Hi,I have some heavy rendering that I would like to speed up using openGL. For the time being using only QPainter regular method but later some native openGL code.
So instead of painting on a QImage, I am painting on a QOpenGLPaintDevice. All is fine except one point: When the painter draws a QImage containing alpha, these alpha pixels appear black. CompositionMode is QPainter::CompositionMode_SourceOver and QImage format for the source is QImage::Format_ARGB32_Premultiplied. Same code painting in a QImage works fine.
I have tried to glEnable(GL_BLEND) and glEnable(GL_DEPTH_TEST) and some others but that didn't fix the issue.
Any idea of what needs to be done ? Many thanks in advance Philippe Lelong
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