kc3-lang/angle/src/libGLESv2/main.cpp

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• Author : Geoff Lang
  Date : 2014-11-20 16:23:31
  Hash : 8bc361e1
  Message : Support compiling libANGLE as a static or shared library. BUG=angle:733 Change-Id: If27d3330534bce0f5b691010ea7d97bcb7579122 Reviewed-on: https://chromium-review.googlesource.com/231052 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libGLESv2/main.cpp

• //
  // Copyright (c) 2002-2012 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.
  //
  
  // main.cpp: DLL entry point and management of thread-local data.
  
  #include "libGLESv2/main.h"
  
  #include "libANGLE/Context.h"
  
  #include "common/tls.h"
  
  static TLSIndex currentTLS = TLS_INVALID_INDEX;
  
  namespace gl
  {
  
  struct Current
  {
      Context *context;
      egl::Display *display;
  };
  
  // TODO(kbr): figure out how these are going to be managed on
  // non-Windows platforms. These routines would need to be exported
  // from ANGLE and called cooperatively when users create and destroy
  // threads -- or the initialization of the TLS index, and allocation
  // of thread-local data, will have to be done lazily. Will have to use
  // destructor function with pthread_create_key on POSIX platforms to
  // clean up thread-local data.
  
  // Call this exactly once at process startup.
  bool CreateThreadLocalIndex()
  {
      currentTLS = CreateTLSIndex();
      if (currentTLS == TLS_INVALID_INDEX)
      {
          return false;
      }
      return true;
  }
  
  // Call this exactly once at process shutdown.
  void DestroyThreadLocalIndex()
  {
      DestroyTLSIndex(currentTLS);
      currentTLS = TLS_INVALID_INDEX;
  }
  
  // Call this upon thread startup.
  Current *AllocateCurrent()
  {
      ASSERT(currentTLS != TLS_INVALID_INDEX);
      if (currentTLS == TLS_INVALID_INDEX)
      {
          return NULL;
      }
  
      Current *current = new Current();
      current->context = NULL;
      current->display = NULL;
  
      if (!SetTLSValue(currentTLS, current))
      {
          ERR("Could not set thread local storage.");
          return NULL;
      }
  
      return current;
  }
  
  // Call this upon thread shutdown.
  void DeallocateCurrent()
  {
      Current *current = reinterpret_cast<Current*>(GetTLSValue(currentTLS));
      SafeDelete(current);
      SetTLSValue(currentTLS, NULL);
  }
  
  }
  
  #ifdef ANGLE_PLATFORM_WINDOWS
  extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
  {
      switch (reason)
      {
        case DLL_PROCESS_ATTACH:
          {
              if (!gl::CreateThreadLocalIndex())
              {
                  return FALSE;
              }
          }
          // Fall through to initialize index
        case DLL_THREAD_ATTACH:
          {
              gl::AllocateCurrent();
          }
          break;
        case DLL_THREAD_DETACH:
          {
              gl::DeallocateCurrent();
          }
          break;
        case DLL_PROCESS_DETACH:
          {
              gl::DeallocateCurrent();
              gl::DestroyThreadLocalIndex();
          }
          break;
        default:
          break;
      }
  
      return TRUE;
  }
  #endif
  
  namespace gl
  {
  
  Current *GetCurrentData()
  {
      Current *current = reinterpret_cast<Current*>(GetTLSValue(currentTLS));
  
      // ANGLE issue 488: when the dll is loaded after thread initialization,
      // thread local storage (current) might not exist yet.
      return (current ? current : AllocateCurrent());
  }
  
  void makeCurrent(Context *context, egl::Display *display, egl::Surface *surface)
  {
      Current *current = GetCurrentData();
  
      current->context = context;
      current->display = display;
  
      if (context && display && surface)
      {
          context->makeCurrent(surface);
      }
  }
  
  Context *getContext()
  {
      Current *current = GetCurrentData();
  
      return current->context;
  }
  
  Context *getNonLostContext()
  {
      Context *context = getContext();
  
      if (context)
      {
          if (context->isContextLost())
          {
              context->recordError(Error(GL_OUT_OF_MEMORY, "Context has been lost."));
              return NULL;
          }
          else
          {
              return context;
          }
      }
      return NULL;
  }
  
  egl::Display *getDisplay()
  {
      Current *current = GetCurrentData();
  
      return current->display;
  }
  
  }
  
  extern "C"
  {
  
  void glMakeCurrent(gl::Context *context, egl::Display *display, egl::Surface *surface)
  {
      gl::makeCurrent(context, display, surface);
  }
  
  gl::Context *glGetCurrentContext()
  {
      return gl::getContext();
  }
  
  }