init

scripts/shaders/pixelation.gdshader

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+shader_type canvas_item;
+uniform int num_colors: hint_range(2,32) = 8;
+uniform sampler2D PALETTE_TEXTURE: hint_default_black;
+uniform sampler2D PALETTE_TEXTURE_LOW: hint_default_black;
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
+
+uniform int u_dither_size = 4;
+
+vec3 palette_limiter (in vec3 albedo, in vec2 uv){
+	float estimation_cutoff = 0.001;
+	vec3 closest_color;
+	float min_dist = 2.0;
+	float n = float(num_colors);
+	
+	bool palette_low = (int(uv.y)) % 2 == 0;
+	
+	for (int i=0; i<num_colors; i++ ){
+		float index = 1.000/(2.000*n)+float(i)/n;
+		vec3 index_color = texture(PALETTE_TEXTURE, vec2(index,0.5)).rgb;
+		float dist = length(index_color - albedo);
+		if (dist < min_dist) {
+			min_dist = dist;
+			if(palette_low){
+				closest_color = texture(PALETTE_TEXTURE_LOW, vec2(index,0.5)).rgb;
+			}else{
+				closest_color = index_color;
+			}
+			if (min_dist < estimation_cutoff){
+				return closest_color;
+			}
+		}
+	}
+
+	return closest_color;
+}
+
+void fragment() {
+	vec2 screen_size = vec2(textureSize(SCREEN_TEXTURE, 0)) / float(u_dither_size);
+	vec2 uv_cord = floor(UV * screen_size);
+	vec2 screen_sample_uv = uv_cord / screen_size;
+	vec3 current_color = texture(SCREEN_TEXTURE, screen_sample_uv).rgb;
+	
+	COLOR.rgb = palette_limiter(current_color, uv_cord);
+}