SimpleEmitterConstructor.cpp

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 );
	}

	// create a vertex and position buffer
	this->vertexBuffer = lglGenBuffer();
	this->positionBuffer = lglGenBuffer();

	// fill the vertex buffer
	std::vector< float > vertices;
	vertices.push_back( 0.0f );
	vertices.push_back( 0.0f );
	vertices.push_back( 0.0f );

	vertices.push_back( 1.0f );
	vertices.push_back( 0.0f );
	vertices.push_back( 0.0f );

	vertices.push_back( 0.0f );
	vertices.push_back( 1.0f );
	vertices.push_back( 0.0f );

	vertices.push_back( 1.0f );
	vertices.push_back( 1.0f );
	vertices.push_back( 0.0f );

	glBindBuffer( GL_ARRAY_BUFFER , this->vertexBuffer );
	glBufferData( GL_ARRAY_BUFFER , vertices.size()*sizeof(float) , vertices.data() , GL_STATIC_DRAW );

	// fill the position buffer
	glBindBuffer( GL_ARRAY_BUFFER , this->positionBuffer );
	glBufferData( GL_ARRAY_BUFFER , this->particles.size()*4*sizeof(float) , this->positions , GL_DYNAMIC_DRAW );
}