src/dawn/wire/server/ServerInstance.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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//    this list of conditions and the following disclaimer in the documentation
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#include <algorithm>
#include <vector>

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

namespace dawn::wire::server {

WireResult Server::DoInstanceRequestAdapter(Known<WGPUInstance> instance,
                                            ObjectHandle eventManager,
                                            WGPUFuture future,
                                            ObjectHandle adapterHandle,
                                            const WGPURequestAdapterOptions* options) {
    Known<WGPUAdapter> adapter;
    WIRE_TRY(AdapterObjects().Allocate(&adapter, adapterHandle, AllocationState::Reserved));

    auto userdata = MakeUserdata<RequestAdapterUserdata>();
    userdata->eventManager = eventManager;
    userdata->future = future;
    userdata->adapterObjectId = adapter.id;

    mProcs.instanceRequestAdapter(instance->handle, options,
                                  ForwardToServer<&Server::OnRequestAdapterCallback>,
                                  userdata.release());
    return WireResult::Success;
}

void Server::OnRequestAdapterCallback(RequestAdapterUserdata* data,
                                      WGPURequestAdapterStatus status,
                                      WGPUAdapter adapter,
                                      const char* message) {
    ReturnInstanceRequestAdapterCallbackCmd cmd = {};
    cmd.eventManager = data->eventManager;
    cmd.future = data->future;
    cmd.status = status;
    cmd.message = message;

    if (status != WGPURequestAdapterStatus_Success) {
        // Free the ObjectId which will make it unusable.
        AdapterObjects().Free(data->adapterObjectId);
        DAWN_ASSERT(adapter == nullptr);
        SerializeCommand(cmd);
        return;
    }

    // Assign the handle and allocated status if the adapter is created successfully.
    AdapterObjects().FillReservation(data->adapterObjectId, adapter);

    // Query and report the adapter supported features.
    std::vector<WGPUFeatureName> features;

    size_t featuresCount = mProcs.adapterEnumerateFeatures(adapter, nullptr);
    features.resize(featuresCount);
    mProcs.adapterEnumerateFeatures(adapter, features.data());

    // Hide features the wire cannot support.
    auto it = std::partition(features.begin(), features.end(), IsFeatureSupported);

    cmd.featuresCount = std::distance(features.begin(), it);
    cmd.features = features.data();

    // Query and report the adapter properties.
    WGPUAdapterProperties properties = {};
    WGPUChainedStructOut** propertiesChain = &properties.nextInChain;

    // Query AdapterPropertiesMemoryHeaps if the feature is supported.
    WGPUAdapterPropertiesMemoryHeaps memoryHeapProperties = {};
    memoryHeapProperties.chain.sType = WGPUSType_AdapterPropertiesMemoryHeaps;
    if (mProcs.adapterHasFeature(adapter, WGPUFeatureName_AdapterPropertiesMemoryHeaps)) {
        *propertiesChain = &memoryHeapProperties.chain;
        propertiesChain = &(*propertiesChain)->next;
    }

    // Query AdapterPropertiesD3D if the feature is supported.
    WGPUAdapterPropertiesD3D d3dProperties = {};
    d3dProperties.chain.sType = WGPUSType_AdapterPropertiesD3D;
    if (mProcs.adapterHasFeature(adapter, WGPUFeatureName_AdapterPropertiesD3D)) {
        *propertiesChain = &d3dProperties.chain;
        propertiesChain = &(*propertiesChain)->next;
    }

    // Query AdapterPropertiesVk if the feature is supported.
    WGPUAdapterPropertiesVk vkProperties = {};
    vkProperties.chain.sType = WGPUSType_AdapterPropertiesVk;
    if (mProcs.adapterHasFeature(adapter, WGPUFeatureName_AdapterPropertiesVk)) {
        *propertiesChain = &vkProperties.chain;
        propertiesChain = &(*propertiesChain)->next;
    }

    mProcs.adapterGetProperties(adapter, &properties);
    cmd.properties = &properties;

    // Query and report the adapter limits, including DawnExperimentalSubgroupLimits.
    WGPUSupportedLimits limits = {};

    WGPUDawnExperimentalSubgroupLimits experimentalSubgroupLimits = {};
    experimentalSubgroupLimits.chain.sType = WGPUSType_DawnExperimentalSubgroupLimits;
    limits.nextInChain = &experimentalSubgroupLimits.chain;

    mProcs.adapterGetLimits(adapter, &limits);
    cmd.limits = &limits;

    SerializeCommand(cmd);
    mProcs.adapterPropertiesFreeMembers(properties);
    mProcs.adapterPropertiesMemoryHeapsFreeMembers(memoryHeapProperties);
}

}  // namespace dawn::wire::server