Add OzoneGLImpl interface.

ui/ozone/public/gl_ozone.h

+// Copyright 2016 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_OZONE_PUBLIC_GL_OZONE_H_
+#define UI_OZONE_PUBLIC_GL_OZONE_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/gl/gpu_preference.h"
+#include "ui/ozone/ozone_base_export.h"
+
+namespace gl {
+class GLContext;
+class GLShareGroup;
+class GLSurface;
+}
+
+namespace ui {
+
+// Interface that has all of the required methods for an Ozone platform to
+// implement a GL implementation. Functions in gl_factory.h and gl_initializer.h
+// will delegate to functions in this interface.
+class OZONE_BASE_EXPORT GLOzone {

[rjkroege, 2016/08/26 19:55:53]

aside: we will need a VulkanOzone too at some point.

[kylechar, 2016/08/29 15:38:15]

sgtm.

+ public:
+  virtual ~GLOzone() {}
+
+  // Initializes static GL bindings and sets GL implementation.
+  virtual bool InitializeStaticGLBindings(
+      gl::GLImplementation implementation) = 0;
+
+  // Performs any one off initialization for GL implementation.
+  virtual bool InitializeGLOneOffPlatform() = 0;
+
+  // Initializes static debug GL bindings.
+  virtual void InitializeDebugGLBindings() = 0;
+
+  // Clears static GL bindings.
+  virtual void ClearGLBindings() = 0;
+
+  // Returns information about the GL window system binding implementation (eg.
+  // EGL, GLX, WGL). Returns true if the information was retrieved successfully.
+  virtual bool GetGLWindowSystemBindingInfo(
+      gl::GLWindowSystemBindingInfo* info) = 0;
+
+  // Creates a GL context that is compatible with the given surface.
+  // |share_group|, if not null, is a group of contexts which the internally
+  // created OpenGL context shares textures and other resources.
+  virtual scoped_refptr<gl::GLContext> CreateGLContext(
+      gl::GLShareGroup* share_group,
+      gl::GLSurface* compatible_surface,
+      gl::GpuPreference gpu_preference) = 0;
+
+  // Creates a GL surface that renders directly to a view.
+  virtual scoped_refptr<gl::GLSurface> CreateViewGLSurface(
+      gfx::AcceleratedWidget window) = 0;
+
+  // Creates a GL surface that renders directly into a window with surfaceless
+  // semantics. The surface is not backed by any buffers and is used for
+  // overlay-only displays. This will return null if surfaceless mode is
+  // unsupported.
+  virtual scoped_refptr<gl::GLSurface> CreateSurfacelessViewGLSurface(
+      gfx::AcceleratedWidget window) = 0;
+
+  // Creates a GL surface used for offscreen rendering.
+  virtual scoped_refptr<gl::GLSurface> CreateOffscreenGLSurface(
+      const gfx::Size& size) = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_GL_OZONE_H_