diff options
| -rw-r--r-- | src/render/texture/qpaintedtextureimage.cpp | 17 | ||||
| -rw-r--r-- | tests/manual/paintedtexture-cpp/scene.cpp | 2 |
2 files changed, 17 insertions, 2 deletions
diff --git a/src/render/texture/qpaintedtextureimage.cpp b/src/render/texture/qpaintedtextureimage.cpp index 6e220f340..86df2c562 100644 --- a/src/render/texture/qpaintedtextureimage.cpp +++ b/src/render/texture/qpaintedtextureimage.cpp @@ -199,8 +199,12 @@ void QPaintedTextureImage::setSize(QSize size) } /*! - Schedules the painted texture's paint() function to be called, - which in turn uploads the new image to the GPU. + Immediately triggers the painted texture's paint() function, + which in turn uploads the new image to the GPU. If you are + making multiple changes to a painted texture, consider waiting + until all changes are complete before calling update, in order + to minimize the number of repaints required. + Parameter \a rect is currently unused. */ void QPaintedTextureImage::update(const QRect &rect) @@ -215,6 +219,15 @@ void QPaintedTextureImage::update(const QRect &rect) \fn Qt3DRender::QPaintedTextureImage::paint(QPainter *painter) Paints the texture image with the specified QPainter object \a painter. + + QPainter considers the top-left corner of an image as its origin, while OpenGL considers + the bottom-left corner of a texture as its origin. An easy way to account for this difference + is to set a custom viewport on the painter before doing any other painting: + + \code + painter->setViewport(0, height(), width(), -height()); + ... + \endcode */ QTextureImageDataGeneratorPtr QPaintedTextureImage::dataGenerator() const { diff --git a/tests/manual/paintedtexture-cpp/scene.cpp b/tests/manual/paintedtexture-cpp/scene.cpp index 19bcdbd22..568558358 100644 --- a/tests/manual/paintedtexture-cpp/scene.cpp +++ b/tests/manual/paintedtexture-cpp/scene.cpp @@ -75,6 +75,8 @@ protected: int w = painter->device()->width(); int h = painter->device()->height(); + painter->setViewport(0, h, w, -h); + // clear to white painter->fillRect(0, 0, w, h, QColor(255, 255, 255)); |