Replace Color

A simple replace color shader.

Based on: Green color replacement shader.

Shader code

shader_type canvas_item;

uniform float tolerance: hint_range(0.0, 1.0, 0.01) = 0.1;
uniform vec4 prev_color: source_color = vec4(1.0);
uniform vec4 new_color: source_color = vec4(0.0, 0.0, 0.0, 1.0);

void fragment() {
    vec4 color = texture(TEXTURE, UV);
    vec4 initial_color = color;

	float color_distance = distance(prev_color, color);

    if (color_distance <= tolerance) {
		color = mix(new_color, color, color_distance);
		color.a = initial_color.a;
    }

    COLOR = color;
}

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