windows-xp/Source/XPSP1/NT/multimedia/directx/dxg/d3d8/util/d3dflt.cpp

//----------------------------------------------------------------------------
//
// d3dflt.cpp
//
// Supporting data and routines for general FP header.
//
// Copyright (C) Microsoft Corporation, 1997.
//
//----------------------------------------------------------------------------

#include "pch.cpp"
#pragma hdrstop

#ifdef _X86_

FLOAT g_fE =                    FLOAT_E;
FLOAT g_fZero =                 0.0f;
FLOAT g_fNearZero =             FLOAT_NEARZERO;
FLOAT g_fHalf =                 0.5f;
FLOAT g_fp95 =                  0.95f;
FLOAT g_fOne =                  1.0f;
FLOAT g_fOneMinusEps =          1.0f - FLT_EPSILON;
FLOAT g_fExpScale =             FLOAT_EXPSCALE;
FLOAT g_fOoExpScale =           (FLOAT)(1.0 / (double)FLOAT_EXPSCALE);
FLOAT g_f255oTwoPow15 =         (FLOAT)(255.0 / (double)CONST_TWOPOW15);
FLOAT g_fOo255 =                (FLOAT)(1.0 / 255.0);
FLOAT g_fOo256 =                (FLOAT)(1.0 / 256.0);
FLOAT g_fTwoPow7 =              FLOAT_TWOPOW7;
FLOAT g_fTwoPow8 =              FLOAT_TWOPOW8;
FLOAT g_fTwoPow11 =             FLOAT_TWOPOW11;
FLOAT g_fTwoPow15 =             FLOAT_TWOPOW15;
FLOAT g_fOoTwoPow15 =           (FLOAT)(1.0 / (double)CONST_TWOPOW15);
FLOAT g_fTwoPow16 =             FLOAT_TWOPOW16;
FLOAT g_fOoTwoPow16 =           (FLOAT)(1.0 / (double)CONST_TWOPOW16);
FLOAT g_fTwoPow20 =             FLOAT_TWOPOW20;
FLOAT g_fOoTwoPow20 =           (FLOAT)(1.0 / (double)CONST_TWOPOW20);
FLOAT g_fTwoPow27 =             FLOAT_TWOPOW27;
FLOAT g_fOoTwoPow27 =           (FLOAT)(1.0 / (double)CONST_TWOPOW27);
FLOAT g_fTwoPow30 =             FLOAT_TWOPOW30;
FLOAT g_fTwoPow31 =             FLOAT_TWOPOW31;
FLOAT g_fNearTwoPow31 =         FLOAT_NEARTWOPOW31;
FLOAT g_fOoTwoPow31 =           (FLOAT)(1.0 / (double)CONST_TWOPOW31);
FLOAT g_fOoNearTwoPow31 =       (FLOAT)(1.0 / (double)FLOAT_NEARTWOPOW31);
FLOAT g_fTwoPow32 =             FLOAT_TWOPOW32;
FLOAT g_fNearTwoPow32 =         FLOAT_NEARTWOPOW32;
FLOAT g_fTwoPow39 =             FLOAT_TWOPOW39;
FLOAT g_fTwoPow47 =             FLOAT_TWOPOW47;

