Shadow task now uses LOD culling from main view task

interface/src/SecondaryCamera.cpp

@@ -19,7 +19,7 @@
 using RenderArgsPointer = std::shared_ptr<RenderArgs>;
 
 void MainRenderTask::build(JobModel& task, const render::Varying& inputs, render::Varying& outputs, render::CullFunctor cullFunctor, bool isDeferred) {    
-    task.addJob<RenderShadowTask>("RenderShadowTask", render::ItemKey::TAG_BITS_1, render::ItemKey::TAG_BITS_1);
+    task.addJob<RenderShadowTask>("RenderShadowTask", cullFunctor, render::ItemKey::TAG_BITS_1, render::ItemKey::TAG_BITS_1);
     const auto items = task.addJob<RenderFetchCullSortTask>("FetchCullSort", cullFunctor, render::ItemKey::TAG_BITS_1, render::ItemKey::TAG_BITS_1);
     assert(items.canCast<RenderFetchCullSortTask::Output>());
     if (!isDeferred) {

libraries/render-utils/src/RenderShadowTask.cpp

@@ -200,8 +200,8 @@ void RenderShadowMap::run(const render::RenderContextPointer& renderContext, con
     });
 }
 
-void RenderShadowTask::build(JobModel& task, const render::Varying& input, render::Varying& output, uint8_t tagBits, uint8_t tagMask) {
-    ::CullFunctor cullFunctor = [this](const RenderArgs* args, const AABox& bounds) {
+void RenderShadowTask::build(JobModel& task, const render::Varying& input, render::Varying& output, render::CullFunctor cameraCullFunctor, uint8_t tagBits, uint8_t tagMask) {
+    ::CullFunctor shadowCullFunctor = [this](const RenderArgs* args, const AABox& bounds) {
         return _cullFunctor(args, bounds);
     };
 
@@ -224,8 +224,14 @@ void RenderShadowTask::build(JobModel& task, const render::Varying& input, rende
     const auto selectionInputs = FetchSpatialSelection::Inputs(shadowSelection, shadowCasterFilter).asVarying();
     const auto shadowItems = task.addJob<FetchSpatialSelection>("FetchShadowSelection", selectionInputs);
 
+    // Cull objects that are not visible in camera view. Hopefully the cull functor only performs LOD culling, not
+    // frustum culling or this will make shadow casters out of the camera frustum disappear.
+    const auto cameraFrustum = setupOutput.getN<RenderShadowSetup::Outputs>(2);
+    const auto applyFunctorInputs = ApplyCullFunctorOnItemBounds::Inputs(shadowItems, cameraFrustum).asVarying();
+    const auto culledShadowItems = task.addJob<ApplyCullFunctorOnItemBounds>("ShadowCullCamera", applyFunctorInputs, cameraCullFunctor);
+
     // Sort
-    const auto sortedPipelines = task.addJob<PipelineSortShapes>("PipelineSortShadow", shadowItems);
+    const auto sortedPipelines = task.addJob<PipelineSortShapes>("PipelineSortShadow", culledShadowItems);
     const auto sortedShapes = task.addJob<DepthSortShapes>("DepthSortShadow", sortedPipelines, true);
 
     render::Varying cascadeFrustums[SHADOW_CASCADE_MAX_COUNT] = {
@@ -248,7 +254,7 @@ void RenderShadowTask::build(JobModel& task, const render::Varying& input, rende
 
         // CPU jobs: finer grained culling
         const auto cullInputs = CullShapeBounds::Inputs(sortedShapes, shadowFilter, antiFrustum).asVarying();
-        const auto culledShadowItemsAndBounds = task.addJob<CullShapeBounds>("CullShadowCascade", cullInputs, cullFunctor, RenderDetails::SHADOW);
+        const auto culledShadowItemsAndBounds = task.addJob<CullShapeBounds>("CullShadowCascade", cullInputs, shadowCullFunctor, RenderDetails::SHADOW);
 
         // GPU jobs: Render to shadow map
         sprintf(jobName, "RenderShadowMap%d", i);
@@ -266,6 +272,7 @@ void RenderShadowTask::configure(const Config& configuration) {
 }
 
 RenderShadowSetup::RenderShadowSetup() :
+    _cameraFrustum{ std::make_shared<ViewFrustum>() },
     _coarseShadowFrustum{ std::make_shared<ViewFrustum>() } {
 
