公开(公告)号：US20010045958A1

公开(公告)日：2001-11-29

申请号：US09190754

申请日：1998-11-12

Applicant: HEWLETT-PACKARD COMPANY

Inventor： ROLAND M. HOCHMUTH ,  SAMUEL C. SANDS ,  LARRY J. THAYER ,  GAYANI N.K. GAMAGE

IPC: G09G005/00

CPC classification number: G06F3/14

Abstract: A method and apparatus for processing primitives in a computer graphics display system. The apparatus comprises a graphics device which receives commands and data from a host computer of the computer graphics display system. The data includes clip coordinates which are perspective projected by the graphics device into window coordinates. The host computer of the computer graphics display system is programmed to execute a geometry processing pipeline which transforms object coordinates associated with a primitive into clip coordinates which are then delivered to the graphics device. The graphics device then performs perspective projection on the clip coordinates to transform the clip coordinates into window coordinates. In accordance with the preferred embodiment of the present invention, the geometry processing pipeline being executed by the host computer performs a transformation which transforms the object coordinates into window clip coordinates and then delivers the window clip coordinates to the graphics device. The graphics device then performs perspective projection on the window clip coordinates to transform them into window coordinates. In accordance with an alternative embodiment of the present invention, the geometry processing pipeline being executed in the host computer performs a transformation which transforms the object coordinates into eye coordinates and then transforms the eye coordinates into clip coordinates. The clip coordinates are then delivered to the graphics device, which transforms the clip coordinates into window coordinates.

Abstract translation: 一种用于在计算机图形显示系统中处理原语的方法和装置。 该装置包括从计算机图形显示系统的主计算机接收命令和数据的图形装置。 数据包括由图形设备投影到窗口坐标的透视图的剪辑坐标。 计算机图形显示系统的主计算机被编程为执行几何处理流水线，其将与基元相关联的对象坐标转换成剪辑坐标，然后将其传送到图形设备。 然后，图形设备对剪辑坐标执行透视投影，以将剪辑坐标转换为窗口坐标。 根据本发明的优选实施例，由主计算机执行的几何处理流水线执行将对象坐标变换为窗口剪辑坐标的变换，然后将窗口剪辑坐标传送到图形设备。 然后，图形设备对窗口剪辑坐标执行透视投影，以将其转换为窗口坐标。 根据本发明的替代实施例，在主计算机中执行的几何处理流水线执行将对象坐标转换为眼坐标，然后将眼坐标转换为剪辑坐标的变换。 然后，剪辑坐标被传递到图形设备，其将剪辑坐标转换为窗口坐标。