Reenable shadows for instanced mesh
Put RSM draw in its own method.
Add support for instanced normal map mesh.
Add Debug for instanced vertex type mismatch.
Exit cmake with error if xrandr library was not found.
Port UI shaders.
Port particle rendering shaders too.
Extract ParticleVBO from gpuparticle.cpp
Bring back the rain
Merge branch 'master' of https://github.com/supertuxkart/stk-code
Factorize some GL code in gpuparticle.
Factorize again code in gpuparticle.
Clean quaternionbuffer at the right place.
Factorise attribute location of simulation program.
Port simple simulation particle shader.
Port heightmap simulation shader.
Factorise simulation code.
Fix malloc/delete mismatch
Dont alloc quaternion buffer if not flip
Add missing bit of code