Joonas Rikkonen
aa0fdfb790
Fixed LightComponent light source position not being updated if the item has no body, causing the light source to appear in a wrong position when attaching lights to walls.
664 lines
26 KiB
C#
664 lines
26 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Xml.Linq;
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namespace Barotrauma.Lights
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{
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class LightSource
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{
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private static Texture2D lightTexture;
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private List<ConvexHullList> hullsInRange;
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private Color color;
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private float range;
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public Sprite overrideLightTexture;
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public Texture2D texture;
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//Additional sprite drawn on top of the lightsource. Ignores shadows.
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//Can be used to make lamp sprites glow for example.
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public Sprite LightSprite;
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//Override the alpha value of the light sprite (if not set, the alpha of the light color is used)
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//Can be used to make lamp sprites glow at full brightness even if the light itself is dim.
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public float? OverrideLightSpriteAlpha;
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public SpriteEffects LightSpriteEffect;
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public Submarine ParentSub;
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public bool CastShadows;
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//what was the range of the light when lightvolumes were last calculated
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private float prevCalculatedRange;
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private Vector2 prevCalculatedPosition;
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//do we need to recheck which convex hulls are within range
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//(e.g. position or range of the lightsource has changed)
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public bool NeedsHullCheck = true;
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//do we need to recalculate the vertices of the light volume
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public bool NeedsRecalculation = true;
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//when were the vertices of the light volume last calculated
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private float lastRecalculationTime;
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private Dictionary<Submarine, Vector2> diffToSub;
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private DynamicVertexBuffer lightVolumeBuffer;
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private DynamicIndexBuffer lightVolumeIndexBuffer;
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private int vertexCount;
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private int indexCount;
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private Vector2 position;
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public Vector2 Position
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{
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get { return position; }
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set
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{
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if (position == value) return;
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position = value;
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if (Vector2.DistanceSquared(prevCalculatedPosition, position) < 5.0f * 5.0f) return;
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NeedsHullCheck = true;
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NeedsRecalculation = true;
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prevCalculatedPosition = position;
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}
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}
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private float rotation;
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public float Rotation
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{
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get { return rotation; }
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set
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{
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if (rotation == value) return;
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rotation = value;
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NeedsHullCheck = true;
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NeedsRecalculation = true;
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}
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}
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public Vector2 WorldPosition
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{
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get { return (ParentSub == null) ? position : position + ParentSub.Position; }
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}
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public static Texture2D LightTexture
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{
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get
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{
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if (lightTexture == null)
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{
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lightTexture = TextureLoader.FromFile("Content/Lights/light.png");
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}
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return lightTexture;
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}
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}
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public Color Color
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{
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get { return color; }
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set { color = value; }
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}
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public float Range
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{
