Method updateDisplacement

Source/Falcor/Scene/Scene.cpp:1048–1122

    }

    IScene::UpdateFlags Scene::updateDisplacement(RenderContext* pRenderContext, bool forceUpdate)
    {
        if (!hasGeometryType(GeometryType::DisplacedTriangleMesh)) return IScene::UpdateFlags::None;

        // For now we assume that displaced meshes are static.
        // Create AABB and AABB update task buffers.
        if (!mDisplacement.pAABBBuffer)
        {
            mDisplacement.meshData.resize(mMeshDesc.size());
            mDisplacement.updateTasks.clear();

            uint32_t AABBOffset = 0;

            for (uint32_t meshID = 0; meshID < mMeshDesc.size(); ++meshID)
            {
                const auto& mesh = mMeshDesc[meshID];

                if (!mesh.isDisplaced())
                {
                    mDisplacement.meshData[meshID] = {};
                    continue;
                }

                uint32_t AABBCount = mesh.getTriangleCount();
                mDisplacement.meshData[meshID] = { AABBOffset, AABBCount };
                AABBOffset += AABBCount;

                DisplacementUpdateTask task;
                task.meshID = meshID;
                task.triangleIndex = 0;
                task.AABBIndex = mDisplacement.meshData[meshID].AABBOffset;
                task.count = mDisplacement.meshData[meshID].AABBCount;
                mDisplacement.updateTasks.push_back(task);
            }

            mDisplacement.pAABBBuffer = mpDevice->createStructuredBuffer(sizeof(RtAABB), AABBOffset, ResourceBindFlags::ShaderResource | ResourceBindFlags::UnorderedAccess);

            FALCOR_ASSERT(mDisplacement.updateTasks.size() < std::numeric_limits<uint32_t>::max());
            mDisplacement.pUpdateTasksBuffer = mpDevice->createStructuredBuffer((uint32_t)sizeof(DisplacementUpdateTask), (uint32_t)mDisplacement.updateTasks.size(), ResourceBindFlags::ShaderResource, MemoryType::DeviceLocal, mDisplacement.updateTasks.data());
        }

        FALCOR_ASSERT(!mDisplacement.updateTasks.empty());

        // We cannot access the scene parameter block until its finalized.
        if (!mFinalized) return IScene::UpdateFlags::None;

        // Update the AABB data.
        if (!mDisplacement.pUpdatePass)
        {
            mDisplacement.pUpdatePass = ComputePass::create(mpDevice, "Scene/Displacement/DisplacementUpdate.cs.slang", "main", getSceneDefines());
            mDisplacement.needsUpdate = true;
        }

        if (mDisplacement.needsUpdate)
        {
            // TODO: Only update objects with modified materials.

            FALCOR_PROFILE(pRenderContext, "updateDisplacement");