Beatmap countdown support is missing

[peppy]

One of the remaining elements which is completely missing from the game.

Let me know if someone wants to take this on and I will provide the relevant stable code.

Discussed in #20583

^{Originally posted by toadsworth-jr October 5, 2022}
Due to a severe lack for appropriate words, I'll let this video speak for itself.

super_strong_am_I_right_in_osu_.getmp3.pro.2.mp4

(Side note, some beatmaps actually included a countdown, such as Disco Prince)

[salmonslay]

I haven't really worked on lazer before but it's something I want to get into, so I'd like to try implementing this. I assume osu.Game\Screens\Play\ would be the appropriate directory to start out in?

edit: it seems like most of the countdown textures & audio clips aren't available in lazer (count(1/2/3).png, go.png & count(1/2/3)s.wav), how do I go about adding them?

[smoogipoo]

You can find the skin resources here: http://m1.ppy.sh/assets/osu!Default%20Skin.zip

You'll only need the 2x versions, which you should PR to https://github.com/ppy/osu-resources

[salmonslay]

@peppy could you send the stable code for this?

[frenzibyte]

        private void InitializeCountdown()
        {
            double firstCircle = hitObjectManager.hitObjects[0].StartTime;

            double offset = AudioEngine.BeatOffsetAt(firstCircle);
            double beatLengthOriginal = AudioEngine.BeatLengthAt(firstCircle);
            if (beatLengthOriginal <= 0) beatLengthOriginal = AudioEngine.BeatLengthAt(0);
            if (beatLengthOriginal <= 0) return;

            double goTime = offset - 5;
            double beatLength = beatLengthOriginal;

            //If the bpm is too fast let's double the length just because it seems sensible.
            if (beatLength <= 333)
                beatLength *= 2;

            //Apply user customisations.
            if (beatmap.Countdown == Countdown.DoubleSpeed)
                beatLength /= 2;
            else if (beatmap.Countdown == Countdown.HalfSpeed)
                beatLength *= 2;

            // Push the countdown back by the mapper's countdown offset before any other adjustments.
            firstCircle -= beatLength * beatmap.CountdownOffset;

            //Skip back until we are at a good place.
            if (goTime >= firstCircle)
                while (goTime > firstCircle - beatLength)
                    goTime -= beatLength;

            int divisor = 1;

            while (goTime < firstCircle - beatLength / divisor)
            {
                goTime += beatLength;
                double beat = ((float)(goTime - offset) / beatLengthOriginal) % 4;
                if (beat > 1.5 &&
                    beat < 3.5)
                    divisor = 2;
                else
                    divisor = 1;
            }

            goTime -= beatLength;

            bool useCountdown = goTime - 4 * beatLength > 0;

            int goTimeInt = (int)goTime;
            int beatLengthInt = (int)beatLength;

            bool targetPractice = ModManager.CheckActive(Player.currentScore.EnabledMods, Mods.Target);

            if (targetPractice || (useCountdown && beatmap.Countdown != Countdown.Disabled && Ruleset.AllowCountdown))
            {
                SkipBoundary = goTimeInt - 6 * beatLengthInt;
                CountdownTime = goTimeInt - 3 * beatLengthInt;

                pSprite ready =
                    new pSprite(TextureManager.Load(@"ready"), Fields.Centre, Origins.Centre,
                        Clocks.Audio, new Vector2(0, 0), 0.91f, false,
                        Color.TransparentWhite);

                if (!targetPractice)
                    AudioEngine.SampleEvents.Add(new SampleCacheItem((int)(goTimeInt - 5.9 * beatLengthInt), AudioEngine.LoadSample(@"readys"), 100, false));

                ready.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - 6 * beatLengthInt, goTimeInt - 5 * beatLengthInt));
                if (!SkinManager.UseNewLayout)
                {
                    ready.Transformations.Add(new Transformation(TransformationType.Scale, 3, 1, goTimeInt - 6 * beatLengthInt, goTimeInt - 5 * beatLengthInt));
                    ready.Transformations.Add(new Transformation(TransformationType.Rotation, -0.4f, 0, goTimeInt - 6 * beatLengthInt, goTimeInt - 5 * beatLengthInt));
                }

                ready.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - 4 * beatLengthInt, goTimeInt - 3 * beatLengthInt));
                ready.Transformations.Add(
                    new Transformation(TransformationType.Scale, 1, SkinManager.UseNewLayout ? 1.2f : 1.8f, goTimeInt - 4 * beatLengthInt,
                        goTimeInt - 3 * beatLengthInt));

                pSprite count1 =
                    new pSprite(TextureManager.Load(@"count1"), Fields.Centre, Origins.Centre,
                        Clocks.Audio, new Vector2(0, 0), 0.88f, false,
                        Color.TransparentWhite);

