// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "gpu/config/gpu_info_collector.h"

#include "base/android/build_info.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"

namespace {

std::string GetDriverVersionFromString(const std::string& version_string) {
  // Extract driver version from the second number in a string like:
  // "OpenGL ES 2.0 V@6.0 AU@ (CL@2946718)"

  // Exclude first "2.0".
  size_t begin = version_string.find_first_of("0123456789");
  if (begin == std::string::npos)
    return "0";
  size_t end = version_string.find_first_not_of("01234567890.", begin);

  // Extract number of the form "%d.%d"
  begin = version_string.find_first_of("0123456789", end);
  if (begin == std::string::npos)
    return "0";
  end = version_string.find_first_not_of("01234567890.", begin);
  std::string sub_string;
  if (end != std::string::npos)
    sub_string = version_string.substr(begin, end - begin);
  else
    sub_string = version_string.substr(begin);
  std::vector<std::string> pieces;
  base::SplitString(sub_string, '.', &pieces);
  if (pieces.size() < 2)
    return "0";
  return pieces[0] + "." + pieces[1];
}

}

namespace gpu {

bool CollectContextGraphicsInfo(GPUInfo* gpu_info) {
  return CollectBasicGraphicsInfo(gpu_info);
}

GpuIDResult CollectGpuID(uint32* vendor_id, uint32* device_id) {
  DCHECK(vendor_id && device_id);
  *vendor_id = 0;
  *device_id = 0;
  return kGpuIDNotSupported;
}

bool CollectBasicGraphicsInfo(GPUInfo* gpu_info) {
  gpu_info->can_lose_context = false;
  gpu_info->finalized = true;

  gpu_info->machine_model = base::android::BuildInfo::GetInstance()->model();

  // Create a short-lived context on the UI thread to collect the GL strings.
  return CollectGraphicsInfoGL(gpu_info);
}

bool CollectDriverInfoGL(GPUInfo* gpu_info) {
  gpu_info->driver_version = GetDriverVersionFromString(
      gpu_info->gl_version_string);
  return true;
}

void MergeGPUInfo(GPUInfo* basic_gpu_info,
                  const GPUInfo& context_gpu_info) {
  MergeGPUInfoGL(basic_gpu_info, context_gpu_info);
}

}  // namespace gpu