// Copyright 2024 The Dawn & Tint Authors
//
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#include "dawn/native/opengl/SharedTextureMemoryGL.h"

#include <utility>

#include "dawn/native/ChainUtils.h"
#include "dawn/native/opengl/DeviceGL.h"
#include "dawn/native/opengl/QueueGL.h"
#include "dawn/native/opengl/SharedFenceGL.h"
#include "dawn/native/opengl/TextureGL.h"

namespace dawn::native::opengl {

SharedTextureMemory::SharedTextureMemory(Device* device,
                                         StringView label,
                                         const SharedTextureMemoryProperties& properties)
    : SharedTextureMemoryBase(device, label, properties) {}

ResultOrError<Ref<TextureBase>> SharedTextureMemory::CreateTextureImpl(
    const UnpackedPtr<TextureDescriptor>& descriptor) {
    return Texture::CreateFromSharedTextureMemory(this, descriptor);
}

MaybeError SharedTextureMemory::BeginAccessImpl(
    TextureBase* texture,
    const UnpackedPtr<BeginAccessDescriptor>& descriptor) {
    DAWN_TRY(descriptor.ValidateSubset<>());
    for (size_t i = 0; i < descriptor->fenceCount; ++i) {
        SharedFenceBase* fence = descriptor->fences[i];

        SharedFenceExportInfo exportInfo;
        DAWN_TRY(fence->ExportInfo(&exportInfo));
        switch (exportInfo.type) {
            case wgpu::SharedFenceType::SyncFD:
                DAWN_INVALID_IF(!GetDevice()->HasFeature(Feature::SharedFenceSyncFD),
                                "Required feature (%s) for %s is missing.",
                                wgpu::FeatureName::SharedFenceSyncFD,
                                wgpu::SharedFenceType::SyncFD);
                break;
            default:
                return DAWN_VALIDATION_ERROR("Unsupported fence type %s.", exportInfo.type);
        }

        // All GL sync objects are binary.
        DAWN_INVALID_IF(descriptor->signaledValues[i] != 1, "%s signaled value (%u) was not 1.",
                        fence, descriptor->signaledValues[i]);
    }

    return {};
}

ResultOrError<FenceAndSignalValue> SharedTextureMemory::EndAccessImpl(
    TextureBase* texture,
    ExecutionSerial lastUsageSerial,
    UnpackedPtr<EndAccessState>& state) {
    DAWN_TRY(state.ValidateSubset<>());
    DAWN_INVALID_IF(!GetDevice()->HasFeature(Feature::SharedFenceSyncFD),
                    "Required feature (%s) is missing.", wgpu::FeatureName::SharedFenceSyncFD);
    Ref<SharedFence> fence;
    DAWN_TRY_ASSIGN(fence,
                    ToBackend(GetDevice()->GetQueue())->GetOrCreateSharedFence(lastUsageSerial));
    return FenceAndSignalValue{std::move(fence), 1};
}

}  // namespace dawn::native::opengl