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317 lines
11 KiB
C#
317 lines
11 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Collections.Generic;
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using osu.Framework.Allocation;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Primitives;
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using osu.Framework.Graphics.Rendering;
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using osu.Framework.Graphics.Shaders;
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using osu.Framework.Graphics.Textures;
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using osu.Framework.Utils;
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using osuTK;
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namespace osu.Game.Graphics.Backgrounds
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{
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public partial class TrianglesV2 : Drawable
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{
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private const float triangle_size = 100;
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private const float base_velocity = 50;
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/// <summary>
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/// sqrt(3) / 2
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/// </summary>
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private const float equilateral_triangle_ratio = 0.866f;
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public float Thickness { get; set; } = 0.02f; // No need for invalidation since it's happening in Update()
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public float ScaleAdjust { get; set; } = 1;
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/// <summary>
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/// Whether we should create new triangles as others expire.
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/// </summary>
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protected virtual bool CreateNewTriangles => true;
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/// <summary>
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/// Controls on which <see cref="Axes"/> the portion of triangles that falls within this <see cref="Drawable"/>'s
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/// shape is drawn to the screen. Default is Axes.Both.
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/// </summary>
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public Axes ClampAxes { get; set; } = Axes.Both;
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private readonly BindableFloat spawnRatio = new BindableFloat(1f);
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/// <summary>
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/// The amount of triangles we want compared to the default distribution.
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/// </summary>
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public float SpawnRatio
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{
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get => spawnRatio.Value;
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set => spawnRatio.Value = value;
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}
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/// <summary>
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/// The relative velocity of the triangles. Default is 1.
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/// </summary>
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public float Velocity = 1;
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private readonly List<TriangleParticle> parts = new List<TriangleParticle>();
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private Random? stableRandom;
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private IShader shader = null!;
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private Texture texture = null!;
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/// <summary>
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/// Construct a new triangle visualisation.
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/// </summary>
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/// <param name="seed">An optional seed to stabilise random positions / attributes. Note that this does not guarantee stable playback when seeking in time.</param>
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public TrianglesV2(int? seed = null)
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{
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if (seed != null)
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stableRandom = new Random(seed.Value);
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}
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[BackgroundDependencyLoader]
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private void load(ShaderManager shaders, IRenderer renderer)
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{
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shader = shaders.Load(VertexShaderDescriptor.TEXTURE_2, "TriangleBorder");
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texture = renderer.WhitePixel;
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}
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protected override void LoadComplete()
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{
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base.LoadComplete();
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spawnRatio.BindValueChanged(_ => Reset(), true);
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}
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protected override void Update()
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{
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base.Update();
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Invalidate(Invalidation.DrawNode);
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if (CreateNewTriangles)
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addTriangles(false);
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float elapsedSeconds = (float)Time.Elapsed / 1000;
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// Since position is relative, the velocity needs to scale inversely with DrawHeight.
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float movedDistance = -elapsedSeconds * Velocity * base_velocity / DrawHeight;
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for (int i = 0; i < parts.Count; i++)
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{
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TriangleParticle newParticle = parts[i];
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newParticle.Position.Y += Math.Max(0.5f, parts[i].SpeedMultiplier) * movedDistance;
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parts[i] = newParticle;
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float bottomPos = parts[i].Position.Y + triangle_size * ScaleAdjust * equilateral_triangle_ratio / DrawHeight;
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if (bottomPos < 0)
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parts.RemoveAt(i);
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}
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}
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/// <summary>
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/// Clears and re-initialises triangles according to a given seed.
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/// </summary>
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/// <param name="seed">An optional seed to stabilise random positions / attributes. Note that this does not guarantee stable playback when seeking in time.</param>
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public void Reset(int? seed = null)
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{
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if (seed != null)
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stableRandom = new Random(seed.Value);
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parts.Clear();
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addTriangles(true);
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}
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protected int AimCount { get; private set; }
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private void addTriangles(bool randomY)
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{
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// Limited by the maximum size of QuadVertexBuffer for safety.
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const int max_triangles = ushort.MaxValue / (IRenderer.VERTICES_PER_QUAD + 2);
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AimCount = (int)Math.Clamp(DrawWidth * 0.02f * SpawnRatio, 1, max_triangles);
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int currentCount = parts.Count;
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for (int i = 0; i < AimCount - currentCount; i++)
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parts.Add(createTriangle(randomY));
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}
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private TriangleParticle createTriangle(bool randomY)
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{
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TriangleParticle particle = CreateTriangle();
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float y = 1;
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if (randomY)
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{
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// since triangles are drawn from the top - allow them to be positioned a bit above the screen
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float maxOffset = triangle_size * ScaleAdjust * equilateral_triangle_ratio / DrawHeight;
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y = Interpolation.ValueAt(nextRandom(), -maxOffset, 1f, 0f, 1f);
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}
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particle.Position = new Vector2(nextRandom(), y);
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return particle;
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}
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/// <summary>
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/// Creates a triangle particle with a random speed multiplier.