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get { return range; }
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set
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{
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range = MathHelper.Clamp(value, 0.0f, 2048.0f);
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if (Math.Abs(prevCalculatedRange - range) < 10.0f) return;
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NeedsHullCheck = true;
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NeedsRecalculation = true;
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prevCalculatedRange = range;
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}
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}
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public bool Enabled = true;
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public LightSource (XElement element)
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: this(Vector2.Zero, 100.0f, Color.White, null)
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{
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range = element.GetAttributeFloat("range", 100.0f);
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color = new Color(element.GetAttributeVector4("color", Vector4.One));
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CastShadows = element.GetAttributeBool("castshadows", true);
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foreach (XElement subElement in element.Elements())
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{
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switch (subElement.Name.ToString().ToLowerInvariant())
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{
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case "sprite":
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LightSprite = new Sprite(subElement);
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float spriteAlpha = subElement.GetAttributeFloat("alpha", -1.0f);
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if (spriteAlpha >= 0.0f)
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{
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OverrideLightSpriteAlpha = spriteAlpha;
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}
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break;
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case "lighttexture":
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overrideLightTexture = new Sprite(subElement);
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break;
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}
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}
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}
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public LightSource(Vector2 position, float range, Color color, Submarine submarine, bool addLight=true)
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{
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hullsInRange = new List<ConvexHullList>();
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this.ParentSub = submarine;
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this.position = position;
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this.range = range;
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this.color = color;
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CastShadows = true;
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texture = LightTexture;
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diffToSub = new Dictionary<Submarine, Vector2>();
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if (addLight) GameMain.LightManager.AddLight(this);
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}
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/// <summary>
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/// Update the contents of ConvexHullList and check if we need to recalculate vertices
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/// </summary>
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private void RefreshConvexHullList(ConvexHullList chList, Vector2 lightPos, Submarine sub)
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{
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var fullChList = ConvexHull.HullLists.Find(x => x.Submarine == sub);
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if (fullChList == null) return;
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chList.List = fullChList.List.FindAll(ch => ch.Enabled && MathUtils.CircleIntersectsRectangle(lightPos, range, ch.BoundingBox));
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NeedsHullCheck = true;
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}
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/// <summary>
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/// Recheck which convex hulls are in range (if needed),
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/// and check if we need to recalculate vertices due to changes in the convex hulls
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/// </summary>
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private void CheckHullsInRange()
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{
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List<Submarine> subs = new List<Submarine>(Submarine.Loaded);
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subs.Add(null);
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foreach (Submarine sub in subs)
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{
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//find the list of convexhulls that belong to the sub
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var chList = hullsInRange.Find(x => x.Submarine == sub);
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//not found -> create one
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if (chList == null)
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{
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chList = new ConvexHullList(sub);
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hullsInRange.Add(chList);
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NeedsRecalculation = true;
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}
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if (chList.List.Any(ch => ch.LastVertexChangeTime > lastRecalculationTime))
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{
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NeedsRecalculation = true;
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}
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Vector2 lightPos = position;
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if (ParentSub == null)
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{
