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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GLBlitHelper.h"

#include <d3d11.h>

#include "GLContext.h"
#include "GLLibraryEGL.h"
#include "GPUVideoImage.h"
#include "ScopedGLHelpers.h"

#include "mozilla/layers/D3D11YCbCrImage.h"
#include "mozilla/layers/TextureD3D11.h"

namespace mozilla {
namespace gl {

static EGLStreamKHR StreamFromD3DTexture(ID3D11Texture2D* const texD3D,
                                         const EGLAttrib* const postAttribs) {
  auto& egl = sEGLLibrary;
  if (!egl.IsExtensionSupported(
          GLLibraryEGL::NV_stream_consumer_gltexture_yuv) ||
      !egl.IsExtensionSupported(
          GLLibraryEGL::ANGLE_stream_producer_d3d_texture)) {
    return 0;
  }

  const auto& display = egl.Display();
  const auto stream = egl.fCreateStreamKHR(display, nullptr);
  MOZ_ASSERT(stream);
  if (!stream) return 0;
  bool ok = true;
  MOZ_ALWAYS_TRUE(ok &= bool(egl.fStreamConsumerGLTextureExternalAttribsNV(
                      display, stream, nullptr)));
  MOZ_ALWAYS_TRUE(ok &= bool(egl.fCreateStreamProducerD3DTextureANGLE(
                      display, stream, nullptr)));
  MOZ_ALWAYS_TRUE(ok &= bool(egl.fStreamPostD3DTextureANGLE(
                      display, stream, texD3D, postAttribs)));
  if (ok) return stream;

  (void)egl.fDestroyStreamKHR(display, stream);
  return 0;
}

static RefPtr<ID3D11Texture2D> OpenSharedTexture(ID3D11Device* const d3d,
                                                 const WindowsHandle handle) {
  RefPtr<ID3D11Texture2D> tex;
  auto hr =
      d3d->OpenSharedResource((HANDLE)handle, __uuidof(ID3D11Texture2D),
                              (void**)(ID3D11Texture2D**)getter_AddRefs(tex));
  if (FAILED(hr)) {
    gfxCriticalError() << "Error code from OpenSharedResource: "
                       << gfx::hexa(hr);
    return nullptr;
  }
  return tex;
}

// -------------------------------------

class BindAnglePlanes final {
  const GLBlitHelper& mParent;
  const uint8_t mNumPlanes;
  const ScopedSaveMultiTex mMultiTex;
  GLuint mTempTexs[3];
  EGLStreamKHR mStreams[3];
  RefPtr<IDXGIKeyedMutex> mMutexList[3];
  bool mSuccess;

 public:
  BindAnglePlanes(const GLBlitHelper* const parent, const uint8_t numPlanes,
                  const RefPtr<ID3D11Texture2D>* const texD3DList,
                  const EGLAttrib* const* postAttribsList = nullptr)
      : mParent(*parent),
        mNumPlanes(numPlanes),
        mMultiTex(mParent.mGL, mNumPlanes, LOCAL_GL_TEXTURE_EXTERNAL),
        mTempTexs{0},
        mStreams{0},
        mSuccess(true) {
    MOZ_RELEASE_ASSERT(numPlanes >= 1 && numPlanes <= 3);

    const auto& gl = mParent.mGL;
    auto& egl = sEGLLibrary;
    const auto& display = egl.Display();

    gl->fGenTextures(numPlanes, mTempTexs);

    for (uint8_t i = 0; i < mNumPlanes; i++) {
      gl->fActiveTexture(LOCAL_GL_TEXTURE0 + i);
      gl->fBindTexture(LOCAL_GL_TEXTURE_EXTERNAL, mTempTexs[i]);
      const EGLAttrib* postAttribs = nullptr;
      if (postAttribsList) {
        postAttribs = postAttribsList[i];
      }
      mStreams[i] = StreamFromD3DTexture(texD3DList[i], postAttribs);
      mSuccess &= bool(mStreams[i]);
    }

    if (mSuccess) {
      for (uint8_t i = 0; i < mNumPlanes; i++) {
        MOZ_ALWAYS_TRUE(egl.fStreamConsumerAcquireKHR(display, mStreams[i]));

        auto& mutex = mMutexList[i];
        texD3DList[i]->QueryInterface(IID_IDXGIKeyedMutex,
                                      (void**)getter_AddRefs(mutex));
        if (mutex) {
          const auto hr = mutex->AcquireSync(0, 100);
          if (FAILED(hr)) {
            NS_WARNING("BindAnglePlanes failed to acquire KeyedMutex.");
            mSuccess = false;
          }
        }
      }
    }
  }

