make_button_pop = function(params)
	-- button shadow
	App.color{r=0.6, g=0.6, b=0}
--	love.graphics.rectangle('fill', params.x+2, params.y+2, params.w-8, 6)
--	love.graphics.rectangle('fill', params.x+2, params.y+2, 6, params.h-8)
	love.graphics.polygon('fill',
		params.x+2, params.y+2,
		params.x+2, params.y+params.h-4,
		params.x+params.w-4, params.y+2)
	-- button highlight
	App.color{r=1, g=1, b=0}
--	love.graphics.rectangle('fill', params.x+params.w-6, params.y+6, 4, params.h-8)
--	love.graphics.rectangle('fill', params.x+6, params.y+params.h-6, params.w-8, 4)
	love.graphics.polygon('fill',
		params.x+params.w-4, params.y+params.h-4,
		params.x+2, params.y+params.h-4,
		params.x+params.w-4, params.y+2)
	-- button surface
	App.color{r=0.8, g=0.8, b=0}
	love.graphics.rectangle('fill', params.x+6, params.y+6, params.w-12, params.h-12)
end