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Steven Johnson
Merge pull request #15 from zeeshanu/patch-1


Fix typo
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README.md

ABOUT SAFELIGHT

Safelight is a web application that aids in developing Halide programs.
It currently works for NaCl-enabled x86-64 Linux and Mac OS machines running the PNaCl binary distribution of Halide.
Current features include:

  • Ability to build Halide filters given a generator.cpp file.
  • UI that displays a filter’s Stmt, Assembly, and Stdout.
  • UI that displays input parameters and result outputs.
  • A display of a run’s processing time.
  • Control over number of runtime threads.

This is not an official Google product.

HOW TO SETUP SAFELIGHT

Requirements:

  • x86_64 Linux or Mac

  • Google Chrome

  • NaCl SDK (Pepper 46 or later)

  • Go

  • PNaCl Halide

    • Safelight requires the PNaCl distribution of Halide.

    • If you do not already have a PNaCl binary distribution of Halide, you can run:

        $ ./safelight/getPnaclHalide.sh
  $ source ~/.bashrc
      • If on Linux, getPnaclHalide.sh will download the correct Halide binary distribution, install it within your safelight directory, and export HALIDE_DIR to your .bashrc.
      • If on Mac, getPnaclHalide.sh will provide you the link to download the correct Halide binary distribution, but you must extract it and point HALIDE_DIR to it manually.

    • Note: Using a non-PNaCl version of Halide (e.g. Trunk) will result in linker errors.

Required Environment Variables:

  • Ensure that all of the following environment variables are exported. Paths must be absolute.
    • SAFELIGHT_DIR=[path-to-Safelight]/safelight/
    • HALIDE_DIR=[path-to-Halide]/halide/
      • If on Linux, getPnaclHalide.sh automatically exports HALIDE_DIR to your .bashrc.
    • NACL_PEPPER_DIR=[path-to-NaCl]/nacl_sdk/pepper_[version-number]/

Enabling NaCl:

  • Enable Native Client under chrome://flags/#enable-nacl and restart Chrome.

Running the Server:

$ ./safelight/serve.sh

If all goes well, the console will output the following:

************************************
Safelight is running on http://<hostname>:6502
************************************

Navigate to http://[hostname]: //mirrors/Safelight/tree/master/6502inyourChromebrowser. safelight_start
Enjoy using Safelight!

Cleaning dependencies and executables:

$ ./safelight/clean.sh

HOW TO USE SAFELIGHT

Building:

  • In order to build your Halide Program, you must first populate the following
    text fields:
    1. "Function Name"
      e.g. “brighten” will yield “safelight_brighten.o/h” as your filter output.
    2. "Path to Generator" (paths may be absolute or relative to $SAFELIGHT_DIR)
      e.g. “[path-to-your-generator]/generator/brighten_generator.cpp” 
       or
      e.g. “generator/brighten_generator.cpp”
    3. "Target" (at the moment Safelight only supports x86-64-nacl)
  • After populating each field, click "Build"!
    -      Outputs Generator's .o, .h, .s, .stmt, and .nexe files.
  You can view the Stmt, Assembly, and Stdout by clicking the tabs on the right-hand side of the page.

Running Halide Programs:

  • If "Auto run filter on changes" is checked, your program should automatically run after it is built and anytime you upload a new image parameter, alter a number parameter, or change the number of threads.
  • If "Auto run filter on changes" is not checked, click "Run with # thread(s)" to run your program.
  • You may change the number of threads by expanding the "Run with # thread(s)" drop down menu and choosing the number of threads to run.

