// 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/Texture.h"

#include "common/Assert.h"
#include "dawn_native/Device.h"
#include "dawn_native/ValidationUtils_autogen.h"

namespace dawn_native {
    MaybeError ValidateTextureDescriptor(DeviceBase*, const TextureDescriptor* descriptor) {
        if (descriptor->nextInChain != nullptr) {
            return DAWN_VALIDATION_ERROR("nextInChain must be nullptr");
        }

        DAWN_TRY(ValidateTextureUsageBit(descriptor->usage));
        DAWN_TRY(ValidateTextureDimension(descriptor->dimension));
        DAWN_TRY(ValidateTextureFormat(descriptor->format));

        // TODO(jiawei.shao@intel.com): check stuff based on the dimension
        if (descriptor->width == 0 || descriptor->height == 0 || descriptor->depth == 0 ||
            descriptor->arrayLayer == 0 || descriptor->mipLevel == 0) {
            return DAWN_VALIDATION_ERROR("Cannot create an empty texture");
        }

        return {};
    }

    uint32_t TextureFormatPixelSize(dawn::TextureFormat format) {
        switch (format) {
            case dawn::TextureFormat::R8Unorm:
            case dawn::TextureFormat::R8Uint:
                return 1;
            case dawn::TextureFormat::R8G8Unorm:
            case dawn::TextureFormat::R8G8Uint:
                return 2;
            case dawn::TextureFormat::R8G8B8A8Unorm:
            case dawn::TextureFormat::R8G8B8A8Uint:
            case dawn::TextureFormat::B8G8R8A8Unorm:
                return 4;
            case dawn::TextureFormat::D32FloatS8Uint:
                return 8;
            default:
                UNREACHABLE();
        }
    }

    bool TextureFormatHasDepth(dawn::TextureFormat format) {
        switch (format) {
            case dawn::TextureFormat::D32FloatS8Uint:
                return true;
            default:
                return false;
        }
    }

    bool TextureFormatHasStencil(dawn::TextureFormat format) {
        switch (format) {
            case dawn::TextureFormat::D32FloatS8Uint:
                return true;
            default:
                return false;
        }
    }

    bool TextureFormatHasDepthOrStencil(dawn::TextureFormat format) {
        switch (format) {
            case dawn::TextureFormat::D32FloatS8Uint:
                return true;
            default:
                return false;
        }
    }

    // TextureBase

    TextureBase::TextureBase(DeviceBase* device, const TextureDescriptor* descriptor)
        : mDevice(device),
          mDimension(descriptor->dimension),
          mFormat(descriptor->format),
          mWidth(descriptor->width),
          mHeight(descriptor->height),
          mDepth(descriptor->depth),
          mArrayLayers(descriptor->arrayLayer),
          mNumMipLevels(descriptor->mipLevel),
          mUsage(descriptor->usage) {
    }

    DeviceBase* TextureBase::GetDevice() const {
        return mDevice;
    }

    dawn::TextureDimension TextureBase::GetDimension() const {
        return mDimension;
    }
    dawn::TextureFormat TextureBase::GetFormat() const {
        return mFormat;
    }
    uint32_t TextureBase::GetWidth() const {
        return mWidth;
    }
    uint32_t TextureBase::GetHeight() const {
        return mHeight;
    }
    uint32_t TextureBase::GetDepth() const {
        return mDepth;
    }
    uint32_t TextureBase::GetArrayLayers() const {
        return mArrayLayers;
    }
    uint32_t TextureBase::GetNumMipLevels() const {
        return mNumMipLevels;
    }
    dawn::TextureUsageBit TextureBase::GetUsage() const {
        return mUsage;
    }

    TextureViewBase* TextureBase::CreateDefaultTextureView() {
        return mDevice->CreateDefaultTextureView(this);
    }

    // TextureViewBase

    TextureViewBase::TextureViewBase(TextureBase* texture) : mTexture(texture) {
    }

    const TextureBase* TextureViewBase::GetTexture() const {
        return mTexture.Get();
    }

    TextureBase* TextureViewBase::GetTexture() {
        return mTexture.Get();
    }

}  // namespace dawn_native