Last revision: 18 August 2021 - raw.githubusercontent.com

1 Last revision: 18 August 2021 AMD FIDELITYFX SUPER RESOLUTION FIDELITYFX SUPER RESOLUTION IS FIDELITYFX SUPER RESOLUTION?AMD FidelityFX Super Resolution (FSR) is our open source high-quality solution designed toproduce high resolution frames from lower resolution uses a collection of cutting-edge methods with a particular emphasis on creating high-quality edges, giving large performance improvements compared to rendering at native resolution can enable practical performance for costly render operations, such as hardware ray FIDELITYFX SUPER RESOLUTION sourceProvided on GPUOpen under an MIT to integrateFull source samples and UE4 patch available in Xbox no historical optimizedHand-optimized for great performance across a wide variety of USE AMD FIDELITYFX SUPER RESOLUTION ResolutionGenerates super resolution image each input for any area scale factor between 1X and performance improvements over native on a wide variety of GPUs including older be ported onto multiple platforms without FIDELITYFX SUPER RESOLUTION Resolution runs on a wide range of GPUs.

2 No vendor-specific code path. Previous architectures supported current GPUs will benefit! Samples provided for DirectX 12 and Vulkan -but FSR shaders compile and run on DirectX 11 without restrictionAMD FIDELITYFX SUPER RESOLUTION SOURCEFull source of FidelityFX Super Resolution is hosted onGPUOpen Licensed under permissive MIT open source license. can be freely modified and redistributed subject to FIDELITYFX SUPER RESOLUTION TO INTEGRATES imple compute shaders No additional texture/buffer input. No separate rendering of alpha geometry. No history buffer. No motion vectors. Full source resolution renderSuper resolution outputCompute shadersConstant buffer parametersImage from Dirt 5 used with permission from Codemasters Integration effort estimatesLess than a day for engines supporting display resolution decoupled from render resolutionA few more days required to add support for such decoupling if not already supportedThe lowest barrier to entry Same great experience can be expected from FIDELITYFX SUPER RESOLUTION OPTIMIZEDF idelityFX Super Resolution is hand-optimized for great performance across a wide variety of GPUs.

3 Does not require enthusiast-class GPUs to run! VALU-bound shader on most in FP16 mode by default for faster performance with no visible quality impact. Note:Pre-Vega architectures that don t support FP16 packed maths may run the FP32 version of FSR 1 at better performance. Please refer to detection code in the FIDELITYFX SUPER RESOLUTION PERFORMANCE OVERHEADAll numbers measured on FSR public versionSee last page for configuration detailsFSR Target resolutionEnthusiast GPUs(AMD RADEON RX 6800XT, NVIDIA RTX 3080)Performance GPUs(AMD RADEON RX 6700XT, NVIDIA RTX 3060 Ti)Mainstream GPUs(AMD RADEON RX 5700XT, NVIDIA RTX 2060 SUPER)

4 4 KUltra msor ms or msor less1440pUltra msor msor msor lessAMD FIDELITYFX SUPER RESOLUTION QUALITY MODESFSR quality modeDescriptionScale factorInput resolutionOutput resolutionUltra QualityUltra Quality mode produces an image with quality virtually indistinguishable from native rendering. It should be selected when the highest quality is dimension( area scale)(77% screen resolution)1477 x 8311970 x 11082646 x 11082954 x 16621920 x 10802560 x 14403440 x 14403840 x 2160 QualityQualitymode produces a super resolution image with quality representative of native rendering, with a sizeable performance per dimension( area scale)(67% screen resolution)

5 1280 x 7201706 x 9602293 x 9602560 x 14401920 x 10802560 x 14403440 x 14403840 x 2160 BalancedBalancedmode produces a super resolution image approximating native rendering quality, with a major performance gain compared to per dimension( area scale)(59% screen resolution)1129 x 6351506 x 8472024 x 8472259 x 12701920 x 10802560 x 14403440 x 14403840 x 2160 PerformancePerformancemode visibly impacts image quality and should only be selected in situations where needing additional performance is per dimension(4x area scale)(50% screen resolution)960 x 5401280 x 7201720 x 7201920 x 10801920 x 10802560 x 14403440 x 14403840 x 2160 For consistency AMD recommends using these quality presets when exposing FSR in your game!

