406 lines
14 KiB
C#
406 lines
14 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.Diagnostics;
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using System.Linq;
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namespace Barotrauma.Lights
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{
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class CachedShadow : IDisposable
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{
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public VertexBuffer ShadowBuffer;
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public Vector2 LightPos;
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public int ShadowVertexCount, PenumbraVertexCount;
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public CachedShadow(VertexPositionColor[] shadowVertices, VertexPositionTexture[] penumbraVertices, Vector2 lightPos, int shadowVertexCount, int penumbraVertexCount)
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{
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//var ShadowVertices = new VertexPositionColor [shadowVertices.Count()];
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//shadowVertices.CopyTo(ShadowVertices, 0);
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ShadowBuffer = new VertexBuffer(GameMain.CurrGraphicsDevice, VertexPositionColor.VertexDeclaration, 6*2, BufferUsage.None);
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ShadowBuffer.SetData(shadowVertices, 0, shadowVertices.Length);
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ShadowVertexCount = shadowVertexCount;
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PenumbraVertexCount = penumbraVertexCount;
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LightPos = lightPos;
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}
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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protected virtual void Dispose(bool disposing)
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{
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ShadowBuffer.Dispose();
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}
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}
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class ConvexHull
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{
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public static List<ConvexHull> list = new List<ConvexHull>();
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static BasicEffect shadowEffect;
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static BasicEffect penumbraEffect;
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private Dictionary<LightSource, CachedShadow> cachedShadows;
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private Vector2[] vertices;
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private int primitiveCount;
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private bool[] backFacing;
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private VertexPositionColor[] shadowVertices;
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private VertexPositionTexture[] penumbraVertices;
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int shadowVertexCount;
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private Entity parentEntity;
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private Rectangle boundingBox;
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public bool Enabled
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{
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get;
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set;
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}
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public Rectangle BoundingBox
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{
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get { return boundingBox; }
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}
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public ConvexHull(Vector2[] points, Color color, Entity parent)
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{
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if (shadowEffect == null)
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{
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shadowEffect = new BasicEffect(GameMain.CurrGraphicsDevice);
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shadowEffect.VertexColorEnabled = true;
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}
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if (penumbraEffect == null)
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{
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penumbraEffect = new BasicEffect(GameMain.CurrGraphicsDevice);
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penumbraEffect.TextureEnabled = true;
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//shadowEffect.VertexColorEnabled = true;
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penumbraEffect.LightingEnabled = false;
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penumbraEffect.Texture = TextureLoader.FromFile("Content/Lights/penumbra.png");
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}
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parentEntity = parent;
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cachedShadows = new Dictionary<LightSource, CachedShadow>();
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shadowVertices = new VertexPositionColor[6 * 2];
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penumbraVertices = new VertexPositionTexture[6];
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vertices = points;
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primitiveCount = vertices.Length;
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CalculateDimensions();
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backFacing = new bool[primitiveCount];
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Enabled = true;
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list.Add(this);
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}
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private void CalculateDimensions()
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{
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Vector2 center = Vector2.Zero;
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float? minX = null, minY = null, maxX = null, maxY = null;
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for (int i = 0; i < vertices.Length; i++)
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{
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center += vertices[i];
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if (minX == null || vertices[i].X < minX) minX = vertices[i].X;
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if (minY == null || vertices[i].Y < minY) minY = vertices[i].Y;
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if (maxX == null || vertices[i].X > maxX) maxX = vertices[i].X;
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if (maxY == null || vertices[i].Y > minY) maxY = vertices[i].Y;
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}
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center /= vertices.Length;
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boundingBox = new Rectangle((int)minX, (int)minY, (int)(maxX - minX), (int)(maxY - minY));
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}
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public void Move(Vector2 amount)
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{
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ClearCachedShadows();
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for (int i = 0; i < vertices.Count(); i++)
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{
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vertices[i] += amount;
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}
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CalculateDimensions();
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}
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public void SetVertices(Vector2[] points)
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{
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ClearCachedShadows();
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vertices = points;
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CalculateDimensions();
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}
