Source/WebKit/Shared/WebGPU/WebGPURenderPassDescriptor.cpp

/*
 * Copyright (C) 2021 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "WebGPURenderPassDescriptor.h"

#if ENABLE(GPU_PROCESS)

#include "WebGPUConvertFromBackingContext.h"
#include "WebGPUConvertToBackingContext.h"
#include <pal/graphics/WebGPU/WebGPURenderPassDescriptor.h>

namespace WebKit::WebGPU {

std::optional<RenderPassDescriptor> ConvertToBackingContext::convertToBacking(const PAL::WebGPU::RenderPassDescriptor& renderPassDescriptor)
{
    auto base = convertToBacking(static_cast<const PAL::WebGPU::ObjectDescriptorBase&>(renderPassDescriptor));
    if (!base)
        return std::nullopt;

    Vector<RenderPassColorAttachment> colorAttachments;
    colorAttachments.reserveInitialCapacity(renderPassDescriptor.colorAttachments.size());
    for (const auto& colorAttachment : renderPassDescriptor.colorAttachments) {
        auto backingColorAttachment = convertToBacking(colorAttachment);
        if (!backingColorAttachment)
            return std::nullopt;
        colorAttachments.uncheckedAppend(WTFMove(*backingColorAttachment));
    }

    std::optional<RenderPassDepthStencilAttachment> depthStencilAttachment;
    if (renderPassDescriptor.depthStencilAttachment) {
        depthStencilAttachment = convertToBacking(*renderPassDescriptor.depthStencilAttachment);
        if (!depthStencilAttachment)
            return std::nullopt;
    }

    WebGPUIdentifier occlusionQuerySet;
    if (renderPassDescriptor.occlusionQuerySet) {
        occlusionQuerySet = convertToBacking(*renderPassDescriptor.occlusionQuerySet);
        if (!occlusionQuerySet)
            return std::nullopt;
    }

    auto timestampWrites = convertToBacking(renderPassDescriptor.timestampWrites);
    if (!timestampWrites)
        return std::nullopt;

    return { { WTFMove(*base), WTFMove(colorAttachments), WTFMove(depthStencilAttachment), occlusionQuerySet, WTFMove(*timestampWrites) } };
}

std::optional<PAL::WebGPU::RenderPassDescriptor> ConvertFromBackingContext::convertFromBacking(const RenderPassDescriptor& renderPassDescriptor)
{
    auto base = convertFromBacking(static_cast<const ObjectDescriptorBase&>(renderPassDescriptor));
    if (!base)
        return std::nullopt;

    Vector<PAL::WebGPU::RenderPassColorAttachment> colorAttachments;
    colorAttachments.reserveInitialCapacity(renderPassDescriptor.colorAttachments.size());
    for (const auto& backingColorAttachment : renderPassDescriptor.colorAttachments) {
        auto colorAttachment = convertFromBacking(backingColorAttachment);
        if (!colorAttachment)
            return std::nullopt;
        colorAttachments.uncheckedAppend(WTFMove(*colorAttachment));
    }

    auto depthStencilAttachment = ([&] () -> std::optional<PAL::WebGPU::RenderPassDepthStencilAttachment> {
        if (renderPassDescriptor.depthStencilAttachment)
            return convertFromBacking(*renderPassDescriptor.depthStencilAttachment);
        return std::nullopt;
    })();
    if (renderPassDescriptor.depthStencilAttachment && !depthStencilAttachment)
        return std::nullopt;

    PAL::WebGPU::QuerySet* occlusionQuerySet = nullptr;
    if (renderPassDescriptor.occlusionQuerySet) {
        occlusionQuerySet = convertQuerySetFromBacking(renderPassDescriptor.occlusionQuerySet);
        if (!occlusionQuerySet)
            return std::nullopt;
    }

    auto timestampWrites = convertFromBacking(renderPassDescriptor.timestampWrites);
    if (!timestampWrites)
        return std::nullopt;

    return { { WTFMove(*base), WTFMove(colorAttachments), WTFMove(depthStencilAttachment), occlusionQuerySet, WTFMove(*timestampWrites) } };
}

} // namespace WebKit

#endif // ENABLE(GPU_PROCESS)