Draw-Call Shader for Reducing GPU Memory Bandwidth
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Solution Overview
Problem
Conventional graphics processing systems face memory strain and performance bottlenecks due to large graphics state data requirements and inefficient data transfer between the CPU and GPU, particularly when rendering complex graphics scenes.
Innovation Solution
Implementing a draw-call shader program that generates and modifies graphics state information on-the-fly within a parallel processing subsystem, reducing the need for pre-calculated data storage and minimizing data transfer between the CPU and GPU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphics state information is pre-calculated and stored in system memory, then rendering completeness is improved, but system memory usage and memory bandwidth strain increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating only the essential draw call structure and basic graphics state information on the CPU, while deferring the calculation of detailed graphics state information to be generated on-demand by the GPU during rendering. This reduces the amount of data that must be pre-stored in system memory while ensuring rendering completeness through on-demand generation of required information.
Solution Approach 2:
The patent introduces an intermediary mechanism where the GPU generates graphics state information locally during rendering based on draw call parameters, rather than relying on pre-calculated data from the CPU. This intermediary generation process eliminates the need to transfer and store large volumes of graphics state data in system memory, reducing memory bandwidth strain while maintaining rendering completeness.
2Speed
If graphics state data is pre-calculated and transferred from CPU to GPU, then rendering readiness is improved, but memory bandwidth consumption increases
Solution Approach 1:
The patent applies preliminary action by preparing only the essential draw call parameters and basic structure on the CPU before rendering, rather than pre-calculating all graphics state information. This reduces the volume of data that must be transferred across the memory bandwidth, while ensuring rendering readiness by having the GPU generate the remaining graphics state information locally during the rendering process.
3Device complexity
If draw call calculations are performed by the CPU, then processing simplicity is improved, but CPU-GPU synchronization overhead increases
Solution Approach 1:
The patent extracts the graphics state information generation task from the CPU processing flow and relocates it to the GPU. The CPU only handles simple draw call parameter preparation, while the GPU independently generates the detailed graphics state information during rendering. This extraction eliminates the need for CPU-GPU synchronization regarding graphics state data, reducing synchronization overhead and improving processing efficiency.
4Quantity of substance
If draw call calculations are deferred to GPU, then system memory usage is reduced, but synchronization between CPU and GPU increases
Solution Approach 1:
The patent extracts the graphics state information generation from CPU pre-processing and places it within the GPU's rendering pipeline. This extraction allows the GPU to generate graphics state data independently during rendering without requiring synchronization with the CPU, thereby reducing both system memory usage and synchronization overhead simultaneously.
Data Source
AI summary
One embodiment sets forth a method for modifying draw calls using a draw-call shader program included in a processing subsystem configured to process draw calls. The draw call shader receives a draw call from a software application, evaluates graphics state information included in the draw call, generates modified graphics state information, and generates a modified draw call that includes the modified graphics state information. Subsequently, the draw-call shader causes the modified draw call to be executed within a graphics processing pipeline. By performing the computations associated with generating the modified draw call on-the-fly within the processing subsystem, the draw-call shader decreases the amount of system memory required to render graphics while increasing the overall processing efficiency of the graphics processing pipeline.