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//light and the convexhulls are both outside
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if (sub == null)
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{
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if (NeedsHullCheck)
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{
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RefreshConvexHullList(chList, lightPos, null);
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}
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}
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//light is outside, convexhulls inside a sub
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else
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{
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lightPos -= sub.Position;
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Rectangle subBorders = sub.Borders;
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subBorders.Location += sub.HiddenSubPosition.ToPoint() - new Point(0, sub.Borders.Height);
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//only draw if the light overlaps with the sub
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if (!MathUtils.CircleIntersectsRectangle(lightPos, range, subBorders))
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{
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if (chList.List.Count > 0) NeedsRecalculation = true;
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chList.List.Clear();
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continue;
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}
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RefreshConvexHullList(chList, lightPos, sub);
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}
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}
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else
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{
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//light is inside, convexhull outside
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if (sub == null) continue;
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//light and convexhull are both inside the same sub
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if (sub == ParentSub)
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{
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if (NeedsHullCheck)
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{
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RefreshConvexHullList(chList, lightPos, sub);
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}
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}
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//light and convexhull are inside different subs
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else
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{
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if (sub.DockedTo.Contains(ParentSub) && !NeedsHullCheck) continue;
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lightPos -= (sub.Position - ParentSub.Position);
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Rectangle subBorders = sub.Borders;
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subBorders.Location += sub.HiddenSubPosition.ToPoint() - new Point(0, sub.Borders.Height);
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//don't draw any shadows if the light doesn't overlap with the borders of the sub
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if (!MathUtils.CircleIntersectsRectangle(lightPos, range, subBorders))
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{
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if (chList.List.Count > 0) NeedsRecalculation = true;
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chList.List.Clear();
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continue;
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}
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//recalculate vertices if the subs have moved > 5 px relative to each other
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Vector2 diff = ParentSub.WorldPosition - sub.WorldPosition;
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Vector2 prevDiff;
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if (!diffToSub.TryGetValue(sub, out prevDiff))
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{
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diffToSub.Add(sub, diff);
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NeedsRecalculation = true;
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}
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else if (Vector2.DistanceSquared(diff, prevDiff) > 5.0f*5.0f)
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{
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diffToSub[sub] = diff;
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NeedsRecalculation = true;
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}
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RefreshConvexHullList(chList, lightPos, sub);
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}
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}
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}
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}
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private List<Vector2> FindRaycastHits()
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{
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if (!CastShadows)
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{
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return null;
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}
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if (range < 1.0f || color.A < 0.01f) return null;
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Vector2 drawPos = position;
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if (ParentSub != null) drawPos += ParentSub.DrawPosition;
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var hulls = new List<ConvexHull>();// ConvexHull.GetHullsInRange(position, range, ParentSub);
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foreach (ConvexHullList chList in hullsInRange)
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{
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hulls.AddRange(chList.List);
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}
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float bounds = range*2;
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//find convexhull segments that are close enough and facing towards the light source
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List<Segment> visibleSegments = new List<Segment>();
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List<SegmentPoint> points = new List<SegmentPoint>();
