// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <d3d11.h>
#include <wrl.h>

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/memory/ptr_util.h"
#include "gpu/ipc/common/gpu_memory_buffer_impl_dxgi.h"
#include "gpu/ipc/common/gpu_memory_buffer_support.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gl/gl_angle_util_win.h"
#include "ui/gl/gl_switches.h"

namespace gpu {

GpuMemoryBufferImplDXGI::~GpuMemoryBufferImplDXGI() {}

std::unique_ptr<GpuMemoryBufferImplDXGI>
GpuMemoryBufferImplDXGI::CreateFromHandle(
    const gfx::GpuMemoryBufferHandle& handle,
    const gfx::Size& size,
    gfx::BufferFormat format,
    gfx::BufferUsage usage,
    const DestructionCallback& callback) {
  DCHECK(handle.dxgi_handle.IsValid());
  return base::WrapUnique(new GpuMemoryBufferImplDXGI(
      handle.id, size, format, callback,
      base::win::ScopedHandle(handle.dxgi_handle.GetHandle())));
}

base::Closure GpuMemoryBufferImplDXGI::AllocateForTesting(
    const gfx::Size& size,
    gfx::BufferFormat format,
    gfx::BufferUsage usage,
    gfx::GpuMemoryBufferHandle* handle) {
  // This test only works with hardware rendering.
  DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kUseGpuInTests));

  Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device =
      gl::QueryD3D11DeviceObjectFromANGLE();

  DCHECK(format == gfx::BufferFormat::RGBA_8888 ||
         format == gfx::BufferFormat::RGBX_8888);
  DCHECK(usage == gfx::BufferUsage::GPU_READ ||
         usage == gfx::BufferUsage::SCANOUT);

  D3D11_TEXTURE2D_DESC desc = {
      size.width(),
      size.height(),
      1,
      1,
      DXGI_FORMAT_R8G8B8A8_UNORM,
      {1, 0},
      D3D11_USAGE_DEFAULT,
      D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET,
      0,
      D3D11_RESOURCE_MISC_SHARED_NTHANDLE |
          D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX};

  Microsoft::WRL::ComPtr<ID3D11Texture2D> d3d11_texture;

  HRESULT hr = d3d11_device->CreateTexture2D(&desc, nullptr,
                                             d3d11_texture.GetAddressOf());
  DCHECK(SUCCEEDED(hr));

  Microsoft::WRL::ComPtr<IDXGIResource1> dxgi_resource;
  hr = d3d11_texture.CopyTo(dxgi_resource.GetAddressOf());
  DCHECK(SUCCEEDED(hr));

  HANDLE texture_handle;
  hr = dxgi_resource->CreateSharedHandle(
      nullptr, DXGI_SHARED_RESOURCE_READ | DXGI_SHARED_RESOURCE_WRITE, nullptr,
      &texture_handle);
  DCHECK(SUCCEEDED(hr));

  gfx::GpuMemoryBufferId kBufferId(1);
  handle->dxgi_handle = IPC::PlatformFileForTransit(texture_handle);
  handle->type = gfx::DXGI_SHARED_HANDLE;
  handle->id = kBufferId;
  return base::DoNothing();
}

bool GpuMemoryBufferImplDXGI::Map() {
  return false;  // The current implementation doesn't support mapping.
}

void* GpuMemoryBufferImplDXGI::memory(size_t plane) {
  return nullptr;  // The current implementation doesn't support mapping.
}

void GpuMemoryBufferImplDXGI::Unmap() {}

int GpuMemoryBufferImplDXGI::stride(size_t plane) const {
  return gfx::RowSizeForBufferFormat(size_.width(), format_, plane);
}

gfx::GpuMemoryBufferType GpuMemoryBufferImplDXGI::GetType() const {
  return gfx::DXGI_SHARED_HANDLE;
}

gfx::GpuMemoryBufferHandle GpuMemoryBufferImplDXGI::CloneHandle() const {
  gfx::GpuMemoryBufferHandle handle;
  handle.type = gfx::DXGI_SHARED_HANDLE;
  handle.id = id_;
  handle.offset = 0;
  handle.stride = stride(0);
  base::ProcessHandle process = ::GetCurrentProcess();
  HANDLE duplicated_handle;
  BOOL result =
      ::DuplicateHandle(process, dxgi_handle_.Get(), process,
                        &duplicated_handle, 0, FALSE, DUPLICATE_SAME_ACCESS);
  if (!result)
    DPLOG(ERROR) << "Failed to duplicate DXGI resource handle.";
  handle.dxgi_handle = IPC::PlatformFileForTransit(duplicated_handle);
  return handle;
}

GpuMemoryBufferImplDXGI::GpuMemoryBufferImplDXGI(
    gfx::GpuMemoryBufferId id,
    const gfx::Size& size,
    gfx::BufferFormat format,
    const DestructionCallback& callback,
    base::win::ScopedHandle dxgi_handle)
    : GpuMemoryBufferImpl(id, size, format, callback),
      dxgi_handle_(std::move(dxgi_handle)) {}

}  // namespace gpu