Method fetchCount

Source/Falcor/Scene/SDFs/SparseBrickSet/SDFSBS.cpp:1010–1025

    }

    uint32_t SDFSBS::fetchCount(RenderContext* pRenderContext, const ref<Buffer>& pBuffer)
    {
        if (!mpCountStagingBuffer)
        {
            mpCountStagingBuffer = mpDevice->createBuffer(4, ResourceBindFlags::None, MemoryType::ReadBack);
        }

        // Copy result to staging buffer.
        pRenderContext->copyBufferRegion(mpCountStagingBuffer.get(), 0, pBuffer.get(), 0, 4);
        pRenderContext->submit(true);

        // Read back final results.
        uint32_t finalResults = *reinterpret_cast<uint32_t*>(mpCountStagingBuffer->map());
        mpCountStagingBuffer->unmap();
        return finalResults;
    }

    void SDFSBS::compactifyChunks(RenderContext* pRenderContext, uint32_t chunkCount)
    {