uniform sampler2D color_texture;
uniform sampler2D normal_texture;

void main() {

// Extract the normal from the normal map
//vec3 normal = normalize(texture2D(normal_texture, gl_TexCoord[0].st).rgb + 1.0 / 2.0);
vec3 normal = normalize(texture2D(normal_texture, gl_TexCoord[0].st).rgb * 2.0 - 1.0);
//vec3 normal = normalize(texture2D(normal_texture, gl_TexCoord[0].st).rgb);

// Grab light position
vec4 lp4 = gl_LightSource[0].position;
vec3 light_pos = normalize(vec3(lp4.xyz));
//vec3 light_pos = normalize(vec3(1.0, 1.0, 1.5));

// Calculate the lighting diffuse value
float diffuse = max(dot(normal, light_pos), 0.0);

vec3 color = diffuse * texture2D(color_texture, gl_TexCoord[0].st).rgb;
//vec3 color = normal; /// texture2D(color_texture, gl_TexCoord[0].st).rgb;

// Set the output color of our current pixel
gl_FragColor = vec4(color, 1.0);
}