## [SOLVED] Canvas is crashing 11.2

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DGM
Prole
Posts: 14
Joined: Tue Mar 20, 2018 6:42 am

### [SOLVED] Canvas is crashing 11.2

Hello,

I'm using v11.2 in 64-bit Windows 10. Trying to use a canvas causes an immediate crash, even with the following minimal code:

Code: Select all

function love.load()
canvas_1 = love.graphics.newCanvas()
end

function love.update()

end

function love.draw()
love.graphics.setCanvas(canvas_1)
end
Here's the error message:

Code: Select all

Error

boot.lua:514: present cannot be called while a Canvas is active.

Traceback

[C]: in function 'present'
[C]: in function 'xpcall'
I've tried moving setCanvas to update() and moving the newCanvas command outside load(), but the results are the same. I tinkered with canvases a bit in the previous version and don't remember having this problem, so am I correct in assuming this is a bug in 11.2 or am I doing something wrong?
Last edited by DGM on Tue Jan 22, 2019 1:58 am, edited 1 time in total.

pgimeno
Party member
Posts: 1629
Joined: Sun Oct 18, 2015 2:58 pm

### Re: Canvas is crashing 11.2

When love.draw finishes, you need to have no canvas active, so you need to disable it at some point before the end of love.draw(). This works, for example:

Code: Select all

function love.draw()
love.graphics.setCanvas(canvas_1)
-- do stuff here
love.graphics.setCanvas()
end

Of course, drawing only to a canvas in love.draw and not to the screen isn't very useful, but then your example had the same problem; it's only for illustrative purposes. Here's something a bit more useful:

Code: Select all

function love.draw()
love.graphics.setCanvas(canvas_1)
-- do stuff here
love.graphics.setCanvas()
love.graphics.draw(canvas_1)
end


DGM
Prole
Posts: 14
Joined: Tue Mar 20, 2018 6:42 am

### Re: Canvas is crashing 11.2

pgimeno wrote:
Sun Jan 20, 2019 10:52 pm
When love.draw finishes, you need to have no canvas active, so you need to disable it at some point before the end of love.draw(). This works, for example:
That was the problem. Thanks.

Suggestion to the Love2D devs: a warning about needing to deactivate your canvases in the documentation for the canvas feature might be a good idea.

pgimeno
Party member
Posts: 1629
Joined: Sun Oct 18, 2015 2:58 pm

### Re: Canvas is crashing 11.2

I've added a paragraph to love.graphics.setCanvas, feel free to correct it if you think the wording could be improved (wiki accounts use the same user/password as the forum). To prevent confusion: I'm not a Love2d dev.

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