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foreach (ConvexHull hull in hulls)
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{
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hull.RefreshWorldPositions();
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var visibleHullSegments = hull.GetVisibleSegments(drawPos);
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visibleSegments.AddRange(visibleHullSegments);
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foreach (Segment s in visibleHullSegments)
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{
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points.Add(s.Start);
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points.Add(s.End);
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if (Math.Abs(s.Start.WorldPos.X - drawPos.X) > bounds) bounds = Math.Abs(s.Start.WorldPos.X - drawPos.X);
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if (Math.Abs(s.Start.WorldPos.Y - drawPos.Y) > bounds) bounds = Math.Abs(s.Start.WorldPos.Y - drawPos.Y);
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if (Math.Abs(s.End.WorldPos.X - drawPos.X) > bounds) bounds = Math.Abs(s.End.WorldPos.X - drawPos.X);
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if (Math.Abs(s.End.WorldPos.Y - drawPos.Y) > bounds) bounds = Math.Abs(s.End.WorldPos.Y - drawPos.Y);
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}
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}
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//add a square-shaped boundary to make sure we've got something to construct the triangles from
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//even if there aren't enough hull segments around the light source
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//(might be more effective to calculate if we actually need these extra points)
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var boundaryCorners = new List<SegmentPoint> {
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new SegmentPoint(new Vector2(drawPos.X + bounds, drawPos.Y + bounds)),
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new SegmentPoint(new Vector2(drawPos.X + bounds, drawPos.Y - bounds)),
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new SegmentPoint(new Vector2(drawPos.X - bounds, drawPos.Y - bounds)),
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new SegmentPoint(new Vector2(drawPos.X - bounds, drawPos.Y + bounds))
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};
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//points.Clear();
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points.AddRange(boundaryCorners);
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//visibleSegments.Clear();
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for (int i = 0; i < 4; i++)
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{
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visibleSegments.Add(new Segment(boundaryCorners[i], boundaryCorners[(i + 1) % 4]));
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}
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var compareCCW = new CompareSegmentPointCW(drawPos);
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try
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{
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points.Sort(compareCCW);
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}
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catch (Exception e)
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{
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StringBuilder sb = new StringBuilder("Constructing light volumes failed! Light pos: "+drawPos+", Hull verts:\n");
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foreach (SegmentPoint sp in points)
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{
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sb.AppendLine(sp.Pos.ToString());
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}
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DebugConsole.ThrowError(sb.ToString(), e);
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}
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List<Vector2> output = new List<Vector2>();
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//List<Pair<int, Vector2>> preOutput = new List<Pair<int, Vector2>>();
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//remove points that are very close to each other
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for (int i = 0; i < points.Count - 1; i++)
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{
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if (Math.Abs(points[i].WorldPos.X - points[i + 1].WorldPos.X) < 6 &&
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Math.Abs(points[i].WorldPos.Y - points[i + 1].WorldPos.Y) < 6)
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{
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points.RemoveAt(i + 1);
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i--;
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}
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}
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foreach (SegmentPoint p in points)
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{
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Vector2 dir = Vector2.Normalize(p.WorldPos - drawPos);
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Vector2 dirNormal = new Vector2(-dir.Y, dir.X) * 3;
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//do two slightly offset raycasts to hit the segment itself and whatever's behind it
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Pair<int,Vector2> intersection1 = RayCast(drawPos, drawPos + dir * bounds * 2 - dirNormal, visibleSegments);
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Pair<int,Vector2> intersection2 = RayCast(drawPos, drawPos + dir * bounds * 2 + dirNormal, visibleSegments);
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if (intersection1.First < 0) return new List<Vector2>();
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if (intersection2.First < 0) return new List<Vector2>();
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Segment seg1 = visibleSegments[intersection1.First];
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Segment seg2 = visibleSegments[intersection2.First];
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bool isPoint1 = MathUtils.LineToPointDistance(seg1.Start.WorldPos, seg1.End.WorldPos, p.WorldPos) < 5.0f;
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bool isPoint2 = MathUtils.LineToPointDistance(seg2.Start.WorldPos, seg2.End.WorldPos, p.WorldPos) < 5.0f;
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//hit at the current segmentpoint -> place the segmentpoint into the list
