Method RenderSSR

Rtxpt/IntroSample.cpp:227–321

}
    
void IntroPathTracer::RenderSSR(nvrhi::CommandListHandle commandList, const SampleConstants& constants)
{
    ScopedPerfMarker perfMarker("SSR", commandList);
        
    // Get pipeline from hot-reloadable variant
    auto pipeline = m_ssrVariant ? m_ssrVariant->GetPipeline() : nullptr;
    if (!pipeline || !m_ssrBindingLayout)
        return; // Pipeline not yet compiled
        
    // Lazy creation of dedicated binding set (depends on render targets)
    auto depthHierarchy = m_depthHierarchyRenderer->m_depthHierarchy;
    if (!m_ssrBindingSet && depthHierarchy && m_renderTargets->SSRResult)
    {
        nvrhi::BindingSetDesc bindingSetDesc;
        bindingSetDesc.bindings = {
            nvrhi::BindingSetItem::PushConstants(0, sizeof(SSRPushConstants)),
            nvrhi::BindingSetItem::Texture_SRV(0, depthHierarchy),  // t_SSR_DepthHierarchy
            nvrhi::BindingSetItem::Texture_SRV(1, m_renderTargets->Depth),           // t_SSR_Depth
            nvrhi::BindingSetItem::Texture_SRV(2, m_renderTargets->SpecNormal),      // t_SSR_Normal
            nvrhi::BindingSetItem::Texture_SRV(3, m_renderTargets->RoughnessMetal),  // t_SSR_RoughnessMetal
            nvrhi::BindingSetItem::Texture_SRV(4, m_renderTargets->BaseColor),       // t_SSR_BaseColor
            nvrhi::BindingSetItem::Texture_SRV(5, m_ggxFilteredCubemap ? m_ggxFilteredCubemap : GetCommonPasses()->m_BlackCubeMapArray),  // t_SSR_CubemapGGX
            nvrhi::BindingSetItem::Texture_SRV(6, m_IrradianceCube ? m_IrradianceCube : GetCommonPasses()->m_BlackCubeMapArray),          // t_SSR_IrradianceCube
            nvrhi::BindingSetItem::Texture_SRV(7, GetEnvMapBaker()->GetBRDFLUT()),   // t_SSR_BRDFLUT
            nvrhi::BindingSetItem::Texture_UAV(0, m_renderTargets->SSRResult),       // u_SSR_Result
            nvrhi::BindingSetItem::Sampler(0, m_ssrSampler),                         // s_SSR_LinearClamp
            nvrhi::BindingSetItem::Sampler(1, m_nearestSampler),                     // s_SSR_NearestClamp
        };
        m_ssrBindingSet = GetDevice()->createBindingSet(bindingSetDesc, m_ssrBindingLayout);
    }
    
    if (!m_ssrBindingSet)
        return;

    nvrhi::Viewport viewport = GetView().GetViewport();
    uint32_t width = (uint32_t)(viewport.maxX - viewport.minX);
    uint32_t height = (uint32_t)(viewport.maxY - viewport.minY);
        
    // Extract view and projection matrices
    const auto& view = GetView();
    dm::float4x4 viewMatrix = dm::affineToHomogeneous(view.GetViewMatrix());
    dm::float4x4 projMatrix = view.GetProjectionMatrix(false);
    
    // SSR parameters
    float maxRayDistance = 100.0f;
    uint32_t maxSteps = 512;
    float thickness = 0.1f;
    float jitter = 0; // TODO: Use DLSS/TAA jitter
    uint32_t ssrNumMips = m_depthHierarchyRenderer ? m_depthHierarchyRenderer->GetNumMips() : 1;
        
    // Pack push constants (96 bytes)
    // See SSRPushConstants in SSRPasses.hlsl for layout
    SSRPushConstants pushConst;
    
    // View matrix rows (xyz) + projection diagonal (w)
    pushConst.viewRow0_P00 = dm::float4(viewMatrix.m_data[0], viewMatrix.m_data[1], viewMatrix.m_data[2], projMatrix.m_data[0]);
    pushConst.viewRow1_P11 = dm::float4(viewMatrix.m_data[4], viewMatrix.m_data[5], viewMatrix.m_data[6], projMatrix.m_data[5]);
    pushConst.viewRow2_P22 = dm::float4(viewMatrix.m_data[8], viewMatrix.m_data[9], viewMatrix.m_data[10], projMatrix.m_data[10]);