Raspberry PI 4 / 64 bits. OpenGL parameter setting inverted ?

[pmx]

Hi all,

when enabling OpenGL in OpenCPN 5.6.1 freshly compiled on a Debian bullseye 64 bits, everything becomes very, very slow, unless I select "Software OpenGL".

IIRC, it was similar on the 32 bits version.

Indeed, I would have expected the opposite (faster with hardware accelerated OpenGL).
I use the default RPI 4 video driver :

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

Any clues ?
Thanks in advance !

Pierre.