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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_
      6 #define MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_
      7 
      8 #include <stddef.h>
      9 
     10 #include "mojo/public/c/gles2/gles2.h"
     11 
     12 // Structure used to bind the interface which manipulates GLES2 surfaces to a
     13 // DSO to theose of the embedder.
     14 //
     15 // This is the ABI between the embedder and the DSO. It can only have new
     16 // functions added to the end. No other changes are supported.
     17 #pragma pack(push, 8)
     18 struct MojoGLES2ControlThunks {
     19   size_t size;  // Should be set to sizeof(MojoGLES2ControlThunks).
     20 
     21   MojoGLES2Context (*GLES2CreateContext)(MojoHandle handle,
     22                                          MojoGLES2ContextLost lost_callback,
     23                                          void* closure,
     24                                          const MojoAsyncWaiter* async_waiter);
     25   void (*GLES2DestroyContext)(MojoGLES2Context context);
     26   void (*GLES2MakeCurrent)(MojoGLES2Context context);
     27   void (*GLES2SwapBuffers)();
     28 
     29   // TODO(piman): We shouldn't have to leak these 2 interfaces, especially in a
     30   // type-unsafe way.
     31   void* (*GLES2GetGLES2Interface)(MojoGLES2Context context);
     32   void* (*GLES2GetContextSupport)(MojoGLES2Context context);
     33 };
     34 #pragma pack(pop)
     35 
     36 // Intended to be called from the embedder. Returns an object initialized to
     37 // contain pointers to each of the embedder's MojoGLES2ControlThunks functions.
     38 inline MojoGLES2ControlThunks MojoMakeGLES2ControlThunks() {
     39   MojoGLES2ControlThunks gles2_control_thunks = {
     40     sizeof(MojoGLES2ControlThunks),
     41     MojoGLES2CreateContext,
     42     MojoGLES2DestroyContext,
     43     MojoGLES2MakeCurrent,
     44     MojoGLES2SwapBuffers,
     45     MojoGLES2GetGLES2Interface,
     46     MojoGLES2GetContextSupport
     47   };
     48 
     49   return gles2_control_thunks;
     50 }
     51 
     52 // Use this type for the function found by dynamically discovering it in
     53 // a DSO linked with mojo_system. For example:
     54 // MojoSetGLES2ControlThunksFn mojo_set_gles2_control_thunks_fn =
     55 //     reinterpret_cast<MojoSetGLES2ControlThunksFn>(
     56 //         app_library.GetFunctionPointer("MojoSetGLES2ControlThunks"));
     57 // The expected size of |gles2_control_thunks| is returned.
     58 // The contents of |gles2_control_thunks| are copied.
     59 typedef size_t (*MojoSetGLES2ControlThunksFn)(
     60     const MojoGLES2ControlThunks* gles2_control_thunks);
     61 
     62 #endif  // MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_THUNKS_H_
     63