSignaledEvent(ExternalImageMTLSharedEventDescriptor* desc) {
desc->sharedEvent = *mMtlSharedEvent;
desc->signaledValue = static_cast<uint64_t>(GetLastSubmittedCommandSerial());
}
ResultOrError<std::unique_ptr<StagingBufferBase>> Device::CreateStagingBuffer(size_t size) {
std::unique_ptr<StagingBufferBase> stagingBuffer = std::make_unique<StagingBuffer>(size, this);
DAWN_TRY(stagingBuffer->Initialize());
@ -471,6 +485,7 @@ MaybeError Device::CopyFromStagingToTextureImpl(const StagingBufferBase* source,
TextureCopy* dst,
const Extent3D& copySizePixels) {
Texture* texture = ToBackend(dst->texture.Get());
texture->SynchronizeTextureBeforeUse(GetPendingCommandContext());
EnsureDestinationTextureInitialized(GetPendingCommandContext(DeviceBase::SubmitMode::Passive),
texture, *dst, copySizePixels);
@ -481,8 +496,10 @@ MaybeError Device::CopyFromStagingToTextureImpl(const StagingBufferBase* source,
return {};
}
Ref<Texture> Device::CreateTextureWrappingIOSurface(const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface) {
Ref<Texture> Device::CreateTextureWrappingIOSurface(
const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents) {
const TextureDescriptor* textureDescriptor = FromAPI(descriptor->cTextureDescriptor);
if (ConsumedError(ValidateIsAlive())) {
return nullptr;
@ -495,7 +512,9 @@ Ref<Texture> Device::CreateTextureWrappingIOSurface(const ExternalImageDescripto
}
Ref<Texture> result;
if (ConsumedError(Texture::CreateFromIOSurface(this, descriptor, ioSurface), &result)) {
if (ConsumedError(
Texture::CreateFromIOSurface(this, descriptor, ioSurface, std::move(waitEvents)),
&result)) {
return nullptr;
}
return result;

18
src/dawn/native/metal/MetalBackend.mm
View File

@ -17,6 +17,7 @@
#include "dawn/native/MetalBackend.h"
#include "dawn/native/metal/CommandRecordingContext.h"
#include "dawn/native/metal/DeviceMTL.h"
#include "dawn/native/metal/TextureMTL.h"
@ -28,13 +29,26 @@ AdapterDiscoveryOptions::AdapterDiscoveryOptions()
ExternalImageDescriptorIOSurface::ExternalImageDescriptorIOSurface()
: ExternalImageDescriptor(ExternalImageType::IOSurface) {}
ExternalImageDescriptorIOSurface::~ExternalImageDescriptorIOSurface() = default;
WGPUTexture WrapIOSurface(WGPUDevice device, const ExternalImageDescriptorIOSurface* cDescriptor) {
Device* backendDevice = ToBackend(FromAPI(device));
Ref<TextureBase> texture =
backendDevice->CreateTextureWrappingIOSurface(cDescriptor, cDescriptor->ioSurface);
std::vector<MTLSharedEventAndSignalValue> waitEvents;
for (const auto& waitEvent : cDescriptor->waitEvents) {
waitEvents.push_back(
{static_cast<id<MTLSharedEvent>>(waitEvent.sharedEvent), waitEvent.signaledValue});
}
Ref<TextureBase> texture = backendDevice->CreateTextureWrappingIOSurface(
cDescriptor, cDescriptor->ioSurface, std::move(waitEvents));
return ToAPI(texture.Detach());
}
void IOSurfaceEndAccess(WGPUTexture cTexture,
ExternalImageIOSurfaceEndAccessDescriptor* descriptor) {
Texture* texture = ToBackend(FromAPI(cTexture));
texture->IOSurfaceEndAccess(descriptor);
}
void WaitForCommandsToBeScheduled(WGPUDevice device) {
ToBackend(FromAPI(device))->WaitForCommandsToBeScheduled();
}

