VulkanSequence.cpp

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#include "gpgpu/vulkan/VulkanSequence.h"
#include "gpgpu/vulkan/VulkanComputeShader.h"
#include "gpgpu/vulkan/VulkanGpuBuffer.h"
#include "gpgpu/vulkan/VulkanUtil.h"
 
#include "common/Exception.h"
#include "graphics/vulkan/Graphics.h"
 
#include <algorithm>
 
namespace eve::gpgpu {
 
bool VulkanSequence::ready() const { return vkg && static_cast<VkDevice>(vkg->getDevice().instance); }
 
namespace {
 
using buf = vk::BufferUsageFlagBits;
using pfb = vk::MemoryPropertyFlagBits;
 
void fullMemoryBarrier(VulkanSequence *seq) {
    vk::MemoryBarrier mb{vk::AccessFlagBits::eMemoryWrite | vk::AccessFlagBits::eMemoryRead,
                         vk::AccessFlagBits::eMemoryRead | vk::AccessFlagBits::eMemoryWrite};
    seq->commandBuffer.pipelineBarrier(vk::PipelineStageFlagBits::eAllCommands,
                                       vk::PipelineStageFlagBits::eAllCommands,
                                       vk::DependencyFlags{}, 1, &mb, 0, nullptr, 0, nullptr);
}
 
}  // namespace
 
VulkanSequence *vulkanSequenceCreate() { return new VulkanSequence(); }
 
void VulkanSequence::ensureReady() {
    if (ready()) return;
    auto *g = requireVulkanGraphics();
    vkg = g;
    queue = computeQueue(g);
    pool = computeCommandPool(g);
    if (!queue) throw Exception("Gpgpu.Sequence: no compute/graphics queue");
}
 
void VulkanSequence::ensureCommandBuffer() {
    if (recording && commandBuffer) return;
    ensureReady();
    auto &device = vkg->getDevice();
    if (!fenceReady) {
        fence = device->createFence(vk::FenceCreateInfo{});
        fenceReady = true;
    }
    vk::CommandBufferAllocateInfo cbai{pool, vk::CommandBufferLevel::ePrimary, 1};
    commandBuffer = device->allocateCommandBuffers(cbai)[0];
    commandBuffer.begin(vk::CommandBufferBeginInfo{});
    recording = true;
    stagingUsed = 0;
    usedShaders.clear();
}
 
void VulkanSequence::destroy() {
    auto *dev = vkg ? &vkg->getDevice() : nullptr;
    if (dev && static_cast<VkDevice>(dev->instance)) {
        if (commandBuffer) {
            (*dev)->freeCommandBuffers(pool, commandBuffer);
            commandBuffer = vk::CommandBuffer{};
        }
        if (fenceReady) {
            (*dev)->destroyFence(fence, dev->allocation_callbacks);
            fence = nullptr;
            fenceReady = false;
        }
    }
    recording = false;
    stagingPool.clear();
    vkg = nullptr;
    queue = vk::Queue{};
    pool = vk::CommandPool{};
}
 
void vulkanSequenceDestroy(VulkanSequence *seq) {
    if (!seq) return;
    seq->destroy();
    delete seq;
}
 
void vulkanSequenceBegin(VulkanSequence *seq) {
    if (!seq) throw Exception("Gpgpu.Sequence: null sequence");
    seq->ensureReady();
    seq->ensureCommandBuffer();
    seq->stagingUsed = 0;
}
 
void vulkanSequenceRecordUpload(VulkanSequence *seq, GpuBuffer *dst,
                                const void *src, uint64_t nbytes,
                                uint64_t dstOffset) {
    if (!seq || !dst || !src || nbytes == 0) return;
    seq->ensureCommandBuffer();
    auto *vkbDst = dynamic_cast<VulkanGpuBuffer *>(dst);
    if (!vkbDst || !vkbDst->buffer_)
        throw Exception("Gpgpu.Sequence.recordUpload: destination is not a Vulkan storage buffer");
    if (dstOffset + nbytes > uint64_t(vkbDst->size_))
        throw Exception("Gpgpu.Sequence.recordUpload: out of range");
 
    auto &device = seq->vkg->getDevice();
    vkb::GenericBuffer *staging = nullptr;
    for (size_t i = seq->stagingUsed; i < seq->stagingPool.size(); ++i) {
        if (seq->stagingPool[i].capacity >= vk::DeviceSize(nbytes)) {
            staging = &seq->stagingPool[i];
            std::swap(seq->stagingPool[seq->stagingUsed], seq->stagingPool[i]);
            break;
        }
    }
    if (!staging) {
        seq->stagingPool.emplace_back(device, buf::eTransferSrc, vk::DeviceSize(nbytes),
                                      pfb::eHostVisible | pfb::eHostCoherent);
        staging = &seq->stagingPool.back();
    }
    ++seq->stagingUsed;
    staging->updateLocal(vkb::FrameSlot::gpuIdle(), src, vk::DeviceSize(nbytes));
 
