/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2019 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#if !defined(ORTHANC_ENABLE_OPENGL)
#  error The macro ORTHANC_ENABLE_OPENGL must be defined
#endif

#if ORTHANC_ENABLE_OPENGL != 1
#  error Support for OpenGL is disabled
#endif

#if defined(__APPLE__)
#  include <OpenGL/gl.h>
#  include <OpenGL/glext.h>
#elif defined(_WIN32)
// On Windows, use the compatibility headers provided by glew
#  include <GL/glew.h>
#else
#  include <GL/gl.h>
#  include <GL/glext.h>
#endif

#if ORTHANC_ENABLE_QT == 1
// TODO: currently there are no checks in QT

#   define ORTHANC_OPENGL_CHECK(name)
#   define ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT(msg)
#   define ORTHANC_CHECK_CURRENT_CONTEXT(context)

#endif

#if ORTHANC_ENABLE_SDL == 1
# include <SDL_video.h>

# ifdef NDEBUG

// glGetError is very expensive!

#   define ORTHANC_OPENGL_CHECK(name)
#   define ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT(msg)

# else 

#   define ORTHANC_OPENGL_CHECK(name) \
if(true)                                                                                                                                \
{                                                                                                                                       \
  GLenum error = glGetError();                                                                                                          \
  if (error != GL_NO_ERROR) {                                                                                                           \
    SDL_GLContext ctx = SDL_GL_GetCurrentContext();                                                                                     \
    LOG(ERROR) << "Error when calling " << name << " | current context is: 0x" << std::hex << ctx <<  " | error code is " << error;     \
    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,"OpenGL error in " name " | See log.");                            \
  }                                                                                                                                     \
} else (void)0

#   define ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT(msg)                          \
if(true)                                                                   \
{                                                                          \
  SDL_GLContext ctx = SDL_GL_GetCurrentContext();                          \
  LOG(TRACE) << msg << " | Current OpenGL context is " << std::hex << ctx; \
} else (void)0

# endif

#endif

#if ORTHANC_ENABLE_WASM == 1
#include <emscripten/html5.h>

#define ORTHANC_OPENGL_CHECK(name) \
if(true)                                                                                                                                                                                    \
{                                                                                                                                                                                           \
  GLenum error = glGetError();                                                                                                                                                              \
  if (error != GL_NO_ERROR) {                                                                                                                                                               \
    EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_get_current_context();                                                                                                           \
    EM_BOOL lost = emscripten_is_webgl_context_lost(ctx);                                                                                                                                   \
    LOG(ERROR) << "Error when calling " << name << " | current context is: 0x" << std::hex << ctx <<  " | error code is " << error << " | emscripten_is_webgl_context_lost = " << lost;     \
    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,"OpenGL error in " name " | See log.");                                                                                \
  }                                                                                                                                                                                         \
} else (void)0

#define ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT(msg)                                 \
if(true)                                                                          \
{                                                                                 \
  EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_get_current_context();   \
  LOG(TRACE) << msg << " | Current OpenGL context is " << std::hex << ctx;        \
} else (void)0

#define ORTHANC_CHECK_CURRENT_CONTEXT(context)                                                                                                         \
if(true)                                                                                                                                               \
{                                                                                                                                                      \
  EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_get_current_context();                                                                        \
  void* actualCtx = reinterpret_cast<void*>(ctx);                                                                                                      \
  void* expectedCtx = context.DebugGetInternalContext();                                                                                               \
  if(expectedCtx != actualCtx)                                                                                                                         \
  {                                                                                                                                                    \
    LOG(ERROR) << "Expected context was " << std::hex << expectedCtx << " while actual context is " << std::hex << actualCtx;                          \
  }                                                                                                                                                    \
} else (void)0

#endif