GeneralsZeroHour/Generals/Code/GameEngineDevice/Source/W3DDevice/GameClient/Water/wave.nvv

;
;	Command & Conquer Generals(tm)
;	Copyright 2025 Electronic Arts Inc.
;
;	This program is free software: you can redistribute it and/or modify
;	it under the terms of the GNU General Public License as published by
;	the Free Software Foundation, either version 3 of the License, or
;	(at your option) any later version.
;
;	This program is distributed in the hope that it will be useful,
;	but WITHOUT ANY WARRANTY; without even the implied warranty of
;	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;	GNU General Public License for more details.
;
;	You should have received a copy of the GNU General Public License
;	along with this program.  If not, see <http://www.gnu.org/licenses/>.
;

;////////////////////////////////////////////////////////////////////////////////
;//																																					   //
;//  (c) 2001-2003 Electronic Arts Inc.																				 //
;//																																						 //
;////////////////////////////////////////////////////////////////////////////////

; Waves vertex shader
; Kenny Mitchell April 2001
; Modified July 2001 Mark Wilczynski

#define CV_ZERO 0
#define CV_ONE 1

#define CV_WORLDVIEWPROJ_0 2
#define CV_WORLDVIEWPROJ_1 3
#define CV_WORLDVIEWPROJ_2 4
#define CV_WORLDVIEWPROJ_3 5

#define CV_TEXPROJ_0 6
#define CV_TEXPROJ_1 7
#define CV_TEXPROJ_2 8
#define CV_TEXPROJ_3 9
#define CV_PATCH_SCALE_OFFSET 10

#define V_POSITION v0
#define V_DIFFUSE v1
#define V_TEXTURE v2
#define V_TEXTURE2 v3

vs.1.1

; Below is Kenny's new optimized version
; Transform position to clip space and output it
dp4 r0.x, V_POSITION, c[CV_WORLDVIEWPROJ_0]
dp4 r0.y, V_POSITION, c[CV_WORLDVIEWPROJ_1]
dp4 r0.z, V_POSITION, c[CV_WORLDVIEWPROJ_2]
dp4 r0.w, V_POSITION, c[CV_WORLDVIEWPROJ_3]

mov oPos, r0

; get 1/w and multiply it onto x and y
rcp r1.w, r0.w
mul r1.xy, r0.xy, r1.w

; scale/flip/offset tex coords to screen
mad oT1.xy, r1.xy, c[CV_TEXPROJ_0].xy,c[CV_TEXPROJ_0].zw

mov oT0, V_TEXTURE
mov oD0, V_DIFFUSE

#ifdef DO_WATER_ALPHA_TEXTURE
;generate uv coordinates for a third texture (alpha channel)
mad oT2.xy,v0.xz,c[CV_PATCH_SCALE_OFFSET].zw,c[CV_PATCH_SCALE_OFFSET].xy
#endif