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const std::string SimpleParticleShader::VS = "#version 330 core\n"
"layout ( location = 0 ) in vec3 vertex_position;"
"layout ( location = 4 ) in vec4 position;"
"uniform mat4 M_v;"
"uniform mat4 M_p;"
"uniform float particleSize;"
"out float lifetime;"
"void main()"
"{"
"   vec4 position_viewspace = M_v * vec4( position.xyz , 1 );"

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SimpleEmitter::SimpleEmitter()
{
	// create 100 particles
	this->particles.resize( 100 );
	for ( uint i = 0 ; i < this->particles.size() ; ++i )
	{
		// give every particle a random position
		this->particles[i].position = lstd_random_between( vec3( -1.0f ) , vec3( 1.0f ) );
		this->particles[i].lifetime = lstd_random_between( 1.0f , 2.0f );
	}

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void SimpleEmitter::update( const float dt )
{
	for ( uint i = 0 ; i < this->particles.size() ; ++i )
	{
		// subtract from the particles lifetime
		this->particles[i].lifetime -= dt;

		// if the lifetime is below 0 respawn the particle
		if ( this->particles[i].lifetime <= 0.0f )
		{

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void SimpleEmitter::draw()
{
	glEnableVertexAttribArray( 0 );
	glEnableVertexAttribArray( 4 );

	// update the position buffer
	glBindBuffer( GL_ARRAY_BUFFER , this->positionBuffer );
	glBufferSubData( GL_ARRAY_BUFFER , 0 , this->particles.size()*4*sizeof(float) , this->positions );

	// vertex buffer

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#pragma once

#include "Z:/cpp/SRC/lgl3/include/lgl3_includes.hpp"
#include "Z:/cpp/SRC/lgl3/include/lglShader.hpp"



/*
emitter
*/

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#include "SimpleParticles.hpp"



/*
emitter
*/

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#pragma once

#include <fstream>
#include <iostream>
#include <string>
#include "timeutil.hpp"
#include "util.hpp"

class Owl;
extern Owl owlInstance;

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#include "Owl.hpp"

Owl owlInstance;

Owl::Owl()
{
	this->b_init = false;
}

Owl::~Owl()

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class vec3
{
public:
	float x;
	float y;
	float z;

	vec3( const float x = 0 , const float y = 0 , const float z = 0 ) : x(x) , y(y) , z(z) {}

	// add another vector to a vector like a += v;

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