Ray Tracing Circuit Traversal for Lower Graphics Processing Overhead
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Solution Overview
Problem
Existing graphics processing systems face inefficiencies in performing ray tracing due to its high processing intensity, particularly in determining geometry intersections, which is crucial for realistic image rendering.
Innovation Solution
A graphics processor with a ray tracing circuit that accelerates ray tracing operations by using ray tracing acceleration data structures and a programmable execution unit to manage ray traversals, allowing for efficient handling of shader program routines during the traversal process, including restarting from the beginning when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ray tracing is performed using traditional rasterisation techniques, then processing intensity is reduced, but image realism and physical accuracy deteriorate
Solution Approach 1:
The patent segments the ray tracing process into two distinct parts: a dedicated ray tracing circuit that handles geometry intersection testing using acceleration data structures, and a programmable execution unit that handles shader routines. This segmentation allows each component to be optimized for its specific function, reducing overall processing intensity while maintaining image realism.
Solution Approach 2:
The patent introduces an intermediary communication mechanism between the ray tracing circuit and the programmable execution unit. The ray tracing circuit generates intermediate results (intersected geometry information) that are then passed to the programmable execution unit for further processing. This intermediary approach enables efficient collaboration between specialized hardware and flexible software execution.
2Productivity
If ray tracing acceleration data structures are used to determine geometry intersections, then processing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts the ray tracing acceleration data structure traversal logic from the main processing pipeline and implements it as a dedicated function within the ray tracing circuit. This extraction allows the complex data structure navigation to be handled by specialized hardware that is optimized for this specific task, improving efficiency without proportionally increasing overall device complexity.
Solution Approach 2:
The patent employs preliminary action by using acceleration data structures (such as bounding volume hierarchies) to pre-organize scene geometry information before ray tracing begins. This pre-organization allows for faster intersection testing during the actual rendering process, improving productivity while the data structure complexity is contained within a dedicated circuit.
3Adaptability or versatility
If shader program routines are executed during ray traversal, then rendering flexibility is improved, but processing time increases
Solution Approach 1:
The patent implements dynamics by allowing the execution unit to dynamically receive and execute different shader program routines based on the ray tracing results. The system can adaptively select which routines to execute and when, providing rendering flexibility while minimizing processing time by only executing necessary routines after geometry intersection is determined.
Solution Approach 2:
The patent segments the rendering process into two phases: first, the ray tracing circuit determines geometry intersections using acceleration data structures; second, the programmable execution unit executes appropriate shader routines. This segmentation separates the time-consuming geometry testing from the flexible but less intensive shader execution, reducing overall processing time while maintaining rendering flexibility.
Data Source
AI summary
A method of operating a graphics processor to perform ray tracing. The graphics processor includes a ray tracing circuit that can be messaged by the graphics processor's programmable execution unit during execution of a program to perform a respective traversal of the at least one ray tracing acceleration data structure to be traversed for that ray. The ray tracing circuit may need to stop a ray's traversal to return the ray's processing to the programmable execution unit before the ray's traversal is subsequently restarted. In that case, the ray's traversal is restarted from the beginning.