libTangerine/include/entity.h

#pragma once

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>

#include "mesh.h"
#include "render_group.h"

// NOTE: an entity is the basic unit of the high level renderer interface
struct entity
{
	// NOTE: glm::mat4 combines translation, scale, and rotation in a 4x4
	// 	transform matrix. This is the equivalent of the 'model' matrix in
	// 	the model, view, projection matrix composition
	glm::mat4 world_transform;

	// TODO: should be a pointer into a global array of mesh_info(s) or
	// 	mesh_groups stored on the render_state object
	meMeshGroup mesh_group;

	// NOTE: an array of render objects with all the vertex, normal, and uv
	// 	data loaded from assimp
	render_object* ren_objects;
	uint ren_object_count;

	//render_group* ren_group;
};

// NOTE: an entity group is an array of entities rendered with the same shader
// 	program
struct entity_group
{
	entity* entities;
	uint entity_count;

	rg_shader_program shader_prg;
};

inline void
entTranslate(entity& e, glm::vec3 v)
{
	e.world_transform = glm::translate(e.world_transform, v);
}

inline void
entScale(entity& e, glm::vec3 v)
{
	e.world_transform = glm::scale(e.world_transform, v);
}

bool entInit(entity& e, const char* model_path, rg_shader_program& shader);

void entFree(entity& e);

void entSetWorldPosition(entity& e, float x, float y, float z);