Inexact error when plotting >256 subplots

[IanButterworth]

It seems some aspect of the subplot indexing is held in a UInt8, where it's plausible for more than 256 subplots to be used.

The following errors during the display(scene)

using AbstractPlotting
using AbstractPlotting.MakieLayout
using GLMakie
scene, layout = layoutscene()
for i in 1:257
    layout[1, i] = LAxis(scene)
end
display(scene)

ERROR: LoadError: InexactError: trunc(UInt8, 256)
Stacktrace:
 [1] throw_inexacterror(::Symbol, ::Type{UInt8}, ::Int64) at ./boot.jl:558
 [2] checked_trunc_uint at ./boot.jl:588 [inlined]
 [3] toUInt8 at ./boot.jl:650 [inlined]
 [4] UInt8 at ./boot.jl:710 [inlined]
 [5] convert at ./number.jl:7 [inlined]
 [6] convert at ./essentials.jl:310 [inlined]
 [7] push! at ./array.jl:934 [inlined]
 [8] #27 at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/screen.jl:50 [inlined]
 [9] get!(::GLMakie.var"#27#29"{GLMakie.Screen,Scene}, ::Dict{WeakRef,UInt8}, ::WeakRef) at ./dict.jl:450
 [10] insertplots!(::GLMakie.Screen, ::Scene) at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/screen.jl:48
 [11] (::GLMakie.var"#28#30"{GLMakie.Screen})(::Scene) at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/screen.jl:56
 [12] foreach(::GLMakie.var"#28#30"{GLMakie.Screen}, ::Array{Scene,1}) at ./abstractarray.jl:2009
 [13] insertplots!(::GLMakie.Screen, ::Scene) at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/screen.jl:56
 [14] backend_display(::GLMakie.Screen, ::Scene) at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/screen.jl:124
 [15] backend_display at /Users/ian/.julia/packages/GLMakie/Y3YHT/src/gl_backend.jl:59 [inlined]
 [16] display(::AbstractPlotting.PlotDisplay, ::Scene) at /Users/ian/.julia/packages/AbstractPlotting/tHSnG/src/display.jl:45
 [17] display(::Any) at ./multimedia.jl:328

[ffreyer]

This still errors btw

[SBuercklin]

+1, I have a similar case in CairoMakie that breaks in GLMakie

[Moelf]

let's bump it to UInt16??

[ffreyer]

It's not as easy as just changing a UInt8 to a UInt16. These integers are connected to the stencil buffer and (if I understand correctly) are used to figure out which scene is relevant to which area of the screen. I'm not sure if the element size of the stencil buffer can even be changed. If it can it probably requires stencil and depth buffers to be separate which might also mean the depth buffer needs to be smaller or larger. If it can't it requires reworking the rendering pipeline.