Example (Try it out!):

  • "Function Name": brighten
  • "Path to Generator": [path-to-safelight]/safelight/generator/brighten_generator.cpp
  • "Target": Chrome (x86-64-nacl-sse41)
  • Click "Build" to build the safelight_brighten filter.
    • A default image parameter and a brightness level range should appear like so:
      safelight-brighten-build
  • You may upload an image of your own by clicking the "Load" button and you may change the brightening factor.
    • If "Auto run filter on changes" is on, the brighten function will run automatically when you upload a new image, change the number of threads, or change the brightening factor. If you turn it off, click "Run with # thread(s)" to run your program.
  • Use the "Run with # thread(s)" drop-down menu to select the number of threads to run your program. Notice the change in processing time.
  • View the Stmt, Assembly, and Stdout of your Halide program.

TROUBLESHOOTING

If you encounter: 

        Error with command: /tmp/safelightTmp/filters/%s.generator ...

or

        Error with command: g++ ...

You might have downloaded an incompatible Halide binary distribution.
Run:

        $ ./safelight/getPnaclHalide.sh
        $ source ~/.bashrc

This will download the correct halide binary distribution and point your HALIDE_DIR environment variable to it within your ~/.bashrc.

If you plan to use an already existing PNaCl Halide version, please double check your required environment variables and ensure they are all pointing to the right directories. Then rerun:

    $ source ~/.bashrc

TESTING SAFELIGHT DEPENDENCIES

Safelight comes with test packages for C++ visualizers packaged_call_runtime, rgba8_visualizer_generator, and transmogrify_rgba8. Follow the instructions below to run Google Tests on these dependencies.

NaCl Dependency Testing:

Download the two libraries from the links below and point these environment variables to them:

  • Jsoncpp
    • export JSONCPP_DIR=[path-to-jsoncpp]
  • GTest
    • export GTEST_DIR=[path-to-googletest]

To test packaged_call_runtime, rgba8_visualizer_generator, and transmogrify_rgba8 run:

      $ ./safelight/testSafelight

A Successful Output:

