In the graphics engine for OS/2 Warp, Version 3, the presentation driver has to support only the current OS2_PM_DRV_ENABLE and DEVESC_ functions. A new enable subfunction call, OS2_PM_DRV_ENABLE: Subfunction 0Eh - QueryDeviceSurface, has been added so that the graphics engine can manage the formerly mandatory functions for presentation drivers.

This graphics engine is designed so that a developer can create a presentation driver with minimal effort, and then incrementally add function that supports specific hardware. In order to achieve this, the new graphics engine does the following:

• Manages Presentation Manager contextual and state information

• Performs rasterization into a linear address specified by the presentation driver

• Provides a set of device support routines