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/****************************************************************************
**
** Copyright (C) 2012 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qgltexturepool_p.h"
#include "qpixmapdata_gl_p.h"
#include "qgl_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) {}
QGLTexture *lruFirst;
QGLTexture *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::createTexture(GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLTexture *texture)
{
GLuint tex;
glGenTextures(1, &tex);
glBindTexture(target, tex);
do {
glTexImage2D(target, level, internalformat, width, height, 0, format, type, 0);
GLenum error = glGetError();
if (error == GL_NO_ERROR) {
if (texture)
moveToHeadOfLRU(texture);
return tex;
} 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, texture));
qWarning("QGLTexturePool: cannot reclaim sufficient space for a %dx%d texture",
width, height);
return 0;
}
bool QGLTexturePool::createPermanentTexture(GLuint tex,
GLenum target,
GLint level,
GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
const GLvoid *data)
{
glBindTexture(target, tex);
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 texture",
width, height);
return 0;
}
void QGLTexturePool::useTexture(QGLTexture *texture)
{
moveToHeadOfLRU(texture);
texture->inTexturePool = true;
}
void QGLTexturePool::detachTexture(QGLTexture *texture)
{
removeFromLRU(texture);
texture->inTexturePool = false;
}
bool QGLTexturePool::reclaimSpace(GLint internalformat,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
QGLTexture *texture)
{
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 (texture) {
wasInLRU = texture->inLRU;
moveToHeadOfLRU(texture);
}
QGLTexture *lrutexture = textureLRU();
if (lrutexture && lrutexture != texture) {
if (lrutexture->boundPixmap)
lrutexture->boundPixmap->reclaimTexture();
else
QGLTextureCache::instance()->remove(lrutexture->boundKey);
succeeded = true;
}
if (texture && !wasInLRU)
removeFromLRU(texture);
return succeeded;
}
void QGLTexturePool::hibernate()
{
Q_D(QGLTexturePool);
QGLTexture *texture = d->lruLast;
while (texture) {
QGLTexture *prevLRU = texture->prevLRU;
texture->inTexturePool = false;
texture->inLRU = false;
texture->nextLRU = 0;
texture->prevLRU = 0;
if (texture->boundPixmap)
texture->boundPixmap->hibernate();
else
QGLTextureCache::instance()->remove(texture->boundKey);
texture = prevLRU;
}
d->lruFirst = 0;
d->lruLast = 0;
}
void QGLTexturePool::moveToHeadOfLRU(QGLTexture *texture)
{
Q_D(QGLTexturePool);
if (texture->inLRU) {
if (!texture->prevLRU)
return; // Already at the head of the list.
removeFromLRU(texture);
}
texture->inLRU = true;
texture->nextLRU = d->lruFirst;
texture->prevLRU = 0;
if (d->lruFirst)
d->lruFirst->prevLRU = texture;
else
d->lruLast = texture;
d->lruFirst = texture;
}
void QGLTexturePool::removeFromLRU(QGLTexture *texture)
{
Q_D(QGLTexturePool);
if (!texture->inLRU)
return;
if (texture->nextLRU)
texture->nextLRU->prevLRU = texture->prevLRU;
else
d->lruLast = texture->prevLRU;
if (texture->prevLRU)
texture->prevLRU->nextLRU = texture->nextLRU;
else
d->lruFirst = texture->nextLRU;
texture->inLRU = false;
}
QGLTexture *QGLTexturePool::textureLRU()
{
Q_D(QGLTexturePool);
return d->lruLast;
}
QT_END_NAMESPACE
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