#version 150

#moj_import <fog.glsl>

uniform sampler2D Sampler0;

uniform vec4 ColorModulator;
uniform float FogStart;
uniform float FogEnd;
uniform vec4 FogColor;
uniform vec4 Color;

in float vertexDistance;
in vec4 vertexColor;
in vec2 texCoord0;

out vec4 fragColor;

// Color --> vec4(r, g, b, alpha)

void main() {
    vec4 color = texture(Sampler0, texCoord0) * vertexColor * ColorModulator;
    if (color.a < 0.1) {
        discard;
    }

    // Static Colors
    vec3 RED = vec3(1.0, 0.0, 0.0); //RED
    vec3 GREEN = vec3(0.0, 1.0, 0.0); //GREEN
    vec3 BLUE = vec3(0.0, 0.0, 1.0); //BLUE

    // Filter Colors
    vec3 rawColor = Color.xyz;
    float opacity = Color.a;
    if (rawColor == RED) { // Filter RED
        fragColor = vec4(GREEN, opacity);

    } else { // Display Default
        fragColor = linear_fog(vertexColor, vertexDistance, FogStart, FogEnd, FogColor);
    }
}

//linear_fog(color, vertexDistance, FogStart, FogEnd, FogColor); - VANILLA