global_state.cpp

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Author : Geoff Lang
Date : 2020-10-20 13:55:23
Hash : d8529380
Message : Generate CONTEXT_LOST errors on every GL call. The robustness spec states that all GL calls should generate context lost errors when the context is lost. This behaviour was lost due to some context lookup optimizations but can be re-added at no cost by updating the autogenerated entry points. Updated the ContextLostTest to cover the repeated error generation behaviour. Bug: chromium:1137241 Change-Id: I0b8d1cf4d2a37f13c466c8dd0e66edfe852f7e59 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2488180 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>

src/libGLESv2/global_state.cpp

//
// 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.cpp : Implements functions for querying the thread-local GL and EGL state.

#include "libGLESv2/global_state.h"

#include "common/debug.h"
#include "common/platform.h"
#include "common/system_utils.h"
#include "libANGLE/ErrorStrings.h"
#include "libGLESv2/resource.h"

#include <atomic>

namespace egl
{
namespace
{
Debug *g_Debug = nullptr;

ANGLE_REQUIRE_CONSTANT_INIT std::atomic<angle::GlobalMutex *> g_Mutex(nullptr);
static_assert(std::is_trivially_destructible<decltype(g_Mutex)>::value,
              "global mutex is not trivially destructible");

void SetContextToAndroidOpenGLTLSSlot(gl::Context *value)
{
#if defined(ANGLE_PLATFORM_ANDROID)
    if (angle::gUseAndroidOpenGLTlsSlot)
    {
        ANGLE_ANDROID_GET_GL_TLS()[angle::kAndroidOpenGLTlsSlot] = static_cast<void *>(value);
    }
#endif
}

Thread *AllocateCurrentThread()
{
    gCurrentThread = new Thread();

    // Initialize fast TLS slot
    SetContextToAndroidOpenGLTLSSlot(nullptr);
    gl::gCurrentValidContext = nullptr;

    return gCurrentThread;
}

void AllocateDebug()
{
    // All EGL calls use a global lock, this is thread safe
    if (g_Debug == nullptr)
    {
        g_Debug = new Debug();
    }
}

void AllocateMutex()
{
    if (g_Mutex == nullptr)
    {
        std::unique_ptr<angle::GlobalMutex> newMutex(new angle::GlobalMutex());
        angle::GlobalMutex *expected = nullptr;
        if (g_Mutex.compare_exchange_strong(expected, newMutex.get()))
        {
            newMutex.release();
        }
    }
}

}  // anonymous namespace

thread_local Thread *gCurrentThread = nullptr;

angle::GlobalMutex &GetGlobalMutex()
{
    AllocateMutex();
    return *g_Mutex;
}

Thread *GetCurrentThread()
{
    Thread *current = gCurrentThread;
    return (current ? current : AllocateCurrentThread());
}

Debug *GetDebug()
{
    AllocateDebug();
    return g_Debug;
}

void SetContextCurrent(Thread *thread, gl::Context *context)
{
    ASSERT(gCurrentThread);
    gCurrentThread->setCurrent(context);
    SetContextToAndroidOpenGLTLSSlot(context);
    gl::gCurrentValidContext = context;
}
}  // namespace egl

namespace gl
{
void GenerateContextLostErrorOnContext(Context *context)
{
    if (context && context->isContextLost())
    {
        context->validationError(GL_CONTEXT_LOST, err::kContextLost);
    }
}

void GenerateContextLostErrorOnCurrentGlobalContext()
{
    GenerateContextLostErrorOnContext(GetGlobalContext());
}
}  // namespace gl

#ifdef ANGLE_PLATFORM_WINDOWS
namespace egl
{

namespace
{

void DeallocateCurrentThread()
{
    SafeDelete(gCurrentThread);
}

void DeallocateDebug()
{
    SafeDelete(g_Debug);
}

void DeallocateMutex()
{
    angle::GlobalMutex *mutex = g_Mutex.exchange(nullptr);
    {
        // Wait for the mutex to become released by other threads before deleting.
        std::lock_guard<angle::GlobalMutex> lock(*mutex);
    }
    SafeDelete(mutex);
}

bool InitializeProcess()
{
    ASSERT(g_Debug == nullptr);
    AllocateDebug();
    AllocateMutex();
    return AllocateCurrentThread() != nullptr;
}

void TerminateProcess()
{
    DeallocateDebug();
    DeallocateMutex();
    DeallocateCurrentThread();
}

}  // anonymous namespace

}  // namespace egl

namespace
{
// The following WaitForDebugger code is based on SwiftShader. See:
// https://cs.chromium.org/chromium/src/third_party/swiftshader/src/Vulkan/main.cpp
#    if defined(ANGLE_ENABLE_ASSERTS) && !defined(ANGLE_ENABLE_WINDOWS_UWP)
INT_PTR CALLBACK DebuggerWaitDialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    RECT rect;

    switch (uMsg)
    {
        case WM_INITDIALOG:
            ::GetWindowRect(GetDesktopWindow(), &rect);
            ::SetWindowPos(hwnd, HWND_TOP, rect.right / 2, rect.bottom / 2, 0, 0, SWP_NOSIZE);
            ::SetTimer(hwnd, 1, 100, NULL);
            return TRUE;
        case WM_COMMAND:
            if (LOWORD(wParam) == IDCANCEL)
            {
                ::EndDialog(hwnd, 0);
            }
            break;
        case WM_TIMER:
            if (angle::IsDebuggerAttached())
            {
                ::EndDialog(hwnd, 0);
            }
    }

    return FALSE;
}

void WaitForDebugger(HINSTANCE instance)
{
    if (angle::IsDebuggerAttached())
        return;

    HRSRC dialog = ::FindResourceA(instance, MAKEINTRESOURCEA(IDD_DIALOG1), MAKEINTRESOURCEA(5));
    if (!dialog)
    {
        printf("Error finding wait for debugger dialog. Error %lu.\n", ::GetLastError());
        return;
    }

    DLGTEMPLATE *dialogTemplate = reinterpret_cast<DLGTEMPLATE *>(::LoadResource(instance, dialog));
    ::DialogBoxIndirectA(instance, dialogTemplate, NULL, DebuggerWaitDialogProc);
}
#    else
void WaitForDebugger(HINSTANCE instance) {}
#    endif  // defined(ANGLE_ENABLE_ASSERTS) && !defined(ANGLE_ENABLE_WINDOWS_UWP)
}  // namespace

extern "C" BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID)
{
    switch (reason)
    {
        case DLL_PROCESS_ATTACH:
            if (angle::GetEnvironmentVar("ANGLE_WAIT_FOR_DEBUGGER") == "1")
            {
                WaitForDebugger(instance);
            }
            return static_cast<BOOL>(egl::InitializeProcess());

        case DLL_THREAD_ATTACH:
            return static_cast<BOOL>(egl::AllocateCurrentThread() != nullptr);

        case DLL_THREAD_DETACH:
            egl::DeallocateCurrentThread();
            break;

        case DLL_PROCESS_DETACH:
            egl::TerminateProcess();
            break;
    }

    return TRUE;
}
#endif  // ANGLE_PLATFORM_WINDOWS

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

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