Example 14 ComputeScan fix for new NBL API and use HLSL #113
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| auto minSSBOAlign = m_physicalDevice->getLimits().minSSBOAlignment; | ||
| constexpr auto begin = in_count / 4 + 118; | ||
| assert(((begin * sizeof(uint32_t)) & (minSSBOAlign - 1u)) == 0u); | ||
| constexpr auto end = in_count * 3 / 4 - 78; | ||
| assert(((end * sizeof(uint32_t)) & (minSSBOAlign - 1u)) == 0u); | ||
| constexpr auto elementCount = end - begin; |
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what's the point of all this?
| { | ||
| IGPUBuffer::SCreationParams inputDataBufferCreationParams = {}; | ||
| inputDataBufferCreationParams.size = sizeof(uint32_t) * in_count; // TODO Declare the element data type in the shader? | ||
| inputDataBufferCreationParams.usage = IGPUBuffer::EUF_STORAGE_BUFFER_BIT | IGPUBuffer::EUF_TRANSFER_SRC_BIT | IGPUBuffer::EUF_TRANSFER_DST_BIT; |
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address usage, if you want to use BDA
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| CArithmeticOps::DispatchInfo reduce_dispatch_info; | ||
| reducer->buildParameters(elementCount, reduce_push_constants, reduce_dispatch_info); |
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I think I've left a comment in the "mother PR" that this should be a constructor of parameters or something
Kinda silly to have to use a factory to do some basic arithmetic
14_ComputeReduce/main.cpp
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| // (REVIEW): Check if this new download_buffer is needed or if we can directly read from the gpu_input buffer | ||
| auto downloaded_buffer = m_device->createBuffer(std::move(params)); | ||
| auto memReqs = downloaded_buffer->getMemoryReqs(); | ||
| memReqs.memoryTypeBits &= m_physicalDevice->getDownStreamingMemoryTypeBits(); | ||
| auto queriesMem = m_device->allocate(memReqs, downloaded_buffer.get()); |
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use the downstreaming buffer and make a consumption callback.
Otherwise you'll have a problem making a 128MB HOST_VISIBLE and DEVICE_LOCAL buffer, not everyone has ReBAR configured correctly.
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See example 05 (whichever does the streaming consumer callback), how to download a buffer and consume it "piecewise"
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Still doesn't work. There are shader issues with shared memory reading. The basic outline is correct however.