Download the latest version - v1.1.4

This release of the AMD FidelityFX™ SDK adds the following features:

• Additions to the API and fixes for issues discovered.

Features

Details

AMD FidelityFX™ SSSR provides an open source library to easily integrate stochastic screen space reflections into your game.

The term “Screen Space Reflections” describes an effect that can create realistic looking reflections purely based on information already present in the rendered image. The underlying algorithm shoots reflection rays from a depth imprint of the rendered scene (a so-called “depth buffer”) and follows them in constant steps through the image until these rays intersect with the depth buffer again. Instead of taking constant-sized steps, AMD FidelityFX SSSR builds on an industry-leading algorithm that searches the rendered image in a hierarchical manner. This allows for larger and fewer steps on average, increasing performance of the search and quality of the final image.

To support glossy reflections, this AMD FidelityFX effect jitters the reflection rays to create the sense of surfaces with varying roughness. However, that approach inherently introduces noise. Thus, AMD FidelityFX SSSR comes with a high quality denoiser specifically optimized for the AMD RDNA™ architecture. The denoiser combines the results from multiple frames to create a noise-free image. Furthermore, it allows the ray count to decrease based on surface roughness, thus further speeding up screen space traversal. 

Library features

• Hierarchical depth buffer traversal kernel.
• Confidence based hit validation.
• Support for Direct3D® 12 API and Vulkan® API.
• Shaders written in HLSL utilizing SM 6.0 wave-level operations.

Sample application

A sample application is provided for Direct3D® 12 and Vulkan® showing the following features:

• Glossy reflections via ray jittering.
• Showcases AMD FidelityFX™ SPD to generate the depth buffer hierarchy.
• Showcases AMD FidelityFX™ Denoiser to achieve temporally stable reflections.

AMD FidelityFX™ Denoiser

AMD FidelityFX™ Denoiser is a set of denoising compute shaders which remove artefacts from reflection and shadow rendering..

AMD FidelityFX™ Single Pass Downsampler (SPD)

AMD FidelityFX™ Single Pass Downsampler (SPD) provides an AMD RDNA™ architecture optimized solution for generating up to 12 MIP levels of a texture.

Requirements

• Direct3D® 12
• Vulkan®

Version history