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private void RemoveCachedShadow(Lights.LightSource light)
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{
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CachedShadow shadow = null;
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cachedShadows.TryGetValue(light, out shadow);
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if (shadow != null)
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{
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shadow.Dispose();
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cachedShadows.Remove(light);
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}
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}
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private void ClearCachedShadows()
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{
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foreach (KeyValuePair<LightSource, CachedShadow> cachedShadow in cachedShadows)
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{
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cachedShadow.Value.Dispose();
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}
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cachedShadows.Clear();
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}
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public bool Intersects(Rectangle rect)
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{
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Rectangle transformedBounds = boundingBox;
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if (parentEntity != null && parentEntity.Submarine != null)
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{
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transformedBounds.X += (int)parentEntity.Submarine.Position.X;
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transformedBounds.Y += (int)parentEntity.Submarine.Position.Y;
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}
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return transformedBounds.Intersects(rect);
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}
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private void CalculateShadowVertices(Vector2 lightSourcePos, bool los = true)
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{
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shadowVertexCount = 0;
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//compute facing of each edge, using N*L
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for (int i = 0; i < primitiveCount; i++)
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{
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Vector2 firstVertex = new Vector2(vertices[i].X, vertices[i].Y);
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int secondIndex = (i + 1) % primitiveCount;
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Vector2 secondVertex = new Vector2(vertices[secondIndex].X, vertices[secondIndex].Y);
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Vector2 middle = (firstVertex + secondVertex) / 2;
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Vector2 L = lightSourcePos - middle;
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Vector2 N = new Vector2(
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-(secondVertex.Y - firstVertex.Y),
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secondVertex.X - firstVertex.X);
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backFacing[i] = (Vector2.Dot(N, L) < 0);
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}
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//find beginning and ending vertices which
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//belong to the shadow
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int startingIndex = 0;
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int endingIndex = 0;
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for (int i = 0; i < primitiveCount; i++)
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{
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int currentEdge = i;
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int nextEdge = (i + 1) % primitiveCount;
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if (backFacing[currentEdge] && !backFacing[nextEdge])
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endingIndex = nextEdge;
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if (!backFacing[currentEdge] && backFacing[nextEdge])
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startingIndex = nextEdge;
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}
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//nr of vertices that are in the shadow
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if (endingIndex > startingIndex)
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shadowVertexCount = endingIndex - startingIndex + 1;
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else
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shadowVertexCount = primitiveCount + 1 - startingIndex + endingIndex;
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//shadowVertices = new VertexPositionColor[shadowVertexCount * 2];
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//create a triangle strip that has the shape of the shadow
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int currentIndex = startingIndex;
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int svCount = 0;
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while (svCount != shadowVertexCount * 2)
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{
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Vector3 vertexPos = new Vector3(vertices[currentIndex], 0.0f);
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//one vertex on the hull
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shadowVertices[svCount] = new VertexPositionColor();
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shadowVertices[svCount].Color = los ? Color.Black : Color.Transparent;
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shadowVertices[svCount].Position = vertexPos;
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//one extruded by the light direction
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shadowVertices[svCount + 1] = new VertexPositionColor();
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shadowVertices[svCount + 1].Color = los ? Color.Black : Color.Transparent;
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Vector3 L2P = vertexPos - new Vector3(lightSourcePos, 0);
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L2P.Normalize();
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shadowVertices[svCount + 1].Position = new Vector3(lightSourcePos, 0) + L2P * 9000;
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svCount += 2;
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currentIndex = (currentIndex + 1) % primitiveCount;
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}
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if (los)
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{
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CalculatePenumbraVertices(startingIndex, endingIndex, lightSourcePos, los);
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}
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}
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private void CalculatePenumbraVertices(int startingIndex, int endingIndex, Vector2 lightSourcePos, bool los)
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{
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for (int n = 0; n < 4; n += 3)
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{
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Vector3 penumbraStart = new Vector3((n == 0) ? vertices[startingIndex] : vertices[endingIndex], 0.0f);
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penumbraVertices[n] = new VertexPositionTexture();
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penumbraVertices[n].Position = penumbraStart;
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penumbraVertices[n].TextureCoordinate = new Vector2(0.0f, 1.0f);
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//penumbraVertices[0].te = fow ? Color.Black : Color.Transparent;
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for (int i = 0; i < 2; i++)
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{
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penumbraVertices[n + i + 1] = new VertexPositionTexture();
