shader_type canvas_item;

uniform float rows = 44.0;  // Really int but don't want to recast all the time
uniform float cols = 63.0;  // ^

void fragment(){
	vec2 frag_pos = UV * vec2(cols, rows);
	vec2 frag_marginal = fract(frag_pos+0.05);
	vec2 frag_marginal_2 = fract(frag_pos-0.4);
	vec2 grid_data = texture(TEXTURE, (frag_pos+0.05)/vec2(cols+1.0, rows+1.0)).rg;
	COLOR = vec4(0.0);
	if (frag_marginal.x < 0.1){
		if (grid_data.g >= 0.99){
			if (frag_marginal_2.y <= 0.2)
				COLOR = vec4(1.0, 0.0, 0.0, 1.0);
		}else if (grid_data.g >= 0.49){
			COLOR = vec4(0.0, 0.0, 1.0, 1.0);
		}else
			COLOR = vec4(0.5, 0.5, 0.5, 1.0);
	}
	if  (frag_marginal.y < 0.1){
		if (grid_data.r >= 0.99){
			if (frag_marginal_2.x <= 0.2)
				COLOR = vec4(1.0, 0.0, 0.0, 1.0);
		}else if (grid_data.r >= 0.49){
			COLOR = vec4(0.0, 0.0, 1.0, 1.0);
		}else
			COLOR = vec4(0.5, 0.5, 0.5, 1.0);
	}
}