LibreOffice Module canvas (master)  1
ogl_texturecache.cxx
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3  * This file is part of the LibreOffice project.
4  *
5  * This Source Code Form is subject to the terms of the Mozilla Public
6  * License, v. 2.0. If a copy of the MPL was not distributed with this
7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8  */
9 
10 #include <sal/config.h>
11 
12 #include <epoxy/gl.h>
13 
14 #include <com/sun/star/geometry/IntegerSize2D.hpp>
15 
16 #include "ogl_texturecache.hxx"
17 
18 
19 using namespace ::com::sun::star;
20 
21 namespace oglcanvas
22 {
24  maCache(101),
25  mnMissCount(0),
26  mnHitCount(0)
27  {}
28 
30  {
31  flush();
32  }
33 
35  {
36  // un-bind any texture
37  glBindTexture(GL_TEXTURE_2D, 0);
38 
39  // delete all cached textures
40  for( const auto& rCache : maCache )
41  {
42  glDeleteTextures( 1, &rCache.second.nTexture );
43  }
44 
45  maCache.clear();
46  mnMissCount = 0;
47  mnHitCount = 0;
48  }
49 
51  {
52  // un-bind any texture
53  glBindTexture(GL_TEXTURE_2D, 0);
54 
55  // delete already "old" textures, mark "new" entries "old"
56  const TextureCacheMapT::const_iterator aEnd = maCache.end();
57  for( auto aCurr = maCache.begin(); aCurr != aEnd; /* increment managed in loop */)
58  {
59  if( aCurr->second.bOld )
60  {
61  glDeleteTextures( 1, &aCurr->second.nTexture );
62  aCurr = maCache.erase( aCurr );
63  }
64  else
65  {
66  aCurr->second.bOld = true;
67  ++aCurr;
68  }
69  }
70 
71  mnMissCount = 0;
72  mnHitCount = 0;
73  }
74 
75  unsigned int TextureCache::getTexture( const geometry::IntegerSize2D& rPixelSize,
76  const sal_Int8* pPixel,
77  sal_uInt32 nPixelCrc32) const
78  {
79  unsigned int nTexture(0);
80 
81  // texture already cached?
82  TextureCacheMapT::iterator aCacheEntry;
83  if( (aCacheEntry=maCache.find(nPixelCrc32)) == maCache.end() )
84  {
85  // nope, insert new entry
86  glGenTextures(1, &nTexture);
87  glBindTexture(GL_TEXTURE_2D, nTexture);
88 
89  // TODO(E3): handle limited texture sizes -
90  // glGetIntegerv(GL_MAX_TEXTURE_SIZE)
91  glTexImage2D(GL_TEXTURE_2D,
92  0,
93  4,
94  rPixelSize.Width,
95  rPixelSize.Height,
96  0,
97  GL_RGBA,
98  GL_UNSIGNED_INT_8_8_8_8_REV,
99  pPixel);
100 
101  maCache[nPixelCrc32].nTexture = nTexture;
102  ++mnMissCount;
103 
104  return nTexture;
105  }
106  else
107  {
108  nTexture = aCacheEntry->second.nTexture;
109  aCacheEntry->second.bOld = false;
110  ++mnHitCount;
111  }
112 
113  return nTexture;
114  }
115 }
116 
117 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
signed char sal_Int8
ColCacheType maCache
unsigned int getTexture(const css::geometry::IntegerSize2D &rPixelSize, const sal_Int8 *pPixel, sal_uInt32 nPixelCrc32) const
void flush()
clear whole cache, reset statistic counters
void prune()
prune old entries from cache