ViewerRenderer: Render vector overlay post-accumulation in skip output mode

viewer/glow-extras/viewer/ViewerRenderer.cc

@@ -337,23 +337,7 @@ void glow::viewer::ViewerRenderer::renderSubview(
                   + tg::vec3::unit_y * (0.5f * (boundingInfo.aabb.max.y - boundingInfo.aabb.min.y) + scene.config.sunOffsetFactor * boundingInfo.diagonal);
 
     // pass lambdas
-    auto performOutput = [&]()
-    {
-        if (bSkipOutput)
-            return;
-
-        // output
-        {
-            GLOW_SCOPED(debugGroup, "output");
-            auto shader = mShaderOutput->use();
-            shader["uTexOutput"] = subViewData.targetOutput;
-            shader["uAccumCnt"] = subViewData.accumCount;
-            shader["uViewportOffset"] = offset;
-            shader["uDebugPixels"] = scene.enableScreenshotDebug;
-            mMeshQuad->bind().draw();
-        }
-
-        // glow-extras-vector overlay
+    auto renderVectorOverlay = [&]()
     {
         RenderInfo info{cam.computeViewMatrix(),
             cam.computeProjMatrix(),
@@ -401,7 +385,26 @@ void glow::viewer::ViewerRenderer::renderSubview(
             }
         }
         mVectorRenderer.render(mVectorImage, res.width, res.height);
+    };
+
+    auto performOutput = [&]()
+    {
+        if (bSkipOutput)
+            return;
+
+        // output
+        {
+            GLOW_SCOPED(debugGroup, "output");
+            auto shader = mShaderOutput->use();
+            shader["uTexOutput"] = subViewData.targetOutput;
+            shader["uAccumCnt"] = subViewData.accumCount;
+            shader["uViewportOffset"] = offset;
+            shader["uDebugPixels"] = scene.enableScreenshotDebug;
+            mMeshQuad->bind().draw();
         }
+
+        // glow-extras-vector overlay
+        renderVectorOverlay();
     };
 
     // allocate pool targets
@@ -852,5 +855,12 @@ void glow::viewer::ViewerRenderer::renderSubview(
         ++subViewData.accumCount;
     }
 
+    if (bSkipOutput && subViewData.targetOutput2D)
+    {
+        auto fb = mFramebufferOutput->bind();
+        fb.attachColor("fOutput", subViewData.targetOutput2D);
+        renderVectorOverlay();
+    }
+
     performOutput();
 }