LÖVE

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local shader = [[
extern number w, h;
extern Image mosaic_image;

vec4 effect(vec4 colour, Image img, vec2 imgpos, vec2 scrpos)
{
    vec4 pix = Texel(img, imgpos) * colour;
    vec4 mosaic = Texel(mosaic_image, imgpos*vec2(w,h)) * colour;
    // Apply soft light (lerp between multiply and screen, modulated by bottom)
    pix.rgb = mix(pix.rgb * mosaic.rgb,                            // multiply
       (vec3(1.) - (vec3(1.) - mosaic.rgb) * (vec3(1.) - pix.rgb)),  // screen
       pix.rgb  // bottom layer modulates
    );
    pix.a = min(pix.a, mosaic.a);
    return pix;
}
]]

local img


function love.load(arg)
  img = love.graphics.newImage(arg[1])
  img:setFilter("linear", "nearest")

  local mosaic = love.graphics.newImage('mosaic-base.png')
  mosaic:setWrap("repeat")
  mosaic:setFilter("linear", "nearest")

  shader = love.graphics.newShader(shader)
  shader:send('mosaic_image', mosaic)
end

function love.draw()
  love.graphics.setShader(shader)
  shader:send("w", img:getWidth())
  shader:send("h", img:getHeight())
  love.graphics.draw(img, 0, 0, 0, 3)
  love.graphics.setShader()
end

function love.keypressed(k) return k == "escape" and love.event.quit() end