test-opencl.hs

{- Copyright (c) 2011 Luis Cabellos,

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-- -----------------------------------------------------------------------------
import Foreign( castPtr, nullPtr, sizeOf )
import Foreign.C.Types( CInt )
import Foreign.Marshal.Array( newArray, peekArray )
import Test.QuickCheck( Property, Testable, quickCheckWithResult, (==>) )
import Test.QuickCheck.Monadic( monadicIO, assert, run )
import Test.QuickCheck.Test( Result, Args(..), isSuccess, stdArgs )
import Text.Printf( printf )
import System.Exit( exitSuccess, exitFailure )
import Control.Parallel.OpenCL

-- -----------------------------------------------------------------------------
clDupSource :: String
clDupSource = "__kernel void duparray(__global int *in, __global int *out ){\n  int id = get_global_id(0);\n  out[id] = 2*in[id];\n}"

dupOpencl :: [Int] -> IO [Int]
dupOpencl xs = do
  -- Initialize OpenCL
  (platform:_) <- clGetPlatformIDs
  (dev:_) <- clGetDeviceIDs platform CL_DEVICE_TYPE_ALL
  context <- clCreateContext [] [dev] print
  q <- clCreateCommandQueue context dev []
  
  -- Initialize Kernel
  program <- clCreateProgramWithSource context clDupSource
  clBuildProgram program [dev] ""
  kernel <- clCreateKernel program "duparray"
  
  -- Initialize parameters
  let original = map fromIntegral xs :: [CInt]
      elemSize = sizeOf (0 :: CInt)
      vecSize = elemSize * length original

  input  <- newArray original

  mem_in <- clCreateBuffer context [CL_MEM_READ_ONLY, CL_MEM_COPY_HOST_PTR] (vecSize, castPtr input)  
  mem_out <- clCreateBuffer context [CL_MEM_WRITE_ONLY] (vecSize, nullPtr)

  clSetKernelArgSto kernel 0 mem_in
  clSetKernelArgSto kernel 1 mem_out
  
  -- Execute Kernel
  eventExec <- clEnqueueNDRangeKernel q kernel [length original] [1] []
  
  -- Get Result
  _ <- clEnqueueReadBuffer q mem_out True 0 vecSize (castPtr input) [eventExec]
  
  _ <- clReleaseMemObject mem_in
  _ <- clReleaseMemObject mem_out
  
  result <- peekArray (length original) input

  return $ map fromIntegral result

dupHaskell :: [Int] -> [Int]
dupHaskell = map (*2)

prop_dup :: [Int] -> Property
prop_dup xs = not (null xs) ==> monadicIO test
  where
    test = do
      ys <- run $ dupOpencl xs
      assert (dupHaskell xs == ys)

-- -----------------------------------------------------------------------------
fastCheck :: Testable prop => prop -> IO Result
fastCheck = quickCheckWithResult stdArgs{ maxSuccess = 20, maxSize = 50 }

tests :: [(String, IO Result)]
tests = 
  [ ("Opencl: duplicate int array", fastCheck prop_dup) ]

-- -----------------------------------------------------------------------------
main :: IO ()
main = do
  results <- mapM (\(s,a) -> printf "%-25s: " s >> a) tests
  if all isSuccess results
    then exitSuccess 
    else exitFailure

-- -----------------------------------------------------------------------------