Add test for PerlinNoise source

data/baseline/source/perlin-noise.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:23325fa15322c944b3ffae737accc32cc9b44288fd156870974c8eb47f0a09c3
+size 44080

data/baseline/source/perlin-noise0.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:80e7e0264064b2ea3f64353db07f6b39177d837110989558395f52c2c12747f2
+size 40865

vtkm/rendering/testing/CMakeLists.txt

@@ -39,7 +39,7 @@ vtkm_library(
   DEVICE_SOURCES ${library_sources}
   HEADERS ${headers}
   )
-target_link_libraries(vtkm_rendering_testing PUBLIC vtkm_cont_testing)
-target_link_libraries(vtkm_rendering_testing PRIVATE vtkm_io vtkm_rendering)
+target_link_libraries(vtkm_rendering_testing PUBLIC vtkm_cont_testing vtkm_rendering)
+target_link_libraries(vtkm_rendering_testing PRIVATE vtkm_io)
 
 vtkm_unit_tests(SOURCES ${unit_tests} ALL_BACKENDS LIBRARIES vtkm_rendering vtkm_rendering_testing)

vtkm/source/PerlinNoise.cxx

@@ -155,7 +155,7 @@ private:
   {
     std::mt19937_64 rng;
     rng.seed(this->Seed);
-    std::uniform_int_distribution<vtkm::Id> distribution(0, this->TableSize - 1);
+    std::uniform_int_distribution<vtkm::IdComponent> distribution(0, this->TableSize - 1);
 
     vtkm::cont::ArrayHandle<vtkm::Id> perms;
     perms.Allocate(this->TableSize);

vtkm/source/testing/CMakeLists.txt

@@ -14,7 +14,25 @@ set(unit_tests
   UnitTestWaveletSource.cxx
  )
 
+set(libraries
+  vtkm_source
+  )
+
+if (VTKm_ENABLE_RENDERING)
+  list(APPEND libraries vtkm_rendering_testing)
+
+  list(APPEND unit_tests
+    RenderTestPerlinNoise.cxx
+    )
+
+  # Currently to use the rendering in VTK-m, you have to compile with a device compiler.
+  # We hope to change that in the near future, but until then we need to add the
+  # `ALL_BACKENDS` flag to `vtkm_unit_tests` to compile with the device compiler. Here
+  # is a hack to add it.
+  list(APPEND unit_tests ALL_BACKENDS)
+endif()
+
 vtkm_unit_tests(
   SOURCES ${unit_tests}
-  LIBRARIES vtkm_source
+  LIBRARIES ${libraries}
 )

vtkm/source/testing/RenderTestPerlinNoise.cxx

@@ -0,0 +1,50 @@
+//============================================================================
+//  Copyright (c) Kitware, Inc.
+//  All rights reserved.
+//  See LICENSE.txt for details.
+//
+//  This software is distributed WITHOUT ANY WARRANTY; without even
+//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+//  PURPOSE.  See the above copyright notice for more information.
+//============================================================================
+
+#include <vtkm/source/PerlinNoise.h>
+
+#include <vtkm/filter/Contour.h>
+
+#include <vtkm/rendering/CanvasRayTracer.h>
+#include <vtkm/rendering/MapperRayTracer.h>
+#include <vtkm/rendering/View3D.h>
+
+#include <vtkm/rendering/testing/RenderTest.h>
+#include <vtkm/rendering/testing/Testing.h>
+
+namespace
+{
+
+void TestPerlinNoise()
+{
+  vtkm::source::PerlinNoise noiseSource(vtkm::Id3(16), 77698);
+  vtkm::cont::DataSet noise = noiseSource.Execute();
+
+  noise.PrintSummary(std::cout);
+
+  vtkm::filter::Contour contourFilter;
+  contourFilter.SetIsoValues({ 0.3, 0.4, 0.5, 0.6, 0.7 });
+  contourFilter.SetActiveField("perlinnoise");
+  vtkm::cont::DataSet contours = contourFilter.Execute(noise);
+
+  // CUDA seems to make the contour slightly different, so relax comparison options.
+  vtkm::rendering::testing::RenderTestOptions options;
+  options.AllowedPixelErrorRatio = 0.01f;
+  options.Threshold = 0.1f;
+
+  vtkm::rendering::testing::RenderTest(contours, "perlinnoise", "source/perlin-noise.png", options);
+}
+
+} // anonymous namespace
+
+int RenderTestPerlinNoise(int argc, char* argv[])
+{
+  return vtkm::cont::testing::Testing::Run(TestPerlinNoise, argc, argv);
+}