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/****************************************************************************
**
** 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
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