/indra/newview/app_settings/shaders/class1/deferred/waterV.glsl

 1/** 
 2 * @file waterV.glsl
 3 *
 4 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 5 * Second Life Viewer Source Code
 6 * Copyright (C) 2007, Linden Research, Inc.
 7 * 
 8 * This library is free software; you can redistribute it and/or
 9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation;
11 * version 2.1 of the License only.
12 * 
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 * 
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
21 * 
22 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
23 * $/LicenseInfo$
24 */
25
26uniform mat4 modelview_matrix;
27uniform mat4 modelview_projection_matrix;
28
29ATTRIBUTE vec3 position;
30
31
32void calcAtmospherics(vec3 inPositionEye);
33
34uniform vec2 d1;
35uniform vec2 d2;
36uniform float time;
37uniform vec3 eyeVec;
38uniform float waterHeight;
39
40VARYING vec4 refCoord;
41VARYING vec4 littleWave;
42VARYING vec4 view;
43
44VARYING vec4 vary_position;
45
46float wave(vec2 v, float t, float f, vec2 d, float s) 
47{
48   return (dot(d, v)*f + t*s)*f;
49}
50
51void main()
52{
53	//transform vertex
54	vec4 pos = vec4(position.xyz, 1.0);
55	mat4 modelViewProj = modelview_projection_matrix;
56	
57	vec4 oPosition;
58		    
59	//get view vector
60	vec3 oEyeVec;
61	oEyeVec.xyz = pos.xyz-eyeVec;
62		
63	float d = length(oEyeVec.xy);
64	float ld = min(d, 2560.0);
65	
66	pos.xy = eyeVec.xy + oEyeVec.xy/d*ld;
67	view.xyz = oEyeVec;
68		
69	d = clamp(ld/1536.0-0.5, 0.0, 1.0);	
70	d *= d;
71		
72	oPosition = vec4(position, 1.0);
73	oPosition.z = mix(oPosition.z, max(eyeVec.z*0.75, 0.0), d);
74	vary_position = modelview_matrix * oPosition;
75	oPosition = modelViewProj * oPosition;
76	
77	refCoord.xyz = oPosition.xyz + vec3(0,0,0.2);
78	
79	//get wave position parameter (create sweeping horizontal waves)
80	vec3 v = pos.xyz;
81	v.x += (cos(v.x*0.08/*+time*0.01*/)+sin(v.y*0.02))*6.0;
82	    
83	//push position for further horizon effect.
84	pos.xyz = oEyeVec.xyz*(waterHeight/oEyeVec.z);
85	pos.w = 1.0;
86	pos = modelview_matrix*pos;
87	
88	calcAtmospherics(pos.xyz);
89		
90	//pass wave parameters to pixel shader
91	vec2 bigWave =  (v.xy) * vec2(0.04,0.04)  + d1 * time * 0.055;
92	//get two normal map (detail map) texture coordinates
93	littleWave.xy = (v.xy) * vec2(0.45, 0.9)   + d2 * time * 0.13;
94	littleWave.zw = (v.xy) * vec2(0.1, 0.2) + d1 * time * 0.1;
95	view.w = bigWave.y;
96	refCoord.w = bigWave.x;
97	
98	gl_Position = oPosition;
99}