// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_platform
#define tools_platform

// We do not byteswap on intel (LE) (common platform).
// We have then a better compression on these machines.
// NOTE : this is the contrary to what is done in CERN-ROOT (and Rio).

/* We prefer to handle endianity dynamically, but with cpp macro
   it would looks like (from luaconf.h) :
#if defined(__i386__) || defined(__i386) || \
    defined(__X86__)  || defined (__x86_64)
#define TOOLS_IS_BE 0
#define TOOLS_IS_LE 1
#elif defined(__POWERPC__) || defined(__ppc__)
#define TOOLS_IS_BE 1
#define TOOLS_IS_LE 0
#endif
*/

namespace tools {

inline bool is_little_endian() {
  unsigned int i = 1;
  unsigned char* b = (unsigned char*)&i;
  // BE = Big Endian, LE = Little Endian.
  // The Intels x86 are LE.
  // Mac PPC b[3] is 1 (BE)
  // Mac Intel b[0] is 1 (LE)
  // Linux i386 b[0] is 1 (LE)
  // Linux x86_64 b[0] is 1 (LE)
  return (b[0]==1?true:false);
}

}

#if defined(__APPLE__)
#include <TargetConditionals.h>
#endif

namespace tools {
namespace device {
 
#if defined(ANDROID) || TARGET_OS_IPHONE
inline bool small_screen()     {return true;}
#elif defined(EMSCRIPTEN)
inline bool small_screen()     {return false;}
#else
inline bool small_screen()     {return false;}
#endif

inline unsigned int tex_mem_limit() {
  // glGet(GL_MAX_TEXTURE_SIZE) :
  //   MacBookPro : it returns 8192.
  //   SGS : it returns 2048.
  //   iPad1 : it returns 2048.
  //   iPod : it returns ?
  //   Nexus 10 : it returns ?

  // 1024*1024  //*3 =   3 145 728
  // 2048*2048  //*3 =  12 582 912
  // 4096*4096  //*3 =  50 331 648
  // 8192*8192  //*3 = 201 326 592
  // 8192*4096  //*3 = 100 663 296
  if(small_screen()) {
    //iOS : Apple says that max 2D tex size is 1024*1024 with two units
    //      texture available. From doc on PowerVR MBX.
    return 2048*2048*3;
  } else {
    //limit = 4096*4096*3; //=8192*2048 //permit to pass ATLAS big image.
    //permit to pass fete_science_2010/power2/image_0.jpg
    return 8192*4096*3; //100663296
  }
}

}}

#endif