#endif // _X86_

FLOAT g_fUInt8ToFloat[257] =
{
    0.0f,
    (FLOAT)(1.0 / 255.0),
    (FLOAT)(2.0 / 255.0),
    (FLOAT)(3.0 / 255.0),
    (FLOAT)(4.0 / 255.0),
    (FLOAT)(5.0 / 255.0),
    (FLOAT)(6.0 / 255.0),
    (FLOAT)(7.0 / 255.0),
    (FLOAT)(8.0 / 255.0),
    (FLOAT)(9.0 / 255.0),
    (FLOAT)(10.0 / 255.0),
    (FLOAT)(11.0 / 255.0),
    (FLOAT)(12.0 / 255.0),
    (FLOAT)(13.0 / 255.0),
    (FLOAT)(14.0 / 255.0),
    (FLOAT)(15.0 / 255.0),
    (FLOAT)(16.0 / 255.0),
    (FLOAT)(17.0 / 255.0),
    (FLOAT)(18.0 / 255.0),
    (FLOAT)(19.0 / 255.0),
    (FLOAT)(20.0 / 255.0),
    (FLOAT)(21.0 / 255.0),
    (FLOAT)(22.0 / 255.0),
    (FLOAT)(23.0 / 255.0),
    (FLOAT)(24.0 / 255.0),
    (FLOAT)(25.0 / 255.0),
    (FLOAT)(26.0 / 255.0),
    (FLOAT)(27.0 / 255.0),
    (FLOAT)(28.0 / 255.0),
    (FLOAT)(29.0 / 255.0),
    (FLOAT)(30.0 / 255.0),
    (FLOAT)(31.0 / 255.0),
    (FLOAT)(32.0 / 255.0),
    (FLOAT)(33.0 / 255.0),
    (FLOAT)(34.0 / 255.0),
    (FLOAT)(35.0 / 255.0),
    (FLOAT)(36.0 / 255.0),
    (FLOAT)(37.0 / 255.0),
    (FLOAT)(38.0 / 255.0),
    (FLOAT)(39.0 / 255.0),
    (FLOAT)(40.0 / 255.0),
    (FLOAT)(41.0 / 255.0),
    (FLOAT)(42.0 / 255.0),
    (FLOAT)(43.0 / 255.0),
    (FLOAT)(44.0 / 255.0),
    (FLOAT)(45.0 / 255.0),
    (FLOAT)(46.0 / 255.0),
    (FLOAT)(47.0 / 255.0),
    (FLOAT)(48.0 / 255.0),
    (FLOAT)(49.0 / 255.0),
    (FLOAT)(50.0 / 255.0),
    (FLOAT)(51.0 / 255.0),
    (FLOAT)(52.0 / 255.0),
    (FLOAT)(53.0 / 255.0),
    (FLOAT)(54.0 / 255.0),
    (FLOAT)(55.0 / 255.0),
    (FLOAT)(56.0 / 255.0),
    (FLOAT)(57.0 / 255.0),
    (FLOAT)(58.0 / 255.0),
    (FLOAT)(59.0 / 255.0),
    (FLOAT)(60.0 / 255.0),
    (FLOAT)(61.0 / 255.0),
    (FLOAT)(62.0 / 255.0),
    (FLOAT)(63.0 / 255.0),
    (FLOAT)(64.0 / 255.0),
    (FLOAT)(65.0 / 255.0),
    (FLOAT)(66.0 / 255.0),
    (FLOAT)(67.0 / 255.0),
    (FLOAT)(68.0 / 255.0),
    (FLOAT)(69.0 / 255.0),
    (FLOAT)(70.0 / 255.0),
    (FLOAT)(71.0 / 255.0),
    (FLOAT)(72.0 / 255.0),
    (FLOAT)(73.0 / 255.0),
    (FLOAT)(74.0 / 255.0),
    (FLOAT)(75.0 / 255.0),
    (FLOAT)(76.0 / 255.0),
    (FLOAT)(77.0 / 255.0),
    (FLOAT)(78.0 / 255.0),
    (FLOAT)(79.0 / 255.0),
    (FLOAT)(80.0 / 255.0),
    (FLOAT)(81.0 / 255.0),
    (FLOAT)(82.0 / 255.0),
    (FLOAT)(83.0 / 255.0),
    (FLOAT)(84.0 / 255.0),
    (FLOAT)(85.0 / 255.0),
    (FLOAT)(86.0 / 255.0),
    (FLOAT)(87.0 / 255.0),
    (FLOAT)(88.0 / 255.0),
    (FLOAT)(89.0 / 255.0),
    (FLOAT)(90.0 / 255.0),
    (FLOAT)(91.0 / 255.0),
    (FLOAT)(92.0 / 255.0),
    (FLOAT)(93.0 / 255.0),
    (FLOAT)(94.0 / 255.0),
    (FLOAT)(95.0 / 255.0),
    (FLOAT)(96.0 / 255.0),
    (FLOAT)(97.0 / 255.0),
    (FLOAT)(98.0 / 255.0),
    (FLOAT)(99.0 / 255.0),
    (FLOAT)(100.0 / 255.0),
    (FLOAT)(101.0 / 255.0),
    (FLOAT)(102.0 / 255.0),
    (FLOAT)(103.0 / 255.0),
    (FLOAT)(104.0 / 255.0),
    (FLOAT)(105.0 / 255.0),
    (FLOAT)(106.0 / 255.0),
    (FLOAT)(107.0 / 255.0),
    (FLOAT)(108.0 / 255.0),
    (FLOAT)(109.0 / 255.0),
    (FLOAT)(110.0 / 255.0),
    (FLOAT)(111.0 / 255.0),
    (FLOAT)(112.0 / 255.0),
    (FLOAT)(113.0 / 255.0),
    (FLOAT)(114.0 / 255.0),
    (FLOAT)(115.0 / 255.0),
    (FLOAT)(116.0 / 255.0),
    (FLOAT)(117.0 / 255.0),
    (FLOAT)(118.0 / 255.0),
    (FLOAT)(119.0 / 255.0),
    (FLOAT)(120.0 / 255.0),
    (FLOAT)(121.0 / 255.0),
    (FLOAT)(122.0 / 255.0),
    (FLOAT)(123.0 / 255.0),
    (FLOAT)(124.0 / 255.0),
    (FLOAT)(125.0 / 255.0),
    (FLOAT)(126.0 / 255.0),
    (FLOAT)(127.0 / 255.0),
    (FLOAT)(128.0 / 255.0),
    (FLOAT)(129.0 / 255.0),
