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#include "qsgthreadedtexturemanager.h"
#include "qsgtexturemanager_p.h"
#include <QThread>
#include <QMutex>
#include <QWaitCondition>
class QSGThreadedTexture : public QSGTexture
{
Q_OBJECT
public:
QSGThreadedTexture(QSGThreadedTextureManager *m)
: manager(m)
{
}
~QSGThreadedTexture();
QSGThreadedTextureManager *manager;
QImage image;
};
class QSGThreadedTextureManagerThread : public QThread
{
public:
QSGThreadedTextureManagerThread(QSGThreadedTextureManager *m)
: manager(m)
, currentlyUploading(0)
{
manager->createThreadContext();
start();
}
void run() {
manager->makeThreadContextCurrent();
while (true) {
mutex.lock();
currentlyUploading = 0;
condition.wakeOne();
if (requests.isEmpty()) {
condition.wait(&mutex);
}
if (requests.isEmpty()) {
mutex.unlock();
continue;
}
currentlyUploading = requests.takeFirst();
mutex.unlock();
manager->uploadInThread(currentlyUploading->image, currentlyUploading);
}
}
QSGThreadedTextureManager *manager;
QSGThreadedTexture *currentlyUploading;
QWaitCondition condition;
QMutex mutex;
QList<QSGThreadedTexture *> requests;
};
class QSGThreadedTextureManagerPrivate : public QSGTextureManagerPrivate
{
public:
QSGThreadedTextureManagerThread *thread;
QGLWidget *widget;
QGLContext *context;
};
QSGThreadedTexture::~QSGThreadedTexture()
{
QSGThreadedTextureManagerPrivate *d = manager->d_func();
d->thread->mutex.lock();
d->thread->requests.removeOne(this);
while (d->thread->currentlyUploading == this)
d->thread->condition.wait(&d->thread->mutex);
d->thread->mutex.unlock();
d->removeTextureFromCache(this);
}
QSGThreadedTextureManager::QSGThreadedTextureManager()
: QSGTextureManager(*(new QSGThreadedTextureManagerPrivate))
{
Q_D(QSGThreadedTextureManager);
d->thread = 0;
d->widget = 0;
d->context = 0;
}
QSGTextureRef QSGThreadedTextureManager::upload(const QImage &image)
{
Q_D(QSGThreadedTextureManager);
QSGTextureCacheKey key = { image.cacheKey() };
QSGTexture *texture = d->cache.value(key);
if (texture) {
QSGThreadedTexture *ttex = qobject_cast<QSGThreadedTexture *>(texture);
if ((ttex && ttex->status() == QSGTexture::Ready) || !ttex) {
// Already fully uploaded... Just return
return QSGTextureRef(texture);
} else {
// Lock and wait for the texture to uploaded...
d->thread->mutex.lock();
while (ttex->status() == QSGTexture::Loading) {
d->thread->condition.wait(&d->thread->mutex);
}
d->thread->mutex.unlock();
return QSGTextureRef(ttex);
}
}
return d->upload(image, 0, 0);
}
QSGTextureRef QSGThreadedTextureManager::requestUpload(const QImage &image, const QObject *listener, const char *slot)
{
Q_D(QSGThreadedTextureManager);
QSGTextureCacheKey key = { image.cacheKey() };
QSGTexture *texture = d->cache.value(key);
if (texture)
return QSGTextureRef(texture);
QSGThreadedTexture *ttex = new QSGThreadedTexture(this);
ttex->image = image;
if (listener && slot)
connect(ttex, SIGNAL(statusChanged(int)), listener, slot);
ttex->setStatus(QSGTexture::Loading);
d->cache.insert(key, ttex);
if (!d->thread) {
d->thread = new QSGThreadedTextureManagerThread(this);
}
d->thread->mutex.lock();
d->thread->requests << ttex;
d->thread->condition.wakeOne();
d->thread->mutex.unlock();
return QSGTextureRef(ttex);
}
/*!
Called by the rendering thread to create a new context that can be used in the
upload thread.
*/
void QSGThreadedTextureManager::createThreadContext()
{
Q_D(QSGThreadedTextureManager);
QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext());
// Getting the share widget from the current context is rather nasty and
// will not work for lighthouse based
Q_ASSERT(ctx->device() && ctx->device()->devType() == QInternal::Widget);
QGLWidget *share = static_cast<QGLWidget *>(ctx->device());
d->widget = new QGLWidget(0, share);
d->widget->resize(8, 8);
d->context = const_cast<QGLContext *>(d->widget->context());
if (!d->context)
qFatal("QSGThreadedTextureManager: failed to create thread context...");
d->widget->doneCurrent();
ctx->makeCurrent();
}
/*!
Reimplement this function to make the threaded context current.
This function is called from the background thread. The default
implementation makes the context created in createThreadContext
current.
*/
void QSGThreadedTextureManager::makeThreadContextCurrent()
{
Q_D(QSGThreadedTextureManager);
d->context->makeCurrent();
}
/*!
Reimplement this function to upload images in the background thread.
This function is called from the background thread. The default
implementation does this using a single glTexImage2D call.
*/
void QSGThreadedTextureManager::uploadInThread(const QImage &image, QSGTexture *texture)
{
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
QImage copy = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
swizzleBGRAToRGBA(©);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width(), image.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, image.constBits());
bool fail = glGetError() != GL_NO_ERROR;
glBindTexture(GL_TEXTURE_2D, 0);
if (fail) {
texture->setStatus(QSGTexture::Null);
glDeleteTextures(1, &id);
} else {
texture->setTextureId(id);
texture->setTextureSize(image.size());
texture->setAlphaChannel(image.hasAlphaChannel());
texture->setStatus(QSGTexture::Ready);
}
}
#include "qsgthreadedtexturemanager.moc"
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