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Hi guys,

Running on Windows 7 with NVIDIA GeForce GTX 960, I get the following error message when launching the game:

Error
tile.lua:187: Shader uniform 'borderColour' does not exist.
A common error is to define but not use the variable.
Traceback
[C]: in function 'send'
tile.lua:187: in function 'drawFunc'
camera.lua:51: in function 'drawTo'
tile.lua:182: in function 'drawCanvas'
world.lua:14: in function 'draw'
game.lua:247: in function 'draw'
main.lua:82: in function 'draw'
[C]: in function 'xpcall'

I fixed it with the following change to the glow shader code:

vec4 borderColour_force = borderColour; // This line added
if (closestDist == 0 || closestDist > glowSize) {
    return vec4(0, 0, 0, 0);
} else if (closestDist <= borderSize + 0.5) {
    return borderColour_force; // This line changed
}

I assume that the uniform borderColour was somehow optimized away by my graphics driver, and the error was caused when the CPU code tried to access it. 

I think the problem is borderColour was never referenced outside the if statement. Referencing it outside the if statement by assigning it to the new local variable borderColour_force fixed the issue for me.