Palette shader (lospec compatible)

This palette shader uses 1x palette textures to do it’s work. It does so by sampling from the 1x textures you can find on websites like lospec.

To make this shader work, use a Sprite (or other CanvasItem with pixels) or cover the area you want to change the colors of with a ColorRect. Then use this shader, set up the amount of colors in the palette texture and drag in the palette texture itself.

Why not try the world famous PICO-8 palette for your next jam game! Confuse everyone haha.

Shader code

shader_type canvas_item;

uniform sampler2D palette : hint_black; // Insert a palette from lospec for instance
uniform int palette_size = 16;

void fragment(){ 
	vec4 color = texture(SCREEN_TEXTURE, SCREEN_UV);
	vec4 new_color = vec4(.0);
	
	for (int i = 0; i < palette_size; i++) {
		vec4 palette_color = texture(palette, vec2(1.0 / float(palette_size) * float(i), .0));
		if (distance(palette_color, color) < distance(new_color, color)) {
			new_color = palette_color;
		}
	}
	
	COLOR = new_color;
}

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