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// Copyright (c) 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file contains some useful utilities for the ui/gl classes.
#include "ui/gl/gl_utils.h"
#include "base/debug/alias.h"
#include "base/logging.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_features.h"
#include "ui/gl/gl_switches.h"
#if defined(OS_ANDROID)
#include "base/posix/eintr_wrapper.h"
#include "third_party/libsync/src/include/sync/sync.h"
#endif
#if defined(OS_WIN)
#include "ui/gl/direct_composition_surface_win.h"
#endif
namespace gl {
// Used by chrome://gpucrash and gpu_benchmarking_extension's
// CrashForTesting.
void Crash() {
DVLOG(1) << "GPU: Simulating GPU crash";
// Good bye, cruel world.
volatile int* it_s_the_end_of_the_world_as_we_know_it = nullptr;
*it_s_the_end_of_the_world_as_we_know_it = 0xdead;
}
// Used by chrome://gpuhang.
void Hang() {
DVLOG(1) << "GPU: Simulating GPU hang";
int do_not_delete_me = 0;
for (;;) {
// Do not sleep here. The GPU watchdog timer tracks
// the amount of user time this thread is using and
// it doesn't use much while calling Sleep.
// The following are multiple mechanisms to prevent compilers from
// optimizing out the endless loop. Hope at least one of them works.
base::debug::Alias(&do_not_delete_me);
++do_not_delete_me;
__asm__ volatile("");
}
}
#if defined(OS_ANDROID)
base::ScopedFD MergeFDs(base::ScopedFD a, base::ScopedFD b) {
if (!a.is_valid())
return b;
if (!b.is_valid())
return a;
base::ScopedFD merged(HANDLE_EINTR(sync_merge("", a.get(), b.get())));
if (!merged.is_valid())
LOG(ERROR) << "Failed to merge fences.";
return merged;
}
#endif
bool UsePassthroughCommandDecoder(const base::CommandLine* command_line) {
std::string switch_value;
if (command_line->HasSwitch(switches::kUseCmdDecoder)) {
switch_value = command_line->GetSwitchValueASCII(switches::kUseCmdDecoder);
}
if (switch_value == kCmdDecoderPassthroughName) {
return true;
} else if (switch_value == kCmdDecoderValidatingName) {
return false;
} else {
// Unrecognized or missing switch, use the default.
return base::FeatureList::IsEnabled(
features::kDefaultPassthroughCommandDecoder);
}
}
#if defined(OS_WIN)
// This function is thread safe.
bool AreOverlaysSupportedWin() {
return gl::DirectCompositionSurfaceWin::AreOverlaysSupported();
}
#endif
} // namespace gl
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