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Diffstat (limited to 'src/render/texture/qpaintedtextureimage.cpp')
| -rw-r--r-- | src/render/texture/qpaintedtextureimage.cpp | 17 |
1 files changed, 15 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 { |