    vk::BufferCopy bc{0, vk::DeviceSize(dstOffset), vk::DeviceSize(nbytes)};
    seq->commandBuffer.copyBuffer(staging->buffer, vkbDst->buffer_, bc);
    fullMemoryBarrier(seq);
}
 
void vulkanSequenceRecordDownload(VulkanSequence *seq, GpuBuffer *src,
                                  GpuBuffer *staging, uint64_t nbytes,
                                  uint64_t srcOffset) {
    if (!seq || !src || !staging || nbytes == 0) return;
    seq->ensureCommandBuffer();
    auto *vkbSrc = dynamic_cast<VulkanGpuBuffer *>(src);
    auto *vkbStaging = dynamic_cast<VulkanGpuBuffer *>(staging);
    if (!vkbSrc || !vkbSrc->buffer_)
        throw Exception("Gpgpu.Sequence.recordDownload: source is not a Vulkan storage buffer");
    if (!vkbStaging || !vkbStaging->buffer_ || !vkbStaging->hostVisible_)
        throw Exception("Gpgpu.Sequence.recordDownload: target must be a \"staging\" buffer");
    if (srcOffset + nbytes > uint64_t(vkbSrc->size_))
        throw Exception("Gpgpu.Sequence.recordDownload: out of range");
    if (nbytes > uint64_t(vkbStaging->size_))
        throw Exception("Gpgpu.Sequence.recordDownload: staging buffer too small");
 
    vk::BufferCopy bc{vk::DeviceSize(srcOffset), 0, vk::DeviceSize(nbytes)};
    seq->commandBuffer.copyBuffer(vkbSrc->buffer_, vkbStaging->buffer_, bc);
    fullMemoryBarrier(seq);
}
 
void vulkanSequenceRecordDispatch(VulkanSequence *seq, ComputeShader *shader,
                                  int groupsX, int groupsY, int groupsZ) {
    if (!seq || !shader) return;
    seq->ensureCommandBuffer();
    auto *vs = dynamic_cast<VulkanComputeShader *>(shader);
    if (!vs || !vs->pipeline_) return;
    if (groupsX <= 0) groupsX = 1;
    if (groupsY <= 0) groupsY = 1;
    if (groupsZ <= 0) groupsZ = 1;
 
    auto &device = seq->vkg->getDevice();
    vs->beginSequence();
    vs->flushDescriptors(device);
    if (std::find(seq->usedShaders.begin(), seq->usedShaders.end(), vs) ==
        seq->usedShaders.end())
        seq->usedShaders.push_back(vs);
 
    seq->commandBuffer.bindPipeline(vk::PipelineBindPoint::eCompute, vs->pipeline_);
    if (vs->descriptorSet_) {
        seq->commandBuffer.bindDescriptorSets(vk::PipelineBindPoint::eCompute,
                                              vs->pipelineLayout_, 0, vs->descriptorSet_,
                                              nullptr);
    }
    seq->commandBuffer.pushConstants(vs->pipelineLayout_, vk::ShaderStageFlagBits::eCompute,
                                     0, ComputeShader::kPushConstantBytes,
                                     vs->pushConstantData());
    seq->commandBuffer.dispatch(uint32_t(groupsX), uint32_t(groupsY), uint32_t(groupsZ));
    fullMemoryBarrier(seq);
}
 
void vulkanSequenceSubmit(VulkanSequence *seq) {
    if (!seq) return;
    seq->ensureReady();
    if (!seq->recording || !seq->commandBuffer)
        throw Exception("Gpgpu.Sequence.submit: nothing recorded");
    auto &device = seq->vkg->getDevice();
 
    vk::CommandBuffer cb = seq->commandBuffer;
    seq->commandBuffer = vk::CommandBuffer{};
    seq->recording = false;
    cb.end();
 
    device->resetFences(seq->fence);
    vk::SubmitInfo submit;
    submit.commandBufferCount = 1;
    submit.pCommandBuffers = &cb;
    seq->queue.submit(submit, seq->fence);
    (void)device->waitForFences(1, &seq->fence, VK_TRUE, UINT64_MAX);
    for (ComputeShader *shader : seq->usedShaders) {
        auto *vs = dynamic_cast<VulkanComputeShader *>(shader);
        if (vs) {
            vs->endSequence();
            vs->releasePendingDescriptors(device);
        }
    }
    device->freeCommandBuffers(seq->pool, cb);
}
 
}  // namespace eve::gpgpu