Reconfigurable Dual Texture Pipeline Shared Cache
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Solution Overview
Problem
Current graphics processing systems face inefficiencies in storing and retrieving texels for advanced filtering techniques like trilinear and anisotropic filtering, leading to slowed image processing due to inadequate texture cache performance.
Innovation Solution
A shared texture cache system that efficiently retrieves and processes multiple texel quads per clock cycle, configurable for different filtering types and sizes, reducing conflicts and optimizing data retrieval across multiple texture pipelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a shared texture cache is used between two texture pipelines, then cache efficiency and texel retrieval rate are improved, but cache conflict and access contention increase
Solution Approach 1:
The shared texture cache is divided into multiple independent banks, where each bank can be accessed independently by different texture pipelines. This segmentation allows parallel access to different cache banks, improving the texel retrieval rate while reducing access conflicts between pipelines.
Solution Approach 2:
A cache controller acts as an intermediary between the texture pipelines and the cache banks. It manages access requests from multiple pipelines, arbitrates conflicts, and coordinates read/write operations to ensure reliable cache access while maintaining high throughput.
2Adaptability or versatility
If the texture pipeline is reconfigured to process different numbers of texel quads per clock cycle, then adaptability to different filtering types is improved, but pipeline complexity increases
Solution Approach 1:
The texture pipeline is designed with dynamic reconfiguration capability, allowing it to adapt its processing width and texel quad retrieval rate based on the required filtering type (bilinear, trilinear, anisotropic). This dynamic adjustment enables the pipeline to optimize performance for different filtering operations without requiring multiple fixed pipelines.
Solution Approach 2:
The texture pipeline is designed as a universal, multi-functional unit that can handle various filtering types and texel sizes through a single reconfigurable architecture. This universality reduces the need for multiple specialized pipelines while maintaining adaptability to different rendering requirements.
3Speed
If more texel quads are retrieved per clock cycle, then image processing speed is improved, but cache bandwidth and memory access requirements increase
Solution Approach 1:
The texture cache pre-loads and stores texel quads in advance before they are needed by the texture pipeline. By maintaining texels in the cache memory ready for retrieval, the system can deliver multiple texel quads per clock cycle without proportionally increasing memory bandwidth requirements, as the data is already positioned in the cache.
Solution Approach 2:
The cache architecture uses a banked structure that adds a spatial dimension to data organization. This allows parallel access to multiple cache banks simultaneously, enabling high texel retrieval rates by distributing data across multiple independent access paths rather than increasing bandwidth on a single path.
Data Source
AI summary
Circuits, methods, and apparatus that provide texture caches and related circuits that store and retrieve texels in an efficient manner. One such texture circuit can provide a configurable number of texel quads for a configurable number of pixels. For bilinear filtering, texels for a comparatively greater number of pixels can be retrieved. For trilinear filtering, texels in a first LOD are retrieved for a number of pixels during a first clock cycle, during a second clock cycle, texels in a second LOD are retrieved. When aniso filtering is needed, a greater number of texels can be retrieved for a comparatively lower number of pixels.