6 AMD FIDELITYFX SUPER RESOLUTION GUIDEAMD FIDELITYFX SUPER RESOLUTION STEPSC ompute shader header files: FSR and FidelityFX EASU and RCAS negative LoD bias for best results. ( ).hAMD FIDELITYFX SUPER RESOLUTION IN MY FRAME?Effects introducing noiseshould run after super resolution scalingFilm grain,chromatic aberration, renderTone mappingUpscaling pass (EASU)Sharpening pass (RCAS)Perceptual colorspace (sRGB, not linear)AMD FIDELITYFX SUPER RESOLUTION should be well anti-aliased. For example: TAA, MSAA, image must be normalized to [0-1]and be in perceptual space. Negative input result in RCAS will output NaN!

7 Image should be generated using negative MIP bias to increase texture should be FSR NEEDSAMD FIDELITYFX SUPER RESOLUTION : FsrEasuCon()to setup the EASU constants. Packs the input and output resolutions into a convenient block to copy to the GPU. Call FsrEasuConOffset()if you need an input SETUP FUNCTIONAMD FIDELITYFX SUPER RESOLUTION ()to setupthe RCAS constants. As RCAS works on full-screen images, the only input is SETUP FUNCTIONAMD FIDELITYFX SUPER RESOLUTION should be run as a compute a compute shader with needs 6 functions (3 for FP16(H) mode and 3 for FP32(F) mode) specified to handle texture loading:EASU SHADER PREPARATIONAMD FIDELITYFX SUPER RESOLUTION improve cache utilization, swizzle the dispatch threads using ARmp8x8included in The function assumes a linear 64 threadgroup:Then call FsrEasuH()/FsrEasuF()with the swizzled coordinates, and the constants we set up before.

8 EASU SHADER PREPARATIONAMD FIDELITYFX SUPER RESOLUTION further improve cache utilization, call the function four times in each thread. Finally, store the results, including a viewport offset if needed:AMD FIDELITYFX SUPER RESOLUTION should be run as a compute shader. Prepare a compute shader with needs six functions (two for each mode) specified to handle texture loading and colour-space conversion if needed:RCAS SHADER PREPARATIONAMD FIDELITYFX SUPER RESOLUTION improve cache utilization, swizzle the dispatch threads using ARmp8x8isincluded in The function assumes a linear 64 threadgroup:Then callFsrRcasH/FsrRcasH2/FsrEasuFwith the swizzled coordinates, and the constants we set up before:AMD FIDELITYFX SUPER RESOLUTION further improve cache utilization, call the function four times in each thread.

9 Finally, store the results, including a viewport offset if needed:RCAS SHADER PREPARATIONAMD FIDELITYFX SUPER RESOLUTION each invocation of the shader runs on four pixels, and the swizzle function assume 64 threads per thread group, divide the OUTPUT image resolution by 16 for the dispatch:That's it! You are now ready for DISPATCH THE SHADERAMD FIDELITYFX SUPER RESOLUTION MIP BIASA pplying a negative MIP bias will typically generate an upscaled image with better texture detail. Experiment for best to apply (adjust as desired): MIP bias = -log2(DisplayResolution/SourceResolution )Provided FSR samples set negative MIP bias slider to suitable defaults based on quality mode quality modeScale factorMIP biasUltra FIDELITYFX SUPER RESOLUTION sharpness parameter is specified in stops.

10 Sharpness halves with every whole number. Goes from (sharpest) to about Values above won t make a visible good recommended default value for RCAS Include is Adjust as needed based on SHARPENING AMOUNTAMD FIDELITYFX SUPER RESOLUTION DISPLAY SUPPORTI nput needs to be encoded as sRGB or Gamma UNORM. PQ or HLG are not suitable encodings for banding in input as FSR will highlight it further. Optimally use dithering to keep input as utilities included in Temporal Energy Preserving Dither helps avoid banding in input. Simple Reversible Tone-Mapper normalizes linear HDR. Quick approximate reversible PQ to Gamma FIDELITYFX SUPER RESOLUTION PRECISION FALLBACKFSR was designed to take advantage of half precision (FP16) for best performance.