// Copyright 2013 Blender Foundation. All rights reserved.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// Author: Sergey Sharybin
// Contributor(s): Brecht van Lommel

#include "opensubdiv_capi.h"

#ifdef _MSC_VER
#  include <iso646.h>
#endif

#include <GL/glew.h>

#include "opensubdiv_device_context_opencl.h"
#include "opensubdiv_device_context_cuda.h"
#include "opensubdiv_gl_mesh_capi.h"

void openSubdiv_init(void) {
  // Ensure all OpenGL strings are cached.
  openSubdiv_getAvailableEvaluators();
}

void openSubdiv_cleanup(void) {
  openSubdiv_deinitGLMeshDrawingResources();
}

int openSubdiv_getAvailableEvaluators(void) {
  int flags = OPENSUBDIV_EVALUATOR_CPU;

#ifdef OPENSUBDIV_HAS_OPENMP
  flags |= OPENSUBDIV_EVALUATOR_OPENMP;
#endif

#ifdef OPENSUBDIV_HAS_OPENCL
  if (CLDeviceContext::HAS_CL_VERSION_1_1()) {
    flags |= OPENSUBDIV_EVALUATOR_OPENCL;
  }
#endif

#ifdef OPENSUBDIV_HAS_CUDA
  if (CudaDeviceContext::HAS_CUDA_VERSION_4_0()) {
    flags |= OPENSUBDIV_EVALUATOR_CUDA;
  }
#endif

#ifdef OPENSUBDIV_HAS_GLSL_TRANSFORM_FEEDBACK
  if (GLEW_VERSION_4_1) {
    flags |= OPENSUBDIV_EVALUATOR_GLSL_TRANSFORM_FEEDBACK;
  }
#endif

#ifdef OPENSUBDIV_HAS_GLSL_COMPUTE
  if (GLEW_VERSION_4_3 || GLEW_ARB_compute_shader) {
    flags |= OPENSUBDIV_EVALUATOR_GLSL_COMPUTE;
  }
#endif

  return flags;
}

int openSubdiv_getVersionHex(void) {
#if defined(OPENSUBDIV_VERSION_NUMBER)
  return OPENSUBDIV_VERSION_NUMBER;
#elif defined(OPENSUBDIV_VERSION_MAJOR)
  return OPENSUBDIV_VERSION_MAJOR * 10000 +
         OPENSUBDIV_VERSION_MINOR * 100 +
         OPENSUBDIV_VERSION_PATCH;
#elif defined(OPENSUBDIV_VERSION)
  const char* version = STRINGIFY(OPENSUBDIV_VERSION);
  if (version[0] == 'v') {
    version += 1;
  }
  int major = 0, minor = 0, patch = 0;
  vector<string> tokens;
  opensubdiv_capi::stringSplit(&tokens, version, "_", true);
  if (tokens.size() == 3) {
    major = atoi(tokens[0].c_str());
    minor = atoi(tokens[1].c_str());
    patch = atoi(tokens[2].c_str());
  }
  return major * 10000 + minor * 100 + patch;
#else
  return 0;
#endif
}