// Copyright (c) 2023 Lachlan McDonald
// This work is licensed under the MIT License (MIT)
// https://github.com/lachlanmcdonald/magicavoxel-shaders
//
// xs outline [Color]
//
// xs_begin
// author : '@lmcdx.bsky.social'
// arg : { name = 'Color'  var = 'm_color'  range = '0 255'  value = '1'  step = '1'  precision = '0' }
// xs_end

bool isSelectedPal(float p) {
	for (int i = 0; i < i_num_color_sels; i += 1) {
		if (p == color_sel(float(i))) {
			return true;
		}
	}
	return false;
}

float map(vec3 v) {
	float index = voxel(v);

	if (isSelectedPal(index)) {
		for (float x = -1.0; x <= 1.0; x += 1.0) {
			for (float y = -1.0; y <= 1.0; y += 1.0) {
				for (float z = -1.0; z <= 1.0; z += 1.0) {
					vec3 p = v + vec3(x, y, z);

					if (p != v) {
						float n = voxel(p);

						if (isSelectedPal(n) == false && n != 0.0) {
							return m_color;
						}
					}
				}
			}
		}
	}

	return index;
}