13
src/dawn/native/metal/TextureMTL.h
View File

@ -17,17 +17,20 @@
#include <IOSurface/IOSurfaceRef.h>
#import <Metal/Metal.h>
#include <vector>
#include "dawn/native/Texture.h"
#include "dawn/common/CoreFoundationRef.h"
#include "dawn/common/NSRef.h"
#include "dawn/native/DawnNative.h"
#include "dawn/native/MetalBackend.h"
namespace dawn::native::metal {
class CommandRecordingContext;
class Device;
struct MTLSharedEventAndSignalValue;
MTLPixelFormat MetalPixelFormat(wgpu::TextureFormat format);
MaybeError ValidateIOSurfaceCanBeWrapped(const DeviceBase* device,
@ -40,7 +43,8 @@ class Texture final : public TextureBase {
static ResultOrError<Ref<Texture>> CreateFromIOSurface(
Device* device,
const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface);
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents);
static Ref<Texture> CreateWrapping(Device* device,
const TextureDescriptor* descriptor,
NSPRef<id<MTLTexture>> wrapped);
@ -54,6 +58,9 @@ class Texture final : public TextureBase {
void EnsureSubresourceContentInitialized(CommandRecordingContext* commandContext,
const SubresourceRange& range);
void SynchronizeTextureBeforeUse(CommandRecordingContext* commandContext);
void IOSurfaceEndAccess(ExternalImageIOSurfaceEndAccessDescriptor* descriptor);
private:
using TextureBase::TextureBase;
~Texture() override;
@ -63,7 +70,8 @@ class Texture final : public TextureBase {
MaybeError InitializeAsInternalTexture(const TextureDescriptor* descriptor);
MaybeError InitializeFromIOSurface(const ExternalImageDescriptor* descriptor,
const TextureDescriptor* textureDescriptor,
IOSurfaceRef ioSurface);
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents);
void InitializeAsWrapping(const TextureDescriptor* descriptor, NSPRef<id<MTLTexture>> wrapped);
void DestroyImpl() override;
@ -76,6 +84,7 @@ class Texture final : public TextureBase {
MTLTextureUsage mMtlUsage;
CFRef<IOSurfaceRef> mIOSurface = nullptr;
std::vector<MTLSharedEventAndSignalValue> mWaitEvents;
};
class TextureView final : public TextureViewBase {

38
src/dawn/native/metal/TextureMTL.mm
View File

@ -691,14 +691,17 @@ ResultOrError<Ref<Texture>> Texture::Create(Device* device, const TextureDescrip
}
// static
ResultOrError<Ref<Texture>> Texture::CreateFromIOSurface(Device* device,
ResultOrError<Ref<Texture>> Texture::CreateFromIOSurface(
Device* device,
const ExternalImageDescriptor* descriptor,
IOSurfaceRef ioSurface) {
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents) {
const TextureDescriptor* textureDescriptor = FromAPI(descriptor->cTextureDescriptor);
Ref<Texture> texture =
AcquireRef(new Texture(device, textureDescriptor, TextureState::OwnedExternal));
DAWN_TRY(texture->InitializeFromIOSurface(descriptor, textureDescriptor, ioSurface));
DAWN_TRY(texture->InitializeFromIOSurface(descriptor, textureDescriptor, ioSurface,
std::move(waitEvents)));
return texture;
}
@ -739,8 +742,10 @@ void Texture::InitializeAsWrapping(const TextureDescriptor* descriptor,
MaybeError Texture::InitializeFromIOSurface(const ExternalImageDescriptor* descriptor,
const TextureDescriptor* textureDescriptor,
IOSurfaceRef ioSurface) {
IOSurfaceRef ioSurface,
std::vector<MTLSharedEventAndSignalValue> waitEvents) {
mIOSurface = ioSurface;
mWaitEvents = std::move(waitEvents);
// Uses WGPUTexture which wraps multiplanar ioSurface needs to create
// texture view explicitly. Wrap the ioSurface and delay to extract
@ -763,6 +768,31 @@ MaybeError Texture::InitializeFromIOSurface(const ExternalImageDescriptor* descr
return {};
}
void Texture::SynchronizeTextureBeforeUse(CommandRecordingContext* commandContext) {
if (@available(macOS 10.14, *)) {
if (!mWaitEvents.empty()) {
// There may be an open blit encoder from a copy command or writeBuffer.
// Wait events are only allowed if there is no encoder open.
commandContext->EndBlit();
}
auto commandBuffer = commandContext->GetCommands();
// Consume the wait events on the texture. They will be empty after this loop.
for (auto waitEvent : std::move(mWaitEvents)) {
id rawEvent = *waitEvent.sharedEvent;
id<MTLSharedEvent> sharedEvent = static_cast<id<MTLSharedEvent>>(rawEvent);
[commandBuffer encodeWaitForEvent:sharedEvent value:waitEvent.signaledValue];
}
}
}
void Texture::IOSurfaceEndAccess(ExternalImageIOSurfaceEndAccessDescriptor* descriptor) {
ASSERT(descriptor);
ToBackend(GetDevice())->ExportLastSignaledEvent(descriptor);
descriptor->isInitialized = IsSubresourceContentInitialized(GetAllSubresources());
// Destroy the texture as it should not longer be used after EndAccess.
Destroy();
}
Texture::Texture(DeviceBase* dev, const TextureDescriptor* desc, TextureState st)
: TextureBase(dev, desc, st) {}

