Function TestMappingHysteresis

src/Tests.cpp:8467–8632

}

static void TestMappingHysteresis()
{
    /*
    We have no way to check here if hysteresis worked as expected,
    but at least we provoke some cases and make sure it doesn't crash or assert.
    You can always check details with the debugger.
    */

    wprintf(L"Test mapping hysteresis\n");

    VkBufferCreateInfo bufCreateInfo = {VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO};
    bufCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
    bufCreateInfo.size = 0x10000;

    VmaAllocationCreateInfo templateAllocCreateInfo = {};
    templateAllocCreateInfo.usage = VMA_MEMORY_USAGE_AUTO;
    templateAllocCreateInfo.flags = VMA_ALLOCATION_CREATE_HOST_ACCESS_SEQUENTIAL_WRITE_BIT;

    VmaPoolCreateInfo poolCreateInfo = {};
    poolCreateInfo.blockSize = 10 * MEGABYTE;
    poolCreateInfo.minBlockCount = poolCreateInfo.maxBlockCount = 1;
    TEST(vmaFindMemoryTypeIndexForBufferInfo(g_hAllocator,
        &bufCreateInfo, &templateAllocCreateInfo, &poolCreateInfo.memoryTypeIndex) == VK_SUCCESS);

    constexpr uint32_t BUF_COUNT = 30;
    bool endOfScenarios = false;
    for(uint32_t scenarioIndex = 0; !endOfScenarios; ++scenarioIndex)
    {
        VmaPool pool;
        TEST(vmaCreatePool(g_hAllocator, &poolCreateInfo, &pool) == VK_SUCCESS);

        BufferInfo buf;
        VmaAllocationInfo allocInfo;

        std::vector<BufferInfo> bufs;

        // Scenario: Create + destroy buffers without mapping. Hysteresis should not launch.
        if(scenarioIndex == 0)
        {
            VmaAllocationCreateInfo allocCreateInfo = {};
            allocCreateInfo.pool = pool;

            for(uint32_t bufIndex = 0; bufIndex < BUF_COUNT; ++bufIndex)
            {
                TEST(vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo, &buf.Buffer, &buf.Allocation, &allocInfo) == VK_SUCCESS);
                TEST(allocInfo.pMappedData == nullptr);
                vmaDestroyBuffer(g_hAllocator, buf.Buffer, buf.Allocation);
            }
        }
        // Scenario:
        // - Create one buffer mapped that stays there.
        // - Create + destroy mapped buffers back and forth. Hysteresis should launch.
        else if(scenarioIndex == 1)
        {
            VmaAllocationCreateInfo allocCreateInfo = {};
            allocCreateInfo.pool = pool;
            allocCreateInfo.flags = VMA_ALLOCATION_CREATE_MAPPED_BIT;