/* vi: set ft=glsl */
uniform sampler2D texmap;
uniform sampler2D lightmap;

varying vec3 vdir, ldir[3], normal;

//#define KD gl_FrontMaterial.diffuse.rgb
#define KD vec3(1.0, 1.0, 1.0)

#define KS gl_FrontMaterial.specular.rgb
#define SPOW gl_FrontMaterial.shininess

#define LD(i) gl_LightSource[i].diffuse.rgb
#define LS(i) gl_LightSource[i].specular.rgb

vec3 calc_diffuse(in vec3 n, in vec3 l, in vec3 lcol)
{
	float ndotl = max(dot(n, l), 0.0);
	return KD * lcol * ndotl;
}

vec3 calc_specular(in vec3 n, in vec3 l, in vec3 v, in vec3 lcol)
{
	vec3 h = normalize(l + v);
	float ndoth = max(dot(n, h), 0.0);
	return KS * lcol * pow(ndoth, SPOW);
}

void main()
{
	vec3 texel = texture2D(texmap, gl_TexCoord[0].st).rgb;
	vec3 lumel = texture2D(lightmap, gl_TexCoord[1].st).rgb;

	vec3 n = normalize(normal);
	vec3 v = normalize(vdir);

	vec3 diffuse = lumel * texel * 1.8;
	vec3 specular = vec3(0.0, 0.0, 0.0);

	/*
	for(int i=0; i<3; i++) {
		vec3 l = normalize(ldir[i]);
		diffuse += calc_diffuse(n, l, LD(i)) * texel;
		specular += calc_specular(n, l, v, LS(i));
	}
	*/

	vec3 ambient = gl_LightModel.ambient.rgb * KD * texel;
	gl_FragColor.rgb = ambient + diffuse;// + specular;
	gl_FragColor.a = gl_FrontMaterial.diffuse.a;
}