GPU Tile Rendering Layout for Multi-View Cache Reuse
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Solution Overview
Problem
Existing graphics processing systems render all tiles of a first image before any tiles of a second image, leading to inefficiencies due to increased data transfer between the graphics processing unit and system memory, which can be improved by rendering multiple views of a scene together in an interspersed order.
Innovation Solution
Rendering tiles of multiple views of a scene in an interspersed order, where at least one tile from each view is rendered before any view is fully rendered, utilizing cache hit rates by sharing similar data between tiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all tiles of a first image are rendered before any tiles of a second image, then the rendering process is simple to implement, but data transfer between GPU and system memory increases significantly
Solution Approach 1:
The patent merges the rendering of multiple images by interleaving tile processing across different images. Instead of completing all tiles of one image before moving to the next, the system processes tiles from multiple images in an interspersed manner, allowing the GPU to maintain data in cache longer and reduce repeated memory accesses, thereby reducing energy consumption without significantly complicating the rendering pipeline
Solution Approach 2:
The patent applies preliminary action by pre-fetching and caching tile data for multiple images before rendering begins. By preparing and storing tile data in the GPU's cache memory in advance, the system reduces the need for frequent system memory accesses during the actual rendering process, thereby reducing energy consumption while maintaining implementation feasibility
2Device complexity
If all tiles of a first image are rendered before any tiles of a second image, then the rendering pipeline is easy to manage, but rendering speed decreases due to repeated data transfer
Solution Approach 1:
The patent combines the rendering operations of multiple images into a single interleaved processing sequence. By processing corresponding tiles from multiple images together in the GPU's cache memory, the system eliminates repeated data transfers to system memory, significantly improving rendering speed while adding only moderate complexity to the pipeline management through simple tile indexing and interleaving logic
3Ease of operation
If tiles are rendered in traditional sequential order, then memory access patterns are simple, but cache hit rates decrease leading to more data transfer
Solution Approach 1:
The patent merges tile processing across multiple images by interleaving their rendering sequences. This approach keeps corresponding tiles from different images in the GPU cache simultaneously, increasing the likelihood that cached data will be reused before being evicted. The memory access patterns remain relatively simple through systematic interleving, while cache hit rates improve significantly due to extended data retention in cache memory
Data Source
AI summary
Graphics processing systems may render multiple views of a scene (e.g. a sequence of frames) in a tile-based manner. Groups of views may be rendered together such that tiles from a group of views are rendered in an interspersed order such that at least one tile from each of the views in the group is rendered before any of the views of the scene in the group are fully rendered. In this way similar tiles from different views within a group may be rendered sequentially. If a particular rendered tile is similar to the next tile to be rendered then data stored in a cache for rendering the particular tile is likely to be useful for rendering the next tile. Therefore, when rendering the next tile less data needs to be fetched from the system memory which can significantly improve the efficiency of the graphics processing system.