red + nois shader

shader

shader_type canvas_item;

float rng2(vec2 seed, float time)
{
	return fract(sin(dot(seed * floor(time* 12.0), vec2(127.1,311.7))) * 48654.5453123);
}

float rng(float seed, float time)
{
    return rng2(vec2(seed, 1.0), time);
}

void fragment() {
	vec2 uv = SCREEN_UV;
	vec2 blockS = floor(uv * vec2(24.0, 9.0));
	vec2 blockL = floor(uv * vec2(8.0, 4.0));
 
	float r = rng2(uv, TIME);
	vec3 noise = (vec3(r, 1.0 - r, r / 2.0 + 0.5)* 1.0) * 0.08;
	    
	float lineNoise = pow(rng2(blockS, TIME), 8.0) * pow(rng2(blockL, TIME), 3.0) - pow(rng(7.2341, TIME), 17.0) * 2.0;
	    
	vec4 col1 = texture(SCREEN_TEXTURE, uv);
	vec4 col2 = texture(SCREEN_TEXTURE, vec2(lineNoise * 0.05 * rng(5.0, TIME), 0.0));
	vec4 col3 = texture(SCREEN_TEXTURE, vec2(lineNoise * 0.05 * rng(31.0, TIME), 0.0));
	    
	COLOR.rgb = vec3(col1.x, col2.y, col3.z) + noise;
}