Interleaved Texture Cache Line Allocation for Ray Tracing
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Solution Overview
Problem
In 3D computer graphics, ray tracing techniques require separate cache lines and texture data for each texture associated with a virtual object, leading to wasteful allocation and high computational expense, especially when light rays are incoherent, resulting in inefficient texture bandwidth usage.
Innovation Solution
The technique involves generating an interleaved texture by combining multiple textures into a single cache line, allowing for efficient access and reducing the need for separate cache lines, using multiple texture headers that make the interleaved texture opaque to software applications and users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate cache lines are allocated for each texture associated with a virtual object, then each texture can be accessed independently, but texture bandwidth usage increases and computational performance deteriorates when light rays are incoherent
Solution Approach 1:
The patent combines multiple separate textures into a single interleaved texture structure where texture data from multiple textures is interleaved within the same cache line. This merging approach allows the system to access multiple textures through a single cache line allocation, reducing the number of separate cache lines needed and improving computational performance when tracing incoherent light rays.
2Ease of manufacture
If separate cache lines are allocated for each texture, then texture data can be read separately for each texture, but the amount of texture bandwidth used increases
Solution Approach 1:
The patent merges multiple texture data streams into a single interleaved texture where data from multiple textures is combined within the same cache line structure. This allows the system to read texture data more efficiently by utilizing shared cache lines, thereby reducing the total quantity of texture bandwidth consumed during ray tracing operations.
3Productivity
If a single cache line is allocated for an interleaved texture, then texture bandwidth usage is reduced and computational performance improves, but the structure becomes more complex requiring multiple texture headers
Solution Approach 1:
The patent segments the interleaved texture structure by introducing multiple texture headers, where each header corresponds to a specific texture within the interleaved structure. This segmentation allows the system to manage and access different textures within the interleaved structure independently, reducing the complexity of managing the interleaved format while maintaining the performance benefits of shared cache lines.
Solution Approach 2:
The patent introduces texture headers as intermediary structures that mediate between the application layer and the interleaved texture data. These headers provide a mapping or indexing mechanism that allows the system to navigate the interleaved texture structure efficiently, reducing the complexity of direct access to interleaved data while maintaining improved computational performance.
Data Source
AI summary
Techniques are disclosed herein for interleaving textures. In the disclosed techniques, multiple textures that would otherwise be accessed separately are interleaved into a single, interleaved texture that can be used to access the multiple textures together. The interleaved texture can include alternating blocks from the multiple textures. The interleaved texture can be generated when the multiple textures are being loaded into memory. Further, the interleaved texture can be accessed using multiple texture headers that are associated with different textures in the interleaved texture. Each of texture headers includes a stride indicating the distance between two blocks from a same texture in the interleaved texture.