I'm trying to use QGLWidget::drawTexture to draw a texture with an alpha
channel, but it is not working; the areas that should be transparent are
instead black, as if the alpha channel is missing in the GL texture.
Here's a quick sketch of what I am doing:
MyWidget::initializeGL()
{
d->tex = bindTexture(QImage{":/images/texture"});
glEnable(GL_TEXTURE_2D);
}
MyWidget::paintGL()
{
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
drawTexture(QRectF{128, 128, 128, 128}, d->tex);
}
If I inspect the loaded QImage::format(), it is ARGB, as expected. (I've
also tried with QOpenGLTexture instead of QGLWidget::bindTexture, with
the same results. This does, however, let me confirm that the GL texture
format is GL_RGBA8, again as expected.) Inspecting the image file in an
external editor or Designer, the alpha channel is as expected.
Am I missing something?
--
Matthew
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