NDLI: The F-buffer: a rasterization-order FIFO buffer for multi-pass rendering

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The F-buffer: a rasterization-order FIFO buffer for multi-pass rendering

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The F-buffer: a rasterization-order FIFO buffer for multi-pass rendering

Content Provider	ACM Digital Library
Author	Proudfoot, Kekoa Mark, William R.
Abstract	Multi-pass rendering is a common method of virtualizing graphics hardware to overcome limited resources. Most current multi-pass rendering techniques use the RGBA framebuffer to store intermediate results between each pass. This method of storing intermediate results makes it difficult to correctly render partially-transparent surfaces, and reduces the performance of shaders that need to preserve more than one intermediate result between passes. We propose an alternative approach to storing intermediate results that solves these problems. This approach stores intermediate colors (or other values) that are generated by a rendering pass in a FIFO buffer as the values exit the fragment pipeline. On a subsequent pass, the contents of the FIFO buffer are fed into the top of the fragment pipeline. We refer to this FIFO buffer as a fragment-stream buffer (or F-buffer), because this approach has the effect of associating intermediate results with particular rasterization fragments, rather than with an (x,y) location in the framebuffer. Implementing an F-buffer requires some changes to current mainstream graphics architectures, but these changes can be minor. We describe the design space associated with implementing an F-buffer, and compare the F-buffer to recirculating pipeline designs. We implement F-buffers in the Mesa software renderer, and demonstrate our programmable-shading system running on top of this renderer.
Starting Page	57
Ending Page	64
Page Count	8
File Format	PDF
ISBN	158113407X
DOI	10.1145/383507.383527
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2001-08-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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