command_buffer_gles2: Implement EGL default Display as a global object

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 545 matching lines @@
                   bool offscreen,
                   const gfx::Size& offscreen_size,
                   const DisallowedFeatures& disallowed_features,
                   const std::vector<int32_t>& attribs) override;
   void Destroy(bool have_context) override;
   void SetSurface(const scoped_refptr<gfx::GLSurface>& surface) override;
   void ProduceFrontBuffer(const Mailbox& mailbox) override;
   bool ResizeOffscreenFrameBuffer(const gfx::Size& size) override;
   void UpdateParentTextureInfo();
   bool MakeCurrent() override;
+  void ReleaseCurrent() override;
   GLES2Util* GetGLES2Util() override { return &util_; }
   gfx::GLContext* GetGLContext() override { return context_.get(); }
   ContextGroup* GetContextGroup() override { return group_.get(); }
   Capabilities GetCapabilities() override;
   void RestoreState(const ContextState* prev_state) override;
 
   void RestoreActiveTexture() const override { state_.RestoreActiveTexture(); }
   void RestoreAllTextureUnitBindings(
       const ContextState* prev_state) const override {
     state_.RestoreAllTextureUnitBindings(prev_state);
@@ skipping 3029 matching lines @@
     RestoreFramebufferBindings();
 
   framebuffer_state_.clear_state_dirty = true;
 
   // Rebind textures if the service ids may have changed.
   RestoreAllExternalTextureBindingsIfNeeded();
 
   return true;
 }
 
+void GLES2DecoderImpl::ReleaseCurrent() {
+  if (!context_.get())
+    return;
+
+  if (WasContextLost()) {
+    LOG(ERROR) << "  GLES2DecoderImpl: Trying to release lost context.";
+    return;
+  }
+
+  context_->ReleaseCurrent(surface_.get());
+}
+
 void GLES2DecoderImpl::ProcessFinishedAsyncTransfers() {
   ProcessPendingReadPixels(false);
   if (engine() && query_manager_.get())
     query_manager_->ProcessPendingTransferQueries();
 }
 
 static void RebindCurrentFramebuffer(
     GLenum target,
     Framebuffer* framebuffer,
     GLuint back_buffer_service_id) {
@@ skipping 501 matching lines @@
        it != texture_to_io_surface_map_.end(); ++it) {
     CFRelease(it->second);
   }
   texture_to_io_surface_map_.clear();
 #endif
 }
 
 void GLES2DecoderImpl::SetSurface(
     const scoped_refptr<gfx::GLSurface>& surface) {
   DCHECK(context_->IsCurrent(NULL));
-  DCHECK(surface_.get());
+  // Surface can be null, but then the client should not use the decoder.
   surface_ = surface;
   RestoreCurrentFramebufferBindings();
 }
 
 void GLES2DecoderImpl::ProduceFrontBuffer(const Mailbox& mailbox) {
   if (!offscreen_saved_color_texture_.get()) {
     LOG(ERROR) << "Called ProduceFrontBuffer on a non-offscreen context";
     return;
   }
   if (!offscreen_saved_color_texture_info_.get()) {
@@ skipping 11507 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu