From 39d7613a229600e74604e429fa5c607930f6790c Mon Sep 17 00:00:00 2001
From: Gunnar Sletta <gunnar.sletta@nokia.com>
Date: Wed, 8 Dec 2010 10:57:28 +0100
Subject: More work on async uploads

If textures are deleted while pending upload, remove them
from the queue.

If no timers are running, upload regularily using a timer
---
 src/scenegraph/coreapi/qsgtexturemanager.cpp | 59 +++++++++++++++++++++++++---
 src/scenegraph/coreapi/qsgtexturemanager.h   |  4 ++
 2 files changed, 58 insertions(+), 5 deletions(-)

diff --git a/src/scenegraph/coreapi/qsgtexturemanager.cpp b/src/scenegraph/coreapi/qsgtexturemanager.cpp
index 5e468a0..218c1ea 100644
--- a/src/scenegraph/coreapi/qsgtexturemanager.cpp
+++ b/src/scenegraph/coreapi/qsgtexturemanager.cpp
@@ -103,6 +103,7 @@ public:
         : context(0)
         , maxUploadTime(5)
         , uploadChunkSize(64)
+        , uploadTimer(0)
     {
     }
 
@@ -112,6 +113,9 @@ public:
     QQueue<QSGTextureAsyncUpload> asyncUploads;
     int maxUploadTime;
     int uploadChunkSize;
+
+    int uploadTimer;
+    QTime lastUpload;
 };
 
 
@@ -136,6 +140,17 @@ QSGContext *QSGTextureManager::context() const
 }
 
 
+void QSGTextureManager::textureDestroyed(QObject *destroyed)
+{
+    for (int i=0; i<d->asyncUploads.size(); ++i) {
+        if (destroyed == d->asyncUploads[i].texture) {
+            d->asyncUploads.removeAt(i);
+            break;
+        }
+    }
+}
+
+
 void QSGTextureManager::swizzleBGRAToRGBA(QImage *image)
 {
     const int width = image->width();
@@ -174,6 +189,8 @@ QSGTextureRef QSGTextureManager::upload(const QImage &image)
     texture->setAlphaChannel(image.hasAlphaChannel());
     texture->setStatus(QSGTexture::Ready);
 
+    connect(texture, SIGNAL(destroyed(QObject*)), this, SLOT(textureDestroyed(QObject*)));
+
     d->cache.insert(key, texture);
 
     QSGTextureRef ref(texture);
@@ -195,14 +212,38 @@ QSGTextureRef QSGTextureManager::requestUpload(const QImage &image,
 
     d->asyncUploads << work;
 
+    if (d->uploadTimer == 0) {
+        d->uploadTimer = startTimer(30);
+    }
+
     return QSGTextureRef(t);
 }
 
+
+void QSGTextureManager::timerEvent(QTimerEvent *)
+{
+    // ### gunnar:
+    // In the future, I forsee us starting / stopping this timer based
+    // on wether the vsync animation driver is running or not.
+    // Then we can also skip the "time since last upload" logic which
+    // is currently kinda messy and unpredictable.
+    if (d->lastUpload.elapsed() > 50) {
+        // Its been a while since the last frame tick, so we are pausing...
+        // Upload a "big" chunk...
+        int old = d->maxUploadTime;
+        d->maxUploadTime = 50;
+        processAsyncTextures();
+        d->maxUploadTime = old;
+    }
+}
+
 void QSGTextureManager::processAsyncTextures()
 {
     QTime time;
     time.start();
 
+    d->lastUpload.restart();
+
     while (!d->asyncUploads.isEmpty()) {
 
         QSGTextureAsyncUpload &upload = d->asyncUploads.first();
@@ -215,11 +256,11 @@ void QSGTextureManager::processAsyncTextures()
         int chunkCount = hChunkCount * vChunkCount;
         QSGTexture *t = upload.texture;
 
-//        printf("ASYNC: texture: %p, id=%d, size=(%dx%d), progress: %d / %d\n",
+//        printf("\nASYNC: texture: %p, id=%d, size=(%dx%d), progress: %d / %d (%dx%d)\n",
 //               t,
 //               t->textureId(),
 //               w, h,
-//               upload.progress, chunkCount);
+//               upload.progress, chunkCount, hChunkCount, vChunkCount);
 
         // Create or bind the texture...
         if (upload.texture->textureId() == 0) {
@@ -239,25 +280,33 @@ void QSGTextureManager::processAsyncTextures()
         if (time.elapsed() > d->maxUploadTime)
             return;
 
+        int steps = 0;
+
         while (upload.progress < chunkCount && time.elapsed() < d->maxUploadTime) {
             int x = (upload.progress % hChunkCount) * d->uploadChunkSize;
             int y = (upload.progress / hChunkCount) * d->uploadChunkSize;
 
-            QImage subImage = upload.image.copy(x, y, d->uploadChunkSize, d->uploadChunkSize);
+            QRect area = QRect(x, y, d->uploadChunkSize, d->uploadChunkSize) & upload.image.rect();
+
+            QImage subImage = upload.image.copy(area);
 //            printf("ASYNC: - doing another batch: %d (x=%d, y=%d, w=%d, h=%d\n",
 //                   upload.progress,
 //                   x, y, subImage.width(), subImage.height());
 
             swizzleBGRAToRGBA(&subImage);
-
-            glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, d->uploadChunkSize, d->uploadChunkSize, GL_RGBA, GL_UNSIGNED_BYTE, subImage.constBits());
+            glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, subImage.width(), subImage.height(), GL_RGBA, GL_UNSIGNED_BYTE, subImage.constBits());
 
             ++upload.progress;
         }
 
         if (upload.progress == chunkCount) {
             t->setStatus(QSGTexture::Ready);
+            disconnect(t, SIGNAL(destroyed(QObject*)), this, SLOT(textureDestroyed(QObject*)));
             d->asyncUploads.dequeue();
+            if (d->asyncUploads.size() == 0) {
+                killTimer(d->uploadTimer);
+                d->uploadTimer = 0;
+            }
         }
     }
 
diff --git a/src/scenegraph/coreapi/qsgtexturemanager.h b/src/scenegraph/coreapi/qsgtexturemanager.h
index 46979a2..0bc08aa 100644
--- a/src/scenegraph/coreapi/qsgtexturemanager.h
+++ b/src/scenegraph/coreapi/qsgtexturemanager.h
@@ -175,8 +175,12 @@ public:
 
     static void swizzleBGRAToRGBA(QImage *image);
 
+protected:
+    void timerEvent(QTimerEvent *);
+
 private slots:
     void processAsyncTextures();
+    void textureDestroyed(QObject *texture);
 
 private:
     QSGTextureManagerPrivate *d;
-- 
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