| // Copyright 2017 The Fuchsia 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 LIB_ESCHER_RESOURCES_WAITABLE_RESOURCE_H_ |
| #define LIB_ESCHER_RESOURCES_WAITABLE_RESOURCE_H_ |
| |
| #include "lib/escher/renderer/semaphore.h" |
| #include "lib/escher/resources/resource.h" |
| |
| namespace escher { |
| |
| // WaitableResource is a base class for resources that can have an associated |
| // "wait semaphore"; if non-null, it will be applied to the next CommandBuffer |
| // submission. |
| class WaitableResource : public Resource { |
| public: |
| static const ResourceTypeInfo kTypeInfo; |
| const ResourceTypeInfo& type_info() const override { return kTypeInfo; } |
| |
| // TODO: eventually make these private, callable only by friends. |
| void SetWaitSemaphore(SemaphorePtr semaphore); |
| |
| // Clients should be careful with this, since it could cause missed |
| // dependencies. Should be safe to call for a repeated operation. |
| void ReplaceWaitSemaphore(SemaphorePtr semaphore); |
| |
| SemaphorePtr TakeWaitSemaphore() { return std::move(wait_semaphore_); } |
| bool HasWaitSemaphore() const { return !!wait_semaphore_; } |
| |
| protected: |
| explicit WaitableResource(ResourceManager* owner); |
| |
| private: |
| SemaphorePtr wait_semaphore_; |
| |
| FXL_DISALLOW_COPY_AND_ASSIGN(WaitableResource); |
| }; |
| |
| // Inline function definitions. |
| |
| inline void WaitableResource::SetWaitSemaphore(SemaphorePtr semaphore) { |
| // This is not necessarily an error, but the consequences will depend on the |
| // specific usage-pattern that first triggers it; we'll deal with this |
| // situation when it first arises. |
| FXL_CHECK(!wait_semaphore_); |
| wait_semaphore_ = std::move(semaphore); |
| } |
| |
| inline void WaitableResource::ReplaceWaitSemaphore(SemaphorePtr semaphore) { |
| wait_semaphore_ = std::move(semaphore); |
| } |
| |
| } // namespace escher |
| |
| #endif // LIB_ESCHER_RESOURCES_WAITABLE_RESOURCE_H_ |