uniform sampler2D base_texture;
uniform sampler2D height_texture;
varying vec2 coord;
varying vec3 normal;

void main()
{
	vec4 baseCol = texture2D(base_texture, coord * 128) * vec4(1.0, 1.0, 1.0, 1.0);
	float NdotL0 = max(dot(normalize(normal), gl_LightSource[0].position.xyz), 0.0);

	vec4 ambient = vec4(0.0, 0.0, 0.0, 1.0);
	ambient.rgb += gl_LightSource[0].ambient.rgb;
	ambient *= gl_FrontMaterial.ambient * baseCol;

	vec4 diffuse = vec4(0.0, 0.0, 0.0, 1.0);
	diffuse.rgb += NdotL0 * gl_LightSource[0].diffuse.rgb;
	diffuse *= gl_FrontMaterial.diffuse * baseCol;

	vec4 specular = vec4(0.0, 0.0, 0.0, 1.0);
	specular += clamp(dot(reflect(vec3(0, 0, 1), normal), normalize(gl_LightSource[0].position.xyz)), 0.0, 1.0);
	specular *= gl_FrontMaterial.specular * baseCol;

	gl_FragColor = clamp(ambient + diffuse + specular, 0.0, 1.0);
}