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Diffstat (limited to 'src/opengl/qgltexturepool.cpp')
| -rw-r--r-- | src/opengl/qgltexturepool.cpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/src/opengl/qgltexturepool.cpp b/src/opengl/qgltexturepool.cpp new file mode 100644 index 0000000..61a88c3 --- /dev/null +++ b/src/opengl/qgltexturepool.cpp @@ -0,0 +1,241 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtOpenVG module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qgltexturepool_p.h" +#include "qpixmapdata_gl_p.h" + +QT_BEGIN_NAMESPACE + +Q_OPENGL_EXPORT extern QGLWidget* qt_gl_share_widget(); + +static QGLTexturePool *qt_gl_texture_pool = 0; + +class QGLTexturePoolPrivate +{ +public: + QGLTexturePoolPrivate() : lruFirst(0), lruLast(0) {} + + QGLPixmapData *lruFirst; + QGLPixmapData *lruLast; +}; + +QGLTexturePool::QGLTexturePool() + : d_ptr(new QGLTexturePoolPrivate()) +{ +} + +QGLTexturePool::~QGLTexturePool() +{ +} + +QGLTexturePool *QGLTexturePool::instance() +{ + if (!qt_gl_texture_pool) + qt_gl_texture_pool = new QGLTexturePool(); + return qt_gl_texture_pool; +} + +GLuint QGLTexturePool::createTextureForPixmap(GLenum target, + GLint level, + GLint internalformat, + GLsizei width, + GLsizei height, + GLenum format, + GLenum type, + QGLPixmapData *data) +{ + GLuint texture; + glGenTextures(1, &texture); + glBindTexture(target, texture); + do { + glTexImage2D(target, level, internalformat, width, height, 0, format, type, 0); + GLenum error = glGetError(); + if (error == GL_NO_ERROR) { + if (data) + moveToHeadOfLRU(data); + return texture; + } else if (error != GL_OUT_OF_MEMORY) { + qWarning("QGLTexturePool: cannot create temporary texture because of invalid params"); + return 0; + } + } while (reclaimSpace(internalformat, width, height, format, type, data)); + qWarning("QGLTexturePool: cannot reclaim sufficient space for a %dx%d pixmap", + width, height); + return 0; +} + +bool QGLTexturePool::createPermanentTexture(GLuint texture, + GLenum target, + GLint level, + GLint internalformat, + GLsizei width, + GLsizei height, + GLenum format, + GLenum type, + const GLvoid *data) +{ + glBindTexture(target, texture); + do { + glTexImage2D(target, level, internalformat, width, height, 0, format, type, data); + + GLenum error = glGetError(); + if (error == GL_NO_ERROR) { + return true; + } else if (error != GL_OUT_OF_MEMORY) { + qWarning("QGLTexturePool: cannot create permanent texture because of invalid params"); + return false; + } + } while (reclaimSpace(internalformat, width, height, format, type, 0)); + qWarning("QGLTexturePool: cannot reclaim sufficient space for a %dx%d pixmap", + width, height); + return 0; +} + +void QGLTexturePool::releaseTexture(QGLPixmapData *data, GLuint texture) +{ + // Very simple strategy at the moment: just destroy the texture. + if (data) + removeFromLRU(data); + + QGLShareContextScope ctx(qt_gl_share_widget()->context()); + glDeleteTextures(1, &texture); +} + +void QGLTexturePool::useTexture(QGLPixmapData *data) +{ + moveToHeadOfLRU(data); +} + +void QGLTexturePool::detachTexture(QGLPixmapData *data) +{ + removeFromLRU(data); +} + +bool QGLTexturePool::reclaimSpace(GLint internalformat, + GLsizei width, + GLsizei height, + GLenum format, + GLenum type, + QGLPixmapData *data) +{ + Q_UNUSED(internalformat); // For future use in picking the best texture to eject. + Q_UNUSED(width); + Q_UNUSED(height); + Q_UNUSED(format); + Q_UNUSED(type); + + bool succeeded = false; + bool wasInLRU = false; + if (data) { + wasInLRU = data->inLRU; + moveToHeadOfLRU(data); + } + + QGLPixmapData *lrudata = pixmapLRU(); + if (lrudata && lrudata != data) { + lrudata->reclaimTexture(); + succeeded = true; + } + + if (data && !wasInLRU) + removeFromLRU(data); + + return succeeded; +} + +void QGLTexturePool::hibernate() +{ + Q_D(QGLTexturePool); + QGLPixmapData *pd = d->lruLast; + while (pd) { + QGLPixmapData *prevLRU = pd->prevLRU; + pd->inTexturePool = false; + pd->inLRU = false; + pd->nextLRU = 0; + pd->prevLRU = 0; + pd->hibernate(); + pd = prevLRU; + } + d->lruFirst = 0; + d->lruLast = 0; +} + +void QGLTexturePool::moveToHeadOfLRU(QGLPixmapData *data) +{ + Q_D(QGLTexturePool); + if (data->inLRU) { + if (!data->prevLRU) + return; // Already at the head of the list. + removeFromLRU(data); + } + data->inLRU = true; + data->nextLRU = d->lruFirst; + data->prevLRU = 0; + if (d->lruFirst) + d->lruFirst->prevLRU = data; + else + d->lruLast = data; + d->lruFirst = data; +} + +void QGLTexturePool::removeFromLRU(QGLPixmapData *data) +{ + Q_D(QGLTexturePool); + if (!data->inLRU) + return; + if (data->nextLRU) + data->nextLRU->prevLRU = data->prevLRU; + else + d->lruLast = data->prevLRU; + if (data->prevLRU) + data->prevLRU->nextLRU = data->nextLRU; + else + d->lruFirst = data->nextLRU; + data->inLRU = false; +} + +QGLPixmapData *QGLTexturePool::pixmapLRU() +{ + Q_D(QGLTexturePool); + return d->lruLast; +} + +QT_END_NAMESPACE |