GPU Texture Visibility Passes for Lower Fetch and Decompression Latency
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Solution Overview
Problem
Existing graphics processing units (GPUs) face inefficiencies in generating render outputs due to the lack of optimized handling of texture data, particularly in terms of bandwidth and latency associated with fetching and decompressing compressed texture data, which affects overall processing efficiency.
Innovation Solution
A graphics processing system that performs rendering operations in two separate passes: an initial pass to determine primitive visibility and a further pass to generate output values, utilizing a texture cache system to manage texture data efficiently, including decompression and controlled retrieval based on initial pass information to optimize texture data application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If compressed texture data is fetched from memory during rendering, then texture data can be stored efficiently, but bandwidth and latency costs increase
Solution Approach 1:
The system performs a preliminary pass before the actual rendering pass to identify which primitives are visible and which texture data will be needed. This preliminary analysis allows the texture cache system to pre-load or prioritize texture data retrieval, avoiding bandwidth and latency penalties during the critical rendering phase by preparing texture data in advance based on visibility information.
Solution Approach 2:
The texture cache system autonomously manages texture data retrieval by using visibility information to determine which texture data to fetch and when. The system self-optimizes the texture data fetching process by identifying redundant or unnecessary texture data that would otherwise consume bandwidth, allowing the system to serve itself without external intervention while reducing overall bandwidth consumption.
2Ease of operation
If all texture data is fetched and decompressed during rendering, then texture data is readily available, but processing time and latency increase
Solution Approach 1:
The system extracts and processes only the essential visibility information from the rendering scene in a preliminary pass, separating this analysis from the main rendering process. By extracting visibility data beforehand, the system avoids the need to process and decompress all texture data during rendering, reducing processing latency while maintaining availability of necessary texture data through selective fetching based on the extracted visibility information.
3Device complexity
If a single-pass rendering approach is used, then processing is simpler, but texture data handling efficiency decreases
Solution Approach 1:
The rendering process is segmented into distinct passes: a preliminary pass that analyzes primitive visibility and determines texture data requirements, and a subsequent rendering pass that uses this information to efficiently fetch and apply texture data. This segmentation allows the system to optimize texture data handling by separating the analysis phase from the execution phase, improving overall productivity without unduly increasing complexity.
Solution Approach 2:
The preliminary pass generates visibility information that serves as feedback to control the texture data fetching and rendering processes. This feedback mechanism allows the system to adaptively manage texture data based on actual scene requirements, improving texture data handling efficiency by avoiding fetches for invisible or redundant textures while maintaining the necessary complexity for optimized performance.
Data Source
AI summary
Disclosed is a method of operating a graphics processor to generate a render output. A first initial processing pass is performed to determine texture visibility information at respective sampling positions within the render output. This texture visibility information is then used to control how texture data is obtained during a subsequent further processing pass that generates the render output.