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osu-lazer/osu.Game/Screens/Menu/LogoVisualisation.cs

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2018-04-13 17:19:50 +08:00
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.ES30;
using osu.Framework.Configuration;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Batches;
using osu.Framework.Graphics.Colour;
using osu.Framework.Graphics.OpenGL.Vertices;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Shaders;
using osu.Framework.Graphics.Textures;
using osu.Game.Beatmaps;
using osu.Game.Graphics;
using System;
using osu.Framework.Allocation;
namespace osu.Game.Screens.Menu
{
public class LogoVisualisation : Drawable, IHasAccentColour
{
private readonly IBindable<WorkingBeatmap> beatmap = new Bindable<WorkingBeatmap>();
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/// <summary>
/// The number of bars to jump each update iteration.
/// </summary>
private const int index_change = 5;
/// <summary>
/// The maximum length of each bar in the visualiser. Will be reduced when kiai is not activated.
/// </summary>
private const float bar_length = 600;
/// <summary>
/// The number of bars in one rotation of the visualiser.
/// </summary>
private const int bars_per_visualiser = 200;
/// <summary>
/// How many times we should stretch around the circumference (overlapping overselves).
/// </summary>
private const float visualiser_rounds = 5;
/// <summary>
/// How much should each bar go down each milisecond (based on a full bar).
/// </summary>
private const float decay_per_milisecond = 0.0024f;
/// <summary>
/// Number of milliseconds between each amplitude update.
/// </summary>
private const float time_between_updates = 50;
/// <summary>
/// The minimum amplitude to show a bar.
/// </summary>
private const float amplitude_dead_zone = 1f / bar_length;
private int indexOffset;
public Color4 AccentColour { get; set; }
private readonly float[] frequencyAmplitudes = new float[256];
private Shader shader;
private readonly Texture texture;
public LogoVisualisation()
{
texture = Texture.WhitePixel;
AccentColour = new Color4(1, 1, 1, 0.2f);
Blending = BlendingMode.Additive;
}
[BackgroundDependencyLoader]
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private void load(ShaderManager shaders, IBindableBeatmap beatmap)
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{
this.beatmap.BindTo(beatmap);
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shader = shaders.Load(VertexShaderDescriptor.TEXTURE_2, FragmentShaderDescriptor.TEXTURE_ROUNDED);
}
private void updateAmplitudes()
{
var track = beatmap.Value.TrackLoaded ? beatmap.Value.Track : null;
var effect = beatmap.Value.BeatmapLoaded ? beatmap.Value.Beatmap.ControlPointInfo.EffectPointAt(track?.CurrentTime ?? Time.Current) : null;
float[] temporalAmplitudes = track?.CurrentAmplitudes.FrequencyAmplitudes ?? new float[256];
for (int i = 0; i < bars_per_visualiser; i++)
{
if (track?.IsRunning ?? false)
{
float targetAmplitude = temporalAmplitudes[(i + indexOffset) % bars_per_visualiser] * (effect?.KiaiMode == true ? 1 : 0.5f);
if (targetAmplitude > frequencyAmplitudes[i])
frequencyAmplitudes[i] = targetAmplitude;
}
else
{
int index = (i + index_change) % bars_per_visualiser;
if (frequencyAmplitudes[index] > frequencyAmplitudes[i])
frequencyAmplitudes[i] = frequencyAmplitudes[index];
}
}
indexOffset = (indexOffset + index_change) % bars_per_visualiser;
Scheduler.AddDelayed(updateAmplitudes, time_between_updates);
}
protected override void LoadComplete()
{
base.LoadComplete();
updateAmplitudes();
}
protected override void Update()
{
base.Update();
float decayFactor = (float)Time.Elapsed * decay_per_milisecond;
for (int i = 0; i < bars_per_visualiser; i++)
{
//3% of extra bar length to make it a little faster when bar is almost at it's minimum
frequencyAmplitudes[i] -= decayFactor * (frequencyAmplitudes[i] + 0.03f);
if (frequencyAmplitudes[i] < 0)
frequencyAmplitudes[i] = 0;
}
Invalidate(Invalidation.DrawNode, shallPropagate: false);
}
protected override DrawNode CreateDrawNode() => new VisualisationDrawNode();
private readonly VisualiserSharedData sharedData = new VisualiserSharedData();
protected override void ApplyDrawNode(DrawNode node)
{
base.ApplyDrawNode(node);
var visNode = (VisualisationDrawNode)node;
visNode.Shader = shader;
visNode.Texture = texture;
visNode.Size = DrawSize.X;
visNode.Shared = sharedData;
visNode.Colour = AccentColour;
visNode.AudioData = frequencyAmplitudes;
}
private class VisualiserSharedData
{
public readonly LinearBatch<TexturedVertex2D> VertexBatch = new LinearBatch<TexturedVertex2D>(100 * 4, 10, PrimitiveType.Quads);
}
private class VisualisationDrawNode : DrawNode
{
public Shader Shader;
public Texture Texture;
public VisualiserSharedData Shared;
//Asuming the logo is a circle, we don't need a second dimension.
public float Size;
public Color4 Colour;
public float[] AudioData;
public override void Draw(Action<TexturedVertex2D> vertexAction)
{
base.Draw(vertexAction);
Shader.Bind();
Texture.TextureGL.Bind();
Vector2 inflation = DrawInfo.MatrixInverse.ExtractScale().Xy;
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ColourInfo colourInfo = DrawColourInfo.Colour;
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colourInfo.ApplyChild(Colour);
if (AudioData != null)
{
for (int j = 0; j < visualiser_rounds; j++)
{
for (int i = 0; i < bars_per_visualiser; i++)
{
if (AudioData[i] < amplitude_dead_zone)
continue;
float rotation = MathHelper.DegreesToRadians(i / (float)bars_per_visualiser * 360 + j * 360 / visualiser_rounds);
float rotationCos = (float)Math.Cos(rotation);
float rotationSin = (float)Math.Sin(rotation);
//taking the cos and sin to the 0..1 range
var barPosition = new Vector2(rotationCos / 2 + 0.5f, rotationSin / 2 + 0.5f) * Size;
var barSize = new Vector2(Size * (float)Math.Sqrt(2 * (1 - Math.Cos(MathHelper.DegreesToRadians(360f / bars_per_visualiser)))) / 2f, bar_length * AudioData[i]);
//The distance between the position and the sides of the bar.
var bottomOffset = new Vector2(-rotationSin * barSize.X / 2, rotationCos * barSize.X / 2);
//The distance between the bottom side of the bar and the top side.
var amplitudeOffset = new Vector2(rotationCos * barSize.Y, rotationSin * barSize.Y);
var rectangle = new Quad(
Vector2Extensions.Transform(barPosition - bottomOffset, DrawInfo.Matrix),
Vector2Extensions.Transform(barPosition - bottomOffset + amplitudeOffset, DrawInfo.Matrix),
Vector2Extensions.Transform(barPosition + bottomOffset, DrawInfo.Matrix),
Vector2Extensions.Transform(barPosition + bottomOffset + amplitudeOffset, DrawInfo.Matrix)
);
Texture.DrawQuad(
rectangle,
colourInfo,
null,
Shared.VertexBatch.AddAction,
//barSize by itself will make it smooth more in the X axis than in the Y axis, this reverts that.
Vector2.Divide(inflation, barSize.Yx));
}
}
}
Shader.Unbind();
}
}
}
}