LÖVE

Error
physics.lua:435: Drawing to the stencil buffer with a Canvas active requires either stencil=true or a custom stencil-type Canvas to be used, in setCanvas.

texCanvas = function( canW, canH, image, x, y, a, sx, sy, wd, ht  )
	local canvas = love.graphics.newCanvas( canW, canH )
	local stencilFunction = function()
		gr.polygon( 'fill', polymask )
	end
	gr.setCanvas( canvas )
		gr.stencil( stencilFunction, 'replace', 1 )
		gr.setStencilTest( 'greater',  0 )
			gr.setColor( 1, 1, 1 )
			gr.draw( image, x, y, a, sx, sy, image:getWidth()/2, image:getHeight()/2 )
		gr.setStencilTest()
	gr.setCanvas()
	return canvas
end

Ref wrote: ↑Wed Apr 04, 2018 1:55 pm Glad to hear you got it to work.
Used your suggestion and got the same error message for the line mentioned above.
Must be something else in the code that is causing this Love 10 script to fail in Love 11.
More head scratching required!

local gr = love.graphics
local polymask = {0,0,1,1,0,1}

texCanvas = function( canW, canH, image, x, y, a, sx, sy, wd, ht  )
	local canvas = love.graphics.newCanvas( canW, canH )
	local stencilFunction = function()
		gr.polygon( 'fill', polymask )
	end
	gr.setCanvas( {canvas, stencil=true} )
		gr.stencil( stencilFunction, 'replace', 1 )
		gr.setStencilTest( 'greater',  0 )
			gr.setColor( 1, 1, 1 )
			gr.draw( image, x, y, a, sx, sy, image:getWidth()/2, image:getHeight()/2 )
		gr.setStencilTest()
	gr.setCanvas()
	return canvas
end

texCanvas(100,100,love.graphics.newImage(love.image.newImageData(1,1)), 10, 10, 1, 1, 1, 1, 1)

function love.keypressed(k) if k == "escape" then love.event.quit() end end

Hi.

I made a game that uses a Stencil to create a 'Fog of War' style effect. It worked great.

However, when I tried using the 'Scrale' scaling library to also have a nice fullscreen option, it gave me this error:

(image on reddit thread)

Scrale uses the canvas mechanic to work.

(I understand that this is a problem Love2D version 11.0 and up are having- canvases and stencils colliding.)

(image on reddit thread)

I checked out the implementation of scrale, found that it only uses 'setCanvas' in one place, and changed it from 'love.graphics.setCanvas(scrale.canvas)'

to 'love.graphics.setCanvas({scrale.canvas, stencil=true}' ).

But then, it breaks the Fog of War effect. Things that were previously hidden by it, are now always displayed (Even when they're supposed to be hidden). See below - every sprite in the greyed-out and blacked-out zone is not supposed to appear. It worked just fine before.


(image on reddit thread)


In short- anyone have a clue on how to combine Scrale with using stencils?