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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 "GrGLRenderTarget.h"
14 
15 /**
16  * A ref counted tex id that deletes the texture in its destructor.
17  */
18 class GrGLTexID : public GrRefCnt {
19 public:
SK_DECLARE_INST_COUNT(GrGLTexID)20     SK_DECLARE_INST_COUNT(GrGLTexID)
21 
22     GrGLTexID(const GrGLInterface* gl, GrGLuint texID, bool isWrapped)
23         : fGL(gl)
24         , fTexID(texID)
25         , fIsWrapped(isWrapped) {
26     }
27 
~GrGLTexID()28     virtual ~GrGLTexID() {
29         if (0 != fTexID && !fIsWrapped) {
30             GR_GL_CALL(fGL, DeleteTextures(1, &fTexID));
31         }
32     }
33 
abandon()34     void abandon() { fTexID = 0; }
id()35     GrGLuint id() const { return fTexID; }
36 
37 private:
38     const GrGLInterface* fGL;
39     GrGLuint             fTexID;
40     bool                 fIsWrapped;
41 
42     typedef GrRefCnt INHERITED;
43 };
44 
45 ////////////////////////////////////////////////////////////////////////////////
46 
47 
48 class GrGLTexture : public GrTexture {
49 
50 public:
51     struct TexParams {
52         GrGLenum fFilter;
53         GrGLenum fWrapS;
54         GrGLenum fWrapT;
55         GrGLenum fSwizzleRGBA[4];
invalidateTexParams56         void invalidate() { memset(this, 0xff, sizeof(TexParams)); }
57     };
58 
59     struct Desc : public GrTextureDesc {
60         GrGLuint        fTextureID;
61         bool            fIsWrapped;
62         GrSurfaceOrigin fOrigin;
63     };
64 
65     // creates a texture that is also an RT
66     GrGLTexture(GrGpuGL* gpu,
67                 const Desc& textureDesc,
68                 const GrGLRenderTarget::Desc& rtDesc);
69 
70     // creates a non-RT texture
71     GrGLTexture(GrGpuGL* gpu,
72                 const Desc& textureDesc);
73 
74 
~GrGLTexture()75     virtual ~GrGLTexture() { this->release(); }
76 
77     virtual GrBackendObject getTextureHandle() const SK_OVERRIDE;
78 
invalidateCachedState()79     virtual void invalidateCachedState() SK_OVERRIDE { fTexParams.invalidate(); }
80 
81     // these functions
getCachedTexParams(GrGpu::ResetTimestamp * timestamp)82     const TexParams& getCachedTexParams(GrGpu::ResetTimestamp* timestamp) const {
83         *timestamp = fTexParamsTimestamp;
84         return fTexParams;
85     }
setCachedTexParams(const TexParams & texParams,GrGpu::ResetTimestamp timestamp)86     void setCachedTexParams(const TexParams& texParams,
87                             GrGpu::ResetTimestamp timestamp) {
88         fTexParams = texParams;
89         fTexParamsTimestamp = timestamp;
90     }
textureID()91     GrGLuint textureID() const { return fTexIDObj->id(); }
92 
93 protected:
94 
95     // overrides of GrTexture
96     virtual void onAbandon() SK_OVERRIDE;
97     virtual void onRelease() SK_OVERRIDE;
98 
99 private:
100     TexParams                       fTexParams;
101     GrGpu::ResetTimestamp           fTexParamsTimestamp;
102     GrGLTexID*                      fTexIDObj;
103 
104     void init(GrGpuGL* gpu,
105               const Desc& textureDesc,
106               const GrGLRenderTarget::Desc* rtDesc);
107 
108     typedef GrTexture INHERITED;
109 };
110 
111 #endif
112