Source/WebKit/Shared/WebGPU/WebGPURenderPassColorAttachment.cpp

/*
 * Copyright (C) 2021 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "WebGPURenderPassColorAttachment.h"

#if ENABLE(GPU_PROCESS)

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

namespace WebKit::WebGPU {

std::optional<RenderPassColorAttachment> ConvertToBackingContext::convertToBacking(const PAL::WebGPU::RenderPassColorAttachment& renderPassColorAttachment)
{
    auto view = convertToBacking(renderPassColorAttachment.view);
    if (!view)
        return std::nullopt;

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

    auto loadValue = WTF::switchOn(renderPassColorAttachment.loadValue, [] (PAL::WebGPU::LoadOp loadOp) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, ColorDict>> {
        return { { loadOp } };
    }, [] (const Vector<double>& vector) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, ColorDict>> {
        return { { vector } };
    }, [this] (const PAL::WebGPU::ColorDict& colorDict) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, ColorDict>> {
        auto backingColorDict = convertToBacking(colorDict);
        if (!backingColorDict)
            return std::nullopt;
        return { { WTFMove(*backingColorDict) } };
    });
    if (!loadValue)
        return std::nullopt;

    return { { view, resolveTarget, WTFMove(*loadValue), renderPassColorAttachment.storeOp } };
}

std::optional<PAL::WebGPU::RenderPassColorAttachment> ConvertFromBackingContext::convertFromBacking(const RenderPassColorAttachment& renderPassColorAttachment)
{
    auto* view = convertTextureViewFromBacking(renderPassColorAttachment.view);
    if (!view)
        return std::nullopt;

    PAL::WebGPU::TextureView* resolveTarget = nullptr;
    if (renderPassColorAttachment.resolveTarget) {
        resolveTarget = convertTextureViewFromBacking(renderPassColorAttachment.resolveTarget);
        if (!resolveTarget)
            return std::nullopt;
    }

    auto loadValue = WTF::switchOn(renderPassColorAttachment.loadValue, [] (PAL::WebGPU::LoadOp loadOp) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, PAL::WebGPU::ColorDict>> {
        return { { loadOp } };
    }, [] (const Vector<double>& vector) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, PAL::WebGPU::ColorDict>> {
        return { { vector } };
    }, [this] (const ColorDict& colorDict) -> std::optional<std::variant<PAL::WebGPU::LoadOp, Vector<double>, PAL::WebGPU::ColorDict>> {
        auto backingColorDict = convertFromBacking(colorDict);
        if (!backingColorDict)
            return std::nullopt;
        return { { WTFMove(*backingColorDict) } };
    });
    if (!loadValue)
        return std::nullopt;

    return { { *view, resolveTarget, WTFMove(*loadValue), renderPassColorAttachment.storeOp } };
}

} // namespace WebKit

#endif // ENABLE(GPU_PROCESS)