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Vector3 vertexDir = penumbraStart - new Vector3(lightSourcePos, 0);
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vertexDir.Normalize();
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Vector3 normal = (i == 0) ? new Vector3(-vertexDir.Y, vertexDir.X, 0.0f) : new Vector3(vertexDir.Y, -vertexDir.X, 0.0f) * 0.05f;
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if (n > 0) normal = -normal;
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vertexDir = penumbraStart - (new Vector3(lightSourcePos, 0) - normal * 20.0f);
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vertexDir.Normalize();
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penumbraVertices[n + i + 1].Position = new Vector3(lightSourcePos, 0) + vertexDir * 9000;
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if (los)
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{
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penumbraVertices[n + i + 1].TextureCoordinate = (i == 0) ? new Vector2(0.05f, 0.0f) : new Vector2(1.0f, 0.0f);
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}
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else
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{
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penumbraVertices[n + i + 1].TextureCoordinate = (i == 0) ? new Vector2(1.0f, 0.0f) : Vector2.Zero;
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}
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}
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if (n > 0)
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{
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var temp = penumbraVertices[4];
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penumbraVertices[4] = penumbraVertices[5];
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penumbraVertices[5] = temp;
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}
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}
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}
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public void DrawShadows(GraphicsDevice graphicsDevice, Camera cam, LightSource light, Matrix transform, bool los = true)
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{
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if (!Enabled) return;
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CachedShadow cachedShadow = null;
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if (cachedShadows.TryGetValue(light, out cachedShadow) &&
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(light.Position == cachedShadow.LightPos || Vector2.DistanceSquared(light.Position, cachedShadow.LightPos) < 1.0f))
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{
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}
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else
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{
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//if (light.Submarine!=null && parentEntity != null && parentEntity.Submarine == light.Submarine)
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//{
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// lightPos = light.Position;
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//}
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CalculateShadowVertices(light.Position, los);
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if (cachedShadow != null)
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{
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cachedShadow.LightPos = light.Position;
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cachedShadow.ShadowBuffer.SetData(shadowVertices, 0, shadowVertices.Length);
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cachedShadow.ShadowVertexCount = shadowVertexCount;
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}
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else
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{
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cachedShadow = new CachedShadow(shadowVertices, penumbraVertices, light.Position, shadowVertexCount, 0);
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RemoveCachedShadow(light);
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cachedShadows.Add(light, cachedShadow);
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}
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}
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graphicsDevice.SetVertexBuffer(cachedShadow.ShadowBuffer);
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shadowVertexCount = cachedShadow.ShadowVertexCount;
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DrawShadows(graphicsDevice, cam, transform, los);
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}
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public void DrawShadows(GraphicsDevice graphicsDevice, Camera cam, Vector2 lightSourcePos, Matrix transform, bool los = true)
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{
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if (!Enabled) return;
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if (parentEntity != null && parentEntity.Submarine != null) lightSourcePos -= parentEntity.Submarine.Position;
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CalculateShadowVertices(lightSourcePos, los);
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DrawShadows(graphicsDevice, cam, transform, los);
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}
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private void DrawShadows(GraphicsDevice graphicsDevice, Camera cam, Matrix transform, bool los = true)
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{
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Vector3 offset = Vector3.Zero;
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if (parentEntity != null && parentEntity.Submarine != null)
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{
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offset = new Vector3(parentEntity.Submarine.DrawPosition.X, parentEntity.Submarine.DrawPosition.Y, 0.0f);
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}
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if (shadowVertexCount>0)
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{
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shadowEffect.World = Matrix.CreateTranslation(offset) * transform;
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if (los)
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{
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shadowEffect.CurrentTechnique.Passes[0].Apply();
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graphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleStrip, shadowVertices, 0, shadowVertexCount * 2 - 2);
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}
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else
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{
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shadowEffect.CurrentTechnique.Passes[0].Apply();
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graphicsDevice.DrawPrimitives(PrimitiveType.TriangleStrip, 0, shadowVertexCount * 2 - 2);
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}
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}
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if (los)
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{
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penumbraEffect.World = shadowEffect.World;
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penumbraEffect.CurrentTechnique.Passes[0].Apply();
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#if WINDOWS
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graphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, penumbraVertices, 0, 2, VertexPositionTexture.VertexDeclaration);
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#endif
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}
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}
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public void Remove()
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{
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ClearCachedShadows();
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list.Remove(this);
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}
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}
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}
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