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// Copyright (c) 2012 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.
#include "ui/gl/gl_implementation.h"
#include <stddef.h>
#include <algorithm>
#include <string>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_gl_api_implementation.h"
#include "ui/gl/gl_version_info.h"
namespace gfx {
namespace {
const struct {
const char* name;
GLImplementation implementation;
} kGLImplementationNamePairs[] = {
{ kGLImplementationDesktopName, kGLImplementationDesktopGL },
{ kGLImplementationOSMesaName, kGLImplementationOSMesaGL },
#if defined(OS_MACOSX)
{ kGLImplementationAppleName, kGLImplementationAppleGL },
#endif
{ kGLImplementationEGLName, kGLImplementationEGLGLES2 },
{ kGLImplementationMockName, kGLImplementationMockGL }
};
typedef std::vector<base::NativeLibrary> LibraryArray;
GLImplementation g_gl_implementation = kGLImplementationNone;
LibraryArray* g_libraries;
GLGetProcAddressProc g_get_proc_address;
void CleanupNativeLibraries(void* unused) {
if (g_libraries) {
// We do not call base::UnloadNativeLibrary() for these libraries as
// unloading libGL without closing X display is not allowed. See
// crbug.com/250813 for details.
delete g_libraries;
g_libraries = NULL;
}
}
}
base::ThreadLocalPointer<GLApi>* g_current_gl_context_tls = NULL;
OSMESAApi* g_current_osmesa_context;
#if defined(OS_WIN)
EGLApi* g_current_egl_context;
WGLApi* g_current_wgl_context;
#elif defined(USE_X11)
EGLApi* g_current_egl_context;
GLXApi* g_current_glx_context;
#elif defined(USE_OZONE)
EGLApi* g_current_egl_context;
#elif defined(OS_ANDROID)
EGLApi* g_current_egl_context;
#endif
GLImplementation GetNamedGLImplementation(const std::string& name) {
for (size_t i = 0; i < arraysize(kGLImplementationNamePairs); ++i) {
if (name == kGLImplementationNamePairs[i].name)
return kGLImplementationNamePairs[i].implementation;
}
return kGLImplementationNone;
}
const char* GetGLImplementationName(GLImplementation implementation) {
for (size_t i = 0; i < arraysize(kGLImplementationNamePairs); ++i) {
if (implementation == kGLImplementationNamePairs[i].implementation)
return kGLImplementationNamePairs[i].name;
}
return "unknown";
}
void SetGLImplementation(GLImplementation implementation) {
g_gl_implementation = implementation;
}
GLImplementation GetGLImplementation() {
return g_gl_implementation;
}
bool HasDesktopGLFeatures() {
return kGLImplementationDesktopGL == g_gl_implementation ||
kGLImplementationDesktopGLCoreProfile == g_gl_implementation ||
kGLImplementationOSMesaGL == g_gl_implementation ||
kGLImplementationAppleGL == g_gl_implementation;
}
void AddGLNativeLibrary(base::NativeLibrary library) {
DCHECK(library);
if (!g_libraries) {
g_libraries = new LibraryArray;
base::AtExitManager::RegisterCallback(CleanupNativeLibraries, NULL);
}
g_libraries->push_back(library);
}
void UnloadGLNativeLibraries() {
CleanupNativeLibraries(NULL);
}
void SetGLGetProcAddressProc(GLGetProcAddressProc proc) {
DCHECK(proc);
g_get_proc_address = proc;
}
void* GetGLProcAddress(const char* name) {
DCHECK(g_gl_implementation != kGLImplementationNone);
if (g_libraries) {
for (size_t i = 0; i < g_libraries->size(); ++i) {
void* proc = base::GetFunctionPointerFromNativeLibrary((*g_libraries)[i],
name);
if (proc)
return proc;
}
}
if (g_get_proc_address) {
void* proc = g_get_proc_address(name);
if (proc)
return proc;
}
return NULL;
}
void InitializeNullDrawGLBindings() {
// This is platform independent, so it does not need to live in a platform
// specific implementation file.
InitializeNullDrawGLBindingsGL();
}
bool HasInitializedNullDrawGLBindings() {
return HasInitializedNullDrawGLBindingsGL();
}
std::string FilterGLExtensionList(
const char* extensions,
const std::vector<std::string>& disabled_extensions) {
if (extensions == NULL)
return "";
std::vector<std::string> extension_vec = base::SplitString(
extensions, " ", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
auto is_disabled = [&disabled_extensions](const std::string& ext) {
return std::find(disabled_extensions.begin(), disabled_extensions.end(),
ext) != disabled_extensions.end();
};
extension_vec.erase(
std::remove_if(extension_vec.begin(), extension_vec.end(), is_disabled),
extension_vec.end());
return base::JoinString(extension_vec, " ");
}
DisableNullDrawGLBindings::DisableNullDrawGLBindings() {
initial_enabled_ = SetNullDrawGLBindingsEnabledGL(false);
}
DisableNullDrawGLBindings::~DisableNullDrawGLBindings() {
SetNullDrawGLBindingsEnabledGL(initial_enabled_);
}
GLWindowSystemBindingInfo::GLWindowSystemBindingInfo()
: direct_rendering(true) {}
std::string GetGLExtensionsFromCurrentContext() {
if (WillUseGLGetStringForExtensions()) {
return reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
}
std::vector<std::string> exts;
GLint num_extensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
for (GLint i = 0; i < num_extensions; ++i) {
const char* extension = reinterpret_cast<const char*>(
glGetStringi(GL_EXTENSIONS, i));
DCHECK(extension != NULL);
exts.push_back(extension);
}
return base::JoinString(exts, " ");
}
bool WillUseGLGetStringForExtensions() {
const char* version_str =
reinterpret_cast<const char*>(glGetString(GL_VERSION));
unsigned major_version, minor_version;
bool is_es, is_es3;
gfx::GLVersionInfo::ParseVersionString(
version_str, &major_version, &minor_version, &is_es, &is_es3);
return is_es || major_version < 3;
}
} // namespace gfx
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