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osu-lazer/osu.Game/Graphics/Cursor/CursorTrail.cs
2017-03-23 13:52:38 +09:00

234 lines
7.5 KiB
C#

// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Shaders;
using osu.Framework.Graphics.Textures;
using osu.Framework.Input;
using OpenTK;
using System;
using osu.Framework.Graphics.OpenGL;
using osu.Framework.Graphics.OpenGL.Buffers;
using OpenTK.Graphics.ES30;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Graphics.Colour;
namespace osu.Game.Graphics.Cursor
{
internal class CursorTrail : Drawable
{
public override bool HandleInput => true;
private int currentIndex;
private Shader shader;
private Texture texture;
private Vector2 size => texture.Size * Scale;
private double timeOffset;
private float time;
private readonly TrailDrawNodeSharedData trailDrawNodeSharedData = new TrailDrawNodeSharedData();
private const int max_sprites = 2048;
private readonly TrailPart[] parts = new TrailPart[max_sprites];
private Vector2? lastPosition;
protected override DrawNode CreateDrawNode() => new TrailDrawNode();
protected override void ApplyDrawNode(DrawNode node)
{
base.ApplyDrawNode(node);
TrailDrawNode tNode = (TrailDrawNode)node;
tNode.Shader = shader;
tNode.Texture = texture;
tNode.Size = size;
tNode.Time = time;
tNode.Shared = trailDrawNodeSharedData;
for (int i = 0; i < parts.Length; ++i)
if (parts[i].InvalidationID > tNode.Parts[i].InvalidationID)
tNode.Parts[i] = parts[i];
}
public CursorTrail()
{
AlwaysReceiveInput = true;
RelativeSizeAxes = Axes.Both;
for (int i = 0; i < max_sprites; i++)
{
parts[i].InvalidationID = 0;
parts[i].WasUpdated = true;
}
}
[BackgroundDependencyLoader]
private void load(ShaderManager shaders, TextureStore textures)
{
shader = shaders?.Load(@"CursorTrail", FragmentShaderDescriptor.Texture);
texture = textures.Get(@"Cursor/cursortrail");
Scale = new Vector2(1 / texture.ScaleAdjust);
}
protected override void LoadComplete()
{
base.LoadComplete();
resetTime();
}
protected override void Update()
{
base.Update();
Invalidate(Invalidation.DrawNode, shallPropagate: false);
const int fade_clock_reset_threshold = 1000000;
time = (float)(Time.Current - timeOffset) / 500f;
if (time > fade_clock_reset_threshold)
resetTime();
}
private void resetTime()
{
for (int i = 0; i < parts.Length; ++i)
{
parts[i].Time -= time;
++parts[i].InvalidationID;
}
time = 0;
timeOffset = Time.Current;
}
protected override bool OnMouseMove(InputState state)
{
if (lastPosition == null)
{
lastPosition = state.Mouse.NativeState.Position;
return base.OnMouseMove(state);
}
Vector2 pos1 = lastPosition.Value;
Vector2 pos2 = state.Mouse.NativeState.Position;
Vector2 diff = pos2 - pos1;
float distance = diff.Length;
Vector2 direction = diff / distance;
float interval = size.X / 2 * 0.9f;
for (float d = interval; d < distance; d += interval)
{
lastPosition = pos1 + direction * d;
addPosition(lastPosition.Value);
}
return base.OnMouseMove(state);
}
private void addPosition(Vector2 pos)
{
parts[currentIndex].Position = pos;
parts[currentIndex].Time = time;
++parts[currentIndex].InvalidationID;
currentIndex = (currentIndex + 1) % max_sprites;
}
private struct TrailPart
{
public Vector2 Position;
public float Time;
public long InvalidationID;
public bool WasUpdated;
}
private class TrailDrawNodeSharedData
{
public VertexBuffer<TexturedVertex2D> VertexBuffer;
}
private class TrailDrawNode : DrawNode
{
public Shader Shader;
public Texture Texture;
public float Time;
public TrailDrawNodeSharedData Shared;
public readonly TrailPart[] Parts = new TrailPart[max_sprites];
public Vector2 Size;
public TrailDrawNode()
{
for (int i = 0; i < max_sprites; i++)
{
Parts[i].InvalidationID = 0;
Parts[i].WasUpdated = false;
}
}
public override void Draw(Action<TexturedVertex2D> vertexAction)
{
if (Shared.VertexBuffer == null)
Shared.VertexBuffer = new QuadVertexBuffer<TexturedVertex2D>(max_sprites, BufferUsageHint.DynamicDraw);
Shader.GetUniform<float>("g_FadeClock").Value = Time;
int updateStart = -1, updateEnd = 0;
for (int i = 0; i < Parts.Length; ++i)
{
if (Parts[i].WasUpdated)
{
if (updateStart == -1)
updateStart = i;
updateEnd = i + 1;
int start = i * 4;
int end = start;
Vector2 pos = Parts[i].Position;
ColourInfo colour = DrawInfo.Colour;
colour.TopLeft.Linear.A = Parts[i].Time + colour.TopLeft.Linear.A;
colour.TopRight.Linear.A = Parts[i].Time + colour.TopRight.Linear.A;
colour.BottomLeft.Linear.A = Parts[i].Time + colour.BottomLeft.Linear.A;
colour.BottomRight.Linear.A = Parts[i].Time + colour.BottomRight.Linear.A;
Texture.DrawQuad(
new Quad(pos.X - Size.X / 2, pos.Y - Size.Y / 2, Size.X, Size.Y),
colour,
null,
v => Shared.VertexBuffer.Vertices[end++] = v);
Parts[i].WasUpdated = false;
}
else if (updateStart != -1)
{
Shared.VertexBuffer.UpdateRange(updateStart * 4, updateEnd * 4);
updateStart = -1;
}
}
// Update all remaining vertices that have been changed.
if (updateStart != -1)
Shared.VertexBuffer.UpdateRange(updateStart * 4, updateEnd * 4);
base.Draw(vertexAction);
Shader.Bind();
Texture.TextureGL.Bind();
Shared.VertexBuffer.Draw();
Shader.Unbind();
}
}
}
}