e52f1bd7b3
Adds opengl canvas implementation - display-list-based, all rendering done as textured geometry. Needs shader support. Currently compiles and works on Linux, Mac should be ~easy to add, win32 eventually. Change-Id: Ibf3eb88d6a36a91b2960a3a6320d708160e4fc14
125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#define GL_GLEXT_PROTOTYPES
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#include "ogl_texturecache.hxx"
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#include <com/sun/star/geometry/IntegerSize2D.hpp>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glext.h>
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using namespace ::com::sun::star;
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namespace oglcanvas
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{
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TextureCache::TextureCache() :
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maCache(101),
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mnMissCount(0),
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mnHitCount(0)
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{}
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TextureCache::~TextureCache()
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{
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flush();
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}
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void TextureCache::flush()
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{
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// un-bind any texture
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glBindTexture(GL_TEXTURE_2D, 0);
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// delete all cached textures
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TextureCacheMapT::const_iterator aCurr=maCache.begin();
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const TextureCacheMapT::const_iterator aEnd=maCache.end();
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while( aCurr != aEnd )
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{
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glDeleteTextures(1, &aCurr->second.nTexture);
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++aCurr;
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}
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maCache.clear();
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mnMissCount = 0;
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mnHitCount = 0;
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}
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void TextureCache::prune()
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{
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// un-bind any texture
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glBindTexture(GL_TEXTURE_2D, 0);
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// delete already "old" textures, mark "new" entries "old"
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TextureCacheMapT::iterator aNext;
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TextureCacheMapT::iterator aCurr=maCache.begin();
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const TextureCacheMapT::iterator aEnd=maCache.end();
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while( aCurr != aEnd )
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{
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aNext=aCurr; ++aNext;
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if( aCurr->second.bOld )
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{
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glDeleteTextures(1, &aCurr->second.nTexture);
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maCache.erase(aCurr);
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}
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else
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{
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aCurr->second.bOld = true;
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}
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aCurr=aNext;
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}
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mnMissCount = 0;
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mnHitCount = 0;
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}
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unsigned int TextureCache::getTexture( const geometry::IntegerSize2D& rPixelSize,
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const sal_Int8* pPixel,
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sal_uInt32 nPixelCrc32) const
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{
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unsigned int nTexture(0);
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// texture already cached?
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TextureCacheMapT::iterator aCacheEntry;
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if( (aCacheEntry=maCache.find(nPixelCrc32)) == maCache.end() )
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{
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// nope, insert new entry
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glGenTextures(1, &nTexture);
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glBindTexture(GL_TEXTURE_2D, nTexture);
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// TODO(E3): handle limited texture sizes -
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// glGetIntegerv(GL_MAX_TEXTURE_SIZE)
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glTexImage2D(GL_TEXTURE_2D,
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0,
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4,
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rPixelSize.Width,
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rPixelSize.Height,
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0,
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GL_RGBA,
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GL_UNSIGNED_INT_8_8_8_8_REV,
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pPixel);
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maCache[nPixelCrc32].nTexture = nTexture;
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++mnMissCount;
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return nTexture;
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}
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else
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{
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nTexture = aCacheEntry->second.nTexture;
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aCacheEntry->second.bOld = false;
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++mnHitCount;
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}
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return nTexture;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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