command_buffer_gles2: Implement EGL default Display as a global object

gpu/gles2_conform_support/egl/context.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_
-#define GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_
-
-#include <EGL/egl.h>
-#include <stddef.h>
-#include <stdint.h>
+#ifndef GPU_GLES2_CONFORM_TEST_CONTEXT_H_
+#define GPU_GLES2_CONFORM_TEST_CONTEXT_H_
 
 #include <memory>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gpu_control.h"
 #include "gpu/command_buffer/service/command_buffer_service.h"
 #include "gpu/command_buffer/service/command_executor.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/config/gpu_driver_bug_workarounds.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_context.h"
+#include "ui/gl/gl_context.h"
 #include "ui/gl/gl_surface.h"
+#include "ui/gl/gl_surface.h"
+#include <EGL/egl.h>
 
 namespace gpu {
-class CommandBufferService;
-class GpuControl;
-class CommandExecutor;
 class TransferBuffer;
 class TransferBufferManagerInterface;
 
 namespace gles2 {
 class GLES2CmdHelper;
-class GLES2Implementation;
+class GLES2Interface;
 }  // namespace gles2
 }  // namespace gpu
 
 namespace egl {
+class Display;
+class Surface;
+class Config;
 
-class Config;
-class Surface;
+class Context : public base::RefCountedThreadSafe<Context>,
+                private gpu::GpuControl {
+ public:
+  Context(Display* display, const Config* config);
+  bool is_current_in_some_thread() const { return is_current_in_some_thread_; }
+  void set_is_current_in_some_thread(bool flag) {
+    is_current_in_some_thread_ = flag;
+  }
+  void MarkDestroyed();
+  bool SwapBuffers(Surface* current_surface);
 
-class Display : private gpu::GpuControl {
- public:
-  explicit Display(EGLNativeDisplayType display_id);
-  ~Display() override;
+  static bool MakeCurrent(Context* current_context,
+                          Surface* current_surface,
+                          Context* new_context,
+                          Surface* new_surface);
 
-  void SetCreateOffscreen(int width, int height) {
-    create_offscreen_ = true;
-    create_offscreen_width_ = width;
-    create_offscreen_height_ = height;
-  }
-
-  bool is_initialized() const { return is_initialized_; }
-  bool Initialize();
-
-  // Config routines.
-  bool IsValidConfig(EGLConfig config);
-  bool ChooseConfigs(
-      EGLConfig* configs, EGLint config_size, EGLint* num_config);
-  bool GetConfigs(EGLConfig* configs, EGLint config_size, EGLint* num_config);
-  bool GetConfigAttrib(EGLConfig config, EGLint attribute, EGLint* value);
-
-  // Surface routines.
-  bool IsValidNativeWindow(EGLNativeWindowType win);
-  bool IsValidSurface(EGLSurface surface);
-  EGLSurface CreateWindowSurface(EGLConfig config,
-                                 EGLNativeWindowType win,
-                                 const EGLint* attrib_list);
-  void DestroySurface(EGLSurface surface);
-  void SwapBuffers(EGLSurface surface);
-
-  // Context routines.
-  bool IsValidContext(EGLContext ctx);
-  EGLContext CreateContext(EGLConfig config,
-                           EGLContext share_ctx,
-                           const EGLint* attrib_list);
-  void DestroyContext(EGLContext ctx);
-  bool MakeCurrent(EGLSurface draw, EGLSurface read, EGLContext ctx);
+  static bool ValidateAttributeList(const EGLint* attrib_list);
 
   // GpuControl implementation.
   void SetGpuControlClient(gpu::GpuControlClient*) override;
   gpu::Capabilities GetCapabilities() override;
   int32_t CreateImage(ClientBuffer buffer,
                       size_t width,
                       size_t height,
                       unsigned internalformat) override;
   void DestroyImage(int32_t id) override;
   int32_t CreateGpuMemoryBufferImage(size_t width,
                                      size_t height,
                                      unsigned internalformat,
                                      unsigned usage) override;
   void SignalQuery(uint32_t query, const base::Closure& callback) override;
   void SetLock(base::Lock*) override;
   void EnsureWorkVisible() override;
   gpu::CommandBufferNamespace GetNamespaceID() const override;
   gpu::CommandBufferId GetCommandBufferID() const override;
   int32_t GetExtraCommandBufferData() const override;
   uint64_t GenerateFenceSyncRelease() override;
   bool IsFenceSyncRelease(uint64_t release) override;
   bool IsFenceSyncFlushed(uint64_t release) override;
   bool IsFenceSyncFlushReceived(uint64_t release) override;
   void SignalSyncToken(const gpu::SyncToken& sync_token,
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) override;
 
+  // Called by ThreadState to set the needed global variables when this context
+  // is current.
+  void ApplyCurrentContext(gfx::GLSurface* current_surface);
+  static void ApplyContextReleased();
+
  private:
-  EGLNativeDisplayType display_id_;
+  friend class base::RefCountedThreadSafe<Context>;
+  ~Context() override;
+  bool CreateService(gfx::GLSurface* gl_surface);
+  void DestroyService();
+  // Returns true if the object has GL service, either a working one or one
+  // that has lost its GL context.
+  bool HasService() const;
+  void MarkServiceContextLost();
+  bool WasServiceContextLost() const;
+  bool IsCompatibleSurface(Surface* surface) const;
+  bool Flush(gfx::GLSurface* gl_surface);
 
+  Display* display_;
+  const Config* config_;
+  bool is_current_in_some_thread_;
+  bool is_destroyed_;
   gpu::GpuPreferences gpu_preferences_;
   const gpu::GpuDriverBugWorkarounds gpu_driver_bug_workarounds_;
-  bool is_initialized_;
-
-  bool create_offscreen_;
-  int create_offscreen_width_;
-  int create_offscreen_height_;
-  uint64_t next_fence_sync_release_;
-
-  scoped_refptr<gpu::TransferBufferManagerInterface> transfer_buffer_manager_;
   std::unique_ptr<gpu::CommandBufferService> command_buffer_;
-  std::unique_ptr<gpu::CommandExecutor> executor_;
+  std::unique_ptr<gpu::gles2::GLES2CmdHelper> gles2_cmd_helper_;
   std::unique_ptr<gpu::gles2::GLES2Decoder> decoder_;
-  scoped_refptr<gfx::GLContext> gl_context_;
-  scoped_refptr<gfx::GLSurface> gl_surface_;
-  std::unique_ptr<gpu::gles2::GLES2CmdHelper> gles2_cmd_helper_;
+  std::unique_ptr<gpu::CommandExecutor> command_executor_;
   std::unique_ptr<gpu::TransferBuffer> transfer_buffer_;
 
-  // TODO(alokp): Support more than one config, surface, and context.
-  std::unique_ptr<Config> config_;
-  std::unique_ptr<Surface> surface_;
-  std::unique_ptr<gpu::gles2::GLES2Implementation> context_;
+  scoped_refptr<gfx::GLContext> gl_context_;
 
-  DISALLOW_COPY_AND_ASSIGN(Display);
+  std::unique_ptr<gpu::gles2::GLES2Interface> client_gl_context_;
+  DISALLOW_COPY_AND_ASSIGN(Context);
 };
 
 }  // namespace egl
 
-#endif  // GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_
+#endif  // GPU_GLES2_CONFORM_TEST_CONTEXT_H_