src/dawn/wire/client/LimitsAndFeatures.cpp

// Copyright 2021 The Dawn & Tint Authors
//
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//    this list of conditions and the following disclaimer in the documentation
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#include "dawn/wire/client/LimitsAndFeatures.h"

#include "dawn/common/Assert.h"
#include "dawn/wire/SupportedFeatures.h"

namespace dawn::wire::client {

LimitsAndFeatures::LimitsAndFeatures() = default;

LimitsAndFeatures::~LimitsAndFeatures() = default;

WGPUStatus LimitsAndFeatures::GetLimits(WGPULimits* limits) const {
    DAWN_ASSERT(limits != nullptr);
    auto* originalNextInChain = limits->nextInChain;
    *limits = mLimits;
    limits->nextInChain = originalNextInChain;
    // Handle other requiring limits that chained after WGPUSupportedLimits
    for (auto* chain = limits->nextInChain; chain; chain = chain->next) {
        // Store the WGPUChainedStruct to restore the chain after assignment.
        WGPUChainedStruct originalChainedStruct = *chain;
        switch (chain->sType) {
            case WGPUSType_CompatibilityModeLimits: {
                *reinterpret_cast<WGPUCompatibilityModeLimits*>(chain) = mCompatLimits;
                break;
            }
            case WGPUSType_DawnTexelCopyBufferRowAlignmentLimits: {
                *reinterpret_cast<WGPUDawnTexelCopyBufferRowAlignmentLimits*>(chain) =
                    mTexelCopyBufferRowAlignmentLimits;
                break;
            }
            default:
                // Fail if unknown sType found.
                return WGPUStatus_Error;
        }
        // Restore the chain (sType and next).
        *chain = originalChainedStruct;
    }
    return WGPUStatus_Success;
}

bool LimitsAndFeatures::HasFeature(WGPUFeatureName feature) const {
    return mFeatures.contains(feature);
}

void LimitsAndFeatures::ToSupportedFeatures(WGPUSupportedFeatures* supportedFeatures) const {
    if (!supportedFeatures) {
        return;
    }

    const size_t count = mFeatures.size();
    supportedFeatures->featureCount = count;
    supportedFeatures->features = nullptr;

    if (count == 0) {
        return;
    }

    // This will be freed by wgpuSupportedFeaturesFreeMembers.
    WGPUFeatureName* features = new WGPUFeatureName[count];
    uint32_t index = 0;
    for (WGPUFeatureName f : mFeatures) {
        features[index++] = f;
    }
    DAWN_ASSERT(index == count);
    supportedFeatures->features = features;
}

void LimitsAndFeatures::SetLimits(const WGPULimits* limits) {
    DAWN_ASSERT(limits != nullptr);
    mLimits = *limits;
    mLimits.nextInChain = nullptr;
    // Handle other limits that chained after WGPUSupportedLimits
    for (auto* chain = limits->nextInChain; chain; chain = chain->next) {
        switch (chain->sType) {
            case WGPUSType_CompatibilityModeLimits: {
                mCompatLimits = *reinterpret_cast<WGPUCompatibilityModeLimits*>(chain);
                DAWN_ASSERT(mCompatLimits.chain.sType == WGPUSType_CompatibilityModeLimits);
                mCompatLimits.chain.next = nullptr;
                break;
            }
            case WGPUSType_DawnTexelCopyBufferRowAlignmentLimits: {
                mTexelCopyBufferRowAlignmentLimits =
                    *reinterpret_cast<WGPUDawnTexelCopyBufferRowAlignmentLimits*>(chain);
                DAWN_ASSERT(mTexelCopyBufferRowAlignmentLimits.chain.sType ==
                            WGPUSType_DawnTexelCopyBufferRowAlignmentLimits);
                mTexelCopyBufferRowAlignmentLimits.chain.next = nullptr;
                break;
            }
            default:
                DAWN_UNREACHABLE();
        }
    }
}

void LimitsAndFeatures::SetFeatures(const WGPUFeatureName* features, uint32_t featuresCount) {
    DAWN_ASSERT(features != nullptr || featuresCount == 0);
    for (uint32_t i = 0; i < featuresCount; ++i) {
        // Filter out features that the server supports, but the client does not.
        // (Could be different versions)
        if (!IsFeatureSupported(features[i])) {
            continue;
        }
        mFeatures.insert(features[i]);
    }
}

}  // namespace dawn::wire::client