kc3-lang/angle/src/libOpenCL/dispatch.cpp

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• Hash : 7107a0f3
  Author :
  Date : 2021-05-16T15:37:44
  

  CL: Load OpenCL without search path modification
  
  Make it possible to load libGLESv2 and OpenCL_ANGLE without adding
  ANGLE's binary directory to the search path.
  
  Bug: angleproject:5904
  Change-Id: Ie810466b39e1101e4da5b9fd199d26683b129281
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2897250
  Commit-Queue: John Plate <jplate@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  

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• src/libOpenCL/dispatch.cpp

• //
  // Copyright 2021 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // dispatch.cpp: Implements a function to fetch the ANGLE OpenCL dispatch table.
  
  #include "libOpenCL/dispatch.h"
  
  #include "anglebase/no_destructor.h"
  #include "common/debug.h"
  #include "common/system_utils.h"
  
  #include <memory>
  
  #ifdef _WIN32
  #    include <windows.h>
  #endif
  
  namespace cl
  {
  
  namespace
  {
  
  std::unique_ptr<angle::Library> &EntryPointsLib()
  {
      static angle::base::NoDestructor<std::unique_ptr<angle::Library>> sEntryPointsLib;
      return *sEntryPointsLib;
  }
  
  IcdDispatch CreateDispatch()
  {
      const cl_icd_dispatch *clIcdDispatch = nullptr;
      const char *error                    = nullptr;
  
      // Try to find ANGLE's GLESv2 library in the consistent way, which might fail
      // if the current library or a link to it is not in ANGLE's binary directory
      EntryPointsLib().reset(
          angle::OpenSharedLibrary(ANGLE_GLESV2_LIBRARY_NAME, angle::SearchType::ApplicationDir));
      if (EntryPointsLib() && EntryPointsLib()->getNative() != nullptr)
      {
          EntryPointsLib()->getAs("gCLIcdDispatchTable", &clIcdDispatch);
          if (clIcdDispatch == nullptr)
          {
              INFO() << "Found system's instead of ANGLE's GLESv2 library";
          }
      }
      else
      {
          error = "Not able to find GLESv2 library";
      }
  
      // If not found try to find ANGLE's GLESv2 library in build path
      if (clIcdDispatch == nullptr)
      {
  #ifdef _WIN32
          // On Windows the build path 'ANGLE_GLESV2_LIBRARY_PATH' is provided by the build system
          const char path[] = ANGLE_GLESV2_LIBRARY_PATH "\\" ANGLE_GLESV2_LIBRARY_NAME ".dll";
          // This function allows to load further dependent libraries from the same directory
          HMODULE handle = LoadLibraryExA(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
          if (handle != nullptr)
          {
              clIcdDispatch = reinterpret_cast<const cl_icd_dispatch *>(
                  GetProcAddress(handle, "gCLIcdDispatchTable"));
              if (clIcdDispatch == nullptr)
              {
                  error = "Error loading CL dispatch table.";
              }
          }
  #else
          // On posix-compatible systems this will also search in the rpath, which is the build path
          EntryPointsLib().reset(
              angle::OpenSharedLibrary(ANGLE_GLESV2_LIBRARY_NAME, angle::SearchType::SystemDir));
          if (EntryPointsLib() && EntryPointsLib()->getNative() != nullptr)
          {
              EntryPointsLib()->getAs("gCLIcdDispatchTable", &clIcdDispatch);
              if (clIcdDispatch == nullptr)
              {
                  INFO() << "Found system's instead of ANGLE's GLESv2 library";
              }
          }
  #endif
      }
  
      IcdDispatch dispatch;
      if (clIcdDispatch != nullptr)
      {
          static_cast<cl_icd_dispatch &>(dispatch) = *clIcdDispatch;
          dispatch.clIcdGetPlatformIDsKHR          = reinterpret_cast<clIcdGetPlatformIDsKHR_fn>(
              clIcdDispatch->clGetExtensionFunctionAddress("clIcdGetPlatformIDsKHR"));
      }
      else if (error != nullptr)
      {
          ERR() << error;
      }
      return dispatch;
  }
  
  }  // anonymous namespace
  
  const IcdDispatch &GetDispatch()
  {
      static const IcdDispatch sDispatch(CreateDispatch());
      return sDispatch;
  }
  
  }  // namespace cl
  

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