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/// </summary>
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/// <returns>The triangle particle.</returns>
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protected virtual TriangleParticle CreateTriangle()
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{
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const float std_dev = 0.16f;
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const float mean = 0.5f;
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float u1 = 1 - nextRandom(); //uniform(0,1] random floats
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float u2 = 1 - nextRandom();
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float randStdNormal = (float)(Math.Sqrt(-2.0 * Math.Log(u1)) * Math.Sin(2.0 * Math.PI * u2)); // random normal(0,1)
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float speedMultiplier = Math.Max(mean + std_dev * randStdNormal, 0.1f); // random normal(mean,stdDev^2)
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return new TriangleParticle { SpeedMultiplier = speedMultiplier };
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}
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private float nextRandom() => (float)(stableRandom?.NextDouble() ?? RNG.NextSingle());
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protected override DrawNode CreateDrawNode() => new TrianglesDrawNode(this);
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private class TrianglesDrawNode : DrawNode
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{
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protected new TrianglesV2 Source => (TrianglesV2)base.Source;
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private IShader shader = null!;
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private Texture texture = null!;
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private readonly List<TriangleParticle> parts = new List<TriangleParticle>();
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private Vector2 triangleSize;
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private Vector2 size;
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private float thickness;
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private float texelSize;
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private Axes clampAxes;
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public TrianglesDrawNode(TrianglesV2 source)
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: base(source)
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{
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}
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public override void ApplyState()
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{
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base.ApplyState();
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shader = Source.shader;
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texture = Source.texture;
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size = Source.DrawSize;
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thickness = Source.Thickness;
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clampAxes = Source.ClampAxes;
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triangleSize = new Vector2(1f, equilateral_triangle_ratio) * triangle_size * Source.ScaleAdjust;
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Quad triangleQuad = new Quad(
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Vector2Extensions.Transform(Vector2.Zero, DrawInfo.Matrix),
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Vector2Extensions.Transform(new Vector2(triangle_size, 0f), DrawInfo.Matrix),
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Vector2Extensions.Transform(new Vector2(0f, triangleSize.Y), DrawInfo.Matrix),
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Vector2Extensions.Transform(triangleSize, DrawInfo.Matrix)
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);
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texelSize = 1.5f / triangleQuad.Height;
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parts.Clear();
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parts.AddRange(Source.parts);
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}
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private IUniformBuffer<TriangleBorderData>? borderDataBuffer;
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protected override void Draw(IRenderer renderer)
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{
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base.Draw(renderer);
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if (Source.AimCount == 0 || thickness == 0)
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return;
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borderDataBuffer ??= renderer.CreateUniformBuffer<TriangleBorderData>();
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borderDataBuffer.Data = borderDataBuffer.Data with
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{
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Thickness = thickness,
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TexelSize = texelSize
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};
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shader.Bind();
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shader.BindUniformBlock(@"m_BorderData", borderDataBuffer);
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Vector2 relativeSize = Vector2.Divide(triangleSize, size);
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foreach (TriangleParticle particle in parts)
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{
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Vector2 topLeft = particle.Position - new Vector2(relativeSize.X * 0.5f, 0f);
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Quad triangleQuad = getClampedQuad(clampAxes, topLeft, relativeSize);
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var drawQuad = new Quad(
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Vector2Extensions.Transform(triangleQuad.TopLeft * size, DrawInfo.Matrix),
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Vector2Extensions.Transform(triangleQuad.TopRight * size, DrawInfo.Matrix),
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Vector2Extensions.Transform(triangleQuad.BottomLeft * size, DrawInfo.Matrix),
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Vector2Extensions.Transform(triangleQuad.BottomRight * size, DrawInfo.Matrix)
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);
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RectangleF textureCoords = new RectangleF(
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triangleQuad.TopLeft.X - topLeft.X,
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triangleQuad.TopLeft.Y - topLeft.Y,
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triangleQuad.Width,
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triangleQuad.Height
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) / relativeSize;
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renderer.DrawQuad(texture, drawQuad, DrawColourInfo.Colour.Interpolate(triangleQuad), new RectangleF(0, 0, 1, 1), textureCoords: textureCoords);
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}
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shader.Unbind();
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}
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private static Quad getClampedQuad(Axes clampAxes, Vector2 topLeft, Vector2 size)
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{
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Vector2 clampedTopLeft = topLeft;
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if (clampAxes == Axes.X || clampAxes == Axes.Both)
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{
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clampedTopLeft.X = Math.Clamp(topLeft.X, 0f, 1f);
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size.X = Math.Clamp(topLeft.X + size.X, 0f, 1f) - clampedTopLeft.X;
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}
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if (clampAxes == Axes.Y || clampAxes == Axes.Both)
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{
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clampedTopLeft.Y = Math.Clamp(topLeft.Y, 0f, 1f);
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size.Y = Math.Clamp(topLeft.Y + size.Y, 0f, 1f) - clampedTopLeft.Y;
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}
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return new Quad(clampedTopLeft.X, clampedTopLeft.Y, size.X, size.Y);
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}
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protected override void Dispose(bool isDisposing)
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{
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base.Dispose(isDisposing);
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borderDataBuffer?.Dispose();
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}
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}
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protected struct TriangleParticle
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{
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/// <summary>
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/// The position of the top vertex of the triangle.
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/// </summary>
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public Vector2 Position;
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/// <summary>
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/// The speed multiplier of the triangle.
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/// </summary>
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public float SpeedMultiplier;
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}
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}
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}
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