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    • 6. 发明授权
    • Graphics subsystem with fast clear capability
    • 图形子系统具有快速清晰的功能
    • US5805868A
    • 1998-09-08
    • US410100
    • 1995-03-24
    • Nicholas Murphy
    • Nicholas Murphy
    • G09G5/393G06F15/16
    • G09G5/393
    • A graphics subsystem in which a very fast clear operation is performed without the need to address each pixel, and without using memories which include a hardware fast-clear capability. This is implemented by using a reference frame counter: the window is divided up into n regions, where n is the range of the frame counter (i.e. n=2.sup.p, where p is the number of bits in the frame counter). Every time the application issues a clear command, the reference frame counter is incremented (and allowed to roll over if it exceeds its maximum value), and only the n.sup.th region is cleared. The clear updates the depth and/or stencil buffers to the new values and the frame count buffer with the reference value. This region is much smaller than the full region the application thinks it is clearing, so takes less time and hence gives the speed increase. When the local buffer is subsequently read and the frame count is found to be the same as the reference frame count, the local buffer data is used directly. The result of this arrangement is that the cost of clearing the depth and stencil buffers can be amortized over a number of clear operations (as issued by the application).
    • 一种图形子系统,其中执行非常快速的清除操作,而不需要对每个像素进行寻​​址,并且不使用包括硬件快速清除能力的存储器。 这通过使用参考帧计数器来实现:窗口被划分为n个区域,其中n是帧计数器的范围(即,n = 2p,其中p是帧计数器中的位数)。 每当应用程序发出清除命令时,参考帧计数器递增(如果超过其最大值则允许翻转),只有第n个区域被清除。 清除将深度和/或模板缓冲区更新为新值,并使用参考值更新帧计数缓冲区。 该区域远远小于应用程序认为清除的整个区域,因此需要更少的时间,从而提高速度。 当本地缓冲区随后被读取并且发现帧计数与参考帧计数相同时,直接使用本地缓冲器数据。 这种安排的结果是清除深度和模板缓冲区的成本可以通过许多明确的操作(由应用程序发布)来摊销。