/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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 "RenderMacIOSurfaceTextureHostOGL.h"

#include "GLContextCGL.h"
#include "mozilla/gfx/Logging.h"
#include "ScopedGLHelpers.h"

namespace mozilla {
namespace wr {

static CGLError
CreateTextureForPlane(uint8_t aPlaneID, gl::GLContext* aGL, MacIOSurface* aSurface, GLuint* aTexture)
{
  MOZ_ASSERT(aGL && aSurface && aTexture);

  aGL->fGenTextures(1, aTexture);
  aGL->fActiveTexture(LOCAL_GL_TEXTURE0);
  aGL->fBindTexture(LOCAL_GL_TEXTURE_RECTANGLE_ARB, *aTexture);
  aGL->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB, LOCAL_GL_TEXTURE_WRAP_T, LOCAL_GL_CLAMP_TO_EDGE);
  aGL->fTexParameteri(LOCAL_GL_TEXTURE_RECTANGLE_ARB, LOCAL_GL_TEXTURE_WRAP_S, LOCAL_GL_CLAMP_TO_EDGE);

  CGLError result = kCGLNoError;
  gfx::SurfaceFormat readFormat = gfx::SurfaceFormat::UNKNOWN;
  result = aSurface->CGLTexImageIOSurface2D(aGL,
                                            gl::GLContextCGL::Cast(aGL)->GetCGLContext(),
                                            aPlaneID,
                                            &readFormat);
  // If this is a yuv format, the Webrender only supports YUV422 interleaving format.
  MOZ_ASSERT(aSurface->GetFormat() != gfx::SurfaceFormat::YUV422 || readFormat == gfx::SurfaceFormat::YUV422);

  return result;
}

RenderMacIOSurfaceTextureHostOGL::RenderMacIOSurfaceTextureHostOGL(MacIOSurface* aSurface)
  : mSurface(aSurface)
  , mTextureHandles{ 0, 0, 0 }
{
  MOZ_COUNT_CTOR_INHERITED(RenderMacIOSurfaceTextureHostOGL, RenderTextureHostOGL);
}

RenderMacIOSurfaceTextureHostOGL::~RenderMacIOSurfaceTextureHostOGL()
{
  MOZ_COUNT_DTOR_INHERITED(RenderMacIOSurfaceTextureHostOGL, RenderTextureHostOGL);
  DeleteTextureHandle();
}

GLuint
RenderMacIOSurfaceTextureHostOGL::GetGLHandle(uint8_t aChannelIndex) const
{
  MOZ_ASSERT(mSurface);
  MOZ_ASSERT((mSurface->GetPlaneCount() == 0) ? (aChannelIndex == mSurface->GetPlaneCount())
                                              : (aChannelIndex < mSurface->GetPlaneCount()));
  return mTextureHandles[aChannelIndex];
}

gfx::IntSize
RenderMacIOSurfaceTextureHostOGL::GetSize(uint8_t aChannelIndex) const
{
  MOZ_ASSERT(mSurface);
  MOZ_ASSERT((mSurface->GetPlaneCount() == 0) ? (aChannelIndex == mSurface->GetPlaneCount())
                                              : (aChannelIndex < mSurface->GetPlaneCount()));

  if (!mSurface) {
    return gfx::IntSize();
  }
  return gfx::IntSize(mSurface->GetDevicePixelWidth(aChannelIndex),
                      mSurface->GetDevicePixelHeight(aChannelIndex));
}

bool
RenderMacIOSurfaceTextureHostOGL::Lock()
{
  if (!mSurface || !mGL || !mGL->MakeCurrent()) {
    return false;
  }

  if (!mTextureHandles[0]) {
    MOZ_ASSERT(gl::GLContextCGL::Cast(mGL.get())->GetCGLContext());

    // The result of GetPlaneCount() is 0 for single plane format, but it will
    // be 2 if the format has 2 planar data.
    CreateTextureForPlane(0, mGL, mSurface, &(mTextureHandles[0]));
    for (size_t i = 1; i < mSurface->GetPlaneCount(); ++i) {
      CreateTextureForPlane(i, mGL, mSurface, &(mTextureHandles[i]));
    }
  }

  return true;
}

void
RenderMacIOSurfaceTextureHostOGL::Unlock()
{

}

void
RenderMacIOSurfaceTextureHostOGL::SetGLContext(gl::GLContext* aContext)
{
  if (mGL.get() != aContext) {
    // release the texture handle in the previous gl context
    DeleteTextureHandle();
    mGL = aContext;
  }
}

void
RenderMacIOSurfaceTextureHostOGL::DeleteTextureHandle()
{
  if (mTextureHandles[0] != 0 && mGL && mGL->MakeCurrent()) {
    // Calling glDeleteTextures on 0 isn't an error. So, just make them a single
    // call.
    mGL->fDeleteTextures(3, mTextureHandles);
    for (size_t i = 0; i < 3; ++i) {
      mTextureHandles[i] = 0;
    }
  }
}

} // namespace wr
} // namespace mozilla