src/dawn/native/vulkan/CommandRecordingContextVk.cpp

// Copyright 2019 The Dawn & Tint Authors
//
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#include "src/dawn/native/vulkan/CommandRecordingContextVk.h"

#include "dawn/native/vulkan/DeviceVk.h"
#include "vulkan/vulkan_core.h"

namespace dawn::native::vulkan {
namespace {

// Separate barriers with vertex stages in destination stages from all other barriers.
// This avoids creating unnecessary fragment->vertex dependencies when merging barriers.
// Eg. merging a compute->vertex barrier and a fragment->fragment barrier would create
// a compute|fragment->vertex|fragment barrier.
constexpr VkPipelineStageFlags vertexStages = VK_PIPELINE_STAGE_VERTEX_INPUT_BIT |
                                              VK_PIPELINE_STAGE_VERTEX_SHADER_BIT |
                                              VK_PIPELINE_STAGE_DRAW_INDIRECT_BIT;

}  // namespace

void CommandRecordingContext::AddBufferBarrier(VkAccessFlags srcAccessMask,
                                               VkAccessFlags dstAccessMask,
                                               VkPipelineStageFlags srcStages,
                                               VkPipelineStageFlags dstStages) {
    BufferBarrier* barrier = nullptr;
    if (dstStages & vertexStages) {
        barrier = &mVertexBufferBarrier;
    } else {
        barrier = &mNonVertexBufferBarrier;
    }

    barrier->bufferSrcAccessMask |= srcAccessMask;
    barrier->bufferDstAccessMask |= dstAccessMask;
    barrier->bufferSrcStages |= srcStages;
    barrier->bufferDstStages |= dstStages;
}

void CommandRecordingContext::EmitBufferBarriers(Device* device) {
    std::array<VkMemoryBarrier, 2> barriers;
    size_t idx = 0;

    VkPipelineStageFlags srcStages = 0;
    VkPipelineStageFlags dstStages = 0;

    auto CreateBarrierIfNeeded = [&](const BufferBarrier& barrier) {
        if (barrier.bufferSrcStages == 0 || barrier.bufferDstStages == 0) {
            return;
        }

        barriers[idx].sType = VK_STRUCTURE_TYPE_MEMORY_BARRIER;
        barriers[idx].pNext = nullptr;
        barriers[idx].srcAccessMask = barrier.bufferSrcAccessMask;
        barriers[idx].dstAccessMask = barrier.bufferDstAccessMask;

        srcStages |= barrier.bufferSrcStages;
        dstStages |= barrier.bufferDstStages;

        idx++;
    };
    CreateBarrierIfNeeded(mVertexBufferBarrier);
    CreateBarrierIfNeeded(mNonVertexBufferBarrier);

    if (idx > 0) {
        device->fn.CmdPipelineBarrier(commandBuffer, srcStages, dstStages, 0, idx, barriers.data(),
                                      0, nullptr, 0, nullptr);
    }

    mVertexBufferBarrier = {};
    mNonVertexBufferBarrier = {};
}

}  // namespace dawn::native::vulkan