第十七篇:曲径通幽处，禅房花木深--初探WDDM驱动学习笔记(二)

Windows Display Driver Model (WDDM) Design Guide

http://msdn.microsoft.com/en-us/library/ff570593(v=vs.85).aspx

What's new for Windows 8.1 display drivers (WDDM 1.3)

What's new for Windows 8 display drivers (WDDM 1.2)

What's new for Windows 7 display drivers (WDDM 1.1)

这几节介绍了WDDM每一个更进版本的新特性, 在没有基础概念前, 描述这些特性意义不大.

这里,介绍几个WDDM1.2/WIN8引入的显示驱动类型:

• WDDM Full Graphics Driver: This is the full version of the WDDM graphics driver that supports hardware accelerated 2-D and 3-D operations. This driver is fully capable of handling all the render, display, and video functions. WDDM 1.0 and WDDM 1.1 are full graphics drivers. All Windows 8 client systems must have a full graphics WDDM 1.2 device as the primary boot device.
• WDDM Display Only Driver: This driver is supported only as a WDDM 1.2 driver and enables IHVs to write a WDDM based kernel-mode driver that is capable of driving display-only devices. Windows handles the 2-D or 3-D rendering by using software-simulated GPU. Display-only devices are not allowed as the primary graphics device on client systems.
• WDDM Render Only Driver: This driver is supported only as a WDDM 1.2 driver and enables IHVs to write a WDDM driver that supports rendering functionality only. Render-only devices are not allowed as the primary graphics device on client systems.

FULL全功能:支持2D,3D硬件加速, 支持渲染,显示和视频方面的功能,WIN8系统必须具有一个作为主(primary)启动类型的full类型的设备.

只有显示功能:Windows利用软件模拟负责了2D,3D的渲染功能, 它不能作秋primary设备存在系统中

只有渲染功能:渲染相对于计算, 这里理解为只有计算功能的驱动不知是否正确有待考证.