原创【博客大赛】为AM335x+Linux移植SGX+OpenGL+Qt5之完全开发笔记(2)

 2016-6-1 17:15  1773 14 14 分类: MCU/ 嵌入式文集: Qt和Cpp

Step 2: About SGX

在编译目标板Qt之前，先要理解什么是SGX：

The SGX subsystem is a Texas Instruments instantiation of the POWERVR SGX530 core form Imagination Technologies Ltd.

The 2D/3D graphics accelerator (SGX) subsystem accelerates 2-dimensional (2D) and 3-dimensional (3D) graphics applications. The SGX subsystem is based on the POWERVRSGX core from Imagination Technologies. SGX is a new generation of programmable POWERVR graphic cores. The POWERVR SGX530 v1.2.5 architecture is scalable and can target all market segments from mainstream mobile devices to high-end desktop graphics. Targeted applications include feature phone, PDA, and hand-held games.

http://processors.wiki.ti.com/index.php/AM35x-OMAP35x_Graphics_SDK_Getting_Started_Guide

http://processors.wiki.ti.com/index.php/SGXDbg

http://processors.wiki.ti.com/index.php/Building_Qt

http://www.thing-printer.com/3d-rendering-pvr-sgx-beaglebone/

TI SOCs例如AM335x，具备3D核心，它能够使用dedicated hardware进行3D加速；而这里的delicated hardware就基于SGX技术；

Graphics cores是用来加速图形的，它并没有video decode功能，视频加速神马的和它没有关系；

视频加速和OpenGL ES1.1 OpenGL ES2.0有关（不推荐使用OpenVG 1.1），它们需要调用SGX驱动；

OpenGL可以做成单独的application，也可以做成Android、Qt、Xrog等的back-end。

SGX core没有包含在ARM核里，但是它的Graphics drivers需要跑在ARM核上（所有的东西都需要跑在ARM核上），怎么办呢？其实Graphics drivers包含有OS specific driver ，它能够将SGX core做内存映射，因此可在ARM core上对图形引擎SGX编程。