137
src/dawn/tests/end2end/IOSurfaceWrappingTests.cpp
View File

@ -449,6 +449,143 @@ TEST_P(IOSurfaceUsageTests, UninitializedTextureIsCleared) {
// wrap ioSurface and ensure color is not visible when isInitialized set to false
wgpu::Texture ioSurfaceTexture = WrapIOSurface(&textureDescriptor, ioSurface.get(), false);
EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8(0, 0, 0, 0), ioSurfaceTexture, 0, 0);
dawn::native::metal::ExternalImageIOSurfaceEndAccessDescriptor endAccessDesc;
dawn::native::metal::IOSurfaceEndAccess(ioSurfaceTexture.Get(), &endAccessDesc);
EXPECT_TRUE(endAccessDesc.isInitialized);
}
// Test that exporting a texture wrapping an IOSurface sets the isInitialized bit to
// false if the contents are discard.
TEST_P(IOSurfaceUsageTests, UninitializedOnEndAccess) {
DAWN_TEST_UNSUPPORTED_IF(UsesWire());
ScopedIOSurfaceRef ioSurface = CreateSinglePlaneIOSurface(1, 1, kCVPixelFormatType_32RGBA, 4);
uint32_t data = 0x04030201;
IOSurfaceLock(ioSurface.get(), 0, nullptr);
memcpy(IOSurfaceGetBaseAddress(ioSurface.get()), &data, sizeof(data));
IOSurfaceUnlock(ioSurface.get(), 0, nullptr);
wgpu::TextureDescriptor textureDescriptor;
textureDescriptor.dimension = wgpu::TextureDimension::e2D;
textureDescriptor.format = wgpu::TextureFormat::RGBA8Unorm;
textureDescriptor.size = {1, 1, 1};
textureDescriptor.sampleCount = 1;
textureDescriptor.mipLevelCount = 1;
textureDescriptor.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;
// Wrap ioSurface
wgpu::Texture ioSurfaceTexture = WrapIOSurface(&textureDescriptor, ioSurface.get(), true);
// Uninitialize the teuxture with a render pass.
utils::ComboRenderPassDescriptor renderPassDescriptor({ioSurfaceTexture.CreateView()});
renderPassDescriptor.cColorAttachments[0].storeOp = wgpu::StoreOp::Discard;
wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
encoder.BeginRenderPass(&renderPassDescriptor).End();
wgpu::CommandBuffer commandBuffer = encoder.Finish();
queue.Submit(1, &commandBuffer);
dawn::native::metal::ExternalImageIOSurfaceEndAccessDescriptor endAccessDesc;
dawn::native::metal::IOSurfaceEndAccess(ioSurfaceTexture.Get(), &endAccessDesc);
EXPECT_FALSE(endAccessDesc.isInitialized);
}
// Test that an IOSurface may be imported across multiple devices.
TEST_P(IOSurfaceUsageTests, WriteThenConcurrentReadThenWrite) {
DAWN_TEST_UNSUPPORTED_IF(UsesWire());
ScopedIOSurfaceRef ioSurface = CreateSinglePlaneIOSurface(1, 1, kCVPixelFormatType_32RGBA, 4);
uint32_t data = 0x04030201;
IOSurfaceLock(ioSurface.get(), 0, nullptr);
memcpy(IOSurfaceGetBaseAddress(ioSurface.get()), &data, sizeof(data));
IOSurfaceUnlock(ioSurface.get(), 0, nullptr);
// Make additional devices. We will import with the writeDevice, then read it concurrently with
// both readDevices.
wgpu::Device writeDevice = device;
wgpu::Device readDevice1 = CreateDevice();
wgpu::Device readDevice2 = CreateDevice();
wgpu::TextureDescriptor textureDesc;
textureDesc.dimension = wgpu::TextureDimension::e2D;
textureDesc.format = wgpu::TextureFormat::RGBA8Unorm;
textureDesc.size = {1, 1, 1};
textureDesc.sampleCount = 1;
textureDesc.mipLevelCount = 1;
textureDesc.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;
// Wrap ioSurface
dawn::native::metal::ExternalImageDescriptorIOSurface writeExternDesc;
