message: Fix how gridDim is computed
diff: #ifndef VSNRAY_DETAIL_TILED_SCHED_H
  #define VSNRAY_DETAIL_TILED_SCHED_H 1
  +#include "../math/detail/math.h"
  #include "basic_sched.h"
  #include "parallel_for.h"
  #include "range.h"
  @@ -48,8 +49,8 @@ struct tiled_sched_backend
  blockDim.x = tr.rows().tile_size();
  blockDim.y = tr.cols().tile_size();
  - gridDim.x = tr.rows().length();
  - gridDim.y = tr.cols().length();
  + gridDim.x = div_up(tr.rows().length(), tr.rows().tile_size());
  + gridDim.y = div_up(tr.cols().length(), tr.cols().tile_size());
  visionaray::parallel_for(
  pool_,
  