varying float i;
varying vec3 n, l;

uniform vec3 m;

#vertex

void main() {
    n = normalize(gl_NormalMatrix * gl_Normal);
    l = normalize(vec3(gl_LightSource[0].position));

    gl_TexCoord[0] = gl_Vertex * 10.0;
    gl_TexCoord[1] = (gl_Vertex + vec4(1.0, 1.0, 1.0, 1.0)) * 0.5;
    i = max(m.s + m.t * gl_Vertex.z, 0.0);
    i = 0.1 + i * 0.9;
    gl_Position = ftransform();
}

#fragment

uniform sampler2D tex;
uniform sampler2D shad;

void main() {
    vec3 t = (vec3(texture2D(tex, vec2(gl_TexCoord[0]))) - vec3(0.5, 0.5, 0.5)) + normalize(n);
    float l = 0.75 + 0.25 * dot(normalize(t), l);
    l = i * l + (1.0 - i) * i;
    l *= (1.0 - m.z * texture2D(shad, vec2(gl_TexCoord[1])).r);
    gl_FragColor = vec4(l,l,l,l);
}