/*
 * mesh.h
 * 	- wrapper for assimp http://www.assimp.org
 */

#pragma once

#include <glm/glm.hpp>

#include "animation.h"
#include "util.h"
#include "util_image.h"


struct mesh_info
{
	glm::mat4 model_transform;
	// NOTE: vertices, normals, and tex_coords have the same count
	uint num_vertices;
	glm::vec3* vertices;
	glm::vec3* normals;
	glm::vec3* texture_coords; // NOTE: stay aligned with other buffers
	uint num_indices;
	uint* indices;
	// FIXME: WTF? why are we storing a copy of the texture on each mesh_info
	// 	instead of once per mesh_group?
	util_image diffuse_texture;
	node_animation* node_anim;
};

struct mesh_group
{
	// TODO: this should be one big allocation since the mesh doesn't change
	// 	while running
	mesh_info** meshes;
	uint num_meshes;
};

struct simple_mesh
{
	glm::mat4 model_transform;
	uint num_vertices;
	glm::vec3* vertices;
	glm::vec3* vert_colors;
};


// NOTE: meshes loaded from assimp require texture coordinates, and a diffuse
// 	texture, which can be a seperate file, or embedded in the input file
bool
meLoadFromFile(mesh_group& mesh_group, const char* filepath);

simple_mesh*
meInitMesh(uint num_vertices);

void
meFreeMeshGroup(mesh_group& mesh_group);

void
meFreeSimpleMesh(simple_mesh* mesh);

void
meShutdownAssimp();