/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 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 "CompositingRenderTargetOGL.h"

#include "GLContext.h"

#include "GLReadTexImageHelper.h"

#include "ScopedGLHelpers.h"

#include "mozilla/gfx/2D.h"

namespace mozilla {

namespace layers {

using namespace mozilla::gfx;

using namespace mozilla::gl;

CompositingRenderTargetOGL::~CompositingRenderTargetOGL()

{

  if (mGL && mGL->MakeCurrent()) {

    mGL->fDeleteTextures(1, &mTextureHandle);

    mGL->fDeleteFramebuffers(1, &mFBO);

  }

}

void

CompositingRenderTargetOGL::BindTexture(GLenum aTextureUnit, GLenum aTextureTarget)

{

  MOZ_ASSERT(mInitParams.mStatus == InitParams::INITIALIZED);

  MOZ_ASSERT(mTextureHandle != 0);

  mGL->fActiveTexture(aTextureUnit);

  mGL->fBindTexture(aTextureTarget, mTextureHandle);

}

void

CompositingRenderTargetOGL::BindRenderTarget()

{

  bool needsClear = false;

  if (mInitParams.mStatus != InitParams::INITIALIZED) {

    InitializeImpl();

    if (mInitParams.mInit == INIT_MODE_CLEAR) {

      needsClear = true;

      mClearOnBind = false;

    }

  } else {

    MOZ_ASSERT(mInitParams.mStatus == InitParams::INITIALIZED);

    GLuint fbo = mFBO == 0 ? mGL->GetDefaultFramebuffer() : mFBO;

    mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fbo);

    GLenum result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);

    if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {

      // The main framebuffer (0) of non-offscreen contexts

      // might be backed by a EGLSurface that needs to be renewed.

      if (mFBO == 0 && !mGL->IsOffscreen()) {

        mGL->RenewSurface(mCompositor->GetWidget());

        result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);

      }

      if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {

        nsAutoCString msg;

        msg.AppendPrintf("Framebuffer not complete -- CheckFramebufferStatus returned 0x%x, "

                         "GLContext=%p, IsOffscreen()=%d, mFBO=%d, aFBOTextureTarget=0x%x, "

                         "aRect.width=%d, aRect.height=%d",

                         result, mGL.get(), mGL->IsOffscreen(), mFBO, mInitParams.mFBOTextureTarget,

                         mInitParams.mSize.width, mInitParams.mSize.height);

        NS_WARNING(msg.get());

      }

    }

    needsClear = mClearOnBind;

  }

  if (needsClear) {

    ScopedGLState scopedScissorTestState(mGL, LOCAL_GL_SCISSOR_TEST, true);

    ScopedScissorRect autoScissorRect(mGL, 0, 0, mInitParams.mSize.width,

                                      mInitParams.mSize.height);

    mGL->fClearColor(0.0, 0.0, 0.0, 0.0);

    mGL->fClearDepth(0.0);

    mGL->fClear(LOCAL_GL_COLOR_BUFFER_BIT | LOCAL_GL_DEPTH_BUFFER_BIT);

  }

}

#ifdef MOZ_DUMP_PAINTING

already_AddRefed<DataSourceSurface>

CompositingRenderTargetOGL::Dump(Compositor* aCompositor)

{

  MOZ_ASSERT(mInitParams.mStatus == InitParams::INITIALIZED);

  CompositorOGL* compositorOGL = aCompositor->AsCompositorOGL();

  return ReadBackSurface(mGL, mTextureHandle, true, compositorOGL->GetFBOFormat());

}

#endif

void

CompositingRenderTargetOGL::InitializeImpl()

{

  MOZ_ASSERT(mInitParams.mStatus == InitParams::READY);

  //TODO: call mGL->GetBackbufferFB(), use that

  GLuint fbo = mFBO == 0 ? mGL->GetDefaultFramebuffer() : mFBO;

  mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, fbo);

  mGL->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,

                              LOCAL_GL_COLOR_ATTACHMENT0,

                              mInitParams.mFBOTextureTarget,

                              mTextureHandle,

                              0);

  // Making this call to fCheckFramebufferStatus prevents a crash on

  // PowerVR. See bug 695246.

  GLenum result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);

  if (result != LOCAL_GL_FRAMEBUFFER_COMPLETE) {

    nsAutoCString msg;

    msg.AppendPrintf("Framebuffer not complete -- error 0x%x, aFBOTextureTarget 0x%x, mFBO %d, mTextureHandle %d, aRect.width %d, aRect.height %d",

                      result, mInitParams.mFBOTextureTarget, mFBO, mTextureHandle, mInitParams.mSize.width, mInitParams.mSize.height);

    NS_ERROR(msg.get());

  }

  mInitParams.mStatus = InitParams::INITIALIZED;

}

} // namespace layers

} // namespace mozilla