Method Map

include/vk_mem_alloc.h:11090–11130

}

VkResult VmaDeviceMemoryBlock::Map(VmaAllocator hAllocator, uint32_t count, void** ppData)
{
    if (count == 0)
    {
        return VK_SUCCESS;
    }

    VmaMutexLock lock(m_MapAndBindMutex, hAllocator->m_UseMutex);
    const uint32_t oldTotalMapCount = m_MapCount + m_MappingHysteresis.GetExtraMapping();
    if (oldTotalMapCount != 0)
    {
        VMA_ASSERT(m_pMappedData != VMA_NULL);
        m_MappingHysteresis.PostMap();
        m_MapCount += count;
        if (ppData != VMA_NULL)
        {
            *ppData = m_pMappedData;
        }
        return VK_SUCCESS;
    }

    VkResult result = (*hAllocator->GetVulkanFunctions().vkMapMemory)(
        hAllocator->m_hDevice,
        m_hMemory,
        0, // offset
        VK_WHOLE_SIZE,
        0, // flags
        &m_pMappedData);
    if (result == VK_SUCCESS)
    {
        VMA_ASSERT(m_pMappedData != VMA_NULL);
        m_IsMapped.store(true);
        m_MappingHysteresis.PostMap();
        m_MapCount = count;
        if (ppData != VMA_NULL)
        {
            *ppData = m_pMappedData;
        }
    }
    return result;
}

void VmaDeviceMemoryBlock::Unmap(VmaAllocator hAllocator, uint32_t count)
{