Add Global SDF trace step scale for SSR reflections to handle SSR Quality

Source/Engine/Renderer/ScreenSpaceReflectionsPass.cpp

@@ -42,6 +42,8 @@ GPU_CB_STRUCT(Data {
     float TemporalEffect;
     float Intensity;
     float FadeOutDistance;
+    Float3 Padding0;
+    float RayTraceSDFStepScale;
     Matrix ViewMatrix;
     Matrix ViewProjectionMatrix;
     GlobalSignDistanceFieldPass::ConstantsData GlobalSDF;
@@ -191,21 +193,26 @@ GPUTexture* ScreenSpaceReflectionsPass::Render(RenderContext& renderContext, GPU
     // Pick effect settings
     int32 maxTraceSamples = 60;
     int32 resolveSamples = settings.ResolveSamples;
+    Data data;
     switch (Graphics::SSRQuality)
     {
     case Quality::Low:
         maxTraceSamples = 40;
         resolveSamples = Math::Min(resolveSamples, 2);
+        data.RayTraceSDFStepScale = 1.5f;
         break;
     case Quality::Medium:
         maxTraceSamples = 55;
         resolveSamples = Math::Min(resolveSamples, 4);
+        data.RayTraceSDFStepScale = 1.0f;
         break;
     case Quality::High:
         maxTraceSamples = 70;
+        data.RayTraceSDFStepScale = 0.8f;
         break;
     case Quality::Ultra:
         maxTraceSamples = 120;
+        data.RayTraceSDFStepScale = 0.6f;
         break;
     }
     int32 resolvePassIndex = 0;
@@ -217,7 +224,6 @@ GPUTexture* ScreenSpaceReflectionsPass::Render(RenderContext& renderContext, GPU
         resolvePassIndex = 1;
 
     // Setup data
-    Data data;
     GBufferPass::SetInputs(view, data.GBuffer);
     data.RoughnessFade = Math::Saturate(settings.RoughnessThreshold);
     data.MaxTraceSamples = static_cast<float>(maxTraceSamples);

Source/Shaders/SSR.shader

@@ -37,6 +37,8 @@ float RayTraceStep;
 float TemporalEffect;
 float Intensity;
 float FadeOutDistance;
+float3 Padding0;
+float RayTraceSDFStepScale;
 float4x4 ViewMatrix;
 float4x4 ViewProjectionMatrix;
 GlobalSDFData GlobalSDF;
@@ -155,7 +157,7 @@ float4 PS_RayTracePass(Quad_VS2PS input) : SV_Target0
     GlobalSDFTrace sdfTrace;
     float maxDistance = GLOBAL_SDF_WORLD_SIZE;
     sdfTrace.Init(gBuffer.WorldPos, reflectWS, 0.0f, maxDistance);
-    GlobalSDFHit sdfHit = RayTraceGlobalSDF(GlobalSDF, GlobalSDFTex, GlobalSDFMip, sdfTrace, 2.0f);
+    GlobalSDFHit sdfHit = RayTraceGlobalSDF(GlobalSDF, GlobalSDFTex, GlobalSDFMip, sdfTrace, 2.0f, RayTraceSDFStepScale);
     if (sdfHit.IsHit())
     {
         // Sample Global Surface Atlas