Shader Prologue Shared Functions for Constant Computation
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Solution Overview
Problem
Existing graphics processing unit (GPU) shader computations are inefficient due to repeated calculations of constants, leading to CPU bottlenecking and performance drops, especially with dynamic constant folding requiring recompilation and slow GPU memory reads.
Innovation Solution
Implement a shared function for multiple shader instances, executed as a prologue, to compute constant values across instances without accessing the constant buffer, thereby reducing redundant calculations and synchronization issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic constant folding is applied to optimize shader computations, then calculation efficiency is improved, but CPU usage increases and CPU bottlenecking occurs
Solution Approach 1:
The patent extracts the constant buffer access and folding computation from the CPU domain and relocates it to the GPU domain. The GPU directly accesses constants from the constant buffer and performs folding computations independently, removing the CPU bottleneck caused by reading constants and performing computations before shader execution.
Solution Approach 2:
The patent introduces an intermediary mechanism where the GPU itself serves as the mediator between the constant buffer and the shader computation. Instead of CPU reading constants and passing them to GPU, the GPU directly accesses the constant buffer and uses those constants in computations, eliminating the CPU intermediary role.
2Measurement precision
If constants are read from GPU memory for dynamic constant folding, then computation accuracy is improved, but performance drops due to slow GPU memory reads
Solution Approach 1:
The patent applies preliminary action by having the GPU access and process constants directly within the shader execution context before the actual shader computations begin. The constant buffer is accessed and folded computations are performed as part of the shader prologue, eliminating the need for separate slow memory read operations.
Solution Approach 2:
The patent merges the constant buffer access operation with the shader computation operation. Instead of separate steps of reading constants from memory and then performing computations, the patent combines these operations so that constants are accessed and immediately used in folding computations within the same execution context, reducing memory access overhead.
3Adaptability or versatility
If multiple shader instances access the constant buffer, then shader functionality is maintained, but synchronization issues and performance drops occur
Solution Approach 1:
The patent segments the constant buffer access operation so that each shader instance has its own independent access path to the constant buffer. Instead of multiple instances sharing a single access point that requires synchronization, each instance can independently read and fold constants without interfering with others, eliminating synchronization bottlenecks.
Solution Approach 2:
The patent implements a copying mechanism where constant values are copied into a local context or register file for each shader instance. Instead of all instances continuously accessing and potentially conflicting over the shared constant buffer, each instance has its own copy of the folded constants, eliminating synchronization issues while maintaining functionality.
Data Source
AI summary
A system creates a single shared instance of a shared function from shader code for multiple instances of the shader. The system creates multiple instances of a primary shader function from shader code to compute instance-specific values. The system creates the single instance of the shared function to compute a value used by the multiple instances of the primary shader function. A graphics execution unit can execute the multiple instances of the primary shader function, including calling the shared function from the multiple instances of the primary shader function.