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by adam.biltcliffe
Sun Aug 26, 2012 7:28 pm
Forum: Graphics programming
Topic: EGL windows not respecting overscan
Replies: 8
Views: 25264

Re: EGL windows not respecting overscan

Ok, thanks anyway. I can disable overscan on my own TV no problem, I'm just worried about causing unexpected behaviour for users who are happily using the default overscan settings on their own TVs and won't be aware of what causes the issue.
by adam.biltcliffe
Sun Aug 26, 2012 6:56 pm
Forum: Graphics programming
Topic: EGL windows not respecting overscan
Replies: 8
Views: 25264

Re: EGL windows not respecting overscan

dom wrote:You could use the "Get Overscan" property from here:
https://github.com/raspberrypi/firmware ... -interface
Thanks, that looks like exactly what I was looking for.

Do I take it there is no C API for accessing the mailboxes?
by adam.biltcliffe
Sun Aug 26, 2012 6:22 pm
Forum: Graphics programming
Topic: EGL windows not respecting overscan
Replies: 8
Views: 25264

Re: EGL windows not respecting overscan

Is it possible to determine from the framebuffer how much overscan was applied, so that I can apply the same myself? (X respects it, so must have some way of doing this, right?)
by adam.biltcliffe
Sun Aug 26, 2012 6:02 pm
Forum: Graphics programming
Topic: EGL windows not respecting overscan
Replies: 8
Views: 25264

EGL windows not respecting overscan

I am working on a Python library for 2D sprite-based games (pygame's lack of hardware acceleration on the pi being a dealbreaker in this regard and pyglet not currently supporting OpenGL ES). At the moment my surface creation code is based on the examples in /opt/vc/src. However, while experimenting...
by adam.biltcliffe
Sun Aug 26, 2012 5:51 pm
Forum: OpenGLES
Topic: Odd problem with alpha in the frame buffer
Replies: 19
Views: 13374

Re: Odd problem with alpha in the frame buffer

I don't know whether addressing this at the dispmanx level is better, but if you want to just solve this just using GL then instead of calling: glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) use: glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE) This tells GL to blend the...

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