Get real GPU memory values on NV+Linux and OS X

ui/gl/gl_context.h

 // 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.
 
 #ifndef UI_GL_GL_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 32 matching lines @@
 
   // Get the underlying platform specific GL context "handle".
   virtual void* GetHandle() = 0;
 
   // Set swap interval. This context must be current.
   virtual void SetSwapInterval(int interval) = 0;
 
   // Returns space separated list of extensions. The context must be current.
   virtual std::string GetExtensions();
 
+  // Returns in bytes the total amount of GPU memory for the GPU which this
+  // context is currently rendering on. Returns false if no extension exists
+  // to get the exact amount of GPU memory.
+  virtual bool GetTotalGpuMemory(size_t& bytes);

[Ken Russell (switch to Gerrit), 2012/09/20 06:47:23]

Google C++ style guide disallows mutable reference arguments. Use size_t*
instead. See http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml .

[ccameron, 2012/09/20 21:22:42]

Fixed.

+
   // Returns whether the current context supports the named extension. The
   // context must be current.
   bool HasExtension(const char* name);
 
   GLShareGroup* share_group();
 
   // Create a GL context that is compatible with the given surface.
   // |share_group|, if non-NULL, is a group of contexts which the
   // internally created OpenGL context shares textures and other resources.
   static scoped_refptr<GLContext> CreateGLContext(
@@ skipping 22 matching lines @@
   friend class base::RefCounted<GLContext>;
 
   scoped_refptr<GLShareGroup> share_group_;
 
   DISALLOW_COPY_AND_ASSIGN(GLContext);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_CONTEXT_H_