Evaluation of Antialiasing Techniques on Mobile Devices

1. Evaluation of Antialiasing Techniques on Mobile Devices Tiago Almeida, João Madeiras and João Jorge ICGI 2019
2. Motivation 2 Horizon Zero Dawn
3. Motivation 3 Horizon Zero Dawn Source: VentureBeat
4. Outline • Goals • Antialiasing techniques • Methodology • Results • Conclusions • Demo 4
5. Goals • Study state of the art antialiasing solutions • Compare the techniques on a mobile device • Develop a mobile application for benchmarks 5
6. Goals • Which antialiasing techniques are faster? • Which one obtains the best image quality? • What should be explored on mobile antialiasing? 6
7. Aliasing 7
8. Antialiasing techniques • Multisampling • FXAA • Morphological AA • Temporal AA 8
9. Multisampling Antialiasing (MSAA) 9
10. Fast Approximate Antialiasing (FXAA) • Post-processing technique • Based on the contrast among neighbors • Blend colors to prevent discontinuities 10
11. Morphological Antialiasing (SMAA) • Identify perceptually visible edges • Re-vectorize edges to calculate area • Blend with neighbors according to area 11
12. Temporal Antialiasing 12 History Temporal pass • Use frame history information • Camera frustum jitter • Reprojection using velocity buffer
13. Methodology 13
14. Methodology 14 150k vertices Textures 1 million vertices Crytek Sponza Hairball
15. Methodology • Collect performance metrics using Snapdragon Profiler ◦ GPU utilization, memory, temperature • Compare image results with Structural Similarity Index (SSIM) • Analyze image details produced by each technique 15
16. Results - Framerate 16 Crytek Sponza (FPS)
17. Results - Framerate 17 Hairball (FPS)
18. Results - GPU Memory 18 Average Memory Read per Frame (MB)
19. Performance results • FXAA obtained best results • MSAA slower on high-polygon • SMAA with temporal reprojection is the slowest 19
20. Results - Image Quality 20 MSAA 4x FXAA SMAA 1x SMAA T2x TAA No AA
21. Results - Structural Similarity Index (SSIM) 21
22. Image quality results • SMAA and MSAA with best quality • FXAA blurs the details 22
23. Demo 23
24. Conclusions • Multisampling and FXAA have better performance • SMAA with temporal reprojection has better image quality • MSAA provides the best balance 24
25. Thank you Tiago Almeida almeidatiago56@gmail.com 25
26. Results - GPU Shader Processing 26 Fragment Instructions per Frame (in millions)
27. Results - GPU Shader Processing 27 No AA MSAA 4x FXAA SMAA 1x SMAA T2x TAA % Shaders Busy 91.4 79.3 92.1 92.3 87.1 85.6 % Time ALU working 53.6 43.6 53.6 50.7 49.5 52.3 % Time Shading Fragments 37.4 38.7 41.0 48.8 53.2 44.8 Mean values on Crytek Sponza
28. Summary • Research novel antialiasing techniques • Created an Android application to test them • SMAA obtains the best image quality • MSAA and FXAA best performance 28