Hybrid Multisample Supersample Antialiasing for Graphics Rendering

Solution Overview

Problem

Conventional graphics processing techniques face inefficiencies in antialiasing, particularly when dealing with high-frequency effects like textured alpha transparency and specular highlights, as they often require either excessive shading or repetitive processing, leading to performance issues and aliasing artifacts.

Innovation Solution

A system and method for dynamically adjusting the pixel sampling rate, allowing shading rates to vary from once per pixel to once per sample, using a combination of supersample and multisample antialiasing by processing clusters of sub-pixel samples in multiple passes to produce hybrid-antialiased pixels, thereby improving image quality or performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If supersampling is used to avoid aliasing artifacts in high-frequency effects, then image quality is improved, but shading performance deteriorates due to the extreme cost of shading every sample

Engineering Contradiction:

Improveimage qualityVSAvoidshading performance

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies local quality by differentiating shading rates across different regions and effects. High-frequency effects like specular highlights and textured alpha transparency receive higher shading rates (supersampling), while low-frequency textured surfaces use lower shading rates (multisampling). This selective approach improves image quality where needed without uniformly increasing shading cost across the entire scene.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic shading rate adjustment based on the specific geometry and effects being rendered. The system dynamically selects shading rates ranging from once per pixel to once per sample depending on the rendering context, allowing optimal performance-quality balance that adapts to different geometric configurations and effect requirements.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multisampling is used for primitive edges, then shading performance is improved, but image quality deteriorates for high-frequency effects due to insufficient sampling

Engineering Contradiction:

Improveshading performanceVSAvoidimage quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by differentiating shading rates across different regions and effects. High-frequency effects like specular highlights and textured alpha transparency receive higher shading rates (supersampling), while low-frequency textured surfaces use lower shading rates (multisampling). This selective approach improves image quality where needed without uniformly increasing shading cost across the entire scene.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic shading rate adjustment based on the specific geometry and effects being rendered. The system dynamically selects shading rates ranging from once per pixel to once per sample depending on the rendering context, allowing optimal performance-quality balance that adapts to different geometric configurations and effect requirements.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If supersampling is used to avoid aliasing artifacts, then image quality is improved, but device complexity increases due to multiple processing passes

Engineering Contradiction:

Improveimage qualityVSAvoidprocessing complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the supersampling process into multiple passes, where each pass processes a subset of samples. Instead of shading all samples in a single complex operation, the rendering is broken down into manageable passes that can be executed sequentially, reducing the complexity of any single processing step while achieving the same overall image quality.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8605087B2Hybrid multisample/supersample antialiasing

Publication Date: 2013.12.10 NVIDIA CORP

AI summary

A system and method for dynamically adjusting the pixel sampling rate during primitive shading can improve image quality or increase shading performance. Hybrid antialiasing is performed by selecting a number of shaded samples per pixel fragment. A combination of supersample and multisample antialiasing is used where a cluster of sub-pixel samples (multisamples) is processed for each pass through a fragment shader pipeline. The number of shader passes and multisamples in each cluster can be determined dynamically for each primitive based on rendering state.