new shader

// Fragment Shader
void main() {
    vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / u_resolution.y;
    vec3 col = vec3(
        RED *
        YELLOW *
        BLUE *
        GREEN *
        tan(uv.x * sin(u_time * 5.0) * tan(u_time) * 15.0) *
        cos(uv.y * tan(u_time * 5.0) * tan(u_time) * 15.0) *
        500.0);
    gl_FragColor = vec4(col, 1.0);
}