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varying vec4 diffuse,ambientGlobal,ambient;
varying vec3 normal,lightDir,halfVector;
varying float dist;
void main()
{
vec4 ecPos;
vec3 aux;
normal = normalize(gl_NormalMatrix * gl_Normal);
vec4 va = ftransform();
vec4 v = gl_Vertex;
v.y = v.y * (1.0 + sin(va.x * 6.0)*0.3);
gl_Position = gl_ModelViewProjectionMatrix * v;
ecPos = gl_ModelViewMatrix * v;
/* these are the new lines of code to compute the light's direction */
aux = vec3(gl_LightSource[0].position-ecPos);
lightDir = normalize(aux);
dist = length(aux);
halfVector = normalize(gl_LightSource[0].halfVector.xyz);
/* Compute the diffuse, ambient and globalAmbient terms */
diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
/* The ambient terms have been separated since one of them */
/* suffers attenuation */
ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
ambientGlobal = gl_LightModel.ambient * gl_FrontMaterial.ambient;
}
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