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    • 9. 发明授权
    • Mechanism for reducing Z buffer traffic in three-dimensional graphics processing
    • 在三维图形处理中减少Z缓冲区流量的机制
    • US07218317B2
    • 2007-05-15
    • US10648496
    • 2003-08-25
    • Fred LiaoMichael Hong
    • Fred LiaoMichael Hong
    • G06T17/00
    • G06T15/005G06T15/405
    • Z buffer traffic experienced during graphics processing is reduced by using a compression mechanism to reduce the amount of information stored in the z buffer. The compression mechanism may be a delta-based z compression mechanism, which stores deltas in the z buffer rather than actual z values. These deltas may be used at a later time to compute the z values. By storing deltas instead of actual z values, the compression mechanism makes it possible to store significantly less information in the z buffer. By reducing the amount of information stored in the z buffer, less information will be read from and written to the z buffer, which in turn, reduces z buffer traffic. To further reduce z buffer traffic, selected deltas may be stored not in the z buffer but rather in a storage local to a graphics processing mechanism (GPM). Storing selected deltas in local storage obviates the need to read from or write to the z buffer for those deltas. As a result, z buffer traffic is even further reduced.
    • 通过使用压缩机制来减少图形处理期间经历的Z缓冲器流量,以减少存储在z缓冲器中的信息量。 压缩机制可以是基于delta的z压缩机制,其在z缓冲器中存储三角形,而不是实际的z值。 这些三角形可以在稍后的时间用于计算z值。 通过存储三角形而不是实际的z值,压缩机制使得可以在z缓冲器中存储明显更少的信息。 通过减少存储在z缓冲区中的信息量,将从Z缓冲区读取和写入较少的信息,这又减少了z缓冲区流量。 为了进一步减少z缓冲区流量,所选择的增量可以不存储在z缓冲器中,而是存储在图形处理机制(GPM)的本地存储器中。 将选定的三角形存储在本地存储器中避免了读取或写入这些三角形的z缓冲区的需要。 因此,z缓冲区流量进一步减少。
    • 10. 发明授权
    • Wavelength-selective optical add/drop switch
    • 波长选择性光分插开关
    • US5915051A
    • 1999-06-22
    • US792916
    • 1997-01-21
    • Jay N. DamaskThomas E. MurphyJuan FerreraMichael Hong Yeol LimHenry I. SmithHermann A. Haus
    • Jay N. DamaskThomas E. MurphyJuan FerreraMichael Hong Yeol LimHenry I. SmithHermann A. Haus
    • G02B6/12G02F1/313G08B6/28
    • G02B6/12007G02F1/3136G02B2006/12107G02B2006/12173
    • A wavelength-selective optical switch having a first input port for accepting a plurality of copropagating optical channels, each of the channels having a distinct wavelength band. The optical switch includes first and second output ports. A wavelength-selective optical filter is connected to receive the copropagating optical channels from the first input port to extract a selected one of the channels while allowing the remaining channels to copropagate to the first output port. An interferometric switch is connected to receive the selected extracted channel; the interferometric switch includes a controller for controlling propagation of the selected extracted channel to either the second output port, the optical filter, or both. The optical filter is connected to receive from the interferometric switch an optical channel to be combined with the remaining copropagating channels and all directed to the first output port. In a first control state of the controller, the interferometric switch is adapted to direct the selected extracted channel to the optical filter, while in a second control state of the controller, the interferometric switch is adapted to direct the selected extracted channel to the second output port. A second input port can be provided for accepting an injected optical channel having a wavelength band corresponding to the wavelength band of the selected extracted channel. This second input port is connected to direct the injected optical channel to the interferometric switch. In this scenario, the interferometric switch is adapted, in the second control state of the controller, to direct the injected channel to the optical filter, and is adapted to direct the injected channel, in a first control state of the controller, to the second output port.
    • 一种波长选择性光开关,具有用于接收多个共传播光信道的第一输入端口,每个信道具有不同的波段。 光开关包括第一和第二输出端口。 连接波长选择性滤光器以从第一输入端口接收共同传播的光通道,以提取所选择的一个通道,同时允许其余通道共同传播到第一输出端口。 连接干涉式开关以接收所选择的提取的通道; 干涉式开关包括控制器,用于控制所选择的提取的通道到第二输出端口,滤光器或两者的传播。 光滤波器被连接以从干涉式开关接收要与剩余的共同传播信道组合的光信道,并且全部被引导到第一输出端口。 在控制器的第一控制状态下,干涉式开关适于将所选择的提取的通道引导到滤光器,而在控制器的第二控制状态下,干涉式开关适于将所选择的提取的通道引导至第二输出 港口。 可以提供第二输入端口用于接受具有与所选择的提取的信道的波长带相对应的波长带的注入光信道。 该第二输入端口被连接以将注入的光通道引导到干涉式开关。 在这种情况下,在控制器的第二控制状态下,干涉式开关适应于将注入的通道引导到滤光器,并且适于在控制器的第一控制状态下将注入的通道引导到第二 输出端口