Collect as much GPU information as possible without creating a GL/D3D context...

chrome/gpu/gpu_info_collector_mac.mm

 // Copyright (c) 2006-2010 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 "chrome/gpu/gpu_info_collector.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "base/sys_string_conversions.h"
 #include "app/gfx/gl/gl_bindings.h"
@@ skipping 34 matching lines @@
 
 bool CollectGraphicsInfo(GPUInfo* gpu_info) {
   DCHECK(gpu_info);
 
   gpu_info->SetCanLoseContext(
       gfx::GetGLImplementation() == gfx::kGLImplementationEGLGLES2);
   gpu_info->SetLevel(GPUInfo::kComplete);
   return CollectGraphicsInfoGL(gpu_info);
 }
 
+bool CollectPreliminaryGraphicsInfo(GPUInfo* gpu_info) {
+  DCHECK(gpu_info);
+
+  gpu_info->SetLevel(GPUInfo::kPartial);
+
+  bool rt = true;
+  if (!CollectVideoCardInfo(gpu_info))
+    rt = false;
+
+  return rt;
+}
+
 bool CollectVideoCardInfo(GPUInfo* gpu_info) {
   DCHECK(gpu_info);
 
-  if (gfx::GetGLImplementation() != gfx::kGLImplementationDesktopGL)
-    return false;
-
   UInt32 vendor_id = 0, device_id = 0;
   io_registry_entry_t dsp_port = CGDisplayIOServicePort(kCGDirectMainDisplay);
   CFTypeRef vendor_id_ref = SearchPortForProperty(dsp_port, CFSTR("vendor-id"));
   if (vendor_id_ref) {
     vendor_id = IntValueOfCFData((CFDataRef)vendor_id_ref);
     CFRelease(vendor_id_ref);
   }
   CFTypeRef device_id_ref = SearchPortForProperty(dsp_port, CFSTR("device-id"));
   if (device_id_ref) {
     device_id = IntValueOfCFData((CFDataRef)device_id_ref);
@@ skipping 13 matching lines @@
   // Use some jiggery-pokery to turn that utf8 string into a std::wstring.
   std::string gl_version_string = gpu_info->gl_version_string();
   size_t pos = gl_version_string.find_last_of('-');
   if (pos == std::string::npos)
     return false;
   gpu_info->SetDriverInfo("", gl_version_string.substr(pos + 1));
   return true;
 }
 
 }  // namespace gpu_info_collector