Optimizing 3D Graphics For Mobiles Mobiles Madan Kandula Director - - PowerPoint PPT Presentation

Optimizing 3D Graphics For Mobiles Mobiles

Madan Kandula Director

Introduction

• Cross-Platform games and apps using our engine

– PlayStation VITA, PlayStation 3 – iOS (iPhone, iPad) – Android – Windows

• Core expertise is real time 3D graphics

– openGL + GLES2, DirectX

• Provide custom graphic solutions to our clients

3D Graphics

Do I need 3D graphics ?

• Of course YES !!
• why ?

– GPU is very efficient in using power -> MORE BATTERY LIFE BATTERY LIFE – using the native 3D layer makes your app be extremely responsive – Competitive edge for your app !

GPU Information

• Mobiles use GPU’s which are usually tile based

deferred rendering

– screen is split into tiles – Each tile processed on a GPU core – Each tile processed on a GPU core

Graphics Tips : Culling

Level of Detail

Batch Your Rendering

• draw opaque objects first and then

transparent objects afterwards

– DO NOT MIX THEM for a tile based GPU

• draw objects of the same shader material
• draw objects of the same shader material

together

– otherwise too many context switch occurs – these take a lot of processing time – Difficult to detect unless capture/analysis tools are used

Use hardware depth culling

• Enable depth culling to avoid rendering of
• bstructed objects

– glEnable (GL_DEPTH_TEST)

• This culling takes place at pixel level after
• This culling takes place at pixel level after

raster stage and is automatically taken care by hardware

Finally..

• Optimize your shader code

– Check cycle count

• Check for glError after every context call
• Try avoiding memory management
• Try avoiding memory management

– Allocate once and reuse

• Submit render calls from a single thread

Thank YOU !!

• References

– Check PowerVR SDK and samples

• PowerVR Series 5.SGX Architecture Guide for

Developers.1.0.13.External

• http://www.imgtec.com/downloads.asp

– Android NDK

• http://developer.android.com/tools/sdk/ndk/index.html