    $ ./testSafelight.sh
    Building gtest...
    ar: creating gtest.a
    ar: creating gtest_main.a
    Building set_image_param_layout.o...
    Building buffer_utils_pepper.o...
    Building nexe_verb_handler.o...
    Building float32_to_rgba8_visualizer_chunky...
    ar: creating /tmp/safelightTmp/librgba8_visualizer.a
    Building float32_to_rgba8_visualizer_planar...
    Building float64_to_rgba8_visualizer_chunky...
    Building float64_to_rgba8_visualizer_planar...
    Building int8_to_rgba8_visualizer_chunky...
    Building int8_to_rgba8_visualizer_planar...
    Building int16_to_rgba8_visualizer_chunky...
    Building int16_to_rgba8_visualizer_planar...
    Building int32_to_rgba8_visualizer_chunky...
    Building int32_to_rgba8_visualizer_planar...
    Building uint8_to_rgba8_visualizer_chunky...
    Building uint8_to_rgba8_visualizer_planar...
    Building uint16_to_rgba8_visualizer_chunky...
    Building uint16_to_rgba8_visualizer_planar...
    Building uint32_to_rgba8_visualizer_chunky...
    Building uint32_to_rgba8_visualizer_planar...
    Building transmogrify_rgba8_to_float32...
    ar: creating /tmp/safelightTmp/libtransmogrify_rgba8.a
    Building transmogrify_rgba8_to_float64...
    Building transmogrify_rgba8_to_int8...
    Building transmogrify_rgba8_to_int16...
    Building transmogrify_rgba8_to_int32...
    Building transmogrify_rgba8_to_uint8...
    Building transmogrify_rgba8_to_uint16...
    Building transmogrify_rgba8_to_uint32...
    Building rgba8_visualizer.o...
    Building transmogrify_rgba8.o...
    >>>>>>>>>> PACKAGE CALL RUNTIME TESTING
    Amalgating header...
    Writing amalgated header to 'dist/json/json.h'
    Amalgating forward header...
    Writing amalgated forward header to 'dist/json/json-forwards.h'
    Amalgating source...
    Writing amalgated source to 'dist/jsoncpp.cpp'
    Source successfully amalagated
    Building jsoncpp.o...
    Building packaged_call_tester...
    Building copy_image_uint8_filter...
    ar: creating /tmp/safelightTmp/libcopy_image.a
    Building copy_image_uint16_filter...
    Building copy_image_float32_filter...
    Building packaged_call_runtime.o...
    Building packaged_call_test executable...
    Running packaged_call_test...
    Running main() from gtest_main.cc
    [==========] Running 2 tests from 1 test case.
    [----------] Global test environment set-up.
    [----------] 2 tests from PackagedCall
    [ RUN      ] PackagedCall.TestDescribe
    [       OK ] PackagedCall.TestDescribe (0 ms)
    [ RUN      ] PackagedCall.TestCall
    [       OK ] PackagedCall.TestCall (1 ms)
    [----------] 2 tests from PackagedCall (1 ms total)
    [----------] Global test environment tear-down
    [==========] 2 tests from 1 test case ran. (1 ms total)
    [  PASSED  ] 2 tests.
    >>>>>>>>>> RGBA8 VISUALIZER TESTING
    Running rgba8_visualizer_generator_test...
    Running main() from gtest_main.cc
    [==========] Running 8 tests from 1 test case.
    [----------] Global test environment set-up.
    [----------] 8 tests from Rgba8VisualizerGeneratorTest
    [ RUN      ] Rgba8VisualizerGeneratorTest.UInt8
    [       OK ] Rgba8VisualizerGeneratorTest.UInt8 (1 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.UInt16
    [       OK ] Rgba8VisualizerGeneratorTest.UInt16 (0 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.UInt32
    [       OK ] Rgba8VisualizerGeneratorTest.UInt32 (1 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.Int8
    [       OK ] Rgba8VisualizerGeneratorTest.Int8 (0 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.Int16
    [       OK ] Rgba8VisualizerGeneratorTest.Int16 (0 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.Int32
    [       OK ] Rgba8VisualizerGeneratorTest.Int32 (1 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.Float32
    [       OK ] Rgba8VisualizerGeneratorTest.Float32 (0 ms)
    [ RUN      ] Rgba8VisualizerGeneratorTest.Float64
    [       OK ] Rgba8VisualizerGeneratorTest.Float64 (0 ms)
    [----------] 8 tests from Rgba8VisualizerGeneratorTest (3 ms total)
    [----------] Global test environment tear-down
    [==========] 8 tests from 1 test case ran. (3 ms total)
    [  PASSED  ] 8 tests.
    >>>>>>>>>> TRANSMOGRIFY TESTING
    Running transmogrify_rgba8_test...
    Running main() from gtest_main.cc
    [==========] Running 8 tests from 1 test case.
    [----------] Global test environment set-up.
    [----------] 8 tests from TransmogrifyRgba8GeneratorTest
    [ RUN      ] TransmogrifyRgba8GeneratorTest.UInt8
    [       OK ] TransmogrifyRgba8GeneratorTest.UInt8 (1483 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.UInt16
    [       OK ] TransmogrifyRgba8GeneratorTest.UInt16 (1931 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.UInt32
    [       OK ] TransmogrifyRgba8GeneratorTest.UInt32 (2068 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.Int8
    [       OK ] TransmogrifyRgba8GeneratorTest.Int8 (1241 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.Int16
    [       OK ] TransmogrifyRgba8GeneratorTest.Int16 (1906 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.Int32
    [       OK ] TransmogrifyRgba8GeneratorTest.Int32 (2031 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.Float32
    [       OK ] TransmogrifyRgba8GeneratorTest.Float32 (2075 ms)
    [ RUN      ] TransmogrifyRgba8GeneratorTest.Float64
    [       OK ] TransmogrifyRgba8GeneratorTest.Float64 (2198 ms)
    [----------] 8 tests from TransmogrifyRgba8GeneratorTest (14933 ms total)
    [----------] Global test environment tear-down
    [==========] 8 tests from 1 test case ran. (14933 ms total)
    [  PASSED  ] 8 tests.
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