Vertex Shader Attribute Storage Optimization
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Solution Overview
Problem
Graphics processing systems face inefficiencies when operating in instanced mode, particularly in storing and managing vertex shader output attributes, leading to unnecessary memory usage and power consumption due to storing multiple identical attribute values.
Innovation Solution
The system identifies vertex shader output attributes that depend solely on per-vertex or per-instance defined input attributes and stores only one copy of each relevant output attribute value, reusing it as needed across instances or vertices, thereby optimizing memory usage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple copies of identical vertex shader output attribute values are stored for each instance, then complete attribute data is available for all instances, but memory usage and power consumption increase unnecessarily
Solution Approach 1:
The patent applies the copying principle by creating virtual copies of attribute data through indexing. Instead of storing multiple physical copies of identical attribute values in memory, the system generates instance-specific attribute values by combining per-vertex attributes with per-instance attributes through indexed access. This allows complete attribute data to be available for all instances while minimizing actual memory storage requirements.
2Reliability
If multiple copies of identical vertex shader output attribute values are stored for each instance, then complete attribute data is available for all instances, but power consumption increases
Solution Approach 1:
The system uses virtual copying through indexed attribute access rather than physical duplication. By storing per-vertex and per-instance attribute separations and combining them through indexing operations, the system makes complete attribute data available for all instances without the energy cost of writing and managing multiple identical copies in memory.
3Measurement precision
If per-vertex and per-instance attributes are processed separately and stored individually, then attribute precision is maintained, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing attributes into per-vertex and per-instance components. This segmentation maintains precision by preserving the distinct nature of each attribute type while enabling efficient processing through separate storage and combination. The vertex shader program separately accesses and combines these segmented attributes through indexed operations.
Solution Approach 2:
The patent uses an intermediary indexing mechanism to bridge per-vertex and per-instance attributes. The index serves as a mediator that combines the two separate attribute sets without requiring complex processing logic, simplifying the overall system while maintaining attribute precision through structured access patterns.
Data Source
AI summary
A graphics processor includes a vertex shader 20 that processes input attribute values from a vertex buffer 26 to generate output vertex shaded attribute values 28 to be used by a rasterizer/fragment shader 22 of the graphics processor when processing an image for display. Vertex shader output attributes for which the vertex shader input attributes that the vertex shader output attribute depends on are defined solely on a per-vertex basis or solely on a per-instance basis are identified. Then, for such vertex shader output attributes, the vertex shader 20 stores, for use by the rasterizer/fragment shader 22 of the graphics processor when processing an image for display, only one copy of the vertex shader output attribute for a given vertex or instance, respectively, irrespective of the number of instances or vertices, respectively, that the output attribute value applies to.