uniform sampler2D tex_layout;
uniform sampler2D tex_detail0;
uniform sampler2D tex_detail1;
uniform sampler2D tex_detail2;
uniform sampler2D tex_detail3;

#if __VERSION__ >= 130
in vec2 uv;
in vec2 uv_bis;
out vec4 FragColor;
#else
varying vec2 uv;
varying vec2 uv_bis;
#define FragColor gl_FragColor
#endif

vec3 getLightFactor(float specMapValue);

void main() {
    // Splatting part
    vec4 splatting = texture(tex_layout, uv_bis);
    vec4 detail0 = texture(tex_detail0, uv);
    vec4 detail1 = texture(tex_detail1, uv);
    vec4 detail2 = texture(tex_detail2, uv);
    vec4 detail3 = texture(tex_detail3, uv);
    vec4 detail4 = vec4(0.0);

    vec4 splatted = splatting.r * detail0 +
        splatting.g * detail1 +
        splatting.b * detail2 +
        max(0., (1.0 - splatting.r - splatting.g - splatting.b)) * detail3;

    vec3 LightFactor = getLightFactor(1.);
    FragColor = vec4(splatted.xyz * LightFactor, 1.);
}