Apex Page

GAM531 Engine Assignment

Game Engine Apex

Repository

https://bitbucket.org/Apex_Page/

Team Members

1. Erquan Bi
2. Eunju Han
3. Ferenc Botos
4. eMail All

Enhancement

Title: Multi-threaded Node Absolute Calculator

Enhancement Result

• The frame flow is very smooth due to the transformation of the node chains which are updated concurrently and efficiently during rendering instead of being done sequentially.

• The program runs significantly faster. To show improved performance of the Emperor Engine, we used Performance and Diagnostic tool in Visual Studio on a lab computer. It shows that by using multiple threads, performance has improved 10 times.

Enhancement Process

• Class ThreadPool
  • An object of ThreadPool class is created at its initialization to accept threads in a vector called threads.
  • The number of threads depends on the number of the computer core systems, it can be obtained at the run time through std::thread::hardware_concurrency() in ThreadPool constructor.
  • The threadPool is a queue holding jobs which are defined as std::function, and a job is added into threadPool in AddJob function.
  • std::mutex and std::condition_variable is used to lock and unlock threads status and to wake threads respectively. In addition to, two bool type variables (quit and stopped) are flags to decline a new job while the thread pool is shutting down.
  • In Run function, the threadPool dispatches a job to each thread to be finished one by one until all jobs are done or the program is terminated.
  • The ShutDown function wakes all threads up and makes them join to be terminated.

• To Use the Threads
  • When the NodeManager performs the function updateValues for each active object from the vector activeObjects, jobs(active objects(Node)’ _updateAbs function) are added to the queue threadPool waiting to calculate node’s absolute transformation.
  • While adding jobs, one slept thread from the thread pool wakes up, and performs the Run function subsequently.
  • Before the function updateValues ends, threads are terminated through the ShutDown function of ThreadPool.

Work Load Division

• Member 1(Erquan (Ashley) Bi)
  • Worked on how many threads are needed and how they are being divided and dispatched form the thread pool to a vector of threads for each core to calculate node absolute transformation.

• Member 2 (Eunju Han)
  • Managed threads’ running and termination with determined threads and Merged code with Ashley’s work and tested with the client program (Lab8).

Source Code Repository https://bitbucket.org/Apex_Page/scs_emperor

<Multi-Thread Resources>

Multi-Threading of OOP345

C++ Multithreading Tutorial

std::thread

Sphere Collision or View Frustum Culling
<Sphere Collision Resources>
SIMPLE SPHERE-SPHERE COLLISION DETECTION AND COLLISION RESPONSE

3D Collision detection (C++) - Miguel Casillas

Pool Hall Lessons: Fast, Accurate Collision Detection Between Circles or Spheres

What is a good algorithm to detect collision between moving spheres?

Work Breakdown and Progress

BitBucket Fetching a remote reference
https://help.github.com/articles/fetching-a-remote/

Lab Workload Plan

• Anybody: lab1(Eunju)
  
• Ashley: lab2,5,8
  
• Eunju: lab3,6,9
  
• Frank: lab4,7,10
  

Lab completed

• Ashley: Lab2, 4, 5, 7, 10
  
• Eunju: Lab1, 3, 6, 8, 9
  

Tasks	Assigned	Completed Status	Due date
Lab 1	Eunju	Yes 2015-09-25	2015-09-25
Lab 2	Ashley	Yes 2015-10-02	2015-10-02
Lab 3	Eunju	Yes 2015-10-17	2015-10-09
Submit Proposal / Research Document	Group	YES	Friday October 16th, 2015
Lab 4	Frank Ashley	Yes 2015-11-03	2015-10-16
Lab 5	Ashley	Yes 2015-11-03	2015-11-03
Lab 6	Eunju	Yes 2015-11-07(1 min late because of merging issue)	2015-11-06
Lab 7	Frank Ashley	Yes 2015-11-13	2015-11-13
Lab 8	Ashley Eunju	Yes 2015-11-20	2015-11-20
Lab 9	Eunju	Yes 2015-11-26	2015-11-27
Lab 10	Frank Ashley	NO	2015-12-04
OpenGL Lab7	Ashley	NO	2015-11-13
OpenGL Lab8	Eunju	NO	2015-11-20
OpenGL Lab9	Eunju	NO	2015-11-27
OpenGL Lab10	Ashley	NO	2015-12-04
Submit Engine Enhancement	Group	YES	Friday November 27th, 2015
Submit Project (completed engine)	Group	NO	Thursday December 10th, 2015