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void default_scatter(vec3 viewVec, vec3 lightDir);
uniform vec2 d1;
uniform vec2 d2;
uniform float time;
uniform vec3 eyeVec;
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 = modelViewProj * position;
vec3 oRefCoord = oPosition.xyz + vec3(0, 0, 0.2);
//get view vector
vec4 oEyeVec;
oEyeVec.xyz = position.xyz-eyeVec;
//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;
//get two normal map (detail map) texture coordinates
vec2 oTexCoord = gl_MultiTexCoord0.xy;
vec2 littleWave1 = (v.xy)*vec2(0.7, 1.5)+d2*time*0.065;
vec2 littleWave2 = (v.xy)*vec2(0.07, 0.15)-d1*time*0.087;
//pass wave parameters to pixel shader
float t = time * 0.075;
vec2 bigWave = (v.xy)*vec2(0.04,0.04)+d1*t;
//pass color and fog color to pixel shader
vec4 col = gl_Color;
col.a = clamp(abs(dot(normalize(oEyeVec.xyz), vec3(0,0,1))),0.0,1.0);
col.a = 1.0-col.a;
col.a += 0.75;
default_scatter((gl_ModelViewMatrix * gl_Vertex).xyz, gl_LightSource[0].position.xyz);
gl_Position = oPosition;
gl_TexCoord[0].xy = oTexCoord;
gl_TexCoord[0].zw = littleWave1;
gl_TexCoord[1].xy = littleWave2;
gl_TexCoord[1].zw = bigWave;
gl_TexCoord[2].xyz = oEyeVec.xyz;
gl_TexCoord[3].xyz = oRefCoord;
gl_FrontColor = col;
}
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