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

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• Author : Geoff Lang
  Date : 2014-12-03 14:48:07
  Hash : e7c6e43c
  Message : Implement all entry points in libGLES and have libEGL act as a shim. This allows libANGLE to only be included in libGLESv2 and moves all TLS data to libGLESv2.dll. BUG=angle:733 Change-Id: I34f0b47987a5efbe906c290d3ca656142e69ea9a Reviewed-on: https://chromium-review.googlesource.com/232962 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libGLESv2/global_state.cpp

• //
  // Copyright(c) 2014 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.
  //
  
  // global_state.cpp : Implements functions for querying the thread-local GL and EGL state.
  
  #include "libGLESv2/global_state.h"
  
  #include "libANGLE/Context.h"
  #include "libANGLE/Error.h"
  
  #include "common/debug.h"
  #include "common/platform.h"
  #include "common/tls.h"
  
  namespace
  {
  
  static TLSIndex currentTLS = TLS_INVALID_INDEX;
  
  struct Current
  {
      EGLint error;
      EGLenum API;
      egl::Display *display;
      egl::Surface *drawSurface;
      egl::Surface *readSurface;
      gl::Context *context;
  };
  
  Current *AllocateCurrent()
  {
      ASSERT(currentTLS != TLS_INVALID_INDEX);
      if (currentTLS == TLS_INVALID_INDEX)
      {
          return NULL;
      }
  
      Current *current = new Current();
      current->error = EGL_SUCCESS;
      current->API = EGL_OPENGL_ES_API;
      current->display = reinterpret_cast<egl::Display*>(EGL_NO_DISPLAY);
      current->drawSurface = reinterpret_cast<egl::Surface*>(EGL_NO_SURFACE);
      current->readSurface = reinterpret_cast<egl::Surface*>(EGL_NO_SURFACE);
      current->context = reinterpret_cast<gl::Context*>(EGL_NO_CONTEXT);
  
      if (!SetTLSValue(currentTLS, current))
      {
          ERR("Could not set thread local storage.");
          return NULL;
      }
  
      return current;
  }
  
  void DeallocateCurrent()
  {
      Current *current = reinterpret_cast<Current*>(GetTLSValue(currentTLS));
      SafeDelete(current);
      SetTLSValue(currentTLS, NULL);
  }
  
  Current *GetCurrentData()
  {
      // Create a TLS index if one has not been created for this DLL
      if (currentTLS == TLS_INVALID_INDEX)
      {
          currentTLS = CreateTLSIndex();
      }
  
      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());
  }
  
  #ifdef ANGLE_PLATFORM_WINDOWS
  extern "C" BOOL WINAPI DllMain(HINSTANCE, DWORD reason, LPVOID)
  {
      switch (reason)
      {
        case DLL_PROCESS_ATTACH:
          currentTLS = CreateTLSIndex();
          if (currentTLS == TLS_INVALID_INDEX)
          {
              return FALSE;
          }
          AllocateCurrent();
          break;
  
        case DLL_THREAD_ATTACH:
          AllocateCurrent();
          break;
  
        case DLL_THREAD_DETACH:
          DeallocateCurrent();
          break;
  
        case DLL_PROCESS_DETACH:
          DeallocateCurrent();
          if (currentTLS != TLS_INVALID_INDEX)
          {
              DestroyTLSIndex(currentTLS);
              currentTLS = TLS_INVALID_INDEX;
          }
          break;
      }
  
      return TRUE;
  }
  #endif
  
  }
  
  namespace gl
  {
  
  Context *GetGlobalContext()
  {
      Current *current = GetCurrentData();
  
      return current->context;
  }
  
  Context *GetValidGlobalContext()
  {
      gl::Context *context = GetGlobalContext();
      if (context)
      {
          if (context->isContextLost())
          {
              context->recordError(gl::Error(GL_OUT_OF_MEMORY, "Context has been lost."));
              return nullptr;
          }
          else
          {
              return context;
          }
      }
      return nullptr;
  }
  
  }
  
  namespace egl
  {
  
  void SetGlobalError(const Error &error)
  {
      Current *current = GetCurrentData();
  
      current->error = error.getCode();
  }
  
  EGLint GetGlobalError()
  {
      Current *current = GetCurrentData();
  
      return current->error;
  }
  
  EGLenum GetGlobalAPI()
  {
      Current *current = GetCurrentData();
  
      return current->API;
  }
  
  void SetGlobalAPI(EGLenum API)
  {
      Current *current = GetCurrentData();
  
      current->API = API;
  }
  
  void SetGlobalDisplay(Display *dpy)
  {
      Current *current = GetCurrentData();
  
      current->display = dpy;
  }
  
  Display *GetGlobalDisplay()
  {
      Current *current = GetCurrentData();
  
      return current->display;
  }
  
  void SetGlobalDrawSurface(Surface *surface)
  {
      Current *current = GetCurrentData();
  
      current->drawSurface = surface;
  }
  
  Surface *GetGlobalDrawSurface()
  {
      Current *current = GetCurrentData();
  
      return current->drawSurface;
  }
  
  void SetGlobalReadSurface(Surface *surface)
  {
      Current *current = GetCurrentData();
  
      current->readSurface = surface;
  }
  
  Surface *GetGlobalReadSurface()
  {
      Current *current = GetCurrentData();
  
      return current->readSurface;
  }
  
  void SetGlobalContext(gl::Context *context)
  {
      Current *current = GetCurrentData();
  
      current->context = context;
  }
  
  gl::Context *GetGlobalContext()
  {
      Current *current = GetCurrentData();
  
      return current->context;
  }
  
  }