                pSprite count3 =
                    new pSprite(TextureManager.Load(@"count3"), Fields.Centre, SkinManager.UseNewLayout ? Origins.Centre : Origins.CentreRight,
                        Clocks.Audio, SkinManager.UseNewLayout ? new Vector2(0, 0) : new Vector2(count1.Width / -6.8f, 0), 0.9f, false,
                        Color.TransparentWhite);
                pSprite count2 =
                    new pSprite(TextureManager.Load(@"count2"), Fields.Centre, SkinManager.UseNewLayout ? Origins.Centre : Origins.CentreLeft,
                        Clocks.Audio, SkinManager.UseNewLayout ? new Vector2(0, 0) : new Vector2(count1.Width / 6.8f, 0), 0.89f, false,
                        Color.TransparentWhite);
                pSprite go =
                    new pSprite(TextureManager.Load(@"go"), Fields.Centre, Origins.Centre,
                        Clocks.Audio, new Vector2(0, 0), 0.91f, false,
                        Color.TransparentWhite);

                if (!targetPractice)
                {
                    if (AudioEngine.LoadSample(@"count3s") != -1)
                    {
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 3 * beatLengthInt, AudioEngine.LoadSample(@"count3s"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 2 * beatLengthInt, AudioEngine.LoadSample(@"count2s"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 1 * beatLengthInt, AudioEngine.LoadSample(@"count1s"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt, AudioEngine.LoadSample(@"gos"), 100, false));
                    }
                    else
                    {
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 3 * beatLengthInt, AudioEngine.LoadSample(@"count"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 2 * beatLengthInt, AudioEngine.LoadSample(@"count"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt - 1 * beatLengthInt, AudioEngine.LoadSample(@"count"), 100, false));
                        AudioEngine.SampleEvents.Add(new SampleCacheItem(goTimeInt, AudioEngine.LoadSample(@"count"), 100, false));
                    }
                }

                count3.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - (int)(3.2 * beatLengthInt), goTimeInt - 3 * beatLengthInt));
                count2.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - (int)(2.2 * beatLengthInt), goTimeInt - 2 * beatLengthInt));
                count1.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - (int)(1.2 * beatLengthInt), goTimeInt - 1 * beatLengthInt));

                if (SkinManager.UseNewLayout)
                {
                    count3.Transformations.Add(new Transformation(TransformationType.Scale, 1.4f, 1, goTimeInt - (int)(3.2 * beatLengthInt), goTimeInt - 3 * beatLengthInt));
                    count2.Transformations.Add(new Transformation(TransformationType.Scale, 1.4f, 1, goTimeInt - (int)(2.2 * beatLengthInt), goTimeInt - 2 * beatLengthInt));
                    count1.Transformations.Add(new Transformation(TransformationType.Scale, 1.4f, 1, goTimeInt - (int)(1.2 * beatLengthInt), goTimeInt - 1 * beatLengthInt));

                    count3.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(2.2 * beatLengthInt), goTimeInt - (int)(2.0 * beatLengthInt)));
                    count2.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(1.2 * beatLengthInt), goTimeInt - (int)(1.0 * beatLengthInt)));
                    count1.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(0.2 * beatLengthInt), goTimeInt - (int)(0.0 * beatLengthInt)));
                }
                else
                {
                    count3.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(0.2 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt)));
                    count2.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(0.2 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt)));
                    count1.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt - (int)(0.2 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt)));
                }

                if (SkinManager.UseNewLayout)
                {
                    go.Transformations.Add(new Transformation(TransformationType.Scale, 1.4f, 1, goTimeInt - (int)(0.6 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt)));
                    go.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - (int)(0.2 * beatLengthInt), goTimeInt - 0 * beatLengthInt));
                }
                else
                {
                    go.Transformations.Add(new Transformation(TransformationType.Fade, 0, 1, goTimeInt - (int)(0.6 * beatLengthInt), goTimeInt));

                    Transformation t = new Transformation(TransformationType.Rotation, -4, 0, goTimeInt - (int)(0.6 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt));
                    t.Easing = EasingTypes.Out;
                    go.Transformations.Add(t);

                    t = new Transformation(TransformationType.Scale, 0.2f, 1, goTimeInt - (int)(0.6 * beatLengthInt), goTimeInt + (int)(0.2 * beatLengthInt));
                    t.Easing = EasingTypes.Out;
                    go.Transformations.Add(t);
                }

                go.Transformations.Add(new Transformation(TransformationType.Fade, 1, 0, goTimeInt + (int)(0.3 * beatLengthInt), goTimeInt + beatLengthInt));

                ready.DimImmune = true;
                count3.DimImmune = true;
                count2.DimImmune = true;
                count1.DimImmune = true;
                go.DimImmune = true;


                spriteManagerBelowHitObjectsWidescreen.Add(ready);
                spriteManagerBelowHitObjectsWidescreen.Add(count3);
                spriteManagerBelowHitObjectsWidescreen.Add(count2);
                spriteManagerBelowHitObjectsWidescreen.Add(count1);
                spriteManagerBelowHitObjectsWidescreen.Add(go);
            }
            else if (hitObjectManager.hitObjects[0].StartTime > 6000)
            {
                int loopStartTime = hitObjectManager.hitObjects[0].StartTime - hitObjectManager.PreEmpt - 900;
                int loopCount = ARROW_LOOP_COUNT + Math.Min(2, hitObjectManager.PreEmpt / 200);
                ApplyArrowTransformations(loopCount, loopStartTime);
            }
        }