#version 330

out vec4 outputColor;

uniform vec3 viewPos;
uniform sampler2D texture0;

in vec4 FarColor;
in vec3 FragPos;
in vec2 TexCoord;
in vec4 TexType;
in float RealType;

void main()
{
    float tileSize = 64.0 / 512.0;

    float baseWeight = 0.2;
    float dominantWeight = 0.4;

    vec4 weights = vec4(baseWeight);
    vec2 uvOffsets[4];
    for (int i = 0; i < 4; i++) {
        float type = TexType[i];
        uvOffsets[i] = vec2(mod(type, 8.0), floor(type / 8.0)) * tileSize;
        if (type == RealType) {
            weights[i] = dominantWeight;
        }
    }

    vec4 blendedColor[4];
    for (int i = 0; i < 4; i++) {
        vec2 uv = TexCoord * tileSize + uvOffsets[i];
        blendedColor[i] = texture(texture0, uv);
    }

    float weightX = TexCoord.x;
    float weightY = TexCoord.y;

    vec4 mix1 = mix(blendedColor[0], blendedColor[2], weightX);
    vec4 mix2 = mix(blendedColor[1], blendedColor[3], weightX);
    vec4 finalColor = mix(mix1, mix2, weightY);


    float distance = length(viewPos - FragPos);
    float interpolationFactor = clamp(distance / 1000.0, 0.0, 1.0);
    outputColor = mix(finalColor, FarColor, interpolationFactor);
}