#pragma once
#ifndef _MATH_BACKEND_H_
#define _MATH_BACKEND_H_

#ifndef _MCONSTANTS_H_
#include "math/mConstants.h"
#endif
#ifndef _PLATFORMASSERT_H_
#include "platform/platformAssert.h"
#endif
#ifndef _FLOAT4_DISPATCH_H_
#include "math/public/float4_dispatch.h"
#endif
#ifndef _FLOAT3_DISPATCH_H_
#include "math/public/float3_dispatch.h"
#endif
#ifndef _MAT44_DISPATCH_H_
#include "math/public/mat44_dispatch.h"
#endif

namespace math_backend
{
   enum class backend
   {
      scalar,
      sse2,
      sse41,
      avx,
      avx2,
      neon
   };

   static backend g_backend = backend::scalar;
   backend choose_backend(U32 cpu_flags);
   void install_from_cpu_flags(uint32_t cpu_flags);
}

#include <mutex>

namespace math_backend::float4::dispatch
{
   //--------------------------------------------------
   // Thread-safe getter, ensures scalar installed if empty
   //--------------------------------------------------
   inline Float4Funcs& GetFloat4()
   {
      if (gFloat4.mul == nullptr)
      {
         static std::once_flag once;
         std::call_once(once, []{
            install_scalar();
         });
      }
      return gFloat4;
   }
}

namespace math_backend::float3::dispatch
{
   //--------------------------------------------------
   // Thread-safe getter, ensures scalar installed if empty
   //--------------------------------------------------
   inline Float3Funcs& GetFloat3()
   {
      if (gFloat3.mul == nullptr)
      {
         static std::once_flag once;
         std::call_once(once, []{
            install_scalar();
         });
      }
      return gFloat3;
   }
}


namespace math_backend::mat44::dispatch
{
   //--------------------------------------------------
   // Thread-safe getter, ensures scalar installed if empty
   //--------------------------------------------------
   inline Mat44Funcs& GetMat44()
   {
      if (gMat44.mul_mat44 == nullptr)
      {
         static std::once_flag once;
         std::call_once(once, []{
            install_scalar();
         });
      }
      return gMat44;
   }
}

#endif // !_MATH_BACKEND_H_