Un shader plus complet

varying vec3 v;
varying vec2 t0;

void main()
{
 gl_Position = ftransform();
 v = vec3(gl_ModelViewMatrix * gl_Vertex);
 t0 = gl_MultiTexCoord0.xy;
}

varying vec3 v;
varying vec2 t0;

uniform sampler2D textureMap;
uniform sampler2D normalMap;

void main()
{
 vec3 lightVec = normalize(gl_LightSource[0].position.xyz - v); 
 
 vec3 normal = 
  gl_NormalMatrix * 
  (vec3(-1, 1, -1) * 
  normalize(texture2D(normalMap, t0).rgb * 2 - 1));

 vec4 base = texture2D(textureMap, t0);

 vec4 ambiantTerm = 
  gl_LightSource[0].ambient * 
  gl_FrontMaterial.ambient;

 float diffuse = max(dot(normal, lightVec), 0.0);
 vec4 diffuseTerm = 
  diffuse *
  gl_LightSource[0].diffuse * 
  gl_FrontMaterial.diffuse;

 float specular = pow(max(dot(reflect(lightVec, normal * 0.8), v), 0.0), 
  gl_FrontMaterial.shininess);
 vec4 specularTerm = 
  specular * 
  gl_FrontMaterial.specular * 
  gl_LightSource[0].specular;

 gl_FragColor = 
  ambiantTerm * base + 
  diffuseTerm * base + 
  specularTerm;
}