390 lines
14 KiB
C#
390 lines
14 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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using Microsoft.Xna.Framework.Content;
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using System.Collections.Generic;
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using System.Linq;
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namespace Barotrauma.Lights
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{
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class LightManager
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{
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private const float AmbientLightUpdateInterval = 0.2f;
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private const float AmbientLightFalloff = 0.8f;
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private static Entity viewTarget;
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public static Entity ViewTarget
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{
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get { return viewTarget; }
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set {
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if (viewTarget == value) return;
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viewTarget = value;
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}
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}
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public Color AmbientLight;
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private float lightmapScale = 0.5f;
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public RenderTarget2D lightMap
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{
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get;
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private set;
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}
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public RenderTarget2D losTexture
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{
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get;
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private set;
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}
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BasicEffect lightEffect;
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public Effect losEffect
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{
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get; private set;
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}
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private static Texture2D alphaClearTexture;
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private List<LightSource> lights;
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public bool LosEnabled = true;
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public bool LightingEnabled = true;
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public bool ObstructVision;
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LightSource losSource;
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private Sprite visionCircle;
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private Dictionary<Hull, Color> hullAmbientLights;
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private Dictionary<Hull, Color> smoothedHullAmbientLights;
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private float ambientLightUpdateTimer;
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public LightManager(GraphicsDevice graphics, ContentManager content)
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{
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lights = new List<LightSource>();
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AmbientLight = new Color(20, 20, 20, 255);
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//visionCircle = Sprite.LoadTexture("Content/Lights/visioncircle.png");
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visionCircle = new Sprite("Content/Lights/visioncircle.png", new Vector2(0.2f, 0.5f));
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var pp = graphics.PresentationParameters;
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lightMap = new RenderTarget2D(graphics,
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(int)(GameMain.GraphicsWidth*lightmapScale), (int)(GameMain.GraphicsHeight*lightmapScale), false,
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pp.BackBufferFormat, pp.DepthStencilFormat, pp.MultiSampleCount,
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RenderTargetUsage.DiscardContents);
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losTexture = new RenderTarget2D(graphics, (int)(GameMain.GraphicsWidth*lightmapScale), (int)(GameMain.GraphicsHeight*lightmapScale), false, SurfaceFormat.Color, DepthFormat.None);
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losSource = new LightSource(Vector2.Zero, GameMain.GraphicsWidth, Color.White, null, false);
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losSource.texture = new Texture2D(graphics, 1, 1);
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losSource.texture.SetData(new Color[] { Color.White });// fill the texture with white
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#if WINDOWS
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losEffect = content.Load<Effect>("losshader");
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#else
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losEffect = content.Load<Effect>("losshader_opengl");
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#endif
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if (lightEffect == null)
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{
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lightEffect = new BasicEffect(GameMain.Instance.GraphicsDevice);
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lightEffect.VertexColorEnabled = true;
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lightEffect.TextureEnabled = true;
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lightEffect.Texture = LightSource.LightTexture;
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}
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hullAmbientLights = new Dictionary<Hull, Color>();
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smoothedHullAmbientLights = new Dictionary<Hull, Color>();
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if (alphaClearTexture == null)
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{
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alphaClearTexture = TextureLoader.FromFile("Content/Lights/alphaOne.png");
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}
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}
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public void AddLight(LightSource light)
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{
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lights.Add(light);
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}
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public void RemoveLight(LightSource light)
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{
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lights.Remove(light);
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}
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public void OnMapLoaded()
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{
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foreach (LightSource light in lights)
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{
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light.NeedsHullCheck = true;
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light.NeedsRecalculation = true;
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}
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}
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public void Update(float deltaTime)
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{
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if (ambientLightUpdateTimer > 0.0f)
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{
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ambientLightUpdateTimer -= deltaTime;
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}
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else
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{
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CalculateAmbientLights();
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ambientLightUpdateTimer = AmbientLightUpdateInterval;
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}
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foreach (Hull hull in hullAmbientLights.Keys)
