uniform float fTime0_X;
uniform float waveHeight;
uniform vec2 windDir;
uniform float roughness;

uniform vec4 vViewPosition;

varying mat3 tanSpace;

void main(void)
{
   float height = sin( 1.0 * (gl_Vertex.x + (windDir.x * fTime0_X)));
   height += 1.0;
   height = pow( max(0.0, height), roughness);
   
   float height2 = sin( 0.01 * (gl_Vertex.y + (windDir.y * fTime0_X)));
   height2 += 1.0;
   height2 = pow( max(0.0, height2), roughness);

   
   vec4 pos = gl_Vertex;
   pos.z = waveHeight * ((height + height2) / 2.0);
   
   gl_Position = gl_ModelViewProjectionMatrix * pos.xzyw;
   
   
   
   vec4 ref = normalize(reflect( (vViewPosition - pos.xzyw), vec4(0.0, 0.0, 1.0, 1.0)));
   ref += vec4(1.0,1.0,1.0,1.0);
   ref *= 0.5;
   
   gl_TexCoord[1] = ref;
   
   gl_TexCoord[0].xy = 4.0 * (gl_MultiTexCoord0.yx + vec2(0.0, fTime0_X * 0.01));
   
   //
   //   Find Surface Normal
   vec3 binormal = normalize(vec3( cos(1.0 * (gl_Vertex.x + (windDir.x * fTime0_X))),
                         1.0,
                         0.0));
                         
   vec3 tangent = normalize( 
                              vec3( 0.0,
                                    1.0,
                                     0.01 * cos(0.01 * (gl_Vertex.y + (windDir.y * fTime0_X))))
                         );
   vec3 normal = cross(binormal, tangent);
   normal += vec3(1.0,1.0,1.0);
   normal *= 0.5;
   
   tanSpace = mat3( vec3(1.0, 0.0, 0.0)
                     , normal,
                     vec3(0.0, 0.0, 1.0));
   
   
   
}