    (FLOAT)(130.0 / 255.0),
    (FLOAT)(131.0 / 255.0),
    (FLOAT)(132.0 / 255.0),
    (FLOAT)(133.0 / 255.0),
    (FLOAT)(134.0 / 255.0),
    (FLOAT)(135.0 / 255.0),
    (FLOAT)(136.0 / 255.0),
    (FLOAT)(137.0 / 255.0),
    (FLOAT)(138.0 / 255.0),
    (FLOAT)(139.0 / 255.0),
    (FLOAT)(140.0 / 255.0),
    (FLOAT)(141.0 / 255.0),
    (FLOAT)(142.0 / 255.0),
    (FLOAT)(143.0 / 255.0),
    (FLOAT)(144.0 / 255.0),
    (FLOAT)(145.0 / 255.0),
    (FLOAT)(146.0 / 255.0),
    (FLOAT)(147.0 / 255.0),
    (FLOAT)(148.0 / 255.0),
    (FLOAT)(149.0 / 255.0),
    (FLOAT)(150.0 / 255.0),
    (FLOAT)(151.0 / 255.0),
    (FLOAT)(152.0 / 255.0),
    (FLOAT)(153.0 / 255.0),
    (FLOAT)(154.0 / 255.0),
    (FLOAT)(155.0 / 255.0),
    (FLOAT)(156.0 / 255.0),
    (FLOAT)(157.0 / 255.0),
    (FLOAT)(158.0 / 255.0),
    (FLOAT)(159.0 / 255.0),
    (FLOAT)(160.0 / 255.0),
    (FLOAT)(161.0 / 255.0),
    (FLOAT)(162.0 / 255.0),
    (FLOAT)(163.0 / 255.0),
    (FLOAT)(164.0 / 255.0),
    (FLOAT)(165.0 / 255.0),
    (FLOAT)(166.0 / 255.0),
    (FLOAT)(167.0 / 255.0),
    (FLOAT)(168.0 / 255.0),
    (FLOAT)(169.0 / 255.0),
    (FLOAT)(170.0 / 255.0),
    (FLOAT)(171.0 / 255.0),
    (FLOAT)(172.0 / 255.0),
    (FLOAT)(173.0 / 255.0),
    (FLOAT)(174.0 / 255.0),
    (FLOAT)(175.0 / 255.0),
    (FLOAT)(176.0 / 255.0),
    (FLOAT)(177.0 / 255.0),
    (FLOAT)(178.0 / 255.0),
    (FLOAT)(179.0 / 255.0),
    (FLOAT)(180.0 / 255.0),
    (FLOAT)(181.0 / 255.0),
    (FLOAT)(182.0 / 255.0),
    (FLOAT)(183.0 / 255.0),
    (FLOAT)(184.0 / 255.0),
    (FLOAT)(185.0 / 255.0),
    (FLOAT)(186.0 / 255.0),
    (FLOAT)(187.0 / 255.0),
    (FLOAT)(188.0 / 255.0),
    (FLOAT)(189.0 / 255.0),
    (FLOAT)(190.0 / 255.0),
    (FLOAT)(191.0 / 255.0),
    (FLOAT)(192.0 / 255.0),
    (FLOAT)(193.0 / 255.0),
    (FLOAT)(194.0 / 255.0),
    (FLOAT)(195.0 / 255.0),
    (FLOAT)(196.0 / 255.0),
    (FLOAT)(197.0 / 255.0),
    (FLOAT)(198.0 / 255.0),
    (FLOAT)(199.0 / 255.0),
    (FLOAT)(200.0 / 255.0),
    (FLOAT)(201.0 / 255.0),
    (FLOAT)(202.0 / 255.0),
    (FLOAT)(203.0 / 255.0),
    (FLOAT)(204.0 / 255.0),
    (FLOAT)(205.0 / 255.0),
    (FLOAT)(206.0 / 255.0),
    (FLOAT)(207.0 / 255.0),
    (FLOAT)(208.0 / 255.0),
    (FLOAT)(209.0 / 255.0),
    (FLOAT)(210.0 / 255.0),
    (FLOAT)(211.0 / 255.0),
    (FLOAT)(212.0 / 255.0),
    (FLOAT)(213.0 / 255.0),
    (FLOAT)(214.0 / 255.0),
    (FLOAT)(215.0 / 255.0),
    (FLOAT)(216.0 / 255.0),
    (FLOAT)(217.0 / 255.0),
    (FLOAT)(218.0 / 255.0),
    (FLOAT)(219.0 / 255.0),
    (FLOAT)(220.0 / 255.0),
    (FLOAT)(221.0 / 255.0),
    (FLOAT)(222.0 / 255.0),
    (FLOAT)(223.0 / 255.0),
    (FLOAT)(224.0 / 255.0),
    (FLOAT)(225.0 / 255.0),
    (FLOAT)(226.0 / 255.0),
    (FLOAT)(227.0 / 255.0),
    (FLOAT)(228.0 / 255.0),
    (FLOAT)(229.0 / 255.0),
    (FLOAT)(230.0 / 255.0),
    (FLOAT)(231.0 / 255.0),
    (FLOAT)(232.0 / 255.0),
    (FLOAT)(233.0 / 255.0),
    (FLOAT)(234.0 / 255.0),
    (FLOAT)(235.0 / 255.0),
    (FLOAT)(236.0 / 255.0),
    (FLOAT)(237.0 / 255.0),
    (FLOAT)(238.0 / 255.0),
    (FLOAT)(239.0 / 255.0),
    (FLOAT)(240.0 / 255.0),
    (FLOAT)(241.0 / 255.0),
    (FLOAT)(242.0 / 255.0),
    (FLOAT)(243.0 / 255.0),
    (FLOAT)(244.0 / 255.0),
    (FLOAT)(245.0 / 255.0),
    (FLOAT)(246.0 / 255.0),
    (FLOAT)(247.0 / 255.0),
    (FLOAT)(248.0 / 255.0),
    (FLOAT)(249.0 / 255.0),
    (FLOAT)(250.0 / 255.0),
    (FLOAT)(251.0 / 255.0),
    (FLOAT)(252.0 / 255.0),
    (FLOAT)(253.0 / 255.0),
    (FLOAT)(254.0 / 255.0),
    1.0f,
    // Extra entry to allow for overflow.
    1.0f,
};

