#import bevy_sprite::mesh2d_view_bindings
struct RainbowOutlineMaterial {
    thickness : f32,
    frequency : f32,
};
@group(1) @binding(0)
var<uniform> material: RainbowOutlineMaterial;
@group(1) @binding(1)
var base_color_texture: texture_2d<f32>;
@group(1) @binding(2)
var base_color_sampler: sampler;

@fragment
fn fragment(
    #import bevy_pbr::mesh_vertex_output
    @builtin(position) coord : vec4<f32>
) -> @location(0) vec4<f32> {    
    var outline : f32 = textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(material.thickness,0.0)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(-material.thickness,0.0)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(0.0,material.thickness)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(0.0,-material.thickness)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(material.thickness,-material.thickness)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(-material.thickness,material.thickness)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(material.thickness,material.thickness)).a;
    outline += textureSample(base_color_texture, base_color_sampler,uv + vec2<f32>(-material.thickness,-material.thickness)).a;
    outline = min(outline, 1.0);
    var animated_line_color : vec4<f32> = vec4(sin(globals.time * material.frequency),
							   sin(globals.time * material.frequency + radians(120.0)),
							   sin(globals.time * material.frequency + radians(240.0)),
							   1.0);
    var color : vec4<f32> = textureSample(base_color_texture, base_color_sampler,uv);
    return mix(color, animated_line_color, outline - color.a) - color;
}