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if (isPoint1 && isPoint2)
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{
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output.Add(p.WorldPos);
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}
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else if (intersection1.First != intersection2.First)
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{
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output.Add(isPoint1 ? p.WorldPos : intersection1.Second);
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output.Add(isPoint2 ? p.WorldPos : intersection2.Second);
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}
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}
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//remove points that are very close to each other
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for (int i = 0; i < output.Count - 1; i++)
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{
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if (Math.Abs(output[i].X - output[i + 1].X) < 6 &&
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Math.Abs(output[i].Y - output[i + 1].Y) < 6)
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{
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output.RemoveAt(i + 1);
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i--;
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}
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}
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return output;
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}
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private Pair<int,Vector2> RayCast(Vector2 rayStart, Vector2 rayEnd, List<Segment> segments)
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{
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float closestDist = 0.0f;
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Vector2? closestIntersection = null;
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int segment = -1;
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for (int i=0;i<segments.Count;i++)
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{
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Segment s = segments[i];
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Vector2? intersection = MathUtils.GetAxisAlignedLineIntersection(rayStart, rayEnd, s.Start.WorldPos, s.End.WorldPos, s.IsHorizontal);
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if (intersection != null)
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{
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float dist = Vector2.DistanceSquared((Vector2)intersection, rayStart);
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if (closestIntersection == null || dist < closestDist)
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{
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closestDist = dist;
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closestIntersection = intersection;
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segment = i;
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}
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}
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}
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Pair<int,Vector2> retVal = new Pair<int,Vector2>();
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retVal.Second = closestIntersection == null ? rayEnd : (Vector2)closestIntersection;
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retVal.First = segment;
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return retVal;
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}
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private void CalculateLightVertices(List<Vector2> rayCastHits)
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{
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List<VertexPositionColorTexture> vertices = new List<VertexPositionColorTexture>();
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Vector2 drawPos = position;
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if (ParentSub != null) drawPos += ParentSub.DrawPosition;
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float cosAngle = (float)Math.Cos(Rotation);
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float sinAngle = -(float)Math.Sin(Rotation);
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Vector2 uvOffset = Vector2.Zero;
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Vector2 overrideTextureDims = Vector2.One;
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if (overrideLightTexture != null)
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{
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overrideTextureDims = new Vector2(overrideLightTexture.SourceRect.Width, overrideLightTexture.SourceRect.Height);
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uvOffset = (overrideLightTexture.Origin / overrideTextureDims) - new Vector2(0.5f, 0.5f);
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}
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// Add a vertex for the center of the mesh
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vertices.Add(new VertexPositionColorTexture(new Vector3(position.X, position.Y, 0),
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Color.White,new Vector2(0.5f, 0.5f) + uvOffset));
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// Add all the other encounter points as vertices
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// storing their world position as UV coordinates
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for (int i = 0; i < rayCastHits.Count; i++)
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{
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Vector2 vertex = rayCastHits[i];
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Vector2 prevVertex = rayCastHits[i > 0 ? i - 1 : rayCastHits.Count - 1];
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Vector2 nextVertex = rayCastHits[i < rayCastHits.Count - 1 ? i + 1 : 0];
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Vector2 rawDiff = vertex - drawPos;
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Vector2 diff = rawDiff;
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diff /= range * 2.0f;
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if (overrideLightTexture != null)
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{
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Vector2 originDiff = diff;
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diff.X = originDiff.X * cosAngle - originDiff.Y * sinAngle;
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diff.Y = originDiff.X * sinAngle + originDiff.Y * cosAngle;
