Trouble loading sample data in SlicerAutoscoperM

jcfr · February 6, 2025, 3:32pm

@Lauren_Welte do you happen to have two video cards on your system ?

Since issues happen with both backend, we need to first confirm there are two video card and then ensure the NVIDIA one is used.

CUDA Backend

Based on the screenshot shared above ^[1], the code triggering the error when using the CUDA backend can be inspected here (line 400):

github.com/BrownBiomechanics/Autoscoper

libautoscoper/src/View.cpp

dd32d1639


      
          void View::render(unsigned int pbo, unsigned width, unsigned height)
          {
          #if defined(Autoscoper_RENDERING_USE_CUDA_BACKEND)
            struct cudaGraphicsResource* pboCudaResource;
            cutilSafeCall(cudaGraphicsGLRegisterBuffer(&pboCudaResource, pbo, cudaGraphicsMapFlagsWriteDiscard));
          
            float* buffer = NULL;
            size_t numOfBytes;
            cutilSafeCall(cudaGraphicsMapResources(1, &pboCudaResource, 0));
            cutilSafeCall(cudaGraphicsResourceGetMappedPointer((void**)&buffer, &numOfBytes, pboCudaResource));

The problematic call seems to be related to cudaGraphicsGLRegisterBuffer^[2], note that is expected to be supported and not marked as deprecated.

OpenCL backend

Based on the screenshot shared above ^[3], the code triggering the error when using the OpenCL backend can be inspected here (line 739):

github.com/BrownBiomechanics/Autoscoper

libautoscoper/src/gpu/opencl/OpenCL.cpp

dd32d1639


      
              pfn_clGetGLContextInfoKHR(prop, CL_DEVICES_FOR_GL_CONTEXT_KHR, 10 * sizeof(cl_device_id), devices_, &size);
              // Create a context using the supported devices
              int _count = size / sizeof(cl_device_id);
              if (used_device >= _count)
                used_device = 0;
              // fprintf(stderr,"%d Devices \n",_count);
              context_ = clCreateContext(prop, 1, &devices_[used_device], NULL, NULL, &err_);
              CHECK_CL
          #else
          #  pragma OPENCL EXTENSION cl_khr_gl_sharing : enable
              cl_context_properties prop[] = { CL_GL_CONTEXT_KHR,

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Trouble loading sample data in SlicerAutoscoperM

Details

CUDA Backend

OpenCL backend

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