LÖVE

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local function myStencilFunction()
   love.graphics.rectangle("fill", 225, 200, 350, 300)
end
 
 function love.load()
   
   canvas_main = love.graphics.newCanvas()
   
  
      
 end
 
 
function love.draw()
  love.graphics.setCanvas({canvas_main, stencil=true})
  
    -- draw a rectangle as a stencil. Each pixel 'above' the rectangle will have its 'stencil value' set to 1. The rest will be 0.
    -- Note the 'above' bit. In order for the stencil to take effect, the things effected by it should appear AFTER the stencil shape, 
    -- and INSIDE the 'setStencilTest' sandwich.
    love.graphics.stencil(myStencilFunction, "replace", 1)   
    love.graphics.setColor(255, 255, 255, 255)
    --White background
    love.graphics.rectangle('fill',0,0,love.graphics.getWidth(),love.graphics.getHeight()) -- Things outside the 'StencilTest' sandwich will NOT be effected.
 
   -- Beginning of 'stencilTest' sandwich.
   -- Only allow rendering on pixels which have a 'stencil value' smaller than 1.
    love.graphics.setStencilTest("less", 1)
 
    love.graphics.setColor(255, 0, 0, 255)
    love.graphics.circle("fill", 300, 300, 150, 50)
 
    love.graphics.setColor(0, 255, 0, 255)
    love.graphics.circle("fill", 500, 300, 150, 50)
 
    love.graphics.setColor(0, 0, 255, 255)
    love.graphics.circle("fill", 400, 400, 150, 50)
    
    -- Ending of 'stencilTest' sandwich.
    -- using the "setStencilTest()" function again as seen below, closes and "sandwiches" the entire stencil department. This is how you use it!
    love.graphics.setStencilTest() 
    
    
    love.graphics.setColor(0, 0, 0, 255)
    -- Black line going across the screen
    love.graphics.rectangle('fill',0,love.graphics.getHeight()/2,love.graphics.getWidth(),10) -- Things outside the 'StencilTest' sandwich will NOT be effected.
    
    love.graphics.setCanvas()
    love.graphics.setColor(1,1,1)
    love.graphics.draw(canvas_main)
end