Use 3D graphics context shareResources flag to decide whether a context should share resources.

content/renderer/gpu/renderer_gl_context.h

 // 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.
 
 // This API is consistent with other OpenGL setup APIs like window's WGL
 // and pepper's PGL. This API is used to manage OpenGL RendererGLContexts in the
 // Chrome renderer process in a way that is consistent with other platforms.
 
 #ifndef CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
 #define CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_
@@ skipping 17 matching lines @@
 namespace gles2 {
 class GLES2CmdHelper;
 class GLES2Implementation;
 }
 }
 
 class RendererGLContext : public base::SupportsWeakPtr<RendererGLContext> {
  public:
   // These are the same error codes as used by EGL.
   enum Error {
-    SUCCESS             = 0x3000,
-    NOT_INITIALIZED     = 0x3001,
-    BAD_ATTRIBUTE       = 0x3004,
-    BAD_RendererGLContext         = 0x3006,
-    CONTEXT_LOST        = 0x300E
+    SUCCESS               = 0x3000,
+    NOT_INITIALIZED       = 0x3001,
+    BAD_ATTRIBUTE         = 0x3004,
+    BAD_RendererGLContext = 0x3006,
+    CONTEXT_LOST          = 0x300E
   };
 
-  // RendererGLContext configuration attributes. These are the same as used by
-  // EGL. Attributes are matched using a closest fit algorithm.
+  // RendererGLContext configuration attributes. Those in the 16-bit range are
+  // the same as used by EGL. Those outside the 16-bit range are unique to
+  // Chromium. Attributes are matched using a closest fit algorithm.
   enum Attribute {
-    ALPHA_SIZE     = 0x3021,
-    BLUE_SIZE      = 0x3022,
-    GREEN_SIZE     = 0x3023,
-    RED_SIZE       = 0x3024,
-    DEPTH_SIZE     = 0x3025,
-    STENCIL_SIZE   = 0x3026,
-    SAMPLES        = 0x3031,
-    SAMPLE_BUFFERS = 0x3032,
-    HEIGHT         = 0x3056,
-    WIDTH          = 0x3057,
-    NONE           = 0x3038  // Attrib list = terminator
+    ALPHA_SIZE                = 0x3021,
+    BLUE_SIZE                 = 0x3022,
+    GREEN_SIZE                = 0x3023,
+    RED_SIZE                  = 0x3024,
+    DEPTH_SIZE                = 0x3025,
+    STENCIL_SIZE              = 0x3026,
+    SAMPLES                   = 0x3031,
+    SAMPLE_BUFFERS            = 0x3032,
+    HEIGHT                    = 0x3056,
+    WIDTH                     = 0x3057,
+    NONE                      = 0x3038,  // Attrib list = terminator
+    SHARE_RESOURCES           = 0x10000,
+    BIND_GENERATES_RESOURCES  = 0x10001
   };
 
   // Reasons that a lost context might have been provoked.
   enum ContextLostReason {
     // This context definitely provoked the loss of context.
     kGuilty,
 
     // This context definitely did not provoke the loss of context.
     kInnocent,
 
@@ skipping 24 matching lines @@
   // allocate both fake PluginWindowHandles and NativeViewIds and map
   // from fake NativeViewIds to PluginWindowHandles, but this seems like
   // unnecessary complexity at the moment.
   //
   // The render_view_id is currently also only used on Mac OS X.
   // TODO(kbr): clean up the arguments to this function and make them
   // more cross-platform.
   static RendererGLContext* CreateViewContext(
       GpuChannelHost* channel,
       int render_view_id,
-      bool share_resources,
       RendererGLContext* share_group,
       const char* allowed_extensions,
       const int32* attrib_list,
       const GURL& active_arl);
 
 #if defined(OS_MACOSX)
   // On Mac OS X only, view RendererGLContexts actually behave like offscreen
   // RendererGLContexts, and require an explicit resize operation which is
   // slightly different from that of offscreen RendererGLContexts.
   void ResizeOnscreen(const gfx::Size& size);
 #endif
 
   // Create a RendererGLContext that renders to an offscreen frame buffer. If
   // parent is not NULL, that RendererGLContext can access a copy of the created
   // RendererGLContext's frame buffer that is updated every time SwapBuffers is
   // called. It is not as general as shared RendererGLContexts in other
   // implementations of OpenGL. If parent is not NULL, it must be used on the
   // same thread as the parent. A child RendererGLContext may not outlive its
   // parent.  attrib_list must be NULL or a NONE-terminated list of
   // attribute/value pairs.
   static RendererGLContext* CreateOffscreenContext(
       GpuChannelHost* channel,
       const gfx::Size& size,
-      bool share_resources,
       RendererGLContext* share_group,
       const char* allowed_extensions,
       const int32* attrib_list,
       const GURL& active_url);
 
   // Sets the parent context. If any parent textures have been created for
   // another parent, it is important to delete them before changing the parent.
   bool SetParent(RendererGLContext* parent);
 
   // Resize an offscreen frame buffer. The resize occurs on the next call to
@@ skipping 48 matching lines @@
   bool IsCommandBufferContextLost();
 
   CommandBufferProxy* GetCommandBufferProxy();
 
  private:
   explicit RendererGLContext(GpuChannelHost* channel);
 
   bool Initialize(bool onscreen,
                   int render_view_id,
                   const gfx::Size& size,
-                  bool share_resources,
-                  bool bind_generates_resource,
                   RendererGLContext* share_group,
                   const char* allowed_extensions,
                   const int32* attrib_list,
                   const GURL& active_url);
   void Destroy();
 
   void OnSwapBuffers();
   void OnContextLost();
 
   scoped_refptr<GpuChannelHost> channel_;
   base::WeakPtr<RendererGLContext> parent_;
   scoped_ptr<Callback0::Type> swap_buffers_callback_;
   scoped_ptr<Callback1<ContextLostReason>::Type> context_lost_callback_;
   uint32 parent_texture_id_;
   CommandBufferProxy* command_buffer_;
   gpu::gles2::GLES2CmdHelper* gles2_helper_;
   int32 transfer_buffer_id_;
   gpu::gles2::GLES2Implementation* gles2_implementation_;
   gfx::Size size_;
   Error last_error_;
   int frame_number_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererGLContext);
 };
 
 #endif  // CONTENT_RENDERER_GPU_RENDERER_GL_CONTEXT_H_