Function findViewCommon

Source/Falcor/Core/API/Texture.cpp:444–500

template<typename ViewClass, typename ViewMapType>
ref<ViewClass> findViewCommon(
    Texture* pTexture,
    uint32_t mostDetailedMip,
    uint32_t mipCount,
    uint32_t firstArraySlice,
    uint32_t arraySize,
    ViewMapType& viewMap,
    CreateFuncType<ViewClass> createFunc
)
{
    uint32_t resMipCount = 1;
    uint32_t resArraySize = 1;

    resArraySize = pTexture->getArraySize();
    resMipCount = pTexture->getMipCount();

    if (firstArraySlice >= resArraySize)
    {
        logWarning("First array slice is OOB when creating resource view. Clamping");
        firstArraySlice = resArraySize - 1;
    }

    if (mostDetailedMip >= resMipCount)
    {
        logWarning("Most detailed mip is OOB when creating resource view. Clamping");
        mostDetailedMip = resMipCount - 1;
    }

    if (mipCount == Resource::kMaxPossible)
    {
        mipCount = resMipCount - mostDetailedMip;
    }
    else if (mipCount + mostDetailedMip > resMipCount)
    {
        logWarning("Mip count is OOB when creating resource view. Clamping");
        mipCount = resMipCount - mostDetailedMip;
    }

    if (arraySize == Resource::kMaxPossible)
    {
        arraySize = resArraySize - firstArraySlice;
    }
    else if (arraySize + firstArraySlice > resArraySize)
    {
        logWarning("Array size is OOB when creating resource view. Clamping");
        arraySize = resArraySize - firstArraySlice;
    }

    ResourceViewInfo view = ResourceViewInfo(mostDetailedMip, mipCount, firstArraySlice, arraySize);

    if (viewMap.find(view) == viewMap.end())
    {
        viewMap[view] = createFunc(pTexture, mostDetailedMip, mipCount, firstArraySlice, arraySize);
    }

    return viewMap[view];
}