-- Shader test 06 sin cos -- -- love.graphics.newShader - LOVE -- https://love2d.org/wiki/love.graphics.newShader function love.load() love.graphics.setDefaultFilter("nearest", "nearest") scr_w, scr_h = 640, 480 canvas = love.graphics.newCanvas(scr_w, scr_h) img = love.graphics.newImage("hsvbar.png") -- make shader myshader = love.graphics.newShader("shader.fs") myshader:send("factor", 0.0) angle = 0.0 px = (scr_w - img:getWidth()) / 2 py = (scr_h - img:getHeight()) / 2 end function love.update(dt) angle = (angle + 30 * dt) % 360.0; myshader:send("factor", 1.0 * (1.0 - math.sin(math.rad(angle)))) end function love.draw() love.graphics.setCanvas(canvas) love.graphics.clear(0, 0, 0, 255) love.graphics.setColor(255, 255, 255) love.graphics.setShader(myshader) love.graphics.draw(img, px, py) love.graphics.setShader() love.graphics.setCanvas() -- draw canvas to window wdw_w, wdw_h = love.graphics.getDimensions() scr_scale = math.min((wdw_w / scr_w), (wdw_h / scr_h)) scr_ox = (wdw_w - (scr_w * scr_scale)) / 2 scr_oy = (wdw_h - (scr_h * scr_scale)) / 2 love.graphics.setColor(255, 255, 255) love.graphics.draw(canvas, scr_ox, scr_oy, 0, scr_scale, scr_scale) love.graphics.print("FPS: "..tostring(love.timer.getFPS()), 10, 10) end function love.keypressed(key, isrepeat) if key == "escape" then -- ESC to exit love.event.quit() end end