The GLSL 1.20 variant must stay in plasma/ambient's packs: Qt's OpenGL
RHI selects 120/130/140 on desktop GL <= 3.1 and the renderer tier does
not exclude that hardware, so dropping it (the previous attempt) was a
regression for old GL — caught in review. qsb 6.8 cannot lower those
shaders' uint hash constants for 1.20 while 6.9+ can, and the committed
.qsb were baked with 6.11: the bake toolchain is therefore pinned apart
from the 6.8 runtime floor (vars.QT_VERSION_SHADERTOOLS, default 6.9.3).
The gate also passes -b only to vertex shaders without the no-batch
marker, exactly like build.rs.
cc
vicrodh
a712284306