writeExternDesc.cTextureDescriptor =
reinterpret_cast<const WGPUTextureDescriptor*>(&textureDesc);
writeExternDesc.ioSurface = ioSurface.get();
writeExternDesc.isInitialized = true;
wgpu::Texture writeTexture = wgpu::Texture::Acquire(
dawn::native::metal::WrapIOSurface(writeDevice.Get(), &writeExternDesc));
// Clear the texture to green.
{
utils::ComboRenderPassDescriptor renderPassDescriptor({writeTexture.CreateView()});
renderPassDescriptor.cColorAttachments[0].clearValue = {0.0, 1.0, 0.0, 1.0};
wgpu::CommandEncoder encoder = writeDevice.CreateCommandEncoder();
encoder.BeginRenderPass(&renderPassDescriptor).End();
wgpu::CommandBuffer commandBuffer = encoder.Finish();
writeDevice.GetQueue().Submit(1, &commandBuffer);
}
// End access.
dawn::native::metal::ExternalImageIOSurfaceEndAccessDescriptor endWriteAccessDesc;
dawn::native::metal::IOSurfaceEndAccess(writeTexture.Get(), &endWriteAccessDesc);
EXPECT_TRUE(endWriteAccessDesc.isInitialized);
dawn::native::metal::ExternalImageDescriptorIOSurface externDesc;
externDesc.cTextureDescriptor = reinterpret_cast<const WGPUTextureDescriptor*>(&textureDesc);
externDesc.ioSurface = ioSurface.get();
externDesc.isInitialized = true;
externDesc.waitEvents.push_back(
{endWriteAccessDesc.sharedEvent, endWriteAccessDesc.signaledValue});
// Wrap on two separate devices to read it.
wgpu::Texture readTexture1 =
wgpu::Texture::Acquire(dawn::native::metal::WrapIOSurface(readDevice1.Get(), &externDesc));
wgpu::Texture readTexture2 =
wgpu::Texture::Acquire(dawn::native::metal::WrapIOSurface(readDevice2.Get(), &externDesc));
// Expect the texture to be green
EXPECT_TEXTURE_EQ(readDevice1, utils::RGBA8(0, 255, 0, 255), readTexture1, {0, 0});
EXPECT_TEXTURE_EQ(readDevice2, utils::RGBA8(0, 255, 0, 255), readTexture2, {0, 0});
// End access on both read textures.
dawn::native::metal::ExternalImageIOSurfaceEndAccessDescriptor endReadAccessDesc1;
dawn::native::metal::IOSurfaceEndAccess(readTexture1.Get(), &endReadAccessDesc1);
EXPECT_TRUE(endReadAccessDesc1.isInitialized);
dawn::native::metal::ExternalImageIOSurfaceEndAccessDescriptor endReadAccessDesc2;
dawn::native::metal::IOSurfaceEndAccess(readTexture2.Get(), &endReadAccessDesc2);
EXPECT_TRUE(endReadAccessDesc2.isInitialized);
// Import again for writing. It should not race with the previous reads.
writeExternDesc.waitEvents = {endReadAccessDesc1, endReadAccessDesc2};
writeExternDesc.isInitialized = true;
writeTexture = wgpu::Texture::Acquire(
dawn::native::metal::WrapIOSurface(writeDevice.Get(), &writeExternDesc));
// Clear the texture to blue.
{
utils::ComboRenderPassDescriptor renderPassDescriptor({writeTexture.CreateView()});
renderPassDescriptor.cColorAttachments[0].clearValue = {0.0, 0.0, 1.0, 1.0};
wgpu::CommandEncoder encoder = writeDevice.CreateCommandEncoder();
encoder.BeginRenderPass(&renderPassDescriptor).End();
wgpu::CommandBuffer commandBuffer = encoder.Finish();
writeDevice.GetQueue().Submit(1, &commandBuffer);
}
// Finally, expect the contents to be blue now.
EXPECT_TEXTURE_EQ(writeDevice, utils::RGBA8(0, 0, 255, 255), writeTexture, {0, 0});
dawn::native::metal::IOSurfaceEndAccess(writeTexture.Get(), &endWriteAccessDesc);
EXPECT_TRUE(endWriteAccessDesc.isInitialized);
}
DAWN_INSTANTIATE_TEST(IOSurfaceValidationTests, MetalBackend());