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Hap Video opacity become gray in color
I am developing on OSX El Capitan and OF0.8.4. Trying to play videos with hap alpha codec one over other, I found that the one with opacity on top will become gray in color. The gray color mainly appears on the pixels of opacity within 0 to 255, which is completely ok on 0 or 255 in alpha channel. I can see that the gray part is transparent to show the bottom layer, but what I want is to blend it lighter in color than make it gray. Anyone have idea how to adjust the code so that I can make it? Thanks!
I have solved it. The problem is caused by the rendering order of the OpenGL. I am not sure about the details but adding the following code before the draw() function will make it work.
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE);
If you want to know more about this, you may take a look here: http://stackoverflow.com/questions/17224879/opengl-alpha-blending-issue-blending-ignored-maybe
Thanks for the report. We should probably set the blend function in draw() when the movie has alpha, so I'll reopen this until that is done.