GLTF Viewer: added SSR scale parameter; disable SSR when debug view is enabled

Author: TheMostDiligent

Samples/GLTFViewer/assets/shaders/ApplyPostEffects.psh

@@ -21,7 +21,8 @@ float4 main(in FullScreenTriangleVSOutput VSOut) : SV_Target
     float4 SSR   = g_tex2DSSR.Load(int3(VSOut.f4PixelPos.xy, 0));
     float4 IBL   = g_tex2DIBL.Load(int3(VSOut.f4PixelPos.xy, 0));
 
-    Color.rgb += (SSR.rgb - IBL.rgb) * SSR.w * Color.a;
+    float SSRScale = g_Frame.PrevCamera.f4ExtraData[0].x;
+    Color.rgb += (SSR.rgb - IBL.rgb) * SSR.w * Color.a * SSRScale;
 
     {
         // Perform tone mapping

Samples/GLTFViewer/src/GLTFViewer.cpp

@@ -929,11 +929,6 @@ void GLTFViewer::UpdateUI()
                 CreateGLTFRenderer();
                 LoadModel(m_ModelPath.c_str());
             }
-            if (ImGui::Checkbox("Post processing", &m_bEnablePostProcessing))
-            {
-                CreateGLTFRenderer();
-                CrateEnvMapRenderer();
-            }
 
             ImGui::TreePop();
         }
@@ -955,6 +950,19 @@ void GLTFViewer::UpdateUI()
             AlphaModeCheckbox("Blend", GLTF_PBR_Renderer::RenderInfo::ALPHA_MODE_FLAG_BLEND);
             ImGui::TreePop();
         }
+
+        if (ImGui::TreeNode("Post Processing"))
+        {
+            if (ImGui::Checkbox("Enable", &m_bEnablePostProcessing))
+            {
+                CreateGLTFRenderer();
+                CrateEnvMapRenderer();
+            }
+
+            ImGui::SliderFloat("SSR scale", &m_ShaderAttribs.SSRScale, 0.f, 1.f);
+
+            ImGui::TreePop();
+        }
     }
     ImGui::End();
 }
@@ -1021,6 +1029,11 @@ void GLTFViewer::Render()
         FrameAttribs->Camera     = CurrCamAttribs;
         FrameAttribs->PrevCamera = PrevCamAttribs;
 
+        FrameAttribs->PrevCamera.f4ExtraData[0].x =
+            (m_RenderParams.DebugView == GLTF_PBR_Renderer::DebugViewType::None) ?
+            m_ShaderAttribs.SSRScale :
+            0;
+
         {
             if (m_BoundBoxMode != BoundBoxMode::None)
             {

Samples/GLTFViewer/src/GLTFViewer.hpp

@@ -98,6 +98,8 @@ class GLTFViewer final : public SampleBase
 
         float4 HighlightColor = float4{0, 0, 0, 0};
         float4 WireframeColor = float4{0.8f, 0.7f, 0.5f, 1.0f};
+
+        float SSRScale = 1;
     };
     ShaderParams m_ShaderAttribs;