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FidelityFX Hybrid Reflections

alt text

This sample demonstrates the use of the FidelityFX Classifier and FidelityFX Denoiser techniques.

For details on the techniques that underpin the FidelityFX Hybrid Reflections effect you can refer to the respective FidelityFX Classifier documentation and FidelityFX Denoiser documentation.

Requirements

  • Windows
  • DirectX(R)12
  • Vulkan(R)

UI elements

The sample contains various UI elements to help you explore the techniques it demonstrates. The table below summarises the UI elements and what they control within the sample.

Element name Value Description
Show Debug Target Checked/Unchecked Enable/Disable debug target.
Visualizer Visualize Hit Counter, Show Reflection Target, Visualize Primary Rays Choose the target to visualize
Global Roughness Threshold 0.0 - 1.0 Modifies the roughness cutoff for ray tracing.
RT Roughness Threshold 0.0 - 1.0 Modifies the roughness cutoff for ray tracing.
Don't reshade Checked/Unchecked Use radiance from screen space shaded image (possible artifacts).
Enable Hybrid Reflections Checked/Unchecked Enable/Disable screen space hybridization.

Setting up FidelityFX Hybrid Reflections

The FidelityFX Hybrid Reflections sample uses FidelityFX Classifier to generate a denoise tile list and a ray tracing tile list, FidelityFX Single Pass Downsampler to create a depth hierarchy for depth buffer travesal, and FidelityFX Denoiser to remove noise from the results of tracing jittered reflection rays

Setting up FidelityFX Classifier

Include the interface for the backend of the FidelityFX Classifier API.

C++:

#include <FidelityFX/host/ffx_classifier.h>

Create FidelityFX Classifier context

    m_ClassifierInitializationParameters.flags = FfxClassifierInitializationFlagBits::FFX_CLASSIFIER_REFLECTION;
    m_ClassifierInitializationParameters.flags |= GetConfig()->InvertedDepth ? FFX_CLASSIFIER_ENABLE_DEPTH_INVERTED : 0;
    m_ClassifierInitializationParameters.resolution.width  = resInfo.RenderWidth;
    m_ClassifierInitializationParameters.resolution.height = resInfo.RenderHeight;
    m_ClassifierInitializationParameters.backendInterface  = m_BackendInterface;
    FFX_ASSERT(ffxClassifierContextCreate(&m_ClassifierContext, &m_ClassifierInitializationParameters) == FFX_OK);

Set up the dispatch parameters and dispatch

    FfxClassifierReflectionDispatchDescription dispatchParameters = {};
    dispatchParameters.commandList               = ffxGetCommandList(pCmdList);
    ...
    FfxErrorCode errorCode = ffxClassifierContextReflectionDispatch(&m_ClassifierContext, &dispatchParameters);

Setting up depth downsampler

Include the interface for the backend of FidelityFX Single Pass Downsampler (SPD) API.

C++:

#include <FidelityFX/host/ffx_spd.h>

Create FidelityFX SPD context

    m_SpdInitializationParameters.flags = 0;
    m_SpdInitializationParameters.flags |= FFX_SPD_WAVE_INTEROP_WAVE_OPS;
    m_SpdInitializationParameters.downsampleFilter = GetConfig()->InvertedDepth ? FFX_SPD_DOWNSAMPLE_FILTER_MAX : FFX_SPD_DOWNSAMPLE_FILTER_MIN;
    m_SpdInitializationParameters.backendInterface = m_BackendInterface;
    FFX_ASSERT(ffxSpdContextCreate(&m_SpdContext, &m_SpdInitializationParameters) == FFX_OK);

Copy the depth buffer into the depth hierarchy, set up the dispatch parameters, and dispatch

    FfxSpdDispatchDescription dispatchParameters = {};
    dispatchParameters.commandList               = ffxGetCommandList(pCmdList);
    ...
    FfxErrorCode errorCode = ffxSpdContextDispatch(&m_SpdContext, &dispatchParameters);

Setting up the FidelityFX Denoiser

Include the interface for the backend of the FidelityFX Denoiser API.

C++:

#include <FidelityFX/host/ffx_denoiser.h>

Create the FidelityFX Denoiser context

    m_DenoiserInitializationParameters.flags                      = FfxDenoiserInitializationFlagBits::FFX_DENOISER_REFLECTIONS;
    m_DenoiserInitializationParameters.windowSize.width           = resInfo.RenderWidth;
    m_DenoiserInitializationParameters.windowSize.height          = resInfo.RenderHeight;
    m_DenoiserInitializationParameters.normalsHistoryBufferFormat = GetFfxSurfaceFormat(m_pNormal->GetFormat());
    m_DenoiserInitializationParameters.backendInterface           = m_BackendInterface;
    FFX_ASSERT(ffxDenoiserContextCreate(&m_DenoiserContext, &m_DenoiserInitializationParameters) == FFX_OK);

Set up the dispatch parameters and dispatch

    FfxDenoiserReflectionsDispatchDescription denoiserDispatchParameters = {};
    denoiserDispatchParameters.commandList = ffxGetCommandList(pCmdList);
    ...
    FfxErrorCode errorCode = ffxDenoiserContextDispatchReflections(&m_VRSContext, &dispatchParameters);

Sample controls and configurations

For sample controls, configuration, and FidelityFX Cauldron Framework UI element details, see Running the samples.

See also