| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrProgramResource_DEFINED |
| #define GrProgramResource_DEFINED |
| |
| #include "SkRefCnt.h" |
| |
| class GrGpuResource; |
| |
| /** |
| * Class that wraps a resource referenced by a GrProgramElement or GrDrawState. It manages |
| * converting refs to pending io operations. Like SkAutoTUnref, its constructor and setter adopt |
| * a ref from their caller. This class is intended only for internal use in core Gr code. |
| */ |
| class GrProgramResource : SkNoncopyable { |
| public: |
| enum IOType { |
| kRead_IOType, |
| kWrite_IOType, |
| kRW_IOType, |
| |
| kNone_IOType, // For internal use only, don't specify to constructor or setResource(). |
| }; |
| |
| SK_DECLARE_INST_COUNT_ROOT(GrProgramResource); |
| GrProgramResource(); |
| |
| /** Adopts a ref from the caller. ioType expresses what type of IO operations will be marked as |
| pending on the resource when markPendingIO is called. */ |
| explicit GrProgramResource(GrGpuResource*, IOType ioType); |
| |
| ~GrProgramResource(); |
| |
| GrGpuResource* getResource() const { return fResource; } |
| |
| /** Adopts a ref from the caller. ioType expresses what type of IO operations will be marked as |
| pending on the resource when markPendingIO is called. */ |
| void setResource(GrGpuResource*, IOType ioType); |
| |
| /** Does this object own a pending read or write on the resource it is wrapping. */ |
| bool ownsPendingIO() const { return fPendingIO; } |
| |
| /** Shortcut for calling setResource() with NULL. It cannot be called after markingPendingIO |
| is called. */ |
| void reset(); |
| |
| private: |
| /** Called by owning GrProgramElement when the program element is first scheduled for |
| execution. */ |
| void markPendingIO() const; |
| |
| /** Called when the program element/draw state is no longer owned by GrDrawTarget-client code. |
| This lets the cache know that the drawing code will no longer schedule additional reads or |
| writes to the resource using the program element or draw state. */ |
| void removeRef() const; |
| |
| /** Called to indicate that the previous pending IO is complete. Useful when the owning object |
| still has refs, so it is not about to destroy this GrProgramResource, but its previously |
| pending executions have been complete. |
| */ |
| void pendingIOComplete() const; |
| |
| friend class GrRODrawState; |
| friend class GrProgramElement; |
| |
| GrGpuResource* fResource; |
| mutable bool fOwnRef; |
| mutable bool fPendingIO; |
| IOType fIOType; |
| |
| typedef SkNoncopyable INHERITED; |
| }; |
| |
| #endif |