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// Copyright (c) 2011 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 "content/gpu/gpu_info_collector.h"
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/string_number_conversions.h"
#include "base/string_piece.h"
#include "base/string_split.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_context.h"
namespace {
// This creates an offscreen GL context for gl queries. Returned GLContext
// should be deleted in FinalizeGLContext.
gfx::GLContext* InitializeGLContext() {
if (!gfx::GLContext::InitializeOneOff()) {
LOG(ERROR) << "gfx::GLContext::InitializeOneOff() failed";
return NULL;
}
gfx::GLContext* context = gfx::GLContext::CreateOffscreenGLContext(NULL);
if (context == NULL) {
LOG(ERROR) << "gfx::GLContext::CreateOffscreenGLContext(NULL) failed";
return NULL;
}
if (!context->MakeCurrent()) {
LOG(ERROR) << "gfx::GLContext::MakeCurrent() failed";
context->Destroy();
delete context;
return NULL;
}
return context;
}
// This destroy and delete the GL context.
void FinalizeGLContext(gfx::GLContext** context) {
DCHECK(context);
if (*context) {
(*context)->Destroy();
delete *context;
*context = NULL;
}
}
std::string GetGLString(unsigned int pname) {
const char* gl_string =
reinterpret_cast<const char*>(glGetString(pname));
if (gl_string)
return std::string(gl_string);
return "";
}
// Return a version string in the format of "major.minor".
std::string GetVersionFromString(const std::string& version_string) {
size_t begin = version_string.find_first_of("0123456789");
if (begin != std::string::npos) {
size_t end = version_string.find_first_not_of("01234567890.", begin);
std::string sub_string;
if (end != std::string::npos)
sub_string = version_string.substr(begin, end - begin);
else
sub_string = version_string.substr(begin);
std::vector<std::string> pieces;
base::SplitString(sub_string, '.', &pieces);
if (pieces.size() >= 2)
return pieces[0] + "." + pieces[1];
}
return "";
}
} // namespace anonymous
namespace gpu_info_collector {
bool CollectGraphicsInfoGL(GPUInfo* gpu_info) {
DCHECK(gpu_info);
gfx::GLContext* context = InitializeGLContext();
if (context == NULL)
return false;
gpu_info->gl_renderer = GetGLString(GL_RENDERER);
gpu_info->gl_vendor = GetGLString(GL_VENDOR);
gpu_info->gl_version_string =GetGLString(GL_VERSION);
gpu_info->gl_extensions =GetGLString(GL_EXTENSIONS);
bool validGLVersionInfo = CollectGLVersionInfo(gpu_info);
bool validVideoCardInfo = CollectVideoCardInfo(gpu_info);
bool validDriverInfo = CollectDriverInfoGL(gpu_info);
FinalizeGLContext(&context);
return (validGLVersionInfo && validVideoCardInfo && validDriverInfo);
}
bool CollectGLVersionInfo(GPUInfo* gpu_info) {
DCHECK(gpu_info);
std::string gl_version_string = gpu_info->gl_version_string;
std::string glsl_version_string =
GetGLString(GL_SHADING_LANGUAGE_VERSION);
gpu_info->gl_version = GetVersionFromString(gl_version_string);
std::string glsl_version = GetVersionFromString(glsl_version_string);
gpu_info->pixel_shader_version = glsl_version;
gpu_info->vertex_shader_version = glsl_version;
return true;
}
} // namespace gpu_info_collector
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