1 /*
2  * Copyright 2011 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 
9 #ifndef GrGLTexture_DEFINED
10 #define GrGLTexture_DEFINED
11 
12 #include "GrGpu.h"
13 #include "GrTexture.h"
14 #include "GrGLUtil.h"
15 
16 class GrGLGpu;
17 
18 class GrGLTexture : public GrTexture {
19 
20 public:
21     struct TexParams {
22         GrGLenum fMinFilter;
23         GrGLenum fMagFilter;
24         GrGLenum fWrapS;
25         GrGLenum fWrapT;
26         GrGLenum fSwizzleRGBA[4];
invalidateTexParams27         void invalidate() { memset(this, 0xff, sizeof(TexParams)); }
28     };
29 
30     struct IDDesc {
31         GrGLuint                    fTextureID;
32         GrGpuResource::LifeCycle    fLifeCycle;
33     };
34 
35     GrGLTexture(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&);
36 
37     GrBackendObject getTextureHandle() const override;
38 
textureParamsModified()39     void textureParamsModified() override { fTexParams.invalidate(); }
40 
41     // These functions are used to track the texture parameters associated with the texture.
getCachedTexParams(GrGpu::ResetTimestamp * timestamp)42     const TexParams& getCachedTexParams(GrGpu::ResetTimestamp* timestamp) const {
43         *timestamp = fTexParamsTimestamp;
44         return fTexParams;
45     }
46 
setCachedTexParams(const TexParams & texParams,GrGpu::ResetTimestamp timestamp)47     void setCachedTexParams(const TexParams& texParams,
48                             GrGpu::ResetTimestamp timestamp) {
49         fTexParams = texParams;
50         fTexParamsTimestamp = timestamp;
51     }
52 
textureID()53     GrGLuint textureID() const { return fTextureID; }
54 
55 protected:
56     // The public constructor registers this object with the cache. However, only the most derived
57     // class should register with the cache. This constructor does not do the registration and
58     // rather moves that burden onto the derived class.
59     enum Derived { kDerived };
60     GrGLTexture(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived);
61 
62     void init(const GrSurfaceDesc&, const IDDesc&);
63 
64     void onAbandon() override;
65     void onRelease() override;
66 
67 private:
68     TexParams                       fTexParams;
69     GrGpu::ResetTimestamp           fTexParamsTimestamp;
70     GrGLuint                        fTextureID;
71 
72     // We track this separately from GrGpuResource because this may be both a texture and a render
73     // target, and the texture may be wrapped while the render target is not.
74     bool fIsWrapped;
75 
76     typedef GrTexture INHERITED;
77 };
78 
79 #endif
80