Graphics Geometry Processing with Segmented Work Overhead Reduction
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Solution Overview
Problem
Traditional graphics processors rely on a 1:1 mapping between geometry work and fragment work, which can lead to inefficiencies and increased processing overhead, especially when handling segmented and non-segmented sets of geometry work.
Innovation Solution
The proposed solution introduces an N:1 mapping, where multiple sets of geometry work are grouped and processed by a single set of fragment work. This approach allows for segmented and non-segmented geometry kicks to be handled intelligently, reducing processing overhead by reusing segment identifiers and minimizing stitching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 1:1 mapping between geometry work and fragment work is used, then processing simplicity is maintained, but processing overhead increases and performance decreases
Solution Approach 1:
Multiple geometry kicks are merged into a single geometry completion group that shares common fragment work. This allows N geometry kicks to be processed with 1 fragment kick, reducing redundant processing overhead while maintaining organized control through group-based management. The merging enables better resource utilization without sacrificing too much control complexity.
Solution Approach 2:
The fragment work is designed to handle multiple geometry kicks universally through the N:1 mapping approach. A single fragment kick can consume outputs from N different geometry kicks, making the fragment processing unit more versatile and reducing the need for separate processing paths for each geometry kick.
2Speed
If segmented geometry kicks are processed in parallel, then processing speed improves, but processing overhead increases due to pre-parsing and stitching operations
Solution Approach 1:
Geometry kicks are divided into multiple segments that can be processed in parallel by different geometry processing pipelines. This segmentation enables simultaneous processing of different portions of the geometry data, improving overall processing speed while maintaining the ability to handle large geometry workloads efficiently.
Solution Approach 2:
The control stream is pre-parsed into segments before processing begins, allowing the system to prepare processing tasks in advance. This preliminary action enables parallel pipelines to start processing immediately without waiting for runtime parsing decisions, reducing actual processing overhead during execution.
Solution Approach 3:
Segment identifiers are reused across different geometry kicks and segments, creating a copying mechanism that avoids the need for unique identifiers for every segment. This reduces the overhead of identifier management and stitching operations, as the system can reference existing segment identifiers rather than creating and managing new ones for each segment.
3Loss of energy
If segment identifiers are reused across geometry kicks, then processing overhead is reduced, but data structure management becomes more complex
Solution Approach 1:
Segment identifiers serve multiple purposes: they identify segments within a geometry kick, identify geometry kicks in a completion group, and enable stitching operations. This universal use of segment identifiers simplifies the overall system by reducing the number of different identifier types needed, even though the management logic becomes more sophisticated.
Solution Approach 2:
The system uses feedback mechanisms to track which segment identifiers have been used and their current state. This feedback allows the system to intelligently reuse identifiers while maintaining data structure integrity, balancing the reduction of overhead with the complexity of management through automated tracking and state management.
Data Source
AI summary
Techniques are disclosed relating to geometry processing in graphics processors. In some embodiments, geometry processing circuitry is configured to execute multiple segments of a segmented set of geometry work at least partially in parallel using multiple geometry processing pipelines, execute a single-segment set of geometry work using a single geometry processing pipeline, and identify a group of multiple sets of geometry work that includes the segmented set and the single-segment set. Fragment processing circuitry may be configured to initiate execution of a single set of fragment processing work that consumes output data from the multiple sets of geometry work in the group. The geometry processing circuitry may utilize disclosed techniques to process the segmented and single-segment sets in a manner than mitigates overhead associated with segmented processing.