Applying shader to entire tilemap

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1

Godot Version

4.3

Question

I need to apply a shader to a single tilemaplayer, and none of the nodes below it. Additionally, the shader needs to affect the tilemap as a whole, not just the individual tiles. As well, the positioning of the shader needs to be relative to the tilemap, not the screen.

Adding this shader code:

shader_type canvas_item;

uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
uniform float frequency = 60;
uniform float depth = 0.005;

void fragment() {
	vec2 uv = SCREEN_UV;
	uv.x += sin(uv.y * frequency + TIME) * depth;
	uv.x = clamp(uv.x, 0.0, 1.0);
	vec3 c = textureLod(screen_texture, uv, 0.0).rgb;

	COLOR.rgb = c;
}

to a TextureRect almost gets me there, but it also applies to everything behind the tilemaplayer, which isn’t what I want. The waves are also fixed to the screen, so it changes when the camera moves. And I tried a modified version:

shader_type canvas_item;

uniform float frequency = 60;
uniform float depth = 0.005;

void fragment() {
	vec2 uv = UV;
	uv.x += sin(uv.y * frequency + TIME) * depth;
	uv.x = clamp(uv.x, 0.0, 1.0);
	vec4 c = textureLod(TEXTURE, uv, 0.0);

	COLOR = c;
}

as a shader on the tilemap itself, but this applies the shader seperately to each tile, so the distort isn’t consistent across them.

How can I do this properly??? Applying a shader to a tilemap seems like it should be basic functionality, it baffles me that I’m struggling so hard with this.

2

My intuition would be to keep applying the shader on individual tiles, but offset the entire effect based on screen UV

4

This would have the effect’s position end up being relative to the screen though, right? then when my camera moves the effect would move with it, which isn’t what I want. Do you know if there’s a way to get the tile’s world position so I can shift the effect relative to that?

5

You can pass it as an instance uniform to the shader