Slipgate texture warp

This is a shader I made in an attempt to recreate the slipgates from Quake. There is also an option to warp the screen UVs if you want to make something that looks a bit more like a portal.

Shader code

shader_type spatial;
render_mode unshaded, depth_draw_always; // NO LIGHTING!, "depth_draw_always" to 'fix' Z-ordering

uniform bool warp_ScreenSpace = false;
uniform sampler2D texture_albedo : source_color, filter_nearest;

void fragment() {
	vec2 uv = vec2(0.0);
	
	if(warp_ScreenSpace){
		uv = SCREEN_UV;
	}else{
		uv = UV;
	}
		
	// TODO: ADD NOISE SAMPLER INSTEAD OF USING TRIG?
	
	// TWEAK THE COEFFS AND/OR EQUATION FOR A DIFFERENT WARP PATTERN
	uv.x += sin(uv.y * 1.54 * PI + TIME) * cos(uv.y * 1.31 * PI + TIME) * 0.1; 
	uv.y += cos(uv.x * 1.74 * PI + TIME) * -sin(uv.y * 1.64 * PI + TIME) * 0.1; 

	vec4 color = texture(texture_albedo, uv * 2.0);

	ALBEDO = color.xyz;
	ALPHA = color.a;
}

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