SimpleEmitterDraw.cpp

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
	glBindBuffer( GL_ARRAY_BUFFER , this->vertexBuffer );
	glVertexAttribPointer( 0 , 3 , GL_FLOAT , GL_FALSE , 0 , nullptr );

	// position buffer
	glBindBuffer( GL_ARRAY_BUFFER , this->positionBuffer );
	glVertexAttribPointer( 4 , 4 , GL_FLOAT , GL_FALSE , 0 , nullptr );
	glVertexAttribDivisor( 4 , 1 );

	// draw triangles
	lglDrawArraysInstanced( GL_TRIANGLE_STRIP , 0 , 4 , this->particles.size() );

	glDisableVertexAttribArray( 0 );
	glDisableVertexAttribArray( 4 );
}