 }
@@ -297,6 +304,9 @@ void RenderShadowSetup::run(const render::RenderContextPointer& renderContext, O
 
     output.edit0() = args->_renderMode;
     output.edit1() = glm::ivec2(0, 0);
+    // Save main camera frustum
+    *_cameraFrustum = args->getViewFrustum();
+    output.edit2() = _cameraFrustum;
 
     const auto globalShadow = lightStage->getCurrentKeyShadow();
     if (globalShadow) {

libraries/render-utils/src/RenderShadowTask.h

@@ -50,7 +50,7 @@ public:
     using JobModel = render::Task::Model<RenderShadowTask, Config>;
 
     RenderShadowTask() {}
-    void build(JobModel& task, const render::Varying& inputs, render::Varying& outputs, uint8_t tagBits = 0x00, uint8_t tagMask = 0x00);
+    void build(JobModel& task, const render::Varying& inputs, render::Varying& outputs, render::CullFunctor cameraCullFunctor, uint8_t tagBits = 0x00, uint8_t tagMask = 0x00);
 
     void configure(const Config& configuration);
 
@@ -95,7 +95,7 @@ signals:
 
 class RenderShadowSetup {
 public:
-    using Outputs = render::VaryingSet2<RenderArgs::RenderMode, glm::ivec2>;
+    using Outputs = render::VaryingSet3<RenderArgs::RenderMode, glm::ivec2, ViewFrustumPointer>;
     using Config = RenderShadowSetupConfig;
     using JobModel = render::Job::ModelO<RenderShadowSetup, Outputs, Config>;
 
@@ -105,6 +105,7 @@ public:
 
 private:
 
+    ViewFrustumPointer _cameraFrustum;
     ViewFrustumPointer _coarseShadowFrustum;
     struct {
         float _constant;

libraries/render-utils/src/RenderViewTask.cpp

@@ -17,7 +17,9 @@
 void RenderViewTask::build(JobModel& task, const render::Varying& input, render::Varying& output, render::CullFunctor cullFunctor, bool isDeferred, uint8_t tagBits, uint8_t tagMask) {
    // auto items = input.get<Input>();
 
-    task.addJob<RenderShadowTask>("RenderShadowTask", tagBits, tagMask);
+    // Warning : the cull functor passed to the shadow pass should only be testing for LOD culling. If frustum culling
+    // is performed, then casters not in the view frustum will be removed, which is not what we wish.
+    task.addJob<RenderShadowTask>("RenderShadowTask", cullFunctor, tagBits, tagMask);
 
     const auto items = task.addJob<RenderFetchCullSortTask>("FetchCullSort", cullFunctor, tagBits, tagMask);
     assert(items.canCast<RenderFetchCullSortTask::Output>());

libraries/render/src/render/CullTask.cpp

@@ -389,6 +389,32 @@ void CullShapeBounds::run(const RenderContextPointer& renderContext, const Input
     }
 }
 
+void ApplyCullFunctorOnItemBounds::run(const RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs) {
+    assert(renderContext->args);
+    assert(renderContext->args->hasViewFrustum());
+    RenderArgs* args = renderContext->args;
+    auto& inItems = inputs.get0();
+    auto& outItems = outputs;
+    auto inputFrustum = inputs.get1();
+
+    if (inputFrustum != nullptr) {
+        args->pushViewFrustum(*inputFrustum);
+    }
+
+    outItems.clear();
+    outItems.reserve(inItems.size());
+
+    for (auto& item : inItems) {
+        if (_cullFunctor(args, item.bound)) {
+            outItems.emplace_back(item);
+        }
+    }
+
+    if (inputFrustum != nullptr) {
+        args->popViewFrustum();
+    }
+}
+
 void FetchSpatialSelection::run(const RenderContextPointer& renderContext,
                                const Inputs& inputs, ItemBounds& outItems) {
     assert(renderContext->args);

libraries/render/src/render/CullTask.h

@@ -140,6 +140,19 @@ namespace render {
         void run(const RenderContextPointer& renderContext, const Inputs& inputs, ItemBounds& outItems);
     };
 
+    class ApplyCullFunctorOnItemBounds {
+    public:
+        using Inputs = render::VaryingSet2<ItemBounds, ViewFrustumPointer>;
+        using Outputs = ItemBounds;
+        using JobModel = Job::ModelIO<ApplyCullFunctorOnItemBounds, Inputs, Outputs>;
+
+        ApplyCullFunctorOnItemBounds(render::CullFunctor cullFunctor) : _cullFunctor(cullFunctor) {}
+        void run(const RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs);
+
+    private:
+
+        render::CullFunctor _cullFunctor;
+    };
 }
 
 #endif // hifi_render_CullTask_h;