layout(location = 0) in vec3 in_pos;
layout(location = 1) in vec3 in_normal;
layout(location = 2) in vec4 in_color;
layout(location = 3) in vec2 in_tex0;

out vec4 v_color;
out vec2 v_tex0;
out float v_fog;

void
main(void)
{
	vec4 V = u_world * vec4(in_pos, 1.0);
	gl_Position = u_proj * u_view * V;
	vec3 N = mat3(u_world) * in_normal;

	v_tex0 = in_tex0;

	v_color = in_color;
	v_color.rgb += u_ambLight.rgb*surfAmbient;

#ifdef DIRECTIONALS
	for(int i = 0; i < MAX_LIGHTS; i++){
		if(u_directLights[i].enabled == 0.0)
			break;
		v_color.rgb += DoDirLight(u_directLights[i], N)*surfDiffuse;
	}
#endif
#ifdef POINTLIGHTS
	for(int i = 0; i < MAX_LIGHTS; i++){
		if(u_pointLights[i].enabled == 0.0)
			break;
		v_color.rgb += DoPointLight(u_pointLights[i], V.xyz, N)*surfDiffuse;
	}
#endif
#ifdef SPOTLIGHTS
	for(int i = 0; i < MAX_LIGHTS; i++){
		if(u_spotLights[i].enabled == 0.0)
			break;
		v_color.rgb += DoSpotLight(u_spotLights[i], V.xyz, N)*surfDiffuse;
	}
#endif

	v_color = clamp(v_color, 0.0f, 1.0);
	v_color *= u_matColor;

	v_fog = DoFog(gl_Position.w);
}