AMD FidelityFX Variable Shading (VS) provides an open source header implementation to easily integrate Variable Rate Shading into your game. The effect works by analyzing luminance variance in the previous frame and uses motion vectors to generate a shading rate image.
Supports:
- DirectX®12 Ultimate.
Download now - v1.0
Xbox Developers
An example use of AMD FidelityFX Variable Shading exists within the Xbox Game Development Kit samples.
Features
State-of-the-art algorithm
Optimized for Shader Model 6.0+
Open source, MIT license
Features of the implementation:
- AMD RDNA™ 2-optimized algorithm.
- Support for Direct3D®12 API.
- Shaders written in HLSL utilizing SM 6.0 wave-level operations.
A sample application is provided for Direct3D®12.
Comparison
 |
Full Shading Rate |  |
2×1 or 1×2 Shading Rate |  |
2×2 Shading Rate |
See AMD FidelityFX Variable Shading in action with DIRT® 5
Additional resources
Engineer Stephan Hodes provides a short description how VRS works, and how AMD’s FidelityFX Variable Shading technique can assist with integrating VRS into your engine.
A set of guidelines for developers on how to present options in the game’s user interface to enable/disable AMD FidelityFX Effects.
Find out what developers are saying about AMD FidelityFX.
More AMD FidelityFX effects
AMD FidelityFX – Super Resolution
AMD FidelityFX Super Resolution (FSR) is our open-source, high-quality, high-performance upscaling solution.
AMD FidelityFX – Parallel Sort
AMD FidelityFX Parallel Sort makes sorting data on the GPU quicker, and easier. Use our SM6.0 compute shaders to get your data in order.
AMD FidelityFX – Denoiser
AMD FidelityFX Denoiser is a set of denoising compute shaders which remove artefacts from reflection and shadow rendering.
AMD FidelityFX – Luminance Preserving Mapper
AMD FidelityFX LPM provides an open source library to easily integrate HDR and wide gamut tone and gamut mapping into your game.
AMD FidelityFX – Stochastic Screen Space Reflections
The AMD FidelityFX SSSR effect provides an open source library to easily integrate stochastic screen space reflections into your game.
AMD FidelityFX – Combined Adaptive Compute Ambient Occlusion
AMD FidelityFX Combined Adaptive Compute Ambient Occlusion (CACAO) is an RDNA-optimized implementation of ambient occlusion.
AMD FidelityFX – Single Pass Downsampler
FidelityFX Single Pass Downsampler (SPD) provides an RDNA-optimized solution for generating up to 12 MIP levels of a texture.
Cauldron Framework
Radeon™ Cauldron is our open source experimentation framework for DirectX®12 and Vulkan®.
AMD FidelityFX – Contrast Adaptive Sharpening
AMD FidelityFX Contrast Adaptive Sharpening (CAS) provides a mixed ability to sharpen and optionally scale an image.
Our other effects
FEMFX
A multithreaded CPU library for deformable material physics, using the Finite Element Method (FEM)
DepthOfFieldFX
The DepthOfFieldFX library provides a GCN-optimized Compute Shader implementation of Depth of Field using the Fast Filter Spreading approach.
GeometryFX
GeometryFX improves the rasterizer efficiency by culling triangles that do not contribute to the output in a pre-pass. This allows the full chip to be used to process geometry, and ensures that the rasterizer only processes triangles that are visible.
ShadowFX
ShadowFX library provides a scalable GCN-optimized solution for deferred shadow filtering. It supports uniform and contact hardening shadow (CHS) kernels.
TressFX
The TressFX library is AMD’s hair/fur rendering and simulation technology. TressFX is designed to use the GPU to simulate and render high-quality, realistic hair and fur.