[TA-Frost Wolf_may-"Hundred Talents Project"] Graphics 4.4 Introduction to Anti-Aliasing

[TA-Frost Wolf_may-"Hundred Talents Project"] Graphics 4.4 Anti-Aliasing Introduction

• • @[TOC]([TA-Frost Wolf_may-"Hundred Talents Project"] Graphics 4.4 Anti-Aliasing Introduction
  • 4.4.1 How Antialiasing Works
  • 4.4.2 SSAA Super Sample Anti-aliasing
  • • 4.4.3 MSAA Multisample Anti-aliasing
  • 4.4.4 TemporalAA Temporal Antialiasing
  • 4.4.5 FXAA Fast Approximate Anti-Aliasing
  • 4.4.6 Antialiasing Speed ​​Sorting
  • 4.4.7 Additional Antialiasing
  • MSAA in Mobile
  • Assignments
  • • Compare the pros and cons of each antialiasing scheme:

4.4.1 How antialiasing occurs

4.4.2 SSAA Super Sample Anti-aliasing

Assuming that the final output resolution is 800x600, 4xSSAA will first render to a buffer with a resolution of 1600x1200, and then directly downsample the enlarged dead white buffer to 800x600.This method is mathematically perfect for antialiasing.However, the disadvantage is also obvious. The symbol load of the rasterization and fragment shader stages is four times the original, and the size of the render target has also increased by four times.

4.4.3 MSAA Multisample Anti-aliasing

Originally only one point was sampled, so there was no gradient effect, now sample four points and calculate the color with a percentage to achieve a gradient effect.

So MSAA focuses on the rasterization and fragment shader stages:

• Percentage recorded during rasterization
• Fragment shader color according to percentage
  

4.4.4 TemporalAA Temporal Antialiasing

1. Distribute the process of multiple sampling to each frame, and each frame saves the small data from the previous frames on average;
2. Each frame will have a certain offset, inheriting MSAA sampling;
3. Use the motion vector to store the offset of the movement per frame;
   

4.4.5 FXAA Fast Approximate Anti-Aliasing

1. Effective blur blending with edge detection
2. Done during post-processing and does not depend on hardware support

4.4.6 Antialiasing Speed ​​Sorting

1. FXAA
2. TemporalAA
3. MSAA
4. SSAA

4.4.7 Additional Antialiasing

Forward Rendering: SSAA, MSAA, CSAA, RGSS
Deferred Rendering: FXAA, MLAA, SMAA
Temporal Antialiasing: TemporalAA, TXAA
Deep Learning Based: DLAA

MSAA in mobile

Honor 30Pro+ supports MSAA

The average frame rate is 59.7 frames when the "4x anti-aliasing" setting is not turned on
The frame rate is 59.6 frames when turned on
It can be found that the effect on the frame rate is not large, but the temperature of the GPU will be affected.obvious impact.

Assignments

Compare the pros and cons of each antialiasing scheme: