convert from rgb to srgb and the other way around in godot shaders

color_space_conversion.shader

float lts(float L) {
	if (abs(L) < 0.0031308) {
		return 12.92 * L;
	}
	return 1.055 * pow(L, (1.0 / 2.4)) - 0.055;
}

vec3 rgb_to_srgb(vec3 color) {
	return vec3(lts(color.r), lts(color.g), lts(color.b));
}

float stl(float S) {
	if (abs(S) < 0.04045) {
		return S / 12.92;
	}
	return pow((S + 0.055) / 1.055, 2.4);
}

vec3 srgb_to_rgb(vec3 color) {
	return vec3(stl(color.r), stl(color.g), stl(color.b));
}