/*---------------------------------------------------------------------------*
  Project:  NintendoWare
  File:     gfx_ParticleRandom.cpp

  Copyright (C)2009-2010 Nintendo Co., Ltd./HAL Laboratory, Inc.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Revision: 23207 $
 *---------------------------------------------------------------------------*/

#include "precompiled.h"

#include <nw/gfx/gfx_ParticleRandom.h>

namespace nw
{
namespace gfx
{

#include <nn/hw/ARM/code32.h>
#include <nn/hw/ARM/VFPv2_reg.h>

//----------------------------------------
asm f32
ParticleRandom::NextFloatSignedOne()
{
    LDR      r2, [r0, #__cpp(offsetof(ParticleRandom, m_Seed))]

    LDR      r3, mix1
    LDR      r1, mix2
    MLA      r1, r2, r3, r1

      LDR      r3, mask
    STR      r1, [r0, #0]
      AND      r2,r3,r1,LSR #16

        CLZ      r0, r2
      AND      r12, r1, #0x80000000
        LSL      r2, r2, r0 // 最上位が1になるまで左に出して
          RSB      r1, r0, #142 // 最上位(17)のときに126 (-1 + 127)になる
        ADD      r2, r12, r2, LSR #8
          ADD      r2, r2, r1, LSL #23 /// 指数部を設定
          VMOV     s0, r2

    BX       lr

mix1 DCD      0x343fd
mix2 DCD      0x269ec3
mask DCD      0x00007fff
}

//----------------------------------------
asm f32
ParticleRandom::NextFloatSignedHalf()
{
    LDR      r2, [r0, #__cpp(offsetof(ParticleRandom, m_Seed))]

    LDR      r3, mixh1
    LDR      r1, mixh2
    MLA      r1, r2, r3, r1

      LDR      r3, maskh
    STR      r1, [r0, #0]
      AND      r2,r3,r1,LSR #16

        CLZ      r0, r2
      AND      r12, r1, #0x80000000
        LSL      r2, r2, r0 // 最上位が1になるまで左に出して
          RSB      r1, r0, #141 // 最上位(17)のときに126 (-1 + 127)になる
        ADD      r2, r12, r2, LSR #8
          ADD      r2, r2, r1, LSL #23 /// 指数部を設定
          VMOV     s0, r2

    BX       lr

mixh1 DCD      0x343fd
mixh2 DCD      0x269ec3
maskh DCD      0x00007fff
}

#include <nn/hw/ARM/codereset.h>

} // namespace gfx
} // namespace nw