Basic working compressed texture atlas

This adds experimental automatic atlasing of ETC-compressed textures
(to be expanded to additional formats), similar to existing atlas
support of QImages. It is off by default, and can be enabled with
QSG_ENABLE_COMPRESSED_ATLAS=1.

[ChangeLog] Add experimental automatic atlasing of ETC-compressed
textures (can be enabled with QSG_ENABLE_COMPRESSED_ATLAS=1)

Change-Id: Ia66971f51299d082a569bdfaadb662a3e522bd79
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgcontext_p.h b/src/quick/scenegraph/qsgcontext_p.h
index 84a2523f26..da0adcd5d7 100644
--- a/src/quick/scenegraph/qsgcontext_p.h
+++ b/src/quick/scenegraph/qsgcontext_p.h
@@ -78,6 +78,7 @@ class QSGMaterial;
 class QSGRenderLoop;
 class QSGLayer;
 class QQuickTextureFactory;
+class QSGCompressedTextureFactory;
 class QSGContext;
 class QQuickPaintedItem;
 class QSGRendererInterface;
@@ -173,6 +174,7 @@ public:
 
     virtual QSGTexture *createTexture(const QImage &image, uint flags = CreateTexture_Alpha) const = 0;
     virtual QSGRenderer *createRenderer() = 0;
+    virtual QSGTexture *compressedTextureForFactory(const QSGCompressedTextureFactory *) const;
 
     virtual void setAttachToGraphicsContext(bool attach) { Q_UNUSED(attach); }