src/dawn/wire/server/ServerAdapter.cpp

// Copyright 2021 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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//    this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include <vector>

#include "dawn/wire/SupportedFeatures.h"
#include "dawn/wire/WireResult.h"
#include "dawn/wire/server/ObjectStorage.h"
#include "dawn/wire/server/Server.h"

namespace dawn::wire::server {

WireResult Server::DoAdapterRequestDevice(Known<WGPUAdapter> adapter,
                                          ObjectHandle eventManager,
                                          WGPUFuture future,
                                          ObjectHandle deviceHandle,
                                          WGPUFuture deviceLostFuture,
                                          const WGPUDeviceDescriptor* descriptor) {
    Reserved<WGPUDevice> device;
    WIRE_TRY(Objects<WGPUDevice>().Allocate(&device, deviceHandle, AllocationState::Reserved));

    auto userdata = MakeUserdata<RequestDeviceUserdata>();
    userdata->eventManager = eventManager;
    userdata->future = future;
    userdata->deviceObjectId = device.id;
    userdata->deviceLostFuture = deviceLostFuture;

    // Update the descriptor with the device lost callback associated with this request.
    auto deviceLostUserdata = MakeUserdata<DeviceLostUserdata>();
    deviceLostUserdata->eventManager = eventManager;
    deviceLostUserdata->future = deviceLostFuture;

    WGPUDeviceDescriptor desc = *descriptor;
    desc.deviceLostCallbackInfo.mode = WGPUCallbackMode_AllowProcessEvents;
    desc.deviceLostCallbackInfo.callback = ForwardToServer<&Server::OnDeviceLost>;
    desc.deviceLostCallbackInfo.userdata = deviceLostUserdata.release();

    mProcs.adapterRequestDevice(adapter->handle, &desc,
                                ForwardToServer<&Server::OnRequestDeviceCallback>,
                                userdata.release());
    return WireResult::Success;
}

void Server::OnRequestDeviceCallback(RequestDeviceUserdata* data,
                                     WGPURequestDeviceStatus status,
                                     WGPUDevice device,
                                     const char* message) {
    ReturnAdapterRequestDeviceCallbackCmd cmd = {};
    cmd.eventManager = data->eventManager;
    cmd.future = data->future;
    cmd.status = status;
    cmd.message = message;

    if (status != WGPURequestDeviceStatus_Success) {
        DAWN_ASSERT(device == nullptr);
        SerializeCommand(cmd);
        return;
    }

    std::vector<WGPUFeatureName> features;

    size_t featuresCount = mProcs.deviceEnumerateFeatures(device, nullptr);
    features.resize(featuresCount);
    mProcs.deviceEnumerateFeatures(device, features.data());

    // The client should only be able to request supported features, so all enumerated
    // features that were enabled must also be supported by the wire.
    // Note: We fail the callback here, instead of immediately upon receiving
    // the request to preserve callback ordering.
    for (WGPUFeatureName f : features) {
        if (!IsFeatureSupported(f)) {
            // Release the device.
            mProcs.deviceRelease(device);
            device = nullptr;

            cmd.status = WGPURequestDeviceStatus_Error;
            cmd.message = "Requested feature not supported.";
            SerializeCommand(cmd);
            return;
        }
    }

    cmd.featuresCount = features.size();
    cmd.features = features.data();

    WGPUSupportedLimits limits = {};
    // Also query the DawnExperimentalSubgroupLimits and report to client.
    WGPUDawnExperimentalSubgroupLimits experimentalSubgroupLimits = {};
    experimentalSubgroupLimits.chain.sType = WGPUSType_DawnExperimentalSubgroupLimits;
    limits.nextInChain = &experimentalSubgroupLimits.chain;
    mProcs.deviceGetLimits(device, &limits);
    cmd.limits = &limits;

    // Assign the handle and allocated status if the device is created successfully.
    Known<WGPUDevice> reservation;
    if (FillReservation(data->deviceObjectId, device, &reservation) == WireResult::FatalError) {
        cmd.status = WGPURequestDeviceStatus_Unknown;
        cmd.message = "Destroyed before request was fulfilled.";
        SerializeCommand(cmd);
    }
    DAWN_ASSERT(reservation.data != nullptr);
    reservation->info->server = this;
    reservation->info->self = reservation.AsHandle();
    SetForwardingDeviceCallbacks(reservation);
    SerializeCommand(cmd);
}

}  // namespace dawn::wire::server