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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "ogl_texturecache.hxx"
#include <com/sun/star/geometry/IntegerSize2D.hpp>
#include <GL/glew.h>
using namespace ::com::sun::star;
namespace oglcanvas
{
TextureCache::TextureCache() :
maCache(101),
mnMissCount(0),
mnHitCount(0)
{}
TextureCache::~TextureCache()
{
flush();
}
void TextureCache::flush()
{
// un-bind any texture
glBindTexture(GL_TEXTURE_2D, 0);
// delete all cached textures
TextureCacheMapT::const_iterator aCurr=maCache.begin();
const TextureCacheMapT::const_iterator aEnd=maCache.end();
while( aCurr != aEnd )
{
glDeleteTextures(1, &aCurr->second.nTexture);
++aCurr;
}
maCache.clear();
mnMissCount = 0;
mnHitCount = 0;
}
void TextureCache::prune()
{
// un-bind any texture
glBindTexture(GL_TEXTURE_2D, 0);
// delete already "old" textures, mark "new" entries "old"
TextureCacheMapT::iterator aNext;
TextureCacheMapT::iterator aCurr=maCache.begin();
const TextureCacheMapT::iterator aEnd=maCache.end();
while( aCurr != aEnd )
{
aNext=aCurr; ++aNext;
if( aCurr->second.bOld )
{
glDeleteTextures(1, &aCurr->second.nTexture);
maCache.erase(aCurr);
}
else
{
aCurr->second.bOld = true;
}
aCurr=aNext;
}
mnMissCount = 0;
mnHitCount = 0;
}
unsigned int TextureCache::getTexture( const geometry::IntegerSize2D& rPixelSize,
const sal_Int8* pPixel,
sal_uInt32 nPixelCrc32) const
{
unsigned int nTexture(0);
// texture already cached?
TextureCacheMapT::iterator aCacheEntry;
if( (aCacheEntry=maCache.find(nPixelCrc32)) == maCache.end() )
{
// nope, insert new entry
glGenTextures(1, &nTexture);
glBindTexture(GL_TEXTURE_2D, nTexture);
// TODO(E3): handle limited texture sizes -
// glGetIntegerv(GL_MAX_TEXTURE_SIZE)
glTexImage2D(GL_TEXTURE_2D,
0,
4,
rPixelSize.Width,
rPixelSize.Height,
0,
GL_RGBA,
GL_UNSIGNED_INT_8_8_8_8_REV,
pPixel);
maCache[nPixelCrc32].nTexture = nTexture;
++mnMissCount;
return nTexture;
}
else
{
nTexture = aCacheEntry->second.nTexture;
aCacheEntry->second.bOld = false;
++mnHitCount;
}
return nTexture;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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