kc3-lang/angle/src/common/system_utils_win32.cpp

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• Hash : 48da1c35
  Author :
  Date : 2021-07-16T13:24:34
  

  Vulkan: Prefer the local vulkan loader over the system one.
  
  Load the Vulkan loader ourselves and give vkGetInstanceProcAddr to
  volk. This allows us to always prefer loading from the current module
  directory instead of using the platform-specific ordering.
  
  Refactor angle::Library loading to use ModuleDir instead of
  ApplicationDir.
  
  CL originally authored by Geoff Lang.
  
  Bug: chromium:1219969
  Change-Id: I21d1926e90fd66e1c23cea7323991ae55f3d22d4
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3035444
  Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/common/system_utils_win32.cpp

• //
  // Copyright 2019 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.
  //
  // system_utils_win32.cpp: Implementation of OS-specific functions for Windows.
  
  #include "system_utils.h"
  
  #include <windows.h>
  #include <array>
  
  namespace angle
  {
  bool UnsetEnvironmentVar(const char *variableName)
  {
      return (SetEnvironmentVariableA(variableName, nullptr) == TRUE);
  }
  
  bool SetEnvironmentVar(const char *variableName, const char *value)
  {
      return (SetEnvironmentVariableA(variableName, value) == TRUE);
  }
  
  std::string GetEnvironmentVar(const char *variableName)
  {
      std::array<char, MAX_PATH> oldValue;
      DWORD result =
          GetEnvironmentVariableA(variableName, oldValue.data(), static_cast<DWORD>(oldValue.size()));
      if (result == 0)
      {
          return std::string();
      }
      else
      {
          return std::string(oldValue.data());
      }
  }
  
  class Win32Library : public Library
  {
    public:
      Win32Library(const char *libraryName, SearchType searchType)
      {
          switch (searchType)
          {
              case SearchType::ModuleDir:
              {
                  std::string moduleRelativePath = ConcatenatePath(GetModuleDirectory(), libraryName);
                  mModule                        = LoadLibraryA(moduleRelativePath.c_str());
                  break;
              }
  
              case SearchType::SystemDir:
                  mModule = LoadLibraryExA(libraryName, nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
                  break;
              case SearchType::AlreadyLoaded:
                  mModule = GetModuleHandleA(libraryName);
                  break;
          }
      }
  
      ~Win32Library() override
      {
          if (mModule)
          {
              FreeLibrary(mModule);
          }
      }
  
      void *getSymbol(const char *symbolName) override
      {
          if (!mModule)
          {
              fprintf(stderr, "Module was not loaded\n");
              return nullptr;
          }
  
          return reinterpret_cast<void *>(GetProcAddress(mModule, symbolName));
      }
  
      void *getNative() const override { return reinterpret_cast<void *>(mModule); }
  
      std::string getPath() const override
      {
          if (!mModule)
          {
              return "";
          }
  
          std::array<char, MAX_PATH> buffer;
          if (GetModuleFileNameA(mModule, buffer.data(), buffer.size()) == 0)
          {
              return "";
          }
  
          return std::string(buffer.data());
      }
  
    private:
      HMODULE mModule = nullptr;
  };
  
  Library *OpenSharedLibrary(const char *libraryName, SearchType searchType)
  {
      char buffer[MAX_PATH];
      int ret = snprintf(buffer, MAX_PATH, "%s.%s", libraryName, GetSharedLibraryExtension());
      if (ret > 0 && ret < MAX_PATH)
      {
          return new Win32Library(buffer, searchType);
      }
      else
      {
          fprintf(stderr, "Error loading shared library: 0x%x", ret);
          return nullptr;
      }
  }
  
  Library *OpenSharedLibraryWithExtension(const char *libraryName, SearchType searchType)
  {
      return new Win32Library(libraryName, searchType);
  }
  }  // namespace angle
  

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