// Copyright 2006-2010 (C) - Frictional Games
//
// This file is part of HPL1 Engine
//
// For conditions of distribution and use, see copyright notice in LICENSE-shaders
//

///////////////////////////////////////////////////////
/// DIFFUSE SPECULAR LIGHTING FRAGMENT PROGRAM ////////
///////////////////////////////////////////////////////

in vec4 vLightColor;
in vec2 vUv;
in vec3 vLightDir;
in vec3 vHalfVec;

OUTPUT

uniform sampler2D tex0; //diffuseMap
uniform sampler1D tex3; //falloffMap

void main()
{
	float attenuation = texture1D(tex3, dot(vLightDir,vLightDir)).x;

	vec3 lightDir = normalize(vLightDir);
	vec3 halfVec = normalize(vHalfVec);

	float specular = clamp(dot(halfVec, vec3(0,0,1)), 0.0, 1.0);
	specular = pow(specular, 16.0) * vLightColor.w;

	outColor.xyz = specular + texture(tex0, vUv).xyz * vLightColor.xyz * dot(normalize(lightDir), vec3(0,0,1));
	outColor.xyz = outColor.xyz * attenuation;
}