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#include "threadedtexturemanager.h"
#include <QWaitCondition>
#include <QMutex>
#include <QThread>
#include <QQueue>
#include <QPaintDevice>
#include <QGLWidget>
#include <qdatetime.h>
#ifndef GL_BGRA
#define GL_BGRA 0x80E1
#endif
struct TextureToUpload
{
QImage image;
TextureReference *texture;
TextureManager::UploadHints hints;
};
class QSGTTMUploadThread : public QThread
{
public:
QSGTTMUploadThread(QSGThreadedTextureManager *m)
: manager(m)
{
}
void run() {
manager->makeThreadContextCurrent();
while (true) {
mutex.lock();
if (requests.isEmpty()) {
condition.wait(&mutex);
}
if (requests.isEmpty()) {
mutex.unlock();
continue;
}
TextureToUpload work = requests.dequeue();
mutex.unlock();
if (work.image.isNull())
continue;
manager->uploadInThread(work.texture, work.image, work.hints);
}
}
QSGThreadedTextureManager *manager;
QWaitCondition condition;
QMutex mutex;
QQueue<TextureToUpload> requests;
};
class QSGThreadedTextureManagerPrivate
{
public:
QSGTTMUploadThread *thread;
QGLContext *context;
QGLWidget *widget;
QGLFunctions functions;
};
QSGThreadedTextureManager::QSGThreadedTextureManager()
{
d = new QSGThreadedTextureManagerPrivate;
d->thread = 0;
d->context = 0;
d->widget = 0;
}
const TextureReference *QSGThreadedTextureManager::requestUploadedTexture(const QImage &image, UploadHints hints, QObject *listener, const char *slot)
{
if (!d->thread) {
d->thread = new QSGTTMUploadThread(this);
initializeThreadContext();
d->thread->start();
}
Q_ASSERT(!image.isNull());
if (hints & SynchronousUploadHint) {
return TextureManager::requestUploadedTexture(image, hints, listener, slot);
}
TextureToUpload work;
work.texture = new TextureReference;
work.image = image;
work.hints = hints;
QObject::connect(work.texture, SIGNAL(statusChanged(int)), listener, slot);
d->thread->mutex.lock();
d->thread->requests << work;
d->thread->condition.wakeOne();
d->thread->mutex.unlock();
return work.texture;
}
/*!
Reimplement this function to initialize a non-standard threaded context.
This function is called from the same thread as the scene graph is running
in. The default implementation will construct a QGLWidget, extract its
context and use this context in the background thread.
*/
void QSGThreadedTextureManager::initializeThreadContext()
{
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->functions.initializeGLFunctions(d->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 initializeThreadContext
current.
*/
void QSGThreadedTextureManager::makeThreadContextCurrent()
{
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(TextureReference *texture, const QImage &image, UploadHints hints)
{
#ifdef QT_OPENGL_ES
qWarning("ThreadedTextureManager: Chances are that BGRA does not work on GLES");
#endif
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width(), image.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, image.constBits());
if (hints & TextureManager::GenerateMipmapUploadHint)
d->functions.glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
texture->setOwnsTexture(true);
texture->setTextureId(id);
texture->setTextureSize(image.size());
texture->setMipmaps(hints & TextureManager::GenerateMipmapUploadHint);
texture->setStatus(TextureReference::Uploaded);
}
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