global_state.h

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Author : Jamie Madill
Date : 2018-09-23 17:28:55
Hash : 77db6f4a
Message : Use global Context lookup in single-threaded cases. In single-threaded cases we don't need to use a TLS lookup for the current Context. Assume a global context has 3 states: unset, set, and multi-threaded: * global context unset -> set the global context * global context set, matches TLS context -> set the global context * global context set, doesn't match TLS -> set multi-threaded * global context multi-threaded -> leave it This also inlines the global context/TLS check into global_state.h. Increases performance of the binding perf overhead test by up to 25% and the draw call perf test by up to 3%. Bug: angleproject:2824 Change-Id: Ib95953ca918f2408fe72ca83061f4e2d1bd1adad Reviewed-on: https://chromium-review.googlesource.com/1231993 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>

src/libGLESv2/global_state.h

//
// 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.h : Defines functions for querying the thread-local GL and EGL state.

#ifndef LIBGLESV2_GLOBALSTATE_H_
#define LIBGLESV2_GLOBALSTATE_H_

#include "libANGLE/Context.h"
#include "libANGLE/Debug.h"
#include "libANGLE/Thread.h"
#include "libANGLE/features.h"

#include <mutex>

namespace egl
{
class Debug;
class Thread;

Thread *GetCurrentThread();
Debug *GetDebug();
void SetContextCurrent(Thread *thread, gl::Context *context);
}  // namespace egl

namespace gl
{
extern Context *gSingleThreadedContext;

ANGLE_INLINE Context *GetGlobalContext()
{
    if (gSingleThreadedContext)
    {
        return gSingleThreadedContext;
    }

    egl::Thread *thread = egl::GetCurrentThread();
    return thread->getContext();
}

ANGLE_INLINE Context *GetValidGlobalContext()
{
    if (gSingleThreadedContext && !gSingleThreadedContext->isContextLost())
    {
        return gSingleThreadedContext;
    }

    egl::Thread *thread = egl::GetCurrentThread();
    return thread->getValidContext();
}

}  // namespace gl

#if ANGLE_FORCE_THREAD_SAFETY == ANGLE_ENABLED
namespace angle
{
std::mutex &GetGlobalMutex();
}  // namespace angle

#define ANGLE_SCOPED_GLOBAL_LOCK() \
    std::lock_guard<std::mutex> globalMutexLock(angle::GetGlobalMutex())
#else
#define ANGLE_SCOPED_GLOBAL_LOCK()
#endif

#endif  // LIBGLESV2_GLOBALSTATE_H_

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

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