shader_type canvas_item;

// Parameters
uniform float alpha_threshold : hint_range(0.0, 1.0) = 0.1; // below this = fully transparent
uniform float alpha_modifier  : hint_range(0.0, 1.0) = 1.0; // global alpha multiplier

void fragment() {
    // Sample the texture
    vec4 tex_color = texture(TEXTURE, UV);

    // Use the texture's alpha channel directly
    float alpha = tex_color.a < alpha_threshold ? 0.0 : tex_color.a;

    // Apply global modifier
    alpha *= alpha_modifier;

    // Preserve original RGB, apply computed alpha
    COLOR = vec4(tex_color.rgb, alpha);
}