Hi,

I was wondering whether FlightGear's vertex shader for trees was
implemented as ARB_vertex_program (ARBvp1.0) or as a GLSL fragment
shader.

My point is that Intel 945 GM graphics cards do not currently support
GLSL shader programs, but run ARB vertex and fragment shaders just
fine. When I tried running FlightGear 1.9.1 on a Windows laptop having
Intel a 945 GM chipset, I was not seeing any shader trees, despite
setting the checkbox.

I've just modified the osgforest sample (OpenSceneGraph) to run based
on ARB shaders, so I might be able to assist adding that feature to
FlightGear, if so desired. Better supporting integrated chipset
graphics would win a lot of hearts for Flight Gear, I think.

Christian Buchner

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