Can I create a opencl buffer from a GraphicBuffer or a raw ion buffer

Hi songmao,

OpenCL will not do any kind of data interpretation on the data sampled from the image (Assuming you're not using any kind of interpolation on the image sampled), therefore you could use an RGBA8888 format for your GraphicBuffer and re-interpret it as YUY2 in your OpenCL kernel, do you see what I mean ?

Alternatively if you have a recent enough version of the driver ( >= r7p0) then you could use clImportMemoryARM to import a dma_buf allocation as a CL buffer.

Usually you will have a dma_buf file descriptor as part of the private data inside your Gralloc allocation. (However this is platform dependent, so this will depend on what device you're using).

Hope this helps,

Anthony

Hi songmao,

OpenCL will not do any kind of data interpretation on the data sampled from the image (Assuming you're not using any kind of interpolation on the image sampled), therefore you could use an RGBA8888 format for your GraphicBuffer and re-interpret it as YUY2 in your OpenCL kernel, do you see what I mean ?

Alternatively if you have a recent enough version of the driver ( >= r7p0) then you could use clImportMemoryARM to import a dma_buf allocation as a CL buffer.

Usually you will have a dma_buf file descriptor as part of the private data inside your Gralloc allocation. (However this is platform dependent, so this will depend on what device you're using).

Hope this helps,

Anthony

Hi songmao,

Here is how to use this extension:

      #define WIDTH  1024

      #define HEIGHT 512

      // Create buffer to be used as a hardware texture with graphics APIs (can also

      // include video/camera use flags here)

      int dma_buf_handle = get_dma_buf_handle_from_exporter_kernel_module( ..., WIDTH * HEIGHT * 2 );

      cl_int error = CL_SUCCESS;

      cl_mem buffer = clImportMemoryARM( ctx,

                                         CL_MEM_READ_WRITE,

                                         { CL_IMPORT_TYPE_ARM, CL_IMPORT_TYPE_DMA_BUF_ARM, 0 },

                                         &dma_buf_handle

                                         WIDTH * HEIGHT * 2,

                                         &error );

      if( error == CL_SUCCESS )

      {

          // Use <buffer> as you would any other cl_mem buffer

      }

However, without a more recent revision of the driver (>= r7p0) you won't be able to use it, sorry.

Regards,

Anthony

http://malideveloper.arm.com/resources/drivers/arm-mali-midgard-gpu-user-space-drivers/

And would you please suggest some opensource benchmark to evaluate the gpu/opencl performance?

Thanks,

Songmao

Hi songmao,

guillaume.tucker is preparing a release of an updated driver for the Firefly. It should be soon.

Kind Regards,

Michael McGeagh