  ~BindAnglePlanes() {
    const auto& gl = mParent.mGL;
    auto& egl = sEGLLibrary;
    const auto& display = egl.Display();

    if (mSuccess) {
      for (uint8_t i = 0; i < mNumPlanes; i++) {
        MOZ_ALWAYS_TRUE(egl.fStreamConsumerReleaseKHR(display, mStreams[i]));
        if (mMutexList[i]) {
          mMutexList[i]->ReleaseSync(0);
        }
      }
    }

    for (uint8_t i = 0; i < mNumPlanes; i++) {
      (void)egl.fDestroyStreamKHR(display, mStreams[i]);
    }

    gl->fDeleteTextures(mNumPlanes, mTempTexs);
  }

  const bool& Success() const { return mSuccess; }
};

// -------------------------------------

ID3D11Device* GLBlitHelper::GetD3D11() const {
  if (mD3D11) return mD3D11;

  if (!mGL->IsANGLE()) return nullptr;

  auto& egl = sEGLLibrary;
  EGLDeviceEXT deviceEGL = 0;
  MOZ_ALWAYS_TRUE(egl.fQueryDisplayAttribEXT(
      egl.Display(), LOCAL_EGL_DEVICE_EXT, (EGLAttrib*)&deviceEGL));
  if (!egl.fQueryDeviceAttribEXT(
          deviceEGL, LOCAL_EGL_D3D11_DEVICE_ANGLE,
          (EGLAttrib*)(ID3D11Device**)getter_AddRefs(mD3D11))) {
    MOZ_ASSERT(false, "d3d9?");
    return nullptr;
  }
  return mD3D11;
}

// -------------------------------------

bool GLBlitHelper::BlitImage(layers::GPUVideoImage* const srcImage,
                             const gfx::IntSize& destSize,
                             const OriginPos destOrigin) const {
  const auto& data = srcImage->GetData();
  if (!data) return false;

  const auto& desc = data->SD();
  const auto& subdescUnion = desc.subdesc();
  switch (subdescUnion.type()) {
    case layers::GPUVideoSubDescriptor::TSurfaceDescriptorD3D10: {
      const auto& subdesc = subdescUnion.get_SurfaceDescriptorD3D10();
      return BlitDescriptor(subdesc, destSize, destOrigin);
    }
    case layers::GPUVideoSubDescriptor::TSurfaceDescriptorDXGIYCbCr: {
      const auto& subdesc = subdescUnion.get_SurfaceDescriptorDXGIYCbCr();

      const auto& clipSize = subdesc.size();
      const auto& ySize = subdesc.sizeY();
      const auto& uvSize = subdesc.sizeCbCr();
      const auto& colorSpace = subdesc.yUVColorSpace();

      const gfx::IntRect clipRect(0, 0, clipSize.width, clipSize.height);

      const WindowsHandle handles[3] = {subdesc.handleY(), subdesc.handleCb(),
                                        subdesc.handleCr()};
      return BlitAngleYCbCr(handles, clipRect, ySize, uvSize, colorSpace,
                            destSize, destOrigin);
    }
    default:
      gfxCriticalError() << "Unhandled subdesc type: "
                         << uint32_t(subdescUnion.type());
      return false;
  }
}

// -------------------------------------

bool GLBlitHelper::BlitImage(layers::D3D11YCbCrImage* const srcImage,
                             const gfx::IntSize& destSize,
                             const OriginPos destOrigin) const {
  const auto& data = srcImage->GetData();
  if (!data) return false;

  const WindowsHandle handles[3] = {(WindowsHandle)data->mHandles[0],
                                    (WindowsHandle)data->mHandles[1],
                                    (WindowsHandle)data->mHandles[2]};
  return BlitAngleYCbCr(handles, srcImage->mPictureRect, srcImage->mYSize,
                        srcImage->mCbCrSize, srcImage->mColorSpace, destSize,
                        destOrigin);
}

