[Android-development] OpenGL on Android - seems colour depth is hardcoded to 8bpp per colour?

[Andrew Haigh]

Hi,
I've a pre-existing C++ library which renders to an externally supplier
OpenGL context, and it wants a buffer format which is RGB565 (no alpha
channel). But trying to configure this via QSurfaceFormat() just doesnt seem
to change from 8bpp for Alpha, Red, Green, and Blue channels. When I looked
into the Android platform abstraction code, I saw this:

 
<https://github.com/qt/qtbase/blob/dev/src/plugins/platforms/android/qandroi
dplatformintegration.cpp>
https://github.com/qt/qtbase/blob/dev/src/plugins/platforms/android/qandroid
platformintegration.cpp
...
QPlatformOpenGLContext
*QAndroidPlatformIntegration::createPlatformOpenGLContext(QOpenGLContext
*context) const
{
QSurfaceFormat format(context->format());
format.setAlphaBufferSize(8);
format.setRedBufferSize(8);
format.setGreenBufferSize(8);
format.setBlueBufferSize(8);
return new QAndroidPlatformOpenGLContext(format, context->shareHandle(),
m_eglDisplay);
}
...

Can anyone explain why this is, and is it possible to change the surface
format as I want? I am sure the underlying device supports it, as this
library is used in other applications without problems...

 

Andrew Haigh

Senior Technical Architect

Cell Software Services Ltd

Email:  <mailto:andrew.haigh at cellsoftware.co.uk>
andrew.haigh at cellsoftware.co.uk

Skype: andrew.haigh_5

Mobile: +44(0)7411378083

 



 

 

 

 



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