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
19using namespace ::com::sun::star;
20
21namespace 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: */
void prune()
prune old entries from cache
unsigned int getTexture(const css::geometry::IntegerSize2D &rPixelSize, const sal_Int8 *pPixel, sal_uInt32 nPixelCrc32) const
void flush()
clear whole cache, reset statistic counters
ColCacheType maCache
signed char sal_Int8