--@name
--@author
--@shared

if CLIENT then

    render.createRenderTarget("screen_rt") -- Create render target, so the screen won't clear itself on each frame

    hook.add("render", "", function()
        render.selectRenderTarget("screen_rt") -- Draw to the render target

        -- While cpu usage is less than 20%
        while quotaUsed() / quotaMax() < 0.2 do
            coroutine.resume(renderCoroutine) -- Continue drawing
        end

        render.selectRenderTarget()

        render.setRGBA(255, 0, 0, 255)
        render.drawRect(0, 0, 512, 512)

        render.setRGBA(255, 255, 255, 255)
        render.setRenderTargetTexture("screen_rt") -- Bind the rendertarget texture and draw it
        render.drawTexturedRect(0, 0, 1024, 1024) -- RT's texture is 1024x1024 in size
    end)

    function yieldedRender()
        while true do
            for x = 0, 512 - 1 do
                for y = 0, 512 - 1 do
                    render.setColor(Color(math.random()* 255, math.random()* 255, math.random()* 255))
                    render.drawRect(x, y, 1, 1)
                    coroutine.yield() -- Pause the function
                end
            end
        end
    end

    renderCoroutine = coroutine.create(yieldedRender) -- Create a new coroutine
end