DOUBLE g_dSnap[33] =
{
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW52,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW51,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW50,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW49,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW48,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW47,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW46,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW45,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW44,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW43,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW42,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW41,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW40,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW39,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW38,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW37,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW36,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW35,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW34,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW33,
    (DOUBLE)CONST_TWOPOW32 + (DOUBLE)CONST_TWOPOW31,
    (DOUBLE)CONST_TWOPOW31 + (DOUBLE)CONST_TWOPOW30,
    (DOUBLE)CONST_TWOPOW30 + (DOUBLE)CONST_TWOPOW29,
    (DOUBLE)CONST_TWOPOW29 + (DOUBLE)CONST_TWOPOW28,
    (DOUBLE)CONST_TWOPOW28 + (DOUBLE)CONST_TWOPOW27,
    (DOUBLE)CONST_TWOPOW27 + (DOUBLE)CONST_TWOPOW26,
    (DOUBLE)CONST_TWOPOW26 + (DOUBLE)CONST_TWOPOW25,
    (DOUBLE)CONST_TWOPOW25 + (DOUBLE)CONST_TWOPOW24,
    (DOUBLE)CONST_TWOPOW24 + (DOUBLE)CONST_TWOPOW23,
    (DOUBLE)CONST_TWOPOW23 + (DOUBLE)CONST_TWOPOW22,
    (DOUBLE)CONST_TWOPOW22 + (DOUBLE)CONST_TWOPOW21,
    (DOUBLE)CONST_TWOPOW21 + (DOUBLE)CONST_TWOPOW20,
    (DOUBLE)CONST_TWOPOW20 + (DOUBLE)CONST_TWOPOW19,
};