int __cdecl sub_877EB0(int a1)
{
  int result; // eax@1
  int v2; // esi@1
  unsigned int v3; // edx@3
  int v4; // ecx@3
  int v5; // ecx@3
  int v6; // edi@3
  double v7; // st7@3
  int v8; // edx@3
  signed __int64 v9; // st7@3
  int v10; // eax@3
  int v11; // ecx@3
  signed __int64 v12; // st7@3
  int v13; // eax@3
  int v14; // ebp@3
  __int64 v15; // qax@5
  int v16; // ST04_4@5
  int v17; // eax@5
  signed __int64 v18; // [sp+4h] [bp-Ch]@3
  int v19; // [sp+Ch] [bp-4h]@5

  result = a1;
  v2 = *(_DWORD *)(a1 + 16);
  if ( v2 )
  {
    if ( *(_DWORD *)(a1 + 28) == 2 )
    {
      v5 = *(_DWORD *)(a1 + 24);
      v8 = *(_DWORD *)(v5 + 12);
      LODWORD(v18) = *(_DWORD *)(v5 + 8);
      HIDWORD(v18) = v8;
      v9 = v18;
      LODWORD(v18) = (unsigned __int16)a1 | 0xC00;
      v10 = *(_DWORD *)(v5 + 24);
      v11 = *(_DWORD *)(v5 + 28);
      v3 = (signed __int64)*(double *)&v9;
      LODWORD(v18) = v10;
      HIDWORD(v18) = v11;
      v12 = v18;
      LODWORD(v18) = (unsigned __int16)a1 | 0xC00;
      v13 = *(_DWORD *)(*(_DWORD *)(v2 + 12 * (*(_DWORD *)(v2 + 244) + 16)) + 20 * *(_DWORD *)(v2 + 228) + 4);
      v18 = (signed __int64)*(double *)&v12;
      v4 = (signed __int64)*(double *)&v12;
      v14 = 308 * (signed __int64)*(double *)&v12;
      v7 = *(float *)(v14 + 300 + v13);
      v6 = *(_DWORD *)(v14 + 288 + v13);
      if ( (double)v3 != v7 )
      {
        sub_875EF0(v2, v3, v4);
        if ( v6 == 6 )
        {
          v18 = 0i64;
          v19 = 0;
          v15 = sub_731690(SLODWORD(dword_1AD5F94), 6, 0);
          v16 = v15;
          v17 = (*(int (__fastcall **)(_DWORD, _DWORD))((char *)&dword_F3748F + 1))(
                  LODWORD(dword_1AD5F94),
                  HIDWORD(v15));
          sub_5619D0(v17, v7, (int)&v18, v16, 1, 0);
          sub_5A7B00(LODWORD(dword_1AD5F94), &v18);
        }
        sub_876F00();
      }
      result = *(_DWORD *)(v2 + 12 * (*(_DWORD *)(v2 + 244) + 16));
      *(_BYTE *)(result + 20 * *(_DWORD *)(v2 + 228) + 17) = 1;
    }
  }
  return result;
}