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#ifdef GL_ES
precision mediump float;
#endif

uniform sampler2D uDiffuse;
uniform sampler2D uNormalMap;
uniform float uAlpha;
uniform vec4 uColor;
uniform vec4 uFogColor;
uniform vec3 uLightDir;

varying vec4 vColor;
varying vec2 vTexCoord;

void main()
{
        vec4 normal = texture2D(uNormalMap, vTexCoord.xy);
        
        normal = (normal - 0.5) * 2.0;
        
        float lighting = dot(normalize(normal.xyz), normalize(-uLightDir));
        
        /*lighting = max(lighting*2-0.5, 0.0);*/

        vec4 result = texture2D(uDiffuse, vTexCoord.xy) * uColor * vColor;
        
        result.rgb = result.rgb * (1.0-uFogColor.a) + uFogColor.rgb * uFogColor.a;
        
        /* 0.5 ambient term */
        result.rgb = (result.rgb * 0.3) + (result.rgb * 0.7 * min(lighting*lighting*5, 1.0));
        
        result.w *= uAlpha;
        gl_FragColor = result;
}