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{
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if (!smoothedHullAmbientLights.ContainsKey(hull))
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{
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smoothedHullAmbientLights.Add(hull, Color.TransparentBlack);
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}
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}
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foreach (Hull hull in smoothedHullAmbientLights.Keys.ToList())
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{
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Color targetColor = Color.TransparentBlack;
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hullAmbientLights.TryGetValue(hull, out targetColor);
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smoothedHullAmbientLights[hull] = Color.Lerp(smoothedHullAmbientLights[hull], targetColor, deltaTime);
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}
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}
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public void UpdateLightMap(GraphicsDevice graphics, SpriteBatch spriteBatch, Camera cam, Effect blur)
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{
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if (!LightingEnabled) return;
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graphics.SetRenderTarget(lightMap);
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Rectangle viewRect = cam.WorldView;
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viewRect.Y -= cam.WorldView.Height;
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//clear to some small ambient light
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graphics.Clear(AmbientLight);
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graphics.BlendState = BlendState.Additive;
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spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Additive, null, null, null, null, cam.Transform * Matrix.CreateScale(new Vector3(lightmapScale, lightmapScale, 1.0f)));
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Matrix transform = cam.ShaderTransform
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* Matrix.CreateOrthographic(GameMain.GraphicsWidth, GameMain.GraphicsHeight, -1, 1) * 0.5f;
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Vector3 offset = Vector3.Zero;// new Vector3(Submarine.MainSub.DrawPosition.X, Submarine.MainSub.DrawPosition.Y, 0.0f);
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foreach (LightSource light in lights)
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{
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if (light.Color.A < 1 || light.Range < 1.0f || !light.CastShadows || !light.Enabled) continue;
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if (!MathUtils.CircleIntersectsRectangle(light.WorldPosition, light.Range, viewRect)) continue;
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light.Draw(spriteBatch, lightEffect, transform);
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}
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lightEffect.World = Matrix.CreateTranslation(offset) * transform;
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GameMain.ParticleManager.Draw(spriteBatch, false, null, Particles.ParticleBlendState.Additive);
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if (Character.Controlled != null)
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{
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if (Character.Controlled.FocusedItem != null)
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{
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Character.Controlled.FocusedItem.IsHighlighted = true;
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Character.Controlled.FocusedItem.Draw(spriteBatch, false, true);
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Character.Controlled.FocusedItem.IsHighlighted = true;
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}
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else if (Character.Controlled.FocusedCharacter != null)
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{
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Character.Controlled.FocusedCharacter.Draw(spriteBatch);
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}
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}
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foreach (Hull hull in smoothedHullAmbientLights.Keys)
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{
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if (smoothedHullAmbientLights[hull].A < 0.01f) continue;
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var drawRect =
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hull.Submarine == null ?
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hull.Rect :
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new Rectangle((int)(hull.Submarine.DrawPosition.X + hull.Rect.X), (int)(hull.Submarine.DrawPosition.Y + hull.Rect.Y), hull.Rect.Width, hull.Rect.Height);
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GUI.DrawRectangle(spriteBatch,
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new Vector2(drawRect.X, -drawRect.Y),
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new Vector2(hull.Rect.Width, hull.Rect.Height),
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smoothedHullAmbientLights[hull] * 0.5f, true);
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}
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spriteBatch.End();
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//clear alpha, to avoid messing stuff up later
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//ClearAlphaToOne(graphics, spriteBatch);
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graphics.SetRenderTarget(null);
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graphics.BlendState = BlendState.AlphaBlend;
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}
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public void UpdateObstructVision(GraphicsDevice graphics, SpriteBatch spriteBatch, Camera cam, Vector2 lookAtPosition)
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{
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if (!LosEnabled || ViewTarget == null) return;
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graphics.SetRenderTarget(losTexture);
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//--------------------------------------
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graphics.Clear(Color.Black);
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if (ObstructVision)
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{
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Vector2 diff = lookAtPosition - ViewTarget.WorldPosition;
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float rotation = MathUtils.VectorToAngle(diff);
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Vector2 scale = new Vector2(MathHelper.Clamp(diff.Length() / 256.0f, 2.0f, 5.0f), 2.0f) * 0.3f;
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visionCircle.size = new Vector2(visionCircle.SourceRect.Width * scale.X, visionCircle.SourceRect.Height * scale.Y);
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losSource.overrideLightTexture = visionCircle;
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losSource.Rotation = rotation;
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}
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else
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{
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losSource.overrideLightTexture = null;
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}
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graphics.BlendState = BlendState.Additive;
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Vector2 pos = ViewTarget.Position;
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losSource.Position = pos;
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losSource.NeedsRecalculation = true;
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losSource.ParentSub = ViewTarget.Submarine;
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Matrix transform = cam.ShaderTransform
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* Matrix.CreateOrthographic(GameMain.GraphicsWidth, GameMain.GraphicsHeight, -1, 1) * 0.5f;
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losSource.Draw(spriteBatch, lightEffect, transform);
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graphics.BlendState = BlendState.AlphaBlend;
