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//
// 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 "libGLESv2/Context.h"
#include "common/tls.h"
static TLSIndex currentTLS = TLS_INVALID_INDEX;
namespace gl
{
// 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);
}
}
#if defined(ANGLE_PLATFORM_WINDOWS) && !defined(QT_OPENGL_ES_2_ANGLE_STATIC)
extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
{
switch (reason)
{
case DLL_PROCESS_ATTACH:
{
if (!gl::CreateThreadLocalIndex())
{
return FALSE;
}
#ifdef ANGLE_ENABLE_DEBUG_ANNOTATIONS
gl::InitializeDebugAnnotations();
#endif
}
// 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();
#ifdef ANGLE_ENABLE_DEBUG_ANNOTATIONS
gl::UninitializeDebugAnnotations();
#endif
}
break;
default:
break;
}
return TRUE;
}
#endif // ANGLE_PLATFORM_WINDOWS && !QT_OPENGL_ES_2_ANGLE_STATIC
namespace gl
{
Current *GetCurrentData()
{
#ifndef QT_OPENGL_ES_2_ANGLE_STATIC
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());
#else
// No precautions for thread safety taken as ANGLE is used single-threaded in Qt.
static Current current = { 0, 0 };
return ¤t;
#endif
}
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;
}
}
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