#define DENSITY 16.0
#define OPACITY 0.6
#define GRASSCOLOR vec3(.325, 0.6, 0.1)
#define WALLCOLOR vec3(0.477, 0.316, 0.164)
#define ROADCOLOR vec3(.133, 0.125, 0.125)
#define YELLOW vec3(0.7,0.6,0.2)

float getnoise(vec2 uv, float density) {
    vec2 noiseUV = floor(uv.xy * density) / density;
	return fract(sin(dot(noiseUV, vec2(43928.2908985, 23234.393201))) * 3215.241466);
}

void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
    vec2 uv = fragCoord/iResolution.xy;

    vec3 diffuse = vec3(0.0);
    if (uv.x < 0.5) {
        if (uv.y < 0.5) {
        	diffuse = ROADCOLOR;
        }
        else {
           	diffuse = YELLOW;
        }
    }
    else {
        if (uv.y < 0.5) {
        	diffuse = GRASSCOLOR;
        }
        else {
           	diffuse = WALLCOLOR;
        }
    }

    float n = getnoise(uv, DENSITY);
	vec3 outcol = diffuse + diffuse * n * OPACITY;


    fragColor = vec4(outcol,1.0);
}