//-----------------------------------------------------------------------------
// Copyright (c) 2012 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#include "platform/platform.h"
#include "console/console.h"
#include "math/mMath.h"
#include "core/strings/stringFunctions.h"


extern void mInstallLibrary_C();
extern void mInstallLibrary_ASM();


extern void mInstall_AMD_Math();
extern void mInstall_Library_SSE();


//--------------------------------------
ConsoleFunction( MathInit, void, 1, 10, "(detect|C|FPU|MMX|3DNOW|SSE|...)")
{
   U32 properties = CPU_PROP_C;  // C entensions are always used

   if (argc == 1)
   {
         Math::init(0);
         return;
   }
   for (argc--, argv++; argc; argc--, argv++)
   {
      if (dStricmp(*argv, "DETECT") == 0) {
         Math::init(0);
         return;
      }
      if (dStricmp(*argv, "C") == 0) {
         properties |= CPU_PROP_C;
         continue;
      }
      if (dStricmp(*argv, "FPU") == 0) {
         properties |= CPU_PROP_FPU;
         continue;
      }
      if (dStricmp(*argv, "MMX") == 0) {
         properties |= CPU_PROP_MMX;
         continue;
      }
      if (dStricmp(*argv, "3DNOW") == 0) {
         properties |= CPU_PROP_3DNOW;
         continue;
      }
      if (dStricmp(*argv, "SSE") == 0) {
         properties |= CPU_PROP_SSE;
         continue;
      }
      Con::printf("Error: MathInit(): ignoring unknown math extension '%s'", (const char*)argv[0]);
   }
   Math::init(properties);
}



//------------------------------------------------------------------------------
void Math::init(U32 properties)
{
   if (!properties)
      // detect what's available
      properties = Platform::SystemInfo.processor.properties;
   else
      // Make sure we're not asking for anything that's not supported
      properties &= Platform::SystemInfo.processor.properties;

   Con::printf("Math Init:");
   Con::printf("   Installing Standard C extensions");
   mInstallLibrary_C();

   Con::printf("   Installing Assembly extensions");
   mInstallLibrary_ASM();

   if (properties & CPU_PROP_FPU)
   {
      Con::printf("   Installing FPU extensions");
   }

   if (properties & CPU_PROP_MMX)
   {
      Con::printf("   Installing MMX extensions");
      if (properties & CPU_PROP_3DNOW)
      {
         Con::printf("   Installing 3DNow extensions");
         mInstall_AMD_Math();
      }
   }

#if !defined(__MWERKS__) || (__MWERKS__ >= 0x2400)
   if (properties & CPU_PROP_SSE)
   {
      Con::printf("   Installing SSE extensions");
      mInstall_Library_SSE();
   }
#endif //mwerks>2.4

   Con::printf(" ");
}


//------------------------------------------------------------------------------

static MRandomLCG sgPlatRandom;

F32 Platform::getRandom()
{
   return sgPlatRandom.randF();
}


#if defined(TORQUE_CPU_X86) || defined(__x86_64__)

U32 Platform::getMathControlState()
{
   U16 cw;
   asm("fstcw %0" : "=m" (cw) :);
   return cw;
}

void Platform::setMathControlState(U32 state)
{
   U16 cw = state;
   asm("fldcw %0" : : "m" (cw));
}

void Platform::setMathControlStateKnown()
{
   U16 cw = 0x27F;
   asm("fldcw %0" : : "m" (cw));
}

#else

U32 Platform::getMathControlState()
{
   return 0;
}

void Platform::setMathControlState(U32 state)
{
}

void Platform::setMathControlStateKnown()
{
}

#endif

