grass_flush uploaded u_tiles (vec4[256]) with u_fv(4n floats). On Vulkan an
array element is copied at the size given and placed at the array's stride,
so each tile got one float: nonsense corners and zero blades a cell. The
meadow had no grass on the Vulkan renderer since cdfffa6 while the draw
counts looked right. u_f4v uploads n vec4s; OpenGL was never affected.
PC camp: chunked path matches R3D_GRASS_TILES=1, validation 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Orkuncakilkaya
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