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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/init/gl_factory.h"
#include <algorithm>
#include <optional>
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_util.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "ui/gl/gl_features.h"
#include "ui/gl/gl_share_group.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_utils.h"
#include "ui/gl/init/gl_initializer.h"
#include "ui/gl/startup_trace.h"
#if BUILDFLAG(IS_OZONE)
#include "ui/base/ui_base_features.h"
#include "ui/ozone/public/ozone_platform.h"
#endif
namespace gl {
namespace init {
namespace {
GLImplementationParts GetRequestedGLImplementation() {
const base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
std::string requested_implementation_gl_name =
cmd->GetSwitchValueASCII(switches::kUseGL);
// If --use-angle was specified but --use-gl was not, assume --use-gl=angle
if (cmd->HasSwitch(switches::kUseANGLE) &&
!cmd->HasSwitch(switches::kUseGL)) {
requested_implementation_gl_name = kGLImplementationANGLEName;
}
if (requested_implementation_gl_name == kGLImplementationDisabledName) {
return GLImplementationParts(kGLImplementationDisabled);
}
std::vector<GLImplementationParts> allowed_impls =
GetAllowedGLImplementations();
// If the passthrough command decoder is enabled, put ANGLE first if allowed
if (UsePassthroughCommandDecoder(cmd)) {
std::vector<GLImplementationParts> angle_impls = {};
bool software_gl_in_allow_list = false;
auto iter = allowed_impls.begin();
while (iter != allowed_impls.end()) {
if ((*iter) == GetSoftwareGLImplementation()) {
software_gl_in_allow_list = true;
allowed_impls.erase(iter);
} else if (iter->gl == kGLImplementationEGLANGLE) {
angle_impls.emplace_back(*iter);
allowed_impls.erase(iter);
} else {
iter++;
}
}
allowed_impls.insert(allowed_impls.begin(), angle_impls.begin(),
angle_impls.end());
// Insert software implementations at the end, after all other hardware
// implementations. If SwiftShader is not allowed as a fallback, don't
// re-insert it.
if (software_gl_in_allow_list && features::IsSwiftShaderAllowed(cmd)) {
allowed_impls.emplace_back(GetSoftwareGLImplementation());
}
}
if (allowed_impls.empty()) {
LOG(ERROR) << "List of allowed GL implementations is empty.";
return GLImplementationParts(kGLImplementationNone);
}
std::optional<GLImplementationParts> impl_from_cmdline =
GetRequestedGLImplementationFromCommandLine(cmd);
// The default implementation is always the first one in list.
if (!impl_from_cmdline)
return allowed_impls[0];
// Allow software GL if explicitly requested by command line, even if it's not
// in the allowed_impls list.
if (IsSoftwareGLImplementation(*impl_from_cmdline))
return *impl_from_cmdline;
if (impl_from_cmdline->IsAllowed(allowed_impls))
return *impl_from_cmdline;
std::vector<std::string> allowed_impl_strs;
for (const auto& allowed_impl : allowed_impls) {
allowed_impl_strs.push_back(allowed_impl.ToString());
}
LOG(ERROR) << "Requested GL implementation " << impl_from_cmdline->ToString()
<< " not found in allowed implementations: ["
<< base::JoinString(allowed_impl_strs, ",") << "].";
return GLImplementationParts(kGLImplementationNone);
}
GLDisplay* InitializeGLOneOffPlatformHelper(bool init_extensions,
gl::GpuPreference gpu_preference) {
TRACE_EVENT1("gpu,startup", "gl::init::InitializeGLOneOffPlatformHelper",
"init_extensions", init_extensions);
GPU_STARTUP_TRACE_EVENT("gl::init::InitializeGLOneOffPlatformHelper");
const base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
bool disable_gl_drawing = cmd->HasSwitch(switches::kDisableGLDrawingForTests);
return InitializeGLOneOffPlatformImplementation(
disable_gl_drawing, init_extensions, gpu_preference);
}
} // namespace
GLDisplay* InitializeGLOneOff(gl::GpuPreference gpu_preference) {
GPU_STARTUP_TRACE_EVENT("gl::init::InitializeOneOff");
if (!InitializeStaticGLBindingsOneOff())
return nullptr;
if (GetGLImplementation() == kGLImplementationDisabled) {
return GetDefaultDisplayEGL();
}
return InitializeGLOneOffPlatformHelper(true, gpu_preference);
}
GLDisplay* InitializeGLNoExtensionsOneOff(bool init_bindings,
gl::GpuPreference gpu_preference) {
TRACE_EVENT1("gpu,startup", "gl::init::InitializeNoExtensionsOneOff",
"init_bindings", init_bindings);
GPU_STARTUP_TRACE_EVENT("gl::init::InitializeNoExtensionsOneOff");
if (init_bindings) {
if (!InitializeStaticGLBindingsOneOff())
return nullptr;
if (GetGLImplementation() == kGLImplementationDisabled) {
return GetDefaultDisplayEGL();
}
}
return InitializeGLOneOffPlatformHelper(false, gpu_preference);
}
bool InitializeStaticGLBindingsOneOff() {
DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
GPU_STARTUP_TRACE_EVENT("gl::init::InitializeStaticGLBindingsOneOff");
GLImplementationParts impl = GetRequestedGLImplementation();
if (impl.gl == kGLImplementationDisabled) {
SetGLImplementation(kGLImplementationDisabled);
return true;
} else if (impl.gl == kGLImplementationNone) {
return false;
}
return InitializeStaticGLBindingsImplementation(impl);
}
bool InitializeStaticGLBindingsImplementation(GLImplementationParts impl) {
if (!InitializeStaticGLBindings(impl)) {
ShutdownGL(nullptr, /*due_to_fallback*/ false);
return false;
}
return true;
}
GLDisplay* InitializeGLOneOffPlatformImplementation(
bool disable_gl_drawing,
bool init_extensions,
gl::GpuPreference gpu_preference) {
GLDisplay* display = InitializeGLOneOffPlatform(gpu_preference);
bool initialized = !!display;
if (!initialized) {
DVLOG(1) << "Initialization failed. Attempting to initialize default "
"GLDisplayEGL.";
RemoveGpuPreferenceEGL(gpu_preference);
display = InitializeGLOneOffPlatform(gl::GpuPreference::kDefault);
initialized = !!display;
}
if (initialized && init_extensions) {
initialized = InitializeExtensionSettingsOneOffPlatform(display);
}
if (!initialized) {
ShutdownGL(display, false);
return nullptr;
}
DVLOG(1) << "Using " << GetGLImplementationGLName(GetGLImplementationParts())
<< " GL implementation.";
SetNullDrawGLBindings(disable_gl_drawing);
return display;
}
GLDisplay* GetOrInitializeGLOneOffPlatformImplementation(
bool fallback_to_software_gl,
bool disable_gl_drawing,
bool init_extensions,
gl::GpuPreference gpu_preference) {
gl::GLDisplay* display = gl::GetDisplay(gpu_preference);
DCHECK(display);
if (display->IsInitialized()) {
return display;
}
display = gl::init::InitializeGLOneOffPlatformImplementation(
/*disable_gl_drawing=*/false, /*init_extensions=*/true,
/*gpu_preference=*/gpu_preference);
return display;
}
void ShutdownGL(GLDisplay* display, bool due_to_fallback) {
ShutdownGLPlatform(display);
UnloadGLNativeLibraries(due_to_fallback);
SetGLImplementation(kGLImplementationNone);
}
} // namespace init
} // namespace gl
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