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/**
* @file waterV.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* $/LicenseInfo$
*/
void calcAtmospherics(vec3 inPositionEye);
uniform vec2 d1;
uniform vec2 d2;
uniform float time;
uniform vec3 eyeVec;
uniform float waterHeight;
varying vec4 refCoord;
varying vec4 littleWave;
varying vec4 view;
float wave(vec2 v, float t, float f, vec2 d, float s)
{
return (dot(d, v)*f + t*s)*f;
}
void main()
{
//transform vertex
vec4 position = gl_Vertex;
mat4 modelViewProj = gl_ModelViewProjectionMatrix;
vec4 oPosition;
//get view vector
vec3 oEyeVec;
oEyeVec.xyz = position.xyz-eyeVec;
float d = length(oEyeVec.xy);
float ld = min(d, 2560.0);
position.xy = eyeVec.xy + oEyeVec.xy/d*ld;
view.xyz = oEyeVec;
d = clamp(ld/1536.0-0.5, 0.0, 1.0);
d *= d;
oPosition = position;
oPosition.z = mix(oPosition.z, max(eyeVec.z*0.75, 0.0), d);
oPosition = modelViewProj * oPosition;
refCoord.xyz = oPosition.xyz + vec3(0,0,0.2);
//get wave position parameter (create sweeping horizontal waves)
vec3 v = position.xyz;
v.x += (cos(v.x*0.08/*+time*0.01*/)+sin(v.y*0.02))*6.0;
//push position for further horizon effect.
position.xyz = oEyeVec.xyz*(waterHeight/oEyeVec.z);
position.w = 1.0;
position = position*gl_ModelViewMatrix;
calcAtmospherics((gl_ModelViewMatrix * gl_Vertex).xyz);
//pass wave parameters to pixel shader
vec2 bigWave = (v.xy) * vec2(0.04,0.04) + d1 * time * 0.055;
//get two normal map (detail map) texture coordinates
littleWave.xy = (v.xy) * vec2(0.45, 0.9) + d2 * time * 0.13;
littleWave.zw = (v.xy) * vec2(0.1, 0.2) + d1 * time * 0.1;
view.w = bigWave.y;
refCoord.w = bigWave.x;
gl_Position = oPosition;
}
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