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      1 /*
      2  * Copyright 2017 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef GrBackendSemaphore_DEFINED
      9 #define GrBackendSemaphore_DEFINED
     10 
     11 #include "GrTypes.h"
     12 
     13 #include "gl/GrGLTypes.h"
     14 
     15 #ifdef SK_VULKAN
     16 #include "vk/GrVkTypes.h"
     17 #endif
     18 
     19 /**
     20  * Wrapper class for passing into and receiving data from Ganesh about a backend semaphore object.
     21  */
     22 class GrBackendSemaphore {
     23 public:
     24     // For convenience we just set the backend here to OpenGL. The GrBackendSemaphore cannot be used
     25     // until either initGL or initVulkan are called which will set the appropriate GrBackend.
     26     GrBackendSemaphore() : fBackend(kOpenGL_GrBackend), fGLSync(0), fIsInitialized(false) {}
     27 
     28     void initGL(GrGLsync sync) {
     29         fBackend = kOpenGL_GrBackend;
     30         fGLSync = sync;
     31         fIsInitialized = true;
     32     }
     33 
     34 #ifdef SK_VULKAN
     35     void initVulkan(VkSemaphore semaphore) {
     36         fBackend = kVulkan_GrBackend;
     37         fVkSemaphore = semaphore;
     38         fIsInitialized = true;
     39     }
     40 #endif
     41 
     42     GrGLsync glSync() const {
     43         if (!fIsInitialized || kOpenGL_GrBackend != fBackend) {
     44             return 0;
     45         }
     46         return fGLSync;
     47     }
     48 
     49 #ifdef SK_VULKAN
     50     VkSemaphore vkSemaphore() const {
     51         if (!fIsInitialized || kVulkan_GrBackend != fBackend) {
     52             return VK_NULL_HANDLE;
     53         }
     54         return fVkSemaphore;
     55     }
     56 #endif
     57 
     58 private:
     59     GrBackend fBackend;
     60     union {
     61         GrGLsync    fGLSync;
     62 #ifdef SK_VULKAN
     63         VkSemaphore fVkSemaphore;
     64 #endif
     65     };
     66     bool fIsInitialized;
     67 };
     68 
     69 #endif
     70