图形处理器中段操作的设计与实现

Design and implementation of fragment operation in the GPU

段操作是片段在写入帧缓存之前所要进行的最后的操作,用来选择要写入帧缓存中的片段,以及根据条件改变帧缓存中的值。这些操作主要包括片段测试、混合、逻辑操作、累积缓冲区以及帧缓存清除和屏蔽等。文中提出一种实现图形处理中段操作的结构及方法,该结构可以在一个时钟周期内同时处理和输出4个像素。文中设计在Modelsim上进行了功能仿真,并在Xilinx的FPGA上进行了综合实现,结果表明该设计可以达到预期的效果。

Fragment operation is the last operation to be performed before the fragment is written to the frame buffer,it is used to select the fragment which is written to the frame buffer,and change the value in the frame buffer according to the condition. These operations include fragment testing,blending,logical operations,accumulate buffer,clear frame buffer,and mask. This paper presents a structure and method for implementing the fragment operation of graphics processing unit,which can process and output 4pixels at the same time in a clock cycle. The design has passed the functional simulation of the modelsim,and is implemented on the FPGA of Xilinx,the result shows sthat the design can achieve the expected results.