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//
// Copyright 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"
#if defined(ANGLE_PLATFORM_APPLE) || (ANGLE_PLATFORM_ANDROID)
# include "common/tls.h"
#endif
#include <mutex>
namespace angle
{
using GlobalMutex = std::recursive_mutex;
// - TLS_SLOT_OPENGL and TLS_SLOT_OPENGL_API: These two aren't used by bionic
// itself, but allow the graphics code to access TLS directly rather than
// using the pthread API.
//
// Choose the TLS_SLOT_OPENGL TLS slot with the value that matches value in the header file in
// bionic(tls_defines.h)
constexpr size_t kAndroidOpenGLTlsSlot = 3;
#if defined(ANGLE_PLATFORM_ANDROID)
// The following ASM variant provides a much more performant store/retrieve interface
// compared to those provided by the pthread library. These have been derived from code
// in the bionic module of Android ->
// https://cs.android.com/android/platform/superproject/+/master:bionic/libc/platform/bionic/tls.h;l=30
# if defined(__aarch64__)
# define ANGLE_ANDROID_GET_GL_TLS() \
({ \
void **__val; \
__asm__("mrs %0, tpidr_el0" : "=r"(__val)); \
__val; \
})
# elif defined(__arm__)
# define ANGLE_ANDROID_GET_GL_TLS() \
({ \
void **__val; \
__asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__val)); \
__val; \
})
# elif defined(__mips__)
// On mips32r1, this goes via a kernel illegal instruction trap that's
// optimized for v1
# define ANGLE_ANDROID_GET_GL_TLS() \
({ \
register void **__val asm("v1"); \
__asm__( \
".set push\n" \
".set mips32r2\n" \
"rdhwr %0,$29\n" \
".set pop\n" \
: "=r"(__val)); \
__val; \
})
# elif defined(__i386__)
# define ANGLE_ANDROID_GET_GL_TLS() \
({ \
void **__val; \
__asm__("movl %%gs:0, %0" : "=r"(__val)); \
__val; \
})
# elif defined(__x86_64__)
# define ANGLE_ANDROID_GET_GL_TLS() \
({ \
void **__val; \
__asm__("mov %%fs:0, %0" : "=r"(__val)); \
__val; \
})
# else
# error unsupported architecture
# endif
#endif // ANGLE_PLATFORM_ANDROID
} // namespace angle
namespace egl
{
class Debug;
class Thread;
#if defined(ANGLE_PLATFORM_APPLE)
extern Thread *GetCurrentThreadTLS();
extern void SetCurrentThreadTLS(Thread *thread);
#else
extern thread_local Thread *gCurrentThread;
#endif
angle::GlobalMutex &GetGlobalMutex();
angle::GlobalMutex &GetGlobalSurfaceMutex();
gl::Context *GetGlobalLastContext();
void SetGlobalLastContext(gl::Context *context);
Thread *GetCurrentThread();
Debug *GetDebug();
// Sync the current context from Thread to global state.
class [[nodiscard]] ScopedSyncCurrentContextFromThread
{
public:
ScopedSyncCurrentContextFromThread(egl::Thread *thread);
~ScopedSyncCurrentContextFromThread();
private:
egl::Thread *const mThread;
};
} // namespace egl
#define ANGLE_GLOBAL_SURFACE_LOCK_VAR_NAME globalSurfaceMutexLock
#define ANGLE_SCOPED_GLOBAL_SURFACE_LOCK() \
std::lock_guard<angle::GlobalMutex> ANGLE_GLOBAL_SURFACE_LOCK_VAR_NAME( \
egl::GetGlobalSurfaceMutex())
#define ANGLE_GLOBAL_LOCK_VAR_NAME globalMutexLock
#define ANGLE_SCOPED_GLOBAL_LOCK() \
std::lock_guard<angle::GlobalMutex> ANGLE_GLOBAL_LOCK_VAR_NAME(egl::GetGlobalMutex())
namespace gl
{
ANGLE_INLINE Context *GetGlobalContext()
{
#if defined(ANGLE_USE_ANDROID_TLS_SLOT)
// TODO: Replace this branch with a compile time flag (http://anglebug.com/4764)
if (angle::gUseAndroidOpenGLTlsSlot)
{
return static_cast<gl::Context *>(ANGLE_ANDROID_GET_GL_TLS()[angle::kAndroidOpenGLTlsSlot]);
}
#endif
#if defined(ANGLE_PLATFORM_APPLE)
egl::Thread *currentThread = egl::GetCurrentThreadTLS();
#else
egl::Thread *currentThread = egl::gCurrentThread;
#endif
ASSERT(currentThread);
return currentThread->getContext();
}
ANGLE_INLINE Context *GetValidGlobalContext()
{
#if defined(ANGLE_USE_ANDROID_TLS_SLOT)
// TODO: Replace this branch with a compile time flag (http://anglebug.com/4764)
if (angle::gUseAndroidOpenGLTlsSlot)
{
Context *context =
static_cast<gl::Context *>(ANGLE_ANDROID_GET_GL_TLS()[angle::kAndroidOpenGLTlsSlot]);
if (context && !context->isContextLost())
{
return context;
}
}
#endif
#if defined(ANGLE_PLATFORM_APPLE)
return GetCurrentValidContextTLS();
#else
return gCurrentValidContext;
#endif
}
// Generate a context lost error on the context if it is non-null and lost.
void GenerateContextLostErrorOnContext(Context *context);
void GenerateContextLostErrorOnCurrentGlobalContext();
#if defined(ANGLE_FORCE_CONTEXT_CHECK_EVERY_CALL)
// TODO(b/177574181): This should be handled in a backend-specific way.
// if previous context different from current context, dirty all state
static ANGLE_INLINE void DirtyContextIfNeeded(Context *context)
{
if (context && context != egl::GetGlobalLastContext())
{
context->dirtyAllState();
SetGlobalLastContext(context);
}
}
#endif
#if !defined(ANGLE_ENABLE_SHARE_CONTEXT_LOCK)
# define SCOPED_SHARE_CONTEXT_LOCK(context)
#else
ANGLE_INLINE std::unique_lock<angle::GlobalMutex> GetContextLock(Context *context)
{
# if defined(ANGLE_FORCE_CONTEXT_CHECK_EVERY_CALL)
auto lock = std::unique_lock<angle::GlobalMutex>(egl::GetGlobalMutex());
DirtyContextIfNeeded(context);
return lock;
# else
return context->isShared() ? std::unique_lock<angle::GlobalMutex>(egl::GetGlobalMutex())
: std::unique_lock<angle::GlobalMutex>();
# endif
}
# define SCOPED_SHARE_CONTEXT_LOCK(context) \
std::unique_lock<angle::GlobalMutex> shareContextLock = GetContextLock(context)
#endif
} // namespace gl
#endif // LIBGLESV2_GLOBALSTATE_H_
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