copy of normalmapcreate.nvp

游戏编程精华02－含有几十个游戏编程例子

/*********************************************************************NVMH2****
Path:  C:\Dev\devrel\Nv_sdk_4\Dx8\NVEffectsBrowser\Effects\CA_Water
File:  NormalMapCreate.nvp

Copyright (C) 1999, 2000 NVIDIA Corporation
This file is provided without support, instruction, or implied warranty of any
kind.  NVIDIA makes no guarantee of its fitness for a particular purpose and is
not liable under any circumstances for any damages or loss whatsoever arising
from the use or inability to use this file or items derived from it.

Comments:

Neighbor-differencing part of normal map creation.  This doesn't apply 
  any sort of normalization to the output color

******************************************************************************/




#include "PixelConstants.h"


; Declare pixel shader version
ps.1.1





def c7, 0.5, 0.5, 0.5, 1.0

// red for s axis
def c5, 1.0, 0.0, 0.0, 1.0

// green for t axis
def c6, 0.0, 1.0, 0.0, 1.0

// blue
def c4, 0.0, 0.0, 1.0, 1.0

def c3, 0.0, 1.0, 1.0, 0.0

def c2, 0.5, 0.5, 0.0, 0.0
def c1, 1.0, 1.0, 0.0, 0.0


; get colors from all 4 texture stages
; t0 = -s,  0
; t1 = +s,  0
; t2 =  0, +t
; t3 =  0, -t



tex t0
tex t1
tex t2
tex t3


sub_x4 r0, t0, t1       // t0 - t1
mul t0, r0, c5			// t0 = s result

sub_x4 r1, t3, t2       // r1 = t result

mad r0, r1, c6, t0      // r0 = rg for s and t result

mul t1, r0, r0          // t1 = square s and t difference

dp3_d2 r1, 1-t1, c1     // r1 = (1 - s^2 + 1 - t^2 )/2

//add_d2 r1, 1-t0, 1-r1

add r0, r0, c2


mad r0, r1, c4, r0      // rg + blue