// -------------------------------------

bool GLBlitHelper::BlitDescriptor(const layers::SurfaceDescriptorD3D10& desc,
                                  const gfx::IntSize& destSize,
                                  const OriginPos destOrigin) const {
  const auto& d3d = GetD3D11();
  if (!d3d) return false;

  const auto& handle = desc.handle();
  const auto& format = desc.format();
  const auto& clipSize = desc.size();

  const auto srcOrigin = OriginPos::BottomLeft;
  const gfx::IntRect clipRect(0, 0, clipSize.width, clipSize.height);
  const auto colorSpace = YUVColorSpace::BT601;

  if (format != gfx::SurfaceFormat::NV12) {
    gfxCriticalError() << "Non-NV12 format for SurfaceDescriptorD3D10: "
                       << uint32_t(format);
    return false;
  }

  const auto tex = OpenSharedTexture(d3d, handle);
  if (!tex) {
    MOZ_ASSERT(false, "Get a nullptr from OpenSharedResource.");
    return false;
  }
  const RefPtr<ID3D11Texture2D> texList[2] = {tex, tex};
  const EGLAttrib postAttribs0[] = {LOCAL_EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG, 0,
                                    LOCAL_EGL_NONE};
  const EGLAttrib postAttribs1[] = {LOCAL_EGL_NATIVE_BUFFER_PLANE_OFFSET_IMG, 1,
                                    LOCAL_EGL_NONE};
  const EGLAttrib* const postAttribsList[2] = {postAttribs0, postAttribs1};
  // /layers/d3d11/CompositorD3D11.cpp uses bt601 for EffectTypes::NV12.
  // return BlitAngleNv12(tex, YUVColorSpace::BT601, destSize, destOrigin);

  const BindAnglePlanes bindPlanes(this, 2, texList, postAttribsList);
  if (!bindPlanes.Success()) {
    MOZ_ASSERT(false, "BindAnglePlanes failed.");
    return false;
  }

  D3D11_TEXTURE2D_DESC texDesc = {0};
  tex->GetDesc(&texDesc);

  const gfx::IntSize ySize(texDesc.Width, texDesc.Height);
  const gfx::IntSize divisors(2, 2);
  MOZ_ASSERT(ySize.width % divisors.width == 0);
  MOZ_ASSERT(ySize.height % divisors.height == 0);
  const gfx::IntSize uvSize(ySize.width / divisors.width,
                            ySize.height / divisors.height);

  const bool yFlip = destOrigin != srcOrigin;
  const DrawBlitProg::BaseArgs baseArgs = {SubRectMat3(clipRect, ySize), yFlip,
                                           destSize, Nothing()};
  const DrawBlitProg::YUVArgs yuvArgs = {
      SubRectMat3(clipRect, uvSize, divisors), colorSpace};

  const auto& prog = GetDrawBlitProg({kFragHeader_TexExt, kFragBody_NV12});
  MOZ_RELEASE_ASSERT(prog);
  prog->Draw(baseArgs, &yuvArgs);
  return true;
}

// --

bool GLBlitHelper::BlitAngleYCbCr(const WindowsHandle (&handleList)[3],
                                  const gfx::IntRect& clipRect,
                                  const gfx::IntSize& ySize,
                                  const gfx::IntSize& uvSize,
                                  const YUVColorSpace colorSpace,
                                  const gfx::IntSize& destSize,
                                  const OriginPos destOrigin) const {
  const auto& d3d = GetD3D11();
  if (!d3d) return false;

  const auto srcOrigin = OriginPos::BottomLeft;

  gfx::IntSize divisors;
  if (!GuessDivisors(ySize, uvSize, &divisors)) return false;

  const RefPtr<ID3D11Texture2D> texList[3] = {
      OpenSharedTexture(d3d, handleList[0]),
      OpenSharedTexture(d3d, handleList[1]),
      OpenSharedTexture(d3d, handleList[2])};
  const BindAnglePlanes bindPlanes(this, 3, texList);

  const bool yFlip = destOrigin != srcOrigin;
  const DrawBlitProg::BaseArgs baseArgs = {SubRectMat3(clipRect, ySize), yFlip,
                                           destSize, Nothing()};
  const DrawBlitProg::YUVArgs yuvArgs = {
      SubRectMat3(clipRect, uvSize, divisors), colorSpace};

  const auto& prog = GetDrawBlitProg({kFragHeader_TexExt, kFragBody_PlanarYUV});
  MOZ_RELEASE_ASSERT(prog);
  prog->Draw(baseArgs, &yuvArgs);
  return true;
}

}  // namespace gl
}  // namespace mozilla