# version 450

layout(location = 0) in vec4 in_border_color;
layout(location = 1) in vec4 in_background_color;
layout(location = 2) in vec2 in_px_scale;
layout(location = 3) in vec3 in_uv;

layout(location = 0) out vec4 out_color;

bool is_in_border() {
	return in_uv.x <= in_px_scale.x
		|| in_uv.x >= 1.0-in_px_scale.x
		|| in_uv.y <= in_px_scale.y
		|| in_uv.y >= 1.0-in_px_scale.y;
}

void main() {
	if (is_in_border()) {
		out_color = in_border_color;
	} else {
		out_color = in_background_color;
	}
}