mojo: Convert gles2 to the new thunking system

mojo/public/platform/native/gles2_thunks.h

+// Copyright 2014 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 MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_
+#define MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_
+
+#include <stddef.h>
+
+#include "mojo/public/c/gles2/gles2.h"
+
+// Structure used to bind the interface which manipulates GLES2 surfaces to a
+// DSO to theose of the embedder.
+//
+// This is the ABI between the embedder and the DSO. It can only have new
+// functions added to the end. No other changes are supported.
+#pragma pack(push, 8)
+struct MojoGLES2ControlThunks {
+  size_t size;  // Should be set to sizeof(MojoGLES2ControlThunks).
+
+  void (*GLES2Initialize)(const MojoAsyncWaiter* async_waiter);
+  void (*GLES2Terminate)();
+  MojoGLES2Context (*GLES2CreateContext)(
+      MojoHandle handle,
+      MojoGLES2ContextLost lost_callback,
+      void* closure);
+  void (*GLES2DestroyContext)(MojoGLES2Context context);
+  void (*GLES2MakeCurrent)(MojoGLES2Context context);
+  void (*GLES2SwapBuffers)();
+
+  // TODO(piman): We shouldn't have to leak these 2 interfaces, especially in a
+  // type-unsafe way.
+  void* (*GLES2GetGLES2Interface)(MojoGLES2Context context);
+  void* (*GLES2GetContextSupport)(MojoGLES2Context context);
+};
+#pragma pack(pop)
+
+// Intended to be called from the embedder. Returns an object initialized to
+// contain pointers to each of the embedder's MojoGLES2ControlThunks functions.
+inline MojoGLES2ControlThunks MojoMakeGLES2ControlThunks() {
+  MojoGLES2ControlThunks gles2_control_thunks = {
+    sizeof(MojoGLES2ControlThunks),
+    MojoGLES2Initialize,
+    MojoGLES2Terminate,
+    MojoGLES2CreateContext,
+    MojoGLES2DestroyContext,
+    MojoGLES2MakeCurrent,
+    MojoGLES2SwapBuffers,
+    MojoGLES2GetGLES2Interface,
+    MojoGLES2GetContextSupport
+  };
+
+  return gles2_control_thunks;
+}
+
+// Use this type for the function found by dynamically discovering it in
+// a DSO linked with mojo_system. For example:
+// MojoSetGLES2ControlThunksFn mojo_set_gles2_control_thunks_fn =
+//     reinterpret_cast<MojoSetGLES2ControlThunksFn>(
+//         app_library.GetFunctionPointer("MojoSetGLES2ControlThunks"));
+// The expected size of |gles2_control_thunks| is returned.
+// The contents of |gles2_control_thunks| are copied.
+typedef size_t (*MojoSetGLES2ControlThunksFn)(
+    const MojoGLES2ControlThunks* gles2_control_thunks);
+
+// -----------------------------------------------------------------------------
+
+// Like MojoGLES2ControlThunks, but specifies the frozen GLES2 API. Separated
+// out as MojoGLES2ControlThunks may be modified and added to, but this
+// interface is frozen.
+#pragma pack(push, 8)
+struct MojoGLES2ImplThunks {
+  size_t size;  // Should be set to sizeof(MojoGLES2ImplThunks).
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType (*Function) PARAMETERS;
+#include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#undef VISIT_GL_CALL
+};
+#pragma pack(pop)
+
+// Intended to be called from the embedder to get the embedder's implementation
+// of GLES2.
+inline MojoGLES2ImplThunks MojoMakeGLES2ImplThunks() {
+  MojoGLES2ImplThunks gles2_impl_thunks = {
+    sizeof(MojoGLES2ImplThunks),
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+    gl##Function,
+#include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#undef VISIT_GL_CALL
+  };
+
+  return gles2_impl_thunks;
+}
+
+// Use this type for the function found by dynamically discovering it in
+// a DSO linked with mojo_system. For example:
+// MojoSetGLES2ImplThunksFn mojo_set_gles2_impl_thunks_fn =
+//     reinterpret_cast<MojoSetGLES2ImplThunksFn>(
+//         app_library.GetFunctionPointer("MojoSetGLES2ImplThunks"));
+// The expected size of |gles2_impl_thunks| is returned.
+// The contents of |gles2_impl_thunks| are copied.
+typedef size_t (*MojoSetGLES2ImplThunksFn)(
+    const MojoGLES2ImplThunks* gles2_impl_thunks);
+
+#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_