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diff *= (overrideTextureDims / overrideLightTexture.size) * 2.0f;
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diff += uvOffset;
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}
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Vector2 nDiff1 = vertex - nextVertex;
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float tx = nDiff1.X; nDiff1.X = -nDiff1.Y; nDiff1.Y = tx;
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nDiff1 /= Math.Max(Math.Abs(nDiff1.X), Math.Abs(nDiff1.Y));
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Vector2 nDiff2 = prevVertex - vertex;
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tx = nDiff2.X; nDiff2.X = -nDiff2.Y; nDiff2.Y = tx;
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nDiff2 /= Math.Max(Math.Abs(nDiff2.X),Math.Abs(nDiff2.Y));
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Vector2 nDiff = nDiff1 + nDiff2;
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nDiff /= Math.Max(Math.Abs(nDiff.X), Math.Abs(nDiff.Y));
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nDiff *= 50.0f;
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if (Vector2.DistanceSquared(nDiff, rawDiff) > Vector2.DistanceSquared(-nDiff, rawDiff)) nDiff = -nDiff;
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VertexPositionColorTexture fadeVert = new VertexPositionColorTexture(new Vector3(position.X + rawDiff.X + nDiff.X, position.Y + rawDiff.Y + nDiff.Y, 0),
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Color.White * 0.0f, new Vector2(0.5f, 0.5f) + diff);
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vertices.Add(new VertexPositionColorTexture(new Vector3(position.X + rawDiff.X, position.Y + rawDiff.Y, 0),
|
|
Color.White, new Vector2(0.5f, 0.5f) + diff));
|
|
vertices.Add(fadeVert);
|
|
}
|
|
|
|
// Compute the indices to form triangles
|
|
List<short> indices = new List<short>();
|
|
for (int i = 0; i < rayCastHits.Count-1; i++)
|
|
{
|
|
indices.Add(0);
|
|
indices.Add((short)((i*2 + 3) % vertices.Count));
|
|
indices.Add((short)((i*2 + 1) % vertices.Count));
|
|
|
|
indices.Add((short)((i*2 + 1) % vertices.Count));
|
|
indices.Add((short)((i*2 + 3) % vertices.Count));
|
|
indices.Add((short)((i*2 + 4) % vertices.Count));
|
|
|
|
indices.Add((short)((i*2 + 2) % vertices.Count));
|
|
indices.Add((short)((i*2 + 1) % vertices.Count));
|
|
indices.Add((short)((i*2 + 4) % vertices.Count));
|
|
}
|
|
|
|
indices.Add(0);
|
|
indices.Add((short)(1));
|
|
indices.Add((short)(vertices.Count - 2));
|
|
|
|
indices.Add((short)(1));
|
|
indices.Add((short)(vertices.Count-1));
|
|
indices.Add((short)(vertices.Count-2));
|
|
|
|
indices.Add((short)(1));
|
|
indices.Add((short)(2));
|
|
indices.Add((short)(vertices.Count-1));
|
|
|
|
vertexCount = vertices.Count;
|
|
indexCount = indices.Count;
|
|
|
|
//TODO: a better way to determine the size of the vertex buffer and handle changes in size?
|
|
//now we just create a buffer for 64 verts and make it larger if needed
|
|
if (lightVolumeBuffer == null)
|
|
{
|
|
lightVolumeBuffer = new DynamicVertexBuffer(GameMain.Instance.GraphicsDevice, VertexPositionColorTexture.VertexDeclaration, Math.Max(64, (int)(vertexCount*1.5)), BufferUsage.None);
|
|
lightVolumeIndexBuffer = new DynamicIndexBuffer(GameMain.Instance.GraphicsDevice, typeof(short), Math.Max(64*3, (int)(indexCount * 1.5)), BufferUsage.None);
|
|
}
|
|
else if (vertexCount > lightVolumeBuffer.VertexCount || indexCount > lightVolumeIndexBuffer.IndexCount)
|
|
{
|
|
lightVolumeBuffer.Dispose();
|
|
lightVolumeIndexBuffer.Dispose();
|
|
|
|
lightVolumeBuffer = new DynamicVertexBuffer(GameMain.Instance.GraphicsDevice, VertexPositionColorTexture.VertexDeclaration, (int)(vertexCount*1.5), BufferUsage.None);
|
|
lightVolumeIndexBuffer = new DynamicIndexBuffer(GameMain.Instance.GraphicsDevice, typeof(short), (int)(indexCount * 1.5), BufferUsage.None);
|
|
}
|
|
|
|
lightVolumeBuffer.SetData<VertexPositionColorTexture>(vertices.ToArray());
|
|
lightVolumeIndexBuffer.SetData<short>(indices.ToArray());
|
|
}
|
|
|
|
public void Draw(SpriteBatch spriteBatch, BasicEffect lightEffect, Matrix transform)
|
|
{
|
|
if (CastShadows)
|
|
{
|
|
CheckHullsInRange();
|
|
}
|
|
|
|
Vector3 offset = ParentSub == null ? Vector3.Zero :
|
|
new Vector3(ParentSub.DrawPosition.X, ParentSub.DrawPosition.Y, 0.0f);
|
|
|
|
lightEffect.World = Matrix.CreateTranslation(offset) * transform;
|
|
|
|
Vector2 drawPos = position;
|
|
if (ParentSub != null) drawPos += ParentSub.DrawPosition;
|
|
|
|
drawPos.Y = -drawPos.Y;
|
|
|
|
if (LightSprite != null)
|
|
{
|
|
Vector2 origin = LightSprite.Origin;
|
|
if (LightSpriteEffect == SpriteEffects.FlipHorizontally) origin.X = LightSprite.SourceRect.Width - origin.X;
|
|
if (LightSpriteEffect == SpriteEffects.FlipVertically) origin.Y = LightSprite.SourceRect.Height - origin.Y;
|
|
|
|
LightSprite.Draw(
|
|
spriteBatch, drawPos,
|
|
new Color(Color, OverrideLightSpriteAlpha ?? Color.A / 255.0f),
|
|
origin, -Rotation, 1, LightSpriteEffect);
|
|
}
|
|
|
|
//if the light doesn't cast shadows, we can simply render the texture without having to calculate the light volume
|
|
if (!CastShadows)
|
|
{
|
|
Texture2D currentTexture = texture ?? LightTexture;
|
|
if (overrideLightTexture != null) currentTexture = overrideLightTexture.Texture;
|
|
|
|
Vector2 center = new Vector2(currentTexture.Width / 2, currentTexture.Height / 2);
|
|
float scale = range / (currentTexture.Width / 2.0f);
|
|
|
|
spriteBatch.Draw(currentTexture, drawPos, null, color * (color.A / 255.0f), 0, center, scale, SpriteEffects.None, 1);
|
|
return;
|
|
}
|
|
|
|
if (NeedsRecalculation)
|
|
{
|
|
var verts = FindRaycastHits();
|
|
CalculateLightVertices(verts);
|
|
|
|
lastRecalculationTime = (float)Timing.TotalTime;
|
|
NeedsRecalculation = false;
|
|
}
|
|
|
|
if (vertexCount == 0) return;
|
|
|
|
lightEffect.DiffuseColor = (new Vector3(color.R, color.G, color.B) * (color.A / 255.0f)) / 255.0f;
|
|
if (overrideLightTexture != null)
|
|
{
|
|
lightEffect.Texture = overrideLightTexture.Texture;
|
|
}
|
|
else
|
|
{
|
|
lightEffect.Texture = texture ?? LightTexture;
|
|
}
|
|
lightEffect.CurrentTechnique.Passes[0].Apply();
|
|
|
|
GameMain.Instance.GraphicsDevice.SetVertexBuffer(lightVolumeBuffer);
|
|
GameMain.Instance.GraphicsDevice.Indices = lightVolumeIndexBuffer;
|
|
|
|
GameMain.Instance.GraphicsDevice.DrawIndexedPrimitives
|
|
(
|
|
PrimitiveType.TriangleList, 0, 0, indexCount / 3
|
|
);
|
|
}
|
|
|
|
public void Remove()
|
|
{
|
|
if (LightSprite != null) LightSprite.Remove();
|
|
|
|
if (lightVolumeBuffer != null)
|
|
{
|
|
lightVolumeBuffer.Dispose();
|
|
lightVolumeBuffer = null;
|
|
}
|
|
|
|
if (lightVolumeIndexBuffer != null)
|
|
{
|
|
lightVolumeIndexBuffer.Dispose();
|
|
lightVolumeIndexBuffer = null;
|
|
}
|
|
|
|
GameMain.LightManager.RemoveLight(this);
|
|
}
|
|
}
|
|
}
|