// ---------------------------------------------------------------------------
//  Project:  NintendoWare
//  File:     GenTexcoordSphereReflection.vsh
//  
//  Copyright (C)2009-2011 Nintendo/HAL Laboratory, Inc.  All rights reserved.
//  
//  These coded instructions, statements, and computer programs contain proprietary
//  information of Nintendo and/or its licensed developers and are protected by
//  national and international copyright laws. 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.
//  
//  The content herein is highly confidential and should be handled accordingly.
//  
//  $Revision: $
// ---------------------------------------------------------------------------

#include "ShaderConfig.h"
#include "VertexShader.h"

//-----------------------------------------------------------------------------
// @brief        法線か、反射ベクトルの xy を利用してテクスチャ座標を TEMP_TEX に格納します。
//-----------------------------------------------------------------------------
l_gen_texcoord_sphere_reflection:
#ifdef NW_NORMAL_ENV_MAP
    mov     TEMP1.xy,           CONST_HALF
    mov     TEMP1.zw,           CONST_0
    mad     TEMP_TEX,           TEMP_NORM,      TEMP1, TEMP1
    mov     TEMP_TEX.zw,        CONST_0_0_1_1
#else
    call    l_gen_texcoord_reflection    
    mov     TEMP1,              TEMP_TEX
    add     TEMP1.z,            TEMP1.z,        CONST_1
    dp3     TEMP1,              TEMP1,          TEMP1
    rsq     TEMP2,              TEMP1.x
    mul     TEMP2,              TEMP2,          CONST_HALF
    mul     TEMP_TEX.xy,        TEMP_TEX.xy,    TEMP2
    add     TEMP_TEX.xy,        TEMP_TEX.xy,    CONST_HALF
#endif
    ret