// Copyright 2017 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "dawn_native/ComputePipeline.h"

#include "dawn_native/Device.h"
#include "dawn_native/ObjectContentHasher.h"
#include "dawn_native/ObjectType_autogen.h"

namespace dawn_native {

    MaybeError ValidateComputePipelineDescriptor(DeviceBase* device,
                                                 const ComputePipelineDescriptor* descriptor) {
        if (descriptor->nextInChain != nullptr) {
            return DAWN_VALIDATION_ERROR("nextInChain must be nullptr");
        }

        if (descriptor->layout != nullptr) {
            DAWN_TRY(device->ValidateObject(descriptor->layout));
        }

        return ValidateProgrammableStage(
            device, descriptor->compute.module, descriptor->compute.entryPoint,
            descriptor->compute.constantCount, descriptor->compute.constants, descriptor->layout,
            SingleShaderStage::Compute);
    }

    // ComputePipelineBase

    ComputePipelineBase::ComputePipelineBase(DeviceBase* device,
                                             const ComputePipelineDescriptor* descriptor)
        : PipelineBase(device,
                       descriptor->layout,
                       descriptor->label,
                       {{SingleShaderStage::Compute, descriptor->compute.module,
                         descriptor->compute.entryPoint, descriptor->compute.constantCount,
                         descriptor->compute.constants}}) {
        SetContentHash(ComputeContentHash());
    }

    ComputePipelineBase::ComputePipelineBase(DeviceBase* device, ObjectBase::ErrorTag tag)
        : PipelineBase(device, tag) {
    }

    ComputePipelineBase::~ComputePipelineBase() {
        // Do not uncache the actual cached object if we are a blueprint
        if (IsCachedReference()) {
            GetDevice()->UncacheComputePipeline(this);
        }
    }

    // static
    ComputePipelineBase* ComputePipelineBase::MakeError(DeviceBase* device) {
        class ErrorComputePipeline final : public ComputePipelineBase {
          public:
            ErrorComputePipeline(DeviceBase* device)
                : ComputePipelineBase(device, ObjectBase::kError) {
            }

            MaybeError Initialize() override {
                UNREACHABLE();
                return {};
            }
        };

        return new ErrorComputePipeline(device);
    }

    ObjectType ComputePipelineBase::GetType() const {
        return ObjectType::ComputePipeline;
    }

    bool ComputePipelineBase::EqualityFunc::operator()(const ComputePipelineBase* a,
                                                       const ComputePipelineBase* b) const {
        return PipelineBase::EqualForCache(a, b);
    }

}  // namespace dawn_native