Function TestAliasing

src/Tests.cpp:6903–6982

}

static void TestAliasing()
{
    wprintf(L"Testing aliasing...\n");

    /*
    This is just a simple test, more like a code sample to demonstrate it's possible.
    */

    // A 512x512 texture to be sampled.
    VkImageCreateInfo img1CreateInfo = { VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO };
    img1CreateInfo.imageType = VK_IMAGE_TYPE_2D;
    img1CreateInfo.extent.width = 512;
    img1CreateInfo.extent.height = 512;
    img1CreateInfo.extent.depth = 1;
    img1CreateInfo.mipLevels = 10;
    img1CreateInfo.arrayLayers = 1;
    img1CreateInfo.format = VK_FORMAT_R8G8B8A8_SRGB;
    img1CreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
    img1CreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
    img1CreateInfo.usage = VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT;
    img1CreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;

    // A full screen texture to be used as color attachment.
    VkImageCreateInfo img2CreateInfo = { VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO };
    img2CreateInfo.imageType = VK_IMAGE_TYPE_2D;
    img2CreateInfo.extent.width = 1920;
    img2CreateInfo.extent.height = 1080;
    img2CreateInfo.extent.depth = 1;
    img2CreateInfo.mipLevels = 1;
    img2CreateInfo.arrayLayers = 1;
    img2CreateInfo.format = VK_FORMAT_R8G8B8A8_UNORM;
    img2CreateInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
    img2CreateInfo.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
    img2CreateInfo.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
    img2CreateInfo.samples = VK_SAMPLE_COUNT_1_BIT;

    VkImage img1 = VK_NULL_HANDLE;
    ERR_GUARD_VULKAN(vkCreateImage(g_hDevice, &img1CreateInfo, g_Allocs, &img1));
    VkImage img2 = VK_NULL_HANDLE;
    ERR_GUARD_VULKAN(vkCreateImage(g_hDevice, &img2CreateInfo, g_Allocs, &img2));

    VkMemoryRequirements img1MemReq = {};
    vkGetImageMemoryRequirements(g_hDevice, img1, &img1MemReq);
    VkMemoryRequirements img2MemReq = {};
    vkGetImageMemoryRequirements(g_hDevice, img2, &img2MemReq);

    VkMemoryRequirements finalMemReq = {};
    finalMemReq.size = std::max(img1MemReq.size, img2MemReq.size);
    finalMemReq.alignment = std::max(img1MemReq.alignment, img2MemReq.alignment);
    finalMemReq.memoryTypeBits = img1MemReq.memoryTypeBits & img2MemReq.memoryTypeBits;
    if(finalMemReq.memoryTypeBits != 0)
    {
        wprintf(L"  size: max(%llu, %llu) = %llu\n",
            img1MemReq.size, img2MemReq.size, finalMemReq.size);
        wprintf(L"  alignment: max(%llu, %llu) = %llu\n",
            img1MemReq.alignment, img2MemReq.alignment, finalMemReq.alignment);
        wprintf(L"  memoryTypeBits: %u & %u = %u\n",
            img1MemReq.memoryTypeBits, img2MemReq.memoryTypeBits, finalMemReq.memoryTypeBits);