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41 | |
42 | #ifndef QGLTEXTUREPOOL_P_H |
43 | #define QGLTEXTUREPOOL_P_H |
44 | |
45 | // |
46 | // W A R N I N G |
47 | // ------------- |
48 | // |
49 | // This file is not part of the Qt API. It exists for the convenience |
50 | // of other Qt classes. This header file may change from version to |
51 | // version without notice, or even be removed. |
52 | // |
53 | // We mean it. |
54 | // |
55 | |
56 | #include "qgl.h" |
57 | #include <QtCore/qscopedpointer.h> |
58 | |
59 | QT_BEGIN_NAMESPACE |
60 | |
61 | class QGLTexture; |
62 | class QGLTexturePoolPrivate; |
63 | |
64 | class QGLTexturePool |
65 | { |
66 | public: |
67 | QGLTexturePool(); |
68 | virtual ~QGLTexturePool(); |
69 | |
70 | static QGLTexturePool *instance(); |
71 | |
72 | // Create a new texture with the specified parameters and associate |
73 | // it with "texture". The QGLTexture will be notified when the |
74 | // texture needs to be reclaimed by the pool. |
75 | // |
76 | // This function will call reclaimSpace() when texture creation fails. |
77 | GLuint createTexture(GLenum target, |
78 | GLint level, |
79 | GLint internalformat, |
80 | GLsizei width, |
81 | GLsizei height, |
82 | GLenum format, |
83 | GLenum type, |
84 | QGLTexture *texture); |
85 | |
86 | // Create a permanent texture with the specified parameters. |
87 | // If there is insufficient space for the texture, |
88 | // then this function will call reclaimSpace() and try again. |
89 | // |
90 | // The caller is responsible for calling glDeleteTextures() |
91 | // when it no longer needs the texture, as the texture is not |
92 | // recorded in the texture pool. |
93 | bool createPermanentTexture(GLuint texture, |
94 | GLenum target, |
95 | GLint level, |
96 | GLint internalformat, |
97 | GLsizei width, |
98 | GLsizei height, |
99 | GLenum format, |
100 | GLenum type, |
101 | const GLvoid *data); |
102 | |
103 | // Notify the pool that a QGLTexture object is using |
104 | // an texture again. This allows the pool to move the texture |
105 | // within a least-recently-used list of QGLTexture objects. |
106 | void useTexture(QGLTexture *texture); |
107 | |
108 | // Notify the pool that the texture associated with a |
109 | // QGLTexture is being detached from the pool. The caller |
110 | // will become responsible for calling glDeleteTextures(). |
111 | void detachTexture(QGLTexture *texture); |
112 | |
113 | // Reclaim space for an image allocation with the specified parameters. |
114 | // Returns true if space was reclaimed, or false if there is no |
115 | // further space that can be reclaimed. The "texture" parameter |
116 | // indicates the texture that is trying to obtain space which should |
117 | // not itself be reclaimed. |
118 | bool reclaimSpace(GLint internalformat, |
119 | GLsizei width, |
120 | GLsizei height, |
121 | GLenum format, |
122 | GLenum type, |
123 | QGLTexture *data); |
124 | |
125 | // Hibernate the texture pool because the context is about to be |
126 | // destroyed. All textures left in the pool should be released. |
127 | void hibernate(); |
128 | |
129 | protected: |
130 | // Helper functions for managing the LRU list of QGLTexture objects. |
131 | void moveToHeadOfLRU(QGLTexture *texture); |
132 | void removeFromLRU(QGLTexture *texture); |
133 | QGLTexture *textureLRU(); |
134 | |
135 | private: |
136 | QScopedPointer<QGLTexturePoolPrivate> d_ptr; |
137 | |
138 | Q_DECLARE_PRIVATE(QGLTexturePool) |
139 | Q_DISABLE_COPY(QGLTexturePool) |
140 | }; |
141 | |
142 | QT_END_NAMESPACE |
143 | |
144 | #endif |
145 |
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