The culprit of issue #411 was that the LUT state was completely uninitialized.

Author: devshgraphicsprogramming

include/nbl/asset/filters/CMipMapGenerationImageFilter.h

@@ -123,7 +123,7 @@ class CMipMapGenerationImageFilter : public CImageFilter<CMipMapGenerationImageF
 			//blit.kernel = Kernel(); // gets default constructed, we should probably do a `static_assert` about this property
 			static_cast<state_base_t&>(blit) = *static_cast<const state_base_t*>(state);
 
-			pseudo_base_t::blit_utils_t::computeScaledKernelPhasedLUT(blit.scratchMemory + pseudo_base_t::getScratchOffset(&blit, pseudo_base_t::ESU_SCALED_KERNEL_PHASED_LUT), blit.inExtentLayerCount, blit.outExtentLayerCount, blit.inImage->getCreationParameters().type, blit.kernelX, blit.kernelY, blit.kernelZ);
+			blit.recomputeScaledKernelPhasedLUT();
 			return blit;
 		}
 };

src/nbl/asset/utils/CDerivativeMapCreator.cpp

@@ -187,6 +187,7 @@ core::smart_refctd_ptr<ICPUImage> CDerivativeMapCreator::createDerivativeMapFrom
 	state.scratchMemoryByteSize = DerivativeMapFilter::getRequiredScratchByteSize(&state);
 	state.scratchMemory = reinterpret_cast<uint8_t*>(_NBL_ALIGNED_MALLOC(state.scratchMemoryByteSize, _NBL_SIMD_ALIGNMENT));
 
+	state.recomputeScaledKernelPhasedLUT();
 	const bool result = DerivativeMapFilter::execute(core::execution::par_unseq,&state);
 	if (result)
 	{