#pragma once

#include <vector>
#include <ostream>

#include <glm/vec3.hpp>
#include <glm/vec4.hpp>

void calculateNormals(const std::vector<glm::vec3> &vtx,
		std::vector<glm::uvec3> &tri, std::vector<glm::vec3> &normals);

void moveToMean(std::vector<glm::vec3> &vtx);

void smooth(std::vector<glm::vec3> &vtx, const std::vector<glm::uvec3> &tri);

void saveAttrib(std::ostream &out, const char *prefix,
		std::vector<glm::vec3> &elements);

void saveAttrib(std::ostream &out, const char *prefix,
		std::vector<glm::vec2> &elements);

void saveFaces(std::ostream &out, const std::vector<glm::uvec3> &tris,
		size_t attribs);

void calculateEdges(const std::vector<glm::vec3> &vtx,
		std::vector<glm::uvec3> &tri, std::vector<glm::uvec4> &edges);

void computeTangentBasis(std::vector<glm::vec3> & vertices,
		std::vector<glm::vec2> & uvs, std::vector<glm::vec3> & normals,
		std::vector<glm::vec3> & tangents, std::vector<glm::vec3> & bitangents);