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graphics.SetRenderTarget(null);
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}
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private void CalculateAmbientLights()
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{
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hullAmbientLights.Clear();
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foreach (LightSource light in lights)
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{
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if (light.Color.A < 1f || light.Range < 1.0f) continue;
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var newAmbientLights = AmbientLightHulls(light);
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foreach (Hull hull in newAmbientLights.Keys)
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{
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if (hullAmbientLights.ContainsKey(hull))
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{
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//hull already lit by some other light source -> add the ambient lights up
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hullAmbientLights[hull] = new Color(
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hullAmbientLights[hull].R + newAmbientLights[hull].R,
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hullAmbientLights[hull].G + newAmbientLights[hull].G,
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hullAmbientLights[hull].B + newAmbientLights[hull].B,
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hullAmbientLights[hull].A + newAmbientLights[hull].A);
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}
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else
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{
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hullAmbientLights.Add(hull, newAmbientLights[hull]);
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}
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}
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}
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}
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/// <summary>
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/// Add ambient light to the hull the lightsource is inside + all adjacent hulls connected by a gap
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/// </summary>
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private Dictionary<Hull, Color> AmbientLightHulls(LightSource light)
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{
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Dictionary<Hull, Color> hullAmbientLight = new Dictionary<Hull, Color>();
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var hull = Hull.FindHull(light.WorldPosition);
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if (hull == null) return hullAmbientLight;
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return AmbientLightHulls(hull, hullAmbientLight, light.Color * (light.Range/2000.0f));
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}
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/// <summary>
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/// A flood fill algorithm that adds ambient light to all hulls the starting hull is connected to
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/// </summary>
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private Dictionary<Hull, Color> AmbientLightHulls(Hull hull, Dictionary<Hull, Color> hullAmbientLight, Color currColor)
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{
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if (hullAmbientLight.ContainsKey(hull))
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{
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if (hullAmbientLight[hull].A > currColor.A)
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return hullAmbientLight;
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else
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hullAmbientLight[hull] = currColor;
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}
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else
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{
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hullAmbientLight.Add(hull, currColor);
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}
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Color nextHullLight = currColor * AmbientLightFalloff;
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//light getting too dark to notice -> no need to spread further
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if (nextHullLight.A < 20) return hullAmbientLight;
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//use hashset to make sure that each hull is only included once
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HashSet<Hull> hulls = new HashSet<Hull>();
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foreach (Gap g in hull.ConnectedGaps)
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{
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if (!g.IsRoomToRoom || !g.PassAmbientLight || g.Open < 0.5f) continue;
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hulls.Add((g.linkedTo[0] == hull ? g.linkedTo[1] : g.linkedTo[0]) as Hull);
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}
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foreach (Hull h in hulls)
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{
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hullAmbientLight = AmbientLightHulls(h, hullAmbientLight, nextHullLight);
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}
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return hullAmbientLight;
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}
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public void DrawLightMap(SpriteBatch spriteBatch, Effect effect)
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{
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if (!LightingEnabled) return;
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spriteBatch.Begin(SpriteSortMode.Deferred, CustomBlendStates.Multiplicative, null, null, null, null);
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spriteBatch.Draw(lightMap, new Rectangle(0,0,GameMain.GraphicsWidth,GameMain.GraphicsHeight), Color.White);
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spriteBatch.End();
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}
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public void ClearLights()
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{
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lights.Clear();
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}
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}
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class CustomBlendStates
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{
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static CustomBlendStates()
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{
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Multiplicative = new BlendState();
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Multiplicative.ColorSourceBlend = Multiplicative.AlphaSourceBlend = Blend.Zero;
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Multiplicative.ColorDestinationBlend = Multiplicative.AlphaDestinationBlend = Blend.SourceColor;
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Multiplicative.ColorBlendFunction = Multiplicative.AlphaBlendFunction = BlendFunction.Add;
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WriteToAlpha = new BlendState();
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WriteToAlpha.ColorWriteChannels = ColorWriteChannels.Alpha;
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MultiplyWithAlpha = new BlendState();
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MultiplyWithAlpha.ColorDestinationBlend = MultiplyWithAlpha.AlphaDestinationBlend = Blend.One;
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MultiplyWithAlpha.ColorSourceBlend = MultiplyWithAlpha.AlphaSourceBlend = Blend.DestinationAlpha;
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}
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public static BlendState Multiplicative { get; private set; }
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public static BlendState WriteToAlpha { get; private set; }
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public static BlendState MultiplyWithAlpha { get; private set; }
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}
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}
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